Multi-direction fine tuning structure of laser module
Through the multi-directional fine-tuning structure of the flange fixing ring and the adjustment platform, the problem of laser beam projection angle deviation during the assembly of the laser projection instrument is solved, efficient and accurate laser module adjustment is achieved, and production efficiency and product quality are improved.
Patent Information
- Application Number
- CN202421979003.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-15
AI Technical Summary
During the assembly process, the existing laser line projection instruments have deviations in the projection angle of the laser beam due to tolerances, which requires time-consuming and labor-consuming calibration one by one, and are inefficient in production efficiency and are susceptible to human factors.
The multi-directional fine-tuning structure of the flange fixed ring, the first adjustment platform and the second adjustment platform is adopted. The multi-directional fine-tuning of the laser module is achieved through the bolt and rotary ring design, and the breathable seam and heat sink structure are combined to improve the adjustment convenience and accuracy.
High-precision multi-directional fine-tuning of the laser module is realized, reducing manual calibration time, improving production and assembly efficiency and product quality, and reducing maintenance and production costs.
Smart Images
Figure CN223065606U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of accessories for laser line projectors, and particularly to a multi-direction fine-tuning structure for a laser module. Background Art
[0002] A laser line projector is a modern measuring tool widely used in fields such as construction, decoration, and interior design. It forms one or more straight lines on the working surface by emitting laser beams to assist users in precise alignment and measurement. The main advantages of a laser line projector are its high precision, convenience, and versatility. It can not only project horizontal and vertical lines but also provide various modes such as cross lines and oblique lines to meet different measurement requirements.
[0003] The core component of a laser line projector is the laser module, which determines the projection quality and angle of the laser line. To ensure the accuracy of the laser line projector, the laser module must be strictly calibrated during factory assembly to ensure that the projection angle of the laser beam conforms to the construction standards. During the production process of the laser line projector, the calibration of the laser module is a key step. However, due to inevitable tolerances during the assembly process, the projection angle of the laser beam may deviate. This requires adjustment after assembly to ensure the accuracy of the laser line. To calibrate the projection angle of the laser beam, production personnel need to use precise calibration tools and methods to adjust each laser line projector. This is a time-consuming and laborious process because the tolerances of each laser module are different and need to be calibrated one by one. It is very time-consuming and easily affected by human factors, resulting in low production efficiency.
[0004] Therefore, the laser module calibration structure of the existing laser line projector needs to be further optimized and improved. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a multi-direction fine-tuning structure that is convenient to adjust and can complete the projection angle of the laser line of the laser module with only slight adjustment.
[0006] To achieve the above object, the present utility model adopts the following solution: A multi-direction fine-tuning structure of a laser module, comprising a flange fixing ring, a first adjustment platform and a second adjustment platform. The flange fixing ring is provided with a plurality of fixing screw holes penetrating therethrough, and is fixed to the pendulum body of the line projector by screws passing through the fixing screw holes. A connecting through hole is provided in the center of the flange fixing ring. The first adjustment platform and the second adjustment platform are sequentially and spaced apart above the flange fixing ring and are connected to each other through a connecting portion. The connecting portions are arranged in a cross shape. The centers of the first adjustment platform and the second adjustment platform are respectively penetrated with clamping through holes for inserting and fixing the laser module of the line projector. Adjusting portions are respectively provided on the first adjustment platform and the second adjustment platform, which can make the first adjustment platform and the second adjustment platform swing and turn around the connecting portion as the axis respectively, so as to cooperate with each other to realize multi-direction adjustment of the laser module. Through the fine-tuning function of the adjusting portion, the tolerance occurring in the assembly process can be effectively compensated, ensuring that the projection angle of the laser beam meets the standard. Through the fine-tuning functions of the first adjustment platform and the second adjustment platform, the angle of the laser line projected by the laser module can be quickly adjusted, reducing the manual calibration time and improving the overall production and assembly efficiency of the laser line projector. In addition, the gap structure between the first adjustment platform and the second adjustment platform naturally forms a ventilation slit, and the first adjustment platform and the second adjustment platform themselves can act as heat sinks, enabling the laser module to have a better heat dissipation effect.
[0007] As a preferred solution of the present utility model, the connecting portion includes a first connecting strip arranged between the flange fixing ring and the first adjustment platform and a second connecting strip arranged between the first adjustment platform and the second adjustment platform. The clamping through holes in the centers of the first adjustment platform and the second adjustment platform are respectively coaxial with the connecting through hole. The laser module is connected and fixed to the inner wall of the clamping through hole on the second adjustment platform. There is a gap between the clamping through hole on the first adjustment platform and the circumferential outer wall of the laser module. The first connecting strip and the second connecting strip are respectively arranged in a cross shape, and the intersection center point thereof is concentric with the axis of the clamping through hole. The adjusting portion on the first adjustment platform can make the first adjustment platform swing and turn to both sides around the connected first connecting strip as the axis, and the adjusting portion on the second adjustment platform can make the second adjustment platform swing and turn to both sides around the connected second connecting strip as the axis. Through the cross-shaped first connecting strip and second connecting strip, the stability of the entire structure of the first adjustment platform and the second adjustment platform is enhanced, avoiding the deviation occurring during the adjustment process, so that the laser module can realize multi-direction fine-tuning.
[0008] As a preferred solution of the utility model, the adjustment part includes adjustment screw holes symmetrically arranged on the first adjustment platform and the second adjustment platform, two symmetrical adjustment screw holes on the first adjustment platform are arranged crosswise with the first connecting strip, and two symmetrical adjustment screw holes on the second adjustment platform are arranged crosswise with the second connecting strip. Through holes are provided on the second adjustment platform at positions corresponding to the two adjustment screw holes on the first adjustment platform, and adjustment bolts are respectively threadedly penetrated in the adjustment screw holes, and the adjustment bolts on the first adjustment platform are respectively screwed into the corresponding adjustment screw holes through the through holes, and the bottom ends abut on the top surface of the flange fixing ring, and the adjustment bolts on the second adjustment platform are respectively screwed into the corresponding adjustment screw holes, and the bottom ends abut on the top surface of the first adjustment platform. Fine adjustments at the micron level can be made by adjusting the bolts to ensure the accuracy of the projection angle of the laser beam. In addition, the symmetrical adjustment bolts also provide additional support and fixation, making the adjustment platform more stable during the adjustment process, and the user can complete complex angle adjustments through simple bolt rotation operations, which improves the convenience of operation.
[0009] As a further solution of the utility model, an annular groove is provided on the circumferential inner wall surrounding the connecting through hole, a rotating ring that can rotate in the annular groove is embedded in the annular groove, the bottom end of the first connecting strip is movably abutted against the top surface of the flange fixing ring, and the first connecting strip is connected to the rotating ring through an extension extending downward. The design of the rotating ring allows the first adjustment platform and the second adjustment platform to rotate freely, increasing the flexibility of adjustment, and the adjustment bolts of the two-layer adjustment platform allow the laser module to be fine-tuned 360 degrees, with a simpler structure and reduced maintenance and production costs.
[0010] As a preferred solution of the utility model, the top of the annular groove extends upward to the top surface of the flange fixing ring, and a coaxial pressure ring is connected to the top of the top surface of the flange fixing ring. The inner periphery of the pressure ring covers the top surface of the annular groove, thereby restricting the rotating ring in the annular groove and preventing it from escaping. The design of the pressure ring ensures that the rotating ring will not detach from the annular groove, avoids the possible falling off of the rotating ring during use, and enhances the stability of the overall structure.
[0011] As a preferred solution of the utility model, the pressure ring is penetrated by a through hole connected to the fixing screw hole on the flange fixing ring, which facilitates the fixing of the pressure ring and facilitates disassembly and maintenance.
[0012] As a further solution of the utility model, a friction groove is provided along the bottom of the pressure ring, and a friction pattern is provided on the top of the rotating ring which can engage with the friction groove. Through the design of the friction groove and the friction pattern, the friction force of the rotating ring during the adjustment process is increased, the possible loosening of the rotating ring during the adjustment process is prevented, and the adjustment stability is ensured.
[0013] As a further solution of the utility model, scale lines are arranged at intervals along the circumferential outer wall of the pressure ring, and indicator marks are arranged on the circumferential outer wall of the flange fixing ring. The design of the scale lines and indicator marks allows the user to read the adjustment angle intuitively, improves the accuracy of the adjustment, facilitates the calibration process of the laser module, and reduces the adjustment time.
[0014] As a further solution of the utility model, recessed parts corresponding to the fixing screw holes on the flange fixing ring are respectively provided on the circumferential outer walls of the first adjustment platform and the second adjustment platform. The recessed parts can provide a clearance function, making it more convenient to fix the flange fixing ring on the pendulum body of the line casting instrument.
[0015] In summary, the utility model has the following beneficial effects compared with the prior art: the utility model forms a multi-directional fine-tuning structure scheme of the laser module through the flange fixing ring, the first adjustment platform, the second adjustment platform, the adjustment component composed of symmetrical bolts and the connecting part as the swing axis, so that the first adjustment platform and the second adjustment platform can be flipped and swung with the adjacent connecting strip as the axis. On the one hand, it can realize the high-precision multi-directional fine-tuning of the laser module, and then easily solve the problem of the error of the laser beam projection angle caused by the assembly tolerance. On the other hand, the gap structure between the first adjustment platform and the second adjustment platform naturally forms a breathable seam, and the first adjustment platform and the second adjustment platform themselves can act as a heat sink, so that the laser module has a better heat dissipation effect. The design of the rotating ring and the pressure ring increases the flexibility and range of adjustment, and cooperates with the swing fine-tuning of the first adjustment platform and the second adjustment platform, so that the laser module can achieve 360-degree fine-tuning, the structure is more concise, and the maintenance and production costs are reduced. The friction groove at the bottom of the pressure ring and the friction pattern at the top of the rotating ring are interlocked to enhance the friction during the adjustment process, ensuring the accuracy and stability of the adjustment. At the same time, the design of the scale pattern and the indicator mark makes the angle adjustment more intuitive and accurate. Through these optimized designs, the production and assembly efficiency and accuracy of the laser line projector are improved, the manual calibration time is reduced, and the overall quality of the product is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a three-dimensional schematic diagram of an embodiment of the utility model installed on a pendulum body.
[0017] Figure 2A three-dimensional schematic diagram when an embodiment of the present utility model is connected to the pendulum body.
[0018] Figure 3 One of the three-dimensional views of an embodiment of the present utility model.
[0019] Figure 4 Another three-dimensional view of an embodiment of the present utility model.
[0020] Figure 5 It is Figure 3 The sectional view taken along the cutting line A in the middle.
[0021] Figure 6 It is Figure 3 The sectional view taken along the cutting line B in the middle.
[0022] Figure 7 The three-dimensional view of another embodiment of the present utility model.
[0023] Figure 8 The sectional view of another embodiment of the present utility model.
[0024] Figure 9 It is Figure 8 The enlarged view at C in the middle.
[0025] Figure 10 One of the exploded views of another embodiment of the present utility model.
[0026] Figure 11 Another exploded view of another embodiment of the present utility model.
[0027] Explanation of reference numerals: 1. Flange fixing ring; 2. First adjustment platform; 3. Second adjustment platform; 4. Laser module; 5. Adjustment part; 6. Rotating ring; 7. Pressing ring; 8. Concave part; 9. Pendulum body; 10. Connecting part; 11. Connecting through hole; 12. Annular groove; 13. Fixed screw hole; 14. Indication mark; 21. First connecting strip; 22. Clamping through hole; 23. Extension part; 31. Second connecting strip; 51. Adjusting screw hole; 52. Through hole; 53. Adjusting bolt; 61. Friction pattern; 71. Perforation; 72. Friction groove; 73. Scale pattern. Detailed implementation manners
[0028] The following specific implementation contents provide various different embodiments or examples for implementing the present utility model. Of course, these are only embodiments or examples and are not intended to be restrictive. Additionally, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the present invention and do not represent a specific relationship between the different embodiments and / or structures discussed.
[0029] In addition, spatial-related terms may be used, such as "below", "lower side", "from inside to outside", "above", "upper side", and similar terms. These relational terms are for facilitating the description of the relationship between some elements or features and other elements or features in the drawings. These spatial relationship terms include different orientations of the device during use or operation, as well as the orientations described in the drawings. The device may be rotated 90 degrees or to other orientations, and the spatial-related adjectives used therein can be interpreted in the same way. Therefore, it should not be construed as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.
[0030] The following further describes the present utility model in conjunction with the accompanying drawing illustration and specific embodiments: As Figures 1 to 11 shown, a multi-directional fine-tuning structure of a laser module includes a flange fixing ring 1, a first adjustment platform 2, and a second adjustment platform 3. A plurality of fixing screw holes 13 are provided through the flange fixing ring 1, and are fixed to the pendulum body 9 of the alignment instrument by screws passing through the fixing screw holes 13. A connection through hole 11 is provided in the center of the flange fixing ring 1. The first adjustment platform 2 and the second adjustment platform 3 are sequentially and spaced apart above the flange fixing ring 1 and are connected to each other through a connecting portion 10. The connecting portions 10 are arranged in a cross shape. Clamping through holes 22 are respectively provided through the centers of the first adjustment platform 2 and the second adjustment platform 3 for inserting and fixing the laser module 4 of the alignment instrument. Depressions 8 corresponding to the fixing screw holes 13 on the flange fixing ring 1 are respectively provided on the circumferential outer walls of the first adjustment platform 2 and the second adjustment platform 3 to facilitate screwing screws into the fixing screw holes 13. Adjusting portions 5 are respectively provided on the first adjustment platform 2 and the second adjustment platform, enabling the first adjustment platform 2 and the second adjustment platform to respectively swing in a flipping manner with the connecting portion 10 as the axis, so as to cooperate with each other to achieve multi-directional adjustment of the laser module 4.
[0031] As Figures 1 to 6An embodiment of the present utility model is shown. Among them, the connecting portion 10 includes a first connecting strip 21 disposed between the flange fixing ring 1 and the first adjusting platform 2, and a second connecting strip 31 disposed between the first adjusting platform 2 and the second adjusting platform 3. The clamping through holes 22 at the centers of the first adjusting platform 2 and the second adjusting platform 3 are respectively coaxial with the connecting through hole 11. The laser module 4 is fixedly connected to the inner wall of the clamping through hole 22 on the second adjusting platform 3. There is a gap between the clamping through hole 22 on the first adjusting platform 2 and the circumferential outer wall of the laser module 4. The first connecting strip 21 and the second connecting strip 31 are respectively arranged in a cross shape, and the intersection center point thereof is concentric with the axis of the clamping through hole 22. The adjusting portion 5 on the first adjusting platform 2 can make the first adjusting platform 2 swing and turn to both sides with the connected first connecting strip 21 as the axis, and the adjusting portion 5 on the second adjusting platform 3 can make the second adjusting platform 3 swing and turn to both sides with the connected second connecting strip 31 as the axis. The adjusting portion 5 includes adjusting screw holes 51 symmetrically arranged on the first adjusting platform 2 and the second adjusting platform 3 respectively. The two symmetric adjusting screw holes 51 on the first adjusting platform 2 are arranged in a cross shape with the first connecting strip 21. The two symmetric adjusting screw holes 51 on the second adjusting platform 3 are arranged in a cross shape with the second connecting strip 31. Through holes 52 are provided through the positions corresponding to the two adjusting screw holes 51 on the first adjusting platform 2 on the second adjusting platform 3. Adjusting bolts 53 are respectively connected and passed through the adjusting screw holes 51 by threads. The adjusting bolts 53 on the first adjusting platform 2 respectively pass through the through holes 52 and are screwed into the corresponding adjusting screw holes 51, and the bottoms of these two adjusting bolts 53 abut against the top surface of the flange fixing ring 1. After the adjusting bolts 53 on the second adjusting platform 3 are respectively screwed into the corresponding adjusting screw holes 51, the bottoms of these two adjusting bolts 53 abut against the top surface of the first adjusting platform 2.
[0032] In addition, as Figures 7 to 11Another embodiment of the present utility model is shown. It can be clearly seen from the figure that this embodiment is basically the same as the first embodiment, except for the connection at the bottom end of the first connecting strip 21. Specifically: an annular groove 12 is provided on the circumferential inner wall of the connection through hole 11. A rotating ring 6 that can rotate within the annular groove 12 is embedded in the annular groove 12. The bottom end of the first connecting strip 21 is movably abutted against the top surface of the flange fixing ring 1, and the first connecting strip 21 is connected to the rotating ring 6 through an extending portion 23 that extends downward. In this embodiment, as an example, the extending portion 23 is formed by connecting a connecting column extending upward from the top of the rotating ring 6 to the bottom end of the first connecting strip 21. The top of the annular groove 12 extends upward to the top surface of the flange fixing ring 1. A coaxial pressing ring 7 is connected to the top of the top surface of the flange fixing ring 1. The inner periphery of the pressing ring 7 covers the top surface of the annular groove 12, thereby restricting the rotating ring 6 within the annular groove 12 and preventing it from detaching. To facilitate fixing the pressing ring 7 to the top surface of the flange fixing ring 1, a through hole 71 that communicates with the fixing screw hole 13 on the flange fixing ring 1 is provided through the pressing ring 7. When the flange fixing ring 1 needs to be installed on the pendulum body 9 of the line projector, a screw is inserted into the through hole 71 and passes through the fixing screw hole 13 and then is connected and fixed to a preset screw hole on the pendulum body 9 of the line projector. In this way, the pressing ring 7 and the flange fixing ring 1 can be fixed to each other. When it is necessary to adjust the projection angle of the laser module 4 by 360 degrees, by rotating the rotating ring 6 and coordinating with the left and right swings of the first adjustment platform 2 and the second adjustment platform respectively, multi-directional fine adjustment of 360 degrees can be achieved.
[0033] It should be noted that in order to prevent the rotating ring 6 from rotating again during use after the angle is adjusted, resulting in a deviation in the projection angle of the laser beam again, a friction groove 72 is provided along the bottom of the pressing ring 7, and a friction pattern 61 that can be engaged with the friction groove 72 is provided on the top of the rotating ring 6. Through the mutual friction between the friction groove 72 and the friction pattern 61, the friction force of the rotating ring 6 during the adjustment process is increased, preventing the loosening problem that may occur during and after the adjustment of the rotating ring 6 and ensuring the adjustment stability.
[0034] In order to improve the adjustment accuracy, facilitate the calibration process of the laser module 4, and reduce the calibration time, scale marks 73 are sequentially and spaced along the circumferential outer wall of the pressing ring 7, and an indication mark 14 is provided on the circumferential outer wall of the flange fixing ring 1. By using the scale marks 73 and the indication mark 14 in combination, the adjustment angle of the rotating ring 6 can be visually read during adjustment.
[0035] The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A multi-directional fine-tuning structure for a laser module, characterized in that, It includes a flange fixing ring (1), a first adjustment platform (2) and a second adjustment platform (3). A plurality of fixing screw holes (13) are provided through the flange fixing ring (1), and the pendulum body of the line projector is fixed by screws passing through the fixing screw holes (13). A connecting through hole (11) is provided in the center of the flange fixing ring (1). The first adjustment platform (2) and the second adjustment platform (3) are sequentially arranged at intervals above the flange fixing ring (1) and are connected to each other through a connecting part (10). The connecting parts (10) are arranged in a cross shape. The centers of the first adjustment platform (2) and the second adjustment platform (3) are respectively provided with clamping through holes (22) for inserting and fixing the laser module (4) of the line projector. Adjusting parts (5) are respectively provided on the first adjustment platform (2) and the second adjustment platform, enabling the first adjustment platform (2) and the second adjustment platform to swing and turn around the connecting part (10) as the axis respectively, so as to cooperate with each other to realize multi-directional adjustment of the laser module (4).
2. The multi-direction fine-tuning structure of a laser module according to claim 1, characterized in that The connecting part (10) includes a first connecting bar (21) arranged between the flange fixing ring (1) and the first adjustment platform (2) and a second connecting bar (31) arranged between the first adjustment platform (2) and the second adjustment platform (3). The clamping through holes (22) in the centers of the first adjustment platform (2) and the second adjustment platform (3) are respectively coaxial with the connecting through hole (11). The laser module (4) is fixedly connected to the inner wall of the clamping through hole (22) on the second adjustment platform (3). There is a gap between the clamping through hole (22) on the first adjustment platform (2) and the circumferential outer wall of the laser module (4). The first connecting bar (21) and the second connecting bar (31) are respectively arranged in a cross shape, and the intersection center point thereof is concentric with the axis of the clamping through hole (22). The adjusting part (5) on the first adjustment platform (2) can make the first adjustment platform (2) swing and turn to both sides around the connected first connecting bar (21) as the axis, and the adjusting part (5) on the second adjustment platform (3) can make the second adjustment platform (3) swing and turn to both sides around the connected second connecting bar (31) as the axis.
3. The multi-direction fine-tuning structure of a laser module according to claim 2, characterized in that, The adjusting part (5) includes adjusting screw holes (51) symmetrically arranged on the first adjusting platform (2) and the second adjusting platform (3) respectively. The two symmetric adjusting screw holes (51) on the first adjusting platform (2) are arranged in a cross shape with the first connecting bar (21). The two symmetric adjusting screw holes (51) on the second adjusting platform (3) are arranged in a cross shape with the second connecting bar (31). Through holes (52) are provided on the second adjusting platform (3) corresponding to the positions of the two adjusting screw holes (51) on the first adjusting platform (2). Adjusting bolts (53) are respectively screwed into the adjusting screw holes (51) through threads. The adjusting bolts (53) on the first adjusting platform (2) pass through the through holes (52) respectively and are screwed into the corresponding adjusting screw holes (51), and the bottom ends abut against the top surface of the flange fixing ring (1). The adjusting bolts (53) on the second adjusting platform (3) are respectively screwed into the corresponding adjusting screw holes (51), and the bottom ends abut against the top surface of the first adjusting platform (2).
4. The multi-directional fine-tuning structure of a laser module according to claim 3, characterized in that, An annular groove (12) is provided on the circumferential inner wall surrounding the connecting through hole (11). A rotating ring (6) that can rotate in the annular groove (12) is embedded in the annular groove (12). The bottom end of the first connecting bar (21) abuts against the top surface of the flange fixing ring (1) movably, and the first connecting bar (21) is connected to the rotating ring (6) through an extending part (23) extending downward.
5. The multi-directional fine-tuning structure of a laser module according to claim 4, characterized in that, The top of the annular groove (12) extends upward to the top surface of the flange fixing ring (1). A coaxial pressing ring (7) is connected to the top of the top surface of the flange fixing ring (1). The inner periphery of the pressing ring (7) covers the top surface of the annular groove (12), thereby restricting the rotating ring (6) in the annular groove (12) and preventing it from detaching.
6. The multi-direction fine-tuning structure of a laser module according to claim 5, characterized in that, A through hole (71) communicating with the fixing screw hole (13) on the flange fixing ring (1) is provided through the pressing ring (7).
7. The multi-directional fine-tuning structure of a laser module according to claim 6, wherein, A friction groove (72) is provided along the bottom of the pressing ring (7). Friction lines (61) that can be engaged with the friction groove (72) are provided on the top of the rotating ring (6).
8. The multi-directional fine-tuning structure of a laser module according to claim 5, characterized in that, Scale lines (73) are sequentially arranged at intervals along the circumferential outer wall of the pressing ring (7). An indicating mark (14) is provided on the circumferential outer wall of the flange fixing ring (1).
9. The multi-directional fine-tuning structure of a laser module according to claim 1, wherein, Depressions (8) corresponding to the fixing screw holes (13) on the flange fixing ring (1) are respectively provided on the circumferential outer walls of the first adjusting platform (2) and the second adjusting platform (3).