Base backrest positioning marking device and positioning marking method

Abstract

This invention relates to the field of shipbuilding technology, specifically disclosing a base backrest positioning and marking device and method. The device includes a positioning and marking assembly and a height measuring assembly. The positioning and marking assembly includes a fixed plate and a clamping plate. The fixed plate is rotatably connected to the clamping plate via a pin, the axis of which is parallel to the ground. A spirit level is fixedly installed on the fixed plate for adjusting its levelness. A rotating shaft is rotatably connected to the fixed plate, its axis being vertical to the fixed plate. A light-emitting unit is detachably connected to the rotating shaft, emitting light parallel to the fixed plate. The height measuring assembly includes a telescopic scale rod, which is vertically positioned to the ground and can extend and retract in the direction perpendicular to the ground. The clamping plate detachably clamps the outer wall of the telescopic scale rod. The telescopic scale rod has graduations used to indicate the position of the light-emitting unit relative to the ground. This device solves the problem of low positioning and marking accuracy.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a base backrest positioning and marking device and method. Background Technology

[0002] Combined horizontal bases (including backrests and bases) and bulkhead bases are commonly used in shipbuilding. The base of the horizontal base is installed on the deck surface, and the backrest is installed on the bulkhead. Currently, the positioning of the base backrest still requires construction personnel to first measure the backrest height using a tape measure, and then use a spirit level to mark the positioning lines, based on the horizontal plane of the base or the deck surface. During the measurement process, the tape measure is prone to bending, requiring the construction personnel to verify and calibrate the measured data. Furthermore, the accuracy of the measurement is directly related to the construction personnel's operational process; the marking and positioning can easily deviate due to deformation of the hull structure, making it difficult to meet the design requirements for the installation accuracy of the base backrest.

[0003] Therefore, in order to solve the above problems, there is an urgent need for a device for positioning and marking the back of the base to improve construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a base backrest positioning marking device and a positioning marking method to solve the problem of low positioning marking accuracy of the base backrest.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A base backrest positioning and marking device includes a positioning and marking assembly and a height measuring assembly. The positioning and marking assembly includes a fixed plate and a clamping plate. The fixed plate is rotatably connected to the clamping plate via a pin, the axis of which is parallel to the ground. A spirit level is fixedly installed on the fixed plate for adjusting its levelness. A rotating shaft is rotatably connected to the fixed plate, the axis of which is vertical to the fixed plate. A light-emitting unit is detachably connected to the rotating shaft, and the light emitted by the light-emitting unit is parallel to the fixed plate. The height measuring assembly includes a telescopic scale rod, which is vertically positioned to the ground and can extend and retract in a direction perpendicular to the ground. The clamping plate detachably clamps the outer wall of the telescopic scale rod. The telescopic scale rod has graduations used to indicate the position of the light-emitting unit relative to the ground.

[0007] As a preferred technical solution for the base backrest positioning marking device, the clamping plate includes a clamp and a limiting device. The clamp includes a main body and a clamping part that are fixedly connected. The limiting device is slidably installed on the main body and can be close to or away from the clamping part. The telescopic scale rod can be clamped between the clamping part and the limiting device.

[0008] As a preferred technical solution for the base backrest positioning marking device, the outer surface of the clamping part has a first surface, the outer surface of the limiting device has a second surface, the first surface and the second surface are directly opposite each other, the first surface is recessed with a V-shaped groove, and the second surface is opened with a V-shaped bevel.

[0009] As a preferred technical solution for the base backrest positioning marking device, the clamping plate further includes a limiting bolt screwed to the main body, and the outer surface of the limiting device has a third surface opposite to the second surface, with the screw of the limiting bolt pressing against the third surface.

[0010] As a preferred technical solution for the base backrest positioning marking device, a leveling component that can reciprocate in the vertical direction is movably installed on the clamping plate, and the top of the leveling component abuts against the bottom of the fixing plate.

[0011] As a preferred technical solution for the base backrest positioning marking device, the leveling component includes a leveling bolt, which is screwed onto the clamping plate. The length direction of the leveling bolt is perpendicular to the clamping plate, and the screw of the leveling bolt abuts against the fixing plate.

[0012] As a preferred technical solution for the base backrest positioning marking device, a locking ring is fixedly connected to the rotating shaft, the light-emitting unit is detachably connected to the locking ring, the axis of the locking ring is parallel to the fixed plate, and a number of locking bolts are screwed onto the locking ring, the screw of the locking bolts can press against the outer surface of the light-emitting unit.

[0013] As a preferred technical solution for the base backrest positioning marking device, the height measuring component further includes a base component, a positioning screw is fixedly provided at the bottom end of the telescopic scale rod, a screw groove is recessed at the top end of the base component, the positioning screw is locked in the screw groove, and the length direction of the positioning screw and the length direction of the screw groove are both vertical to the ground.

[0014] As a preferred technical solution for the base backrest positioning marking device, the light emitted by the light-emitting unit is a laser, and the light-emitting unit includes a laser pen.

[0015] The base backrest positioning marking method, applied to the aforementioned base backrest positioning marking device, includes the following steps:

[0016] S10: Place the height measuring component on the ground and install the positioning marking component on the telescopic scale rod;

[0017] S20: Adjust the relative position of the fixing plate and the clamping plate according to the bubble level until the bubble level is parallel to the ground;

[0018] S30: Turn on the light-emitting unit and align the light emitted by the light-emitting unit with the scale value;

[0019] S40: Pull or zoom the telescopic scale bar according to the positioning information so that the scale display range meets the requirements of the positioning information;

[0020] S50: Adjust the relative position of the clamping plate and the telescopic scale rod until the scale indicated by the light emitted by the light-emitting unit is the same as the scale of the positioning information, and use the clamping plate to clamp the outer wall of the telescopic scale rod;

[0021] S60: Rotate the rotating shaft so that the light emitted by the light-emitting unit illuminates the base backrest to complete the positioning and marking action;

[0022] S70: Retract the telescopic scale rod and remove the positioning marking assembly from the height measuring assembly.

[0023] The beneficial effects of this invention are:

[0024] This base backrest positioning and marking device utilizes a separate design for the positioning and marking assembly and the height measuring assembly, reducing the processing difficulty and production cost of these components. The design of the clamping plate rotatably connecting to the fixed plate, in conjunction with the bubble level, allows for adjustment of the fixed plate's levelness by changing the relative positions of the two plates, ensuring the fixed plate is parallel to the ground. The rotating shaft allows the light emitted by the detachably connected light-emitting unit to rotate horizontally, confirming its position relative to the ground after the light-emitting unit reads the scale on the telescopic scale rod. Positioning lines are then drawn on the base backrest at the same height, completing the positioning and marking operation. The detachable clamping of the clamping plate onto the outer wall of the telescopic scale rod allows for relative position adjustment between the clamping plate and the telescopic scale rod, reducing the difficulty of adjusting the relative positions of the positioning and marking assembly and the height measuring assembly, improving the working efficiency of the base backrest positioning and marking device, and making the telescopic scale rod easy to store and carry. Furthermore, the telescopic design of the telescopic scale rod allows operators to extend or retract it after locating the corresponding position. This design significantly reduces the difficulty of positioning the positioning scribing component on the telescopic scale rod, ensuring its accuracy and greatly accelerating the positioning scribing operation. This design solves the problem of low precision in positioning scribing operations on base backrests, and is particularly effective for horizontal base backrests installed on complex curved wall panels.

[0025] This base backrest positioning and marking method simplifies the operation process, optimizes the steps, reduces the difficulty, decreases the workload of operators, ensures the efficiency of positioning and marking, and solves the problem of low positioning and marking accuracy. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the base backrest positioning marking device provided in an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Cross-sectional view of plane AA in the middle.

[0028] In the picture:

[0029] 1. Magnetic base; 2. Telescopic scale rod; 3. Pin; 4. Clamp; 5. Limiting device; 51. Limiting bolt; 6. Fixing plate; 61. Level bubble; 7. Leveling component; 8. Light-emitting unit; 9. Locking ring; 91. Locking bolt; 92. Rotating shaft. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this invention, it should be noted that, 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 based on the specific circumstances.

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a base backrest positioning marking device, including a positioning marking assembly and a height measuring assembly. The positioning marking assembly includes a fixed plate 6 and a clamping plate. The fixed plate 6 is rotatably connected to the clamping plate via a pin 3. The axis of the pin 3 is parallel to the ground. A spirit level 61 is fixedly installed on the fixed plate 6. The spirit level 61 is used to adjust the levelness of the fixed plate 6. A rotating shaft 92 is rotatably connected to the fixed plate 6. The axis of the rotating shaft 92 is vertical to the fixed plate 6. A light-emitting unit 8 is detachably connected to the rotating shaft 92. The light emitted by the light-emitting unit 8 is parallel to the fixed plate 6. The height measuring assembly includes a telescopic scale rod 2. The telescopic scale rod 2 is set vertically to the ground and can extend and retract in the direction vertical to the ground. The clamping plate can detachably clamp the outer wall of the telescopic scale rod 2. The telescopic scale rod 2 is provided with scale values, which are used to mark the position of the light-emitting unit 8 relative to the ground.

[0035] In this embodiment, the ground is made of a steel base or deck, and the light-emitting unit 8 is used to perform positioning and marking operations on the back of the base.

[0036] This base backrest positioning and marking device utilizes a separate design for the positioning and marking assembly and the height measuring assembly, reducing the processing difficulty and production cost of these components. The design of the clamping plate rotatably connected to the fixed plate 6, in conjunction with the level bubble 61, allows adjustment of the relative position of the fixed plate 6 and the clamping plate, ensuring the fixed plate 6 is parallel to the ground. The rotating shaft 92 allows the light emitted by the detachably connected light-emitting unit 8 to rotate horizontally, enabling the light-emitting unit 8 to read the scale on the telescopic scale rod 2 and confirm its position relative to the ground. Positioning lines are then drawn on the base backrest at the same height, completing the positioning and marking operation. By using a clamping plate to detachably clamp the outer wall of the telescopic scale rod 2, the relative position of the clamping plate and the telescopic scale rod 2 can be adjusted. This reduces the difficulty of adjusting the relative position between the positioning and marking components and the height measuring components, improves the working efficiency of the base backrest positioning and marking device, and also makes the telescopic scale rod 2 easy to store and carry. Furthermore, the telescopic design of the telescopic scale rod 2 allows operators to locate the corresponding position before extending or retracting it. These designs significantly reduce the difficulty of positioning the positioning and marking components on the telescopic scale rod 2, ensuring the accuracy of positioning and marking on the telescopic scale rod 2, and greatly accelerating the positioning and marking operation. This design solves the problem of low accuracy in base backrest positioning and marking operations, and is particularly effective for horizontal base backrests installed on complex curved wall panels.

[0037] This base backrest positioning and marking device integrates the functions of various tools currently used in construction, encompassing components such as a measuring tape, spirit level, and marking pen. Its simple and reliable structure allows for stable placement on the ground, enabling horizontal base backrest positioning and marking. It particularly improves the accuracy of horizontal base backrest marking when installed on difficult-to-correct cabin wall panels or curved wall panels, providing strong support for subsequent base installation and even equipment installation. This base backrest positioning and marking device is easy to operate, offering features such as immediate use upon installation, easy storage, and portability. It provides high accuracy in positioning and marking operations, making it convenient for construction personnel.

[0038] In this embodiment, the clamping plate includes a clamp 4 and a limiting device 5. The clamp 4 includes a main body and a clamping part that are fixedly connected to each other. The limiting device 5 is slidably mounted on the main body and can move closer to or further away from the clamping part. The telescopic scale rod 2 can be clamped between the clamping part and the limiting device 5. By moving the clamping part and the limiting device 5 towards or away from each other, the outer wall of the telescopic scale rod 2 can be clamped from both sides, thereby realizing the detachable clamping operation of the clamping plate on the outer wall of the telescopic scale rod 2. The above structural design is simple and reliable, with strong structural stability and high positioning stability, which helps to determine the distance between the fixed plate 6 and the ground and improves the accuracy of the positioning and marking operation.

[0039] Furthermore, the outer surface of the clamping part has a first surface, and the outer surface of the limiting device 5 has a second surface. The first surface and the second surface are directly opposite each other. The first surface is recessed with a V-shaped groove, and the second surface is opened with a V-shaped bevel.

[0040] The V-groove and V-bevel design increase the contact area between the telescopic scale rod 2 and the clamping part and the limiting device 5, achieving the purpose of limiting the telescopic scale rod 2, reducing the risk of relative positional displacement of the telescopic scale rod 2 due to accidents, ensuring the positioning effect of the positioning scribing assembly on the telescopic scale rod 2, ensuring the connection stability of the clamping plate on the telescopic scale rod 2, improving the positioning efficiency of the positioning scribing assembly and the accuracy of the base backrest positioning scribing operation.

[0041] Furthermore, the clamping plate also includes a limiting bolt 51 screwed to the main body. The outer surface of the limiting device 5 has a third surface opposite to the second surface, and the screw of the limiting bolt 51 presses against the third surface. The limiting bolt 51 serves to drive the limiting device 5 and also prevents the limiting device 5 from moving away from the clamping part by pushing the limiting device 5. This design reduces the possibility of the clamping plate accidentally loosening the telescopic scale rod 2, while also improving the efficiency of locking the clamping plate on the telescopic scale rod 2, ensuring that the detachable clamping of the clamping plate on the telescopic scale rod 2 can be successfully completed. The limiting bolt 51 pressing against the third surface optimizes the structural layout of the limiting bolt 51, the limiting device 5, the main body, and the clamping part, reducing the production cost of the clamping plate and lowering the manufacturing difficulty of the clamping plate.

[0042] In this embodiment, a leveling component 7, capable of reciprocating vertically, is movably mounted on the clamping plate, with its top end abutting against the bottom of the fixing plate 6. By lifting the fixing plate 6, the leveling component 7 can adjust the relative position of the fixing plate 6 and the clamping plate, while also preventing the fixing plate 6 from shifting relative to the clamping plate due to its own weight. This structure is simple, reliable, easy to adjust, and highly stable, helping to reduce the difficulty of positioning and marking operations and improve their efficiency.

[0043] Furthermore, the leveling component 7 includes a leveling bolt, which is screwed onto the clamping plate. The length direction of the leveling bolt is vertical to the clamping plate, and the thread of the leveling bolt abuts against the fixing plate 6. The leveling bolt has a simple and reliable structure, high positioning stability, and is not prone to positional deviation. It can accurately achieve the purpose of lifting the fixing plate 6. At the same time, the leveling bolt has low production cost, occupies little space, and is easy to fit, which helps to reduce the production cost of the positioning and marking assembly, improve the efficiency of position adjustment of the fixing plate 6, and thus speed up the positioning and marking operation.

[0044] In this embodiment, a locking ring 9 is fixedly connected to the rotating shaft 92. The light-emitting unit 8 is detachably connected to the locking ring 9. The axis of the locking ring 9 is parallel to the fixing plate 6. Several locking bolts 91 are screwed onto the locking ring 9, and the screws of the locking bolts 91 can press against the outer surface of the light-emitting unit 8. With the structural cooperation of the locking ring 9, locking bolts 91 and light-emitting unit 8, the light-emitting unit 8 can be detachably installed on the rotating shaft 92. The locking ring 9 ensures that the light emitted by the light-emitting unit 8 installed on the rotating shaft 92 is always parallel to the fixing plate 6, ensuring the accuracy of the subsequent positioning and marking operations. The locking bolts 91 allow the light-emitting unit 8 to be detachably locked to the locking ring 9, ensuring the flexibility of the fixing plate 6 structure and improving the efficiency of replacing and maintaining the light-emitting unit 8.

[0045] For example, the height measuring component also includes a base component. A positioning screw is fixed to the bottom end of the telescopic scale rod 2, and a screw groove is recessed at the top of the base component. The positioning screw is locked into the screw groove, and both the length direction of the positioning screw and the length direction of the screw groove are vertical to the ground. With the base component, this design ensures that the telescopic scale rod 2 can be set vertically to the ground, avoiding inaccurate positioning and marking results due to positional deviation of the height measuring component. Furthermore, the separate design of the base component and the telescopic scale rod 2 reduces the processing difficulty of the height measuring component, reduces the space occupied by the height measuring component, facilitates the organization and arrangement of various components on the base backrest positioning and marking device, and expands the application scenarios of the base backrest positioning and marking device.

[0046] Specifically, the base component is a magnetic base 1. Considering that the ground is a steel base or deck, the bottom of the magnetic base 1 is magnetically attached to the ground. This design improves the positioning stability of the base component on the ground, further reduces the risk of positional deviation of the height measuring component due to accidents, and further improves the accuracy of the positioning and marking operation results.

[0047] In this embodiment, the light emitted by the light-emitting unit 8 is a laser, and the light-emitting unit 8 includes a laser pointer. Using a laser for positioning and marking operations can smoothly obtain clear and obvious imprints, thereby ensuring that the positioning and marking operations can be completed accurately and greatly reducing the probability of rework.

[0048] Specifically, the light-emitting unit 8 can emit both indicator light and working light, with overlapping light paths but different illumination intensities. When illuminating the telescopic scale rod 2, the light-emitting unit 8 emits the indicator light; when illuminating the base backrest, the light-emitting unit 8 emits the working light. This design avoids irreversible damage to the telescopic scale rod 2 caused by the light-emitting unit 8 illuminating it, reduces the risk of damage to the height measurement component, and extends the service life of the base backrest positioning marking device.

[0049] This embodiment also provides a base backrest positioning marking method, applied to the aforementioned base backrest positioning marking device, including the following steps:

[0050] Step 1: Place the height measuring component on the ground and install the positioning marking component on the telescopic scale rod 2.

[0051] Step 2: Adjust the relative position of the fixing plate 6 and the clamping plate according to the level bubble 61 until the level bubble 61 is parallel to the ground.

[0052] Step 3: Turn on the light-emitting unit 8 and align the light emitted by the light-emitting unit 8 with the scale value.

[0053] Step 4: Adjust the scale bar 2 by pulling or scaling it according to the positioning information so that the scale display range meets the requirements of the positioning information.

[0054] Step 5: Adjust the relative position of the clamping plate and the telescopic scale rod 2 until the scale indicated by the light emitted by the light-emitting unit 8 is the same as the scale of the positioning information, and use the clamping plate to clamp the outer wall of the telescopic scale rod 2.

[0055] Step 6: Rotate the rotating shaft 92 so that the light emitted by the light-emitting unit 8 illuminates the back of the base to complete the positioning and marking action.

[0056] Step 7: Retract the telescopic scale rod 2 and remove the positioning marking assembly from the height measuring assembly.

[0057] Specifically, the positioning information is the drawing positioning information, and the components of the disassembled base backrest positioning marking device are stored in a soft-pack toolbox.

[0058] This base backrest positioning and marking method simplifies the operation process, optimizes the steps, reduces the difficulty, decreases the workload of operators, ensures the efficiency of positioning and marking, and solves the problem of low positioning and marking accuracy.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for marking positioning lines on a base backrest, characterized in that, An application for a base backrest positioning and marking device, the base backrest positioning and marking device comprising: The positioning and marking assembly includes a fixed plate (6) and a clamping plate. The fixed plate (6) is rotatably connected to the clamping plate via a pin (3). The axis of the pin (3) is parallel to the ground. A spirit level (61) is fixedly installed on the fixed plate (6). The spirit level (61) is used to adjust the levelness of the fixed plate (6). A rotating shaft (92) is rotatably connected to the fixed plate (6). The axis of the rotating shaft (92) is vertical to the fixed plate (6). A light-emitting unit (8) is detachably connected to the rotating shaft (92). The light emitted by the light-emitting unit (8) is parallel to the fixed plate (6). The height measuring component includes a telescopic scale rod (2), which is set vertically to the ground and can extend and retract in the direction vertical to the ground. The clamping plate can detachably clamp the outer wall of the telescopic scale rod (2). The telescopic scale rod (2) is provided with scale values, which are used to mark the position of the light-emitting unit (8) relative to the ground. The light emitted by the light-emitting unit (8) can rotate in the horizontal plane, so that after the light-emitting unit (8) reads the scale on the telescopic scale rod (2), the position of the light-emitting unit (8) relative to the ground can be confirmed, and the positioning line can be drawn on the back of the base at the same height. The method for positioning and marking the base backrest includes the following steps: S10: Place the height measuring component on the ground and install the positioning marking component on the telescopic scale rod (2); S20: Adjust the relative position of the fixing plate (6) and the clamping plate according to the level bubble (61) until the fixing plate (6) is parallel to the ground; S30: Turn on the light-emitting unit (8) and align the light emitted by the light-emitting unit (8) with the scale value; S40: Pull or zoom the telescopic scale bar (2) according to the positioning information so that the scale display range meets the requirements of the positioning information; S50: Adjust the relative position of the clamping plate and the telescopic scale rod (2) until the scale indicated by the light emitted by the light-emitting unit (8) is the same as the scale of the positioning information, and use the clamping plate to clamp the outer wall of the telescopic scale rod (2); S60: Rotate the rotating shaft (92) so that the light emitted by the light-emitting unit (8) illuminates the base backrest to complete the positioning and marking action; S70: Retract the telescopic scale rod (2) and remove the positioning marking assembly from the height measuring assembly.

2. The base backrest positioning marking method according to claim 1, characterized in that, The clamping plate includes a clamp (4) and a limiting device (5). The clamp (4) includes a main body and a clamping part that are fixedly connected. The limiting device (5) is slidably installed on the main body and can be close to or away from the clamping part. The telescopic scale rod (2) can be clamped between the clamping part and the limiting device (5).

3. The base backrest positioning marking method according to claim 2, characterized in that, The outer surface of the clamping part has a first surface, and the outer surface of the limiting device (5) has a second surface. The first surface and the second surface are directly opposite each other. The first surface is recessed with a V-shaped groove, and the second surface is opened with a V-shaped bevel.

4. The base backrest positioning marking method according to claim 3, characterized in that, The clamping plate also includes a limiting bolt (51) screwed to the main body. The outer surface of the limiting device (5) has a third surface opposite to the second surface, and the screw of the limiting bolt (51) presses against the third surface.

5. The base backrest positioning marking method according to claim 1, characterized in that, A leveling component (7) capable of reciprocating in the vertical direction is movably mounted on the clamping plate, with the top of the leveling component (7) abutting against the bottom of the fixing plate (6).

6. The base backrest positioning marking method according to claim 5, characterized in that, The leveling component (7) includes a leveling bolt, which is screwed to the clamping plate. The length direction of the leveling bolt is perpendicular to the clamping plate, and the screw of the leveling bolt abuts against the fixing plate (6).

7. The base backrest positioning marking method according to claim 1, characterized in that, A locking ring (9) is fixedly connected to the rotating shaft (92). The light-emitting unit (8) is detachably connected to the locking ring (9). The axis of the locking ring (9) is parallel to the fixing plate (6). Several locking bolts (91) are screwed onto the locking ring (9). The screw of the locking bolt (91) can press against the outer surface of the light-emitting unit (8).

8. The base backrest positioning marking method according to claim 1, characterized in that, The height measuring component also includes a base component, the bottom end of the telescopic scale rod (2) is fixed with a positioning screw, the top end of the base component is recessed with a screw groove, the positioning screw is locked in the screw groove, and the length direction of the positioning screw and the length direction of the screw groove are both vertical to the ground.

9. The base backrest positioning marking method according to any one of claims 1-8, characterized in that, The light emitted by the light-emitting unit (8) is a laser, and the light-emitting unit (8) includes a laser pointer.

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