Rear frame auxiliary installation device

Abstract

This invention relates to the field of engineering machinery and discloses a rear frame auxiliary installation device, including a base frame and a cross-shaped laser emitting assembly. The base frame is positioned on the counterweight mounting surface at the rear end of the upper frame. The cross-shaped laser emitting assembly is mounted on the base frame and emits cross-shaped laser lines to the installation positions on the top beam and the two side columns of the rear frame, with the vertical lines of the cross-shaped laser lines perpendicular to the counterweight mounting surface. This invention improves the positioning accuracy of the rear frame installation, simplifies the installation operation, and is convenient, time-saving, and labor-saving.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery, and specifically relates to a rear frame auxiliary installation device. Background Technology

[0002] Currently, during the assembly process of excavators, when assembling the rear frame to the rear end of the upper frame, it is generally done manually using tools such as a right-angle ruler to measure and position the top beam and the two side columns of the rear frame. This requires multiple measurements and calculations, making the operation cumbersome, time-consuming, and labor-intensive. Furthermore, the positioning benchmarks are not uniform, which can easily lead to large errors and poor positioning accuracy. After assembly, rework or repairs are often required, greatly increasing production costs. Summary of the Invention

[0003] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a rear frame auxiliary installation device, which can improve the positioning accuracy of the rear frame installation, simplify the installation operation, and is easy to operate, saving time and effort.

[0004] To achieve the above objectives, the present invention provides a rear frame auxiliary installation device, comprising:

[0005] The underframe is used for positioning on the counterweight mounting surface at the rear end of the upper frame; and

[0006] A cross-shaped laser emitting assembly is mounted on the base frame and is capable of emitting cross-shaped laser lines to the installation positions of the top beam of the rear frame and the columns on both sides, with the vertical line of the cross-shaped laser line perpendicular to the counterweight mounting surface.

[0007] Optionally, the cross-shaped laser emitting assembly includes:

[0008] A swing arm, one end of which is rotatably connected to the base frame, is rotatable between a first position, a second position, and a third position. In the first position, the swing arm is perpendicular to the counterweight mounting surface; in the second position, the swing arm is parallel to the counterweight mounting surface and extends along one side of the lateral direction of the upper frame; and in the third position, the swing arm is parallel to the counterweight mounting surface and extends along the other side of the lateral direction of the upper frame.

[0009] A first cross laser emitter is mounted on the swing arm and is used to emit the cross laser line.

[0010] Optionally, the cross laser emitting assembly further includes a first slide rail and a first scale. The first slide rail is fixedly mounted on the swing arm and its length direction is consistent with the length direction of the swing arm. The first cross laser emitter is slidably connected to the first slide rail, and the first scale is mounted on the first slide rail and its extension direction is consistent with the first slide rail.

[0011] Optionally, the base frame is provided with a first limiting structure, a second limiting structure and a third limiting structure. The first limiting structure is configured to restrict the swing arm in the first position from rotating toward the second position or the third position. The second limiting structure is configured to restrict the swing arm in the second position from rotating downward. The third limiting structure is configured to restrict the swing arm in the third position from rotating downward.

[0012] Optionally, the base frame is provided with a bracket, and the first limiting structure includes two limiting rods, which are supported on the bracket and used to abut against the two sides of the swing arm in the first position.

[0013] Optionally, the second limiting structure includes a first limiting pad, which is disposed at the first end of the base frame in the lateral direction of the upper frame and is used to abut against the bottom surface of the swing arm in the second position.

[0014] Optionally, the third limiting structure includes a second limiting pad, which is disposed at the second end of the base frame in the lateral direction of the upper frame and is used to abut against the bottom surface of the swing arm in the third position.

[0015] Optionally, the base frame includes:

[0016] The base is provided with a positioning hole, which can be aligned and connected with the counterweight mounting hole on the counterweight mounting surface by a positioning pin.

[0017] Two crossbars are provided on the base and extend laterally along the upper frame;

[0018] One end of the swing arm is provided with a pivot, which is located between the two crossbars and is rotatably connected to the two crossbars at both ends.

[0019] Optionally, the cross-shaped laser emitting assembly includes:

[0020] A support frame is fixedly mounted on the base frame and extends in a direction perpendicular to the counterweight mounting surface. The top of the support frame is provided with an insertion interface.

[0021] A second cross-shaped laser emitter is disposed on the front side of the support frame; and

[0022] The reflective component includes a connecting rod, a reflective arm, a first reflector, and a second reflector. The connecting rod and the reflective arm are connected in a cross shape. Both ends of the connecting rod can be detachably inserted into the interface of the support frame. The reflective arm extends laterally along the upper frame. The first end of the reflective arm has a support arm extending in front of the second cross laser emitter. The first reflector is disposed at the end of the support arm and is correspondingly disposed to the second cross laser emitter. The second reflector is disposed at the second end of the reflective arm and is correspondingly disposed to the first reflector.

[0023] Optionally, the cross-shaped laser emitting assembly further includes:

[0024] The second slide rail and the second scale are fixedly mounted on the front side of the support frame and extend along the extension direction of the support frame. The second cross laser emitter is slidably connected to the second slide rail. The second scale is mounted on the second slide rail and extends in the same direction as the second slide rail.

[0025] The third slide rail and the third scale are provided. The third slide rail is fixedly disposed at the second end of the reflector arm and extends along the extension direction of the reflector arm. The second reflector is slidably connected to the third slide rail via a sliding seat. The third scale is disposed on the third slide rail and extends in the same direction as the third slide rail.

[0026] In the rear frame auxiliary installation device provided by this invention, the cross laser emitting component can emit cross laser lines to the installation positions of the top beam and the two side columns of the rear frame. With this configuration, during the assembly of the rear frame onto the upper frame, the top beam and the two side columns of the rear frame can be positioned and installed based on the emitted cross laser lines, eliminating the need for multiple measurements and calculations. This is easy to operate, saves time and effort, and effectively reduces errors caused by human operation. Moreover, the vertical line of the cross laser line is perpendicular to the counterweight mounting surface, so that the positioning of the top beam and the two side columns of the rear frame is based on the counterweight mounting surface. Using the same positioning reference can eliminate positioning errors and conversion errors caused by different references, further improving the accuracy of rear frame positioning. This effectively avoids situations where rework or repair is required after assembly, which would greatly increase production costs.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the rear frame auxiliary installation device used for rear frame positioning and installation in one embodiment of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the rear frame auxiliary installation device;

[0031] Figure 3 This is a schematic diagram of the structure of the rear frame auxiliary installation device used for rear frame positioning and installation in another embodiment of the present invention;

[0032] Figure 4 for Figure 3 A schematic diagram of the structure of the rear frame auxiliary installation device.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Base frame

[0035] 11. Base 12. Crossbar

[0036] 2 Cross-shaped laser emission assembly

[0037] 21 Swing arm 22 First cross laser emitter

[0038] 23 First slide rail 24 Support frame

[0039] 25 Second Cross Laser Emitter 26 Reflecting Component

[0040] 261 Connecting rod 262 Reflecting arm

[0041] 263 First reflecting mirror 264 Second reflecting mirror

[0042] 27 Second slide rail 28 Third slide rail

[0043] 3 First limiting structure

[0044] 4 Second limiting structure

[0045] 5 Third limiting structure

[0046] 6. Upper frame

[0047] 61 Counterweight mounting surface

[0048] 7. Back frame

[0049] 71. Top beam; 72. Column Detailed Implementation

[0050] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0052] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positions of components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] The present invention first provides a rear frame auxiliary installation device.

[0055] In one implementation, refer to the appendix. Figure 1 To be continued Figure 4 As shown, the rear frame auxiliary installation device includes a base frame 1 and a cross laser emitting assembly 2. The base frame 1 is used to position itself on the counterweight mounting surface 61 at the rear end of the upper frame 6. The cross laser emitting assembly 2 is mounted on the base frame 1 and can emit cross laser lines to the installation positions of the top beam 71 and the uprights 72 on both sides of the rear frame 7, respectively, and the vertical line of the cross laser line is perpendicular to the counterweight mounting surface 61.

[0056] Understandably, when the upper frame 6 is in a flat state, the counterweight mounting surface 61 is a horizontal plane. Therefore, by using the counterweight mounting surface 61 as a reference surface to position the top beam 71 of the rear frame 7 and the uprights 72 on both sides, the horizontality and verticality of the top beam 71 and the uprights 72 on both sides of the rear frame 7 can be guaranteed.

[0057] In this embodiment, the cross laser emitting assembly 2 can emit cross laser lines to the installation positions of the top beam 71 and the two side columns 72 of the rear frame 7. With this configuration, during the assembly of the rear frame onto the upper frame, the top beam 71 and the two side columns 72 of the rear frame 7 can be positioned and installed based on the emitted cross laser lines, eliminating the need for multiple measurements and calculations. This is easy to operate, saves time and effort, and effectively reduces errors caused by human operation. Moreover, the vertical line of the cross laser line is perpendicular to the counterweight mounting surface 61, so that the positioning of the top beam 71 and the two side columns 72 of the rear frame 7 is based on the counterweight mounting surface 61. Using the same positioning reference can eliminate positioning errors and conversion errors caused by different references, further improving the positioning accuracy of the rear frame and effectively avoiding situations where rework or repair is required after assembly, which would greatly increase production costs.

[0058] In one implementation, refer to the appendix. Figure 1 and attached Figure 2As shown, the cross laser emitting assembly 2 includes a swing arm 21 and a first cross laser emitter 22. One end of the swing arm 21 is rotatably connected to the base frame 1, and the swing arm 21 can rotate between a first position, a second position, and a third position. In the first position, the swing arm 21 is perpendicular to the counterweight mounting surface 61. In the second position, the swing arm 21 is parallel to the counterweight mounting surface 61 and extends along one side of the transverse direction of the upper frame 6. In the third position, the swing arm 21 is parallel to the counterweight mounting surface 61 and extends along the other side of the transverse direction of the upper frame 6. The first cross laser emitter 22 is disposed on the swing arm 21 and is used to emit cross laser lines.

[0059] In practical applications, after positioning the base frame 1 on the counterweight mounting surface 61 of the upper frame 6, the first cross laser emitter 22 on the swing arm 21 is adjusted so that when the swing arm is in the first position, the vertical line of the cross laser line emitted by the first cross laser emitter 22 can be perpendicular to the counterweight mounting surface 61. Moreover, since the swing arm in the second or third position is perpendicular to the swing arm in the first position, it is also ensured that when the swing arm is in the second or third position, the vertical line of the cross laser line emitted by the first cross laser emitter 22 can be perpendicular to the counterweight mounting surface 61.

[0060] Understandably, by rotating the swing arm 21 between the first position, the second position, and the third position, cross laser lines can be emitted to the installation positions of the top beam 71 of the rear frame 7 and the columns 72 on both sides.

[0061] Furthermore, the cross laser emitting assembly 2 also includes a first slide rail 23 and a first scale. The first slide rail 23 is fixedly mounted on the swing arm 21 and its length direction is consistent with the length direction of the swing arm 21. The first cross laser emitter 22 is slidably connected to the first slide rail 23. The first scale is mounted on the first slide rail 23 and its extension direction is consistent with the first slide rail 23.

[0062] In practical applications, the positioning and installation process of the rear frame 7 on the upper frame 6 is as follows:

[0063] Rotate the swing arm 21 to the second position, and then slide the first cross laser emitter 22 on the first slide rail 23 to the predetermined scale line. The position of the vertical line of the cross laser line emitted by the first cross laser emitter 22 is the position of one side column 72 of the rear frame 7. Based on the vertical line of the cross laser line, the positioning and installation of one side column 72 of the rear frame 7 can be achieved. Then, by rotating the swing arm 21 to the third position, the positioning and installation of the other side column 72 of the rear frame 7 can be achieved in the same way. Finally, the top beam 71 of the rear frame 7 is positioned and installed. Specifically, a scale is pre-installed on the top beam 71 and the two ends of the top beam 71 are roughly placed on the tops of the columns 72 on both sides. Rotate the swing arm 21 to the first position and move the first cross laser emitter 22 until the cross laser line it emits falls on the scale. By adjusting the position of the top beam 71, the required scale line on the scale is aligned with the vertical line of the cross laser line. In this way, the positioning of the top beam 71 is completed. Finally, the top beam 71 is fixed to complete the installation.

[0064] In one embodiment, the base frame 1 is provided with a first limiting structure 3, a second limiting structure 4 and a third limiting structure 5. The first limiting structure 3 is configured to restrict the swing arm 21 in the first position from rotating in the direction of the second or third position. The second limiting structure 4 is configured to restrict the swing arm 21 in the second position from rotating downward. The third limiting structure 5 is configured to restrict the swing arm 21 in the third position from rotating downward.

[0065] By setting the first limiting structure 3, the second limiting structure 4 and the third limiting structure 5, the swing arm 21 can be accurately limited to the first position, the second position or the third position, ensuring the accuracy of the positioning and installation of the rear frame 7, so that the swing arm 21 can be accurately rotated to the first position, the second position or the third position by simply rotating the swing arm 21 manually.

[0066] In this embodiment, the swing arm 21 may be provided with a handle that facilitates the operator to apply force.

[0067] In one embodiment, a bracket is provided on the base frame 1, and the first limiting structure 3 includes two limiting rods. The two limiting rods are supported on the bracket and are used to abut against the two sides of the swing arm 21 in the first position. With this configuration, the two limiting rods can restrict the swing arm 21 in the first position from rotating in the direction of the second or third position.

[0068] Specifically, the two limit rods can be placed on the bracket to limit the movement of the swing arm 21. When the limit is not needed, the two limit rods can be removed to avoid the rotation of the swing arm 21. Alternatively, the two limit rods can be hinged to the bracket to have a limit position for limiting the swing arm 21 and a avoidance position for avoiding the rotation of the swing arm 21.

[0069] In one embodiment, the second limiting structure 4 includes a first limiting pad, which is disposed at the first end of the base frame 1 in the transverse direction of the upper frame 6 and is used to abut against the bottom surface of the swing arm 21 in the second position. With this arrangement, the abutting action of the first limiting pad against the swing arm 21 can restrict the swing arm 21 in the second position from rotating downward.

[0070] In one embodiment, the third limiting structure 5 includes a second limiting pad, which is disposed at the second end of the base frame 1 in the lateral direction of the upper frame 6 and is used to abut against the bottom surface of the swing arm 21 in the third position. With this arrangement, the abutting action of the second limiting pad against the swing arm 21 can restrict the swing arm 21 in the third position from rotating downward.

[0071] In one embodiment, the base frame 1 includes a base 11 and two crossbars 12. The base 11 is provided with positioning holes, which can be aligned and connected with the counterweight mounting holes on the counterweight mounting surface 61 by positioning pins. The two crossbars 12 are disposed on the base 11 and extend laterally along the upper frame 6. One end of the swing arm 21 is provided with a pivot, which is disposed between the two crossbars 12 and its two ends are rotatably connected to the two crossbars 12 respectively. With this arrangement, the swing arm 21 is rotatably connected to the base frame 1, and is supported by the two crossbars 12, making the structure stable and reliable.

[0072] In one implementation, refer to the appendix. Figure 3 and attached Figure 4 As shown, the cross laser emitting assembly 2 includes a support frame 24, a second cross laser emitter 25, and a reflective component 26. The support frame 24 is fixedly mounted on the base frame 1 and extends in a direction perpendicular to the counterweight mounting surface 61. The top of the support frame 24 has an insertion interface. The second cross laser emitter 25 is located on the front side of the support frame 24. The reflective component 26 includes a connecting rod 261, a reflective arm 262, a first reflector 263, and a second reflector 264. The connecting rod 261 and the reflective arm 262 are connected in a cross shape. Both ends of the connecting rod 261 can be detachably inserted into the insertion interface of the support frame 24. The reflective arm 262 extends laterally along the upper frame 6. The first end of the reflective arm 262 has a support arm extending forward of the second cross laser emitter 25. The first reflector 263 is located at the end of the support arm and is correspondingly positioned to the second cross laser emitter 25. The second reflector 264 is located at the second end of the reflective arm 262 and is correspondingly positioned to the first reflector 263.

[0073] Furthermore, the cross laser emitting assembly 2 also includes a second slide rail 27, a second scale, a third slide rail 28, and a third scale. The second slide rail 27 is fixedly disposed on the front side of the support frame 24 and extends along the extension direction of the support frame 24. The second cross laser emitter 25 is slidably connected to the second slide rail 27. The second scale is disposed on the second slide rail 27 and extends in the same direction as the second slide rail 27. The third slide rail 28 is fixedly disposed on the second end of the reflector arm 262 and extends along the extension direction of the emitting arm. The second reflector 264 is slidably connected to the third slide rail 28 through a sliding seat. The third scale is disposed on the third slide rail 28 and extends in the same direction as the third slide rail 28.

[0074] In practical applications, the positioning and installation process of the rear frame 7 on the upper frame 6 is as follows:

[0075] One end of the connecting rod 261 is inserted into the socket of the support frame 24 so that the second end of the reflector arm 262 extends toward the installation position of the side column 72 of the rear frame 7. Then, the second reflector 264 is slid on the third slide rail 28 to the required scale line. At this time, the cross laser line emitted by the second cross laser emitter 25 can be projected onto the installation position of the side column 72 of the rear frame 7 through the reflection of the first reflector 263 and the second reflector 264. Based on this cross laser line, the side column 72 to be installed can be positioned and installed. Similarly, when positioning and installing the other side column 72, the other end of the connecting rod 261 is inserted into the socket of the support frame 24 so that the second end of the reflector arm 262 extends toward the installation position of the other side column 72 of the rear frame 7. Then, the second reflector 264 is slid on the third slide rail 28 to the required scale line. At this time, the second cross laser... The cross laser line emitted by the transmitter 25 can be reflected by the first reflector 263 and the second reflector 264 and projected onto the installation position of the other side column 72 of the rear frame 7. Based on this cross laser line, the column 72 to be installed can be positioned and installed. After both sides of the rear frame 7 are installed, the top beam 71 of the rear frame 7 is finally positioned and installed. A scale is pre-installed on the top beam 71 and the two ends of the top beam 71 are roughly placed on the top of the columns 72 on both sides. The connecting rod 261 is pulled out from the insertion interface of the support frame 24 to remove the reflector 26. After the reflector 26 is removed, the cross laser line emitted by the second cross laser transmitter 25 falls on the scale. By adjusting the position of the top beam 71, the required scale line on the scale is aligned with the vertical line of the cross laser line. Thus, the positioning of the top beam 71 is completed. Finally, the top beam 71 is fixed to complete the installation.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0077] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0078] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A rear frame auxiliary mounting device, characterized in that, include: The base frame (1) is used to position itself on the counterweight mounting surface (61) at the rear end of the upper frame (6); and The cross laser emitting assembly (2) is set on the base frame (1) and can emit cross laser lines to the installation positions of the top beam (71) of the rear frame (7) and the columns (72) on both sides respectively, and the vertical line of the cross laser line is perpendicular to the counterweight mounting surface (61). The cross-shaped laser emitting assembly (2) includes: A swing arm (21), one end of which is rotatably connected to the base frame (1), and the swing arm (21) is rotatable between a first position, a second position, and a third position. In the first position, the swing arm (21) is perpendicular to the counterweight mounting surface (61). In the second position, the swing arm (21) is parallel to the counterweight mounting surface (61) and extends along one side of the transverse direction of the upper frame (6). In the third position, the swing arm (21) is parallel to the counterweight mounting surface (61) and extends along the other side of the transverse direction of the upper frame (6). The first cross laser emitter (22) is mounted on the swing arm (21) and is used to emit the cross laser line.

2. The rear frame auxiliary installation device according to claim 1, characterized in that, The cross laser emitting assembly (2) further includes a first slide rail (23) and a first scale. The first slide rail (23) is fixedly mounted on the swing arm (21) and its length direction is consistent with the length direction of the swing arm (21). The first cross laser emitter (22) is slidably connected to the first slide rail (23). The first scale is mounted on the first slide rail (23) and its extension direction is consistent with the first slide rail (23).

3. The rear frame auxiliary installation device according to claim 1, characterized in that, The base frame (1) is provided with a first limiting structure (3), a second limiting structure (4) and a third limiting structure (5). The first limiting structure (3) is configured to restrict the swing arm (21) in the first position from rotating toward the second position or the third position. The second limiting structure (4) is configured to restrict the swing arm (21) in the second position from rotating downward. The third limiting structure (5) is configured to restrict the swing arm (21) in the third position from rotating downward.

4. The rear frame auxiliary installation device according to claim 3, characterized in that, The base frame (1) is provided with a bracket, and the first limiting structure (3) includes two limiting rods. The two limiting rods are supported on the bracket and are used to abut against the two sides of the swing arm (21) in the first position respectively.

5. The rear frame auxiliary installation device according to claim 4, characterized in that, The second limiting structure (4) includes a first limiting pad, which is disposed at the first end of the base frame (1) in the transverse direction of the upper frame (6) and is used to abut against the bottom surface of the swing arm (21) in the second position.

6. The rear frame auxiliary mounting device according to claim 5, characterized in that, The third limiting structure (5) includes a second limiting pad, which is disposed at the second end of the base frame (1) in the transverse direction of the upper frame (6) and is used to abut against the bottom surface of the swing arm (21) in the third position.

7. The rear frame auxiliary mounting device according to claim 1, characterized in that, The base frame (1) includes: The base (11) is provided with a positioning hole, which can be aligned and connected with the counterweight mounting hole on the counterweight mounting surface (61) by a positioning pin; Two crossbars (12) are provided on the base (11) and extend laterally along the upper frame (6); One end of the swing arm (21) is provided with a pivot, which is located between the two crossbars (12) and its two ends are rotatably connected to the two crossbars (12) respectively.

8. A rear frame auxiliary installation device, characterized in that, include: The base frame (1) is used to position itself on the counterweight mounting surface (61) at the rear end of the upper frame (6); and The cross laser emitting assembly (2) is set on the base frame (1) and can emit cross laser lines to the installation positions of the top beam (71) of the rear frame (7) and the columns (72) on both sides respectively, and the vertical line of the cross laser line is perpendicular to the counterweight mounting surface (61). The cross-shaped laser emitting assembly (2) includes: The support frame (24) is fixedly mounted on the base frame (1) and extends in a direction perpendicular to the counterweight mounting surface (61). The top of the support frame (24) is provided with an insertion interface. A second cross laser emitter (25) is disposed on the front side of the support frame (24); and The reflecting component (26) includes a connecting rod (261), a reflecting arm (262), a first reflecting mirror (263), and a second reflecting mirror (264). The connecting rod (261) and the reflecting arm (262) are connected in a cross shape. Both ends of the connecting rod (261) can be detachably plugged into the interface of the support frame (24). The reflecting arm (262) extends laterally along the upper frame (6). The first end of the reflecting arm (262) is provided with a support arm extending in front of the second cross laser emitter (25). The first reflecting mirror (263) is disposed at the end of the support arm and is disposed corresponding to the second cross laser emitter (25). The second reflecting mirror (264) is disposed at the second end of the reflecting arm (262) and is disposed corresponding to the first reflecting mirror (263).

9. The rear frame auxiliary mounting device according to claim 8, characterized in that, The cross-shaped laser emitting assembly (2) also includes: The second slide rail (27) and the second scale are fixedly disposed on the front side of the support frame (24) and extend along the extension direction of the support frame (24). The second cross laser emitter (25) is slidably connected to the second slide rail (27). The second scale is disposed on the second slide rail (27) and extends in the same direction as the second slide rail (27). The third slide rail (28) and the third scale are fixedly disposed on the second end of the reflector arm (262) and extend along the extension direction of the reflector arm (262). The second reflector (264) is slidably connected to the third slide rail (28) through a sliding seat. The third scale is disposed on the third slide rail (28) and extends in the same direction as the third slide rail (28).

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