Laser perpendicularity measuring device

Abstract

The utility model provides a laser perpendicularity measuring device which comprises a supporting base, a transverse horizontal adjusting mechanism is arranged on one side or two sides of the supporting base, a hinge seat is arranged at the top of the supporting base, a rotating seat is rotatably arranged on the hinge seat, and the rotating direction of the rotating seat is the longitudinal direction which is vertically crossed with the transverse horizontal adjusting mechanism. A locking structure used for locking the rotating seat is arranged on the hinge seat, a vertical frame and a longitudinal horizontal bubble are arranged at the top of the rotating seat, and a laser measuring body is arranged on the vertical frame in a liftable mode. The structure that the transverse horizontal adjusting mechanism is matched with the rotating seat is arranged on the supporting base, so that the function of quickly and accurately leveling the laser measurement body in the transverse direction and the longitudinal direction is achieved, and the problem that a lifting rod in an existing measurement device is difficult to quickly adjust to a standard vertical state is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of measuring devices, and in particular to a laser verticality measuring device. Background Technology

[0002] In the field of building construction, the verticality of a building is a crucial quality indicator for ensuring structural stability and safety. From traditional building construction to the development of modern high-rise buildings, verticality measurement has always been a key aspect of construction quality control.

[0003] In the early stages of building construction, workers often used the plumb line method to check verticality. This method involves suspending a plumb line and observing the gap between the plumb line and the wall or structural surface to determine its verticality. However, this method is greatly affected by human reading errors, resulting in low measurement accuracy. Furthermore, in high-rise buildings or complex structural construction environments, the plumb line is easily affected by external factors such as wind, leading to unstable measurement results and poor repeatability. This makes it difficult to meet the requirements of modern construction engineering for high-precision and high-efficiency construction control.

[0004] With the development of measurement technology, laser measuring equipment has been increasingly applied to the detection of wall verticality. However, existing laser measuring devices require that their lifting rods be in a standard vertical position before use, and there is currently a lack of a structure or mechanism that facilitates quick adjustment of the lifting rods to a vertical position, thus affecting the efficiency and ease of operation of the measurement work. Therefore, a laser verticality measuring device is proposed to solve the above problems. Utility Model Content

[0005] The main purpose of this invention is to provide a laser verticality measuring device to solve the problem that existing laser measuring equipment is difficult to achieve a standard vertical position.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a laser verticality measuring device, including a support base, a horizontal adjustment mechanism provided on one or both sides of the support base, a hinge seat provided on the top of the support base, a rotating seat rotatably provided on the hinge seat, the rotation direction of the rotating seat being longitudinally perpendicular to the horizontal adjustment mechanism, a locking structure for locking the rotating seat provided on the hinge seat, a stand and a longitudinal horizontal bubble provided on the top of the rotating seat, and a laser measuring body is raised and lowered on the stand;

[0007] The horizontal adjustment mechanism includes a U-shaped frame connected to the support base and a movable seat movably set in the U-shaped frame. The bottom of the movable seat is provided with movable wheels. Inclined grooves are symmetrically arranged on the two side walls of the U-shaped frame. Movable rods that slide in cooperation with the inclined grooves are symmetrically arranged on both sides of the movable seat. The U-shaped frame is also provided with a horizontal movement drive mechanism for driving the movable seat to move horizontally and a horizontal level bubble.

[0008] When there is only one horizontal adjustment mechanism, the bottom of the support base is equipped with fixed moving wheels.

[0009] In the preferred embodiment, the movable seat is provided with a vertical moving groove that cooperates with the transverse driving mechanism;

[0010] The transverse drive mechanism includes two symmetrically arranged support plates, with two slide rods and a rotatable lead screw between the two support plates. The slide rods are fitted with transverse seats that are threadedly connected to the lead screw. The transverse seats are located in the vertical movement groove, and push plates are located on both sides of the transverse seats at both ends. The width of the push plates is greater than that of the vertical movement groove. One end of the lead screw passes through the support plate and is connected to a first rotating handle.

[0011] In the preferred embodiment, when the movable seat is located in the middle of the inclined slide, the movable wheel is flush with the fixed wheel.

[0012] In the preferred embodiment, the bottom of the rotating base is hemispherical, and a groove is provided in the middle, with arc-shaped teeth in the groove;

[0013] The locking structure includes a lifting assembly mounted on the hinge seat, and the lifting assembly is provided with locking teeth located below the arc-shaped teeth and capable of engaging with them.

[0014] In the preferred embodiment, the lifting assembly includes a Z-shaped lifting frame and multiple elastic telescopic components for supporting the Z-shaped lifting frame. The Z-shaped lifting frame is provided with a through slot to avoid the rotating seat. The elastic telescopic component includes a vertical rod that is set on the hinge seat and moves through the Z-shaped lifting frame. The top of the vertical rod is provided with an anti-slip cap and is externally fitted with a support spring located between the Z-shaped lifting frame and the hinge seat.

[0015] In a preferred embodiment, the elastic telescopic component also includes a bottom support block connected to the hinge seat for supporting the upright.

[0016] In the preferred embodiment, the support frame consists of four columns, and each column is equipped with a connecting plate at the top and bottom.

[0017] The laser measurement body includes a laser measurement unit. The rear side of the laser measurement unit is provided with a lifting seat that passes through the upright frame longitudinally. Both sides of the lifting seat are provided with adjustment seats that pass through the upright frame laterally.

[0018] The inner side of the upright has two rows of locking holes symmetrically arranged, and the adjusting seat is equipped with a locking component that can cooperate with the locking holes.

[0019] In the preferred embodiment, the locking assembly includes a telescopic cavity disposed in the adjusting seat, two fixed rods disposed in the telescopic cavity, a movable plate movably disposed on the fixed rods, a telescopic spring that abuts against the movable plate being fitted on the outside of the fixed rods, and a locking rod and an adjusting rod movably passing through the adjusting seat disposed on the side of the movable plate, wherein the locking rod can cooperate with the locking hole, and the adjusting rod is located at the end of the adjusting seat that protrudes from the upright.

[0020] In a preferred embodiment, the laser measurement unit includes an outer casing, which contains a receiving cavity with one end open. The bottom of the outer casing has a sliding groove, and a movable stage is movably disposed within the receiving cavity. A connecting block that movably passes through the sliding groove is disposed at the bottom of the inner end of the movable stage. An L-shaped cover plate that can close the opening of the receiving cavity is disposed at the bottom of the connecting block. A laser measurement device is disposed at the top of the movable stage. A first magnetic block is disposed on the inner side of the vertical plate of the L-shaped cover plate, and a second magnetic block that matches the first magnetic block is disposed at the opening of the receiving cavity.

[0021] This invention provides a laser verticality measuring device. By setting a horizontal adjustment mechanism on the support base that cooperates with the rotating seat, it achieves rapid and accurate leveling of the laser measuring body in both the horizontal and vertical directions. This effectively solves the problem in existing measuring devices where the lifting rod is difficult to quickly adjust to a standard vertical state. The horizontal adjustment mechanism adopts a U-shaped frame and a sliding cooperation structure with the moving seat, combined with a horizontal drive mechanism and a horizontal level bubble, enabling rapid adjustment and accurate calibration of the device's horizontal attitude. At the same time, a locking structure is provided between the rotating seat and the hinged seat, which facilitates locking the angle after adjustment, improving stability during the measurement process. In addition, the vertical level bubble set on the top of the stand can further assist in judging whether the lifting rod is in a vertical state, thereby improving measurement accuracy. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is an overall structural diagram of the present invention;

[0024] Figure 2 This is a partial structural diagram of the horizontal adjustment mechanism of this utility model;

[0025] Figure 3 This is a structural diagram of the transverse drive mechanism of this utility model;

[0026] Figure 4 This is a diagram of the hinged seat, rotating seat, locking structure, and upright frame connection structure of this utility model;

[0027] Figure 5 This is a utility model Figure 4 A half-section structural diagram;

[0028] Figure 6 This is a structural diagram of the lifting component of this utility model;

[0029] Figure 7 This is a utility model Figure 5 Another perspective on the structure diagram;

[0030] Figure 8 This is a structural diagram showing the connection between the support frame and the laser measurement body of this utility model;

[0031] Figure 9 This is a utility model Figure 8 Another perspective on the structure diagram;

[0032] Figure 10 This is a structural diagram of the locking component of this utility model;

[0033] Figure 11 This is a half-sectional structural diagram of the laser measurement unit of this utility model.

[0034] In the diagram: 1. Support base; 2. Horizontal adjustment mechanism; 201. U-shaped frame; 202. Inclined slide groove; 203. Drive moving seat; 204. Movable moving wheel; 205. Movable rod; 206. Vertical moving groove; 207. Support plate; 208. Lead screw; 209. Slide rod; 210. Horizontal moving seat; 211. Push plate; 212. First rotating handle; 3. Fixed moving wheel; 7. Hinge seat; 8. Rotating seat; 9. Locking structure; 91. Groove; 92. Arc tooth; 93. Lifting assembly; 930. Z-shaped lifting frame; 931. Through groove; 932. Elastic telescopic component; 9321. Upright pole; 9322. Anti-slip cap; 9323. Support spring; 9323. Bottom support block. 9324; Locking tooth 94; Stand 10; Column 101; Locking hole 102; Connecting plate 103; Laser measuring body 11; Laser measuring unit 110; Outer case 1101; Receiving cavity 1102; Sliding groove 1103; Moving stage 1104; L-shaped cover plate 1105; Connecting block 1106; Laser measuring device 1107; Second magnetic block 1108; First magnetic block 1109; Lifting seat 111; Adjusting seat 112; Locking assembly 113; Telescopic cavity 1130; Fixed rod 1131; Telescopic spring 1132; Movable plate 1134; Locking rod 1135; Adjusting rod 1136. Detailed Implementation

[0035] like Figure 1-11 As shown, a laser verticality measuring device includes a support base 1, and a horizontal adjustment mechanism 2 is provided on one or both sides of the support base 1. When there are two horizontal adjustment mechanisms 2, they are symmetrically arranged on both sides of the support base 1.

[0036] The top of the support base 1 is provided with a hinge seat 7, and a rotating seat 8 is rotatably provided on the hinge seat 7. The rotation direction of the rotating seat 8 is longitudinal, perpendicular to the horizontal adjustment mechanism 2. The hinge seat 7 is provided with a locking structure 9 for locking the rotating seat 8. The top of the rotating seat 8 is provided with a stand 10 and a longitudinal horizontal bubble 13. The longitudinal horizontal bubble 13 facilitates the observation of the longitudinal horizontal condition. The laser measuring body 11 is raised and lowered on the stand 10.

[0037] With this design, the horizontal level of the measuring device can be adjusted by the horizontal level adjustment mechanism 2, and its vertical level can be adjusted by the rotation of the rotating seat 8, thereby ensuring that the laser measuring body 11 on the stand 10 remains in an absolutely horizontal state. By raising and lowering it on the stand 10, multi-point measurement of the building facade can be achieved, and its verticality can be obtained based on the measured distance.

[0038] The horizontal adjustment mechanism 2 includes a U-shaped frame 201 connected to the support base 1 and a movable seat 203 movably disposed in the U-shaped frame 201. The bottom of the movable seat 203 is provided with movable wheels 204. Inclined grooves 202 are symmetrically arranged on the two side walls of the U-shaped frame 201. Movable rods 205 that slide and cooperate with the inclined grooves 202 are symmetrically arranged on both sides of the movable seat 203. The U-shaped frame 201 is also provided with a horizontal movement drive mechanism for driving the movable seat 203 to move laterally and a horizontal leveling bubble 12.

[0039] With this design, the moving seat 203 can be driven to move laterally in the U-shaped frame 201 by the lateral drive mechanism. By using the sliding of the movable rod 205 in the inclined slide 202, the height difference between the moving seat 203 and the U-shaped frame 201 can be adjusted, thereby adjusting the lateral levelness of the support base 1. The lateral level bubble 12 facilitates the passage of lateral level conditions.

[0040] It should be noted that when there is only one horizontal adjustment mechanism 2, the bottom of the support base 1 is equipped with fixed moving wheels 3.

[0041] The fixed caster 3 and / or the movable caster 204 facilitate the movement of the entire device and also facilitate the movement of the movable base 203. In this embodiment, both the fixed caster 3 and the movable caster 204 are casters with locking function. These are different commercially available products, so they will not be described in detail here.

[0042] In the preferred embodiment, the movable seat 203 is provided with a vertical moving groove 206 that cooperates with the transverse driving mechanism;

[0043] The transverse drive mechanism includes two symmetrically arranged support plates 207, one of which is located on the top of the U-shaped frame 201 and the other is located on the top of the support base 1. Two slide rods 209 and a rotatable lead screw 208 are arranged between the two support plates 207. The lead screw 208 is located between the two slide rods 209 and is rotatably arranged between the two support plates 207 via bearings. A transverse shift seat 210 is movably fitted on the outside of the slide rods 209 and threadedly connected to the lead screw 208. The transverse shift seat 210 is located in the vertical moving groove 206, and push plates 211 are located on both sides of the moving seat 203 at both ends. The width of the push plates 211 is greater than that of the vertical moving groove 206. It should be noted that there is a movable contact between the push plates 211 and the transverse shift seat 210. One end of the lead screw 208 passes through the support plate 207 and is connected to a first rotating handle 212.

[0044] With this design, the first rotating handle 212 can control the rotation of the lead screw 208, thereby causing the transverse seat 210 to move laterally on it, and the push plate 211 can be used to push the moving seat 203 to move. The vertical moving groove 206 is set so as not to affect the lifting and lowering of the moving seat 203 during the movement process.

[0045] In the preferred embodiment, when the movable seat 203 is located in the middle of the inclined slide 202, the movable wheel 204 is flush with the fixed wheel 3. In addition, when there are two horizontal adjustment mechanisms 2, when the movable wheels 204 of both horizontal adjustment mechanisms 2 are located in the middle of the inclined slide 202, they are flush with each other.

[0046] In the preferred embodiment, the bottom of the rotating seat 8 is hemispherical, and a groove 91 is provided in the middle, and an arc-shaped tooth 92 is provided in the groove 91;

[0047] The locking structure 9 includes a lifting assembly 93 disposed on the hinge seat 7. The lifting assembly 93 is provided with a locking tooth 94 located below the arc-shaped tooth 92 and capable of meshing with it. Thus, through the meshing relationship between the locking tooth 94 and the arc-shaped tooth 92, the rotating seat 8 maintains a corresponding angle. At the same time, by lowering the lifting assembly 93, the locking tooth 94 can be disengaged from the arc-shaped tooth 92, thereby facilitating the adjustment of the angle of the rotating seat 8.

[0048] In the preferred embodiment, the lifting assembly 93 includes a Z-shaped lifting frame 930 and a plurality of elastic telescopic members 932 for supporting the Z-shaped lifting frame 930. In this embodiment, there are four elastic telescopic members 932, which are located at the outer corners of the top plate and bottom of the Z-shaped lifting frame 930, respectively. The Z-shaped lifting frame 930 is provided with a through slot 931 for avoiding the rotating seat 8, thereby avoiding affecting the normal rotation function of the rotating seat 8. The Z-shaped lifting frame 930 is also designed to facilitate the user to control its lifting by stepping on its top plate.

[0049] The elastic telescopic component 932 includes a vertical rod 9321 mounted on the hinge seat 7 and movably passing through the Z-shaped lifting frame 930. The top of the vertical rod 9321 is provided with an anti-slip cap 9322, and an external support spring 9323 is mounted between the Z-shaped lifting frame 930 and the hinge seat 7. The supporting force of the support spring 9323 should meet the requirements of locking the rotating seat 8.

[0050] In the preferred embodiment, the elastic telescopic member 932 also includes a bottom support block 9324 connected to the hinge seat 7 for supporting the upright 9321. The support block 9324 can create corresponding support adjustment for the hinge seat 7 position that does not have support adjustment, and it is fixed on the hinge seat 7.

[0051] In the preferred embodiment, the support frame 10 consists of four columns 101, and each column 101 has a connecting plate 103 at its top and bottom, thus forming an integral structure.

[0052] The laser measurement body 11 includes a laser measurement unit 110. The laser measurement unit 110 has a lifting seat 111 that extends longitudinally through the stand 10 on its tail side. Both sides of the lifting seat 111 have adjustment seats 112 that extend laterally through the stand 10, so that the laser measurement unit 110 can be stably raised and lowered in the stand 10 to adjust its detection height.

[0053] The inner side of the support frame 10 is symmetrically provided with two rows of locking holes 102. The adjusting seat 112 is provided with a locking component 113 that can cooperate with the locking holes 102, thereby locking the detection height of the laser measuring unit 110.

[0054] In a preferred embodiment, the locking assembly 113 includes a telescopic cavity 1130 disposed in the adjusting seat 112. Two fixing rods 1131 are disposed in the telescopic cavity 1130. A movable plate 1134 is movably disposed on the fixing rods 1131. A telescopic spring 1132 that abuts against the movable plate 1134 is fitted on the outside of the fixing rods 1131. A locking rod 1135 and an adjusting rod 1136 that movably pass through the adjusting seat 112 are disposed on the side of the movable plate 1134. The locking rod 1135 can cooperate with the locking hole 102, and the adjusting rod 1136 is located at the end of the adjusting seat 112 that protrudes from the support frame 10.

[0055] With this design, pressing the adjusting rod 1136 causes the movable plate 1134 to retract the locking rod 1135, thereby engaging its locking relationship with the locking hole 102. At the same time, the telescopic spring 1132 is compressed accordingly, which facilitates the adjustment of the detection height of the laser measuring unit 110. After releasing the adjusting rod 1136, the movable plate 1134 can be reset under the action of the telescopic spring 1132, thereby causing the locking rod 1135 to extend again and insert into the corresponding locking hole 102, completing the re-locking of the laser measuring unit 110.

[0056] In a preferred embodiment, the laser measurement unit 110 includes an outer casing 1101, which contains a receiving cavity 1102 with one end open. The bottom of the outer casing 1101 is provided with a sliding groove 1103. In this embodiment, there are two sliding grooves 1103. A moving stage 1104 is movably disposed in the receiving cavity 1102. A connecting block 1106 is provided at the bottom of the inner end of the moving stage 1104, which movably passes through the sliding groove 1103. The bottom end of the connecting block 1106 is provided with an L-shaped cover plate 1105 that can close the opening of the receiving cavity 1102. In addition, a handle is provided on the outside of the vertical plate of the L-shaped cover plate 1105 to facilitate the control of its opening and closing. A laser measurement device 1107 is provided on the top of the moving stage 1104.

[0057] This design allows the laser measuring device 1107 to be stored in the receiving cavity 1102 when not in use, thus protecting it. When in use, it can be pulled out of the receiving cavity 1102 by pulling out the L-shaped cover plate 1105, so that the facade can be inspected.

[0058] It should be noted that the detection direction of the laser measuring device 1107 is perpendicular to the vertical plate of the L-shaped cover plate 1105 to avoid being affected by it. In addition, the laser measuring device 1107 is a commonly used device in this field, so it will not be described in detail here.

[0059] The inner side of the vertical plate of the L-shaped cover plate 1105 is provided with a first magnetic block 1109, and the opening of the receiving cavity 1102 is provided with a second magnetic block 1108 that is adapted to the first magnetic block 1109. Thus, when the closed state, the cooperation between the first magnetic block 1109 and the second magnetic block 1108 can be used to prevent necessary sliding.

[0060] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A laser verticality measuring device, characterized in that: Includes a support base (1), a horizontal adjustment mechanism (2) is provided on one or both sides of the support base (1), a hinge seat (7) is provided on the top of the support base (1), a rotating seat (8) is rotatably provided on the hinge seat (7), the rotation direction of the rotating seat (8) is a longitudinal direction perpendicular to the horizontal adjustment mechanism (2), a locking structure (9) for locking the rotating seat (8) is provided on the hinge seat (7), a stand (10) and a longitudinal horizontal bubble (13) are provided on the top of the rotating seat (8), and a laser measuring body (11) is provided on the stand (10) that can be raised and lowered. The horizontal adjustment mechanism (2) includes a U-shaped frame (201) connected to the support base (1) and a movable seat (203) movably disposed in the U-shaped frame (201). The bottom of the movable seat (203) is provided with movable wheels (204). Inclined grooves (202) are symmetrically arranged on the two side walls of the U-shaped frame (201). Movable rods (205) that slide and cooperate with the inclined grooves (202) are symmetrically arranged on both sides of the movable seat (203). The U-shaped frame (201) is also provided with a horizontal movement drive mechanism for driving the movable seat (203) to move laterally and a horizontal level bubble (12). When there is one horizontal adjustment mechanism (2), the bottom of the support base (1) is provided with a fixed moving wheel (3).

2. The laser verticality measuring device according to claim 1, characterized in that: The movable seat (203) is provided with a vertical moving groove (206) that cooperates with the transverse driving mechanism. The transverse drive mechanism includes two symmetrically arranged support plates (207), with two slide rods (209) and a rotatable lead screw (208) arranged between the two support plates (207). The slide rods (209) are externally fitted with transverse seats (210) that are threadedly connected to the lead screw (208). The transverse seats (210) are located in the vertical moving groove (206), and push plates (211) are arranged at both ends of the transverse seats (203) on both sides. The width of the push plates (211) is greater than that of the vertical moving groove (206). One end of the lead screw (208) passes through the support plate (207) and is connected to a first rotating handle (212).

3. The laser verticality measuring device according to claim 2, characterized in that: When the movable seat (203) is located in the middle of the inclined slide (202), the movable wheel (204) is flush with the fixed wheel (3).

4. The laser verticality measuring device according to claim 1, characterized in that: The bottom of the rotating seat (8) is hemispherical and a groove (91) is provided in the middle, and an arc-shaped tooth (92) is provided in the groove (91). The locking structure (9) includes a lifting assembly (93) disposed on the hinge seat (7), and the lifting assembly (93) is provided with a locking tooth (94) located below the arc-shaped tooth (92) and capable of engaging with it.

5. The laser verticality measuring device according to claim 4, characterized in that: The lifting assembly (93) includes a Z-shaped lifting frame (930) and a plurality of elastic telescopic members (932) for supporting the Z-shaped lifting frame (930). The Z-shaped lifting frame (930) is provided with a through slot (931) for avoiding the rotating seat (8). The elastic telescopic member (932) includes a vertical rod (9321) provided on the hinge seat (7) and moving through the Z-shaped lifting frame (930). The top of the vertical rod (9321) is provided with an anti-slip cap (9322) and an external support spring (9323) located between the Z-shaped lifting frame (930) and the hinge seat (7).

6. The laser verticality measuring device according to claim 5, characterized in that: The elastic telescopic member (932) also includes a bottom support block (9324) connected to the hinge seat (7) for supporting the upright (9321).

7. The laser verticality measuring device according to claim 1, characterized in that: The support frame (10) consists of four columns (101), and the top and bottom of the columns (101) are provided with connecting plates (103). The laser measurement body (11) includes a laser measurement unit (110). The laser measurement unit (110) has a lifting seat (111) that passes through the upright (10) longitudinally on its tail side. Both sides of the lifting seat (111) have adjustment seats (112) that pass through the upright (10) laterally. The inner side of the support frame (10) is symmetrically provided with two rows of locking holes (102), and the adjusting seat (112) is provided with a locking component (113) that can cooperate with the locking holes (102).

8. The laser verticality measuring device according to claim 7, characterized in that: The locking assembly (113) includes a telescopic cavity (1130) disposed in the adjusting seat (112). Two fixed rods (1131) are disposed in the telescopic cavity (1130). A movable plate (1134) is movably disposed on the fixed rod (1131). A telescopic spring (1132) that abuts against the movable plate (1134) is fitted on the outside of the fixed rod (1131). A locking rod (1135) and an adjusting rod (1136) that movably pass through the adjusting seat (112) are disposed on the side of the movable plate (1134). The locking rod (1135) can cooperate with the locking hole (102), and the adjusting rod (1136) is located at one end of the adjusting seat (112) that protrudes from the stand (10).

9. A laser verticality measuring device according to claim 7 or 8, characterized in that: The laser measurement unit (110) includes an outer casing (1101), an outer casing (1101) with an open-ended receiving cavity (1102) in the outer casing (1101), a sliding groove (1103) at the bottom of the outer casing (1101), a movable stage (1104) in the receiving cavity (1102), a connecting block (1106) that movably passes through the sliding groove (1103) at the bottom of the inner end of the movable stage (1104), an L-shaped cover plate (1105) that can close the opening of the receiving cavity (1102) at the bottom end of the connecting block (1106), a laser measurement device (1107) at the top of the movable stage (1104), a first magnetic block (1109) on the inner side of the vertical plate of the L-shaped cover plate (1105), and a second magnetic block (1108) that is compatible with the first magnetic block (1109) at the opening of the receiving cavity (1102).

Images