Telescopic device capable of simultaneously measuring length and width of beam body
By designing a retractable beam measuring device, combined with a back plate, right-angle fixing block, crossbar and vertical bar, the length and width of the beam can be measured simultaneously with high efficiency and high precision. This solves the problems of low efficiency and insufficient accuracy in existing technologies, and improves the efficiency and safety of the inspection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG JIANKE CONSTR ENG TECH DEV CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-17
AI Technical Summary
In existing technologies, beam dimension measurement is inefficient and lacks accuracy. In particular, when measuring multiple beams, it places high demands on the physical strength and endurance of the inspectors. Furthermore, the vertical stiffness and stability are insufficient after the measuring tape is extended, which affects measurement accuracy and engineering safety.
Design a telescopic measuring device, including a back plate, a right-angle fixing block, a horizontal bar, a vertical bar, and a telescopic bar. By using the combination of the horizontal bar and the vertical bar, the beam width and beam height can be measured simultaneously using a scale. The connection frame and reset assembly ensure the stability and accuracy of the measurement.
It improves the efficiency and accuracy of beam dimension measurement, ensures the stability and safety of measurement, reduces the physical exertion of inspection personnel, and enhances applicability and convenience.
Smart Images
Figure CN224136511U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of measuring devices, and in particular to a retractable device that can simultaneously measure the length and width dimensions of a beam. Background Technology
[0002] In building inspection and assessment, it is necessary to measure the actual dimensions of building components. Compared to the cross-sectional dimensions of columns, measuring the cross-sectional dimensions of beams is much more difficult. Since floor heights are often significantly greater than the inspectors' heights, measuring beam dimensions often requires the use of an A-frame ladder. Figure 2 As shown.
[0003] However, due to the large number of beams requiring measurement, each measurement necessitates moving an A-frame ladder, which is inefficient and places a significant strain on the endurance and physical strength of the inspectors. To improve efficiency and reduce physical exertion, some inspectors sacrifice measurement accuracy by extending the measuring tape to measure beam width and height. However, the extended tape lacks sufficient vertical stiffness and stability, making measurement difficult. Furthermore, this opportunistic method significantly impacts subsequent safety calculations and reinforcement design. To improve efficiency and ensure measurement accuracy, we designed a device that can extend and retract to simultaneously measure the length and width of beams. Utility Model Content
[0004] To improve measurement efficiency and ensure measurement accuracy, this application provides a retractable device that can simultaneously measure the length and width of a beam.
[0005] The device provided in this application, which is retractable and can simultaneously measure the length and width of a beam, adopts the following technical solution:
[0006] A retractable device for simultaneously measuring the length and width dimensions of a beam, comprising:
[0007] The connector includes a backplate, one side of which is provided with two right-angle fixing blocks. The two right-angle fixing blocks are mirrored and the backplate and the two right-angle fixing blocks partially surround each other to form a receiving groove. The tops of the two right-angle fixing blocks are horizontal and their end faces are flush.
[0008] A crossbar is set on the top of two right-angle fixing blocks and abuts against the two right-angle fixing blocks. The crossbar has a through hole, which is opposite to the receiving groove. A telescopic rod is detachably installed on the side of the crossbar near the two right-angle fixing blocks. The surface of the crossbar is marked with scale.
[0009] The vertical rod can be movably inserted into the receiving groove and through hole, and the surface of the vertical rod is marked with graduations.
[0010] By adopting the above technical solution, the backplate is the basic structural component of the entire connector, used to provide a stable mounting base and spatial positioning for other components. The corner fixing blocks are set on the backplate and are distributed in a mirror symmetrical manner. The tops of the two right-angle fixing blocks are horizontal and the end faces are flush, allowing the crossbar to be placed horizontally on top of the two right-angle fixing blocks. The beam width is measured through the scale on the surface of the crossbar. A through hole is opened on the crossbar, allowing the vertical bar to pass through the receiving groove and the through hole and move within the receiving groove and the through hole, thereby measuring the beam height through the scale on the vertical bar, thus ensuring measurement accuracy. The telescopic rod allows the crossbar and vertical bar to abut against the beam. By moving the telescopic rod, the crossbar and vertical bar can be changed, ensuring that several beams can be measured quickly, improving measurement efficiency.
[0011] Preferably, the side of the back plate with the right-angle fixing block is also provided with a connecting frame for the vertical rod to pass through. The connecting frame is located at the end of the back plate away from the right-angle fixing block, and the connecting frame is fixedly connected to the back plate. The connecting frame is arranged opposite to the receiving groove.
[0012] By adopting the above technical solution, the connecting frame can provide additional guidance and support for the vertical rod when it passes through, restricting the position of the vertical rod during the measurement process and preventing the vertical rod from tilting or swaying, thereby ensuring the accuracy and stability of the beam height measurement.
[0013] Preferably, both the vertical and horizontal bars are square bars, the receiving groove matches the vertical bar, and the connecting frame is a rectangular frame.
[0014] By adopting the above technical solution, both the vertical and horizontal bars are square bars, the receiving groove matches the vertical bar, and the connecting frame is a rectangular frame design, which makes the fit between the components tighter and more stable. Compared with round bars, the square bar design has higher structural strength and torsional resistance, and can better withstand external forces. At the same time, it reduces shaking during insertion and extraction, and improves the stability of the connection. The matching design of the receiving groove and the vertical bar, as well as the rectangular frame connecting frame design, ensure the accurate guidance and stable support of the vertical bar, thereby ensuring the stability of the measurement of the horizontal and vertical bars.
[0015] Preferably, a connecting ring is provided on the side of the crossbar near the two right-angle fixing blocks, and the connecting ring is provided with a first thread for detachable connection with the telescopic rod.
[0016] By adopting the above technical solution, the connecting ring can provide a connection point for the crossbar and the telescopic bar, enabling the first thread to achieve a detachable connection with the telescopic bar, providing a flexible connection method. The telescopic bar can be quickly installed or disassembled according to actual needs, improving applicability and convenience. At the same time, the threaded connection method can ensure the firmness of the connection and prevent the telescopic bar and the crossbar from loosening during use.
[0017] Preferably, the telescopic rod is vertically arranged and includes an inner tube and an outer tube. The inner tube is movably inserted into the outer tube. The outer wall of the inner tube near the crossbar is provided with a second thread. The inner tube away from the crossbar has a first limiting hole. An ejector block is movably arranged in the first limiting hole. The inner wall of the inner tube is provided with an elastic element connected to the ejector block. The outer tube near the crossbar has a second limiting hole. The specifications of the second limiting hole are the same as those of the first limiting hole.
[0018] By adopting the above technical solution, the outer tube can move relative to the inner tube, thereby extending the telescopic rod; after the telescopic rod extends, the elastic element drives the ejector block to eject from the first limiting hole and position itself in the second limiting hole, so that the ejector block abuts against the outer tube and the inner tube, thereby limiting the position of the outer tube relative to the inner tube, and thus limiting the length of the telescopic rod; the second thread on the outer wall of the inner tube near the crossbar can cooperate with the first thread in the connecting ring to realize the detachable connection between the inner tube and the crossbar, thereby realizing the connection between the telescopic rod and the crossbar.
[0019] Preferably, a connecting piece is provided on the outer wall of the outer tube. The connecting piece is horizontally positioned on the outer wall of the outer tube and is fixedly connected to the outer tube. A circular bubble level is fixedly provided on one side of the connecting piece.
[0020] By adopting the above technical solution, the connecting piece is horizontally set on the outer wall of the outer tube and fixedly connected to the outer tube, which can provide an installation foundation for the circular bubble level, so that the bubble level can be firmly installed and avoid loosening or falling off due to external forces. At the same time, the horizontal setting ensures the measurement accuracy of the bubble level. By observing the circular bubble level, the telescopic rod can be adjusted, thereby adjusting the horizontal and vertical rods and improving the measurement accuracy.
[0021] Preferably, it also includes a reset assembly, which includes a first limiting post, a second limiting post, a third limiting post, and a connector. The first and second limiting posts are arranged side by side on the back plate away from the receiving groove, and the third limiting post is arranged on the vertical rod away from the receiving groove. The first, second, and third limiting posts are connected by the connector.
[0022] By adopting the above technical solution, the first and second limiting posts are arranged side by side on the back plate away from the receiving groove, providing a force point for the connector. The third limiting post and the connector ensure the position between the third limiting post and the first and second limiting posts, thereby ensuring the relative position of the vertical rod, realizing the rapid reset of the vertical rod, and ensuring that the vertical rod can quickly return to its initial state.
[0023] Preferably, the connector is an elastic rope loop, which is sleeved on the first limiting post, the second limiting post, and the third limiting post.
[0024] By adopting the above technical solution, the elastic rope loop has good elasticity. When the vertical rod moves, the third limiting post moves with the vertical rod and drives the connecting piece to deform. After the vertical rod moves without position restriction, the connecting piece returns to its original state, thereby driving the third limiting post to reset through elastic tension, thus ensuring the relative position of the vertical rod and realizing the rapid reset of the vertical rod. This ensures that the vertical rod can quickly return to its initial state, which is convenient for measuring multiple beams.
[0025] In summary, this application includes at least one of the following beneficial technical effects:
[0026] 1. The backplate is the basic structural component of the entire connector, providing a stable mounting base and spatial positioning for other components. Corner fixing blocks are mounted on the backplate in a mirror-symmetrical arrangement. The tops of the two right-angle fixing blocks are horizontal and their end faces are flush, allowing the crossbar to be placed horizontally on top of the two right-angle fixing blocks. The beam width is measured through the scale on the surface of the crossbar. A through hole is provided on the crossbar, allowing the vertical bar to pass through the receiving groove and through hole and move within them. The beam height is then measured through the scale on the vertical bar, ensuring measurement accuracy. The telescopic rod allows the crossbar and vertical bar to contact the beam. Moving the telescopic rod changes the position of the crossbar and vertical bar, ensuring rapid measurement of multiple beams and improving measurement efficiency.
[0027] 2. The connecting frame provides additional guidance and support for the vertical rod when it passes through, limiting the position of the vertical rod during the measurement process and preventing it from tilting or swaying, thereby ensuring the accuracy and stability of the beam height measurement;
[0028] 3. Both the vertical and horizontal bars are square bars, with matching slots and rectangular connecting frames. This design ensures a tighter and more stable fit between the components. Compared to round bars, square bars offer higher structural strength and torsional resistance, better withstanding external forces. They also reduce wobbling during insertion and removal, improving connection stability. The matching design of the slots and vertical bars, along with the rectangular connecting frame design, ensures precise guidance and stable support for the vertical bars, thereby guaranteeing the stability of the measurements for both the horizontal and vertical bars. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of an actual use scenario of the retractable device that can simultaneously measure the length and width of a beam, as described in the embodiments of this application.
[0030] Figure 2 This is a structural schematic diagram of the retractable device that simultaneously measures the length and width of a beam, as described in the embodiments of this application.
[0031] Figure 3 This is a schematic diagram of the connector structure in an embodiment of this application;
[0032] Figure 4This is a schematic diagram of the crossbar structure in the embodiments of this application;
[0033] Figure 5 This is a schematic diagram of the telescopic rod in the embodiments of this application;
[0034] Figure 6 A schematic diagram of the vertical cross-sectional structure of the telescopic rod in the embodiments of this application;
[0035] Figure 7 This is a schematic diagram of the structure of the reset component in the embodiments of this application;
[0036] Figure 8 This is a schematic diagram of the reset component in another embodiment of this application.
[0037] Explanation of reference numerals in the attached drawings: 1. Connector; 11. Backplate; 12. Right-angle fixing block; 13. Receiving groove; 14. Connecting frame; 2. Horizontal bar; 21. Through hole; 22. Connecting ring; 3. Vertical bar; 4. Telescopic bar; 41. Inner tube; 42. Outer tube; 43. Ejector block; 44. Elastic element; 5. Connecting piece; 6. Circular bubble level; 7. Reset assembly; 71. First limiting post; 72. Second limiting post; 73. Third limiting post; 74. Connecting piece. Detailed Implementation
[0038] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.
[0039] This application discloses a retractable device for simultaneously measuring the length and width of a beam. (See also...) Figure 1 and Figure 2 The telescopic device that can simultaneously measure the length and width of the beam includes a connector 1, a crossbar 2, a vertical bar 3, and a telescopic bar 4.
[0040] like Figure 2 and Figure 3 As shown, connector 1 includes a back plate 11, two right-angle fixing blocks 12, and a connecting frame 14. The back plate 11 is vertically arranged, and the two right-angle fixing blocks 12 are inverted triangular in shape. The two right-angle fixing blocks 12 are mirrored on one side of the back plate 11. The tops of the two right-angle fixing blocks 12 are horizontally arranged and their end faces are flush. The tops of the two right-angle fixing blocks 12 are used to place the crossbar 2. The back plate 11 and the two right-angle fixing blocks 12 partially surround each other to form a receiving groove 13, which is used to receive the vertical bar 3.
[0041] Specifically, the backplate 11 is the basic structural component of the entire connector 1, used to provide a stable mounting base and spatial positioning for other components. The crossbar 2 is placed on top of the connector 1. The two right-angle fixing blocks 12 can support the crossbar 2 and limit the position of the crossbar 2 in the vertical direction. The receiving groove 13 formed by the two right-angle fixing blocks 12 can be inserted into the vertical bar 3, thereby providing guidance for the position of the vertical bar 3.
[0042] In this embodiment, the back plate 11 with the right-angle fixing block 12 is also provided with a connecting frame 14 for the vertical rod 3 to pass through. The connecting frame 14 is located at the end of the back plate 11 away from the right-angle fixing block 12. The connecting frame 14 is fixedly connected to the back plate 11 and is arranged opposite to the receiving groove 13. After one end of the vertical rod 3 passes through the receiving groove 13, it can pass into the connecting frame 14, thereby providing additional guidance and support for the vertical rod 3, limiting the horizontal position of the vertical rod 3 during the measurement process and limiting the state of the vertical rod 3, preventing the vertical rod 3 from tilting or swaying, thereby ensuring the accuracy and stability of the beam height measurement.
[0043] like Figure 4 As shown, the crossbar 2 is positioned on top of two right-angle fixing blocks 12, and the crossbar 2 abuts against the two right-angle fixing blocks 12. A through hole 21 is vertically opened on the crossbar 2, and the through hole 21 is positioned opposite to the receiving groove 13. The surface of the crossbar 2 is marked with graduations. The beam width can be measured through the graduations on the surface of the crossbar 2. The through hole 21 on the crossbar 2 allows the vertical rod 3 to pass through and move within the through hole 21. Thus, the abutment between the vertical rod 3 and the crossbar 2 restricts the horizontal position of the crossbar 2, ensuring the stability of the position of the crossbar 2 during the measurement process.
[0044] In this embodiment, a connecting ring 22 is provided on the side of the crossbar 2 near the two right-angle fixing blocks 12. The connecting ring 22 is provided with a first thread for detachable connection with the telescopic rod 4. The connecting ring 22 can provide a connection point for the crossbar 2 and the telescopic rod 4, so that the first thread can be detachably connected with the telescopic rod 4, providing a flexible connection method. The telescopic rod 4 can be quickly installed or disassembled according to actual needs, improving applicability and convenience. At the same time, the threaded connection method can ensure the firmness of the connection and prevent the telescopic rod 4 from loosening during use.
[0045] It should be noted that, in this embodiment, the position of the connecting ring 22 needs to be set according to actual needs, and no specific restrictions are placed on the position of the connecting ring 22 in this application. For example, the connecting ring 22 should be set at a position that ensures that the mass of the left and right sides of the horizontal bar 2 is the same after the horizontal bar 2 is connected to the vertical bar 3 and the connector 1. If the position of the connecting ring 22 cannot ensure that the mass of the left and right sides of the horizontal bar 2 is the same after the horizontal bar 2 is connected to the vertical bar 3 and the connector 1, then a counterweight can be added to the end of the horizontal bar 2 away from the connector 1 to ensure the stability of the telescopic device that can simultaneously measure the length and width of the beam during measurement.
[0046] like Figure 2 As shown, the vertical rod 3 can be movably inserted into the receiving groove 13 and the through hole 21, and the surface of the vertical rod 3 is provided with a scale; the beam height can be measured through the scale on the vertical rod 3, thereby ensuring measurement accuracy.
[0047] like Figure 2 and Figure 5 As shown, the telescopic rod 4 is vertically arranged and includes an inner tube 41 and an outer tube 42. The inner tube 41 is movably inserted into the outer tube 42. The outer wall of the inner tube 41 near the crossbar 2 is provided with a second thread. The end of the inner tube 41 away from the crossbar 2 is provided with a first limiting hole. An ejector block 43 is movably arranged in the first limiting hole. The inner wall of the inner tube 41 is provided with an elastic element 44 connected to the ejector block 43. The end of the outer tube 42 near the crossbar 2 is provided with a second limiting hole. The specifications of the second limiting hole are the same as those of the first limiting hole.
[0048] Specifically, please refer to Figure 5 and Figure 6 In this embodiment, the outer tube 42 can move relative to the inner tube 41, thereby extending the telescopic rod 4. After the telescopic rod 4 extends, the elastic element 44 drives the ejector block 43 to eject from the first limiting hole and position itself in the second limiting hole, so that the ejector block 43 abuts against the outer tube 42 and the inner tube 41, thereby limiting the position of the outer tube 42 relative to the inner tube 41, and thus limiting the length of the telescopic rod 4. The second thread on the outer wall of the inner tube 41 near the crossbar 2 can engage with the first thread in the connecting ring 22, realizing the connection between the inner tube 41 and the crossbar 2. The detachable connection of rod 2 enables the connection between telescopic rod 4 and horizontal rod 2. Telescopic rod 4 allows horizontal rod 2 and vertical rod 3 to abut against the beam. By moving telescopic rod 4, horizontal rod 2 and vertical rod 3 can be changed, ensuring that several beams can be measured quickly and improving measurement efficiency. The materials of the inner tube 41 and outer tube 42 of telescopic rod 4 need to be set according to actual needs. This application does not impose specific restrictions on the materials of the inner tube 41 and outer tube 42. For example, the inner tube 41 or outer tube 42 of telescopic rod 4 is a thin-walled hollow aluminum alloy tube or a polyvinyl chloride tube.
[0049] In the embodiments of this application, please refer to Figure 5A connecting piece 5 is provided on the outer wall of the outer tube 42. The connecting piece 5 is horizontally set on the outer wall of the outer tube 42 and is fixedly connected to the outer tube 42. A circular bubble level 6 is fixedly set on one side of the connecting piece 5. The horizontal setting of the connecting piece 5 on the outer wall of the outer tube 42 and its fixed connection to the outer tube 42 provide an installation base for the circular bubble level 6, so that the bubble level can be firmly installed and avoid loosening or falling off due to external forces. At the same time, the horizontal setting ensures the measurement accuracy of the bubble level. By observing the circular bubble level 6, the telescopic rod 4 can be adjusted, thereby adjusting the horizontal rod 2 and the vertical rod 3, improving the measurement accuracy. For example, the connecting piece 5 is an aluminum alloy sheet or a polyvinyl chloride sheet. The connecting piece 5 is fixedly connected to the outer tube 42 by materials or methods including but not limited to adhesives and / or welding. The connecting piece 5 is fixedly connected to the circular bubble level 6 by materials or methods including but not limited to adhesives and / or welding. The circular bubble level 6 is prior art and will not be described in detail in this application.
[0050] It should be noted that in this embodiment, both the vertical rod 3 and the horizontal rod 2 are square metal rods, the receiving groove 13 matches the vertical rod 3, and the connecting frame 14 is a rectangular frame. Compared with the round rod, the square rod design has higher structural strength and torsional resistance, and can better withstand external forces. At the same time, it reduces shaking during insertion and extraction, and improves the stability of the connection. The matching design of the receiving groove 13 and the vertical rod 3, as well as the design of the rectangular frame connecting frame 14, ensure the accurate guidance and stable support of the vertical rod 3, thereby ensuring the stability of the measurement of the horizontal rod 2 and the vertical rod 3.
[0051] Optionally, the vertical bar 3 and the horizontal bar 2 can be foldable bars formed by hinged connection of several metal bars, so as to facilitate storage or carrying.
[0052] As shown in Figure 7, the reset assembly 7 includes a first limiting post 71, a second limiting post 72, a third limiting post 73, and a connector 74. The first limiting post 71 and the second limiting post 72 are arranged side by side on the back plate 11 away from the receiving groove 13, and the third limiting post 73 is arranged on the side of the vertical rod 3 away from the receiving groove 13. The first limiting post 71, the second limiting post 72, and the third limiting post 73 are connected by the connector 74. The first limiting post 71 and the second limiting post 72 are arranged side by side on the back plate 11 away from the receiving groove 13, providing a force point for the connector 74. Through the third limiting post 73 and the connector 74, the position between the third limiting post 73 and the first and second limiting posts 72 is ensured, thereby ensuring the relative position of the vertical rod 3, realizing the rapid reset of the vertical rod 3, and ensuring that the vertical rod 3 can quickly return to its initial state.
[0053] Specifically, the connector 74 is an elastic rope loop, which is sleeved on the first limiting post 71, the second limiting post 72, and the third limiting post 73. The elastic rope loop has good elasticity. When the vertical rod 3 moves, the third limiting post 73 moves with the vertical rod 3 and drives the connector 74 to deform. After the vertical rod 3 moves without position restriction, the connector 74 returns to its original position, thereby driving the third limiting post 73 to reset through elastic tension. This ensures the relative position of the vertical rod 3, realizes the rapid reset of the vertical rod 3, and ensures that the vertical rod 3 can quickly return to its initial state, which is convenient for measuring multiple beams.
[0054] For example, in another embodiment of this application, please refer to Figure 8 The connector 74 is a thin rope with no stretch, with weights fixed at both ends. One end of the connector 74 passes through the first limiting post 71, the third limiting post 73, and the second limiting post 72 in sequence. After passing through the first limiting post 71, the third limiting post 73, and the second limiting post 72, the two ends of the connector 74 hang down naturally with the weights attached.
[0055] For example, in this embodiment of the application, the measuring personnel can first place the connector 1 on the ground, place the crossbar 2 and align the through hole 21 of the crossbar 2 with the receiving groove 13, and pass the end of the vertical rod 3 away from the third limiting post 73 through the connecting frame 14, the receiving groove 13 and the through hole 21 in sequence to assemble the connector 1, the crossbar 2 and the vertical rod 3; then hold the inner tube 41 and the outer tube 42, pull the outer tube 42 so that the ejector block 43 is located in the first limiting hole and the second limiting hole to complete the extension of the telescopic rod 4, and connect the crossbar 2 and the telescopic tube threadedly through the second thread of the inner tube 41 and the first thread of the connecting ring 22; finally, set the connector 74 on the first limiting post 71, the second limiting post 72 and the third limiting post 73 to complete the assembly of the telescopic device that can simultaneously measure the length and width of the beam.
[0056] For example, during use, the surveyor can hold the telescopic rod 4 and push it upwards, causing the horizontal bar 2 to move upwards and abut against the bottom of the beam. At this time, it is necessary to observe the circular bubble level 6 and adjust the position and state of the telescopic rod 4 to ensure that the horizontal bar 2 is in a horizontal state. Observe the relative position of the scales on the horizontal bar 2 and the vertical bar 3 with the beam to complete the measurement of the beam width and beam height. When the horizontal bar 2 moves upwards, the end of the vertical bar 3 away from the connector 1 abuts against the upper plate at the top of the beam. The horizontal bar 2 continues to move upwards. At this time, the connector 1 moves upwards relative to the vertical bar 3, and the connecting piece 74 deforms until the horizontal bar 2 abuts against the beam. After completing the measurement of the beam width and beam height, the surveyor can move the telescopic rod 4 downwards. At this time, the connecting piece 74 returns to its original position, thereby driving the vertical bar 3 to reset. Without manual reset, it can be quickly moved and the measurement of the next beam can be carried out.
[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A retractable device for simultaneously measuring the length and width of a beam, characterized in that, include: The connector (1) includes a back plate (11), one side of which is provided with two right-angle fixing blocks (12), the two right-angle fixing blocks (12) are mirrored, the back plate (11) and the two right-angle fixing blocks (12) partially surround to form a receiving groove (13), the top of the two right-angle fixing blocks (12) are horizontal and the end faces are flush; A crossbar (2) is set on the top of two right-angle fixing blocks (12) and abuts against the two right-angle fixing blocks (12). The crossbar (2) has a through hole (21) and the through hole (21) is opposite to the receiving groove (13). A telescopic rod (4) is detachably set on the side of the crossbar (2) near the two right-angle fixing blocks (12). The surface of the crossbar (2) is set with a scale. The vertical rod (3) is movably inserted into the receiving groove (13) and the through hole (21), and the surface of the vertical rod (3) is provided with a scale.
2. The apparatus of claim 1, wherein: The back plate (11) is provided with a right-angle fixing block (12) on one side, and a connecting frame (14) for the vertical rod (3) to pass through is also provided. The connecting frame (14) is located at the end of the back plate (11) away from the right-angle fixing block (12). The connecting frame (14) is fixedly connected to the back plate (11), and the connecting frame (14) is arranged opposite to the receiving groove (13).
3. The apparatus of claim 2, wherein: Both the vertical bar (3) and the horizontal bar (2) are square bars, the receiving groove (13) matches the vertical bar (3), and the connecting frame (14) is a rectangular frame.
4. The apparatus of claim 1, wherein: A connecting ring (22) is provided on the side of the crossbar (2) near the two right-angle fixing blocks (12), and the connecting ring (22) is provided with a first thread for detachable connection with the telescopic rod (4).
5. The apparatus of claim 4, wherein: The telescopic rod (4) is set vertically. The telescopic rod (4) includes an inner tube (41) and an outer tube (42). The inner tube (41) is movably inserted into the outer tube (42). The outer wall of the inner tube (41) near the crossbar (2) is provided with a second thread. The end of the inner tube (41) away from the crossbar (2) is provided with a first limiting hole. An ejector block (43) is movably provided in the first limiting hole. An elastic element (44) connected to the ejector block (43) is provided on the inner wall of the inner tube (41). The end of the outer tube (42) near the crossbar (2) is provided with a second limiting hole. The specifications of the second limiting hole are the same as those of the first limiting hole.
6. The apparatus of claim 5, wherein: A connecting piece (5) is provided on the outer wall of the outer tube (42). The connecting piece (5) is horizontally set on the outer wall of the outer tube (42). The connecting piece (5) is fixedly connected to the outer tube (42). A circular bubble level (6) is fixedly set on one side of the connecting piece (5).
7. The apparatus of claim 1, wherein: It also includes a reset assembly (7), which includes a first limiting post (71), a second limiting post (72), a third limiting post (73) and a connector (74). The first limiting post (71) and the second limiting post (72) are arranged side by side on the back plate (11) away from the receiving groove (13), and the third limiting post (73) is arranged on the vertical rod (3) away from the receiving groove (13). The first limiting post (71), the second limiting post (72) and the third limiting post (73) are connected by the connector (74).
8. The apparatus of claim 7, wherein: The connecting piece (74) is an elastic rope ring, and the connecting piece (74) is sleeved on the first limiting column (71), the second limiting column (72) and the third limiting column (73).