Laser range finder for building steel structure construction

Abstract

The invention belongs to the technical field of building steel structure construction, and particularly relates to a laser range finder for building steel structure construction, the laser range finder comprises a range finder shell and an outer dustproof protection assembly, the surface of the range finder shell is provided with operation keys and a display screen, and the top of the range finder shell is provided with a detector receiving mirror and a laser light source; a left positioning groove is formed in the left side of the range finder shell, a right positioning groove is formed in the right side of the range finder shell, and a range finding circuit is arranged in the range finder shell. The situation that dust covers the detector receiving mirror and the laser light source and interferes the detector receiving mirror and the laser light source during working can be avoided, and meanwhile the situation that the detection structure is inaccurate due to the fact that detection light is affected by strong light can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of building steel structure construction, and particularly relates to a laser rangefinder for building steel structure construction. Background Art

[0002] In the construction of building steel structures, there are strict standards for the distance between steel materials. If there is an error, it may cause the project to fail the acceptance and will have a great impact on the quality of the project. Therefore, it is necessary to use a laser distance meter to strictly detect the distance between steel materials.

[0003] A laser rangefinder is an instrument that uses a certain parameter of modulated laser to measure the distance to a target. Handheld laser rangefinders are currently the most widely used laser rangefinders.

[0004] However, there is a lot of dust at the construction site of the building steel structure, and the spacing between the steel frame structures is small. When using the laser rangefinder for measurement, there are the following problems: 1. The surface of the laser rangefinder, especially the display screen, laser light source and detector receiving mirror, is prone to accumulate a lot of dust. When the dust accumulates too much, it will affect the propagation and reception of the laser, thereby reducing the accuracy of the laser rangefinder; 2. When measuring outdoors, when the sunlight is strong, it will interfere with the collection of infrared light by the receiving lens, thus affecting the measurement accuracy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a laser rangefinder for building steel structure construction in view of the shortcomings of the prior art. The present invention can prevent dust from covering the detector receiving mirror and the laser light source and causing interference to the detector receiving mirror and the laser light source during operation, and can also prevent the detection light from being affected by strong light and causing inaccurate detection of the structure.

[0006] To achieve the above object, the present invention provides the following technical solutions: a laser rangefinder for building steel structure construction, comprising a rangefinder housing and an outer dust protection component, the surface of the rangefinder housing is equipped with operation buttons and a display screen, the top of the rangefinder housing is respectively equipped with a detector receiving mirror and a laser light source, the left side of the rangefinder housing is provided with a left positioning groove, the right side of the rangefinder housing is provided with a right positioning groove, and a rangefinder housing is provided with a distance measuring circuit; The outer dust isolation protection assembly includes a right side protection seat, a left side protection seat, a sealing seat, an upper plug-in interface, a lower plug-in interface and a short-distance light-shielding track. The right side protection seat and the left side protection seat are respectively installed on both sides of the rangefinder housing. The left side protection seat includes a protective cover fixedly covering the side wall of the rangefinder housing. The top of the protective cover is fixedly connected to the sealing seat. The sealing seat is plugged into the interior of the upper plug-in interface. The upper plug-in interface is provided at the top of the rangefinder housing. A detector receiving mirror and a laser light source are arranged inside the upper plug-in interface. The lower plug-in interface is provided at the bottom of the rangefinder housing. The short-distance shading track includes a limit plate, an upper baffle plate, a guide piece, a shading seat and a guide groove. The bottom of the limit plate is fixedly connected to the upper baffle plate, the bottom of the upper baffle plate is fixedly connected to the guide piece, and the guide groove is arranged on the surface of the shading seat.

[0007] Preferably, the right side protection seat and the left side protection seat have the same structure and are symmetrically arranged with respect to the rangefinder housing, and the cross-sections of the right side protection seat and the left side protection seat are both L-shaped structures.

[0008] Preferably, the left positioning groove and the right positioning groove have the same structure and are symmetrically arranged about the rangefinder housing, and the left protective seat is inserted into the interior of the left positioning groove, and the right protective seat is inserted into the interior of the right positioning groove.

[0009] Preferably, two sets of parallel front positioning grooves are provided on the front of the rangefinder housing, and two sets of parallel back positioning grooves are provided on the back of the rangefinder housing. The inner side surface of the shield is fixedly connected to the positioning seat, and the positioning seat can be plugged into and matched with the front positioning groove and the back positioning groove.

[0010] Preferably, the shield is an L-shaped acrylic shield, and the shield is plugged into the internal rangefinder of the front positioning groove through the positioning seat and is in a protective state; the shield is plugged into the internal rangefinder of the rear positioning groove through the positioning seat and is in a working state.

[0011] Preferably, the right side protection seat and the left side protection seat are provided with receiving holes inside, the light shielding seat is inserted into the receiving holes, and the sizes of the receiving holes and the light shielding seat are matched.

[0012] Preferably, the ranging circuit includes a transmitting circuit, a laser driver and a semiconductor photodiode, a single-chip microcomputer is installed on the left side of the transmitting circuit, a measuring chip is arranged at the bottom of the single-chip microcomputer, and a receiving circuit is installed on the right side of the measuring chip; the single-chip microcomputer is electrically connected to the measuring chip, and signals are transmitted between the measuring chip and the receiving circuit through wires, the measuring chip is TDC-GP2, and the light emitted by the laser light source and the light received by the detector receiving mirror are shielded by a short-distance shading track.

[0013] Preferably, the output voltage formula of the semiconductor photodiode is: ; ; in: is the sum of the photocurrent and the dark current. =100kΩ, =100μA, the output voltage is =10V; The signal bandwidth formula is: BW= ,like =5pF, the signal bandwidth is 0.32M.

[0014] Preferably, the guide groove is adapted to the size of the guide piece, the guide piece is arranged in two groups at the bottom of the limiting plate, and the maximum shading distance after the upper shielding plate and the shading seat are unfolded is 30 cm.

[0015] Preferably, the detector receiving mirror consists of an isolation plate, a mounting seat, a receiving mirror body and a micro-stepping motor. The interior of the detector receiving mirror is fixedly mounted with the receiving mirror body via the mounting seat, the surface of the receiving mirror body is covered with an isolation plate, the end of the isolation plate is movably connected to the inner wall of the detector receiving mirror via a rotating shaft, the rotating shaft at the end of the isolation plate is fixedly connected to the output shaft of the micro-stepping motor, and the micro-stepping motor is mounted on the outside of the detector receiving mirror; a T-shaped seat is installed on the back of the rangefinder housing, a disassembly seat is clamped on the outside of the T-shaped seat, and a double-ring finger hole is welded on the outside of the disassembly seat.

[0016] Beneficial effects of the present invention: 1. When the rangefinder is not in use, the protective cover is placed on the display screen, and the sealing seat at the top of the protective cover is sealed inside the upper plug interface, so as to protect and isolate the detector receiving mirror and the laser light source from dust, thereby preventing dust from covering the detector receiving mirror and the laser light source and interfering with the detector receiving mirror and the laser light source during operation; 2. The arrangement of the upper shielding plate and the light shielding seat in the present invention can shield the laser emitted by the laser light source and the light received by the detector receiving mirror, thereby preventing the detection light from being affected by strong light and causing inaccurate detection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view structural schematic diagram of a specific embodiment of the present invention; Figure 2 for Figure 1 Side view of Figure 3 It is a schematic diagram of the structure in which the left side protection seat covers the back of the rangefinder in the present invention; Figure 4 for Figure 1 AA cross-sectional structure diagram; Figure 5 It is a partial cross-sectional structural schematic diagram of the rangefinder housing in the present invention; Figure 6 It is a schematic diagram of the structure of the short-distance shading track of the present invention; Figure 7 It is a schematic diagram of the structure of the short-distance shading track of the present invention when it is retracted; Figure 8 is a working block diagram of the ranging circuit in the present invention; Fig. 9 It is a schematic diagram of the installation structure of the double ring finger hole in the present invention; Fig.10 It is a schematic diagram of the internal structure of the detector receiving mirror in the present invention.

[0018] In the figure: 1. Rangefinder housing; 111. T-shaped seat; 112. Disassembly seat; 113. Double ring finger hole; 11. Operation button; 12. Display screen; 13. Left positioning slot; 14. Right positioning slot; 15. Detector receiving mirror; 151. Isolation plate; 152. Mounting seat; 153. Receiving mirror body; 154. Micro stepping motor; 16. Laser light source; 17. Distance measurement circuit; 171. Transmitting circuit; 172. Laser driver; 173. Semiconductor photodiode; 174. Single chip microcomputer; 175, measuring chip; 176, receiving circuit; 2, outer dust protection assembly; 20, right protection seat; 200, left protection seat; 21, protective cover; 22, positioning seat; 23, front positioning groove; 231, back positioning groove; 24, sealing seat; 25, upper plug-in interface; 26, lower plug-in interface; 27, short-distance shading track; 271, limit plate; 272, upper baffle plate; 273, guide plate; 274, shading seat; 275, guide groove; 276, receiving hole. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods and in conjunction with the accompanying drawings.

[0020] See also Figure 1-10 A laser rangefinder for building steel structure construction includes a rangefinder housing 1 and an outer dust protection component 2. The surface of the rangefinder housing 1 is equipped with an operation button 11 and a display screen 12. The top of the rangefinder housing 1 is respectively equipped with a detector receiving mirror 15 and a laser light source 16. The left side of the rangefinder housing 1 is provided with a left positioning groove 13, the right side of the rangefinder housing 1 is provided with a right positioning groove 14, and a distance measuring circuit 17 is arranged inside the rangefinder housing 1; The outer dust protection assembly 2 includes a right protection seat 20, a left protection seat 200, a sealing seat 24, an upper plug-in interface 25, a lower plug-in interface 26 and a short-distance shading track 27. The right protection seat 20 and the left protection seat 200 are respectively installed on both sides of the rangefinder housing 1. The left protection seat 200 includes a protective cover 21 fixedly covering the side wall of the rangefinder housing 1. The top of the protective cover 21 is fixedly connected to the sealing seat 24. The sealing seat 24 is plugged into the interior of the upper plug-in interface 25. The upper plug-in interface 25 is opened at the top of the rangefinder housing 1. The interior of the upper plug-in interface 25 is provided with a detector receiving mirror 15 and a laser light source 16. The lower plug-in interface 26 is opened at the bottom of the rangefinder housing 1.

[0021] The short-distance shading track 27 includes a limit plate 271, an upper baffle plate 272, a guide piece 273, a shading seat 274 and a guide groove 275. The bottom of the limit plate 271 is fixedly connected to the upper baffle plate 272, the bottom of the upper baffle plate 272 is fixedly connected to the guide piece 273, and a guide groove 275 is provided on the surface of the shading seat 274.

[0022] When in use, the shield 21 is removed from the rangefinder and installed on the back of the rangefinder, and the distance between the steel structures is detected through the detector receiving mirror 15, the laser light source 16 and the internal distance measuring circuit 17.

[0023] When the rangefinder is not in use, the protective cover 21 covers the display screen 12, and the sealing seat 24 on the top of the protective cover 21 is sealed inside the upper plug-in interface 25, which can protect and isolate the detector receiving mirror 15 and the laser light source 16 from dust, preventing dust from covering the detector receiving mirror 15 and the laser light source 16 and affecting the working accuracy of the detector receiving mirror 15 and the laser light source 16.

[0024] The right side protection seat 20 and the left side protection seat 200 have the same structure and are symmetrically arranged about the rangefinder housing 1, and the cross-sections of the right side protection seat 20 and the left side protection seat 200 are both L-shaped structures. The right side protection seat 20 and the left side protection seat 200 are made of hard rubber. When the two sides of the rangefinder touch the ground, the right side protection seat 20 and the left side protection seat 200 will be elastically deformed, thereby providing buffer protection for the rangefinder.

[0025] The left positioning groove 13 and the right positioning groove 14 have the same structure and are symmetrically arranged with respect to the rangefinder housing 1. The left protection seat 200 is inserted into the left positioning groove 13, and the right protection seat 20 is inserted into the right positioning groove 14. The right protection seat 20 and the left protection seat 200 are positioned and installed through the right positioning groove 14 and the left positioning groove 13 opened on both sides of the rangefinder housing 1, so as to ensure the stability of the right protection seat 20 and the left protection seat 200 when working.

[0026] like Figure 1-4As shown in the figure, the front and back sides of the rangefinder housing 1 are respectively provided with a front positioning groove 23 and a back positioning groove 231. Specifically, the front side of the rangefinder housing 1 is provided with two groups of parallel front positioning grooves 23, and the back side of the rangefinder housing 1 is provided with two groups of parallel back positioning grooves 231. The front positioning grooves 23 and the back positioning grooves 231 can limit the shield 21 and the mounting components thereon. The inner side of the shield 21 is fixedly connected with the positioning seat 22, and the positioning seat 22 can be plugged and matched with the front positioning groove 23 and the back positioning groove 231. When the positioning seat 22 on the shield 21 is plugged into the inside of the front positioning groove 23, the shield 21 and the sealing seat 24 can protect the display screen 12, the detector receiving mirror 15 and the laser light source 16. When the display screen 12, the detector receiving mirror 15 and the laser light source 16 are working, the positioning seat 22 on the shield 21 is plugged into the inside of the back positioning groove 231.

[0027] The shield 21 is an L-shaped acrylic shield, and when the positioning seat 22 is inserted into the front positioning groove 23, the shield 21 is in a state of protecting the rangefinder. The shield 21 covers the display screen 12, and can protect the display screen 12 to prevent hard objects from hitting the display screen 12 and causing damage to the display screen 12. When the positioning seat 22 is inserted into the rear positioning groove 231, the protection of the shield 21 on the rangefinder is released, and the rangefinder is in a working state.

[0028] like Figure 6-7 As shown: the right side protection seat 20 and the left side protection seat 200 are both provided with a receiving hole 276, and the inside of the receiving hole 276 is plugged with a light shielding seat 274, and the receiving hole 276 is adapted to the size of the light shielding seat 274. The distance between the upper shielding plate 272 and the light shielding seat 274 can be adjusted by the guide plate 273. The setting of the upper shielding plate 272 and the light shielding seat 274 can block the laser emitted by the laser light source 16 and the light received by the detector receiving mirror 15, so as to avoid the detection light being affected by strong light and causing inaccurate detection results.

[0029] The ranging circuit 17 includes a transmitting circuit 171, a laser driver 172 and a semiconductor photodiode 173. A single-chip microcomputer 174 is installed on the left side of the transmitting circuit 171, a measuring chip 175 is arranged at the bottom of the single-chip microcomputer 174, and a receiving circuit 176 is installed on the right side of the measuring chip 175; the single-chip microcomputer 174 is electrically connected to the measuring chip 175, and signals are transmitted between the measuring chip 175 and the receiving circuit 176 through wires. The measuring chip 175 is TDC-GP2, and the light emitted by the laser light source 16 and the light received by the detector receiving mirror 15 are shielded by a short-distance shading track 27.

[0030] The output voltage formula of the semiconductor photodiode 173 is: ; ; in: is the sum of the photocurrent and the dark current. =100kΩ, =100μA, the output voltage is =10V; The signal bandwidth formula is: BW= ,like =5pF, signal bandwidth is 0.32M; like Figure 8 As shown: By choosing and By adjusting the value of , an appropriate bandwidth can be obtained, which can effectively suppress the noise outside the bandwidth range and meet all aspects of the design requirements of the rangefinder front-end channel.

[0031] In the above formula: is the output voltage; R2 is the operational amplifier feedback resistor, Photocurrent refers to the current caused by light radiation. When a semiconductor photodiode is irradiated by light, the electrons in its valence band absorb the energy of photons and jump to the conduction band, generating electron-hole pairs. These carriers move under the action of the electric field to form current. Dark current refers to the tiny amount of current generated by the diode in the absence of light. is the sum of the photocurrent and the dark current, BW is the signal bandwidth, π is the circumference of a circle, is the diode capacitance.

[0032] The guide groove 275 is adapted to the size of the guide piece 273. The guide piece 273 is arranged in two groups at the bottom of the limiting plate 271. The maximum shading distance of the upper shielding plate 272 and the shading seat 274 after unfolding is 30 cm.

[0033] There is friction between the guide groove 275 and the guide piece 273. Through this friction, the upper baffle plate 272 and the light-shielding seat 274 can be stably connected, and the upper baffle plate 272 and the light-shielding seat 274 will not move relative to each other when they are stationary.

[0034] The detector receiving mirror 15 includes an isolation plate 151, a mounting seat 152, a receiving mirror body 153 and a micro-stepping motor 154. The receiving mirror body 153 is fixedly mounted inside the detector receiving mirror 15 through the mounting seat 152. The surface of the receiving mirror body 153 is covered with the isolation plate 151. The end of the isolation plate 151 is movably connected to the inner wall of the detector receiving mirror 15 through a rotating shaft. The rotating shaft at the end of the isolation plate 151 is fixedly connected to the output shaft of the micro-stepping motor 154. The micro-stepping motor 154 is installed on the outside of the detector receiving mirror 15. A T-shaped seat 111 is installed on the back of the rangefinder housing 1, and a disassembly seat 112 is clamped on the outside of the T-shaped seat 111. A double-ring finger hole 113 is welded on the outside of the disassembly seat 112.

[0035] like Figure 9-10 As shown: the micro-stepping motor 154 is electrically connected to the controller inside the rangefinder. When the switch of the rangefinder is turned on, the controller detects this signal and turns on the micro-stepping motor 154, so that the isolation plate 151 rotates 90°. The isolation plate 151 no longer blocks the receiving mirror body 153, so that the receiving mirror body 153 can work normally; when the rangefinder is not in use, the isolation plate 151 covers the surface of the receiving mirror body 153 to protect the receiving mirror body 153 from dust.

[0036] like Figure 9-10 As shown, by inserting fingers into the double-ring finger holes 113, the distance meter can be held by the fingers without the need to hold the distance meter with the whole hand, so that the values ​​detected by the distance meter can be recorded in writing with both hands.

[0037] Technical features not described in the present invention can be implemented by existing technologies and will not be described in detail here. The present invention is not limited to the above specific embodiments, and changes, modifications, additions or substitutions made by ordinary technicians in the field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A laser rangefinder for use in building steel structure construction, comprising a rangefinder housing (1) and an outer dust shielding component (2), wherein an operation button (11) and a display screen (12) are mounted on the surface of the rangefinder housing (1), and a detector receiving mirror (15) and a laser light source (16) are mounted on the top of the rangefinder housing (1), characterized in that: The rangefinder housing (1) has a left positioning groove (13) on the left side and a right positioning groove (14) on the right side; The outer dust isolation protection component (2) comprises a right side protection seat (20), a left side protection seat (200), a sealing seat (24), an upper plug interface (25), a lower plug interface (26) and a short distance light shielding track (27). The right side protection seat (20) and the left side protection seat (200) are respectively mounted on two sides of the rangefinder housing (1). The left side protection seat (200) comprises a protective cover (21) fixedly covering the side wall of the rangefinder housing (1). The top of the protective cover (21) is fixedly connected to the sealing seat (24). The sealing seat (24) is plugged into the interior of the upper plug interface (25). The upper plug interface (25) is provided at the top of the rangefinder housing (1). A detector receiving mirror (15) and a laser light source (16) are arranged inside the upper plug interface (25). The lower plug interface (26) is provided at the bottom of the rangefinder housing (1). The short-distance light-shielding track (27) comprises a limit plate (271), an upper baffle plate (272), a guide piece (273), a light-shielding seat (274) and a guide groove (275); the bottom of the limit plate (271) is fixedly connected to the upper baffle plate (272); the bottom of the upper baffle plate (272) is fixedly connected to the guide piece (273); and the guide groove (275) is provided on the surface of the light-shielding seat (274).

2. The laser rangefinder for building steel structure construction according to claim 1, characterized in that: The right side protection seat (20) and the left side protection seat (200) have the same structure and are symmetrically arranged with respect to the rangefinder housing (1), and the cross-sections of the right side protection seat (20) and the left side protection seat (200) are both L-shaped structures.

3. The laser rangefinder for building steel structure construction according to claim 2, characterized in that: The left positioning groove (13) and the right positioning groove (14) have the same structure and are symmetrically arranged with respect to the rangefinder housing (1), and the left protection seat (200) is inserted into the interior of the left positioning groove (13), and the right protection seat (20) is inserted into the interior of the right positioning groove (14).

4. The laser rangefinder for building steel structure construction according to claim 3, characterized in that: The front side of the rangefinder housing (1) is provided with two groups of parallel front positioning grooves (23), and the back side of the rangefinder housing (1) is provided with two groups of parallel back positioning grooves (231). The inner side surface of the shield (21) is fixedly connected to the positioning seat (22), and the positioning seat (22) can be plugged into and matched with the front positioning groove (23) and the back positioning groove (231).

5. The laser rangefinder for building steel structure construction according to claim 4, characterized in that: The shield (21) is an L-shaped acrylic shield, and the shield (21) is plugged into the front positioning groove (23) through the positioning seat (22), and the internal distance meter is in a protective state; the shield (21) is plugged into the rear positioning groove (231) through the positioning seat (22), and the internal distance meter is in a working state.

6. The laser rangefinder for building steel structure construction according to claim 5, characterized in that: The right side protection seat (20) and the left side protection seat (200) are both provided with a receiving hole (276) inside, the light shielding seat (274) is inserted into the receiving hole (276), and the size of the receiving hole (276) is matched to that of the light shielding seat (274).

7. The laser rangefinder for building steel structure construction according to claim 6, characterized in that: The distance measuring circuit (17) comprises a transmitting circuit (171), a laser driver (172) and a semiconductor photodiode (173); a single chip microcomputer (174) is installed on the left side of the transmitting circuit (171); a measuring chip (175) is arranged at the bottom of the single chip microcomputer (174); and a receiving circuit (176) is installed on the right side of the measuring chip (175); the single chip microcomputer (174) and the measuring chip (175) are electrically connected; signals are transmitted between the measuring chip (175) and the receiving circuit (176) via wires; the measuring chip (175) is a TDC-GP2; light emitted by the laser light source (16) and light received by the detector receiving mirror (15) are shielded by a short-distance light shielding track (27).

8. A laser rangefinder for building steel structure construction according to claim 7, characterized in that: The output voltage formula of the semiconductor photodiode (173) is: ； ； The signal bandwidth formula is: .

9. The laser rangefinder for building steel structure construction according to claim 8, characterized in that: The guide groove (275) is matched to the size of the guide piece (273); the guide piece (273) is arranged in two groups at the bottom of the limit plate (271); and the maximum shading distance of the upper shielding plate (272) and the shading seat (274) after being unfolded is 30 cm.

10. The laser rangefinder for building steel structure construction according to claim 9, characterized in that: The detector receiving mirror (15) comprises an isolating plate (151), a mounting seat (152), a receiving mirror body (153) and a micro-stepping motor (154); the receiving mirror body (153) is fixedly mounted inside the detector receiving mirror (15) via the mounting seat (152); the surface of the receiving mirror body (153) is covered with the isolating plate (151); the end of the isolating plate (151) is movably connected to the inner wall of the detector receiving mirror (15) via a rotating shaft; the rotating shaft at the end of the isolating plate (151) is fixedly connected to the output shaft of the micro-stepping motor (154); and the micro-stepping motor (154) is mounted on the outside of the detector receiving mirror (15); a T-shaped seat (111) is mounted on the back of the rangefinder housing (1); the disassembly seat (112) is clamped on the outside of the T-shaped seat (111); and the outer side of the disassembly seat (112) is welded with a double ring finger hole (113).

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