CN108318888A - Laser range finder and its signal element mounting bracket - Google Patents

Abstract

The invention relates to a laser distance measuring machine and a signal unit installation frame thereof. The signal unit of the laser rangefinder is installed on the installation arm and fixedly supported by the installation arm. The installation arm is distributed circumferentially around the joint. When the temperature changes in the environment, the length of the installation arm is much larger than its width, so that the installation arm The deformation of the mounting frame is mainly concentrated in its length direction, and the circumferential deformation of the mounting frame around the connecting part is very small, which avoids the circumferential rotation of the signal unit around the connecting part and ensures the position accuracy of the optical axis of the signal unit, thereby improving The measurement accuracy of the laser range finder.

Description

Laser distance measuring machine and its signal unit mounting frame

technical field

The invention relates to a laser distance measuring machine and a mounting frame for a signal unit thereof.

Background technique

The laser rangefinder mainly includes six parts: laser, transmitting antenna, receiving antenna, echo detector and supporting structure, in which the laser and transmitting antenna form the transmitting system, the receiving antenna and the echo detector form the receiving system, and the supporting structure is the transmitting system , The receiving system provides mechanical support and fixation of the relative position.

When working, the transmitting system irradiates the laser light on the target to be measured, and the receiving antenna converges the returned optical signal to the echo detector. The angle between the optical axis of the receiving system and the transmitting system should be as small as possible to ensure the The effective light energy of the receiving system is the largest.

In the traditional rangefinder, because the effective size of the echo detector is relatively large, the field of view of the receiving system can reach a large angle, and the field of view of the transmitting antenna is small, allowing the deviation between the two to be about ±0.35mrad. For the support structure, the requirements are relatively low, and the requirements can be met without special design. For example, a laser rangefinder disclosed in a Chinese patent document with the authorized announcement number CN 206387904 U includes a base and a rangefinder housing arranged on the base. The rangefinder housing includes a bottom wall, a side wall and a signal unit. The signal unit includes a laser transmitter and a laser receiver. Both the laser transmitter and the laser receiver are installed on the front side wall. The effective size of the echo detector of this rangefinder is relatively large, and the viewing angle of the receiving system It can be larger, the field of view of the transmitting antenna is smaller, and the deviation between the two is allowed to be about ±0.35mrad, which requires lower precision. The support structure mentioned above can meet the precision requirements.

For the single-photon laser range finder, the detection mechanism is different from the traditional range finder: the single-photon range finder relies on the single-photon event of the returned light to calculate the detection distance. For traditional laser range finders, in order to increase the amount of incoming light, the field of view of the receiving system is usually larger than the optical axis of the transmitting system. For single-photon laser range finders, in order to reduce the impact of background light, the field of view of the receiving system must (θ ₁ ) should be equal to or smaller than the field of view (θ ₂ ) of the transmitting system, and the deviation between the two is allowed to be about ±50μrad. At this time, due to the large size of the traditional support structure, under the influence of external stress, especially When the ambient temperature changes, a large deformation will occur, which will deflect the optical axis of the transmitting system and the receiving system on the supporting structure, and affect the measurement accuracy of the laser range finder.

Contents of the invention

The object of the present invention is to provide a laser range finder signal unit mounting frame to solve the problem of low measurement accuracy of the laser range finder caused by the deformation of the supporting structure of the existing laser range finder due to the influence of temperature; at the same time, the invention also provides A laser distance measuring machine using the above installation frame.

In order to achieve the above object, the mounting bracket for the laser distance measuring machine of the present invention adopts the following technical scheme:

Technical scheme 1 of the mounting frame for the laser rangefinder: the signal unit mounting frame of the laser rangefinder, including the mounting frame body, the mounting frame body including a connecting part for connecting with the base of the laser rangefinder, the connection There are more than three installation arms distributed around its circumference, and each installation arm is respectively provided with a connecting structure for fixing and supporting the signal unit. The signal unit of the laser rangefinder is installed on the installation arm and fixedly supported by the installation arm. The installation arm is distributed circumferentially around the joint. When the temperature changes in the environment, the length of the installation arm is much larger than its width, so that the installation arm The deformation of the mounting frame is mainly concentrated in its length direction, and the circumferential deformation of the mounting frame around the connecting part is very small, which avoids the circumferential rotation of the signal unit around the connecting part, ensures the position accuracy of the optical axis of the signal unit, and improves The measurement accuracy of the laser range finder.

The technical solution 2 of the mounting frame for the laser rangefinder is further improved on the basis of the technical solution 1 of the mounting frame for the laser rangefinder: the length of the mounting arms is the same and evenly distributed around the circumference of the connecting part, ensuring The uniform deformation around the connecting portion further improves the installation accuracy of the optical axis of the signal unit.

The technical solution 3 of the mounting frame for the laser rangefinder is further improved on the basis of the technical solution 1 or 3 of the mounting frame for the laser rangefinder: the mounting arm has a fixed end for connecting with the connecting part and a The overhanging end of the connection structure is provided, and the installation arm extends obliquely upward from the fixed end to the overhanging end.

Laser distance measuring machine of the present invention adopts following technical scheme:

Technical solution 1 of the laser range finder: the laser range finder, including a base, a signal unit and a signal unit mounting frame, the signal unit mounting frame includes a mounting frame body, and the mounting frame body includes a The connecting portion connected to the machine base has more than three mounting arms distributed around the connecting portion, and each mounting arm is respectively provided with a connecting structure for fixing and supporting the signal unit. The signal unit of the laser rangefinder is installed on the installation arm and fixedly supported by the installation arm. The installation arm is distributed circumferentially around the joint. When the temperature changes in the environment, the length of the installation arm is much larger than its width, so that the installation arm The deformation of the mounting frame is mainly concentrated in its length direction, and the circumferential deformation of the mounting frame around the connecting part is very small, which avoids the circumferential rotation of the signal unit around the connecting part, ensures the position accuracy of the optical axis of the signal unit, and improves The measurement accuracy of the laser range finder.

The technical solution 2 of the laser rangefinder is further improved on the basis of the technical solution 1 of the laser rangefinder: the installation arm is evenly distributed around the circumference of the connecting part, which ensures uniform deformation around the connecting part and further improves the Mounting accuracy of the optical axis of the signal unit.

The technical solution 3 of the laser rangefinder is further improved on the basis of the technical solution 1 or 2 of the laser rangefinder: the mounting arm has a fixed end for connecting with the connecting part and a fixed end for setting the connecting structure The cantilever end, the installation arm extends obliquely upward from the fixed end to the cantilever end.

The technical solution 4 of the laser rangefinder is further improved on the basis of the technical solution 3 of the laser rangefinder: the overhanging end of the mounting arm is provided with an upwardly extending boss, and the boss has a The upper end surface of the unit support fits, and the connection structure includes a threaded hole arranged on the boss.

The technical solution 5 of the laser rangefinder is further improved on the basis of the technical solution 3 of the laser rangefinder: the mounting arm gradually becomes thinner from the fixed end to the overhanging end.

The technical solution 6 of the laser rangefinder is further improved on the basis of the technical solution 1 or 2 of the laser rangefinder: the signal unit includes a transmitting unit and a receiving unit, and the transmitting unit is installed on the on the base.

The technical solution 7 of the laser rangefinder is further improved on the basis of the technical solution 1 or 2 of the laser rangefinder: there are three mounting arms.

Description of drawings

Fig. 1 is the structural representation of the transmitting unit in the embodiment 1 of laser distance finder of the present invention;

Fig. 2 is the structural representation of the receiving unit in embodiment 1 of the laser distance measuring machine of the present invention;

Fig. 3 is the schematic structural view of the mounting frame of the transmitting unit in the embodiment 1 of the laser range finder of the present invention;

Fig. 4 is the side view of Fig. 3;

Figure 5 is a schematic diagram of the assembly of the launch unit and the mounting frame;

Fig. 6 is the schematic structural view of the base in embodiment 1 of the laser distance measuring machine of the present invention;

Figure 7 is a top view of Figure 6;

In the drawings: 1. Transmitting unit; 2. Receiving unit; 3. Mounting frame; 4. Base; 11. Mounting plate; 21. Receiving lens; 22. Supporting surface; 31. Mounting arm; 32. Connecting part; 33. Mounting surface; 41, launching unit mounting platform; 42, reference platform; 43, receiving unit mounting platform; 44, first cantilever; 45, second cantilever.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

A specific embodiment 1 of the laser range finder of the present invention, as shown in FIGS. In this embodiment, the laser range finder is a single photon laser range finder. The transmitting unit 1 is installed on the base 4 through the installation frame 3 , and the receiving unit 2 is provided with a supporting surface 22 and is directly installed on the base 4 .

The structure of the launch unit 1 is shown in Figure 1. The launch unit 1 has a square structure as a whole. The outer circumference of the launch unit 1 is provided with three mounting plates 11 extending outwards. The three mounting plates 11 are all provided with mounting holes. The holes are used for bolts to pass through to fasten the mounting plate 11 on the corresponding mounting surface.

The structure of the mounting frame 3 of the transmitting unit 1 is shown in Figures 3 and 4, the mounting frame 3 includes a mounting frame body, the mounting frame body includes a connecting portion 32 for connecting with the laser base 4, and the connecting portion 32 is in the shape of a truncated cone . More than three mounting arms 31 are evenly distributed around the connecting portion 32 around its circumference. In this embodiment, there are three mounting arms 31 and the lengths of the three mounting arms 31 are the same. The end of each mounting arm 31 is provided with a mounting surface 33 for mounting the transmitting unit, and the position of each mounting surface 33 corresponds to the mounting plate 11 of the transmitting unit one by one. The mounting surface 33 is provided with a connecting structure for connecting the transmitting unit. In this embodiment, the connecting structure is a threaded hole arranged on the mounting surface, and the mounting arm has a fixed end for connecting with the connecting portion and for setting the At the overhanging end of the connection structure, the installation arm extends obliquely upward from the fixed end to the overhang end, thus improving the structural strength of the installation frame. After installation, as shown in Figure 5, the bolts pass through the mounting holes on the mounting plate and are fastened into the threaded holes on the mounting surface, thereby fastening and fixing the transmitting unit and the mounting frame.

The structure of the receiving unit 2 is shown in FIG. 2 , including a base body, the receiving lens 21 is arranged on the side of the base body, and the bottom of the base body is provided with a supporting surface 22 for direct connection with the base 4 .

When the temperature of the external environment changes, the transmitting unit and the mounting frame will deform to a certain extent under the action of temperature stress. For the mounting frame in the present invention, the main deformation of each mounting arm 31 is reflected in each length direction On the other hand, that is, the main deformations all extend radially outward along the connecting portion 32, and the deformation amounts of the mounting arms 31 around the connecting portion cancel each other out, thus avoiding the deformation of the mounting frame so that the transmitting unit on the mounting frame will wrap around the connecting portion. The circumferential rotation ensures the position accuracy of the optical axis of the transmitting unit, thereby improving the measurement accuracy of the laser distance measuring machine.

The structure of the base 4 of the laser rangefinder is shown in Figure 6 and Figure 7, the base 4 is in the shape of a strip as a whole, the base 4 includes a reference platform 42 for installation and fixing, and the bottom surface of the reference platform 42 is a reference surface for installation . There are two cantilevers extending to both sides above the reference platform 42 , namely a first cantilever 44 and a second cantilever 45 . The two cantilever arms are respectively used to install the transmitting unit and the receiving unit 2. Specifically, the first cantilever 44 is provided with a transmitting unit mounting platform 41 for installing the transmitting unit, and the second cantilever 45 is provided with a receiving unit for installing the receiving unit 2. Mounting table 43. Both mounting tables have an upward mounting surface for mounting the transmitting unit and the receiving unit.

The length of the first cantilever 44 and the length of the second cantilever 45 are specifically set according to the weight of the transmitting unit and the receiving unit, so that the base 4 becomes a seesaw structure. When the temperature changes, the amount of change and the direction of change at the two ends of the two cantilevers are consistent. The transmitting unit and the receiving unit on the two cantilevers can only translate in the vertical direction, and there will be no rotational deformation around the reference table, which ensures the parallelism between the optical axes of the transmitting unit and the receiving unit, thereby improving The detection accuracy of the laser range finder.

Specific embodiment 2 of the laser rangefinder of the present invention, in this embodiment, the mounting frame of the transmitting unit is provided with four mounting arms, certainly, in other implementations, the number of mounting arms can also be set to five according to design requirements , six, seven, or other numbers, the others are the same as those in the embodiment and will not be repeated here.

Specific embodiment 3 of the laser distance measuring machine of the present invention, in this embodiment, the mounting frame is used as the mounting frame of the receiving unit, and the others are the same as the embodiment, and will not be repeated here.

Specific embodiment 4 of the laser range finder of the present invention, in this embodiment, each mounting arm is distributed in a Y shape around the connecting portion, of course, in other embodiments, the angle between each mounting arm can also be changed as required , the others are the same as those in the embodiment, and will not be repeated here.

Specific embodiment 5 of the laser range finder of the present invention, in this embodiment, a stud is provided at the cantilevered end of the mounting arm, and is fixedly connected to the signal unit through the stud.

In the embodiment of the laser rangefinder signal unit mounting frame of the present invention, the structure of the laser rangefinder signal unit mounting frame is the same as that of the above laser rangefinder embodiment, and will not be repeated here.

Claims (10)

1. laser range finder signal element mounting bracket, it is characterised in that：Including mounting bracket frame body, the mounting bracket frame body includes using In the interconnecting piece being connect with laser ranging machine base, the interconnecting piece around its it is circumferentially distributed there are three above installing arms, it is each to pacify The connection structure that support is fixed with signal element is respectively provided on dress arm.

2. laser range finder signal element mounting bracket according to claim 1, it is characterised in that：The installation arm lengths phase It is uniformly distributed together and circumferentially around the interconnecting piece.

3. laser range finder signal element mounting bracket according to claim 1 or 2, it is characterised in that：The installing arm tool It is useful for the fixing end being connect with interconnecting piece and the projecting end for the connection structure to be arranged, installing arm self-retaining end Extension is tilted upward to projecting end.

4. laser range finder, including pedestal, signal element and signal element mounting bracket, it is characterised in that：The signal element Mounting bracket includes mounting bracket frame body, and the mounting bracket frame body includes the interconnecting piece for being connect with laser ranging machine base, described Interconnecting piece is circumferentially distributed there are three above installing arm around its, is respectively provided in each installing arm and signal element is fixed and supported Connection structure.

5. laser range finder according to claim 4, it is characterised in that：The installing arm is circumferentially uniform around the interconnecting piece Distribution.

6. laser range finder according to claim 4 or 5, it is characterised in that：The installing arm, which has, to be used for and interconnecting piece The fixing end of connection and projecting end for the connection structure to be arranged, installing arm self-retaining end is tilted towards to projecting end Upper extension.

7. laser range finder according to claim 6, it is characterised in that：The projecting end of the installing arm is equipped with and upwardly extends Boss, the boss have for signal element support cooperation upper surface, the connection structure include be arranged described Threaded hole on boss.

8. laser range finder according to claim 6, it is characterised in that：Installing arm self-retaining end is gradual to projecting end Attenuate.

9. laser range finder according to claim 4 or 5, it is characterised in that：The signal element include transmitter unit and Receiving unit, the transmitter unit are installed on the base by the mounting bracket.

10. laser range finder according to claim 4 or 5, it is characterised in that：There are three the installing arm is set.