Moment limiter based on laser and wireless communication composite distance measurement and engineering equipment

Abstract

The utility model discloses a moment limiter based on laser and wireless communication composite distance measurement and engineering equipment, and belongs to the technical field of high-altitude engineering machinery. The device comprises a tilt angle sensor used for measuring the tilt angle of the suspension arm to the ground, a laser ranging assembly used for measuring the length of the suspension arm, a pressure transmitter used for measuring the telescopic hydraulic value of the suspension arm, and a controller used for receiving signals of the tilt angle sensor, the laser ranging assembly and the pressure transmitter, the control assembly is used for receiving a signal and determining the moment of the suspension arm according to the received signal; the wireless distance measuring assembly comprises a wireless transmitter and a wireless receiver; the wireless transmitter and the wireless receiver are installed at the two opposite ends of the suspension arm, the wireless receiver is in signal connection with the wireless transmitter and the control assembly, and the wireless receiver is used for determining the distance between the wireless receiver and the wireless transmitter according to received signals of the wireless transmitter. The wireless distance measuring assembly and the laser distance measuring assembly achieve double guarantee of arm length distance measurement of the suspension arm, and moment judgment errors are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to high altitude engineering machinery technical field especially based on laser and wireless communication composite ranging's torque limiter and engineering equipment. BACKGROUND

[0002] Torque limiter is used for monitoring the real-time working state of hoisting equipment, and will give an alarm and prevent the operator from further dangerous operation when the working torque approaches or exceeds the rated torque, and is a necessary safety product for hoisting equipment.

[0003] The existing torque limiter is influenced by the linear growth error of length sensor and the flexible deformation of the boom, and the comprehensive calculation error is easy to exceed 5% required by the standard, based on the above problems, the length of the boom can be measured by the principle of laser ranging, so that the error is controlled in millimeter level, however, in the outdoor sunlight irradiation, dust and mist environment, the refraction and scattering of laser exist, which makes the ranging unstable, finally leading to large torque judgment error of torque limiter. SUMMARY

[0004] The utility model provides a kind of torque limiter and engineering equipment based on laser and wireless communication composite ranging, to solve the problem of inaccurate ranging in prior art, to reduce the torque judgment error of torque limiter.

[0005] The utility model provides a kind of torque limiter based on laser and wireless communication composite ranging in the first aspect, for installing on the boom of hoisting equipment, package laser ranging assembly, for measuring the pressure transmitter of boom telescopic hydraulic value, and for receiving the signal of the inclination sensor, the laser ranging assembly and the pressure transmitter, and according to the signal received, the control component of boom torque is determined;

[0006] Further comprising:

[0007] Wireless ranging assembly includes wireless transmitter and wireless receiver;The wireless transmitter and the wireless receiver are installed at opposite ends of the boom, and the wireless receiver is signal connected with the wireless transmitter, the control component, and the wireless receiver is used to determine the distance between the wireless receiver and the wireless transmitter according to the signal received by the wireless transmitter.

[0008] In some embodiments of the first aspect, the laser ranging assembly includes a swing assembly and a laser range finder;

[0009] The laser range finder is installed on the swing assembly, and the laser head of the laser range finder is directed to the arm head of the boom.

[0010] The swing assembly is installed on the boom, and the swing assembly drives the laser range finder to swing on the boom to form a communication light path between the laser range finder and a boom head of the boom.

[0011] In some embodiments of the first aspect, the swing assembly comprises a mounting support, a crank linkage mechanism and a protective shell.

[0012] The mounting support is installed on the boom.

[0013] The protective shell is hinged to the mounting support, and the protective shell is provided with an inclination sensor for measuring the inclination angle of the boom to the ground, a length sensor for measuring the length of the boom, the laser range finder is arranged in the protective shell, and a laser through hole is arranged on the protective shell for the laser of the laser range finder to pass through.

[0014] One end of the crank linkage mechanism is connected to the mounting support, and the other end of the crank linkage mechanism is hinged to the protective shell.

[0015] In some embodiments of the first aspect, the crank linkage mechanism comprises a driving motor, a crank rod and a swing rod.

[0016] The driving motor is signal-connected to the control assembly, the driving motor is installed on the mounting support, an output shaft of the driving motor is in transmission connection with one end of the crank rod, the other end of the crank rod is hinged to the swing rod, and the other end of the swing rod is hinged to the protective shell.

[0017] In some embodiments of the first aspect, the crank linkage mechanism further comprises a speed reducer, and the driving motor is in transmission connection with the crank rod through the speed reducer.

[0018] In some embodiments of the first aspect, the outer periphery of the protective shell is covered with a light shielding member.

[0019] In some embodiments of the first aspect, the laser ranging assembly further comprises a light-reflecting plate, the light-reflecting plate is arranged at the end of the boom, and the light-reflecting plate faces the laser range finder.

[0020] In some embodiments of the first aspect, the wireless ranging assembly further comprises a photovoltaic member, the photovoltaic member is arranged on the boom, and the photovoltaic member is electrically connected to the wireless transmitter and / or the wireless receiver.

[0021] In some embodiments of the first aspect, the wireless transmitter is an ultra-wideband transmitter, and the wireless receiver is an ultra-wideband receiver.

[0022] The second aspect of the utility model provides an engineering equipment, comprising:

[0023] An engineering equipment body.

[0024] The torque limiter of the first aspect is mounted on a boom of the engineering equipment body.

[0025] From the above technical solutions, the utility model has the following advantages:

[0026] The embodiment provides a torque limiter based on laser and wireless communication composite ranging, since the torque limiter comprises a laser ranging assembly and a wireless ranging assembly, the laser ranging assembly can determine the arm length of the boom, and the wireless transmitter and the wireless receiver of the wireless ranging assembly are installed at opposite ends of the boom; the wireless receiver can determine the arm length of the boom by receiving the signal of the wireless transmitter; in cooperation with the laser ranging assembly, double protection of boom arm length ranging is realized; even if the torque limiter is used in an outdoor sunlight irradiation, dust and mist environment, the wireless ranging assembly can still perform boom arm length ranging, so that torque judgment error is reduced, and the problem of inaccurate ranging in the prior art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0028] Figure 1 A torque limiter provided by the embodiment of the utility model is mounted on the structure diagram of engineering equipment;

[0029] Figure 2 A structure diagram of the swing assembly provided by the embodiment of the utility model;

[0030] Figure 3 A structure diagram of the crank connecting rod mechanism provided by the embodiment of the utility model.

[0031] Reference signs:

[0032] 1, tilt sensor; 2, laser ranging assembly; 20, swing assembly; 200, mounting support; 201, crank connecting rod mechanism; 2010, drive motor; 2011, crank rod; 2012, swing rod; 2013, bracket; 2014, shaft coupling; 2015, bearing; 2016, flange; 2017, rotating shaft; 2018, ear seat; 202, protective shell; 2020, light shielding piece; 21, laser range finder; 22, reflector; 3, pressure transmitter; 4, control assembly; 5, wireless ranging assembly; 50, wireless transmitter; 51, wireless receiver; 6, engineering equipment body; 60, jib; 600, basic arm. DETAILED DESCRIPTION

[0033] The utility model embodiment provides a torque limiter and engineering equipment based on laser and wireless communication composite ranging, and is used for solving the technical problem of inaccurate ranging in prior art.

[0034] In order to make the utility model purposes, features, advantages more obvious and easy to understand, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment, obviously, the following described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor are within the protection scope of the utility model.

[0035] Please refer to Figures 1 to 3 The utility model provides a torque limiter based on laser and wireless communication composite ranging, is used for installing on the jib 60 of hoisting equipment, comprising:

[0036] Tilt sensor 1 is used for measuring the inclination of jib 60 to the ground;

[0037] Laser ranging assembly 2 is used for measuring the arm length of jib 60;

[0038] Pressure transmitter 3 is used for measuring the telescopic hydraulic value of jib 60;

[0039] Wireless ranging assembly 5 includes wireless transmitter 50 and wireless receiver 51; wireless transmitter 50 and wireless receiver 51 are installed at opposite ends of jib 60, wireless receiver 51 is signal connected with wireless transmitter 50 and control assembly 4, wireless receiver 51 is used for determining the distance between wireless receiver 51 and wireless transmitter 50 according to the signal received by wireless transmitter 50;

[0040] The control component 4 is connected with the inclination sensor 1, the laser ranging component 2, the pressure transmitter 3 and the wireless receiver 51, and is used for receiving the signals of the inclination sensor 1, the laser ranging component 2 and the pressure transmitter 3, and determining the moment of the boom 60 according to the received signals.

[0041] In the working process of the embodiment, the moment limiter is installed on the boom 60 of the hoisting equipment, and the components are started, the inclination sensor 1 measures the inclination of the boom 60 (the angle between the boom 60 and the horizontal plane), the laser ranging component 2 measures the arm length of the boom 60, the pressure transmitter 3 measures the telescopic hydraulic value of the boom 60, the wireless receiver 51 is used for determining the distance between the wireless receiver 51 and the wireless transmitter 50 according to the received signal of the wireless transmitter 50, so as to measure the arm length of the boom 60, and the control component 4 receives the inclination of the boom 60, the arm length and the telescopic hydraulic value of the boom 60, and determines the lifting weight and the working radius according to the data, and then judges whether the moment of the boom 60 is in the over-limit condition.

[0042] In the above working process, the arm length of the boom 60 can be measured in two ways, one is laser ranging, and the other is wireless ranging. The combination of the two ranging methods can ensure that the moment limiter can accurately measure the arm length of the boom 60, and even when the laser ranging is affected by the environment, the wireless ranging can be used as a backup to ensure the accuracy and stability of the moment judgment of the moment limiter during the operation process, and the safety of the project is improved.

[0043] Compared with the prior art, the measurement of the arm length of the boom 60 in the embodiment is more accurate and less affected by external environment. That is, when the light of the laser ranging component 2 may be scattered and refracted to make the measurement unstable, or even lose data, the wireless ranging component 5 can keep measuring the boom 60, and the obtained ranging data can be used as the basis for determining the moment, so as to prevent the operation accuracy of the moment limiter from being affected by unstable data during the operation process, and improve the safety of the moment limiter.

[0044] In a specific embodiment, as shown in Figure 1 and Figure 2As shown, further provided is an implementable structure of the laser ranging assembly 2, which comprises the swing assembly 20 and the laser range finder 21; the laser range finder 21 is installed on the swing assembly 20, and the laser head of the laser range finder 21 faces the arm head of the boom 60; the swing assembly 20 is installed on the boom 60, and the swing assembly 20 drives the laser range finder 21 to swing on the boom 60, so that the laser range finder 21 forms a communication light path with the arm head of the boom 60; in a specific implementation, after the laser range finder 21 emits laser, the laser range finder 21 swings under the driving of the swing assembly 20, so that the laser range finder 21 forms a communication light path with the arm head of the boom 60, that is, the laser of the laser range finder 21 hits the arm head of the boom 60 and returns to the laser range finder 21, forming a reciprocating communication light path, and the laser range finder 21 analyzes and measures the arm length of the boom 60 by analyzing the time length of the laser emission and the laser return.

[0045] After the swing assembly 20 and the laser range finder 21 are adopted, the laser range finder 21 measures the boom 60 according to the laser ranging principle, the precision can reach the millimeter level, and the deformation error caused by the deformation of the boom 60 under load can be avoided through the laser swing mechanism, and the overall precision is improved.

[0046] It should be pointed out that the installation position of the swing assembly 20 is relatively various, and the swing assembly 20 can be installed on the lower edge of the basic arm 600 of the boom 60, at this time, the distance measured by the laser is the extension arm length of the boom 60, and the extension arm length plus the length of the basic arm 600 is the length of the entire boom 60; of course, the swing assembly 20 can also be installed at the hinged end of the boom 60, that is, the root of the boom 60, at this time, the distance measured by the laser is the complete length of the boom 60.

[0047] In an embodiment, the laser range finder 21 can be any one of a pulse laser range finder 21, a phase laser range finder 21 and a triangulation laser range finder 21, and other devices that can realize laser ranging can also be selected by those skilled in the art, and here is not described too much.

[0048] In an embodiment, as shown in Figure 2 and Figure 3As shown, the swing assembly 20 includes a mounting support 200, a crank linkage mechanism 201, and a protective housing 202; the mounting support 200 is mounted on the boom 60; the protective housing 202 is hinged to the mounting support 200, the laser range finder 21 is arranged in the protective housing 202, and the protective housing 202 is provided with a laser through hole through which the laser of the laser range finder 21 passes; one end of the crank linkage mechanism 201 is connected to the mounting support 200, and the other end of the crank linkage mechanism 201 is hinged to the protective housing 202; in specific implementation, the crank linkage mechanism 201 can drive the protective housing 202 and the laser range finder 21 in it to swing in a direction close to the boom 60 or a direction away from the boom 60, so that the laser range finder 21 can form a communication light path with the boom head of the boom 60.

[0049] Compared with the existing technology using a telescopic rod, the present embodiment has the following advantages after using the crank linkage mechanism 201: first, the structure is simple and reliable, the crank rocker structure is simple and mainly composed of a crank, a connecting rod and a rocker, so the failure rate is low and the maintenance is convenient, which is suitable for long-term use; second, the motion control is accurate, the crank rocker can convert rotary motion into linear or reciprocating motion, and the motion trajectory is predictable, which is suitable for applications that require accurate control. By adjusting the length of the crank or the angle of the connecting rod, the motion range and speed can be flexibly changed; third, the efficiency is high, the energy transmission efficiency of the crank rocker is high, which is suitable for scenes that require high-efficiency power transmission. The structure design reduces friction loss, further improving the efficiency; fourth, the safety is high, the crank rocker runs stably and is not easy to fail suddenly, so the safety is high. The motion trajectory and speed are easy to control, reducing the risk of accidents; fifth, the space occupation is small, the crank rocker structure is compact, which is suitable for environments with limited space.

[0050] In the present embodiment, as shown in Figure 2 and Figure 3 , the mounting support 200 includes a bracket 2013 for mounting the driving motor 2010 and an ear seat 2018 for mounting the crank linkage mechanism 201.

[0051] In the present embodiment, as shown in Figure 2 and Figure 3As shown, the crank linkage mechanism 201 comprises a driving motor 2010 for signal connection with the control assembly 4, a crank rod 2011 and a swing rod 2012; one end of the crank rod 2011 is mounted on the lug seat 2018 of the mounting support 200 through the cooperation of a rotating shaft 2017, a bearing 2015 and a flange 2016, the driving motor 2010 is mounted on the mounting support 200 through a support 2013, the output shaft of the driving motor 2010 is in driving connection with the rotating shaft 2017 of one end of the crank rod 2011 through a shaft coupling 2014 to realize torque transmission, so that the crank rod 2011 can rotate relative to the lug seat 2018; the other end of the crank rod 2011 is hinged to the swing rod 2012, the other end of the swing rod 2012 is hinged to the protective shell 202; in specific implementation, the control assembly 4 drives the driving motor 2010 to start, and drives the crank rod 2011 to rotate relative to the lug seat 2018, the rotation of the crank rod 2011 drives the swing rod 2012 to rotate, and the rotation of the swing rod 2012 drives the protective shell 202 to swing, that is, the rotation of the crank linkage mechanism 201 can make the laser range finder 21 in the protective shell 202 swing repeatedly to realize the angle coverage of the laser line at the end of the arm head, and when the load deformation is borne by the boom 60, the reflector plate 22 can still be irradiated by the laser range finder.

[0052] It should be noted that the ranging range of the laser range finder is far up to dozens of meters, and the rotation amount of the crank linkage mechanism 201 can amplify the movement amount of the reflection point on one side of the reflector plate 22, so the driving motor 2010 adopts a type with high resolution and good micro-control property (such as a stepper motor and a servo motor), in order to make the movement of the laser range finder 21 more stable and strengthen the movement control ability of the laser range finder 21, the crank linkage mechanism 201 further comprises a speed reducer; the driving motor 2010 is in driving connection with the crank rod 2011 through the speed reducer, and the speed reducer is built in the driving motor 2010; in specific implementation, the setting of the speed reducer can further improve the resolution, so that the micro-control property of the crank linkage mechanism 201 is good, the movement of the laser point is more stable, and the combination of the micro-control motor and the speed reducer makes the swing resolution of the laser range finder higher and the speed more stable, and the laser point stays on the reflector plate 22 for a longer time in movement, which is beneficial to the feedback of light.

[0053] In the embodiment, as shown in Figure 2 The outer periphery of the protective shell 202 is covered with a light shielding member 2020, for example, the light shielding member 2020 can be black velvet, which is arranged on the inner wall and the outer wall of the protective shell 202; in specific implementation, the light shielding member 2020 can weaken and absorb the light irradiated by outdoor sunlight, so as to avoid the interference of the laser range finder 21 caused by sunlight irradiation.

[0054] Based on the above embodiment, as shown in Figure 2As shown, in order to shield the oblique direct sunlight, the length of the protective shell 202 is greater than the laser range finder 21, and in a specific implementation, the excess length of the protective shell 202 becomes the upper edge shielding part of the range finder, effectively shielding the oblique direct sunlight.

[0055] In an embodiment, as shown in Figure 1 As shown, the laser ranging assembly 2 further comprises a reflector 22, which is arranged at the end of the boom 60, i.e., the reflector 22 is protruding outside the arm head of the boom 60, and the reflector 22 is facing the laser range finder 21. In a specific implementation, the reflector 22 can strengthen the light reflecting capability of the laser range finder 21, so that stable ranging can be achieved within a range of tens of meters even in outdoor sunlight or rainy and foggy weather.

[0056] In a specific embodiment, as shown in Figure 1 As shown, a wireless ranging assembly 5 is further provided, which comprises a wireless transmitter 50, a wireless receiver 51, and a photovoltaic panel. The wireless transmitter 50 is installed on the arm head, the wireless receiver 51 is installed at the arm root of the boom 60, i.e., at the rear hinge point of the boom 60, and the photovoltaic panel is electrically connected with the wireless transmitter 50 and / or the wireless receiver 51. In a specific implementation, the photovoltaic panel absorbs solar energy to convert it into electrical energy to power the wireless transmitter 50 and / or the wireless receiver 51. When the working environment encounters strong sunlight, dust, and fog, the light of the laser range finder may be scattered and refracted, causing unstable measurement. In this case, the data of the boom 60 measured by the wireless ranging can be used as an auxiliary parameter to temporarily participate in the calculation, so as to prevent the working accuracy of the torque limiter from being affected by unstable data during the operation, and to improve the safety of the torque limiter.

[0057] In an embodiment, the wireless transmitter 50 is an ultra-wideband transmitter, and the wireless receiver 51 is an ultra-wideband receiver. The distance between the two points is measured through wireless communication between the ultra-wideband transmitter and the ultra-wideband receiver. In a specific implementation, after the ultra-wideband receiver and the ultra-wideband transmitter adopt the ultra-wideband technology (UWB, Ultra Wide Band), the ultra-wideband technology transmits data by sending and receiving extremely narrow pulses with nanosecond or even picosecond levels. These pulses have a very wide frequency spectrum range, usually occupying a bandwidth of several GHz. Unlike traditional sinusoidal carrier-based communication technologies, the ultra-wideband technology does not need to use a carrier to modulate the signal, but directly uses the time position, amplitude, or polarity of the pulse to encode information.

[0058] The composite ranging form is adopted, the main ranging is laser ranging, and the auxiliary ranging is UWB ranging. When the laser ranging is affected by the environment, the UWB ranging can be switched to, so as to ensure the stability of the torque limiter during the operation, and the safety is improved.

[0059] In a specific embodiment, as shown in Figure 1As shown, further provided is an implementable structure of the tilt sensor 1, which is installed on the base arm 600 of the boom 60 and can measure the tilt angle of the boom 60 with the ground as a reference after calibration.

[0060] In the embodiment, the tilt sensor 1 can be a static tilt sensor 1 or a dynamic tilt sensor 1, which can be selected by those skilled in the art according to actual needs.

[0061] In a specific embodiment, as shown in Figure 1 As shown, further provided is an implementable structure of the pressure transmitter 3 for measuring the telescopic hydraulic value of the boom 60; the pressure transmitter 3 detects the cavity pressure by connecting the circuits of the rodless cavity and the rod cavity of the lifting cylinder, and the thrust of the lifting cylinder can be calculated by combining the parameters of the lifting cylinder.

[0062] In a specific embodiment, as shown in Figure 1 As shown, further provided is an implementable structure of the control component 4, which can be a Lift Plan 3D, Crane View, etc. The Lift Plan 3D software controller is a software specially designed for the lifting operation of engineering equipment, which has a built-in model database of various engineering equipment; the user only needs to input basic parameters such as cylinder thrust, boom 60 angle and length, and the software can quickly calculate the lifting weight and working radius, and automatically judge whether the moment under the current working condition exceeds the rated range of the engineering equipment. At the same time, the software can also generate detailed lifting plans and reports; the Crane View software controller focuses on the operation and monitoring simulation of engineering equipment, which can calculate the lifting weight, working radius and moment in real time according to the input engineering equipment parameters and working condition information, and display them in an intuitive graphical interface. If the moment is out of limit, the software will issue a warning in time.

[0063] Of course, the control component 4 can also have built-in mechanical formulas to calculate the lifting weight and working radius of the engineering equipment through the cylinder pressure, boom 60 tilt angle and boom 60 length, and the moment can be determined in combination with the principles of mechanics and geometry, and the following are the basic steps:

[0064] S1, determine the known parameters, including: cylinder pressure (P): the pressure provided by the hydraulic system, boom 60 tilt angle (θ): the angle between the boom 60 and the horizontal plane, boom 60 length (L): the total length of the boom 60, cylinder acting force (F): calculated by the cylinder pressure and piston area, formula F=P×A, where A is the piston area.

[0065] S2, calculate the lifting weight (W)

[0066] The lifting weight is related to the cylinder force, the boom 60 inclination angle, and the boom 60 length. Assuming the boom 60 is rigid and ignoring friction, the lifting weight can be calculated by moment balance:

[0067] W x L x cos(θ) = F x L x sin(θ)

[0068] After simplifying:

[0069] W = F x tan(θ)

[0070] In the above formula, W is the lifting weight, F is the cylinder force, and θ is the boom 60 inclination angle.

[0071] S3, Calculate the working radius (R)

[0072] The working radius is the horizontal distance from the end of the boom 60 to the center of rotation of the engineering equipment, which can be calculated by the boom 60 length and inclination angle:

[0073] R = L x cos(θ)

[0074] In the above formula, R is the working radius of the boom 60, L is the length of the boom 60, and θ is the inclination angle of the boom 60.

[0075] S4, Consider actual factors

[0076] Mechanical efficiency: In actual calculation, the mechanical efficiency (η) needs to be considered, and the formula is modified to W = F x tan(θ) x η.

[0077] Safety factor: To ensure safety, the calculation result should be multiplied by the safety factor.

[0078] Other loads: such as wind load, inertial load, etc. also need to be considered.

[0079] In some examples, assuming the cylinder pressure P = 20 MPa, the piston area A = 0.01 m2, the boom 60 length L = 20 m, the boom 60 inclination angle , the mechanical efficiency η = 0.9, the calculation through the above steps is:

[0080] Cylinder force: F = P x A = 20 x 106 x 0.01 = 200,000 N;

[0081] Lifting weight: ;

[0082] Working radius: ;

[0083] Further, the calculated lifting weight and working radius are compared with the preset values to determine whether the moment is over limit.

[0084] Please refer toFigure 1 , Figure 1 Figure 1 A kind of engineering equipment provided in the second aspect of the utility model embodiment, comprising:

[0085] Engineering equipment body 6, for example, crane and other equipment;

[0086] Torque limiter, torque limiter is installed on the boom 60 of engineering equipment body 6.

[0087] In the specific working process of the embodiment, the torque limiter can be directly installed on the engineering equipment body 6, and the torque limiter can measure the cylinder force, the boom 60 inclination angle and the boom 60 length, so as to determine the working radius and the lifting weight, and further determine whether the torque of the engineering equipment body 6 is over-limit, compared with the prior art, the engineering equipment body 6 in the embodiment is less modified, only needs to be installed at the corresponding position to complete, and the promotion is strong.

[0088] The above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

[0089] Finally, it also needs to be pointed out that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

Claims

1. A torque limiter based on laser and wireless communication composite ranging, used for being installed on a boom of a hoisting device, comprising a tilt sensor for measuring a tilt angle of the boom to the ground, a laser ranging assembly for measuring a boom length of the boom, a pressure transmitter for measuring a telescopic hydraulic value of the boom, and a control assembly for receiving signals of the tilt sensor, the laser ranging assembly and the pressure transmitter, and determining a boom torque according to the received signals; characterized in that Further comprising: a wireless ranging assembly comprising a wireless transmitter and a wireless receiver; the wireless transmitter and the wireless receiver are installed on opposite ends of the boom, the wireless receiver is in signal connection with the wireless transmitter and the control assembly, and the wireless receiver is used for determining a distance between the wireless receiver and the wireless transmitter according to a signal received by the wireless transmitter.

2. The torque limiter of claim 1, wherein The laser ranging assembly comprises a swing assembly and a laser range finder; The laser range finder is installed on the swing assembly, and a laser head of the laser range finder faces a boom head of the boom; The swing assembly is installed on the boom, and the swing assembly drives the laser range finder to swing on the boom so as to form a communication light path between the laser range finder and the boom head.

3. The torque limiter of claim 2, wherein, The swing assembly comprises a mounting support, a crank linkage mechanism and a protective shell; The mounting support is installed on the boom; The protective shell is hinged to the mounting support, the laser range finder is arranged in the protective shell, and a laser through hole is arranged on the protective shell for the laser of the laser range finder to pass through; One end of the crank linkage mechanism is connected to the mounting support, and the other end of the crank linkage mechanism is hinged to the protective shell.

4. The torque limiter of claim 3, wherein The crank linkage mechanism comprises a driving motor, a crank rod and a swing rod; The driving motor is in signal connection with the control assembly, the driving motor is installed on the mounting support, an output shaft of the driving motor is in transmission connection with one end of the crank rod, the other end of the crank rod is hinged to the swing rod, and the other end of the swing rod is hinged to the protective shell.

5. The torque limiter of claim 4, wherein, The crank linkage mechanism further comprises a speed reducer; the driving motor and the crank rod are in transmission connection through the speed reducer.

6. The torque limiter of claim 3, wherein, An outer periphery of the protective shell is covered with a light shielding member.

7. The torque limiter of claim 2, wherein, The laser ranging assembly further comprises a reflecting plate, the reflecting plate is arranged at an end of the boom, and the reflecting plate faces the laser range finder.

8. The torque limiter of claim 1, wherein, The wireless ranging assembly further comprises a photovoltaic member, the photovoltaic member is arranged on the boom, and the photovoltaic member is in electrical connection with the wireless transmitter and / or the wireless receiver.

9. The torque limiter according to claim 1 or 8, characterized in that The wireless transmitter is an ultra-wideband transmitter, and the wireless receiver is an ultra-wideband receiver.

10. An engineering apparatus characterised by Further comprising: an engineering equipment body; the torque limiter according to any one of claims 1 to 9, which is installed on a boom of the engineering equipment body.

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