Device for crane load inspection

Abstract

The utility model discloses a device for crane load inspection, and relates to the technical field of cranes. The connecting shell is mounted at a position, close to a crane driving source, in the crane; the linkage part is fixed outside the assembly part and is used for acquiring the rotating force of the driving source; the heat dissipation part is installed between the assembly part and the linkage part, and convection heat dissipation is conducted on the joint through the centrifugal effect generated by rotating force; and the sensor assembly is integrated at the position, away from the crane driving source, outside the connecting shell and calculates the crane load by obtaining the rotation angle / rotation speed data of the linkage piece. According to the utility model, redundant detection is formed through the photoelectric encoder and the Hall sensor of the sensor assembly according to the obtained power of the position of the driving source of the crane and by means of the transmission characteristic of the linkage piece, so that detection errors caused by failure of a single sensor are effectively avoided; the problem that a traditional force sensor is directly installed at a steel cable and is prone to being damaged by impact is avoided.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, specifically to a device for crane load testing. Background Technology

[0002] Lifting machinery is widely used, diverse in type, and numerous in quantity. Every year, there are safety accidents related to lifting machinery in various places, causing casualties and property losses. In order to strengthen the management of the use of lifting machinery and reduce its failure rate and accident rate, a device for crane load testing is needed.

[0003] A search revealed that Chinese utility model patent with publication number "CN212960625U" discloses "a portable device for macroscopic inspection of lifting machinery". This application uses a motor to drive a cleaning brush to clean dust, which makes it easier for inspectors to identify the nameplate of the machinery through a camera. Furthermore, a second micro motor drives a second gear and a first gear to adjust the angle of the cleaning brush, making the cleaning angle adjustable and thus making the inspection work more convenient.

[0004] However, in actual use, although the above-mentioned device can make the detection work more convenient, some force measuring units in the existing device are directly installed on the surface of the lifting steel cable for mechanical data acquisition. These force measuring units are prone to fatigue of the sensor elastomer metal under long-term alternating load impact, resulting in zero-point drift or permanent deformation, which affects the detection accuracy to a certain extent. Utility Model Content

[0005] The purpose of this invention is to provide a device for inspecting the load of a crane, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An apparatus for inspecting crane loads, comprising:

[0008] Connect the housing and install it inside the crane near the crane's drive source;

[0009] Linkage components are fixed outside the assembly and obtain rotational power from the drive source;

[0010] The heat dissipation component is installed between the assembly and the linkage, and uses the centrifugal effect generated by rotation to implement convective heat dissipation at the connection.

[0011] The sensor assembly is integrated outside the connecting housing, away from the crane drive source, and calculates the crane load by acquiring the rotation angle / speed data of the linkage.

[0012] The linkage component includes:

[0013] The transmission rod is inserted and installed at the central axis of the connecting housing. One end is connected to a coupling component that matches the type of crane drive source, and the other end passes through the bottom of the connecting housing and is fixed with a turntable. The surface of the turntable is provided with a detection groove for the sensor assembly to record.

[0014] The sensor assembly sends pulse signals to the crane control console based on the frequency of the detection grooves appearing on the turntable. The control console obtains the rotation angle / speed data of the drive source based on the pulse signals and calculates the crane load.

[0015] As a further preferred embodiment of this technical solution, the connecting housing includes:

[0016] The transparent mesh shell has a shield installed around its opening to protect the coupling element. The edge of the transparent mesh shell away from the opening is combined with the sensor assembly, and the detection end of the sensor assembly faces the surface of the turntable.

[0017] As a further preferred embodiment of this technical solution, the outer periphery of the mesh shell near the sensor assembly is designed with a hollowed-out design, while the other outer periphery of the mesh shell is designed with a semi-open design;

[0018] A transmission gear is fixed to the outside of the transmission rod at a semi-open position on the periphery of the mesh shell. The transmission gear is used to provide rotational power to the heat dissipation component.

[0019] As a further preferred embodiment of this technical solution, the heat dissipation component includes:

[0020] The transfer cylinder has its opening facing the periphery of the permeable mesh shell. A flow guide nozzle is fixed on the outside of the transfer cylinder facing the coupling member. The flow guide nozzle is connected to the inside of the transfer cylinder.

[0021] The internal rotating part of the transfer cylinder is connected to a servo gear that is compatible with the transmission gear, and a turbine fan blade is integrated at the center of the servo gear;

[0022] As the transmission gear operates, the servo gear rotates and, according to the turbine fan blades, guides the gas outside the mesh shell to the interior of the transfer cylinder, and discharges it along the guide nozzle.

[0023] As a further preferred embodiment of this technical solution, an assembly arm is fixed to the outside of the connecting housing, and a harness for binding near the crane drive source is inserted inside the assembly arm.

[0024] As a further preferred embodiment of this technical solution, the sensor assembly includes a photoelectric encoder and a Hall sensor, wherein the laser emitting end of the photoelectric encoder is aligned with the movement trajectory of the detection groove, and the magnetic probe of the Hall sensor extends to the axial surface of the transmission rod.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] This device for crane load testing obtains the power of the crane drive source position and uses the transmission characteristics of the linkage to form redundant detection through the photoelectric encoder and Hall sensor of the sensor assembly. This effectively avoids detection errors caused by the failure of a single sensor and avoids the problem of traditional force sensors being easily damaged by impact when directly installed on the steel cable.

[0027] In addition, the airflow driven by the turbine blades forms an annular air curtain at the coupling, which can not only achieve continuous heat dissipation of the transmission components, but also prevent external dust from entering the precision detection area. Attached Figure Description

[0028] Figure 1 This is an isometric drawing of the present invention;

[0029] Figure 2 This is a diagram showing the bottom structure of this utility model;

[0030] Figure 3 This is a front sectional view of the present invention;

[0031] Figure 4 This is a diagram showing the internal structure of the transfer cylinder of this utility model.

[0032] In the diagram: 1. Shielding cover; 2. Through-mesh shell; 3. Detection groove; 4. Turntable; 5. Gathering belt; 6. Assembly arm; 7. Transfer cylinder; 8. Guide nozzle; 9. Coupler; 10. Transmission gear; 11. Transmission rod; 12. Servo gear; 13. Sensor assembly; 14. Turbine fan blade; 15. Sleeve rod; 16. Connecting notch. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Before understanding the technical solution proposed in this application, it is important to understand that the crane control console uses the following principle to calculate the crane load during actual testing.

[0035] Specifically, the output torque T of the crane drive source (hoisting mechanism) motor It is necessary to overcome the load torque T load and frictional torque T friction That is: T motor =Tload +T friction The relationship between the load torque and the load mass m is T load =m·g·r eff Where g is the acceleration due to gravity, with a reference value of 9.81 m / s². 2 r eff The equivalent transmission radius, in this application, is the radius of the coupling element 9. The relationship between motor torque and speed is determined by using a Hall sensor to obtain the rotational speed ω of the transmission rod 11, which represents the rotational speed of the crane drive source. At this time, the torque of the crane drive source is... Where P mech P is the output power of the crane drive source. elec The electrical output power of the crane drive source is determined by installing either a current or voltage sensor at the crane drive source. η is the transmission efficiency, and its applicable value is determined within the network based on the type of coupling element 9. When either the current or voltage sensor fails... Where J is the moment of inertia of the crane drive source, and its applicable value can be determined within the Internet based on the type of crane drive source. Angular acceleration is acquired intermittently via an optical encoder (a type of speed sensor) using the detection groove 3. This is combined with the T values ​​obtained from the presence or absence of a current sensor and a voltage sensor. motor The calculation principle was used to obtain the crane load mass.

[0036] like Figures 1-4 As shown, this solution includes:

[0037] The connecting housing is integrally formed from high-strength cast steel and installed inside the crane near the crane's drive source, serving as the main body of the protective device.

[0038] The linkage component, after being processed by heat treatment and tempering, is fixed to the outside of the assembly and is used to obtain the rotational force of the drive source.

[0039] The heat dissipation component is installed between the assembly and the linkage using an aluminum alloy die-casting process. It includes a three-stage centrifugal flow guiding structure, which utilizes the centrifugal effect generated by rotational force to implement convective heat dissipation at the connection.

[0040] Sensor assembly 13 is integrated outside the connecting housing, away from the crane drive source, and is used to acquire real-time data of the rotation angle / speed of the linkage.

[0041] It should be noted that the linkage components in this application include:

[0042] The transmission rod 11 is made of 42CrMo alloy steel and nitrided. It is installed at the central axis of the connecting housing with H7 / g6 tolerance. One end is connected to a coupling component 9 that matches the type of crane drive source through a Morse taper hole with a taper of 1:10. The other end passes through the bottom of the connecting housing and is fixed with a turntable 4 made of QT600-3 material using a heat-fitting process. The surface of the turntable 4 is ground and has equally angularly distributed detection grooves 3 with a depth of 2mm±0.05, wherein the groove spacing error does not exceed 0.1°.

[0043] Furthermore, it should be noted that in this application, the sensor assembly 13, based on the frequency characteristic of the detection groove 3 appearing once every 15° rotation of the turntable 4, sends a 0-10V analog pulse signal to the crane control console via an RS485 bus. The control console obtains the precise rotation parameters of the drive source based on the time interval and amplitude characteristics of the pulse signal, and determines the real-time load of the crane in combination with the calculation principle.

[0044] In a preferred embodiment, the connecting housing includes:

[0045] The transparent mesh shell 2 is laser-cut from 304 stainless steel. An aluminum alloy shield 1 with a waterproof rubber ring is installed around the shell opening. The far end of the transparent mesh shell 2 is milled by a CNC machining center to form a sensor mounting platform, which forms a transition fit with the base of the sensor assembly 13. The detection end of the sensor assembly 13 maintains a constant monitoring distance of 5±0.5mm from the surface of the turntable 4 through an adjustable bracket. The outer end of the transparent mesh shell 2 near the sensor assembly 13 adopts a φ3mm circular hole array to achieve a 60% opening rate hollow design, while the far end retains a 30% opening rate semi-open structure. The internal guide ribs are set to form a directional heat dissipation channel. In addition, it should be noted that in this application, the transmission rod 11 is placed on the shoulder of the semi-open section of the transparent mesh shell 2 and is fixed with a 20CrMnTi transmission gear 10 through a keyway fit.

[0046] It should be further noted that, in this embodiment, the heat dissipation component includes:

[0047] The transfer cylinder 7 is an aluminum-silicon alloy cylinder formed by spinning. The opening of the transfer cylinder 7 is a connecting notch 16, which is used to fit into the mesh opening of the mesh shell 2. In actual use, six ABS material guide nozzles 8 can be arranged in a 60° array on the outer side of the transfer cylinder 7 facing the coupling member 9. It should be noted that this setting allows the nozzle flow channel to form a fluid dynamic characteristic with the inner cavity of the transfer cylinder 7 through CFD optimization design, which effectively improves the heat dissipation efficiency. In addition, the outlet direction of the guide nozzles 8 is all facing the coupling member 9, ensuring that the cooling airflow can evenly cover the surface of the coupling member 9, further enhancing the heat dissipation effect.

[0048] It should also be noted that, in actual use, the internal structure of the transfer cylinder 7 is rotatably connected to a servo gear 12, which forms a 1:1.5 reduction ratio with the transmission gear 10, via an angular contact ball bearing. At the center of this gear is integrated a turbine blade 14 made of 17-4PH stainless steel, with a blade installation angle of 35° and an aspect ratio of 2.5. When the transmission gear 10 operates at its rated speed, the servo gear 12 generates a rotational speed of 1200 r / min through the gear pair, thereby generating an 8 m / s rotational speed. 3 A forced airflow of / min guides the cooling medium outside the mesh shell 2 along a spiral trajectory to the inner cavity of the transfer cylinder 7. The medium is then directed to form a 15m / s directional jet through the guide nozzle 8 for precise heat dissipation. It should be noted that a sleeve rod 15 passes through the inside of the servo gear 12, and the sleeve rod 15 is installed at the central axis of the bottom end inside the transfer cylinder 7.

[0049] In a preferred embodiment, an assembly arm 6 is welded to the outside of the connecting housing. The assembly arm 6 is an I-beam structure with a high-strength nylon tensioning strap 5 inserted inside. In actual use, the surface of the strap of the assembly arm 6 is provided with anti-slip texture and equipped with a ratchet tensioner, which can realize the rapid installation and positioning of the peripheral equipment of the crane drive source.

[0050] In a preferred embodiment, the sensor assembly 13 includes a 23-bit absolute photoelectric encoder and a dual-channel Hall sensor. The photoelectric encoder is directed at the movement trajectory of the detection groove 3 at a 30° incident angle via a 650nm laser emitter. The InSb magnetic probe of the Hall sensor extends parallel to the axial surface of the transmission rod 11 with a gap of 0.1mm. The data from the two sensors are fused using a Kalman filter algorithm to output a comprehensive detection signal.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A device for crane load verification, characterized in that, The utility model relates to a crane load sensor, which comprises: a connecting shell installed near a driving source of a crane; a linkage fixed outside the connecting shell to obtain rotating power of the driving source; a heat dissipation component installed between the connecting shell and the linkage to dissipate heat at the connecting position by using the rotating power; a sensor assembly (13) integrated outside the connecting shell away from the driving source of the crane to calculate the load of the crane by obtaining rotating angle / speed data of the linkage; the linkage comprises: a transmission rod (11) inserted at a central axis of the connecting shell, one end of which is provided with a coupling (9) matched with the driving source of the crane by plug-in installation, and the other end of which penetrates through the bottom of the connecting shell and is fixed with a rotating disc (4), the surface of the rotating disc (4) being provided with a detection groove (3) for recording of the sensor assembly (13); the sensor assembly (13) sends a pulse signal to a control console of the crane according to the frequency of the detection groove (3) appearing on the rotating disc (4), and the control console obtains rotating angle / speed data of the driving source according to the pulse signal and calculates the load of the crane.

2. A device for load verification of a crane according to claim 1, characterized in that: the connecting shell comprises: a meshing shell (2), the periphery of the shell opening being provided with a shielding cover (1) for protecting the coupling, one end edge of the meshing shell (2) away from the shell opening being combined with the sensor assembly (13), and the detection end of the sensor assembly (13) facing the surface of the rotating disc (4).

3. A device for load testing of a crane according to claim 2, characterized in that: one end of the periphery of the meshing shell (2) near the sensor assembly (13) is designed to be hollow, and the other end of the periphery of the meshing shell (2) is designed to be semi-opened; the transmission rod (11) is fixed with a transmission gear (10) at the position outside the semi-opened periphery of the meshing shell (2), and the transmission gear (10) is used for providing rotating power for the heat dissipation component.

4. A device for load verification of a crane according to claim 3, characterized in that: the heat dissipation component comprises: a transfer cylinder (7), the cylinder opening facing the periphery of the meshing shell (2), the transfer cylinder (7) being fixed with a flow guide nozzle (8) at the position outside the coupling, the inside of the transfer cylinder (7) being rotationally connected with a servo gear (12) matched with the transmission gear (10), and the center of the servo gear (12) being integrated with turbine blades (14); with the operation of the transmission gear (10), the servo gear (12) rotates and guides the gas outside the meshing shell (2) to the inside of the transfer cylinder (7) according to the turbine blades (14) and is discharged along the flow guide nozzle (8).

5. A device for load verification of a crane according to claim 1, characterized in that: the connecting shell is fixed with an assembly arm (6) outside, the assembly arm (6) being inserted with a collection belt (5) used for being bound near the driving source of the crane inside.

6. A device for load verification of a crane according to claim 1, characterized in that: the sensor assembly (13) comprises a photoelectric encoder and a Hall sensor, the laser emission end of the photoelectric encoder being opposite to the moving track of the detection groove (3), and the magnetic sensing probe of the Hall sensor extending to the axial surface of the transmission rod (11).

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