Local shaft testing device for real ship shaft grounding system

Abstract

The utility model relates to a local shaft testing device for a real ship shaft grounding system, which comprises a local shaft, a bottom plate, a gantry bracket, a real ship carbon brush group, a variable-speed motor, a direct-current power supply, a shaft current injection component and a mounting bracket, and is characterized in that the local shaft, the gantry bracket, the real ship carbon brush group, the variable-speed motor and the direct-current power supply form a passive compensation local shaft testing device; the simulation device is used for simulating the working state of a carbon brush assembly close to the actual ship use condition and achieving simulation of the shaft ground potential between a main shaft and a ship shell when only a passive shaft works in a grounding mode. The passive compensation carbon brush shaft ground potential testing device is composed of a local shaft, a gantry support, a real ship carbon brush assembly, a variable speed motor, a direct current power source, a main shaft current injection assembly, a mounting support and a millivoltmeter and is used for simulating the actual use structure state of the real ship carbon brush assembly, the testing device is used for adjusting the rotating speed of the testing device and the main shaft injection current and testing the shaft-to-ground voltage in real time in a passive compensation state.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of testing devices, in particular to a kind of local shaft testing device for the potential (shaft ground potential) measurement between main shaft and ship structure under the working state of real ship shaft grounding system. BACKGROUND

[0002] When the current technical index for real ship shaft grounding system is detected, often only pay attention to the suppression ratio of main shaft current or shaft ground potential fluctuation, due to lack of special local shaft testing device, passive compensation shaft ground potential can only be measured after carbon brush assembly real ship installation, therefore cannot accurately evaluate the comprehensive suppression effect of active and passive working of real ship shaft grounding system to main shaft current fluctuation, which is not conducive to the grasp of device overall performance and the improvement of control technology level. SUMMARY

[0003] The utility model provides a kind of local shaft testing device for real ship shaft grounding system, according to the size, material, rotating speed etc. of actual ship main shaft, bearing, corresponding ship body, the working condition of real ship carbon brush assembly is simulated to local shaft, can simulate the actual working state of carbon brush assembly under different rotating speed and main shaft anticorrosion current state more accurately, passive compensation shaft ground potential value under different states can be directly measured by milliohm meter.The device can effectively simulate the passive compensation shaft ground voltage of real ship shaft grounding system, and the device is reasonably designed, and the testing method is simple and reliable, and is very suitable for performance test of real ship shaft grounding system.

[0004] To achieve the above object, the utility model has the beneficial effects that a kind of local shaft testing device for real ship shaft grounding system, including local shaft, bottom plate, gantry support, real ship carbon brush group, variable speed motor, direct current power supply, shaft current injection assembly, mounting bracket, wherein:

[0005] Passive compensation local shaft testing device is composed of local shaft, gantry support, real ship carbon brush assembly, variable speed motor, direct current power supply, for simulating the working state of carbon brush assembly close to real ship use condition, realize the simulation of shaft ground potential between main shaft and ship shell when only passive shaft grounding works;

[0006] Passive compensation carbon brush shaft ground potential testing device is composed of local shaft, gantry support, real ship carbon brush assembly, variable speed motor, direct current power supply, main shaft current injection assembly, mounting bracket, millivolt meter, for simulating the actual use structure state of real ship carbon brush assembly, wherein, variable speed motor, direct current power supply, millivolt meter are used to adjust the rotating speed of testing device, main shaft injection current, and real-time test shaft ground voltage when passive compensation state.

[0007] Further, the local shaft is supported by the gantry support at both ends of the main shaft of the local shaft, the gantry support is fixedly connected to the bottom plate, the carbon brush holder and the carbon brush are connected to the bottom plate through an installation support, and the direct current is connected to the bottom plate through another installation support; the local shaft is provided with a real ship carbon brush assembly, the upper end of the real ship carbon brush assembly is connected to the carbon brush, and the lower end is connected to the bottom plate through a passive end; and the main shaft is connected to the variable speed motor through a belt wheel and a transmission belt.

[0008] Further, the passive compensation carbon brush shaft ground potential testing device is composed of a device mechanical structure and external auxiliary components, wherein the mechanical structure comprises a local shaft, a gantry support, a bottom plate, a real ship carbon brush assembly, a main shaft current injection assembly and an installation support, and is used for simulating the actual use structure state of the real ship carbon brush assembly; wherein the local shaft is supported by the gantry support at both ends of the main shaft, the gantry support is fixedly connected to the bottom plate, the carbon brush holder and the carbon brush are connected to the bottom plate through an installation support, the local shaft is provided with a real ship carbon brush assembly at one end, and the local shaft is provided with a main shaft current injection assembly at the other end; the upper end of the real ship carbon brush assembly is connected to the carbon brush, and the lower end is connected to the bottom plate through a passive end; the external auxiliary components comprise a variable speed motor, a direct current power supply and a millivolt meter, and are used for adjusting the rotating speed of the testing device, the main shaft injection current and the real-time testing of the shaft ground voltage in the passive compensation state; wherein the direct current is connected to the bottom plate through an installation support, the direct current is connected to the main shaft current injection assembly, and the passive end of the real ship carbon brush assembly is connected to the bottom plate through a millivolt meter; and the main shaft is connected to the variable speed motor through a belt wheel and a transmission belt.

[0009] Further, the shaft injection current carbon brush assembly adopts a copper slip ring and a graphite carbon brush, the carbon brush lead of the main shaft injection current carbon brush assembly is connected to an external adjustable direct current power supply, so that the adjustment of the injection current is facilitated.

[0010] Further, the local shaft is provided with a slip ring, a protective cover and a stuffing box between the two supporting bearings of the local shaft.

[0011] Further, the length of the local shaft is determined according to the size and number of the slip ring, and the length is ≤1m.

[0012] Further, the local shaft adopts a solid shaft, and the concentricity of the local shaft bearing installation is ensured.

[0013] Further, one end of the local shaft is connected to the driving belt wheel of the variable speed motor through an insulating belt, and the insulating belt is provided with a tensioning wheel fixing assembly, so as to realize the tensioning connection of the insulating belt.

[0014] Further, the variable speed motor is used for realizing the adjustment of different rotating speeds, simulating the low, medium and high speeds in the whole navigation process of the real ship, and realizing the real-time measurement of the rotating speed of the main shaft through the installation of a rotating speed sensor near the main shaft.

[0015] The beneficial effects of the utility model are:

[0016] The passive compensation local shaft testing device for the real ship shaft grounding system realizes the potential simulation between the main shaft and the ship shell in the real ship state, and through measuring the potential difference between the passive compensation carbon brush and the bottom plate, the effective measurement of the shaft grounding potential and the passive compensation technology state confirmation are quickly realized, and the method has the characteristics of good simulation real ship effect, fast response speed, convenient testing and the like.

[0017] The passive compensation local shaft testing device for the real ship shaft grounding system realizes the potential simulation between the main shaft and the ship shell in the real ship state, and through measuring the potential difference between the passive compensation carbon brush and the bottom plate, the effective measurement of the shaft grounding potential and the passive compensation technology state confirmation are quickly realized, and the method has the characteristics of good simulation real ship effect, fast response speed, convenient testing and the like. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the principle diagram of the local shaft testing device for the real ship shaft grounding system of the utility model;

[0019] Figure 2 is the structure diagram of the local shaft testing device under the passive compensation condition;

[0020] Figure 3 is Figure 2 the left view. DETAILED DESCRIPTION

[0021] The utility model will be further described in connection with the drawings and examples.

[0022] As Figures 1 to 3 shown, the utility model discloses a local shaft testing device for the real ship shaft grounding system, including bottom plate 1, gantry support 2, local shaft 3, installation support 4, real ship carbon brush group 6, shaft current injection assembly 7, variable speed motor 10, DC power supply 8 and the like.

[0023] The passive compensation local shaft testing device is composed of the local shaft 3, the gantry support 2, the real ship carbon brush assembly 6, the variable speed motor 10 and the DC power supply 8, is used to simulate the working state of the carbon brush assembly close to the real ship use condition, realizes the simulation of the shaft grounding potential between the main shaft and the ship shell when only passive shaft grounding works.

[0024] The passive compensation carbon brush shaft grounding potential testing device is composed of the local shaft 3, the gantry support 2, the real ship carbon brush assembly 6, the variable speed motor 10, the DC power supply 8, the main shaft current injection assembly 7, the installation support 4 and the millivoltmeter V, is used to simulate the actual use structure state of the real ship carbon brush assembly, wherein the variable speed motor, the DC power supply and the millivoltmeter are used to adjust the rotating speed of the testing device, the main shaft injection current and the real-time test of the shaft grounding voltage when in the passive compensation state.

[0025] The local shaft 3 in the passive compensation local shaft test device is supported by the gantry support 2 at both ends of the main shaft, the gantry support 2 is fixedly connected to the base plate 1, the carbon brush holder 5 and the carbon brush are connected to the base plate 1 through an installation support 4, and the direct current 8 is connected to the base plate 1 through another installation support 4, the local shaft 3 is provided with a real-ship carbon brush assembly 6, the upper end of the real-ship carbon brush assembly 6 is connected to the carbon brush, and the lower end is connected to the base plate 1 through a passive end A; the main shaft is connected to the variable-speed motor 10 through the pulley 11 and the transmission belt 9.

[0026] The passive compensation carbon brush shaft ground potential test device is composed of a device mechanical structure and external auxiliary components, wherein the mechanical structure includes a local shaft 3, a gantry support 4, a base plate 1, a real-ship carbon brush assembly 6, a main shaft current injection assembly 7, and an installation support 4, which is used to simulate the actual use structure state of the real-ship carbon brush assembly; wherein the local shaft 3 is supported by the gantry support 2 at both ends of the main shaft, the gantry support 2 is fixedly connected to the base plate 1, the carbon brush holder 5 and the carbon brush are connected to the base plate 1 through an installation support 4, the local shaft 3 is provided with a real-ship carbon brush assembly 6 at one end and a main shaft current injection assembly 7 at the other end, the upper end of the real-ship carbon brush assembly 6 is connected to the carbon brush, and the lower end is connected to the base plate 1 through a passive end A; the external auxiliary components include a variable-speed motor 10, a direct current source 8, and a millivolt meter V, which are used to adjust the speed of the test device, the main shaft injection current, and the real-time test of the shaft ground voltage in the passive compensation state; wherein the base plate is connected to the direct current through the installation support, the direct current is connected to the main shaft current injection assembly, and the passive end of the real-ship carbon brush assembly is connected to the base plate through the millivolt meter; the main shaft is connected to the variable-speed motor through the pulley and the transmission belt.

[0027] Preferably, a slip ring, a protective cover, and a stuffing box are installed between the two support bearings of the local shaft 3.

[0028] Preferably, the length of the local shaft 3 is determined according to the size and number of the slip rings, and the length is ≤1m.

[0029] Preferably, the local shaft 3 adopts a solid shaft, and the concentricity of the local shaft bearing installation is ensured.

[0030] Preferably, the shaft injection current carbon brush assembly 7 adopts a copper slip ring and a graphite carbon brush, the carbon brush lead of the main shaft injection current carbon brush assembly 7 is connected to an external adjustable direct current source, and the adjustment of the injection current can be conveniently realized.

[0031] Preferably, one end of the local shaft 3 is connected to the driving pulley of the variable-speed motor 10 through the transmission pulley 11 and the insulating belt, and the insulating belt is provided with a tensioning pulley fixing assembly 12 to realize the tensioning connection of the insulating belt.

[0032] Preferably, the variable speed motor 10 is used to realize the adjustment of different rotating speeds, realize the simulation of the total low, medium and high speed of the actual ship during navigation, and realize the real-time measurement of the rotating speed of the main shaft by installing a rotating speed sensor near the main shaft.

[0033] The utility model discloses a kind of passive compensation carbon brush shaft ground potential testing devices, including local shaft, carbon brush, carbon brush holder, carbon brush, protective cover, packing gland and the like, the local shaft is installed on the bottom plate, and the carbon brush is installed on the local shaft, and the carbon brush holder is installed on the carbon brush, and the protective cover is installed on the carbon brush holder, and the packing gland is installed on the carbon brush holder.

[0034] The method realizes the simulation of shaft ground potential between the main shaft and the ship shell only when passive shaft grounding works by local shaft testing device, and realizes the simulation of shaft ground potential under the conditions of different rotating speeds and different corrosion currents of the main shaft by actively injecting current into carbon brush and motor, which can effectively simulate passive compensation potential under the installation state of actual ship.

[0035] The specific design steps of the passive compensation carbon brush shaft ground potential testing device are as follows:

[0036] Step 1: according to the information of the size, material, bearing and ship body structure material below the main shaft of the specific ship, select a local shaft with the same material as the main shaft, as the metal material is a good equipotential body, the length of the local shaft is determined according to the size and number of slip rings, generally not more than 1m, in order to avoid eccentric vibration during the rotation of the local shaft, therefore, solid shaft installation is preferred, and the concentricity of the local shaft bearing installation is ensured. The two ends of the local shaft are supported by a gantry, the bottom plate is made of the same material as the ship body structure material, and the thickness meets the installation strength requirement;

[0037] Step 2: according to the installation requirements of the carbon brush assembly of the actual ship, install slip rings, gantry supports, carbon brush holders, carbon brushes, protective covers, packing glands and the like between the two supporting bearings of the local shaft, weld the gantry support and the bottom plate, and the number, material and installation sequence of the slip rings and carbon brushes are consistent with the carbon brush assembly used in the actual ship;

[0038] Step 3: in order to simulate the main shaft current, install a main shaft current injection carbon brush assembly at one end of the local shaft, which uses copper slip rings and graphite carbon brushes, and is equipped with corresponding support structure, the carbon brush lead of the main shaft current injection carbon brush assembly is connected with external adjustable DC power supply, which can conveniently realize the adjustment of injected current;

[0039] Step 4: One end of the local shaft is connected with the transmission rod of the variable-speed motor through the transmission groove by an insulating belt, avoiding the insulation connection between the motor and the local shaft test device table, avoiding the control of the resistance of the motor on the passive compensation shaft ground potential, and the motor and the local shaft device are fixed through the tensioning wheel fixing assembly, so that the transmission belt is tightly connected. The motor can realize the adjustment of different rotating speeds, realize the simulation of the total low, medium and high speed of the actual ship during navigation, and realize the real-time measurement of the rotating speed of the main shaft by installing a rotating speed sensor near the main shaft.

[0040] The technical key points of the utility model are:

[0041] (1) The potential simulation between the main shaft and the ship shell in the state close to the actual ship is realized, and the effective measurement of the shaft ground potential and the passive compensation technology state confirmation are quickly realized by measuring the potential difference between the passive compensation carbon brush and the bottom plate.

[0042] (2) It is used for the shaft ground voltage test and inspection when the passive carbon brush works, so that it meets the main shaft current fluctuation control and key part corrosion prevention requirements of the actual ship, and provides a basis for the technical state measurement of the actual ship shaft grounding device.

Claims

1. A local shaft testing device for a ship shaft grounding system, characterized by: The system includes a partial shaft, base plate, gantry bracket, actual ship carbon brush assembly, variable speed motor, DC power supply, shaft current injection component, and mounting bracket. Specifically: the partial shaft test device, composed of the partial shaft, gantry bracket, actual ship carbon brush assembly, variable speed motor, and DC power supply, is used to simulate the working state of the carbon brush assembly under conditions close to those of actual ship use, simulating the shaft-to-ground potential between the main shaft and the hull when only passive shaft grounding is required; and the carbon brush shaft-to-ground potential test device, composed of the partial shaft, gantry bracket, actual ship carbon brush assembly, variable speed motor, DC power supply, main shaft current injection component, mounting bracket, and millivoltmeter, is used to simulate the actual structural state of the actual ship carbon brush assembly. The variable speed motor, DC power supply, and millivoltmeter are used to adjust the rotational speed and main shaft injection current of the test device, and to perform real-time testing of the shaft-to-ground voltage under passive compensation conditions.

2. A local shaft testing arrangement for a ship shaft grounding system according to claim 1, characterized in that: In the passive compensation local shaft testing device, the main shaft of the local shaft is supported at both ends by gantry brackets, which are fixedly connected to the base plate. The base plate is connected to the carbon brush holder and carbon brush through a mounting bracket, and connected to DC current through another mounting bracket. The local shaft is equipped with a real ship carbon brush assembly. The upper end of the real ship carbon brush assembly is connected to the carbon brush, and the lower end is connected to the base plate through a passive end. The main shaft is connected to the variable speed motor through pulleys and transmission belts.

3. The local shaft testing apparatus for a full-scale shaft grounding system of claim 1, wherein: The passive compensation carbon brush shaft-to-ground potential testing device consists of a mechanical structure and external auxiliary components. The mechanical structure includes a partial shaft, a gantry bracket, a base plate, a real ship carbon brush assembly, a spindle current injection component, and a mounting bracket, used to simulate the actual structural state of the real ship carbon brush assembly. The partial shaft's spindle is supported at both ends by the gantry bracket, which is fixedly connected to the base plate. A mounting bracket connects the carbon brush holder and carbon brushes to the base plate. One end of the partial shaft houses the real ship carbon brush assembly, and the other end houses the spindle current injection component. The upper end of the real ship carbon brush assembly is connected to the carbon brushes, and the lower end is connected to the base plate via a passive terminal. The external auxiliary components include a variable speed motor, a DC power supply, and a millivoltmeter, used to adjust the test device's rotation speed and spindle injection current, and to test the shaft-to-ground voltage in passive compensation mode. The base plate is connected to the DC current injection component via the mounting bracket, and the millivoltmeter connects the passive terminal of the real ship carbon brush assembly to the base plate. The spindle is connected to the variable speed motor via pulleys and a drive belt.

4. A local shaft testing arrangement for a ship shaft grounding system according to claim 3, characterized in that: The spindle injection current carbon brush assembly uses copper slip rings and graphite carbon brushes. The carbon brush leads of the spindle injection current carbon brush assembly are connected to an external adjustable DC power supply to facilitate the adjustment of the injection current.

5. The local shaft testing apparatus for a full-scale shaft grounding system of claim 1, wherein: A slip ring, protective cover, and stuffing box are installed between the two support bearings of the partial shaft.

6. The local shaft testing apparatus for a full-scale shaft grounding system of claim 1, wherein: The length of the local shaft is determined based on the size and number of slip rings, and its length is ≤1m.

7. The local shaft testing apparatus for a full-scale shaft grounding system of claim 1, wherein: The partial shaft is made of solid shaft, and the concentricity of the partial shaft bearings is ensured.

8. The local shaft testing apparatus for a full-scale shaft grounding system of claim 1, wherein: One end of the local shaft is connected to the drive pulley of the variable speed motor via a transmission pulley and an insulating belt. The insulating belt is equipped with a tensioning wheel fixing assembly to achieve tensioning of the insulating belt.

9. The local shaft testing apparatus for a full-scale shaft grounding system of claim 1, wherein: Variable speed motor, used to realize the adjustment of different rotating speed, realize the simulation of low, medium and high speed in the process of ship navigation, and through the installation of rotating speed sensor near the main shaft, realize the real-time measurement of the rotating speed of the main shaft.

Images