Hanging shaft type portal crane grounding device

Abstract

The utility model relates to a hanging shaft type portal crane grounding device which comprises a grounding box used for being fixed with a portal crane moving frame, a guide sleeve is arranged in the grounding box, a hanging shaft is connected in the guide sleeve in a sliding mode, and the lower end of the hanging shaft penetrates through a bottom plate of the grounding box and then is connected with a grounding copper plate. A pressure spring is arranged between the grounding copper plate and the bottom plate, the bottom of the grounding copper plate is a sliding contact bottom surface, the periphery of the sliding contact bottom surface is a sliding contact inclined surface which is inclined towards the outer upper direction, and a cable plug connector is arranged on the grounding box, so that a grounding cable is connected with the hanging shaft through the cable plug connector. The hanging shaft type portal crane grounding device has good current conductivity, the bearing damage risk existing in a wheel direct grounding mode is avoided, the situation that a tension spring type contact shoe is clamped cannot occur, and the hanging shaft type portal crane grounding device is safe and reliable.

Description

Technical Field

[0001] The utility model relates to the field of water conservancy and hydropower engineering, in particular to a hanging shaft type gantry crane grounding device. Background Art

[0002] In water conservancy and hydropower projects, especially various hydraulic gate projects and pump station projects, gantry cranes are widely used to open and close gates and perform equipment maintenance. All gantry cranes used outdoors must be well grounded between the mobile frame and the track. In case of thunderstorms, the current generated by lightning strikes is introduced into the earth, and the fault current generated by equipment leakage is connected to the earth. If the gantry crane grounding device is not properly set, the lightning current and fault current will enter the earth through the bearings of each walking mechanism, causing bearing damage and electrical corrosion of the bearings, thus affecting the safe operation of the gantry crane; if the current cannot be connected to the earth, it may even pose a threat to the lives of the staff on the gantry crane. These are all tests for our operation management personnel.

[0003] At present, the lightning protection and fault grounding methods of gantry cranes are mainly through direct wheel grounding or installation of tension spring contact shoes for grounding. When the wheels are directly grounded, the lightning current or fault current will directly connect to the earth through the wheel bearings, which may cause bearing damage and affect the safe operation of the gantry crane equipment; when the tension spring contact shoes are installed for grounding, the tension of the tension spring makes the two contact shoes stick to the upper surface of the track in the process of tightening each other, but when the track surface encounters obstacles, abnormal protrusions or track joints, the tension spring will cause the contact shoes to rotate or even get stuck to each other, thereby losing the grounding effect and affecting the operation of the gantry crane. These grounding methods all have certain safety hazards, threatening equipment and personal safety. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a suspended-axle door machine grounding device, which has good current conductivity, not only avoids the risk of bearing damage in the direct grounding of the wheel, but also does not cause the situation of spring-type contact shoes getting stuck, and is safe and reliable.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A hanging shaft type door machine grounding device comprises a grounding box for fixing to a door machine moving frame, a guide sleeve is arranged in the grounding box, a hanging shaft is slidably connected in the guide sleeve, the lower end of the hanging shaft passes through the bottom plate of the grounding box and is connected to a grounding copper plate, a pressure spring is arranged between the grounding copper plate and the bottom plate, the bottom of the grounding copper plate is a sliding contact bottom surface, the outer periphery of the sliding contact bottom surface is arranged as a sliding contact inclined surface inclined outward and upward, and a cable connector is arranged on the grounding box to connect the grounding cable to the hanging shaft through it.

[0007] Furthermore, the upper end of the suspension shaft passes through the top of the grounding box to form a suspension portion.

[0008] Furthermore, a limiting ring is connected to the suspension shaft between the base plate and the guide sleeve.

[0009] Furthermore, the limiting ring is a stroke adjusting nut arranged on the hanging shaft.

[0010] Furthermore, the suspension shaft includes a suspension rod and a grounding rod connected up and down, the lower end of the grounding rod is fixedly connected to the grounding copper plate, the upper end of the grounding rod passes through the guide sleeve and is connected to the lower end of the suspension rod, and one end of the grounding cable is connected to the upper end of the grounding rod.

[0011] Furthermore, one side of the grounding box is removably sealed by a U-shaped side plate and bolts.

[0012] The utility model adopts the above technical solution, and has the advantages of:

[0013] 1. The grounding device of the hanging shaft door machine adopts the grounding copper plate as the direct contact part with the track, which greatly improves the conductivity of the current; the periphery of the grounding copper plate is designed as an inclined surface, which can smoothly pass through when encountering uneven track surface or track joints; a pressure spring is used to control the contact surface of the grounding copper plate and the track to always be in surface contact, ensuring a good current path.

[0014] 2. The grounding resistance of the door machine is less than 4Ω, which is within the specification requirements. After on-site trial operation, the grounding device has an ideal effect and meets the existing use conditions. It effectively solves the damage to equipment or personnel caused by poor grounding during the use of the door machine; solves the problem of bearing damage caused by directly using the door machine wheel for grounding; solves the problem of abnormal conditions such as jamming and flipping of the spring-type contact shoe door machine grounding device during use.

[0015] 3. The hanging part is set up, and the grounding copper plate can be manually lifted and lowered according to work needs to cope with complex usage environments; the stroke adjustment nut can adjust the working stroke of the hanging shaft according to the actual work site requirements, making it more practical and universal.

[0016] 4. The hanging shaft type door machine grounding device has a simple structure, is easy to manufacture, easy to install, and has low cost. It has an ideal use effect, realizes the reliable grounding of the metal structure of the door machine, and ensures the safety of equipment and personnel. It can be used for reference in other projects and equipment with sliding grounding, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the utility model;

[0018] Figure 2 for Figure 1 Left view of

[0019] Figure 3 for Figure 2 AA section structural diagram;

[0020] Figure 4 for Figure 1 A magnified image from an upward angle.

[0021] In the figure, 1. grounding box, 2. guide sleeve, 3. hanging shaft, 4. bottom plate, 5. grounding copper plate, 6. pressure spring, 7. cable connector, 8. grounding cable, 9. hanging part, 10. limiting ring, 11. U-shaped side plate, 12. bolt. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0024] like Figure 1-4 As shown, in this embodiment, the hanging shaft type door machine grounding device includes a grounding box 1 for fixing to the door machine moving frame, a guide sleeve 2 is provided in the grounding box 1, a hanging shaft 3 is slidably connected in the guide sleeve 2, the lower end of the hanging shaft 3 passes through the bottom plate 4 of the grounding box 1 and is connected to a grounding copper plate 5, a pressure spring 6 is provided between the grounding copper plate 5 and the bottom plate 4, the bottom of the grounding copper plate 5 is a sliding bottom surface, the outer periphery of the sliding bottom surface is set as a sliding inclined surface inclined outward and upward, the grounding box 1 is provided with a cable connector 7, through which the grounding cable 8 is connected to the hanging shaft 3, the hanging shaft is provided with a grounding cable connecting bolt, and the other end of the grounding cable will be connected to the door machine grounding system to form a reliable current path.

[0025] Working principle: The grounding copper plate 5 can always be in contact with the track under the action of the pressure spring 6, forming an effective contact surface, ensuring a good current path, and thus ensuring that the lightning current and fault current are promptly introduced into the earth; the suspension shaft 3 connected to the grounding copper plate 5 cooperates with the guide sleeve 2 to provide a guide for the up and down movement of the grounding copper plate 5. Specifically, during use, the sliding bottom surface of the grounding copper plate 5 contacts the track surface and slides with the gantry crane moving frame. The periphery of the sliding bottom surface is a sliding inclined surface with a certain inclination angle, so that the grounding copper plate 5 can pass smoothly when encountering an uneven track surface or a track joint.

[0026] In one specific embodiment, the upper end of the suspension shaft 3 passes through the top of the grounding box to form a suspension portion 9. With this arrangement, the grounding copper plate can be manually lifted and lowered when the device is under maintenance or in a non-working state, so as to cope with complex use environments.

[0027] In one specific embodiment, a limit ring 10 is connected to the suspension shaft 3 between the base plate 4 and the guide sleeve 2 to limit the up and down movement of the suspension shaft. When the limit ring 10 is threadedly connected to the travel adjustment nut on the suspension shaft, the movement stroke can be adjusted. When used specifically, the extension amount of the grounding rod can be reasonably adjusted according to the workplace.

[0028] In one specific embodiment, the suspension shaft includes a suspension rod and a grounding rod connected upper and lower, the lower end of the grounding rod is fixedly connected to the grounding copper plate, the upper end of the grounding rod passes through the guide sleeve and is connected to the lower end of the suspension rod, and one end of the grounding cable is connected to the upper end of the grounding rod.

[0029] In one specific embodiment, one side of the grounding box is removably sealed by a U-shaped side plate 11 and bolts 12 .

[0030] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0031] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A grounding device for a hanging shaft door machine, characterized in that: It comprises a grounding box for fixing to the mobile frame of the gantry crane, a guide sleeve is arranged in the grounding box, a hanging shaft is slidably connected in the guide sleeve, the lower end of the hanging shaft passes through the bottom plate of the grounding box and is connected to a grounding copper plate, a pressure spring is arranged between the grounding copper plate and the bottom plate, the bottom of the grounding copper plate is a sliding contact bottom surface, the outer periphery of the sliding contact bottom surface is arranged as a sliding contact inclined surface inclined outward and upward, and a cable connector is arranged on the grounding box to connect the grounding cable to the hanging shaft through it.

2. The grounding device of the suspended shaft type door machine according to claim 1, characterized in that: The upper end of the hanging shaft passes through the top of the grounding box to form a hanging portion.

3. The grounding device of the suspended shaft type door machine according to claim 1, characterized in that: A limiting ring is connected to the suspension shaft between the bottom plate and the guide sleeve.

4. The grounding device for a suspended shaft type door machine according to claim 3, characterized in that: The limiting ring is a travel adjustment nut arranged on the hanging shaft.

5. The grounding device for a suspended shaft type door machine according to claim 1, characterized in that: The suspension shaft includes a suspension rod and a grounding rod connected up and down. The lower end of the grounding rod is fixedly connected to the grounding copper plate. The upper end of the grounding rod passes through the guide sleeve and is connected to the lower end of the suspension rod. One end of the grounding cable is connected to the upper end of the grounding rod.

6. The grounding device for a suspended shaft type door machine according to claim 1, characterized in that: One side of the grounding box is removably sealed by a U-shaped side plate and bolts.

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