Multi-point grinding device

Abstract

The invention provides a multi-point grinding device which is characterized in that a mounting cylinder used for mounting a driving shaft is fixed to the center of a shell of the multi-point grinding device, at least two grinding heads arranged side by side are connected to the lower portion of the shell, and the driving shaft transmits power to the grinding heads through a gear set in the shell, so that the grinding heads rotate synchronously; the number of the polishing heads can be any. The gear set comprises a main gear, an intermediate gear and a driven gear, the main gear is coaxially connected with the driving shaft, the driven gear is coaxially connected with the grinding head through a driven shaft, a driven shaft seat is arranged in the shell to install the driven shaft, and the upper end of the driven shaft is installed in the driven shaft seat through a spring to achieve vertical floating so as to adapt to linear changes of the surface of the bulkhead. When the multiple polishing heads make contact with the surface of the bulkhead, the polishing heads can be well attached to the surface of the bulkhead. According to the polishing device, multiple point positions can be polished at the same time, the polishing efficiency is effectively improved, and consumption of manpower and working hours is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly to a multi-point grinding device. Background Art

[0002] As a core component of the liquid cargo tank of a liquefied gas carrier, the design and construction of the containment system have extremely high technical difficulties and process requirements. This system is not only structurally complex, involving the precise cooperation of multiple layers of functional materials, but also needs to maintain long-term stable performance at extremely low working temperatures (usually below -163°C). Among them, the sealing performance, as one of the most critical technical indicators of the containment system, is directly related to the safe operation of the entire liquefied gas tank.

[0003] Taking the MARK III type thin-film containment system as an example, there are multiple process difficulties during its construction process, and the installation link of the thermal insulation layer is particularly prominent. In this system, the welding studs used to fix the thermal insulation boards need to be densely welded to the inner wall of the cargo tank through the upset welding process. Due to the process sequence requirements of shipbuilding, at this time, the surface of the tank wall has been coated with an anti-corrosion paint coating, and the presence of this coating will significantly affect the quality of upset welding: First, the insulating properties of the paint layer will cause an increase in the resistance of the welding circuit; second, the thermal decomposition of the coating may produce welding defects such as pores; more importantly, the residue of organic substances will reduce the mechanical properties of the weld metal. Therefore, the process specifications require that the welding area of each stud must be thoroughly ground to completely expose the base metal surface.

[0004] Therefore, it is necessary to grind the paint coating in the stud upset welding area to expose the metal surface of the tank wall. At present, the paint grinding is completed manually by holding a grinding gun single-point by single-point. Since the number of studs in the cargo tank is very large and the number of paint grinding points is also very large, this work will consume a large amount of man-hours. This inefficient operation mode has increasingly become a key factor restricting the shipbuilding progress. Summary of the Invention

[0005] To improve the grinding efficiency and reduce the input of manpower and man-hours, the present invention proposes a single-gun multi-point grinding device, especially an efficient grinding device with a single gun at four points and a single gun at two points, which is more suitable for the MARK-III thin-film containment system. However, the protection scope of the present invention is not limited to two points and four points, and can be changed to three points or more according to the grinding requirements.

[0006] To achieve the above object and other related objects, the present invention provides a multi-point grinding device. The multi-point grinding device includes a housing, the housing is in a box shape, a vertically upward mounting cylinder is fixed at the center of the housing, a driving shaft is installed in the mounting cylinder, at least two grinding heads arranged side by side are connected below the housing, the lower surface of the grinding head away from the housing is the grinding surface, and the driving shaft transmits power to the grinding heads through a transmission component inside the housing, so that each grinding head rotates synchronously;

[0007] The upper end of the mounting cylinder has an external thread for connecting the grinding gun. Inside the mounting cylinder, there are a main shaft hole and a main shaft seat for fixing the driving shaft, and an internal thread is also provided inside the mounting cylinder for installing the main shaft end cover.

[0008] Optionally, the number of the grinding heads is two or four, and the multiple grinding heads are symmetrically distributed.

[0009] Optionally, the transmission assembly is a gear set, including a main gear, an intermediate gear and a driven gear; the main gear is coaxially connected to the driving shaft, the driven gear is coaxially connected to the grinding head through a driven shaft, and both the main gear and the driven gear are meshed with the intermediate gear to achieve power transmission through the intermediate gear.

[0010] Optionally, the driving shaft includes a shaft diameter, a boss, a shaft end and a keyway; the shaft diameter is locked and fixed to the rotating shaft of the grinding gun, bearings are provided above and below the boss and are installed in the main shaft seat, and the shaft end and the keyway are used to connect the main gear of the gear set.

[0011] Optionally, a driven shaft seat is provided inside the housing for installing the driven shaft; the driven shaft is coaxially fixed to the driven gear, and housing covers are sleeved on both the upper and lower sides of the driven shaft.

[0012] Optionally, the housing cover includes a cylindrical side wall plate, one end of the cylindrical side wall plate is fixed with a cover plate, the cover plate is concave at the end relative to the cylindrical side wall plate to form an annular groove, the driven shaft passes through the center of the cover plate, the end of the cylindrical side wall plate away from the cover plate expands radially outward to form a convex ring, and the inner wall of the cylindrical side wall plate has a limiting strip parallel to the axis.

[0013] Optionally, the driven shaft seat is a cylindrical cylinder fixed inside the housing, and a vertical limiting groove is provided on the outer side wall of the cylindrical cylinder, and the limiting strip of the housing cover located above the driven shaft is inserted into the limiting groove.

[0014] Optionally, the upper end of the driven shaft is installed in the driven shaft seat through a spring to achieve up and down floating.

[0015] Optionally, the lower port of the housing is sealed by a gear end cover, and an annular protrusion is provided on the upper surface of the gear end cover, and the annular groove of the housing cover located below the driven shaft covers the annular protrusion.

[0016] Optionally, the lower end of the driven shaft passes downward through the gear end cover and is exposed outside the gear end cover, and the lower end of the driven shaft is connected to the grinding head through a connecting piece, and the connecting piece includes a keyway and a locking thread, the keyway is used to connect the driven shaft, and the locking thread is used to connect the grinding head.

[0017] As described above, the present invention provides a multi-point grinding device. At the center of the housing of the multi-point grinding device, a vertically upward mounting cylinder is fixed. The mounting cylinder is used to mount a driving shaft. At least two grinding heads arranged side by side are connected below the housing. The lower surface of the grinding head away from the housing is the grinding surface. The driving shaft transmits power to the grinding heads through a gear set inside the housing, so that each grinding head rotates synchronously. The number of grinding heads can be any number, so as to flexibly select the corresponding number of grinding heads according to the requirements of the actual grinding area. The gear set includes a main gear, an intermediate gear and a driven gear. The main gear is coaxially connected with the driving shaft. The driven gear is coaxially connected with the grinding head through a driven shaft. A driven shaft seat is provided inside the housing to mount the driven shaft. The upper end of the driven shaft is installed in the driven shaft seat through a spring to achieve up and down floating, so as to adapt to the linear change of the cabin wall surface. When multiple grinding heads contact the cabin wall surface, good fitting can be achieved. The grinding device of the present invention can grind multiple points simultaneously, effectively improving the grinding efficiency and reducing the consumption of manpower and working hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It shows a disassembled schematic diagram of the multi-point grinding device in Embodiment 1 of the present invention.

[0019] Figure 2 It shows a structural schematic diagram of the four-linkage and two-linkage device in Embodiment 1 of the present invention.

[0020] Figure 3 It shows a schematic diagram of the grinding points on the cabin wall in Embodiment 1 of the present invention.

[0021] Figure 4 It shows a disassembled three-dimensional structural schematic diagram of the multi-point grinding device in Embodiment 1 of the present invention.

[0022] Figure 5 It shows an installation schematic diagram of the driving shaft in Embodiment 1 of the present invention.

[0023] Figure 6 It shows a structural schematic diagram of the driving shaft in Embodiment 1 of the present invention.

[0024] Figure 7 It shows a structural schematic diagram of the gear set in Embodiment 1 of the present invention.

[0025] Figure 8 It shows an internal structural schematic diagram of the housing in Embodiment 1 of the present invention.

[0026] Figure 9 It shows a structural schematic diagram of the cover in Embodiment 1 of the present invention.

[0027] Figure 10 It shows a structural schematic diagram of the gear end cover in Embodiment 1 of the present invention.

[0028] Figure 11 It shows a schematic structural diagram of the connecting member in the first embodiment of the present invention.

[0029] Description of component numbers

[0030] Housing 20, driving shaft 11, grinding head 42, main shaft hole 110, main shaft seat 111, main shaft end cover 12, shaft diameter 101, boss 102, shaft end 103, keyway 104, bearing 112, gear set 21, main gear 121, intermediate gear 122, driven gear 321, driven shaft 31, driven shaft seat 311, cylindrical side wall plate 301, annular groove 302, limiting strip 303, limiting groove 312, gear end cover 23, annular protrusion 231, locking bolt 22, connecting member 41, locking thread 411. Specific embodiments

[0031] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0032] When detailing the embodiments of the present invention, for the sake of convenience of description, the cross-sectional views showing the device structure will be locally enlarged in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention here. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0033] For the sake of convenience of description, spatial relationship terms such as "below", "beneath", "lower than", "under", "above", "on" may be used herein to describe the relationship between one element or feature shown in the drawings and other elements or features. It will be understood that these spatial relationship terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can also be one or more intervening layers. As used herein, "between... and..." means including the endpoint values.

[0034] In the context of the present application, the structure in which the first feature is "above" the second feature described may include an embodiment in which the first and second features are formed in direct contact, and may also include an embodiment in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0035] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the illustrations, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0036] Embodiment 1

[0037] As Figures 1 to 11 shown, this embodiment provides a multi-point grinding device, which mainly includes:

[0038] A housing 20, the housing 20 is box-shaped, a vertically upward mounting cylinder is fixed at the center of the housing 20, a driving shaft 11 is installed in the mounting cylinder, at least two grinding heads 42 arranged side by side are connected below the housing, the lower surface of the grinding head 42 away from the housing 20 is a grinding surface, and the driving shaft 11 transmits power to the grinding heads 42 through a transmission component inside the housing, so that each grinding head 42 rotates synchronously. As an example, the number of the grinding heads 42 is an even number, such as two or four, and can also be an odd number, such as three or five. Of course, it can also be any other number. Select the corresponding number of grinding heads according to the requirements of the actual grinding area. As Figure 2 、 Figure 3 shown, there are four grinding points in the vertex areas of the four heat insulation plates, and a four-linkage device, that is, four grinding heads, is selected. There are two grinding points between the side lines of the two heat insulation plates, and a two-linkage grinding device is selected. As a preferred solution, multiple grinding heads are symmetrically distributed. The grinding head is a market standard component, and the grinding head rotates under the drive of power to complete the grinding work.

[0039] The upper end of the mounting cylinder has an external thread for connecting a grinding gun. A main shaft hole 110 and a main shaft seat 111 for fixing the driving shaft 11 are provided inside the mounting cylinder. An internal thread is also provided inside the mounting cylinder for installing a main shaft end cover 12.

[0040] Specifically, the driving shaft 11 includes a shaft diameter 101, a boss 102, a shaft end 103, and a keyway 104. The shaft diameter 101 is locked and fixed with the rotating shaft of the grinding gun. Bearings 112 are provided above and below the boss 102 and are installed in the main shaft seat 111. The shaft end 103 and the keyway 104 are used to connect the main gear 121 of the gear set 21.

[0041] Further, the transmission assembly is a gear set 21, including a main gear 121, an intermediate gear 122, and a driven gear 321. The main gear 121 is coaxially connected to the driving shaft 11. The driven gear 321 is coaxially connected to the grinding head 42 through a driven shaft 31. Both the main gear 121 and the driven gear 321 are meshed with the intermediate gear 122 to achieve power transmission through the intermediate gear 122. A driven shaft seat 311 is provided inside the housing 20 to mount the driven shaft 31. The driving shaft 11 is a power input shaft, one end of which is connected to the grinding gun and the other end is connected to the main gear 121 of the gear set. The driven shaft 31 is a power output shaft for connecting the grinding head 42, and it is installed inside the housing 20.

[0042] Further, the driven shaft 31 is coaxially fixed to the driven gear 321. Covers are sleeved on both the upper and lower sides of the driven shaft 31. The cover includes a cylindrical side wall plate 301. One end of the cylindrical side wall plate 301 is fixed with a cover plate. The cover plate is concave relative to the end of the cylindrical side wall plate 301 to form an annular groove 302. The driven shaft 31 passes through the center of the cover plate. The end of the cylindrical side wall plate 301 away from the cover plate expands radially outwards to form a convex ring. The inner wall of the cylindrical side wall plate 301 has a limiting strip 303 parallel to the axis.

[0043] Further, the driven shaft seat 311 is a cylindrical tube fixed inside the housing 20. A limiting groove 312 is provided on the outer side wall of the cylindrical tube along the vertical direction. The limiting strip 303 of the cover on the upper part of the driven shaft is inserted into the limiting groove 312.

[0044] Further, the lower port of the housing 20 is sealed by a gear end cover 23. The upper surface of the gear end cover 23 is provided with an annular protrusion 231. The annular groove 302 of the cover on the lower part of the driven shaft 31 covers the annular protrusion 231. The application of the cover, the main shaft end cover, and the gear end cover separates the internal space of the housing from the outside, avoiding the rotating components from causing harm to personnel during the use of the device, and at the same time preventing impurities in the external environment from entering the housing interior, improving the service life of the components during the long-term use of the device. The gear cover 23 is fixed to the housing 20 through locking bolts 22.

[0045] Further, the upper end of the driven shaft 31 is installed inside the driven shaft seat 311 through a spring to achieve up and down floating, so as to adapt to the linear change of the cabin wall surface. When multiple grinding heads are in contact with the cabin wall surface, good fitting can be achieved.

[0046] Further, the lower end of the driven shaft 31 passes downward through the gear end cover 23 and is exposed outside the gear end cover 23. The lower end of the driven shaft 31 is connected to the grinding head 42 through a connecting piece 41. The connecting piece 41 includes a keyway and a locking thread 411. The keyway is used to connect the driven shaft, and the locking thread 411 is used to connect the grinding head 42, finally transmitting the power to the grinding head at the end.

[0047] In summary, the present invention provides a multi-point grinding device. An upwardly vertical mounting cylinder is fixed at the center of the housing of the multi-point grinding device. The mounting cylinder is used for mounting a driving shaft. At least two grinding heads arranged side by side are connected below the housing. The lower surface of the grinding head away from the housing is a grinding surface. The driving shaft transmits power to the grinding heads through a gear set inside the housing, so that each grinding head rotates synchronously. The number of grinding heads can be any number, so as to flexibly select the corresponding number of grinding heads according to the requirements of the actual grinding area. The gear set includes a main gear, an intermediate gear and a driven gear. The main gear is coaxially connected with the driving shaft. The driven gear is coaxially connected with the grinding head through a driven shaft. A driven shaft seat is provided inside the housing to mount the driven shaft. The upper end of the driven shaft is installed in the driven shaft seat through a spring to achieve up and down floating, so as to adapt to the line shape change of the cabin wall surface. When multiple grinding heads contact the cabin wall surface, good fitting can be achieved. The grinding device of the present invention can grind multiple points simultaneously, effectively improving the grinding efficiency and reducing the consumption of manpower and working hours.

[0048] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A multi-point grinding device, characterized in that: The multi-point grinding device comprises a shell, which is box-shaped, a vertically upward mounting cylinder is fixed at the center of the shell, a driving shaft is installed in the mounting cylinder, at least two grinding heads arranged side by side are connected to the lower part of the shell, the lower surface of the grinding head away from the shell is a grinding surface, and the driving shaft transmits power to the grinding head through the transmission assembly inside the shell, so that each grinding head rotates synchronously; The upper end of the mounting tube has an external thread for connecting a grinding gun, the interior of the mounting tube is provided with a spindle hole and a spindle seat for fixing the driving shaft, and the interior of the mounting tube is also provided with an internal thread for installing the spindle end cover.

2. The multi-point grinding device according to claim 1, characterized in that: The number of the grinding heads is 2 or 4, and the multiple grinding heads are symmetrically distributed.

3. The multi-point grinding device according to claim 1, characterized in that: The transmission assembly is a gear set, including a main gear, an intermediate gear and a driven gear; the main gear is coaxially connected to the driving shaft, the driven gear is coaxially connected to the grinding head through the driven shaft, and the main gear and the driven gear are both meshed with the intermediate gear to achieve power transmission through the intermediate gear.

4. The multi-point grinding device according to claim 3, characterized in that: The driving shaft includes a shaft diameter, a boss, a shaft end and a keyway; the shaft diameter is locked and fixed with the grinding gun shaft, the boss is provided with bearings above and below and is installed in the main shaft seat, and the shaft end and the keyway are used to connect the main gear of the gear set.

5. The multi-point grinding device according to claim 3, characterized in that: A driven shaft seat is arranged inside the shell to install the driven shaft; the driven shaft is coaxially fixed with the driven gear, and both upper and lower sides of the driven shaft are covered with covers.

6. The multi-point grinding device according to claim 5, characterized in that: The cover shell includes a cylindrical side wall plate, a cover plate is fixed at one end of the cylindrical side wall plate, the cover plate is concave relative to the end of the cylindrical side wall plate and forms an annular groove, the driven shaft passes through the center of the cover plate, the end of the cylindrical side wall plate away from the cover plate is radially expanded outward to form a convex ring, and the inner wall of the cylindrical side wall plate has a limiting strip parallel to the axial direction.

7. The multi-point grinding device according to claim 6, characterized in that: The driven shaft seat is a cylindrical tube fixed inside the shell, and the outer wall of the cylindrical tube is provided with a limiting groove along the vertical direction, and the limiting strip of the cover shell located on the upper part of the driven shaft is inserted into the limiting groove.

8. The multi-point grinding device according to claim 7, characterized in that: The upper end of the driven shaft is installed in the driven shaft seat through a spring to achieve up and down floating.

9. The multi-point grinding device according to claim 6, characterized in that: The lower port of the housing is sealed by a gear end cover, an annular protrusion is provided on the upper surface of the gear end cover, and the annular groove of the cover shell located at the lower part of the driven shaft covers the annular protrusion.

10. The multi-point grinding device according to claim 9, characterized in that: The lower end of the driven shaft passes downward through the gear end cover and is exposed outside the gear end cover. The lower end of the driven shaft is connected to the grinding head through a connecting piece. The connecting piece includes a keyway and a locking thread. The keyway is used to connect the driven shaft, and the locking thread is used to connect the grinding head.

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