Polisher suitable for polishing sealing surface on periphery of hole

Abstract

The invention relates to a polisher suitable for polishing a sealing surface on the periphery of a hole, and belongs to the field of grinding tools, grinding materials and electric tools. The polisher comprises a connecting rod used for being connected with a polishing shaft of the polisher and a pressing plate used for being coaxially connected with the connecting rod and provided with a polishing face, the side, located on the polishing face of the pressing plate, of the connecting rod is further coaxially provided with a positioning device, and the peripheral size of the positioning device is matched with the size of the open hole so that the polisher can be limited through the open hole through the positioning device. The polisher can position a hole, the surface of the hole after polishing is uniform and flat, and slight deformation of the surface of the hole is avoided.

Description

Technical Field

[0001] The present invention relates to a grinding tool suitable for grinding the sealing surface around a hole, belonging to the fields of abrasives, grinding materials, and power tools. Background Art

[0002] A grinding tool is a mechanical device mainly used for grinding and polishing the surfaces of various workpieces. Its main function is to level and finely process the surface of the workpiece, remove burrs, scale, rust and other defective substances on the surface, make the surface more flat and smooth, and improve the quality and service life of the workpiece.

[0003] Currently, for the polishing of the opening, usually a manual polishing tool is held by hand to grind the surface of the opening. For example, for the opening of the gas box of an air-filled cabinet, the manual grinding method is not only inconvenient to operate, but also has a relatively high labor intensity, a long operation time, and the manual grinding force is uneven, resulting in slight deformation of the surface of the opening part, thus affecting the sealing grade of the air-filled cabinet gas box. Currently, most grinding tools are a connecting rod of a grinding machine connected to a pressing plate, and sandpaper is installed on the grinding surface of the pressing plate. Employees manually grind the opening surface according to experience. During the grinding process, the holding force is different, resulting in uneven grinding of the grinding tool and an uneven surface after grinding. Summary of the Invention

[0004] The purpose of the present invention is to provide a grinding tool suitable for grinding the sealing surface around a hole, so as to solve the problem that the surface of the opening ground by the existing grinding tool is uneven and not flat.

[0005] To achieve the above purpose, the solution of the present invention includes:

[0006] A grinding tool suitable for grinding the sealing surface around a hole of the present invention includes a connecting rod for connecting the grinding shaft of a grinding machine, and a pressing plate with a grinding surface coaxially connected to the connecting rod. A positioning device is coaxially arranged on one side of the pressing plate with the grinding surface, and the outer peripheral dimension of the positioning device matches the opening dimension, so as to realize the limiting of the grinding tool by the opening through the positioning device.

[0007] Beneficial Effects: A grinding tool of the present invention includes a connecting rod, a pressing plate with a grinding surface, and a positioning device. Through the setting of the connecting rod, the grinding tool can be connected to the grinding machine and can connect the pressing plate and the positioning device. When polishing and grinding the opening on the surface of the air-filled cabinet box body, through the cooperation between the positioning device and the opening of the annular sealing surface, positioning grinding is realized. The efficiency of grinding the opening by this grinding tool is improved, the surface of the opening after grinding is more uniform, flat and smooth, avoiding slight deformation of the surface of the opening part caused by uneven force during the manual grinding process, and the structure and combination method of the grinding tool of the present invention are simple and convenient to install.

[0008] Further, the positioning device includes a locking sleeve, a bearing, and a positioning sleeve that are sequentially sleeved; the locking sleeve is fixed on the connecting rod, and the size of the positioning sleeve matches the size of the opening.

[0009] Beneficial effects: The positioning device adopts a structure combining a bearing and a positioning sleeve, which can not only play a positioning role but also prevent the positioning sleeve from rotating with the connecting rod, thereby causing serious friction between the positioning sleeve and the inner wall of the opening and enlarging the opening area.

[0010] Further, the connecting rod includes a connection end for connecting with the shaft end of the grinding machine and an installation section for sequentially sleeving the pressing plate and the positioning device; the connection end forms a step for blocking the pressing plate, and the installation section presses the locking sleeve and the pressing plate of the positioning device on the step through bolts.

[0011] Beneficial effects: The connecting rod limits the pressing plate through the step for blocking the pressing plate, and then presses the locking sleeve and the pressing plate of the positioning device at the step through bolts, avoiding loosening or falling off of the pressing plate and the positioning device during the grinding process of the grinder.

[0012] Further, the connection end is threadedly connected to the grinding shaft, and the thread direction is opposite to the rotation direction of the grinding shaft.

[0013] Beneficial effects: The connection end of the connecting rod is threadedly connected to the grinding shaft, and the thread direction is opposite to the rotation direction of the grinding shaft. During the grinding process, after the grinding shaft rotates, it provides a force to tighten with the connection end of the connecting rod, avoiding loosening of the grinder during the grinding process.

[0014] Further, a circular positioning step is formed on the side of the locking sleeve facing the pressing plate, and the end face of the inner ring of the bearing facing the pressing plate contacts the positioning step, so that the outer ring of the bearing and the positioning sleeve on the outer ring of the bearing do not contact the grinding surface of the pressing plate.

[0015] Beneficial effects: A circular positioning step is formed on the side of the locking sleeve facing the pressing plate, isolating the positioning device and the pressing plate, and avoiding wear of the positioning sleeve when the pressing plate rotates. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the grinder in the grinder embodiment of the present invention;

[0017] Figure 2 is a main sectional view of the structure of the grinder in the grinder embodiment of the present invention;

[0018] Figure 3 is a top view of the structure of the grinder in the grinder embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of the grinder in the grinder embodiment of the present invention installed on a grinding machine;

[0020] In the figure, 1 is a connecting rod, 2 is a pressing plate, 3 is a positioning device, 4 is sandpaper, 1.1 is the connecting end of the connecting rod, 1.2 is the mounting section of the connecting rod, 3.1 is a positioning sleeve, 3.2 is a bearing, 3.3 is a locking sleeve, 3.4 is an end cover, and 3.31 is an annular positioning step. Specific embodiments

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] The concept of the present invention is to provide a grinding device applicable to grinding the sealing surface around a hole. The grinding device provided by the present invention is used for grinding the sealing surface around the hole. By using a grinding machine to provide rotational kinetic energy and making further improvements to the grinding device in view of the clamping method of the grinding machine, the grinding device includes a connecting rod connected to the grinding shaft of the grinding machine. The connecting rod is sequentially connected with a pressing plate and a positioning device. The surface of the pressing plate has a grinding surface. The positioning device is installed on the side of the pressing plate with the grinding surface, and the size of the outer shaft of the positioning device matches the size of the inner opening in the annular sealing surface, that is, the positioning device can just fit into the opening to achieve limiting and play a positioning role, while the outer shaft size of the pressing plate is larger than the outer shaft size of the positioning device.

[0023] An embodiment of the grinding device applicable to grinding the sealing surface around a hole provided by the present invention:

[0024] The purpose of this embodiment is to provide a grinding device as Figure 1 、 Figure 4 shown, including a connecting rod 1 for connecting the grinding shaft of the grinding machine. The connecting rod 1 is sequentially and coaxially connected with a pressing plate 2 and a positioning device 3, and the positioning device 3 is arranged on the side of the pressing plate with the grinding surface. Through the positioning device, the problems of uneven and unsmooth grinding plane are solved.

[0025] Such as Figure 2The front sectional view of the grinder shown includes a connecting rod 1 connected to a pneumatic grinding wheel grinder. This connecting rod 1 is connected to the grinding shaft of the grinder (i.e., an angle grinder) and rotates with the grinding shaft when the grinder is started. A pressure plate is sleeved on the connecting rod, and the size of the outermost shaft of the pressure plate corresponds to the opening, that is, the diameter is slightly larger than the diameter of the opening. The lower surface of the pressure plate has a grinding surface. In this embodiment, the grinding surface is formed by installing sandpaper 4 on the pressure plate. The positioning device 3 includes a set screw sleeve 3.3, a bearing 3.2, and a positioning sleeve 3.1 sleeved in sequence. As other embodiments, the positioning device can also be an annular iron plate detachably connected to the connecting rod, where the outer ring of the iron plate is sleeved with a lubricated sleeve, and the size of the outer ring of the iron plate sleeved with the sleeve is approximately equal to the size of the opening of the annular sealing surface. Among them, the iron plate in this embodiment has a set thickness and can play a role in positioning the opening. The device sleeved on the iron plate can not only be a lubricated sleeve. The positioning device can be selected according to actual needs. To avoid wearing the opening, in this embodiment, the positioning device of the set screw sleeve, bearing, and positioning sleeve sleeved is preferred.

[0026] The connecting rod 1 includes a connecting rod connection end 1.1 for connecting to the end of the grinding shaft of the grinder and a connecting rod installation section 1.2 for sequentially sleeving the pressure plate and the positioning device. The connecting rod connection end 1.1 forms a step for blocking the pressure plate. To prevent the pressure plate and the positioning device from falling off during the grinding process, the connecting rod installation section 1.2 presses the set screw sleeve 3.3 and the pressure plate 2 of the positioning device on this step through bolts. Among them, the pressure plate 2 of the installation section is detachably connected to the connecting rod 1, and the size of the pressure plate 2 is selected according to the opening size, that is, the pressure plate 2 with a size larger than the set size of the opening should be selected. For example, for an opening with a size of Ф110, a pressure plate with a model of Φ125 needs to be used. To make the pressure plate and the set screw sleeve more firmly sleeved at the installation section of the connecting rod and not move relative to the connecting rod during the grinding process, at least one side of the installation section of the connecting rod is milled flat axially to facilitate the positioning of the tightening tool when installing the connecting rod, such as Figure 3 As shown, the installation holes of the pressure plate and the set screw sleeve match the shape of the installation section so that the connecting rod can drive the pressure plate and the set screw sleeve to rotate. In this embodiment, both sides of the installation section of the connecting rod are milled flat axially.

[0027] The connecting rod connecting end 1.1 is threadedly connected to the grinding shaft. If the thread direction is the same as the rotation direction of the grinding shaft, during the grinding process, the grinder will loosen and fall off. Therefore, the connecting rod connecting end 1.1 is threadedly connected to the grinding shaft, and the thread direction is opposite to the rotation direction of the grinding shaft. During the grinding process, after the grinding shaft rotates, it provides a force to tighten the connecting end of the connecting rod, avoiding the loosening of the grinder during the grinding process. In this embodiment, the connecting rod connecting end 1.1 is threadedly connected to the grinding shaft through an internal thread. The positioning device 3 is sleeved on one side of the pressing plate 2 with a grinding surface. Among them, the bearing 3.2 is a rolling bearing. The inner ring of the bearing 3.2 is connected to the set screw sleeve 3.3, and the outer shaft is connected to the positioning sleeve. When an opening needs to be ground, the positioning device is sleeved into the opening to play a positioning role. Among them, the positioning device just fits at the opening. At this time, the inner ring of the rolling bearing 3.2 rotates with the connecting rod, while the outer ring sleeved with the positioning sleeve 3.1 remains stationary, thus playing a positioning role. The positioning sleeve 3.1 is combined with the rolling bearing 3.2 to prevent the positioning sleeve 3.1 from rotating with the grinding wheel, resulting in friction between the positioning sleeve and the inner wall of the hole. Therefore, the size of the outer ring matches the size of the opening of the annular sealing surface and is smaller than the size of the pressing plate 2, so that the sandpaper 7 can evenly grind the surface of the opening. For example, for an opening with a size of Ф110, a grinder with a round sealing surface with a pressing plate model of Φ125 and a positioning sleeve model of Φ110 is required. Among them, to avoid direct contact between the pressing plate and the positioning device and wear the positioning sleeve, a circular positioning step 3.31 is formed on the side of the set screw sleeve 3.3 facing the pressing plate. The end face of the inner ring of the bearing 3.2 facing the pressing plate contacts the positioning step 3.31, separating the outer ring of the bearing and the positioning sleeve on the outer ring from the grinding surface of the pressing plate. In addition, to prevent the product from being very thin and the grinder moving when entering the opening and failing to play a positioning role, the thickness of the circular positioning step 3.31 is less than the thickness of the product to be ground.

[0028] Apply the grinder in this embodiment to the opening of the gas box of the gas-insulated switchgear. The processing process is as follows: First, select a pressing plate 2 and a positioning sleeve 3.1 that match the size of the opening of the gas box; secondly, fix the gas box to ensure that the surface to be ground is horizontal with respect to the ground. Next, align the positioning sleeve 3.1 with the opening, and the positioning sleeve 3.1 of the grinder extends into the opening until the sandpaper 4 contacts the surface of the punched hole; finally, start the pneumatic grinder. Under the cooperation of the positioning sleeve 3.1 and the rolling bearing 3.2, rotate the pressing plate 2 to drive the sandpaper 4 to grind the opening, and keep the grinding time within the set time (for example, 5 - 10s), then a smoother and more even sealing surface can be obtained. Furthermore, it largely solves the problem of uneven and unsmooth grinding planes.

Claims

1. A grinder applicable to the grinding seal surface around a hole, characterized in that, it includes a connecting rod for connecting the grinding shaft of the grinding machine, and a pressing plate with a grinding surface coaxially connected to the connecting rod. A positioning device is coaxially arranged on the side of the pressing plate with the grinding surface where the connecting rod is located. The outer peripheral dimension of the positioning device matches the opening dimension, so as to realize the limit of the grinder by the opening through the positioning device.

2. The grinder applicable to the grinding seal surface around a hole according to claim 1, characterized in that, the positioning device includes a set screw sleeve, a bearing and a positioning sleeve sleeved in sequence; the set screw sleeve is fixed on the connecting rod, and the dimension of the positioning sleeve matches the opening dimension.

3. The grinder applicable to the grinding seal surface around a hole according to claim 1, characterized in that, the connecting rod includes a connecting end for connecting with the shaft end of the grinding machine and an installation section for sequentially sleeving the pressing plate and the positioning device; the connecting end forms a step for blocking the pressing plate, and the installation section presses the set screw sleeve of the positioning device and the pressing plate on the step through bolts.

4. The grinder applicable to the grinding seal surface around a hole according to claim 3, characterized in that, the connecting end is threadedly connected to the grinding shaft, and the thread direction is opposite to the rotation direction of the grinding shaft.

5. The grinder applicable to the grinding seal surface around a hole according to claim 2, characterized in that, a ring-shaped positioning step is formed on the side of the set screw sleeve facing the pressing plate, and the end face of the inner ring of the bearing facing the pressing plate contacts the positioning step, so that the outer ring of the bearing and the positioning sleeve on the outer ring of the bearing do not contact the grinding surface of the pressing plate.

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