A polishing device with pre-adjusted pressure

Abstract

The invention discloses a polishing device with pre-adjusted pressure, comprising an upper lining shoe, a lower lining shoe, and a rotating shaft, wherein the upper lining shoe and the lower lining shoe are connected by the rotating shaft; further comprising an axial positioning block, a clamping block, a rounded corner clamping block, and an abrasive belt strip; the rounded corner clamping blocks are two long strip-shaped polyurethane blocks, which are respectively fixedly installed in the positioning grooves of the upper lining shoe and the lower lining shoe, and after the upper and lower lining shoes are closed into a full circle, the two rounded corner clamping blocks are symmetrically distributed at 180° on the circumference; the rounded corner clamping blocks are configured in a contoured manner; the two axial positioning blocks are respectively fixedly installed on one end surface of the upper and lower lining shoe positioning grooves by screws, and one end of the abrasive belt strip is passed between the axial positioning block and the rounded corner clamping block, and the other end of the abrasive belt strip is passed between the clamping block and the rounded corner clamping block; the invention has the advantages of realizing the overall polishing of the rounded corners of the crankshaft journal undercut groove, meeting the production needs of the polishing of the rounded corners of the crankshaft journal undercut groove, and having a good application prospect.

Description

Technical Field

[0001] The invention relates to the field of crankshaft processing, in particular to a polishing device for crankshafts. Background Art

[0002] The crankshaft is a key component in the engine. Most of the reasons for the fracture failure of the crankshaft are the rough processing of the surface of the journal fillet and the poor control of the fillet size. Therefore, when the crankshaft is working, a large stress concentration is generated at the journal fillet, which shortens the fatigue life of the crankshaft. The journal fillet of the marine crankshaft is often designed in the form of a groove fillet, which is used to reduce the stress concentration at the crankshaft journal fillet during the operation of the engine. This kind of crankshaft journal groove fillet needs to be polished after turning or milling. The existing method is to hang the crankshaft on the polishing machine, and after the two ends are positioned and clamped, the crankshaft rotates along the center of the main shaft; a handheld wind wrench drives the flap wheel to rotate and polish the fillets of each journal groove of the crankshaft; according to the different arc sizes on the groove fillet, it is necessary to select flap wheels of different diameters for polishing, the polishing amount of each part of the fillet is uneven, the fillet size is not well controlled, and the production efficiency is low. Therefore, there is an urgent need for a polishing method that can improve production efficiency and stabilize processing quality to meet production needs. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a crankshaft journal undercut groove fillet polishing device, the specific technical content is as follows:

[0004] A polishing device with pre-adjusted pressure, comprising an upper lining, a lower lining, and a rotary shaft, wherein the upper lining and the lower lining are connected by the rotary shaft, and the upper and lower linings are rotated around the rotary shaft to achieve closing and opening; further comprising an axial positioning block, a clamping block, a rounded corner pressing block, and an abrasive belt strip; the rounded corner pressing blocks are two long strip-shaped polyurethane blocks, which are respectively fixedly installed in the positioning grooves of the upper lining and the lower lining, and after the upper and lower linings are closed into a full circle, the two rounded corner pressing blocks are symmetrically distributed at 180° on the circumference; the rounded corner pressing blocks face the crankshaft journal and the rounded corner of the journal countersunk groove, and are arranged according to the arc shape of the crankshaft journal arc and the rounded corner of the journal countersunk groove; 2 The axial positioning blocks are fixedly installed on one end surface of the upper and lower lining tile positioning grooves by screws, respectively, to limit the axial movement of the fillet pressing block, and at the same time, one end of the abrasive belt is passed through between the axial positioning block and the fillet pressing block, and the screw is tightened to clamp the abrasive belt to fix it; the two clamping blocks are respectively connected by screws and fixedly installed on the other end surfaces of the upper and lower lining tile positioning grooves, respectively, and the other end of the abrasive belt is passed through between the clamping block and the fillet pressing block, and the screw is tightened to clamp the abrasive belt to fix it; it also includes a handle and an elastic adjustment device, the two handles are respectively connected to the upper and lower lining tiles by threads, and the two ends of the elastic adjustment device are connected to the upper and lower handles;

[0005] The elastic adjustment device includes a trapezoidal rod, the upper end of the trapezoidal rod is fixed to the upper handle, the lower end of the trapezoidal rod is sleeved with a screw sleeve, the inner side of the screw sleeve is connected to the bolt, the lower side of the bolt is connected to the upper side of the tension spring, and the lower side of the tension spring is fixed to the lower handle.

[0006] Both ends of the upper lining tile are designed with flanges, and both ends of the lower lining tile are designed with corresponding grooves. After the upper and lower lining tiles are closed, the flanges and the grooves cooperate to play a limiting role.

[0007] The advantages of the present invention are: achieving overall polishing of the fillet of the crankshaft journal countersunk groove, uniform fillet polishing amount, stable quality, high production efficiency, meeting the production needs of the crankshaft journal countersunk groove fillet polishing, and having good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1-1 It is a structural schematic diagram of the present invention;

[0009] Figure 1-2 for Figure 1-1 Left view of;

[0010] Figure 1-3 for Figure 1-1 A top view of

[0011] Figure 2-1 This is a schematic diagram of the upper lining tile;

[0012] Figure 2-2 for Figure 2-1 Left view of;

[0013] Figure 3-1 This is a schematic diagram of the lower lining tile;

[0014] Figure 3-2 for Figure 3-1 Left view of;

[0015] Figure 4-1 It is a schematic diagram of a rounded corner pressing block;

[0016] Figure 4-2 for Figure 4-1 Sectional view at the AA position;

[0017] Figure 5 It is a schematic diagram of placing the fillet pressure block liner abrasive belt strip on the fillet of the undercut groove;

[0018] Figure 6 Schematic diagram of the handle overlap method. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings, as shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4, Figure 5 , Figure 6As shown, it includes an upper lining 3, a lower lining 6, and a rotary shaft 11. The upper lining 3 and the lower lining 6 are connected by the rotary shaft 11. The upper and lower linings rotate around the rotary shaft as the axis to achieve closing and opening; the upper lining of FIG2 is designed with flanges at both ends, and the lower lining of FIG3 is designed with corresponding grooves at both ends. After the upper and lower linings are closed, the flanges and the grooves cooperate to play a limiting role; it includes an axial positioning block 2, a clamping block 7, a rounded corner pressing block 9, and an abrasive belt strip 10. The rounded corner pressing block 9 is two long strip-shaped polyurethane blocks, which are fixedly installed in the positioning grooves of the upper lining 3 and the lower lining 6 respectively. After the upper and lower linings are closed into a full circle, the two rounded corner pressing blocks are symmetrically distributed at 180° on the circumference; the rounded corner pressing block 9 faces the crankshaft journal and the rounded corner of the journal countersunk groove, and is set according to the arc shape of the crankshaft journal arc and the rounded corner of the journal countersunk groove; The two axial positioning blocks 2 are connected by screws 1 respectively, and are fixedly installed on one end surface of the upper and lower lining tile positioning grooves, so as to limit the axial movement of the fillet pressure block 9. At the same time, one end of the abrasive belt is passed through between the axial positioning block 2 and the fillet pressure block 9, and the screw 2 is tightened to clamp the abrasive belt to fix it; the two clamping blocks 7 are connected by screws 8 respectively, and are fixedly installed on the other end surface of the upper lining tile 3 and the lower lining tile 6 positioning grooves respectively, and one end of the abrasive belt 10 is passed through between the clamping block 7 and the fillet pressure block 9, and the screw 8 is tightened to clamp the abrasive belt 10 to fix it; it includes a handle 4 and an elastic adjustment device, the two handles are connected to the upper and lower lining tiles respectively by threads, and the two ends of the elastic adjustment device are connected to the upper and lower handles; the handle is placed on a hub 20 fixed on a polished rod on the machine tool, and the hub can move axially along the polished rod;

[0020] The elastic adjustment device includes a trapezoidal rod 14, the upper end of the trapezoidal rod is fixed to the upper handle, the lower end of the trapezoidal rod is sleeved with a screw sleeve 13, the inner side of the screw sleeve is connected to the bolt 12, the lower side of the bolt is connected to the upper side of the tension spring 5, and the lower side of the tension spring 5 is fixed to the lower handle.

[0021] The working principle of the present invention is as follows: the end of the sand belt strip facing outward with the gravel surface is passed through the axial positioning block and then the screws are tightened to fix it; the fillet pressing block is placed in the positioning grooves of the upper and lower linings, and the end of the fillet pressing block that is not in the shape of the journal fillet squeezes the sand belt strip against the axial positioning block, and the other end of the sand belt strip is passed through the pressing block and the tightness of the sand belt strip is adjusted to make the sand belt strip flat and close to the surface of the fillet pressing block, and then the screws are tightened to fix it. At this time, the shape of the sand belt strip is consistent with the fillet of the crankshaft journal; when in use, the crankshaft is hoisted to the polishing On the machine tool, after the two ends are positioned and clamped, the upper lining of the journal countersink groove fillet polishing device is opened and placed on the fillet of the journal countersink groove. The fillet pressure block pads the sanding belt strip and fits the fillet of the journal countersink groove. The two handles are merged, the upper and lower linings are closed, and the upper and lower lining flanges and grooves are matched together. The two fillet pressure blocks are located on the fillet of the journal countersink groove; the fillet pressure blocks are set according to the different arc sizes on the fillet of the journal countersink groove, and the sanding belt strip can fit well on the entire fillet of the countersink groove. The two fillet pressure blocks are symmetrically distributed 180° on the entire journal countersink groove fillet polishing device, and the polishing force is uniform; the elastic adjustment device on the handle adjusts the distance and then adjusts the tension of the tension spring, and finally adjusts the polishing pressure of the fillet pressure block. After adjustment, start the machine tool, and the handle is placed on a hub on the polished rod fixed on the machine tool. The hub can move axially along the polished rod, and the crankshaft and the journal countersink groove fillet polishing device rotate relatively to achieve overall polishing of the crankshaft journal countersink groove fillet. The polishing amount of the journal countersink groove fillet is uniform, the polishing process is stable, the size and quality of the journal countersink groove fillet are stable, and the production efficiency is high to meet the production needs.

Claims

1. A polishing device with pre-adjusted pressure, characterized in that: It includes an upper lining, a lower lining, and a rotary shaft. The upper lining and the lower lining are connected by a rotary shaft. The upper and lower linings rotate around the rotary shaft to achieve closing and opening. It also includes an axial positioning block, a clamping block, a rounded corner pressing block, and an abrasive belt. The rounded corner pressing block is two long strip-shaped polyurethane blocks, which are respectively fixedly installed in the positioning grooves of the upper lining and the lower lining. After the upper and lower linings are closed into a full circle, the two rounded corner pressing blocks are symmetrically distributed at 180° on the circumference. The rounded corner pressing block faces the crankshaft journal and the rounded corner of the journal countersunk groove, and is configured according to the arc shape of the crankshaft journal arc and the rounded corner of the journal countersunk groove. The two axial positioning blocks are respectively It is fixedly installed on one end surface of the upper and lower lining tile positioning grooves by screws, which plays a role in limiting the axial movement of the fillet pressure block. At the same time, one end of the abrasive belt is passed through the axial positioning block and the fillet pressure block, and the screw is tightened to clamp the abrasive belt to play a fixing role; the two clamping blocks are respectively connected by screws and fixedly installed on the other end surfaces of the upper and lower lining tile positioning grooves respectively. The other end of the abrasive belt is passed through the clamping block and the fillet pressure block, and the screw is tightened to clamp the abrasive belt to play a fixing role; it also includes a handle and an elastic adjustment device. The two handles are respectively connected to the upper and lower lining tiles by threads, and the two ends of the elastic adjustment device are connected to the upper and lower handles; The elastic adjustment device comprises a trapezoidal rod, the upper end of the trapezoidal rod is fixed to the upper handle, the lower end of the trapezoidal rod is sleeved with a screw sleeve, the inner side of the screw sleeve is connected to a bolt, the lower side of the bolt is connected to the upper side of the tension spring, and the lower side of the tension spring is fixed to the lower handle; The handle is placed on a hub on a polished rod fixed on a machine tool. The hub can move axially along the polished rod. The crankshaft and the journal countersink groove fillet polishing device rotate relatively to achieve overall polishing of the crankshaft journal countersink groove fillet.

2. The polishing device with pre-adjusted pressure according to claim 1, characterized in that: Both ends of the upper lining tile are designed with flanges, and both ends of the lower lining tile are designed with corresponding grooves. After the upper and lower lining tiles are closed, the flanges and the grooves cooperate to play a limiting role.

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