Ceramic grinding wheel for valve grinding

Abstract

The utility model belongs to the field of grinding wheels, and particularly relates to a ceramic grinding wheel for valve grinding, which comprises a grinding wheel main body with a grinding wheel center hole in the middle, and is characterized in that a front group of fixing holes and a rear group of fixing holes are arranged on the inner wall of the grinding wheel center hole, each group of fixing holes comprises two fixing blind holes which are symmetrically arranged, a clamping mechanism is arranged in the center hole of the grinding wheel and comprises a hollow cylindrical base, the outer diameter of the base is matched with the inner diameter of the center hole of the grinding wheel, and limiting through holes matched with the fixing holes in the grinding wheel are formed in the side face of the base. Four bolts penetrate through the limiting through holes and the fixing blind holes respectively to connect the base and the grinding wheel together. The grinding machine has the advantages of reasonable structure, safety in use, flexibility, convenience, good stability and high grinding precision.

Description

Technical Field

[0001] The utility model belongs to the field of grinding wheels, and particularly relates to a ceramic grinding wheel for valve grinding. Background Art

[0002] A ceramic grinding wheel (ceramic bond grinding wheel) is a high-performance grinding tool, which is widely used in various industrial fields, especially showing its unique advantages when dealing with high-hardness materials. With its characteristics of high hardness, heat resistance, oil resistance, water resistance, acid and alkali resistance, as well as good self-sharpening and dressability, this grinding wheel plays an important role in industrial grinding, polishing, grinding and other fields.

[0003] As an important component of a fuel engine, valves are mainly used in the fields of automobiles, agricultural machinery, generators, etc. After the valves are manufactured, their surfaces need to be ground. At present, it is common to install a ceramic grinding wheel on the rotating shaft of a grinding machine to grind the valves. The fit between the center hole of the grinding wheel and the rotating shaft of the grinding machine has a great influence on the grinding accuracy. Once the fit between the center hole of the grinding wheel and the rotating shaft of the grinding machine is not good, the grinding wheel is likely to loosen during use, resulting in poor stability during operation and affecting the grinding accuracy. That is, the processing accuracy of the center hole of the ceramic grinding wheel for grinding valves is high and difficult. Moreover, when tightening the bolts of the grinding wheel flange, the bolts cannot be tightened too tightly, otherwise the grinding wheel may crack due to stress concentration. When using multiple bolts to fasten the flange, the operation requirements are high and difficult, and the bolts need to be gradually tightened several times in a diagonal order. If the screws are tightened sequentially along the circumference or tightened all at once, the grinding wheel will be unevenly stressed and may break. Moreover, when tightening the bolts, only a standard wrench can be used, and an extension wrench or a method of hitting cannot be used to increase the tightening force. Content of the Utility Model

[0004] The purpose of the utility model is to provide a ceramic grinding wheel for valve grinding, which is provided with a clamping mechanism inside the center hole of the grinding wheel. The clamping structure is a metal product, and the fit accuracy between its center hole and the rotating shaft of the grinding machine is high. When the grinding wheel is installed on the grinding machine, the bolts for fastening the flange contact the side of the clamping mechanism and do not contact the grinding wheel, with low installation difficulty and no damage to the grinding wheel.

[0005] The utility model is realized by the following technical solutions:

[0006] That is, a ceramic grinding wheel for valve grinding, including a grinding wheel body, a grinding wheel center hole is provided in the middle of the grinding wheel body. It is characterized in that two groups of fixing holes are provided on the inner wall of the grinding wheel center hole. Each group of fixing holes includes two symmetrically arranged fixing blind holes. The first group of fixing holes is close to the front side of the grinding wheel, and the second group of fixing holes is close to the rear side of the grinding wheel. The center lines of the two groups of fixing holes are vertically arranged. A clamping mechanism is provided in the grinding wheel center hole. The clamping mechanism includes a hollow cylindrical base. The outer diameter of the base matches the inner diameter of the grinding wheel center hole. A limiting through hole matching the fixing holes on the grinding wheel is provided on the side of the base. 4 bolts respectively pass through the limiting through hole and the fixing blind hole to connect the base and the grinding wheel together.

[0007] The center lines of the two groups of fixing holes of the present utility model are vertically arranged, that is, the 4 fixing blind holes are projected along the center line direction of the grinding wheel center hole and are equally distributed on the circumferential circle.

[0008] The base of the present utility model is installed inside the grinding wheel center hole. The base and the grinding wheel are connected into an integral structure by bolts. When the grinding wheel is installed on the grinding machine through the cylindrical base, the flange bolts on both sides do not contact the side of the grinding wheel, which will not cause local stress concentration, and the grinding wheel is not easy to burst.

[0009] The base of the present utility model is a metal product. Compared with the inner hole of the grinding wheel center hole, its processing accuracy is higher and the processing difficulty is reduced. Its cooperation with the grinding machine rotating shaft is good, the stability of the grinding wheel during operation is good, and the grinding accuracy is improved.

[0010] When the base and the grinding wheel of the present utility model are installed, the two groups of limiting through holes and the two groups of fixing holes need to be aligned respectively. The processing accuracy requirements for the axial distance between the two groups of limiting through holes on the base are very high. To solve this problem, further, the base of the present utility model is divided into two parts and consists of two mounting seats. Each mounting seat is provided with two symmetrically arranged limiting through holes. The adjacent ends of the two mounting seats are clamped by a convex block and a concave groove, that is, the inner end of one mounting seat is provided with an outwardly protruding convex block, and the inner end of the other mounting seat is provided with a corresponding concave groove. The outer contours of the convex block and the concave groove match.

[0011] The present utility model divides the base into two mounting seats. Each mounting seat is provided with a group of limiting through holes. The distance between the two mounting seats is adjustable, so that the distance between the two groups of limiting through holes is adjustable (as long as the convex block and the concave groove are not separated), reducing the installation difficulty.

[0012] Further, the inner ends of the two mounting seats of the present utility model are simultaneously provided with an outwardly protruding convex block and a concave groove.

[0013] When the two mounting seats are connected, the convex block and the concave groove are inserted and matched with each other to ensure that the two mounting seats rotate synchronously.

[0014] Furthermore, inner concave plate grooves and outer concave plate grooves corresponding in setting positions are provided at the inner end and the outer end of the mounting seat of the present utility model. A pressure relief mechanism is respectively arranged in each inner concave plate groove. The pressure relief mechanism includes a pressure relief cover plate, a guide post and a compression spring. The pressure relief cover plate matches the contour of the inner concave plate groove. A plurality of guide grooves are provided on the groove wall of the inner concave plate groove. A guide block protruding outwards is provided on the side surface of the pressure relief cover plate. A guide post is arranged in the middle of the inner concave plate groove. Threads are provided at both ends of the guide post. A threaded blind hole is provided in the middle of the inner end surface of the pressure relief cover plate. The inner end of the guide post is threadedly connected with the pressure relief cover plate. A guide post hole penetrating through the seat body is provided at the bottom of the inner concave plate groove. The outer end of the guide post passes through the guide post hole at the bottom of the groove and extends into the outer concave plate groove. A nut is installed at the outer end of the guide post. A compression spring is sleeved on the guide post in the inner concave plate groove.

[0015] When the inner ends of the two mounting seats are inserted and matched, the pressure relief cover plate provides a pressure relief function under the action of the compression spring, preventing the first convex plate block from being inserted to the bottom, facilitating the adjustment of the axial position of the mounting seat, and facilitating the alignment of the limit through hole and the fixed blind hole.

[0016] Furthermore, the cross sections of the guide block and the guide groove of the present utility model are T-shaped with the same contour.

[0017] The present utility model has the advantages of reasonable structure, safe use, flexibility, good stability and high grinding accuracy. After using the present utility model, the grinding wheel is installed on the grinding machine through the base. The matching accuracy between the central hole of the base and the rotating shaft of the grinding machine is high, and it is not easy to loosen during use, reducing the possible position deviation during grinding, which is beneficial to improving the grinding accuracy. The bolts of the fastening flange contact the base, and the grinding wheel will not burst due to stress concentration on the side, which can better ensure the safety of the grinding machine operator. Description of the Drawings

[0018] Figure 1 is the structural schematic diagram of the present utility model;

[0019] Figure 2 is Figure 1 the cross-sectional structural schematic diagram of;

[0020] Figure 3 is the structural schematic diagram of the grinding wheel body of the present utility model;

[0021] Figure 4 is the structural schematic diagram of the first mounting seat of the present utility model;

[0022] Figure 5 is Figure 4 the cross-sectional structural schematic diagram of;

[0023] Figure 6 is the structural schematic diagram of the pressure relief cover plate of the present utility model;

[0024] Figure 7Structural schematic diagram of the pressure relief mechanism of the present utility model;

[0025] Figure 8 Structural schematic diagram of the pressure relief mechanism of the present utility model installed on the first mounting seat;

[0026] Figure 9 is Figure 8 Structural schematic diagram of the other end of the first mounting seat in

[0027] As shown in the figure: 1. Grinding wheel body; 12. Grinding wheel center hole; 13. Fixed blind hole; 2. Clamping mechanism; 21. First mounting seat; 22. Inner concave groove; 221. Guide groove; 23. Convex block; 24. Limit through hole; 25. Guide post hole; 26. Outer concave groove; 27. Second mounting seat 3. Pressure relief mechanism; 31. Pressure relief cover plate; 311. Guide block; 312. Threaded blind hole; 32. Guide post; 33. Compression spring; 34. Nut; 4. Bolt. Specific embodiments

[0028] The embodiments of the technical solution of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present utility model more clearly, so they are only examples and cannot be used to limit the protection scope of the present utility model. It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present utility model belongs.

[0029] As Figure 3 shown: The grinding wheel body 1 is a ceramic bond grinding wheel. There is a grinding wheel center hole 12 in the middle position of the grinding wheel body 1. There are two groups of fixing holes on the inner wall of the grinding wheel center hole 12. Each group of fixing holes includes two symmetrically arranged fixed blind holes 13. The first group of fixing holes is 150 mm away from the front end face of the grinding wheel, and the second group of fixing holes is 150 mm away from the rear end face of the grinding wheel. And the center lines of the two groups of fixing holes are vertically arranged.

[0030] As Figure 1 shown: A clamping mechanism 2 is arranged in the grinding wheel center hole 12. The clamping mechanism 2 includes a hollow cylindrical base.

[0031] As Figure 2 shown: The base is divided into two parts and consists of a first mounting seat 21 and a second mounting seat 27. The structures of the two mounting seats are the same.

[0032] As Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9As shown below: Taking the first mounting base 21 as an example for illustration, there are two symmetrically arranged limiting through holes 24 penetrating the side walls on the first mounting base 21. At the inner end of the first mounting base 21, there are two symmetrically arranged arc-shaped convex plate blocks 23 and two symmetrically arranged arc-shaped inner concave plate grooves 22. At the outer end of the first mounting base 21, there are two symmetrically arranged outer concave plate grooves 26 corresponding to the positions of the inner concave plate grooves 22. A pressure relief mechanism 3 is respectively arranged in the two inner concave plate grooves 22. The pressure relief mechanism 3 includes a pressure relief cover plate 31, a guide post 32 and a compression spring 33. The pressure relief cover plate 31 matches the contour of the inner concave plate groove 22. There are multiple guide grooves 221 with a T-shaped cross-section arranged on the groove wall of the inner concave plate groove 22. On the side surface of the pressure relief cover plate 31, there are outwardly protruding guide blocks 311 with a T-shaped cross-section. The positions and quantities of the guide blocks 311 match those of the guide grooves 221. In the middle of the bottom of the inner concave plate groove 22, there is a guide post hole 25, which penetrates the inner concave plate groove 22 and the outer concave plate groove 26. Both ends of the guide post 32 are provided with threads. In the middle of the inner end surface of the pressure relief cover plate 31, there is a threaded blind hole 312. The inner end of the guide post 32 is inserted into the threaded blind hole 312 and tightened, and the guide post 32 is threadedly connected to the pressure relief cover plate 31. The outer end of the guide post 32 passes through the guide post hole 25 and extends into the outer concave plate groove 26. A nut 34 is installed at the outer end of the guide post 32. A compression spring 33 is sleeved on the guide post 32 in the inner concave plate groove 22. In the initial state, under the action of the compression spring 33, the upper end surface of the pressure relief cover plate 31 is flush with the inner end surface of the first mounting base.

[0033] The present utility model is assembled. As Figure 2 shown below: First, insert the first mounting base 21 into the front side of the grinding wheel center hole 12, with its inner end pointing to the rear of the grinding wheel center hole. Rotate the first mounting base 21 so that the two limiting through holes 24 are aligned with the two corresponding fixed blind holes 13. Use bolts 4 to pass through the limiting through holes 24 and the fixed blind holes 3 for fixation. Insert the second mounting base 26 into the front side of the grinding wheel center hole 12, with its inner end pointing to the front of the grinding wheel center hole. Rotate the second mounting base 26, and after rotating it 90°, push it forward until the convex plate blocks 23 of the two mounting bases are respectively inserted into the inner concave plate grooves 22 of the other mounting base until the inner ends of the two mounting bases are in contact. Observe whether the two limiting through holes 4 of the second mounting base 26 are aligned with the two corresponding fixed blind holes 13 at the corresponding positions. If they are aligned, use bolts 4 to pass through the limiting through holes 24 and the fixed blind holes 3 for fixation. If it is found that they are not aligned, reduce the pressure of the finger on the second mounting base 26. Under the action of the pressure relief cover plate 31 and the compression spring 33 of the pressure relief mechanism 3, the second mounting base 26 can slowly move outward. When it is found that the two limiting through holes 4 of the second mounting base 26 are aligned with the two corresponding fixed blind holes 13 at the corresponding positions, use bolts 4 to pass through the limiting through holes 24 and the fixed blind holes 3 for fixation.

[0034] After the utility model is assembled, it can be installed on a grinding machine. The rotating shaft of the grinding machine passes through the central hole of the base, and the installation position of the bolts of the fixed flange is on the side of the base, which will not cause stress concentration on the side of the grinding wheel body 1.

[0035] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model, and they should all be covered by the scope of the claims and the description of the present utility model.

Claims

1. A ceramic grinding wheel for valve grinding, including a grinding wheel body, and a grinding wheel center hole is provided in the middle of the grinding wheel body, characterized in that There are two sets of fixing holes, front and back, on the inner wall of the center hole of the grinding wheel. Each set of fixing holes includes two symmetrically arranged fixing blind holes. The first set of fixing holes is close to the front side of the grinding wheel, and the second set of fixing holes is close to the back side of the grinding wheel. The center lines of the two sets of fixing holes are perpendicularly arranged. A clamping mechanism is provided in the center hole of the grinding wheel. The clamping mechanism includes a hollow cylindrical base. The outer diameter of the base matches the inner diameter of the center hole of the grinding wheel. The side of the base is provided with limiting through holes that match the fixing holes on the grinding wheel. Four bolts respectively pass through the limiting through holes and the fixing blind holes to connect the base and the grinding wheel together.

2. The ceramic grinding wheel for valve grinding according to claim 1, wherein The base is divided into two parts and consists of two mounting seats. The adjacent ends of the two mounting seats are clamped by a convex block and a concave groove, that is, the inner end of one mounting seat is provided with a convex block protruding outward, and the inner end of the other mounting seat is provided with a corresponding concave groove. The outer contours of the convex block and the concave groove match.

3. The ceramic grinding wheel for valve grinding according to claim 2, characterized in that Both the inner ends of the two mounting seats are provided with a convex block and a concave groove protruding outward at the same time.

4. A ceramic grinding wheel for valve grinding according to claim 2 or 3, characterized in that Inner concave grooves and outer concave grooves with corresponding positions are provided at the inner and outer ends of the mounting seat. A pressure relief mechanism is respectively provided in each inner concave groove. The pressure relief mechanism includes a pressure relief cover plate, a guide post, and a compression spring. The pressure relief cover plate matches the contour of the inner concave groove. Multiple guide grooves are provided on the groove wall of the inner concave groove. The side of the pressure relief cover plate is provided with a guide block protruding outward. A guide post is provided in the middle of the inner concave groove. Threads are provided at both ends of the guide post. A threaded blind hole is provided in the middle of the inner end face of the pressure relief cover plate. The inner end of the guide post is threadedly connected to the pressure relief cover plate. A guide post hole penetrating the seat body is provided at the bottom of the inner concave groove. The outer end of the guide post passes through the guide post hole at the bottom of the groove and extends into the outer concave groove. A nut is installed at the outer end of the guide post. A compression spring is sleeved on the guide post in the inner concave groove.

5. A ceramic grinding wheel for valve grinding according to claim 4, characterized in that The guide block and the guide groove are T-shaped with the same contour in cross section.

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