Grinding machine

Abstract

The utility model provides a grinding machine. The grinding machine comprises a motor, a speed reducer, a fixed platform and a mold, a first belt wheel is arranged on a motor shaft of the motor, a second belt wheel is arranged on an input shaft of the speed reducer, the first belt wheel and the second belt wheel are connected through a belt, and an output shaft of the speed reducer is connected with the fixed platform. The upper surface of the fixing platform is detachably connected with a mold, and a grinding face is arranged in the mold. According to the utility model, the motor and the speed reducer which can drive the fixed platform and the mold to rotate are arranged, so that the fixed platform and the mold rotate automatically, the sealing surface of the valve core is arranged on the grinding surface, and the valve core is uniformly ground through the self-rotation of the grinding surface, so that the dimensional accuracy of the sealing surface of the valve core is improved, and the roughness of the sealing surface meets the technical requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of hemispherical valve core processing, in particular to a grinding machine. Background Art

[0002] The damage of hemispherical valves used in industry is serious. Most of them are caused by the erosion of fluid medium, which causes the size, shape and surface quality of the valve core and valve seat sealing surface to change, resulting in damage to the valve sealing surface and poor sealing, causing leakage. At present, the main methods for repair are as follows:

[0003] (I) If the valve core and valve seat of the hemispherical valve are directly replaced, because there are many valve specifications and models in different companies, the technical parameters of spare parts are not unified, resulting in incompatibility. The only way is to increase the inventory of each model in preparation for later replacement, which results in a larger storage space and higher procurement costs;

[0004] (ii) Figure 1 As shown, a hemispherical structure is provided on the valve core of the hemispherical valve, and the outer cylindrical surface of the hemispherical structure is the sealing surface A of the valve core. The grinding process is to grind the sealing surface A. When the sealing surface A is damaged and repaired, firstly, a surfacing is applied to the damaged part, and then the weld is polished. The existing polishing method is manual polishing using a grinding wheel machine. Due to the difference in operating experience of workers, especially inexperienced workers, it is easy to cause uneven polishing, so that the surface roughness and dimensional accuracy of the valve core do not meet the requirements, resulting in failure of the assembly pressure acceptance and cannot be put into use again. Utility Model Content

[0005] The utility model aims to provide a grinding machine which can grind a valve core in a self-rotating manner and improve the dimensional accuracy of the sealing surface of the valve core.

[0006] The technical solution of the utility model is: a grinder, comprising a motor, a reducer, a fixed platform and a mold, a first pulley is provided on the motor shaft of the motor, a second pulley is provided on the input shaft of the reducer, the first pulley and the second pulley are connected by a belt, the output shaft of the reducer is connected to the fixed platform, the upper surface of the fixed platform is detachably connected to the mold, and a grinding surface is provided inside the mold.

[0007] Preferably, the grinding surface is a concave curved surface.

[0008] Preferably, an axially through cavity is provided inside the mold, and the cavity includes a first cavity and a second cavity arranged in sequence, the second cavity is placed at the upper end of the first cavity, and the diameter of the second cavity is larger than the diameter of the first cavity, and the inner bottom surface of the second cavity forms the grinding surface.

[0009] Preferably, the reducer is a worm gear reducer.

[0010] Preferably, the mold is connected to the fixed platform via bolts, and a plurality of the bolts are evenly distributed on the circumference of the mold.

[0011] Preferably, sandpaper is attached to the grinding surface.

[0012] Preferably, the fixed platform is disc-shaped and the mold is cylindrical.

[0013] Compared with the related art, the beneficial effects of the utility model are:

[0014] 1. A motor and a reducer are provided to drive the fixed platform and the mold to rotate, so that the fixed platform and the mold rotate by themselves, and the sealing surface of the valve core is placed on the grinding surface. Through the self-rotation of the grinding surface, the valve core is evenly polished, the dimensional accuracy of the sealing surface of the valve core is improved, and the roughness of the sealing surface meets the technical requirements;

[0015] 2. The mold and the fixed platform can be detachably connected, and the corresponding mold can be replaced according to the size of the valve core to improve versatility;

[0016] 3. The reducer uses a worm gear reducer to achieve a high transmission ratio and a large reduction ratio, with high transmission accuracy, making the mold grinding more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the valve core of a hemispherical valve;

[0018] Figure 2 A schematic diagram of the structure of the grinding machine according to the first embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the grinding machine of Example 2 provided by the utility model.

[0020] In the accompanying drawings: 1. motor; 2. reducer; 3. fixed platform; 4. mold; 41. grinding surface; 42. cavity; 421. first cavity; 422. second cavity; 5. first pulley; 6. second pulley; 7. belt; 8. bolt; 9. base. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0022] Embodiment 1

[0023] like Figure 2As shown, a grinding machine provided in this embodiment includes a motor 1, a reducer 2, a fixed platform 3, a mold 4, a first pulley 5, a second pulley 6, a belt 7 and a bolt 8.

[0024] The motor shaft of the motor 1 is provided with a first pulley 5, the reducer 2 is a worm gear reducer, the input shaft of the reducer 2 is provided with a second pulley 6, and the first pulley 5 and the second pulley 6 are connected by a belt 7. The output shaft of the reducer 2 is connected to the fixed platform 3, and the fixed platform 3 is driven to rotate by the output torque of the reducer 2. The fixed platform 3 is disc-shaped.

[0025] The upper surface of the fixed platform 3 is detachably connected to the mold 4 by bolts 8. A plurality of bolts 8 are evenly distributed on the circumference of the mold 4. The mold 4 is a grinding mold, which is cylindrical, and a cavity 42 is provided in the center of the interior. The cavity 42 includes a first cavity 421 and a second cavity 422 arranged in sequence, the second cavity 422 is placed at the upper end of the first cavity 421, and the diameter of the second cavity 422 is greater than the diameter of the first cavity 421. The inner bottom surface of the second cavity 422 forms a concave arc surface, which is a grinding surface 41, and is adapted to the sealing surface A of the valve core of the hemispherical valve.

[0026] During grinding, a layer of sandpaper is attached to the grinding surface 41, and then the valve body is placed in the cavity 42 of the mold 4, so that part of the sealing surface A is attached to the grinding surface 41. When the mold 4 drives the grinding surface 41 to rotate, the sealing surface A is ground automatically. During the grinding process, the valve core is constantly changed in direction by hand so that the other surfaces of the hemispherical sealing surface A are in contact with the grinding surface 41 respectively, until all the surfaces on the sealing surface A that need to be ground are completed, and the motor 1 is stopped.

[0027] Embodiment 2

[0028] like Figure 3 As shown, in a specific application structure, the grinding machine includes a base 9, on which a reducer 2 and a motor 1 are mounted, and the reducer 2 and the motor 1 are connected by a belt 7. The power output shaft of the reducer 2 is placed at the upper end, and the power output shaft is connected to a fixed platform 3, on which a mold 4 is mounted. The grinding machine is installed as a whole through the base 9, which is convenient for overall transportation and installation.

[0029] In addition, the output shaft of the reducer 2 and the fixed platform can be connected through a slewing bearing to better transmit torque.

[0030] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A grinding machine, characterized in that: It includes a motor, a reducer, a fixed platform and a mold. The motor shaft of the motor is provided with a first pulley, the input shaft of the reducer is provided with a second pulley, the first pulley and the second pulley are connected by a belt, the output shaft of the reducer is connected to the fixed platform, the upper surface of the fixed platform is detachably connected to the mold, and the interior of the mold is provided with a grinding surface.

2. The grinding machine according to claim 1, characterized in that The grinding surface is a concave curved surface.

3. The grinding machine according to claim 1, characterized in that An axially penetrating cavity is provided inside the mold, and the cavity includes a first cavity and a second cavity arranged in sequence, the second cavity is placed at the upper end of the first cavity, and the diameter of the second cavity is larger than the diameter of the first cavity, and the inner bottom surface of the second cavity forms the grinding surface.

4. The grinding machine according to claim 1, characterized in that The reducer is a worm gear reducer.

5. The grinding machine according to claim 1, characterized in that The mold is connected to the fixed platform through bolts, and a plurality of the bolts are evenly distributed on the circumference of the mold.

6. The grinding machine according to claim 1, characterized in that Sandpaper is attached to the grinding surface.

7. The grinding machine according to claim 1, characterized in that The fixed platform is disc-shaped, and the mold is cylindrical.

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