Abrasive belt tensioning assembly of grinding machine

Abstract

The utility model relates to an abrasive belt tensioning assembly of a grinding machine. The abrasive belt tensioning assembly of the grinding machine comprises an installation frame, a core shaft, a tensioning shaft and a bearing, the two ends of the core shaft are fixedly arranged on the installation frame, the tensioning shaft is rotationally arranged on the core shaft in a sleeved mode, an inner ring of the bearing is fixedly connected with the core shaft in a sleeved mode, and an outer ring of the bearing rotates along with the tensioning shaft. The abrasive belt tensioning assembly of the grinding machine has the advantages of being long in service life, low in cost and convenient to replace.

Description

Technical Field

[0001] The utility model relates to the field of grinders, in particular to a sanding belt tensioning component of a grinder. Background Art

[0002] The grinding device of the abrasive belt grinding equipment generally includes a lifting mechanism, two tensioning shafts, a grinding shaft, and the same abrasive belt sleeved outside the tensioning shaft and the grinding shaft. The tensioning shaft and the grinding shaft are arranged in a triangle. The lifting mechanism drives the tensioning shaft to move close to or away from the grinding shaft to achieve the purpose of tensioning the abrasive belt. As for the current abrasive belt grinding equipment, the tensioning shaft is generally an integral structure. Both ends of the tensioning shaft are rotatably connected to the mounting frame through bearings, and the lifting mechanism drives the mounting frame to lift and lower, thereby driving the two tensioning shafts to move at the same time. However, due to the cumulative errors in the processing accuracy and assembly accuracy of the mounting frame, the tensioning shaft, and the bearing, the two ends of the tensioning shaft are prone to misalignment. When the tensioning shaft rotates with the movement of the abrasive belt, the tensioning shaft and the bearing, as well as the bearing itself, will scratch due to misalignment, affecting the service life of the bearing. And when the tensioning shaft is worn out and needs to be replaced, the existing integral structure can only be replaced as a whole, which affects production efficiency and is costly. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a belt tensioning assembly for a grinding machine, which has the advantages of long service life and low cost.

[0004] A belt tensioning assembly for a grinder comprises a mounting frame, a core shaft, a tensioning shaft and a bearing. The two ends of the core shaft are fixedly arranged on the mounting frame, the tensioning shaft is rotatably sleeved on the core shaft, the inner ring of the bearing is fixedly sleeved on the core shaft, and the outer ring thereof rotates with the tensioning shaft.

[0005] The position accuracy of the belt tensioning assembly of the grinding machine described in the utility model is directly guaranteed by the machining accuracy of the machine tool, and the cumulative machining error is small, which can reduce the assembly error and avoid the misalignment of the bearing after installation. At the same time, this solution adopts a split structure, and the tensioning shaft can be replaced separately after wear, without replacing the mandrel, which is conducive to reducing costs.

[0006] Furthermore, the mounting frame includes two cantilevers respectively located at the two ends of the mandrel, the cantilevers are provided with coaxially arranged assembly holes, the end of the mandrel passes through the assembly holes and is connected to the baffle, the baffle covers the assembly holes and is connected to the cantilever. This structure facilitates the assembly of the mandrel and avoids the connection points on the cantilever from being incoaxial and generating torsional force on the mandrel.

[0007] Furthermore, a protective cover is provided on the cantilever, an inner cavity is formed between the protective cover and the cantilever, and the baffle is located in the inner cavity. This structure can isolate dust or splashing water vapor and play a protective role.

[0008] Furthermore, a mounting ring is fixedly arranged on the inner wall of the tensioning shaft, a mounting hole is opened in the middle of the mounting ring, the bearing sleeve is arranged in the mounting hole, and its outer ring is clamped with the mounting ring. This structure is convenient for installation or disassembly.

[0009] Furthermore, it also includes a bearing cover, which is arranged at the end of the tensioning shaft and fixed to the mounting ring by screws, so as to protect the internal bearing.

[0010] Furthermore, a sealing ring is sandwiched between the bearing cover and the mounting ring to prevent water mist from penetrating and extend the service life.

[0011] Furthermore, the outer side surface of the bearing cover does not protrude from the end surface of the tensioning shaft, thereby improving the aesthetics and preventing contamination by water mist or dirt.

[0012] Furthermore, a receiving groove is provided in the bearing cover, a shaft seal is received in the receiving groove, and the core shaft is passed through the shaft seal. This structure can prevent dirt from contacting the bearing, thereby achieving the purpose of extending the service life of the bearing.

[0013] Furthermore, the accommodating grooves each accommodate two shaft seals distributed along the axial direction, thereby further improving the sealing effect.

[0014] Furthermore, the core shaft, the bearing and the tensioning shaft are coaxially arranged to ensure that the abrasive belt can be stably tensioned.

[0015] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structural diagram of the abrasive belt tensioning assembly of the utility model;

[0017] Figure 2 It is a partial cross-sectional view of the abrasive belt tensioning assembly of the utility model;

[0018] Figure 3 for Figure 2 A partial enlarged view of the middle A area;

[0019] Figure 4 It is a structural schematic diagram of the abrasive belt grinding device in the grinding machine;

[0020] Explanation of the accompanying drawings: 1. Mounting frame; 11. Cantilever; 12. Protective cover; 2. Core shaft; 3. Tensioning shaft; 31. Mounting ring; 32. Bearing cover; 33. Sealing ring; 34. Shaft seal; 4. Bearing; 5. Lifting mechanism; 6. Grinding shaft; 7. Baffle; 8. Sanding belt. DETAILED DESCRIPTION

[0021] See also Figure 1-4 , Figure 1 This is the overall structural diagram of the abrasive belt tensioning assembly of the utility model; Figure 2 It is a partial cross-sectional view of the abrasive belt tensioning assembly of the utility model; Figure 3 for Figure 2 A partial enlarged view of the middle A area; Figure 4 It is a structural schematic diagram of the grinding device of the grinder.

[0022] The utility model discloses a belt tensioning assembly of a grinding machine, comprising a mounting frame 1, a mandrel 2, a tensioning shaft 3 and a bearing 4, wherein both ends of the mandrel 2 are fixedly arranged on the mounting frame 1, the tensioning shaft 3 is rotatably sleeved on the mandrel 2, the inner ring of the bearing 4 is fixedly sleeved with the mandrel 2, and the outer ring thereof rotates with the tensioning shaft 3. The mandrel 2, the tensioning shaft 3 and the bearing 4 are coaxially arranged, thereby ensuring the stability of the tension of the belt and improving the grinding accuracy.

[0023] The frame of the mounting frame 1 is welded by pipes and plates. In actual use, the mounting frame 1 is connected to the lifting mechanism 5 and driven by the lifting mechanism 5 (such as a hydraulic cylinder, a cylinder, etc.), thereby driving the tensioning shaft 3 to approach or move away from the grinding shaft 6, so that the abrasive belt 8 sleeved on the tensioning shaft 3 and the grinding shaft 6 becomes loose or tensioned. The mounting frame 1 includes two cantilevers 11 respectively located at both ends of the mandrel 2. The cantilevers 11 have two groups and extend to the left and right sides of the mounting frame 1 respectively. The cantilevers 11 on the same side are provided with coaxially arranged assembly holes, and their coaxiality is determined by the processing accuracy. The end of the mandrel 2 passes through the assembly hole and is connected to the baffle 7 by screws. The baffle 7 covers the assembly hole and is connected to the cantilever 11 by screws. Therefore, when the lifting mechanism 5 drives the mounting frame 1 to rise and fall, it can simultaneously drive the two mandrels 2 located on both sides of the mounting frame 1 to rise and fall, thereby driving the tensioning shaft 3 to move.

[0024] The cantilever 11 is also provided with a protective cover 12 for isolating dust or splashing water vapor, and an inner cavity is formed between the protective cover 12 and the cantilever 11, and the baffle 7 and the screw are surrounded in the inner cavity. The protective cover 12 can be provided only on the cantilever 11 at one end of the mandrel 2, or can be provided at both ends of the mandrel 2.

[0025] The tensioning shaft 3 is a circular tubular structure with a hollow interior, and its outer surface is in close contact with the abrasive belt 8. A mounting ring 31 is fixedly provided on the inner wall of the tensioning shaft 3 by welding, so that the mounting ring 31 and the tensioning shaft 3 form a whole. There are two mounting rings 31, which are respectively located at positions of the tensioning shaft 3 close to the openings at both ends. A mounting hole is provided in the middle of the mounting ring 31, and the bearing 4 is detachably mounted in the mounting hole. The bearing 4 includes an outer ring, an inner ring, and rolling balls sandwiched between the outer ring and the inner ring, so that the outer ring can rotate relative to the central axis of the inner ring. The outer ring is clamped with the mounting ring 31, so the outer ring can rotate with the tensioning shaft 3.

[0026] The outer end surface of the mounting ring 31 is also detachably provided with a bearing cover 32, which is sleeved on the core shaft 2 and arranged at the two ends of the tensioning shaft 3, and is fixed to the outer end surfaces of the two mounting rings 31 by screws. In order to ensure the overall aesthetics of the device, the outer side surface of the bearing cover 32 does not protrude from the end surface of the tensioning shaft 3, so that it is hidden inside the tensioning shaft 3.

[0027] Since the sanding belt 8 machine usually needs to be sprayed with water during use, the water mist splashed by the sanding belt 8 during the grinding process can easily bring dirt into the tensioning shaft 3. Therefore, a sealing ring 33 is sandwiched between the bearing cover 32 and the mounting ring 31 to improve its sealing performance and prevent water mist from entering and affecting the service life of the bearing 4 and other structures. A receiving groove is provided in the bearing cover 32, and a shaft seal 34 is accommodated in the receiving groove. The core shaft 2 is inserted into the shaft seal 34, so that while ensuring that the tensioning shaft 3 can rotate quickly relative to the core shaft 2, dirt is prevented from entering the inner cavity of the tensioning shaft 3, which plays a protective role. In order to improve the sealing effect, two shaft seals 34 distributed along the axial direction are accommodated in the receiving grooves of the two bearing covers 32.

[0028] When in use, the mounting frame 1 is mounted on the lifting mechanism 5, and the annular abrasive belt 8 is sleeved on the two tensioning shafts 3 and the grinding shaft 6 connected to the lifting mechanism 5. The layout is usually that the grinding shaft 6 is located at the vertex of a triangle (or an inverted triangle), and the two tensioning shafts 3 are located at the other two end points. When the abrasive belt 8 is too loose and needs to be tensioned, the mounting frame 1 is driven away from the grinding shaft 6 by the lifting structure, so that the abrasive belt 8 is tensioned. When the abrasive belt 8 needs to be loosened, this can be achieved by driving the mounting frame 1 to move in the opposite direction through the lifting structure. When grinding, the abrasive belt 8 is in close contact with the tensioning shaft 3, so when the abrasive belt 8 moves, it will drive the tensioning shaft 3 to rotate relative to the core shaft 2.

[0029] When the tensioning shaft 3 is seriously worn and needs to be replaced, the abrasive belt tensioning assembly is disassembled and only the tensioning shaft 3 is replaced, while other parts can continue to be used, thereby reducing the cost of maintenance and replacement.

[0030] The position accuracy of the belt tensioning assembly of the grinding machine described in the utility model is directly guaranteed by the machining accuracy of the machine tool, and the cumulative machining error is small, which can reduce the assembly error and avoid the misalignment of the bearing after installation. At the same time, this solution adopts a split structure, and the tensioning shaft can be replaced separately after wear, without replacing the mandrel, which is conducive to reducing costs.

[0031] It should be understood that, in the description of the present application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, that is, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, unless otherwise specified, "multiple" means two or more.

[0032] It should be noted that, in the description of this application, unless otherwise clearly specified and limited, the terms "disposed", "connected", "connected", and "hollow" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A belt tensioning assembly for a grinding machine, characterized in that: It includes a mounting frame, a core shaft, a tensioning shaft and a bearing. The two ends of the core shaft are fixedly arranged on the mounting frame. The tensioning shaft is rotatably sleeved on the core shaft. The inner ring of the bearing is fixedly sleeved with the core shaft, and the outer ring thereof rotates with the tensioning shaft.

2. The abrasive belt tensioning assembly of a grinding machine according to claim 1, characterized in that: The mounting frame includes two cantilevers respectively located at two ends of the core shaft, the cantilevers are provided with coaxially arranged assembly holes, the end of the core shaft passes through the assembly holes and is connected to the baffle, and the baffle covers the assembly holes and is connected to the cantilevers.

3. The abrasive belt tensioning assembly of a grinding machine according to claim 2, characterized in that: A protective cover is also provided on the cantilever, an inner cavity is formed between the protective cover and the cantilever, and the baffle is located in the inner cavity.

4. The abrasive belt tensioning assembly of a grinding machine according to claim 2, characterized in that: A mounting ring is fixedly arranged on the inner wall of the tensioning shaft, a mounting hole is opened in the middle of the mounting ring, the bearing sleeve is arranged in the mounting hole, and the outer ring of the bearing is clamped with the mounting ring.

5. The abrasive belt tensioning assembly of a grinding machine according to claim 4, characterized in that: It also includes a bearing cover, which is arranged at the end of the tensioning shaft and fixed to the mounting ring by screws.

6. The abrasive belt tensioning assembly of a grinding machine according to claim 5, characterized in that: A sealing ring is sandwiched between the bearing cover and the mounting ring.

7. The abrasive belt tensioning assembly of a grinding machine according to claim 6, characterized in that: The outer side surface of the bearing cover does not protrude beyond the end surface of the tensioning shaft.

8. The abrasive belt tensioning assembly of a grinding machine according to claim 5, characterized in that: The bearing cover is provided with a receiving groove, a shaft seal is received in the receiving groove, and the core shaft is passed through the shaft seal.

9. The abrasive belt tensioning assembly of a grinding machine according to claim 8, characterized in that: The accommodating grooves each accommodate two shaft seals distributed along the axial direction.

10. The abrasive belt tensioning assembly of a grinding machine according to claim 1, characterized in that: The core shaft, the bearing and the tensioning shaft are coaxially arranged.

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