Gearbox seal of coal mill

Abstract

The utility model discloses a coal mill gearbox seal, which belongs to the technical field of gearbox seals and comprises a bearing seat, a rotating shaft is arranged in the middle of the bearing seat, a key groove is arranged on the side edge of the rotating shaft, a shaft sleeve is nested on the surface of the side edge of the rotating shaft, and clamping blocks are arranged on two sides of the inner wall of the shaft sleeve. The shaft sleeve is installed at the side end of the rotating shaft, the clamping block is clamped into the key groove to avoid falling off easily, the shaft sleeve is arranged on the surface of the rotating shaft, the shaft sleeve can be directly replaced when being abraded, the rotating shaft is not abraded, and therefore cost for repairing the rotating shaft is saved, the rotating shaft is not damaged, and the strength of the shaft is guaranteed. In the repairing process, the strength of the shaft is possibly damaged due to uneven heating, the service life of equipment is prolonged, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gearbox seals, and in particular relates to a coal mill gearbox seal. Background Art

[0002] The high-speed shaft input end and the low-speed output shaft of the coal mill gearbox are respectively equipped with oil seals, which play a dynamic and static sealing role during the operation of the gearbox to prevent leakage of lubricating oil. Due to long-term operation and the high temperature inside the gearbox, the oil seal and the high and low-speed shafts are in relative friction, and the shaft diameter is worn and grooves are formed, resulting in poor sealing. After the seal is damaged, there is oil leakage. The previous treatment method is to laser repair the worn areas of the high and low-speed shafts and then replace the oil seals, but the cost of laser repair is high, there are different degrees of wear on the shaft, grooves on the shaft diameter, and the oil seals are hardened, cracked, and damaged. Utility Model Content

[0003] In order to solve the problems raised in the above background technology, the utility model provides a coal mill gearbox seal, which has the characteristics of effectively playing a sealing role, good sealing effect, no oil leakage, and improving the reliability of the coal mill gearbox.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a coal mill gearbox seal, comprising a bearing seat, a rotating shaft is arranged in the middle of the bearing seat, two keyways are symmetrically arranged on the side of the rotating shaft, a shaft sleeve is embedded in the side surface of the rotating shaft, two clamping blocks are symmetrically arranged on the inner wall of the shaft sleeve, and the two clamping blocks correspond to the positions of the two keyways respectively.

[0005] Preferably, the diameter of the sleeve is consistent with the diameter of the rotating shaft.

[0006] Preferably, two limit blocks are symmetrically arranged inside the sleeve, each limit block has a slope at the bottom, each limit block has a pin hole at the lower end, and a fixing component is arranged in the middle of each key slot, the fixing component includes a receiving slot, a return spring and a fixing pin, wherein receiving slots are arranged on both sides of the rotating shaft, and the receiving slots are located in the middle of the key slot, a return spring is arranged in the middle of the receiving slot, and a fixing pin is arranged on the side of the return spring.

[0007] Preferably, the fixing assembly further comprises a spring pressure plate and a fastening bolt, wherein both ends of the return spring are connected with a spring pressure plate, and the spring pressure plate is fastened to the rotating shaft and the fixing pin respectively by the fastening bolts.

[0008] Preferably, under the elastic force of the return spring, half of the length of the fixing pin is always located in the keyway.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. The utility model installs the sleeve on the side end of the rotating shaft, and the block is inserted into the keyway to prevent it from falling off easily. By arranging the sleeve on the surface of the rotating shaft, the sleeve can be directly replaced if it is worn, and the rotating shaft will not be worn, thereby saving the cost of repairing the rotating shaft, and the rotating shaft will not be damaged, ensuring the strength of the shaft. In the repair process, uneven heating may damage the strength of the shaft, thereby extending the service life of the equipment and saving costs;

[0011] 2. The utility model sets a fixing component, the shaft sleeve is nested on the surface of the rotating shaft, the limit block is inserted into the keyway, and the fixing pin is inserted into the pin hole under the elastic force of the reset spring to prevent the limit block from moving in the keyway, thereby ensuring that the shaft sleeve is firmly fixed and stable in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the shaft sleeve fixing structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the fixing assembly of the utility model;

[0016] Figure 4 For this utility model Figure 3 Enlarged view of point A. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present utility model, it should be noted that the terms "middle", "upper", "lower", "one side", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model; in addition, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Example 1

[0020] See also Figure 1-4 The utility model provides the following technical solutions: a coal mill gearbox seal comprises a bearing seat 3, a rotating shaft 2 is arranged in the middle of the bearing seat 3, two keyways 4 are symmetrically arranged on the side of the rotating shaft 2, a shaft sleeve 1 is embedded in the side surface of the rotating shaft 2, two clamping blocks 5 are symmetrically arranged on the inner wall of the shaft sleeve 1, and the two clamping blocks 5 correspond to the positions of the two keyways 4 respectively.

[0021] Specifically, the diameter of the sleeve 1 is consistent with the diameter of the rotating shaft 2 .

[0022] By adopting the above technical solution, the rotation stability of the rotating shaft 2 is ensured.

[0023] When the present embodiment is used, the sleeve 1 is installed at the side end of the rotating shaft 2, and the clamping block 5 is clamped into the key slot 4 to prevent it from falling off easily. By arranging the sleeve 1 on the surface of the rotating shaft 2, the sleeve 1 can be directly replaced if it is worn, and the rotating shaft 2 will not be worn, thereby saving the cost of repairing the rotating shaft 2, and the rotating shaft 2 will not be damaged, ensuring the strength of the shaft, avoiding the possibility of uneven heating during the repair process to damage the strength of the shaft, extending the service life of the equipment, and saving costs;

[0024] Example 2

[0025] The difference between this embodiment and embodiment 1 is that two limit blocks 7 are symmetrically arranged inside the sleeve 1, and the bottom of the two limit blocks 7 is provided with a slope, and the lower end of each limit block 7 is provided with a pin hole 8, and a fixing component 6 is arranged in the middle of the key slot 4, and the fixing component 6 includes a receiving groove 61, a return spring 63 and a fixing pin 65, wherein receiving grooves 61 are arranged on both sides of the rotating shaft 2 in the middle of the key slot 4, a return spring 63 is arranged in the middle of the receiving groove 61, and a fixing pin 65 is arranged on the side of the return spring 63.

[0026] By adopting the above technical solution, the limit block 7 is inserted into the key slot 4, and the fixing pin 65 is inserted into the pin hole 8 under the elastic force of the return spring 63, so as to prevent the limit block 7 from moving in the key slot 4, ensure that the sleeve 1 is firmly fixed and stable in use.

[0027] Specifically, the fixing assembly 6 also includes a spring pressure plate 62 and a fastening bolt 64 , wherein both ends of the return spring 63 are connected to the spring pressure plate 62 , and the two spring pressure plates 62 are fastened to the rotating shaft 2 and the fixing pin 65 respectively through the fastening bolts 64 .

[0028] By adopting the above technical solution, it is ensured that both ends of the return spring 63 are respectively firmly fixed to the rotating shaft 2 and the fixing pin 65.

[0029] Specifically, under the elastic force of the return spring 63 , half of the length of the fixing pin 65 is always located in the key slot 4 .

[0030] By adopting the above technical solution, through the slope at the bottom of the limit block 7, the limit block 7 can push the fixing pin 65 to squeeze the reset spring 63 when moving downward; when the limit block 7 is fully inserted into the key slot 4, the fixing pin 65 is inserted into the pin hole 8 under the elastic force of the reset spring 63, preventing the limit block 7 from falling off.

[0031] When this embodiment is used, the sleeve 1 is nested on the surface of the rotating shaft 2, the limit block 7 is inserted into the key slot 4, and the fixing pin 65 is inserted into the pin hole 8 under the elastic force of the return spring 63 to prevent the limit block 7 from moving in the key slot 4, thereby ensuring that the sleeve 1 is firmly fixed and stable in use.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Coal mill gearbox seal, including bearing seat, characterized by: A rotating shaft is arranged in the middle of the bearing seat, two keyways are symmetrically arranged on the side of the rotating shaft, a shaft sleeve is embedded on the side surface of the rotating shaft, two clamping blocks are symmetrically arranged on the inner wall of the shaft sleeve, and the two clamping blocks correspond to the positions of the two keyways respectively.

2. The coal mill gearbox seal according to claim 1, characterized in that: The diameter of the shaft sleeve is consistent with the diameter of the rotating shaft.

3. The coal mill gearbox seal according to claim 1, characterized in that: Two limit blocks are symmetrically arranged inside the sleeve, each limit block has a slope at the bottom, a pin hole is arranged at the lower end of each limit block, a fixing component is arranged in the middle of each key slot, and the fixing component includes a receiving slot, a return spring and a fixing pin, wherein receiving slots are arranged on both sides of the rotating shaft, and the receiving slots are located in the middle of the key slot, a return spring is arranged in the middle of the receiving slot, and a fixing pin is arranged on the side of the return spring.

4. The coal mill gearbox seal according to claim 3, characterized in that: The fixing assembly also includes a spring pressure plate and a fastening bolt, wherein both ends of the return spring are connected with the spring pressure plate, and the spring pressure plate is fastened to the rotating shaft and the fixing pin respectively through the fastening bolts.

5. The coal mill gearbox seal according to claim 3, characterized in that: Under the elastic force of the return spring, half of the length of the fixing pin is always located in the keyway.

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