Bearing dustproof heat insulation structure in gem sintering production

Abstract

The utility model belongs to the technical field of gem production, and provides a bearing dustproof heat insulation structure in gem sintering production, the bearing dustproof heat insulation structure comprises a dustproof cap and a framework oil seal, the dustproof cap is made of a high-temperature-resistant heat insulation material containing polytetrafluoroethylene and is a cylinder with a conical upper section, and a shaft hole in small clearance fit with a lifting rod is formed in the center of the dustproof cap; a plurality of circles of square ring grooves and sealing ring grooves are formed in the inner side of the shaft hole, and a plurality of circles of framework oil seals are mounted in the sealing ring grooves; the dustproof cap is fixed to the upper end of the bearing outer sleeve through a screw. The bearing dustproof heat insulation structure plays a role in heat insulation and dust prevention on the linear bearing of the lifting rod, the service life of lubricating grease is prolonged, stable lifting of the lifting rod is guaranteed, the stability of gem growth and crystallization is enhanced, and the percent of pass of gem products is increased.

Description

Technical Field

[0001] The present application belongs to the technical field of gemstone sintering production, and specifically relates to a bearing dustproof and heat-insulating structure in gemstone sintering production. Background Art

[0002] Flame fusion sintering of gemstones is a production process in the field of artificial gemstones. Its principle is to heat and melt high-purity alumina powder at a high temperature of 2500~3000℃ generated by the combustion of pure hydrogen and pure oxygen, and then crystallize into gemstone crystal rods under the guidance of seed crystals in a strictly controlled temperature field. The sintering machine is the key equipment for flame fusion sintering of gemstones. Each sintering machine is equipped with multiple lifting rods, each of which is equipped with high-precision linear bearings, and the top of each lifting rod has a platform for placing a support seat, which is used to support the seed crystals and grown crystals required for the growth of gemstones.

[0003] Gemstones grow slowly, and a crystal rod needs to continue growing for several hours. As the gemstone grows, the lifting rod needs to descend to ensure that the crystal crystallization area is always in the core area of ​​the furnace temperature field; and the lifting and lowering of the lifting rod must be kept stable, otherwise the gemstone crystallization growth will be seriously affected.

[0004] During the gemstone growth process, affected by the high temperature of the furnace, the grease in the linear bearing of the lifting rod is prone to deterioration or failure, affecting the bearing lubrication effect;

[0005] In addition, during the production process, residual alumina raw material powder or other solid particles falling from the furnace are easy to adhere to the surface of the lifting rod and follow it into the linear bearing, which can easily cause the lifting rod to rise and fall unsteadily, causing abnormal growth and crystallization of the gemstone, resulting in defective or waste products. Summary of the invention

[0006] The present application proposes a dustproof and heat-insulating structure for bearings in gemstone sintering production, aiming to solve the problem in the prior art that high temperature and dust affect the lubrication of the bearings, resulting in unstable lifting of the lifting rod, abnormal growth and crystallization of the gemstones, and the formation of defective or waste products.

[0007] To achieve the above objectives, this application proposes the following technical solutions:

[0008] The bearing dustproof and heat-insulating structure described in the present application includes a dust cap and a skeleton oil seal. The dust cap is made of high-temperature resistant and heat-insulating materials including polytetrafluoroethylene, and is in the shape of a cylindrical body with a tapered upper section. A shaft hole is provided in the center to match the lifting rod with a small gap. Four or five circles of square ring grooves and sealing ring grooves are provided on the inner side of the shaft hole, and one or two circles of skeleton oil seals are installed in the sealing ring groove. The dust cap is fixed to the upper end of the bearing sleeve by screws.

[0009] Compared with the prior art, the beneficial effects of the bearing dustproof and heat-insulating structure described in this application are:

[0010] The bearing dustproof and heat-insulating structure has the effect of heat insulation and dustproofing for the linear bearing of the lifting rod, prolongs the service life of the grease, ensures the smooth lifting of the lifting rod, enhances the stability of gemstone growth and crystallization, and improves the qualified rate of gemstone products. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of a bearing dustproof and heat-insulating structure in gemstone sintering production described in this application.

[0012] The markings in the figure are explained as follows:

[0013] 1-lifting rod, 2-dust cap, 3-square ring groove, 4-skeleton oil seal, 5-screw, 6-bearing jacket, 7-linear bearing. DETAILED DESCRIPTION

[0014] The specific implementation of the bearing dustproof and heat-insulating structure described in this application is described as follows:

[0015] Combined with Figure 1 The outer side of the lifting rod 1 of the gem sintering machine is covered with a linear bearing 7, and the outer side of the linear bearing 7 is covered with a bearing sleeve 6.

[0016] As shown in the figure, a high temperature resistant heat insulating material including polytetrafluoroethylene is used to prefabricate a cylindrical dust cap 2 with a conical upper section, and the conical upper section is conducive to reducing dust accumulation;

[0017] The dust cap 2 is provided with an axial hole in the center thereof which matches the lifting rod 1 with a small clearance, and the inner side of the axial hole is provided with 4 or 5 circles of square ring grooves 3 and sealing ring grooves, and one or two circles of skeleton oil seals 4 are installed in the sealing ring grooves;

[0018] The square ring groove 3 plays a role similar to a labyrinth seal, and increases the resistance of the hot air and dust outside from entering the linear bearing 7 when the lifting rod 1 is raised or lowered;

[0019] The dust cap 2 is fixed to the upper end of the bearing sleeve 6 by screws 5, and plays a role in heat insulation and dust prevention for the linear bearing 7;

[0020] The skeleton oil seal 4 is in close contact with the surface of the lifting rod 1, which can not only scrape off the grease on the surface of the lifting rod 1 to reduce dust adhesion, but also prevent external hot air and dust from entering the linear bearing 7, further playing a role of heat insulation and dust prevention.

[0021] It should be noted that the above is only one embodiment of the bearing dustproof and heat-insulating structure described in this application. Similar technical solution examples made based on the technical feature principles described in this application should all fall within the protection scope of this application.

Claims

1. A dustproof and heat-insulating structure for bearings in gemstone sintering production, characterized by: The invention comprises a dust cap (2) and a skeleton oil seal (4). The dust cap (2) is made of a high-temperature resistant heat-insulating material including polytetrafluoroethylene, and is a cylindrical body with a tapered upper section. A shaft hole is provided at the center to match the lifting rod (1) with a small gap. Four or five circles of square ring grooves (3) and a sealing ring groove are provided on the inner side of the shaft hole. One or two circles of skeleton oil seals (4) are installed in the sealing ring groove. The dust cap (2) is fixed to the upper end of the bearing sleeve (6) by means of screws (5).

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