RU187586U1 - ELECTRIC MEAT GRINDER WITH WORM REDUCER - Google Patents

Abstract

The utility model relates to household appliances and can be used at home and in production conditions for processing a product, namely meat.

An electric meat grinder with a worm gearbox, including a housing, a working body with knives, knife grills, a pressure nut and a screw, an electric motor and a worm gearbox containing an output shaft of an electric motor made in the form of a worm, and a worm wheel, on the axis of which there is a shank for connecting to the screw meat grinders, while the output shaft of the electric motor, the worm wheel and the shank are mounted in the housing of the worm gear using ball bearings, and at the output ends of the shank and the worm are located Threaded rubber rings for oil cooling.

The technical result of the claimed technical solution is to increase efficiency, reduce overheating during prolonged operation at maximum load and reduce noise. 1 ill.

Description

The utility model relates to household appliances and can be used at home and in production conditions for processing a product, namely meat.

The design of meat grinders used in catering and the food industry includes a working body consisting of knives, knife grids and auger and a drive mechanism consisting of an electric motor and gear. As a transmission, V-belt (MIM-250, MIM-82M meat grinders), gear (M2, 764, MIM-300, MMP-P-1 with universal drive P-P), combined (V-belt and gear MIM-500) and a worm gear are used (UMM-2 with universal drive UMM-PR) (Elkhina V.D. et al. Mechanical equipment of public catering enterprises. - M.: Economy, 1981, p. 29-31.).

In domestic and foreign modern designs of meat grinders, a V-belt drive is not used, because their main disadvantage is the fast wear of the belts, associated with slipping them over the pulleys with the dynamic nature of meat chopping (ingress of tendons, pieces of bone, different orientation of the fibers relative to the knife).

The vast majority of designs of household electric meat grinders use the design of a gearbox with a simple gear transmission with straight or oblique teeth, with the number of gears in the drive from 2 to 3. This kind of gearboxes are designed to provide revolutions of the output shaft within 150-200 per minute and efforts on the output shaft from 0 to 300 Nm, to ensure the comfortable operation of the meat grinder operator. Given the various types of engines, the gear ratio of such gearboxes should be from 0.025 to 0.008, depending on the speed of the engine used. In these designs gears are used from various kinds of plastics (mainly ROM), the gear case is made of plastic, and axial sliding bearings are used on the gear axes. Gearboxes of this type are characterized by simplicity of design and calculation, the use of cheap materials for sale, sufficient durability and manufacturability. But, at the same time, they have a number of significant drawbacks, among which one can distinguish a high noise level due to the large number of gears in the drive and vibration that occurs in the gear mesh, as well as the presence of unevenly wearing components (the first gear working in gear with the most wear out metal motor shaft) and large geometric dimensions.

However, the aforementioned drawbacks have been saved from an electric worm-driven meat grinder.

Thus, electric meat grinders are known from the prior art, including a case, a working body with knives, knife grills, a pressure nut and a screw, an electric motor and a worm gearbox containing an output shaft of an electric motor made in the form of a worm, and a worm wheel, on the axis of which there is a shank for connecting with a meat grinder screw (RU 2070093 C1, 12/10/1996, see, for example, abstract, description, Fig. 1; CN 201070595 Y, 06/11/2008, see, for example, abstract, description, Fig. 2; CN 206435305 U, 08/25/2017, see, for example, abstract, description, Fig. 1).

The closest is an electric meat grinder, including a body, a working body with knives, knife grills, a pressure nut and a screw, an electric motor and a worm gear, containing the output shaft of the electric motor, made in the form of a worm, and a worm wheel, on the axis of which there is a shank for connecting to the screw meat grinder, while the output shaft of the electric motor is mounted in the housing using ball bearings (CN 202752079 U, 02.27.2013, see, for example, abstract, description, Fig. 1).

The disadvantages of these electric meat grinders are: low efficiency and fast overheating of the mechanism during prolonged operation at maximum load, because in the above-mentioned known electric meat grinders, the cooling of the worm gearbox is realized only due to the natural circulation of air without the use of any additional cooling elements, as well as the still existing noise level.

The technical result of the claimed technical solution is to increase efficiency, reduce overheating during prolonged operation at maximum load and reduce noise.

The specified technical result is achieved in that the electric meat grinder with a worm gear includes a housing, a working body with knives, knife grids, a pressure nut and a screw, an electric motor and a worm gear containing an output motor shaft made in the form of a worm, and a worm wheel, on the axis of which there is a shank for connecting to the screw of the meat grinder, while the output shaft of the electric motor, the worm wheel and the shank are mounted in the housing of the worm gear using ball bearings, and on the out one end of the shank and the worm has rubber sealing rings for oil cooling.

The claimed technical solution is illustrated by figure 1, which shows the structural design of the electric motor and the worm gear of an electric meat grinder.

The declared electric meat grinder with a worm gear includes a housing, a working body with knives, knife grids, a pressure nut and a screw (these elements are not shown in Fig. 1), as well as an electric motor and a worm gear. As shown in FIG. 1, the electric motor of the electric meat grinder consists of a stator 1 and rotor 2, fixed in the housing by locking screws 3. The worm gear, made in the form of a housing 7 with a cover 8, contains a sequentially located output shaft of the electric motor 4, which is made in the form of a worm and a worm wheel 5, on the axis of which there is a shank 6 for connection with the screw of an electric meat grinder. The output shaft of the electric motor (worm) 4 is attached to the housing 7 of the worm gear using a ball bearing 10, on both sides of which there are axial elastic side rings 9, and a flat washer 11 located on the output end of the worm 4. The worm wheel 5 and the shank 6 are attached to the housing 7 of the worm gear also with ball bearings 10, one of which is located in front of the worm wheel 5, and the other ball bearing 10 is located on the output end of the shank 6. On both sides of the worm wheel 5 are axial s bortkoltsa 9. Moreover, at the output end of the shank 6 and the output end of the worm 4 positioned rubber O-ring 11 for cooling the oil.

Thus, the torque from the electric motor 1 and 2 through the worm gearbox, consisting of the output shaft of the electric motor (worm) 4 and the worm wheel 5, is transmitted to the shank 6 located on the axis of the worm wheel 5, to the output end of which the meat grinder screw is connected.

Elementary calculations carried out by the method of calculating worm gears (Calculation of worm gears: Methodological instructions. MV Avakumov, AB Konovalov, St. Petersburg State Technical University of Technology and St. Petersburg, St. Petersburg, 2012) show that when using an output shaft in an electric meat grinder, an electric motor (worm) 4 with a hardness of 55 HRC, an helical worm gear and a worm wheel 5 made of carbon steel, provides high mechanical strength of the drive with a small geometric design, with a worm wheel diameter of 5 to 50 mm. In addition, the calculations by the above method allow us to state that when using rubber rubber rings 11 for oil cooling in the design of an electric meat grinder, even under the most adverse operating conditions, for example, more than 1 hour under a maximum load on the output shaft 4 of an electric motor of 300 Nm, not critical overheating of the structure occurs, i.e. the temperature will be within 95 ° C. When using a DC motor with standard characteristics, for example, idle speed of 7000 rpm. min, the maximum force on the shaft is 50 Nm, to ensure comfortable revolutions at the output of the worm gear, for example, about 180 rpm. min, a transfer coefficient of 0.025 will be required, which is practically easy to implement.

Thus, due to the above-mentioned fastenings of the output shaft of the electric motor (worm), the worm wheel and the shank to the worm gear housing using ball bearings, as well as due to the presence in the design of the worm gear of the sealing rubber rings for oil cooling located on the output ends of the shank and the worm, which allow to ensure the operation of the gearbox in the oil-filled chamber, provides increased load capacity of the worm gearbox, increased efficiency, as well as significantly noise reduction, and as a consequence, the temperature decrease after prolonged use electric meat under maximum load.

Claims (1)

An electric meat grinder with a worm gearbox, including a housing, a working body with knives, knife grills, a pressure nut and a screw, an electric motor and a worm gearbox containing an output shaft of an electric motor made in the form of a worm, and a worm wheel, on the axis of which there is a shank for connecting to the screw meat grinders, while the output shaft of the electric motor, the worm wheel and the shank are mounted in the housing of the worm gear using ball bearings, and at the output ends of the shank and the worm are located Threaded rubber rings for oil cooling.

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