RU215798U1 - Double Shaft Paddle Mixer - Google Patents

Abstract

The utility model relates to twin-shaft paddle mixers used in the building materials industry for preparing asphalt mixes and other similar materials. SUBSTANCE: two-shaft paddle mixer contains a housing in the form of a mixing bath, two mixing shafts with blades arranged in a helical spiral, and a drive. The mixing bath is made of two semi-cylindrical shells, welded to each other along the end walls, forming an unloading window at the bottom, closed by the rotary part of the gate, which is a cylindrical sector of the pipe, the size of which is 120˚. On the end walls of the mixing bath, support seats for the bearing housings of the mixing shafts are welded, while on one mixing shaft, a blade - a left knife is installed on the drive side, on the opposite side - a blade - a right knife, and on the other mixing shaft the blades are installed vice versa. On the left side of the mixing bath there are ribs with flanges, on which reducers are installed through flange supports, and turntables, on which electric motors are installed. The mixing bath contains a funnel fixed from above and closing it for loading the mixture components, on the inclined surfaces of which there are covers for repairing and cleaning the mixing bath with microporous rubber seals, having a length equal to the length of the mixing bath. One of the covers has a hole closed from the inside with a grate, on which an inspection hatch is mounted to control the process of mixing the mixture. The technical result of the claimed utility model is to increase productivity. 2 ill., 1 tab.

Description

The utility model relates to twin-shaft paddle mixers used in the building materials industry for preparing asphalt mixes and other similar materials.

Asphalt concrete mixer ABSM-1.5 is designed for the preparation of expanded clay concrete, asphalt concrete mixture, as well as heavy concrete mixtures of increased homogeneity with a minimum mixing time in production lines of precast concrete plants, concrete mixing plants, as well as asphalt mixing plants used in construction.

The closest analogue of the claimed utility model is a two-shaft mixer, including a mixing bath, two shafts with blades, a drive, characterized in that, in order to increase the mixing efficiency and reduce the duration of the mixing process, the blades mounted on the shafts are rotated by 45 ° relative to their axis, and on the first On the shaft, even blades are located in a helical spiral through 120 ° with the right direction of the helix, and odd blades - with the left one, even and odd blades are also located on the second shaft along similar helical spirals with left and right directions, a fixed axis is coaxially installed inside each hollow bladed shaft , on which, with a step equal to the pitch of the blades on the blade shaft, cams are installed, with the outer surface of which the rollers installed at the ends of the racks of the blades interact, and on the racks located between the inner diameter of the blade shaft and the rollers, springs are put on, the upper part of the mixing housing wa They are made along a complex line corresponding to the trajectory of the blades, due to the outer surface of the cams, the upper edge of the blade, in contact with the inner surface of the mixing bath, is made of elastic material, nozzles for supplying liquid and viscous components (RU 2622131 C1, B01F 7/04, 06/13/2017).

The disadvantage of the claimed device is that the delay blades at the end wall of the mixer, installed at the end of the shaft, create stagnation, which leads to sticking of the mixture on the end wall and the mixer body in the area of their junction, a local change in the homogeneity of the mixture and intensive wear of the delay blades.

Thus, the task of our development is to create a twin-shaft paddle mixer, in which these disadvantages are eliminated, which ensures an increase in productivity.

The technical result of the claimed utility model is to improve the quality of the resulting mixture.

The technical result of the claimed utility model is achieved by the fact that the twin-shaft paddle mixer contains a housing in the form of a mixing bath, two mixing shafts with blades arranged in a helical spiral, and a drive, the mixing bath is made of two semi-cylindrical shells welded to each other along the end walls, forming at the bottom there is an unloading window closed by the rotary part of the shutter, which is a cylindrical sector of the pipe, the value of which is 120 °, while on the end walls of the mixing bath, support sockets for the bearing housings of the mixing shafts are welded, while a blade - knife is installed on one mixing shaft from the drive side left, on the opposite side - the blade - the knife is right, and on the other mixing shaft the blades are installed vice versa, and on the left side of the mixing bath there are ribs with flanges, on which gearboxes are installed through the flange supports, and turntables on which the electric motor is installed and, at the same time, the mixing bath contains a funnel fixed on top and closing it for loading the mixture components, on the inclined surfaces of which there are covers for repairing and cleaning the mixing bath with seals made of microporous rubber, having a length equal to the length of the mixing bath, and one of the covers is made an opening closed from the inside with a grate, on which an inspection hatch is mounted to control the process of mixing the mixture.

The utility model is illustrated by drawings, where:

figure 1 shows the mixer ABSM-1,5 (double-shaft paddle mixer).

In FIG. 2 shows the mixing mechanism.

Presented in figure 1 mixer ABSM-1.5, the main technical data of which are presented in table 1, consists of a housing (1), mixing shafts (2 and 3) with installed mixing (4) and cleaning (5 and 6) blades, gearboxes (7), electric motors (8) mounted on turntables (9), chain clutch (10), pulleys (11 and 12), shutter (13), funnel (14). The chain coupling and pulleys are covered by a common casing (18). An electrical system (19) is mounted on the body, connecting the electric motors (8), limit switches (20) with the starting equipment installed in the operator's BSO. Inside the body is lined with armor plates (21).

The body (1) - the main bearing element, is a mixing bath formed by two semi-cylindrical shells welded between two end walls, and the shells do not touch from below, but form a gap closed by the rotary part of the shutter (13). On the end walls, bearing seats of the mixing shaft bearing housings (2 and 3) are welded. The nest is welded at a distance of 140 mm from the end wall of the housing by means of ribs, which are the supporting paws of the housing. On the left side of the body, flanges are welded to the ribs, on which gearboxes (7) are mounted through flange supports (24). The guard (18) is also bolted to the body. Electrical junction box (19) on the console on the drive side.

The mixing bath is closed from above with a funnel (14), to the top of which a chute is connected to load the mixture components. The funnel (14) is bolted through the seal to the body (1) of the mixer. Covers (15, 16) are mounted on the inclined surfaces of the funnel (14). Lids serve to access the inside of the mixer for its repair and cleaning, the timeliness of which ensures an increase in productivity. The lids have a length equal to the length of the mixing tub. A hole is cut out in the cover (15), tightened from the inside with a grate, an inspection hatch (17) is mounted on the hole, which serves to control the mixing process, which also increases the performance of the mixer. A limit switch (20) is mounted near each cover. When opening any of the covers, the electrical system is de-energized, which ensures the safety of work. All lids have microporous rubber seals to protect the surrounding unit from dust, thereby improving the quality of the mixture and increasing productivity.

The mixing mechanism is shown in Fig. 2. The concrete mixture is unloaded from below when the shutter (13) is opened. The shutter (13) is a 120°-cylindrical sector of the pipe, which has the ability to rotate on the semi-axes in bearings (22) fixed at the bottom on the end walls of the housing (1). Moreover, the size of the specified sector of the pipe is selected based on the guaranteed closing of the discharge window, while making a smaller size of the sector angle can lead to incomplete overlap of the discharge window and leakage of the mixture during preparation, and making a larger size will lead to high costs in its manufacture. The rotation of the cylindrical sector for the release of the finished mixture occurs under the action of a pneumatic cylinder (23) fixed on the end wall of the housing between the bearing supports of the mixing shafts. A tight fit of the shutter to the body is ensured by four knives (26) (Fig. 1) located in pairs on each side of the shutter (13) and pads (25) (Fig. 1) adjacent to the cylindrical surface of the shutter (13). The mixing mechanism is driven by electric motors (8) (Fig. 1) through V-belt drives and gearboxes (7), of the Brevini type EU - 3250 - FE. The mixing mechanism (Fig. 2) consists of two shafts (2 and 3) of square section with blades fixed on them (4, 5 and 6). The blades (4) are evenly spaced along the length of the shaft along a helix, which ensures the movement of the mixed components along the axes of the shafts. The shafts rotate with the same angular velocity towards each other, therefore the blades of the opposite shafts have the opposite slope of the blades. It is necessary to pay attention to the extreme blades: on the shaft (2) on the drive side there is a blade - a left knife (5), and on the opposite side - a blade - a right knife (6). Installing the blades (5) and (6) on the shaft (3) is reversed. The specified arrangement of the blades provides increased productivity. Shafts (2 and 3) are supported by self-aligning roller bearings mounted in bearing housings. Bearings are protected from dirt by cuffs and closed with covers. To protect the bearing from leakage of cement laitance, a rubber apron is additionally used.

At the same time, the sealing of the mixing shaft is made according to the "groin box" type. The axle box passes with some clearance through the end wall of the mixer housing, and it is filled with stuffing box packing, which is compressed by a pressure sleeve by means of two bolts. In this case, a uniform gap is formed between the sleeve, axle box and shaft sleeve. The axle box bolts are pressed against the end face of the mixer body. During operation, it is necessary to regularly monitor the condition of the seal - timely rewind the gland packing and tighten the bushing with bolts.

Planetary gearboxes (7) Brevini EC - 3250 - FE are bolted to the housing frame through flange supports (24) (Fig. 1). Maintenance of gearboxes is carried out in accordance with the attached instructions for their operation. Adjustment of tightening of the roller taper bearings of the reducer is carried out by central adjusting bolts located in the bearing caps on the outer side of the reducer. The bearings of the drive shaft-gear are adjusted by a bolt located on the inside of the gearbox facing the mixer body. After adjustment, the bolts are locked with locknuts.

In tables 1 and 2, for a comparative example, the characteristics of the claimed mixer ABSM-1.5 and the mixer BP-2G-375 are given, based on which it can be seen that the claimed two-shaft paddle mixer has a larger loading volume and greater power, due to which it allows from a larger filler to receive a high-quality mixture and solves the problem of increasing productivity.

Thus, the above essential features complement each other and are in a causal relationship with the claimed technical result, which consists in improving the quality of the mixture.

Double Shaft Paddle Mixer

Table 1

The name of indicators ABSM-1.5 Values
(nominal) Loading volume, l
The volume of the finished batch, l
Number of cycles per hour, not less
Mixing time, s, no more
Aggregate size, mm, no more
Frequency of rotation of mixing shafts, min. ^-1
Installed electric motor power, kW
Working pressure in the pneumatic cylinder, MPa (kgf/cm ² )
Overall dimensions, mm
length
width
height
Weight, kg 2250
1500
50
42
70
34.43
2×30
0.4…0.6(4…6)
2720
2020
1843
4140

Double Shaft Paddle Mixer

table 2

The name of indicators BP-2G-375 Values (nominal) Loading volume, l
The volume of the finished batch, l
Number of cycles per hour, not less
Mixing time, s, no more
Aggregate size, mm, no more
Frequency of rotation of mixing shafts, min. ^-1
Installed electric motor power, kW
Working pressure in the pneumatic cylinder, MPa (kgf/cm ² )
Overall dimensions, mm
length
width
height
Weight, kg 375
250
50
30-60
40
36
7.5
No
1715
1750
1945
1800

Claims (1)

A two-shaft paddle mixer, containing a housing in the form of a mixing bath, two mixing shafts with blades arranged in a helical spiral, and a drive, characterized in that the mixing bath is made of two semi-cylindrical shells welded to each other along the end walls, forming an unloading window at the bottom, closed by the rotary part of the gate, which is a cylindrical sector of the pipe, the size of which is 120˚, while on the end walls of the mixing bath, support sockets for bearing housings of the mixing shafts are welded, while on one mixing shaft, on the drive side, a blade is installed - a knife left, with the opposite sides - the blade - the knife is right, and on the other mixing shaft the blades are installed vice versa, and on the left side of the mixing bath there are ribs with flanges, on which gearboxes are installed through flange supports, and turntables on which electric motors are installed, while the mixing bath contains closed a funnel attached from above and closing it for loading the components of the mixture, on the inclined surfaces of which there are covers for repairing and cleaning the mixing bath with seals made of microporous rubber, having a length equal to the length of the mixing bath, and in one of the covers there is a hole closed from the inside by a grate, on which has an inspection hatch to control the process of mixing the mixture.

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