DMP

Hammer mills DMP-7,5, DMP-11, DMP-15, DMP-18, DMP-22, DMP-30 are designed for grinding of cereal grains, aristulate grains, leguminous, maize, grain mixtures, oil meal, small-piece oil cake and other types of raw materials, except mineral, at the enterprises of animal feed industry.

Hammer mills DMP-7,5, DMP-11, DMP-15, DMP-18, DMP-22, DMP-30 are designed for grinding of cereal grains, aristulate grains, leguminous, maize, grain mixtures, oil meal, small-piece oil cake and other types of raw materials, except mineral, at the enterprises of animal feed industry.


Specifications

 

 

DMP-11

DMP-7,5

1

Technical capacity *, t/h, for grain with moisture max. 15,5%, with bulk density min. 0,68 t\m3, on the screens with diameter:

                                           5 mm

                                           4 mm

                                           3 mm

 

 


1,0

0,7

0,5

 

 

 

 

0,9

0,5

0,4

 

2

Rated capacity, kW

11,0

7,5

3

Rotor speed, rpm

3000

4

Circumferential speed of hammers, m/s

75

5

Maximum length for product transportation to the cyclone, m

 

15

6

Maximum length for product suction, m

10

7

Weight, kg                                               

238


 

 

DMP-22

DMP-30

1

Technical capacity *, t/h, for grain with moisture max. 15,5%, with bulk density min. 0,68 t\m3, on the screens with diameter:

                                           6 mm

                                           5 mm

                                           4 mm

                                           3 mm

 

      

1.8

1.5

1.1

0.7

 

       

2.5

2.0

1.5

0.9

2

Rated capacity, kW

22,0

30,0

3

Rotor speed, rpm

3000

4

Circumferential speed of hammers, m/s

90

5

Maximum length for product transportation to the cyclone, m

 

15

6

Maximum length for product suction, m

10

7

Weight, kg                                              

860

* Structural and mechanical properties of grain influence the efficiency of grinding and capacity. If the specific power consumption for oat grinding is 100%, then 80% is enough for barley grinding and 57% for maize.


Increasing of moisture content reduces the capacity. With increasing of moisture content up to 20%, capacity reduces to 30%.


Length of product transportation and suction in the pneumatic transport system also influences the capacity.

 

Structure and Functioning


Hammer mill body is a welded construction in the form of a fan mounted on the frame.

  

Hammer mill drive is a serial electric motor with foot mounting, N=11 or 7,5 kW, n=3000 rpm.


Cover is made in the form of disc with rubber seals around the perimeter that ensures sealing of grinding chamber. Cover is equipped with destoner, which operation principle is based on the laws of gravity. Inlet and outlet nozzles are located at different heights to avoid the ingress of foreign objects that are differ by greater weight to the grinding chamber. Cover is putted onto the studs that bulge out from the body and pressed by handwheels.


Screen body is a welded construction designed for installation and fixing of screens and deck plates.


Hammer rotor is the main operating part of the hammer mill. It is made in a form of a fan impeller equipped with axles for hammers and hammers mounted on them. Rotor is mounted on electric motor shaft. Washers, which are installed on axles, serve to limit the movement of hammers along the axes of their suspension.


Ejecting impeller is a fan rotor mounted on shaft and designed for ejection of grinded product from the hammer mill to the cyclone.


If it is necessary to load raw materials from the floor storage heap, hammer mill is equipped with straight nozzle, when loaded from bags with loading hopper. Feeders with hammer mill are connected by Ø80 mm concertina hose.


Pneumatic transport system is designed for grain transferring to the hammer mill and grinded material transferring to cyclone-discharger. Product pipeline must be installed taking into consideration hermeticity (to avoid suction at the product input and dusting at unloading section). Possible options for pneumatic conveying steel tube Ø120 mm or concertina hose Ø100 mm.


Cyclone-discharger is designed for grinded product decelerating, its deposition to the storage container and elimination of excess pressure in the pneumatic transport system.


The filter unit with filters is designed for separation of dusty impurities.


Operation concept of the hummer mill is as follows: grain is supplied to the destoner chamber from pneumatic feeder by pneumatic transport. Coarse heavy and metallic impurities stay in the chamber, while grain is sucked into the grinding chamber, where it is grinded by hammers, spilled through the screen and ejected by the impeller through the product pipeline to the cyclone.