FI63536C - APPARAT FOER AKTIVERING AV CEMENT - Google Patents

Description

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JjB A () UTLÄGGNINGSSKRIFT O 3 5 3 6 C Patent granted 11 07 1983 ^ Patent eeddelat 3 3 B 28 C 7/02, C CW- B 7/52, 7/56, (51) Kv.ft.Va. B 0? B 13 / 00t b 02 c 23./"/36 ENGLISH —Fl N LAN D (21) PMMttllnk «m-PMiMm« Mn | 801269 (22) HtkamltpUvI - AMeknlngadig 21.θΠ.80 ^ * (23) Altuipllvl— GlItlfhMadaf 21.0H.80 (41) Tullut JulklMktl - ftttvtc ofNntHg 15.02.8l

Patent and Registration Office ............. , . ,, _ ^ '. (44) Date of issue and date of issue. -

Patent · oen registerstyrelsen An * ekan uttagd och uti.akrifcan puUicand 31.03.83 (32) (33) (31) Pyydetty «» elltau »—Begird priorKet lU.o8.79 USSR (SU) 2808251 (71) Territorialnoe Geologicheskoe Upravlenie Tsentralnykh Raionov, 2 Roschinskaya ulitsa 10, Moscow, Severo-Zapadnoe Territorialnoe Geologicheskoe Upravlenie, Ulitsa Gertsena 59, Leningrad, USSR (SU) (72) Viktor Filippovich Rogov, Moscow, Igor Grigorievich Nikiforov,

Moscow, Ruben Armenovich Tatevosian, Moscow, Mikhail Yakovlevich Titov, Moscow, Nikolai Konstantinovich Lipatov, Apatity Murmansk Oblast, USSR (SU) (7Π) Oy Kolster Ab (5Π) Cement activator - Apparat för aktivering av cement

The invention relates to devices for performing mechanical and physical activation of a mixture of cement or other binder and aggregate, and can be used on construction and drilling sites, long-term storage sites, and elsewhere where cement and other binders are stored and used.

Due to the climatic conditions in Siberia and the Arctic, it is necessary to store the supplied raw materials on site. Even under favorable conditions, long-term storage leads to the strengthening of the cement and the loss of its activity. The properties of cement deteriorate greatly when stored for a long time under unfavorable conditions, especially in autumn and winter, because the cement hydrates, clumps, the cement mortar setting time increases, the viscosity increases, the strength properties of the cement stone deteriorate and the cement is not suitable for well injection.

A variety of devices have now been developed to improve the activity of binders prior to their use, and these are based on mechanical activation using various mills, hydrocyclones, turbines, and vibration, electromagnetic, ultrasonic, and the like arrangements.

One known device for activating cement (see U.S. Patent No. 3,987,697) includes a single electromagnetic particle size comminution device with a common comminution hopper at the inlet that ensures the cement is fed by its own weight to the comminuter. The device also includes a series of devices, e.g. a receiving hopper and a crusher, a transfer screw in the housing, a screw end classifier comprising a flat screen with frames housed in the housing, a collection hopper having an inlet in communication with the classifier housing and an outlet in communication with the comminution hopper. The screw and classifier of the device have their own traction devices and a common control device so as to ensure a continuous flow of cement from the receiving hopper to the outlet of the electromagnetic shredder. The electromagnetic shredder of the device has a working chamber made of non-magnetic material and closed with a sieve at the outlet side for retaining workpieces made of magnetized, magnetically hard balls, such as barium hexaffer balls. The working chamber of the chopper is surrounded by an electromagnetic coil which receives current from the AC network, and the electromagnetic field of the coil causes the magnetized workpieces to move chaotically to reduce, rub and agitate the cement particles. The combination of the mechanical and magnetic action of a device previously known in the art contributes to a more complete restoration of the active properties of the cement.

The device is designed to operate under the same conditions in the production plant for the production of either cement or ready-mixed concrete products, as the use of several different actuators, non-activating devices and additional transfer devices and passive intermediate devices make the structure complex and cumbersome. and on drilling sites where cement is used directly. In addition, in order to ensure the continuous and even transport of the cement through all the lines of the device, a device is needed to give an additional mechanical effect to all the passive intermediate devices - funnels - which also makes the device complicated.

63536

The operation of a known activating device for cement is complicated because it requires constant monitoring to coordinate the productions of different arrangements. For example, when the physical-mechanical properties of the starting cement change, the functions of the receiving hopper, the crusher and the classifier on the outlet side of the screw are not compatible. Especially if the moisture content of the starting cement increases, the production of the crusher also increases and the production of the classifier decreases.

In this known device, the cement does not flow uniformly through the electromagnetic shredder due to the fact that there is no automatic cement height control device at this inlet hopper. The uneven flow of cement through the working chamber affects the degree of activation of the cement in the electromagnetic crusher, shortens the life of the crusher and in some cases leads to its interruption.

U.S. Pat. No. 3,630,457 and DE Application No. 2,829,272 also disclose systems according to the application which combine units of different functions into a single general technological line in which all units are automatically synchronized according to a certain parameter such as yield quantity or quality, fineness of ground product, etc. They do not present structural technical solutions according to the present invention.

U.S. Patent No. 2,592,934 discloses a cylindrical device having a helical or scraping coaxial working member that can rotate relative to the body. Compared to the present invention, the known device has e.g. the following differences: The screen of the classifier according to the invention is an active member which rotates and through which the working member, i.e. a fixed screw, rubs the material to be treated. Thus, the substance to be treated first enters the cylindrical body, where it is rubbed, after which it comes out.

In the device according to said US patent publication, a fixed cylindrical screen is used to remove the substance from the outside of the drum. Because the strainer is fixed and does not co-operate with the screw on the rotating working member, the substance clogs the sieve because the substance is not forced through the sieve. In the device according to the invention, the screen drum rotates with respect to a fixed screw, whereby the entire surface of the screen is in direct cooperation with the side of the screw. The substance is then subjected to a centrifugal force which pushes the substance through a sieve. In addition, said known device 4 63536 does not have a second screw rotating with a sieve, which would provide a sufficient push of the substance into the working chamber and ensure its transfer therein.

It is an object of the invention to provide a portable cement activating device that can be moved for use in locations where cement is used immediately, such as construction and drilling sites.

It is a further object of the invention to provide a device with a simpler structure by minimizing the number of additional and intermediate devices.

It is a further object of the invention to provide a device which ensures the smooth and continuous transport of cement through all lines.

Another object of the invention is to simplify the operation of the device in connection with the changing physical-mechanical properties of the starting cement.

Finally, it is an object of the invention to ensure a uniform flow of cement into the particle size through the working chamber of the electromagnetic comminuter.

The cement activating device according to the invention comprises at least one particle size electromagnetic shredder with a common shredding hopper on the inlet side, which ensures the supply of cement with its own weight to the shredder, and a series of mechanisms including a receiving hopper with a crusher and a conveyor screw with a classifier. is made as a rotating screen which forms a rotating body and is rigidly fixed to the axis of the conveying screw coaxially with it, the screen having a working member made as a screw rigidly fixed inside the hopper.

The cement activating device according to the invention is characterized in that the classifier is arranged together with the screw and the housing part inside the grinding funnel on the upstream side of the inlet of the electromagnetic shredder.

The screw and housing preferably extend inside the chopper through the opening in its inclined bottom wall, and the device has a tube that communicates between the hoppers and the interior and extends into the chopper upstream of the opening through which the screw and housing extend. The tubes are preferably vertically adjustable to change its vertical position above the sloping bottom wall of the chopping funnel.

The structure of the device according to the invention has been made much simpler because it has as few auxiliary and intermediate devices as possible, which improves portability and simplifies operation and ensures smooth and continuous transport of cement in all lines of the device and especially through the working chamber of the electromagnetic shredder.

The invention will now be described with reference to the accompanying drawing, which shows certain embodiments of the invention, in which: Fig. 1 shows a perspective view of a cement activating device according to the invention, with the crusher and the funnel shown partly in cross section and electromagnetic chopper in the same section; Fig. 2 shows a longitudinal section of a cement activating device according to the invention, in which the electromagnetic shredder is arranged in a different way with respect to the shredding hopper; Fig. 3 shows a perspective view, partly in cross-section, of an embodiment of a chopper funnel according to the invention and its position in relation to the chopper; Fig. 4 shows a perspective view of an embodiment of a grinding funnel according to the invention and an arrangement of a plurality of grinders; Fig. 5 is a front elevational view of another embodiment of a comminution funnel according to the invention and the relative arrangement of the conveying screw in the housing, the electromagnetic shredders and their funnel; Fig. 6 shows a plan view of the embodiment shown in Fig. 5? Fig. 7 shows a plan view of another relative arrangement of a transport screw, an electromagnetic shredder and a shredding hopper in a housing according to the invention? and Figure 8 shows a longitudinal section of a cement activating device according to the invention with a pipe.

The cement activating device is mounted on a base 1 (Fig. 1), which includes a crushing chamber 2 with a crusher 3 placed in the bottom part of a receiving hopper 4 provided with a retaining screen 5. The crushing chamber 2 communicates via the channel 6 with the interior of the housing 7 of the conveying screw 63536. The housing 7 of the screw 8 is a tube.

The classifier 9 placed on the outlet side of the screw 8 comprises a fixed screw 10 and a screen 11 made in the form of a rotating body. The drawing shows a cylindrical screen 11. The screen 11 is rigidly attached to the shaft of the transport screw 8 coaxially with it. The screen 11 together with the screw 8 and the part of the housing 7 is placed inside the chopping funnel 12. The hopper 12 has vertical walls 13 and a sloping bottom wall 14 with an opening 15 through which the screw 8 and the housing 7 extend into the interior of the hopper 12 and which is sealed. The bottom of the hopper 12 has an opening 16 through which the interior of the hopper 12 communicates with the working chamber 17 of one electromagnetic finisher 18.

An opening 15 through which the screw 8 and the housing 7 extend is made in an inclined bottom wall 14 on the upstream side of the inlet (opening 16) of the working chamber 17 of the grinder 18 and workpieces 19 in the form of magnetically hardened magnets such as barium hexferritite are placed in the working chamber 18. 17 is surrounded by electromagnetic windings 20 and is closed on the outlet side by a screen 21 which holds the workpieces 19 inside the chamber 17. The electromagnetic windings 20 are powered by an AC network.

The crusher 3, the transport screw 8 and the classifier 9 have a common drive device 22 which is connected to these devices by a mechanical transmission 23.

According to Figure 2, the shredder funnel 12 has a special shape and has a coaxial position of the shredder 18 relative to the housing 7 of the screw 8 and the shredder windings 20 surround the screw 8 and the housing 7 and receive current from the AC network via a voltage regulator 24.

Figure 3 shows in more detail the relative arrangement of the bottom wall 14 of the hopper 12 and the chamber 17 and windings 20 of the grinder 18.

Here, the chopping funnel 12 is conical at the base. According to Figure 4, the bottom wall 14 of the hopper 12 may consist of a plurality, e.g. four cones, connected by a wall 13 forming four interconnected half-cylinders. This shape of the bottom wall 14 of the hopper 12 provides a plurality (four) of choppers 18 on the outlet side, the outlet openings of which are connected by a common manifold. The conical portions of the bottom wall 14 of the hopper 12 are arranged 7 63536 symmetrically with respect to each other and to the geometric longitudinal axis of the screw.

Figures 5 and 6 show a shape in which the bottom wall 14 of the funnel 12 forms two cones which are also arranged symmetrically with respect to each other and to the geometric longitudinal axis of the screw 8. This embodiment makes it possible to connect the separate outlet pipes of the shredders 18 horizontally and vertically to a common manifold.

According to Figure 7, the two cones of the bottom wall 14 of the hopper 12 can also be placed asymmetrically with respect to the geometric longitudinal axis of the screw 8.

The cement activating device shown in Fig. 8 is provided with a pipe 25 which establishes a connection between the interior of the receiving hopper 4 and the grinding hopper 12. One end of the tube 25 extends inside the comminution hopper 12 through an opening 26 upstream of the opening 15 through which the screw 8 and housing 7 extend and upstream of the inlet of the receiving hopper 4, and the other end of the tube extends through the cover plate 27 of the receiving hopper 4. . According to the drawing, the tube 25 may be vertically adjustable to change its vertical position above the inclined bottom wall 14 of the chopping funnel 12. This is ensured by the telescopic structure of the tube 25, which consists of a fixed lower tube 28, a movable upper tube 29 and a locking ring 30.

The cement activator works as follows. The cement to be activated is fed to the hopper 4 (Fig. 1) in lumps whose size is not larger than the loop size of the sieve 5 of the hopper 4. The cement lumps passing through the screen 5 go into the crushing chamber 2 in the area of influence of the crusher 3. After crushing, the cement enters the channel 6 and the housing 7 of the transport screw 8, which feeds the substance upwards into the classifier 9, whereby abrasion and reduction take place at the same time. Cement particles, the size of which is not larger than the loop size of the cylindrical screen 11, pass through it and go to the comminution hopper 12, which ensures the supply of cement with its own weight along the inclined bottom wall 14 of the hopper 12 and through the opening 16 into the working chamber 17 of the electromagnetic shredder then the activated cement is fed to the outside of the device through a screen 21.

635 36

All rotating mechanisms - the crusher 3, the transport screw 8 and the screen 11 of the classifier 9 - are driven by the drive 22 via a mechanical transmission device 23. The operation of the chopper 18 takes place under the electromagnetic action of the windings 20 (Fig. 2), which are supplied with current from the alternating current network via a voltage regulator 24, so that the quality of the processing of the cement can be controlled.

The transport screw 8 and the mechanical transmission device 23 transmit the vibrations to the walls of the hoppers 4 and 12, which greatly facilitates the passage of cement through these devices, so that no additional vibrators are required. Maintaining a constant layer of cement in the hopper 12 in front of the opening 16 preferably affects the quality of cement activation and the continuity of operation of the device.

Since the production of the crusher 3, the conveying screw 8 and the classifier 11 (Fig. 1) significantly exceeds the production of the electromagnetic crusher 18, the cement can accumulate and solidify in the hopper 12, causing the device to interrupt as the supply of material to the electromagnetic crusher working chamber 17 is interrupted.

Using the pipe 25 (Fig. 8) connecting the hoppers 4 and 12, the thickness of the cement layer above the opening 16 is determined at the height of the upper end of the pipe 25 above the sloping bottom wall 14 of the hopper 12. Thanks to the telescopic structure of the pipe 25, the thickness of the cement layer above the opening 16 can be adjusted.

If it is necessary to mix the powdered substances simultaneously with the activation, several receiving hoppers 4 can be used, which are connected to the common transport screw 8 via channels 6. The ingredients of the mixture meet at the screw Alamut and mix. Stirring also continues while the substances are lifted along the screw 8 in the housing 7 and the classifier 9 as well as in the electromagnetic shredder 18.

The device according to the invention is most preferably used to activate a hardened cement which has lost some of its physical-mechanical properties.

Claims (3)

63536 9 A cement activating device comprising at least one particle size electromagnetic shredder (18) having a common shredding hopper (12) on the inlet side which ensures the supply of cement by its own weight to the shredder (18) and a set of mechanisms comprising a receiving hopper (4) having a crusher (3), and a conveying screw (8) in the housing (7), having a classifier (9) made as a rotating screen (11) forming a rotating body and rigidly attached to the axis of the conveying screw (3) coaxially therewith, wherein the screen (11) has a working member (10) made as a screw rigidly fixed inside the hopper (12), characterized in that the classifier (9) is arranged together with the screw (8) and a part of the housing (7) inside the chopping funnel (12) upstream of the inlet of the electromagnetic shredder (18). Device according to claim 1, characterized in that the screw (8) and the housing (7) extend inside the chopping funnel (12) through an opening (15) in its inclined bottom wall (14), and the device has a tube (25) connecting the hoppers (4 and 12) between the interiors and extends into the chopping funnel (12) on the upstream side of the opening (15) through which the screw (8) and the housing (7) extend. Device according to claim 2, characterized in that the tube (25) is vertically adjustable to change its vertical position above the inclined bottom wall (14) of the chopping funnel (12).