Technical Field

The present invention relates to a concrete mixer whereby sealing is achieved by ensuring that sealing elements, namely seals, are tightened via upward motion of the flap during closing thereof by means of the eccentricity obtained in the motion of the flap through the offset that is performed in the rolling diameter of the flap.

Background of the Invention

Concrete mixers are used in order to create a mixture wherein the same feature is obtained throughout the concrete by mixing materials with different characteristics and quantities, including single shaft and twin shaft, homogeneously. Concrete mixers basically comprise a chamber wherein materials of a mixture are included and discharged from an opening, a shaft which rotates by means of a motor within the chamber, mixer arms and scrapers which enable to mix the materials by rotation of the shaft, and a flap which enables to open and close the chamber opening that is used to discharge the mixture from the chamber. In twin-shaft concrete mixers included in the state of the art, the flap closes the discharge opening of the chamber on the rotation axis of the shaft and this prevents the seal from fitting into the cover entirely. In addition, a limit switch that is used on a flap breaks down continuously today and contraction occurs in the movement of the flap as well due to the fact that the flap is driven by means of a single piston. Another problem experienced in twin-shaft concrete mixers included in the state of the art is that side pillars located on the outer body of the chamber create a bad appearance in terms of design due to the fact that they are made of spun sheet and since the pulley housing has a bolted connection structure, problem is experienced in disassembly and assembly transactions. Today, there is need for solutions which primarily enable to eliminate the sealing problem by overcoming the above-mentioned problems.

The Chinese patent document no. CN109227938, an application in the state of the art, discloses a double-horizontal concrete mixer and an anti-wear anti-leakage sealing unloading door is included in the said concrete mixer. In the said invention, it is ensured that an anti-wear leak-proof double-sealing unloading door is created in order to avoid leakage that occur in the unloading cover of the mixer. In the invention, the mixer comprises a hydraulic cylinder, a sealing strip, a door frame, a plate in order to provide sealing. The unloading door is arranged imperviously and is configured so as to rotate around an axis, upon being fixed by means of a shaft. The rubber strip located on the said unloading door plate is in contact with the perimeter of the leak-proof door and comprises a double-layer seal structure which prevents leakage of material by ensuring that the door is tightened firmly.

Summary of the Invention

An objective of the present invention is to realize a concrete mixer whereby sealing is achieved by ensuring that seals are tightened via upward motion of the flap during closing thereof by means of the eccentricity obtained in the flap through the offset that is performed in the rolling diameter of the flap.

Detailed Description of the Invention

The “Twin-Shaft Concrete Mixer” realized to fulfil the objective of the present invention is shown in the figures attached, in which:

Figure 1 is a view wherein the flap motion is shown in the inventive concrete mixer.

Figure 2 is a view of the detail A in the Figure 1. Figure 3 is a side view of the concrete mixer in the inventive concrete mixer.

Figure 4 is a bottom view of the inventive concrete mixer.

Figure 5 is a side view of the inventive concrete mixer.

Figure 6 is a general view of the housing and the connection element on the chamber in the inventive concrete mixer.

The components illustrated in the figures are individually numbered, where the numbers refer to the following:

1. Concrete mixer

2. Chamber

3. Shaft

4. Actuator

5. Flap

6. Piston

7. Retainer

8. Stopper

9. Switch

10. Bearing box

11. Housing

12. Connection element

The inventive concrete mixer (1) whereby sealing is provided between a sealing element and a flap included in a discharge opening by means of eccentricity obtained in the rotational motion of the flap, comprises: at least one chamber (2) wherein materials related to the concrete mix that is aimed to be obtained are included and which has at least one discharge opening intended for discharging the concrete mix; at least one shaft (3) which has mixer arms and scrapers in order to mi the materials included within the chamber (2); at least one actuator (4) which is included on the chamber (2) and enables to drive the shafts (3) for the rotational motion; at least one flap (5) which is used to close the discharge opening, extends along the discharge opening and enables to discharge the prepared concrete mix by opening on demand; at least two pistons (6) which are used to actuate the flap (5) and located on the chamber (2) so as to be located on both ends of the flap (5); at least two retainers (7) which are located on the chamber (2), has a centre of rotation whereby it can perform rotational motion on a flap (5) and enables the flap (5) to close the discharge opening by moving eccentrically, upon they connect to the centre of rotation from two ends of the flap (5) as offset; at least one stopper (8) which limits the motion of the flap (5) during the transaction of closing the discharge opening; and at least one mechanical switch (9) which enables to detect the position information of the flap (5).

In one preferred embodiment of the invention, the chamber (2) comprises at least one loading opening that enables to put the materials required for the concrete mix to be prepared and at least one discharge opening with an opening -that enables to discharge the prepared mixture- controlled by a flap (5). Two shafts (3) performing rotational motion by the drive they receive from the actuator (4), and the mixer arms and scrapers located at the end of the shafts (3) are included within the chamber (2). The shafts (3) are connected to the opposite walls of the chamber (2) such that they will be located in a position almost parallel to the discharge opening, and are rotated by the actuators (4) included on the walls.

The inventive concrete mixer (1) also comprises at least two bearing boxes (10) located on the side walls of the chamber (2). With the bearing boxes (10), a modern appearance is achieved by eliminating a plurality of welding transactions included in the state of the art.

The inventive concrete mixer (1) also comprises at least one housing (11) located on the chamber (2) and connection elements (12) -preferably rubber- enabling to open and close the housing (11). Since it is facilitated to open and close the housing (11) by means of the said rubber connection elements (12), easy serviceability is ensured and saving of time is achieved.

In the inventive concrete mixer (1), the actuator (4) is a motor and enables the materials included in the chamber (2) to be mixed.

In the inventive concrete mixer (1), the flap (5) closes the discharge opening extending on the lower surface of the chamber (2) in a horizontal position and enables the concrete mix included within the chamber (2) to be discharged, by opening it on demand. The flap (5) provides sealing by applying pressure to the sealing elements located around the discharge opening when it is in closed position. The flap (5) connects to two retainers (7) located on the chamber (2), as offset from the rotation axis of the retainer (7) and applies pressure to the sealing elements located around the discharge opening, via its upward motion while it closes the discharge opening. Thereby, a precise sealing is ensured due to the fact that further pressure is applied to the sealing elements compared to the prior art.

In the inventive concrete mixer (1), the piston (6) is available in two pieces and one is provided on both ends of the flap (5). Contraction problem of the flap (5), which is experienced in the prior art, is eliminated due to the fact that it is driven by means of two pistons (6).

In the inventive concrete mixer (1), the stopper (8) is an element whereby the flap (5) performs the rotational motion and it has a centre of rotation. The flaps (5) are connected to the centre of rotation of the retainer (7) as offset and thus, an eccentric motion is obtained according to the motion of the shafts (3). Further pressure is applied to the discharge opening by means of the eccentric motion and this ensures better sealing as well. (Figure 2)

In the inventive concrete mixer (1), stopper (8) is located just next to the discharge opening and limits the motion of the flap (5) during closing thereof. Since the mechanical switch (9) follows the position of the flap (5), the movement of the flap (5) is easily followed and problems of limit switch experienced in the prior art are eliminated.

In the inventive concrete mixer (1), the discharge opening is closed via more pressure through the upward motion of the flap (5) by means of the eccentricity obtained in the rolling diameter of the flap (5) by the offset motion performed in the chamber (2).

Thus, the leaking problem and the bad appearance included in the prior art are avoided.

Within these basic concepts; it is possible to develop a wide variety of embodiments of the inventive “Twin-Shaft Concrete Mixer (1)”; the invention cannot be limited to examples disclosed herein and it is essentially according to claims.