DE102004014326A1 - Mixing machine for mixing mortar, flooring material or concrete comprises a securing unit to secure the filling opening of a mixing vessel - Google Patents

Abstract

Mixing machine comprises a securing unit to secure the filling opening (2a) of a mixing vessel. The securing unit is secured with a locking element (9).

Description

The Invention relates to a mixing machine for mixing mixes, in particular mortar, screed or concrete, with a mixing tank and a drive motor for a in the mixing vessel arranged mixing plant, wherein the mixing vessel an upper, especially closable Filling opening for mix having.

Such mixing machines are well known, for example from the DE 30 13 850 , As mentioned, the known mixing machines have a mixing vessel, for example, in the usual way cylindrical shape and is often located lying with its cylinder axis, wherein in the axis of the boiler driven by the drive motor shaft can be arranged on the mixing arms to the in to mix mixed material located in the mixing vessel. To be able to load mix into the mixing vessel, such a mixing vessel has a filling opening, which is usually provided by a closable pipe socket, which may extend, for example, perpendicular to the axis of the mixing vessel.

The Filling opening of a Such mixing tank is usually closable especially if it is a mixing vessel, the Is acted upon with compressed air to the mix, such as Screed to carry out by the prevailing pressure from the boiler can, to continue to process the mix.

It It is envisaged that construction workers mix through the filling hole in fill in the mixing tank, It can happen that a construction worker shakes his hand in the Mischkessel must reach into it. Such a need can e.g. result in maintenance work on the mixer, which e.g. may be formed by the shaft and the mixing arms or but when the mixing arms are through pebbles or coarser material in the mix.

One Such reaching into the mixing tank can be a significant hazard bergen, especially if the drive motor and thus the mixer is running or but even if the drive motor has been switched off and the mixer is still in a follow-up phase.

task The invention is to provide a mixing machine by means of reduces the dangers of maintenance work in the mixing tank or even be excluded.

These Task is according to the invention solved by that provided on the mixing machine a safety device is to the filling hole against to secure an intervention, especially while the mixer is running, wherein the securing device with a for the operation of the drive motor necessary key element securable and securable.

essential It is thought accordingly, the filling opening against reaching in Secure by an operator, with a release of the filling opening, making them accessible, only with a key element possible is, which is absolutely necessary is to operate the drive motor of the mixer.

hereby results in the significant advantage of the mixing machine according to the invention, that a release of the filling opening with the key element only possible is when the drive motor is off. Thus, with the inventively provided key element either only an influence on the drive motor, i. one Switching on or off are made or an influence be taken on the safety device for the purpose of a backup or a release. A simultaneous use of the key element on the drive motor and the safety device is excluded according to the invention, so that this results in a significant risk reduction.

In a particularly preferred embodiment it can be provided that the drive motor and the safety device each assigned a key element recording are, being the key element from the drive motor associated recording only when switched off Drive motor and / or the key element from the backup device associated recording only at secured filling opening removed can be.

According to the invention this means that the drive motor can only be put into operation, if the key element used in the recording of this drive motor recording and the Drive motor is turned on. In the process of switching on the drive motor may preferably automatically the key element be locked in the receptacle of the drive motor, so this while the operation of the drive motor not from the key element recording can be taken out. While Accordingly, the operation of the drive motor may be the key element not otherwise used.

If the key element is removed from the recording associated with the drive motor, this automatically causes the drive motor to be switched off so that it comes to a standstill. Only in the off position of the drive motor according to the above-mentioned preferred embodiment, the possibility to deduct the key element from the drive motor associated recording and accordingly to use the key element for further use.

These The key element is used according to the invention in securing and unlocking the safety device provided on the mixing machine. It may also be provided here that the safety device to secure the filling opening against a reaching in can only be unlocked if the key element used in the this recording device associated recording and with the key element the safety device is actuated unlocking.

at the operation, i.e. the unlocking of the securing device, whereby the filling opening of the Blender accessible can, according to the invention prefers the key element be locked so that it is in an unlocked position of the safety device can not be deducted from this associated recording. It exists accordingly according to this preferred embodiment the invention no possibility for one Operator to operate the mixing machine when the safety device is unlocked, as in this case, the same for the operation of the engine needed key element is firmly connected to the safety device.

The key element can only then from the backup device associated recording be deducted if previously secured the safety device and thus the filling opening again for a Intervention made inaccessible has been.

First After or with this backup, the key element from the receptacle withdrawn the fuse and again for the operation of the engine be used.

It is accordingly by the respective preferred locks or self-locking of the key element in the respective recording on the one hand in the operation of the engine and for in any case, when the safety device is that an operator only reach into the filling opening of the mixing vessel can when the drive motor of the mixer has been switched off.

in this connection can preferably measure the flow time of the drive motor so be that she is shorter Than the time an operator needed to get to the key element between the respective receptacles of the drive motor and the securing device place some.

As well It may be provided in a development that on the recording the security device still a device, a time lock is realized, which only after a leakage of the drive motor the recording for the key element makes it operable on the safety device or releases, so that definitely only then the safety device with the key element actuated can be when the mixer has come to a standstill.

Around the filling opening of the Mixing boiler by means of the safety device against reaching in it may be provided in a preferred embodiment of the invention be that the securing device comprises a protective screen, which is arranged in the secured state in or at the filling opening, this e.g. covers and insures against reaching in. Here, the filling opening, for example be formed by a pipe socket, which on the mixing tank is set and through which the mix is filled into the mixing vessel.

in this connection represents the use of a sieve, especially a very rough one Make sure that when the filling opening is secure and thus e.g. in the pipe socket arranged sieve still mixed material through the filling hole in the mixing tank are filled However, an operator can not pass through the screen can reach into the kettle.

Accordingly the mesh size of this protective screen is preferably selected such that this is smaller than a usual one Hand width of a person over 14 years of age or an adult, which normally performs the operation of such a machine. Such a selected mesh size However, the protective screen is suitable for mixing, even if this contains larger pebbles, happen allow. For example, the mesh size can be chosen this way; that they are maximum 70 mm.

So an operator can use a mixing vessel with secured filling opening Fill mix, this mix and then to process.

In order to realize the securing of the filling opening according to a further preferred embodiment of the invention, it may be provided that the protective screen, which is arranged for example within a pipe socket forming the filling opening on the mixing vessel, can be raised in a guide over the upper edge of the pipe socket the protective screen in the secured state above the filling opening remains and can not be swung to the side or otherwise removed.

So It may preferably be provided that for a backup a lateral Pivoting the protective screen possible is, with a pivotability, e.g. through one with the key element lockable and unlockable securing element releasable or lockable is.

In a particularly simple and for It can provide the robust construction necessary for the construction operation be that the aforementioned leadership the protective screen at the same time a pivot bearing of the protective screen forms.

constructive can the leadership e.g. be formed such that at the edge of the protective screen a pin in the direction parallel to the longitudinal axis of the pipe socket, i.e. also extends parallel to the displaceability of the protective screen, this pen being e.g. on the inner wall area of the pipe socket engages in a receptacle, which is a sliding and turning the pin in the admission permits. Therefor For example, this recording may be be realized in the form of a block attached to the inner wall of the pipe socket of the filling opening e.g. welded is and has a bore parallel to the axis of the pipe socket, wherein the bore diameter at least the diameter of the pin on Protective strainer corresponds.

By this construction of the guide the protective screen can be parallel to the longitudinal axis of the pipe socket, which defines the filling opening, moved and over the upper edge of the pipe socket to be highlighted.

According to the invention it can be provided here that the maximum displacement range the screen is defined by a stop, so that the protective screen with the guided Pen not out of the lead can be lifted out.

One such a stop can e.g. through a cross to the mentioned Pen running cotter pin be realized, or thereby that thickened the pen to its end, so this thicker end does not fit through the hole of the pin holder. In a simple manner, at the end face of the pin end a plate be welded, which has a diameter which is larger as the pin diameter.

at In these implementations, the sieve may be preferred without a prior one Release only by force and under destruction.

in the Area of the end stop, the protective screen according to a preferred embodiment only guided around the axis of the Pen around, preferably only in one direction, to be pivoted, taking the pivoting range of the screen by a securing element of the securing device according to the invention Blockable or is releasable.

Accordingly It may be provided that the side, outside and next to the pipe socket Secured element arranged within the pivoting range of the screen is, which blocks the swivel range in the secured state, in the unlocked state, however, releases. This can be done, for example take place that the safety lever is rotatably mounted, preferably wherein the lower end of the safety lever rotatably mounted is and the upper end in the secured state above the filling opening, i.e. above the upper edge of the pipe socket and in the unlocked Condition arranged below the filling opening is.

This can be done, for example, that after plugging the Key element in the inclusion of the security device a twistability of the Safety lever is released so that the safety lever through a twist out of the pivoting range of the protective screen moved out can be. In this state, as mentioned above, the key element be locked in the receptacle of the safety device.

In a particularly preferred embodiment it can be provided that at a release of the safety device and thus releasing the pivoting area of the protective screen Protective sieve can only be pivoted in such an area, so that because of the arrangement of the protective screen in an unsecured position the aforesaid safety lever which releases the pivoting area, can not be returned to its saved original position. Thus, will ensured that with out of the filler opening swiveled protective sieve the safety device not without a prior pivoting back of the protective screen over the filling opening in be transferred to the secured state can.

Genus Fine Prior art and an embodiment The invention is illustrated in the following figures. Show it:

1 a mixing vessel of a mixing machine according to the prior art

2 a plan view of the filling opening of a mixing vessel of a mixing machine according to the invention in the secured state;

3 a side view of the pipe socket of a mixing vessel of a mixing machine according to the invention in the secured state;

4 a side view of the pipe socket of a mixing vessel of a mixing machine according to the invention in the unlocked state;

5 a plan view of the filling opening of a mixing vessel of a mixing machine according to the invention in the unlocked state;

6 the single representation of a protective screen for use in the filling opening of a mixing vessel of a mixing machine according to the invention.

The 1 shows a typical mixing vessel of a mixing machine known in the art. The mixing kettle 1 is traversed in the direction of its longitudinal axis L by an unspecified wave, which is driven by a drive motor, not shown, a mixing machine also not shown. As a result, the mixing arms MA attached to the shaft are set in motion, so that mixed material, which through the filling opening 2a passing through the upper pipe socket 2 is formed into the mixing kettle 1 is filled, mixed and can be supplied to a further use.

For this purpose, not shown here and known manner, the filling opening 2a be sealed pressure-tight with a lid, so that the mixing vessel can be pressurized, for example, over air, so as to mix the mixed material from the boiler 1 herauszubefördern, as is common, for example, in the processing of screed.

The 2 and 3 show in two different views from above ( 2 ) and from the side ( 3 ) the mixing kettle 1 a mixing machine according to the invention, but not further shown, which also has a drive motor, wherein the mixing vessel has an upwardly pointing pipe socket 2 which has the filling opening 2a defined for the mix. Especially in the 2 is recognizable that the filling opening 2a through a protective sieve 3 is covered, which has such a large mesh size that, although mixed material can be filled into the mixing vessel, but a reaching in with the hand is excluded by an operator.

According to the embodiment variant shown here is the protective screen 3 by means of a pin extending at the edge downwards in the direction of the boiler 4 equipped in a designated receptacle 5 , for example, on the inner wall of the neck 2 can be welded, is guided. In this way, the sieve 3 in the direction of the double arrow 10 inside the pipe socket 2 be moved up and down, for example by hand. Here is by a at the end of the plane perpendicular to the screen level pin 4 attached plate 6 ensures that the pen 4 of the sieve 3 not out of the lead 5 can be pulled out. This plate, which has a diameter which is larger than the diameter of the bore in the receptacle 5 may be welded to the end of the pencil, for example.

In this respect, it is immediately apparent that the sieve 3 as far as it is below the upper edge of the pipe socket 2 not sideways around the pen 4 defined axis of rotation is pivotable, since it would abut the inner pipe wall in this case.

A pivoting of the screen 3 can at best be done when the sieve 3 initially over the top of the pipe socket 2 has been raised, which can be ensured by appropriate stops or Wegbegrenzungselemente that pivoting about the axis of the pin 4 only in one direction and in relation to the 2 only to the left in the direction of the other elements 7 . 8th . 9 the safety device can be done.

Referring to the 3 it can be seen that the pivoting range of the screen 3 may be blocked to the right by one of a hinge element S upstanding stop A. For swing range limitation, other measures can be taken.

With reference to the 2 and 3 is about left side next to the pipe socket 2 a safety lever 8th rotatable about an axis of rotation 8a at the lower end of the safety lever 8th arranged, wherein the pivot bearing on a base element 7 the safety device takes place. This base element can be designed as a bent sheet metal at right angles, which on the pipe socket 2 and may be welded to the mixing tank top. The basic element 7 can be an upper stop for the safety lever 8th form against which the safety lever for the purpose of automatic supply to the secured position with a spring here only symbolically represented 11 can be pulled. The feather 11 can be arranged arbitrarily in the Mechaink the safety device to a restoring force on the safety lever 8th exercise.

With reference to the 3 it is apparent that the sieve 3 can not be pivoted to the left, as the pivoting range of the screen 3 through the top of the lever 8th is blocked. A swiveling of the sieve 3 in the other direction, for example, by appropriately designed arrangement of at least one, for example, the above-described Wegbegrenzungselement A, can be achieved.

Alternatively, a Begrenzungsele ment on the pen 4 For example, it can be designed such that during a pivoting of the screen 3 in the other direction, the limiting element to the inner wall of the pipe socket 2 abuts and thereby limits the swivel range.

In the 4 and 5 is recognizable that a key element 9 in a dedicated recording 12 of the base element 7 the safety device is introduced, wherein, for example, by a rotation or even the mere insertion of the key element 9 a locking of the safety lever 8th who is in the 2 and 3 is in the secured position, is lifted, leaving the safety lever 8th around the pivot axis 8a can be tilted, resulting in tilting the upper end of the safety lever 8th lowers, so that, as in 4 shown, the swivel range of the screen 3 is released and the sieve 3 in the direction of in 5 illustrated arrow 13 can be pivoted, so that thereby the filling opening 2a is completely released.

In this case, it is provided according to the invention essential property of the securing device that previously the key element 9 must be deducted from a recording, not shown here on the drive motor, whereby the drive motor is turned off and comes to a standstill. Only in the off state, according to this embodiment, the key element 9 be deducted from the recording of the drive motor and in the recording 12 the safety device can be used. In the position according to 4 and 5 in which the safety lever 8th around the pivot axis 8a is tilted, it is no longer possible, the key element 9 from the recording 12 deducted.

According to the 5 Now an operator can eg for maintenance through the filling opening 2a in the mixing vessel 1 hineingreifen.

In order to put the motor of the mixing machine back into operation, first the sieve 3 again via the filling opening 2a be moved so that the safety lever 8th can swing back into the secured position. Only in this state can the key element 9 from the recording 12 be withdrawn to restart the engine.

The sieve 3 is then again in a position that the 2 and 3 corresponds and can according to the arrow 10 down into the pipe socket 2 be inserted so that optionally the pipe socket 2 can be completed with a pressure-tight lid, which may be posted, for example, on the illustrated hinge element S or another hinge.

With reference to the 5 It can also be seen here that with maximum pivoting of the screen shown here 3 the sieve 3 in turn, the pivoting range of the safety lever 8th blocked. It is thus ensured that with unsecured filling opening 2a there is no way to secure the safety lever 8th attributed to the secured position, without the sieve before 3 is pivoted over the filling opening. Such an additional safety measure is considered to be preferred, but does not necessarily have to be realized in the mixing machines according to the invention.

6 shows in a single view a sieve 3 , which at its edge area a pin 4 has, which is arranged perpendicular to the screen plane. With this pen 4 is the sieve 3 in the recording 5 on the inner wall of the pipe socket 2 guided and rotatable about this pin 4 stored.

In the present case has the sieve 3 in the concrete design a mesh size of 70 mm and is made of a 5 mm thick wire material. Other demensions are at the discretion of the person skilled in the art or the requirements.

Claims (9)

Mixing machine for mixing mix, in particular mortar, screed or concrete, with a mixing vessel ( 1 ) and a drive motor for a in the mixing vessel ( 1 ) arranged mixing plant, wherein the mixing vessel ( 1 ) an upper closable filling opening ( 2a ) for mix, characterized in that a securing device is provided to the filling opening ( 2a ) to prevent it from reaching in, in particular when the mixer is running, the safety device having a key element () which is necessary for the operation of the drive motor ( 9 ) is securable and Entsicherbar. Mixing machine according to claim 1, characterized in that the drive motor and the securing device are each assigned a key element receptacle, wherein the key element ( 9 ) from the drive motor associated recording only when the drive motor and / or the key element ( 9 ) from the securing device associated receptacle only with secured filling opening ( 2a ) can be removed. Mixing machine according to one of the preceding claims, characterized marked that over by the drive motor associated key element recording means of the key element the drive motor can be switched on and off. Mixing machine according to one of the preceding claims, characterized in that via the securing device associated key element recording means of the key element ( 9 ) the securing device and thus the filling opening ( 2a ) against a Hineingreifen securable and Entsicherbar. Mixing machine according to one of the preceding claims, characterized in that the securing device is a protective sieve ( 3 ), which in the secured state in or at the filling opening ( 2a ) is arranged and this secures against reaching in. Mixing machine according to claim 5, characterized in that the protective screen ( 3 ) within a filling opening ( 2a ) forming pipe socket ( 2 ) at the mixing vessel ( 1 ) and in a guided tour ( 4 . 5 ) over the upper edge of the pipe socket ( 2 ) is lifted, whereby by one with the key element ( 9 ) lockable and unlockable securing element ( 8th ) a lateral pivoting of the protective screen ( 3 ) above the pipe socket ( 2 ) is releasable or blockable. Mixing machine according to one of the preceding claims, characterized in that the guide ( 4 . 5 ) of the protective sieve ( 3 ) a pivot bearing of the protective sieve ( 3 ). Mixing machine according to claim 7, characterized in that the guide ( 4 . 5 ) through a pen ( 4 ) is formed, which at the edge of the protective screen ( 3 ) in the direction parallel to the longitudinal axis of the pipe socket ( 2 ) and at the inner wall portion of the pipe socket ( 2 ) into a recording ( 5 ), which is a sliding and turning of the pen ( 4 ) in the recording ( 5 ) allows. Mixing machine according to one of the preceding claims, characterized in that the securing element ( 8th ) by a next to the pipe socket ( 2 ) extending rotatably mounted safety lever ( 8th ) is formed, the upper end in the secured state above the filling opening ( 2a ) and in the unlocked state below the filling opening ( 2a ) is arranged.