HK1235739B - De-coring vibrator or pneumatic hammer for de-coring of foundry castings with integrated sensor - Google Patents

Description

Decoring vibrator or pneumatic hammer with integrated sensor for decoring foundry castings

Technical Field

The present invention relates to pneumatic vibrators, also known in the industry as pneumatic hammers, which are used to decoreer castings made of aluminum, steel, and ferrous alloys.

Background Art

For the purposes of this specification, the term "decoring" generally refers to the removal of sand material from a foundry casting.

Also, for the purpose of this specification, the term "casting" refers to a part/object obtained by casting metal in a suitable mold.

Patent WO2007006936 describes a decoring vibrator or pneumatic hammer.

The vibrator or hammer consists of a housing with holes for compressed air to enter and exit. Inside the housing is a mechanical assembly consisting of a cylinder in which a piston slides under the influence of compressed air. The piston contacts an impactor, which in turn strikes the casting to be decored.

The hammer includes an attachment flange that allows the hammer to be anchored to the decoring machine by fasteners such as socket head screws.

The casing of the prior art hammer is made of cast iron to ensure the required strength characteristics.

In particular in the field of high-performance decoring hammers, hammers are not known in which the casing is made of a material other than cast iron.

The housing is produced as a single cast piece.

The use of cast iron significantly increases the overall weight of the hammer and requires more milling work and therefore more labor to produce the hollow bore for accommodating the mechanical components.

The use of cast iron also presents certain limitations in terms of stress tolerance due to the stiffness of the material and the resulting poor damping of vibrations, which can be transmitted to the decoring machine associated with the hammers or vibrators.

It is also known that these hammers are used in hostile environments with very high temperatures. In such working conditions, the operator must perform his or her tasks quickly. Therefore, there is a need for a decoring hammer that can be easily connected to and removed from the decoring machine, such as the one described in patent EP1995002A2.

The solution according to the prior art proves difficult to implement, since the individual compressed air inlet and outlet circuits are arranged in different areas, thus requiring more effort to connect and disconnect the individual air circuits.

Furthermore, the hammer must operate at high temperatures and there is a risk that the mechanism generating the piston movement may be expanded when compressed air is admitted, resulting in increased friction between the components, with the result that the hammer becomes less efficient and requires periodic maintenance.

Decoring hammers require high performance in terms of applied force and piston vibration frequency in order to ensure fast and accurate decoring of metal or alloy castings.

The performance of the hammer is mainly checked by constantly monitoring the pulse frequency of the air leaving the cylinder. This type of check is cheap, but there are many uncertainties.

There are other detection methods that can monitor the vibration frequency of the striking body in the cylinder. This detection is achieved by means of sensors located on the surface of the casing. Usually, the sensors are connected to a processing circuit located outside the hammer.

The sensor is not protected and can therefore be subject to damage, for example by impact, when the hammer is removed.

There are currently no hammers in the art that include an integrated sensor protected against impact; in fact, there is no protection for such a sensor since the casing is made in one single piece and its shape is dictated by standards imposed by the manufacturers of the machines to which such hammers must be applied.

Summary of the Invention

The present invention aims to solve one or more of the above-mentioned technical problems by providing an improved de-coring vibrator or hammer, which includes a measuring circuit and a housing for protecting the measuring circuit.

One aspect of the present invention relates to a pneumatic hammer for decoring a foundry casting, the pneumatic hammer comprising:

- a casing, said casing comprising:

○Inner room;

○ an inlet circuit for compressed air intake; and

○Export circuit for compressed air discharge;

- a motion mechanism for generating a vibratory motion under the action of compressed air;

- an impactor or beater connected to the kinematic mechanism, intended to come into contact with the casting to be subjected to decoring and forming a first end of the air hammer;

- a measurement circuit for measuring the vibration frequency of the movement mechanism;

The measurement circuit comprises:

- at least one sensor for measuring the vibration frequency of the movement mechanism;

- a processing circuit enclosed in a protective housing for receiving the electrical signal delivered by the at least one sensor; and

a communication line for conducting electrical signals from the measurement circuit and/or conducting electrical signals to the measurement circuit;

The casing comprises a shell which is formed in an outer surface of the casing such that it integrates the protective housing of the measuring circuit within the outer contour of the casing itself.

BRIEF DESCRIPTION OF THE DRAWINGS

Various features and advantages of the hammer will become apparent from the following description of at least one exemplary and non-limiting embodiment of the hammer and from the accompanying drawings, in which:

1A and 1B show different views of a hammer or vibrator according to the invention; in particular, FIG. 1A shows a hammer with an associated measurement circuit, and FIG. 1B shows a side view of a decoring vibrator or hammer according to the invention;

2A and 2B illustrate the hammer or vibrator of FIG. 1 , in particular, FIG. 2A is an exploded view, and FIG. 2B is a side sectional view along a vertical plane;

FIG3 shows a side view of the housing of the hammer or vibrator of FIG2A and FIG2B ;

Figures 4A to 4D show some rear views of the housing of Figure 3; in particular, Figure 4A is a sectional view along plane 4A-4A, Figure 4A shows the connection between the outlet opening and the discharge duct; Figure 4B is a sectional view along plane 4B-4B, Figure 4B shows the discharge duct, the housing for the measuring circuit, and the measuring duct; Figure 4C is a sectional view along plane 4C-4C, Figure 4C shows the connection between the discharge duct, the discharge chamber and the channel for the communication line; Figure 4D is a view of the rear part of the housing, in which the holes for the various circuits are visible.

DETAILED DESCRIPTION

With reference to the figures listed above, the air hammer or the decoring vibrator 2 is suitable for decoring the foundry casting.

The hammer 2 comprises a housing 3 which in turn comprises an inner chamber 32 , an inlet circuit 4 for admitting compressed air and an outlet circuit 5 for discharging compressed air.

Said hammer 2 further comprises, by way of non-limiting example, a connection flange 36, by means of which the hammer 2 can be connected to a decoring machine. Preferably, said connection flange 36 is included in the casing 3 as an integral piece.

One example of an embodiment of the sleeve is shown by way of example in FIG. 3 and FIG. 4A to FIG. 4D .

The hammer 2 further includes a motion mechanism 7 for generating a reciprocating vibration motion under the action of compressed air.

In an exemplary but non-limiting embodiment, the movement mechanism is arranged so that it can move linearly between the retracted position and the working position along the axis "Z" - which is preferably the longitudinal axis of the hammer 2 itself - under the action of compressed air.

As can be seen, for example, in the exemplary embodiment in FIGS. 2A-2B , the movement mechanism 7 is arranged in the inner chamber 32 of the housing 3 .

The hammer or vibrator 2 also comprises an impactor or beater 6 connected to said movement mechanism 7 and intended to come into contact with the casting to be decored. Said impactor or beater 6 constitutes a first end of the hammer 2.

The hammer according to the invention also comprises a measuring circuit 8 for measuring the vibration frequency of the movement circuit 7 .

The measurement circuit 8 includes at least one sensor, a processing circuit encapsulated in a protective shell 84, and a communication line 82. The at least one sensor is used to measure the vibration frequency of the motion circuit 7. The processing circuit is used to receive the electrical signal transmitted by the at least one sensor. The communication line 82 is used to conduct the electrical signal from the measurement circuit 8 and/or conduct the electrical signal toward the measurement circuit 8.

The housing 3 comprises a shell 35 which is formed in the outer surface of the housing 3 in such a way that the housing 35 integrates the protective shell 84 of the measuring circuit 8 in the outer contour of the housing 35 itself.

The movement mechanism 7 is suitable for imparting a vibrating movement to the impactor or beater 6 in order to achieve an optimal decoring effect.

Said movement mechanism 7 is also suitable for moving said impactor 6 at least in a linear manner along said axis “Z”.

The hammer or vibrator 2 further comprises: at least one closing element 62 so that the movement mechanism 7 is retained in the inner chamber 32 of the housing 3; and at least one bushing 64 for maintaining the connection between the impactor or striker 6 and the movement mechanism 7.

The closing element 62 is preferably a plate that is fastened to the first end of the housing 3. The closing element 62 includes a through hole 622. In an exemplary but non-limiting embodiment, the closing element 62 includes a plurality of small holes or nozzles (not shown). The holes are suitable for directing air jets towards the impactor or beater 6. Air from a dedicated supply device flows through the holes and removes sand and dirt from the hammer, thereby preventing early degradation of the hammer. The holes or nozzles are preferably arranged around a circumference with the through hole 622 as the center. Moreover, the holes or nozzles can be shaped so as to produce an air jet that is angled relative to the axis "Z" for directing air towards the cylinder 72. The hammer 2 including the closing element as described above is particularly suitable for application in a rotary core remover.

By way of non-limiting example, the movement mechanism 7 comprises a head 71 for appropriately directing the air flow, a cylinder 72, and a striking body 73 adapted to slide within an inner cavity 722 of the cylinder 72. The movement mechanism comprises an elastic element 74, such as a coil spring.

The elastic element 74 is adapted to exert a force on the movement mechanism 7 so that the movement mechanism 7 is maintained in either a retracted position or a working position according to the action of compressed air, as is well known to those skilled in the art. The impactor or striker 6 is connected to a first end of the cylinder 72.

At the connection location, at least one bushing 64 is provided.

The cylinder 72 passes through a hole 622 included in the closing element 62. When the cylinder 72 moves along the axis "Z" to switch between the retracted position and the working position, the cylinder 72 slides in the hole 722. The shape of the hole 622 is arranged so that the hole 622 prevents any undesirable tilting of the cylinder relative to the axis "Z" of the cylinder 72 when the hammer 2 is in operation.

The head 71 at the second end of the cylinder 72 is adapted to direct a portion of the air into the inner cavity 722 of the cylinder 72 to move the striking body 73. The movement of the striking body within the cylinder 72 generates a vibratory movement of the cylinder 72. As known to those skilled in the art, the vibratory movement is transmitted to the impactor or striker 6.

As the air introduced into the interior 32 of the housing 3 for moving the movement mechanism 7 is exhausted by means of the outlet circuit 5 , the air is discharged from the interior 32 of the housing 3 through the outlet openings 51 included in the outlet circuit 5 .

The air that has entered the inner cavity 722 of the cylinder 72 flows out of the inner cavity 722 through the exhaust through-hole 724 formed in the cylinder 72 .

Since the movement mechanism 7 is well known to those skilled in the art, the movement mechanism 7 is not described in further detail herein.

In a preferred embodiment, the bushing 64 is formed of two assembleable half shells, such as shown in Figure 2 A. Furthermore, the bushing is made of a polyester fiber rubber material such as adiprene.

As mentioned above, the hammer 2 comprises a measuring circuit 8 for measuring the vibration frequency of the movement circuit 7 .

The measurement circuit 8 is integrated into the hammer 2 as a single component. In particular, it is housed in a suitable housing so that it cannot be damaged. This solution provides a more accurate measurement by measuring the vibration frequency of the kinematic mechanism while still ensuring adequate protection of the measurement device, which is associated with the hammer itself and not with the air recovery circuit as in the prior art.

Describing the construction in more detail, the casing 3 is made in a single piece, which preferably includes the connection flange 36. The casing is made by using a mold or a cold casting process.

In the hammer 2 according to the present invention, the housing 3 is made of an aluminum alloy.

The specific gravity of the aluminum alloy is higher than or equal to 2.60 kg/dm ³ (kilograms per cubic decimeter). The specific gravity of the aluminum alloy is lower than or equal to 2.85 kg/dm ³ .

This unique specific gravity range of the alloy according to the invention is much lower than the characteristic specific gravity of cast iron, which is approximately 7 kg/dm ³ and is the material used in the prior art for manufacturing the casing. This alloy reduces the total weight of the hammer 2 by approximately two thirds.

The alloy has at least 83% by weight aluminum.

The alloy has less than 98% by weight of aluminum.

Preferably, the alloy comprises at least one alkaline earth chemical element, such as magnesium.

Additionally, the alloy preferably includes a semiconductor chemical element, such as silicon.

In a preferred embodiment, silicon is used as the semiconductor material and magnesium is used as the alkaline earth element in the aluminum alloy used to produce the housing 3 according to the invention.

In one exemplary embodiment of the aluminum alloy, the percentage of silicon is comprised between 4% and 8%, and the percentage of magnesium is comprised between 0.2% and 0.8%.

The aluminum alloy used to make the casing 3 according to the present invention may include one or more metal elements, such as copper, magnesium, titanium and zinc.

The percentages of the various components can vary depending on physical properties such as the specific gravity to be achieved. By way of non-limiting example, a reduction in silicon content will reduce the specific gravity of the alloy. Conversely, adding metals to the alloy will increase the specific gravity of the alloy.

In a preferred but non-limiting embodiment, the alloy has the following composition:

between 91.87% and 93.1% aluminum;

between 6.5% and 7.5% silicon;

between 0.3% and 0.45% magnesium;

Between 0.1% and 0.18% titanium.

The specific gravity of the alloy thus obtained was 2.66 kg/dm ³ .

In an alternative embodiment, a percentage comprised between 1% and 1.5% copper is added.

In general, the hammer or vibrator 2 according to the present invention comprises a housing 3, which is preferably made of the aforementioned aluminum alloy, or can be made of cast iron, like conventional prior art housings, without departing from the scope of protection of the present invention. As mentioned above, the housing 3 comprises an inlet circuit 4 and an outlet circuit 5.

In an exemplary embodiment, the casing 3 is of generally cylindrical shape. The embodiment shown in the drawings employs, by way of example, a casing having a rhombus-shaped cross section.

The inlet circuit 4 comprises an inlet connector 41 which allows the hammer 2 to be connected to a compressed air circuit.

Said inlet connector 41 is located at a second end of the hammer 2 opposite to the end where the impactor or striker 6 is located, and at a second end of the casing 3 opposite to the end where the impactor or striker 6 is located.

Said outlet circuit 5 comprises an outlet connector 54 for connecting the hammer 2 to an air recovery circuit.

In a preferred, but non-limiting embodiment of the hammer 2 according to the invention, said outlet connector 54 is located adjacent to the inlet connector 41 at the second end of the hammer 2 .

The outlet circuit 5 comprises an outlet opening 51 formed in the cylinder 3, through which the air is discharged when the movement mechanism 7 is activated, and a discharge duct 52 extending from said outlet opening 51 upwards to the second end of the hammer 2, in particular to the second end of the housing 3. Said outlet opening 51 and discharge duct 52 are formed in the housing 3 itself, in particular in the edge of the housing 3 that delimits the inner chamber 32. Said inner chamber 32 preferably has a circular cross-section, as can be seen, for example, in Figures 2A to 2B and 4A and 4B.

In particular, the discharge duct 52 is integrated into the housing 3 in an inaccessible manner.

Preferably, the discharge duct 52 is shaped so as to at least partially surround the interior 32 of the housing 3 with respect to a plane perpendicular to its longitudinal extension, so that the discharge duct 52 serves as a cooling circuit for the housing 3 and/or for the movement mechanism 7 arranged in the interior 32 of the housing 3.

Generally, the discharge duct may be shaped to at least partially follow the curvature of the inner chamber with respect to a plane perpendicular to the longitudinal extension of the discharge duct.

In one possible embodiment, the cross section of the discharge duct 52 is shaped like a portion of a circular crown. One embodiment of the shape of the discharge duct 52 is shown in Figures 4A to 4D.

In an exemplary embodiment, the discharge conduit may have a circular or oval cross-section, or any shape that may be suitable for at least partially surrounding the inner chamber of the casing 3 .

In another embodiment (not shown), the drainage channel is a circular hole which, for example, serves only as a drainage channel, but which can nevertheless be integrated into the housing 3 .

Preferably, the outlet circuit 5 includes a first chamber 510 for placing the outlet opening 51 in fluid communication with the exhaust pipe 52 by combining the outlet opening 51 with the exhaust pipe 52. The first chamber 510 may be a closed chamber or recess formed adjacent to the outlet opening 51, such that the first chamber 510 connects the outlet opening 51 to the exhaust pipe 52. In an exemplary and non-limiting embodiment, the first chamber is a tapered pipe portion for connecting the outlet opening to the exhaust pipe.

The outlet circuit 5 further comprises a discharge chamber 53 that places the discharge pipe 52 in fluid communication with the outlet connector 54, for example, by coupling the discharge pipe 52 and the outlet connector 54 together. The discharge chamber allows the discharge pipe 52 to be connected to the outlet connector 54. In a preferred embodiment, the discharge chamber has at least one rounded portion that allows the outlet connector to be fastened to the outlet circuit 5, for example, by means of a threaded member. In an exemplary but non-limiting embodiment, the discharge chamber 53 is a tapered pipe portion that couples the discharge pipe to the outlet connector 54.

Said outlet connector 54 is preferably a separate element connected to a hole formed in the housing 3, for example by means of a screw thread.

FIG. 2B shows an exemplary embodiment of the movement mechanism 7 , wherein a person skilled in the art can intuitively see the flow of compressed air, which enters through the inlet circuit to move the hammer 2 and is discharged through the outlet circuit 5 .

As can be clearly seen, the compressed air fed into the inlet connector 41 enters the inlet chamber 42. Said inlet chamber has a variable volume depending on the movement of the movement mechanism 7 within the internal chamber 32 of the housing 3 between the retracted position and the working position.

When compressed air enters the air inlet chamber 42 , the compressed air exerts a thrust on the motion mechanism 7 , thereby switching the motion mechanism 7 from the retracted position toward the working position.

The compressed air is introduced into the inner chamber 722 of the cylinder 72 through an inlet conduit included in the head 71, thereby causing the striking body to oscillate within the cylinder 72, as is well known to those skilled in the art.

The oscillations of the movement mechanism 7 and in particular of the striking body 73 cause the air to be directed towards the outlet circuit 5 .

In particular, there is an outlet opening 51 allowing the compressed air to escape from the inner chamber 32 of the casing 3 .

The air guided by the outlet opening 51 is carried through the exhaust duct towards the air recovery circuit.

Said discharge chamber 53 is present between the outlet connector, which allows the hammer to be connected to an air recovery circuit (not shown), and the discharge duct 52 .

As mentioned above, in a preferred but non-limiting embodiment, the hammer 2 according to the invention comprises a measurement circuit 8 for measuring the vibration frequency of the movement 7 .

Said measuring circuit 8 comprises at least one sensor suitable for measuring the vibration frequency of the movement 7 .

In one possible embodiment, the measuring circuit 8 is suitable for measuring the pressure inside the inner chamber 32 of the housing 3 .

In a preferred embodiment, the measuring circuit 8 is adapted to detect the sliding movement of the striking body 73 in the cylinder 72. This measurement can be performed directly by means of a position sensor or a sliding sensor. This measurement can also be performed indirectly by means of a sensor capable of detecting the pressure changes caused by the movement of the striking body 73 in the cylinder 72. A preferred embodiment employs an extensometric sensor capable of detecting the deformation of the electrical conductor caused by the alternating air flow caused by the sliding movement of the striking body 73 in the cylinder 72. A possible embodiment of the measuring circuit 8 and of the method for obtaining the measurement data is described, for example, in Italian patent application RN2005A000024.

The measurement circuit 8 includes a processing circuit (not shown) and a communication line 82. The processing circuit is encapsulated in a protective shell 84 and is used to receive the electrical signal transmitted by the at least one sensor. The communication line 82 is used to conduct the electrical signal from the measurement circuit 8 and/or conduct the electrical signal to the measurement circuit 8.

The communication line 82 allows the measurement circuit 8 to be connected to an external control circuit (not shown), to which the acquired data can be transferred.

The hammer according to the invention comprises a channel 37 formed in the casing 3 and opening towards the second end of the hammer 2 , in particular towards the second end of said casing 3 , and in the vicinity of the inlet connector 41 .

In the exemplary but non-limiting embodiment illustrated herein, the channel 37 is generally circular in cross-section, as can be seen, for example, in Figures 4C and 4D.

Said communication line 82 can be placed in said channel 37 for keeping the entire connection of the hammer centered at the second end of the hammer. Said channel 37 is preferably incorporated in an inaccessible manner into the wall defining the interior of the housing 3 .

One embodiment of the housing 3 allows the connection for connecting the hammer to the electrical or pneumatic circuit to be centered by placing the connection at the second end of the hammer 2. Even more preferably, the connection is provided at the base of the cylindrical structure of the housing 3. Preferably, the various channels, chambers and ducts formed in the housing 3 are shaped and configured so that they can be easily obtained by turning or milling.

Furthermore, the use of an aluminum alloy allows the passages, chambers and ducts to be made in a significantly shorter time compared to the machining required from cast iron casings.

As mentioned above, the casing 3 of the hammer 2 according to the invention comprises a housing 35 formed in the outer surface of the casing 3 itself, the outer contour of which encapsulates the measuring circuit 8 , in particular the protective shell 84 .

The shape of the housing 35 is complementary to that of the outer protective shell 84 , so that the outer protective shell 84 can be accommodated in the housing 35 .

Said housing 35 has at least one fastening portion therein, which allows the measuring circuit 8 to be fastened to the hammer 2 , in particular to the casing 3 .

The measuring circuit 8 and in particular the outer protective shell 84 are fastened to the hammer by means of fasteners such as screws or bolts.

The housing 35 is formed in the cylinder 3 in a portion from which the connecting flange 36 extends.

Even more preferably, said housing 35 is formed at the initial flat portion of the connecting flange 36 where it begins to protrude from the contour of the casing 3 , as can be seen for example in FIGS. 1A , 1B , 2A , 3 and 4B .

Preferably, a channel 37 originates from the housing 35 , in which channel 37 a communication line 82 for the measuring circuit 8 can be laid.

Even more preferably, said channel 37 is located adjacent to the outer periphery of the base of the cylindrical structure of the casing 3 , in particular near the area where the flange 36 begins to protrude from the contour of the casing 3 .

Furthermore, at said housing 35 , the casing 3 comprises a measuring duct 34 , via which the measuring circuit 8 can carry out measurements in order to determine the vibration frequency of the movement 7 .

Said measuring conduit 34 is preferably a hole, more preferably a hole with a circular cross section.

As can be seen, for example, in Figure 4B, said duct 34 puts the external environment in communication with the interior 32 of the housing 3. At said measuring duct 34, said sensors of the measuring circuit 8 are arranged.

In a preferred embodiment, the sensor is positioned on the measuring pipe 34 , more preferably at a position where the channel 34 is separated from the housing 35 .

In particular, the sensor is arranged on the bottom surface of a protective shell 84 encapsulating the processing circuit, and the air jet generated by the oscillation of the striking body 73 in the cylinder 72 can act on the sensor through a suitable orifice.

As shown by way of example in FIG. 1B , FIG. 3 , the measuring duct 34 is preferably formed in a central region of the housing 35 .

The shape of the housing is complementary to the protective shell 84 of the measuring circuit 8 .

In a preferred embodiment, said housing 35 has a parallelepiped shape, said housing 35 being particularly suitable for receiving a protective shell 84 of the measuring circuit 8 which also has a parallelepiped profile.

The housing 35 is suitable for enclosing at least five sides of a protective shell 84 of the measurement circuit 8 .

The housing 35 is shaped in such a way that it can be created directly using the mould or chill used to manufacture the entire casing 3. Alternatively, the housing 35 can be machined by milling.

The hammer according to the invention allows for accelerated production of the housing, since it uses an aluminum alloy requiring little labor.

As mentioned above, in the illustrated embodiment, the casing 3 has a generally cylindrical shape with a rhombus-shaped cross section, as can be seen, for example, in Figures 4A to 4D.

The particular aluminum alloy described above provides the overall structure of the casing 3 with better stress resistance and better damping properties against undesirable vibrations.

The hammer according to the invention offers good operating characteristics due to the fact that both the pneumatic and the electrical connections are located in the rear part of the hammer, at the second end of the hammer, in particular at the second end of the casing 3 .

Since the communication line 82 , for example an electrical cable, can be connected to an extension cable by means of a connector, the measuring circuit can be installed on and removed from the hammer 2 according to the invention quickly.

Furthermore, the air outlet circuit 5 has been designed to ensure better cooling of the internal components, in particular of the movement 7 .

A particularly important aspect of the invention relates to the measuring circuit 8 and in particular to a sensor, preferably an elongation sensor, for detecting the operating frequency of the hammer 2, in particular the vibration frequency of the striking body. In the hammer 2 according to the invention, the measuring circuit 8 is arranged in a suitable housing for protecting it from shocks and preventing it from falling.

The connecting flange 36 includes a plurality of holes 361 through which fasteners, such as socket head screws, can be inserted for removably fastening the hammer to the decoring machine.

The connecting flange 36 comprises a separating element 362 for separating the fastening areas. Such a separating element 362 is also shaped to abut against the heads of fasteners such as screws and bolts conforming to ISO standards.

Due to the structure and materials of the hammer or vibrator 2 according to the invention, which are specifically designed and analyzed for the stresses involved, the hammer or vibrator 2 is very effective and robust.

Reference numerals

Decoring vibrator or hammer 2

Case 3

Inner Room 32

Measuring pipe 34

Housing (sensor) 35

Connecting flange 36

Connection hole 361

Separator 362

Channels (sensor cables) 37

Inlet circuit 4

Inlet connector 41

Intake chamber 42

Exit loop 5

Exit opening 51

Room 1, 510

Discharge pipe 52

Discharge chamber 53

Outlet connector 54

Impactor or striker 6

Closure element 62

Hole 622

Bushing 64

Movement mechanism 7

Head 71

Cylinder 72

Lumen 722

Discharge hole 724

Elastic element 74

Strike 73

Measuring circuit 8

Communication lines 82

Protective case 84

Claims (8)

1. A pneumatic hammer (2) for removing cores from sand-cast parts, The air hammer (2) includes: -Shell (3), the shell comprising: ○Inner room (32); ○Inlet circuit (4) for compressed air intake; and ○Outlet circuit for compressed air discharge (5); - Motion mechanism (7), said motion mechanism (7) is used to generate vibrational motion under the action of compressed air; - Impactor or striker (6), the impactor or striker (6) is connected to the motion mechanism (7), the impactor or striker (6) is used to contact the casting to be cored and form the first end of the air hammer; - Measurement circuit (8), the measurement circuit (8) is used to measure the vibration frequency of the motion mechanism (7); The measurement circuit (8) includes: - At least one sensor, said at least one sensor being used to measure the vibration frequency of the motion mechanism (7); - A processing circuit, enclosed in a protective housing (84), for receiving electrical signals transmitted by the at least one sensor; and - Communication line (82), the communication line (82) is used to conduct electrical signals from the measurement circuit and/or conduct electrical signals to the measurement circuit; The housing (3) includes a housing (35) formed in the outer surface of the housing (3) such that the housing (35) integrates the protective shell (84) of the measurement circuit (8) within the outer contour of the housing (35) itself. 2. The pneumatic hammer according to claim 1, wherein the housing (35) is formed in the portion of the casing (3) from which the connecting flange (36) extends. 3. The pneumatic hammer according to claim 2, wherein the housing is formed in the initial flat portion of the connecting flange (36), at which the flange (36) begins to protrude from the contour of the housing (3). 4. The air hammer according to any one of the preceding claims, wherein the housing (35) includes at least one connection portion for connecting the measuring circuit (8) to the air hammer (2). 5. The pneumatic hammer according to any one of claims 1-3, wherein the housing (3) includes a measuring conduit (34) at the housing (35), through which the measuring circuit (8) is able to perform measurements to determine the vibration frequency of the motion mechanism (7). 6. The pneumatic hammer according to any one of claims 1-3, wherein the housing (3) includes a channel (37) at the housing (35), and the communication line (82) can be laid through the channel (37). 7. The pneumatic hammer according to any one of claims 1-3, wherein the shape of the housing is complementary to the shape of the protective shell (84) of the measuring circuit (8). 8. The pneumatic hammer according to any one of claims 1-3, wherein the housing (35) is shaped to receive a parallelepiped protective shell (84), and the housing (35) is shaped to enclose at least five faces of the protective shell (84) of the measuring circuit (8).