Pneumatic beating device

Abstract

The pneumatic hammering device comprises a first end cover, a second end cover and a driving device, a second end cap; a sealing block; the main body comprises a shell and a cylinder, a first cavity is defined by the first end cover, the second end cover and the shell, the cylinder is arranged in the first cavity, and a connecting sealing position is arranged between the cylinder and the shell, so that the space between the shell and the cylinder is divided into a driving ring cavity and an energy storage ring cavity which are communicated with the first air source and the second air source respectively; the air supply pressure of the first air source is smaller than that of the second air source; a second cavity is formed in the cylinder body; at least one first through hole communicated with the driving ring cavity and at least one second through hole communicated with the energy storage ring cavity are formed in the cylinder body, and the sealing block can block the second through hole; the hammering execution piece can move in the second cavity in a reciprocating mode and can penetrate out of the first end cover; the driving mechanism can drive the sealing block to move in a reciprocating mode so as to block or unblock the second through hole. According to the pneumatic hammering device, the problem that an existing pneumatic hammer is not ideal in use effect is solved.

Description

Technical Field

[0001] This application relates to the field of pressure casting technology, and more specifically, to a pneumatic hammering device. Background Technology

[0002] In the pressure casting process, pneumatic hammering devices are used to quickly separate the sprue from the workpiece, enabling automated production, improving production efficiency, and reducing defects. Existing pneumatic hammering devices have a high hammering speed but relatively low hammering force, making it difficult to dislodge end caps due to the stickiness of the material.

[0003] Therefore, a pneumatic hammering device is needed to solve the above problems. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a pneumatic hammering device to solve the problem that the existing pneumatic hammering devices do not provide satisfactory performance.

[0005] To achieve the above objectives, this application provides a pneumatic hammering device, comprising:

[0006] First end cap;

[0007] Second end cap;

[0008] Sealing block;

[0009] The main body includes a shell and a cylindrical body. A first end cap, a second end cap, and the shell together form a first cavity. The cylindrical body is disposed within the first cavity and a connecting seal is provided between it and the shell. The connecting seal divides the space between the shell and the cylindrical body into a driving ring cavity and an energy storage ring cavity. The driving ring cavity and the energy storage ring cavity are respectively connected to a first gas source and a second gas source, and the gas supply pressure of the first gas source is less than that of the second gas source. A second cavity is disposed within the cylindrical body. The cylindrical body is provided with at least one first through hole communicating with the driving ring cavity and at least one second through hole communicating with the energy storage ring cavity. A sealing block is capable of sealing the second through hole.

[0010] A hammering actuator is capable of reciprocating within the second cavity along the axial direction of the cylinder and can pass through the first end cap.

[0011] A driving mechanism is provided, which can drive the sealing block to reciprocate to block or unblock the second through hole.

[0012] Optionally, the cylindrical body includes a first cylindrical body, a connecting cylindrical body, a second cylindrical body, and a mounting cylindrical body connected in sequence. The first through hole is provided on the first cylindrical body. The outer wall of the connecting cylindrical body and the inner wall of the shell form the sealing connection. The second through hole is provided at the connection between the second cylindrical body and the mounting cylindrical body. The mounting cylindrical body is connected to the shell, and at least one vent hole communicating with the outside is provided at the connection between the two. The sealing block reciprocates within the mounting cylindrical body.

[0013] Optionally, at least one sealing groove arranged in the circumferential direction is provided on the connecting cylinder and / or the mounting cylinder, and a sealing ring is provided in the sealing groove, the sealing ring abutting against the inner wall of the housing.

[0014] Optionally, the housing includes a first housing and a second housing connected in sequence, the diameter of the first housing is smaller than the diameter of the second housing, and the first end cap and the second end cap are respectively connected to the free ends of the first housing and the second housing; the outer wall of the connecting cylinder and the inner wall between the two ends of the first housing form the sealing connection.

[0015] Optionally, the first end cap includes a first cover plate and a guide cylinder disposed on the first cover plate. The first cover plate is detachably connected to the housing. The hammering actuator passes through the guide cylinder and can reciprocate along the guide cylinder.

[0016] Optionally, the hammering actuator includes a piston and a rod disposed on the piston. The piston reciprocates within the second cavity along the axial direction of the cylinder. The rod passes through the guide cylinder and can extend outside the guide cylinder.

[0017] Optionally, the piston is provided with a mounting groove arranged along the circumferential direction, and a buffer wear-resistant component is provided in the mounting groove.

[0018] Optionally, a buffer pad is inserted into the second cavity at the end facing the first end cap, the buffer pad is fixed to the housing, and the buffer pad is sleeved on the outside of the hammering actuator.

[0019] Optionally, the drive mechanism includes a cylinder and a movable piston capable of reciprocating along the cylinder. The cylinder is connected to the second end cover, and the movable piston passes through the second end cover and can enter the second cavity.

[0020] Alternatively, the sealing block may be fixed to the movable piston.

[0021] As can be seen from the above, the pneumatic hammering device provided in this application has the following advantages compared with the prior art: by using the above-mentioned pneumatic hammering device, the internal space of the main body is divided into a driving ring cavity and an energy storage ring cavity, which are respectively connected to the first air source and the second air source. Different air pressures are used to drive the hammering actuator to move forward and backward. The air pressure that pushes the hammering actuator forward is greater than the air pressure that pushes it backward, so that the hammering actuator has sufficient hammering force when it moves forward, and it can also effectively separate end cap-type workpieces. Attached Figure Description

[0022] The above features and technical advantages of this application will become clearer and easier to understand from the following description of its embodiments in conjunction with the accompanying drawings.

[0023] Figure 1 This is a cross-sectional view of the pneumatic hammering device used in a specific embodiment of this application.

[0024] Figure 2 for Figure 1 A schematic diagram of the cylinder of the pneumatic hammering device shown.

[0025] Figure 3 for Figure 1 A schematic diagram of the housing of the pneumatic hammering device shown.

[0026] The attached figures are labeled as follows:

[0027] 1. First end cap; 2. Housing; 3. Second end cap; 4. Cylinder; 5. Hammering actuator; 6. Buffer pad; 7. Sealing ring; 8. Wear-resistant ring; 9. Sealing block; 10. Drive mechanism. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] Figure 1 This is a cross-sectional view of the pneumatic hammering device used in a specific embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the cylinder of the pneumatic hammering device shown. Figure 3 for Figure 1 A schematic diagram of the housing of the pneumatic hammering device is shown. Figures 1 to 3 As shown, the pneumatic hammering device includes a first end cover 1, a second end cover 3, a sealing block 9, a main body, a hammering actuator 5, and a drive mechanism 10.

[0030] The first end cap 1 and the second end cap 3 are respectively connected to the opposite ends of the main body; in one embodiment of this application, the first end cap 1 is connected to the left end of the main body and the second end cap 3 is connected to the right end of the main body.

[0031] The sealing block 9 is usually set inside the main body, near the second end cap 3, and can move back and forth inside the main body to achieve the function of sealing or unsealing.

[0032] The main body includes a shell 2 and a cylinder 4. A first end cap 1, a second end cap 3, and the shell 2 enclose a first cavity, and the cylinder 4 is disposed within the first cavity. The shell 2 and the cylinder 4 are arranged inside each other, with the cylinder 4 inside and the shell 2 outside, and there is an circumferential cavity between the cylinder 4 and the shell 2.

[0033] A connecting seal is provided between the cylinder 4 and the shell 2, dividing the space between the shell 2 and the cylinder 4 into a driving ring cavity and an energy storage ring cavity. In one embodiment of this application, the cylinder 4 has a variable diameter, such that part of the outer wall of the cylinder 4 contacts the inner wall of the shell 2, forming a connecting seal. This creates a circumferential cavity between the cylinder 4 and the shell 2, dividing the space into a driving ring cavity between the connecting seal and the first end cap 1, and an energy storage ring cavity between the connecting seal and the second end cap 3. The driving ring cavity and the energy storage ring cavity are not interconnected.

[0034] The driving ring cavity and the energy storage ring cavity are respectively connected to the first gas source and the second gas source, and the gas supply pressure of the first gas source is less than that of the second gas source. A second cavity is provided inside the cylinder 4. The cylinder 4 is provided with at least one first through hole connected to the driving ring cavity and at least one second through hole connected to the energy storage ring cavity. The sealing block 9 can block the second through hole. The hammering actuator 5 divides the second cavity into a variable-volume front cavity and a rear cavity. The first through hole is provided on the side wall of the cylinder 4 corresponding to the front cavity, and the second through hole is provided on the side wall of the cylinder 4 corresponding to the rear cavity. The driving ring cavity and the energy storage ring cavity are respectively connected to the front cavity and the rear cavity. The first gas source enters the front cavity through the driving ring cavity to drive the hammering actuator 5 to move towards the second end cover 3 (moving backward), increasing the volume of the front cavity and decreasing the volume of the rear cavity. The second gas source enters the rear cavity through the energy storage ring cavity to drive the hammering actuator 5 to move towards the first end cover 1 (moving forward), increasing the volume of the rear cavity and decreasing the volume of the front cavity. Typically, the first gas source supply pressure is 0.2 MPa, and the second gas source supply pressure is 0.5 MPa.

[0035] The hammering actuator 5 can reciprocate along the axial direction of the cylinder 4 within the second cavity and can pass through the first end cover 1; when the hammering actuator 5 moves forward within the second cavity, the hammering actuator 5 extends outside the first end cover 1, and when it moves backward, the hammering actuator 5 retracts back into the first end cover 1.

[0036] The drive mechanism 10 can drive the sealing block 9 to reciprocate to block or unblock the second through hole. The drive mechanism 10 drives the sealing block 9 to move forward to block the second through hole; the drive mechanism 10 drives the sealing block 9 to move backward to unblock the second through hole.

[0037] The drive mechanism 10 drives the sealing block 9 forward to block the second through hole. The sealing block 9 forms a seal with the cylinder 4, and the energy storage ring cavity is no longer connected to the rear cavity. The gas supplied by the second gas source (gas pressure B) enters the energy storage ring cavity, where energy is stored. The gas supplied by the first gas source (gas pressure A) enters the front cavity through the drive ring cavity, pushing the hammer actuator 5 backward and entering the first end cover 1.

[0038] The drive mechanism 10 drives the sealing block 9 to move backward, thereby releasing the blockage of the second through hole and connecting the energy storage ring cavity with the rear cavity. The gas supplied by the second gas source (gas pressure B) enters the rear cavity through the energy storage ring cavity, pushing the hammering actuator 5 forward and extending it out of the first end cover 1. The extended end of the hammering actuator 5 performs a striking and hammering action.

[0039] The drive mechanism 10 drives the sealing block 9 to move back and forth, thereby causing the hammering actuator 5 to perform a reciprocating hammering action.

[0040] The above-mentioned pneumatic hammering device divides the internal space of the main body into a driving ring cavity and an energy storage ring cavity, which are respectively connected to the first air source and the second air source. Different air pressures are used to drive the hammering actuator 5 to move forward and backward. The air pressure that pushes the hammering actuator 5 forward is greater than the air pressure that pushes it backward, so that the hammering actuator 5 has sufficient hammering force when it moves forward, and can also effectively separate end cap-type workpieces.

[0041] Optionally, the cylinder 4 includes a first cylinder, a connecting cylinder, a second cylinder, and a mounting cylinder connected in sequence. A first through hole is provided on the first cylinder. The outer wall of the connecting cylinder forms a sealed connection with the inner wall of the housing 2. A second through hole is provided at the connection between the second cylinder and the mounting cylinder. The mounting cylinder is connected to the housing 2, and at least one exhaust hole communicating with the outside is provided at the connection between the two. The sealing block 9 reciprocates within the mounting cylinder. The cylinder 4 is located inside the housing 2. The first cylinder communicates with the drive ring cavity through the first through hole. The outer wall of the connecting cylinder abuts against the inner wall of the housing 2 to form a sealed connection. The second cylinder communicates with the energy storage ring cavity through the second through hole. The outer wall of the mounting cylinder abuts against the inner wall of the housing 2 to form another sealed connection. When the sealing block 9 moves within the mounting cylinder and blocks the second through hole, and the gas provided by the first gas source pushes the hammering actuator 5 to move backward, the gas in the rear cavity is discharged through the exhaust holes on the mounting cylinder and the housing 2. The aforementioned cylinder 4 can both satisfy the function of separating the interior of the shell 2 and meet the requirements of driving the hammering actuator 5.

[0042] In one embodiment of this application, the first cylinder and the second cylinder have the same diameter, both smaller than the diameter of the connecting cylinder, and all three diameters are smaller than the diameter of the mounting cylinder. The connecting cylinder is located between the first cylinder and the second cylinder, with a smooth transition between the first cylinder and the connecting cylinder, and a smooth transition between the connecting cylinder and the second cylinder. The second cylinder also has a smooth transition with the mounting cylinder.

[0043] In one embodiment of this application, there are multiple first through holes, which are evenly distributed along the circumferential direction of the first cylinder. There are also multiple second through holes, which are evenly distributed along the circumferential direction of the second cylinder. The number of first through holes exceeds the number of second through holes, and the diameter of the first through holes is smaller than the diameter of the second through holes.

[0044] Optionally, at least one sealing groove arranged circumferentially is provided on the connecting cylinder and / or the mounting cylinder, and a sealing ring 7 is provided in the sealing groove, the sealing ring 7 abutting against the inner wall of the housing 2. By adding a sealing ring 7 to the connecting cylinder, the sealing performance at the connection can be improved. By adding a sealing ring 7 to the mounting cylinder, the sealing performance at the contact point can be improved.

[0045] In one embodiment of this application, two spaced-apart sealing grooves are provided on the outside of the connecting cylinder, and a sealing ring 7 is provided in each sealing groove. The portion of the sealing ring 7 protruding from the sealing groove abuts against the inner wall of the housing 2, and the sealing ring 7 deforms to improve the sealing performance.

[0046] In one embodiment of this application, the mounting cylinder body is provided with two spaced-apart sealing grooves, each containing a sealing ring 7. The portion of the sealing ring 7 protruding from the sealing groove abuts against the inner wall of the housing 2, causing deformation of the sealing ring 7 and improving the sealing performance. An exhaust port is located between the two sealing grooves. There are multiple exhaust ports, evenly distributed along the circumferential direction of the mounting cylinder body.

[0047] Optionally, the housing 2 includes a first housing and a second housing connected in sequence. The diameter of the first housing is smaller than the diameter of the second housing. A first end cap 1 and a second end cap 3 are respectively connected to the free ends of the first housing and the second housing. The outer wall of the connecting cylinder and the inner wall between the two ends of the first housing form a sealed connection. The first housing is provided with a through hole for communicating with a first gas source, and the second housing is provided with a through hole for communicating with a second gas source. The second housing is provided with an exhaust hole, and the gas in the rear cavity is discharged through the exhaust hole on the cylinder 4 and the housing 2. The outer wall of the connecting cylinder and the inner wall in the middle of the first housing form a sealed connection, and the outer wall of the mounting cylinder and the end of the second housing form a sealed connection. Using the above-mentioned housing 2, the cylinder can be installed, and the space requirements of the energy storage ring cavity and the drive ring cavity are met.

[0048] Optionally, the first end cover 1 includes a first cover plate and a guide cylinder disposed on the first cover plate. The first cover plate is detachably connected to the housing 2. The hammering actuator 5 passes through the guide cylinder and can reciprocate along the guide cylinder. The first cover plate is detachably connected to the first housing and provides a sealing function for the housing 2. The guide cylinder is disposed in the middle of the first cover plate and provides a guiding function for the movement of the hammering actuator 5.

[0049] The second end cover 3 includes a second cover plate, which is detachably connected to the housing 2. The second cover plate is provided with a through hole, through which the driving end of the driving mechanism 10 enters the second cavity and connects with the sealing block 9.

[0050] Optionally, the hammering actuator 5 includes a piston and a rod disposed on the piston. The piston reciprocates within the second chamber along the axial direction of the cylinder 4. The rod passes through the guide cylinder and can extend outside the guide cylinder. Using the hammering actuator 5, the force applied to the piston is transmitted to the rod, which then acts externally. Under the guiding and limiting action of the guide cylinder, sufficient hammering force is ensured.

[0051] Optionally, the piston is provided with a mounting groove arranged circumferentially, and a buffer wear-resistant component is installed in the mounting groove. The buffer wear-resistant component can be a one-piece structure or a composite structure. For example, the buffer wear-resistant component includes an elastic sealing ring 7 and a wear-resistant ring 8. The elastic sealing ring 7 is fitted inside the mounting groove, and the wear-resistant ring 8 is fitted outside the elastic sealing ring 7. The piston contacts the inner wall of the cylinder 4 through the wear-resistant ring 8, which can improve the service life of the hammering actuator 5.

[0052] Optionally, a buffer pad 6 is inserted into the second cavity at the end facing the first end cap 1. The buffer pad 6 is fixed to the housing 2 and is fitted over the hammering actuator 5. The buffer pad 6 is installed on the housing 2 and the first end cap 1, and is inserted into the cylinder 4. The buffer pad 6 is fitted onto the rod, which can reciprocate relative to the buffer pad 6. When the hammering actuator 5 moves forward to its maximum displacement, the piston abuts against the buffer pad 6, and the buffer pad 6 provides a cushioning effect for the movement of the hammering actuator 5.

[0053] Optionally, the drive mechanism 10 includes a cylinder and a movable piston capable of reciprocating along the cylinder. The cylinder is connected to the second end cover 3, and the movable piston passes through the second end cover 3 and can enter the second cavity. As the movable piston advances along the cylinder, it pushes the sealing block 9 in the second cavity to block the second through hole, thus preventing communication between the energy storage ring cavity and the rear cavity. Conversely, as the movable piston retracts along the cylinder, it pulls the sealing block 9 away from the second through hole, connecting the energy storage ring cavity to the rear cavity. Using the aforementioned drive mechanism 10, the sealing block 9 can be reciprocated, thereby causing the hammering actuator 5 to perform a reciprocating hammering action.

[0054] In one embodiment of this application, the moving piston is driven by gas supplied by a gas source, such as gas pressure C, with a pressure of 0.5 MPa. A control valve can be installed on the drive mechanism 10 to open and close the gas source at preset intervals, such as venting gas for 0.5 seconds every 1 second. The control valve controls the cylinder to drive the moving piston to reciprocate, thereby driving the sealing block 9 to reciprocate.

[0055] Alternatively, the sealing block 9 can be fixed to the movable piston. Mounting the sealing block 9 on the movable piston ensures a timely response of the sealing block 9 to the drive.

[0056] The following section further describes the usage process of the pneumatic hammering device.

[0057] The pneumatic hammering device is supplied with air through three air pipes. The air source (air pressure C) supplies air to the drive mechanism 10; the first air source (air pressure A) supplies air to the front cavity through the drive ring cavity, and the second air source (air pressure B) supplies air to the rear cavity through the energy storage ring cavity; the pressures are 0.5MPa, 0.2MPa, and 0.5MPa, respectively.

[0058] Gas source (pressure C) supplies gas, driving the moving piston to move the sealing block 9 forward, thus sealing the second through hole. The sealing block 9 forms a seal with the cylinder 4, and the energy storage ring cavity is no longer connected to the rear cavity. Gas supplied by the second gas source (pressure B) enters the energy storage ring cavity, where energy is stored. At this time, gas supplied by the first gas source (pressure A) enters the front cavity through the driving ring cavity, pushing the hammer actuator 5 backward and entering the first end cover 1. Gas in the rear cavity is discharged into the external environment through the exhaust ports of the cylinder 4 and the shell 2.

[0059] When the air source (air pressure C) stops supplying air, the moving piston drives the sealing block 9 to move backward, thereby releasing the blockage of the second through hole and connecting the energy storage ring cavity with the rear cavity. The gas supplied by the second air source (air pressure B) enters the rear cavity through the energy storage ring cavity, pushing the hammering actuator 5 forward and extending it out of the first end cover 1. The extended end of the hammering actuator 5 performs a striking and hammering action.

[0060] The control valve controls the intermittent air supply from the air source, and the drive mechanism 10 drives the sealing block 9 to move back and forth, thereby causing the hammering actuator 5 to perform a reciprocating hammering action. The reciprocating hammering of the hammering actuator 5 is used to separate the casting workpiece from the sprue, and the vibration causes the casting workpiece to fall off naturally.

[0061] As can be seen from the above description and practice, the pneumatic hammering device provided in this application has the following advantages compared with the prior art: by using the above-mentioned pneumatic hammering device, the internal space of the main body is divided into a driving ring cavity and an energy storage ring cavity, which are respectively connected to the first air source and the second air source. Different air pressures are used to drive the hammering actuator to move forward and backward. The air pressure that pushes the hammering actuator forward is greater than the air pressure that pushes it backward, so that the hammering actuator has sufficient hammering force when it moves forward, and it can also effectively separate end cap-type workpieces.

[0062] Those skilled in the art should understand that the above description is merely a specific embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the scope of this application should be included within the protection scope of this application.

Claims

1. A pneumatic hammering device, characterized in that, include: First end cap; Second end cap; Sealing block; The main body includes a shell and a cylindrical body. A first end cap, a second end cap, and the shell together form a first cavity. The cylindrical body is disposed within the first cavity and a connecting seal is provided between it and the shell. The connecting seal divides the space between the shell and the cylindrical body into a driving ring cavity and an energy storage ring cavity. The driving ring cavity and the energy storage ring cavity are respectively connected to a first gas source and a second gas source, and the gas supply pressure of the first gas source is less than that of the second gas source. A second cavity is disposed within the cylindrical body. The cylindrical body is provided with at least one first through hole communicating with the driving ring cavity and at least one second through hole communicating with the energy storage ring cavity. A sealing block is capable of sealing the second through hole. A hammering actuator is capable of reciprocating within the second cavity along the axial direction of the cylinder and can pass through the first end cap. A driving mechanism is provided, which can drive the sealing block to reciprocate to block or unblock the second through hole.

2. The pneumatic hammering device according to claim 1, characterized in that: The cylindrical body includes a first cylindrical body, a connecting cylindrical body, a second cylindrical body, and a mounting cylindrical body connected in sequence. A first through hole is provided on the first cylindrical body. The outer wall of the connecting cylindrical body and the inner wall of the shell form the sealing connection. A second through hole is provided at the connection between the second cylindrical body and the mounting cylindrical body. The mounting cylindrical body is connected to the shell, and at least one vent hole communicating with the outside is provided at the connection between the two. The sealing block reciprocates within the mounting cylindrical body.

3. The pneumatic hammering device according to claim 2, characterized in that: At least one sealing groove is provided on the connecting cylinder and / or the mounting cylinder, which is arranged along the circumferential direction. A sealing ring is provided in the sealing groove, and the sealing ring abuts against the inner wall of the housing.

4. The pneumatic hammering device according to claim 3, characterized in that: The housing includes a first housing and a second housing connected in sequence. The diameter of the first housing is smaller than the diameter of the second housing. The first end cap and the second end cap are respectively connected to the free ends of the first housing and the second housing. The outer wall of the connecting cylinder and the inner wall between the two ends of the first housing form the sealing connection.

5. The pneumatic hammering device according to any one of claims 1 to 4, characterized in that: The first end cap includes a first cover plate and a guide cylinder disposed on the first cover plate. The first cover plate is detachably connected to the housing. The hammering actuator passes through the guide cylinder and can reciprocate along the guide cylinder.

6. The pneumatic hammering device according to claim 5, characterized in that: The hammering actuator includes a piston and a rod disposed on the piston. The piston reciprocates within the second cavity along the axial direction of the cylinder. The rod passes through the guide cylinder and can extend outside the guide cylinder.

7. The pneumatic hammering device according to claim 6, characterized in that: The piston is provided with mounting grooves arranged along the circumferential direction, and a buffer wear-resistant component is provided in the mounting grooves.

8. The pneumatic hammering device according to any one of claims 1 to 4, characterized in that: A buffer pad is inserted into the second cavity at the end facing the first end cap. The buffer pad is fixed to the housing and is sleeved on the outside of the hammering actuator.

9. The pneumatic hammering device according to any one of claims 1 to 4, characterized in that: The drive mechanism includes a cylinder and a movable piston that can reciprocate along the cylinder. The cylinder is connected to the second end cover, and the movable piston passes through the second end cover and can enter the second cavity.

10. The pneumatic hammering device according to claim 9, characterized in that: The sealing block is fixed to the movable piston.

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