CN112059152A - High-frequency core-removing air hammer - Google Patents

Abstract

The invention discloses a high-frequency coring air hammer, which is provided with an outer cylinder body and an inner cylinder barrel, wherein: one end of the outer cylinder body is connected with the air inlet joint to continuously supply an air source, and the other end of the outer cylinder body is sleeved in the inner cylinder barrel; a hammer head is sleeved inside the free end of the inner cylinder barrel to impact a sand casting for core removal, a piston rod is connected between the hammer head and the airflow reversing plug, and a return spring is arranged on the outer side of the piston rod, which is close to the hammer head; the outer cylinder body is made of one of 20 steel, 25Mn, 45 steel and 27SiMn, an air hammer fixing lug is welded outside, and a connecting hole is formed in the air hammer fixing lug. The high-frequency coring air hammer has the advantages that the outer cylinder body is of a welded structure and is not limited by a casting mold any more, the high-frequency coring air hammer with various arrangement types can be economically arranged according to customer requirements, meanwhile, the return spring part of the outer cylinder body, which is positioned on the inner cylinder barrel, is connected with at least two exhaust joints, and all the exhaust joints are arranged along the same circumferential height of the outer cylinder body, so that the exhaust resistance is smaller when the high-frequency coring air hammer works.

Description

High-frequency core-removing air hammer

Technical Field

The invention relates to the technical field of gas vibrators, in particular to the technical field of core removal of casting parts.

Background

Decoring generally refers to the process of removing sand from a sand mold. The existing core removing air hammer is mainly produced abroad, and the shell is made of aluminum, silicon and magnesium alloy, so that sand removal of sand mould parts is realized, but the shell made of the aluminum, the silicon and the magnesium alloy needs to be manufactured with a mould in advance when being installed, and the shell is not easy to process after being manufactured.

Chinese patent application CN201580031035.4 discloses a decoring vibrator or air hammer with an aluminum alloy casing for decoring foundry goods, relating to an air hammer or decoring vibrator for decoring foundry goods, the hammer comprises a casing, and the casing further comprises: an inlet circuit for the inlet of compressed air into the inner chamber; and an outlet circuit for compressed air discharge. The hammer also comprises a movement mechanism for generating a vibratory movement under the action of compressed air and an impactor or striker connected to said movement mechanism; the mechanism is disposed within an interior chamber of the housing and the impactor or beater is adapted to contact a casting to be subjected to decoring. The hammer case is made of an alloy including aluminum, silicon, and magnesium.

The air hammer is also made of aluminum alloy, the shell is poor in processing performance, exhaust resistance during working is large, and the working efficiency of the whole high-frequency core-removing air hammer is relatively low.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an external cylinder body which is made of one of 20 steel, 25Mn, 45 steel and 27SiMn, an air hammer fixing lug is welded outside, a connecting hole is arranged on the air hammer fixing lug so as to connect the whole air hammer with an external using device, the external cylinder body is of a welded structure and is not limited by a casting mold, high-frequency decoring air hammers with various arrangement modes can be economically arranged according to the requirements of customers, meanwhile, the high-frequency decoring air hammer is characterized in that a return spring part of the external cylinder body, which is positioned in an internal cylinder barrel, is connected with at least two exhaust joints, and all the exhaust joints are arranged along the same circumferential height of the external cylinder body, so that the exhaust resistance is smaller when the high-frequency decoring air hammer works.

The technical scheme adopted by the invention is as follows: a high frequency decoring air hammer having an outer cylinder and an inner cylinder, wherein: the air inlet joint is connected with the air inlet joint to continuously supply an air source, the inner cylinder barrel is sleeved at the other end of the outer cylinder body, and a ventilating screw sleeve seat, a sealing cover with a central damping hole, an air flow reversing plug and a flow guide sleeve are sequentially arranged between the air inlet joint and the inner cylinder barrel so as to realize an air inlet loop and an air outlet loop of compressed air; the inner cylinder barrel is internally sleeved with a hammer head to impact a sand casting for core removal, a piston rod is connected between the hammer head and an air flow reversing plug, and a return spring is arranged on the outer side of the inner cylinder barrel, which is close to the hammer head; the outer cylinder body is made of one of 20 steel, 25Mn, 45 steel and 27SiMn, an air hammer fixing lug is welded outside, and a connecting hole is formed in the air hammer fixing lug.

Furthermore, the piston rod outside is equipped with a plurality of oil groove structures, and each oil groove structure can set up along the circumference of piston rod.

Furthermore, the return spring part of the outer cylinder body, which is positioned on the inner cylinder barrel, is connected with at least two exhaust joints, and all the exhaust joints are arranged along the same circumferential height of the outer cylinder body, so that the exhaust resistance is smaller when the high-frequency de-coring air hammer works.

Further, the number of the exhaust joints is two, when the number of the exhaust joints is two, and the exhaust diameters of the two exhaust joints are consistent, the vibration frequency of the high-frequency coring air hammer is improved by about%, and the air consumption is reduced by about%.

Further, the vent screw seat comprises: the buffer transition part is close to one end of the air inlet joint, and the seal connecting part is inserted between the sealing cover and the air flow reversing plug and between the air flow reversing plug and the outer cylinder body; the buffer transition part is externally sleeved with a buffer spring, the end part of the sealing connection part close to the buffer transition part is provided with a sealing groove, the sealing groove is filled with a piston sealing ring, and the piston sealing ring is installed in a groove of the ventilation screw sleeve seat in an embedding manner.

Furthermore, an outer cylinder body gland is sleeved at the position, located outside the hammer head, of the outer cylinder body, and a dust ring is arranged between the end part, located at the free end, of the outer cylinder body gland and the inner cylinder barrel; and meanwhile, the inner wall of one end, which is positioned on the dust ring and faces the piston rod, of the outer cylinder body gland is embedded with a wear-resisting ring, and the inner wall of the wear-resisting ring protrudes out of the inner wall of the outer cylinder body gland by a distance.

Compared with the prior art, the invention has the beneficial effects that: 1. according to the high-frequency coring air hammer, the outer cylinder body is of a welding type structure and is not limited by a casting mold any more, and the high-frequency coring air hammers in various arrangement modes can be economically arranged according to customer requirements; the material is made of one of 20#, 25Mn, 45# and 27SiMn alloy steels, has low manufacturing cost and convenient installation, and the shape structure of the outer cylinder body is not limited by a casting mold, so that the high-frequency coring air hammer which provides various arrangement modes can be economically arranged according to the requirements of customers.

2. The outer cylinder body is of a double-exhaust-port structure, so that the exhaust resistance is smaller when the high-frequency core-removing air hammer works.

3. The piston rod is provided with an oil groove structure, so that a lubricating oil film is better formed when the piston rod slides in the inner cylinder barrel, the resistance is smaller, and the vibration frequency is faster.

4. When the double exhaust port structure and the oil groove structure are implemented simultaneously, the vibration frequency of the high-frequency core-removing air hammer is improved by about 5%, and the air consumption is reduced by about 4%.

5. The piston sealing ring is changed into a groove embedding fixing mode, the sealing ring does not need to be fixed through a buffer spring, the sealing mode has no falling risk, and the use reliability of the air hammer is greatly improved.

6. The supporting ring is arranged in the outer cylinder body gland, so that the stability of a piston assembly in the cylinder body is improved when the high-frequency core removing air hammer works, the service life of the dust ring is prolonged, and the service life of the air hammer is prolonged.

Drawings

FIG. 1 is a block diagram of a cross-sectional view of a high frequency decoring air hammer;

FIG. 2 is an external contour diagram of the connection between the external cylinder body and the hammer 17, the exhaust joint 13 and the air inlet joint 1;

FIG. 3 is a view showing a connection structure of the inner cylinder 10 and the piston rod;

FIG. 4 is a block diagram of one embodiment of an external cylinder external weld air hammer retaining tab;

FIG. 5 is a block diagram of one embodiment of piston rod 11 of oil sump structure 111;

FIG. 6 is a diagram showing the state of compressed gas being transferred in the cylinder when the high-frequency core-removing air hammer is in operation; wherein:

FIG. 6-1 is a schematic view of the inlet and outlet routes of the compressed gas in the outer cylinder;

FIG. 6-2 is a schematic view showing the distribution of compressed gas paths when the compressed gas pushes the piston rod inside the cylinder from the bottom of the outer cylinder 2;

6-3 are schematic views of the compressed gas distribution during the process of the compressed gas compression piston rod impacting the sand core;

6-4 are schematic diagrams showing the flow direction distribution of compressed gas paths forming pressure difference at the airflow reversing plug instantly when the piston rod impacts the hammer head and begins to rebound;

FIG. 6-5 are schematic diagrams showing the distribution of the compressed gas paths when the compressed gas pushes the piston rod to move in the reverse direction after the position of the gas flow reversing plug is changed;

6-6 are schematic diagrams of compressed gas path distribution when the airflow reversing plug is pushed to move towards the air inlet end and is kept at the terminal position, and the compressed gas pressure source is switched to push the piston rod to move forwards to impact the hammer head;

wherein: 1-an air inlet joint, 2-an outer cylinder body and 201-an air hammer fixing lug; 3-a buffer spring, 4-a ventilation screw sleeve seat, 41-a buffer transition part, 42-a sealing connection part and 43-a sealing groove; 5-piston sealing ring, 6-static sealing ring, 7-sealing cover, 71-central damping hole; 8-airflow reversing plug, 9-flow guide sleeve, 10-inner cylinder, 11-piston rod, 111-oil groove structure; 12-return spring, 13-exhaust joint, 14-wear ring, 15-external cylinder gland, 16-dust ring, 17-hammer head, 18-protective sleeve, 19-buffer ring, 20-gland bolt, 21-gland gasket, 22-protective sleeve lock bolt, 23-protective sleeve gasket, and 24-protective sleeve nut.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples, which are only for the purpose of explaining the present invention and do not limit the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the combination or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description process of the embodiment of the present invention, the positional relationships of the devices such as "upper", "lower", "front", "rear", "left", "right", and the like in all the drawings are based on fig. 1.

As shown in fig. 1, a high-frequency decoring air hammer has an outer cylinder body 2 and an inner cylinder 10, wherein:

one end of the outer cylinder body 2 is connected with the air inlet joint 1 to continuously supply an air source, the other end of the outer cylinder body is sleeved with the inner cylinder barrel 10, and a ventilating screw sleeve seat 4, a sealing cover 7 with a central damping hole 71, an air flow reversing plug 8 and a flow guide sleeve 9 are sequentially arranged between the air inlet joint 1 and the inner cylinder barrel 10 to realize an air inlet loop and an air outlet loop of compressed air;

a hammer head 17 is sleeved in the free end of the inner cylinder 10 to impact a sand casting for core removal, a piston rod 11 is connected between the hammer head 17 and the airflow reversing plug 8, and a return spring 12 is arranged on the outer side of the inner cylinder close to the hammer head 17;

the outer cylinder body 2 is made of one of 20 steel, 25Mn, 45 steel and 27SiMn, an air hammer fixing lug 201 is welded on the outside, a connecting hole is formed in the air hammer fixing lug 201 so as to connect the whole air hammer with an external use device, the outer cylinder body 2 is of a welding type structure and is not limited by a casting mold, and high-frequency decoring air hammers with various arrangement types can be economically arranged according to customer requirements, as shown in figure 4.

In the above embodiment, as shown in fig. 5, a plurality of oil groove structures 111 are arranged outside the piston rod 11, each oil groove structure 11 may be arranged along the circumferential direction of the piston rod, or may be arranged along the moving direction of the piston rod, and the number of the oil groove structures is set to be not less than two, so that when the piston rod slides in the inner cylinder 10, a lubricating oil film is formed better, the resistance is smaller, and the frequency of the shock is faster.

As can be seen from fig. 1, 2 and 4, at least two exhaust joints 13 are connected to the part of the outer cylinder 2 of the high-frequency decoring air hammer, which is located at the return spring 12 of the inner cylinder 10, and all the exhaust joints 13 are arranged along the same circumferential height of the outer cylinder 2, so that the exhaust resistance is smaller when the high-frequency decoring air hammer works. As shown in fig. 2 and 4 in detail, when the number of the exhaust joints 13 is two and the exhaust diameters of the two exhaust joints 13 are consistent, the knocking frequency of the high-frequency decoring air hammer is improved by about 5%, and the air consumption is reduced by about 4%.

In the above embodiment, as can be seen in fig. 1 and 3, the vent nut seat 4 comprises:

a buffer transition part 41 near one end of the intake port joint 1, an

A sealing connection part 42 inserted between the sealing cover 7 and the airflow reversing plug 8 and the outer cylinder body 2; the buffer transition part 41 is externally sleeved with a buffer spring 3,

the end of the sealing connection portion 42 near the buffer transition portion 41 is provided with a sealing groove 43,

the piston sealing ring 5 is filled in the sealing groove 43 and is installed in the groove of the ventilating screw sleeve seat in an embedding mode, the sealing piece is separated from the buffer spring due to the structure, the axial acting force of the sealing piece only acts on the screw sleeve seat during working, the possibility that the sealing piece acts due to the fact that the spring is loosened does not exist, the sealing type does not have the risk of falling off, and the using reliability of the air hammer is improved. This kind of structure has solved current seal structure well: the sealing ring is fixed on the ventilating screw sleeve seat through the buffer spring and the gasket, the early-rise structure is easy to fall off, force is easily transferred to the spring when the sealing element is subjected to axial force, the spring is loosened and falls off, and therefore the sealing element fails to work and the whole device cannot work. And buffer spring's effect is when the air hammer air inlet source closes, and when whole inner assembly withdrawed cylinder body bottom under reset spring's effect, buffer spring played a cushioning effect, reduced reset spring's impact force.

In the above embodiment, the outer cylinder 2 is sleeved with the outer cylinder gland 15 at the outer position of the hammer 17, and the dust ring 16 is arranged between the end of the outer cylinder gland 15 at the free end thereof and the inner cylinder 10; meanwhile, the inner wall of the end, facing the piston rod, of the dust ring 16, of the outer cylinder body gland 15 is embedded with the wear-resisting ring 14, the inner wall of the wear-resisting ring 14 protrudes out of the inner wall of the outer cylinder body gland 15 by a distance of 0.05-0.1mm, the stability of a piston assembly inside the inner cylinder 10 is improved when the high-frequency de-coring air hammer works, the service life of the dust ring 16 is prolonged, and therefore the service life of the air hammer is prolonged as shown in fig. 3.

The invention discloses a high-frequency coring air hammer, which is structurally shown in figure 1 and mainly comprises an air inlet joint 1, an outer cylinder body 2, a buffer spring 3, a threaded sleeve seat 4, a piston sealing ring 5, a static sealing ring 6, a sealing cover 7, an airflow reversing plug 8, a flow guide sleeve 9, an inner cylinder barrel 10, a piston rod 11, a return spring 12, an exhaust joint 13, a support ring 14, an outer cylinder body gland 15, a dust ring 16, a hammer head 17, a protective sleeve 18, a buffer ring 19, a gland bolt 20, a gland gasket 21, a protective sleeve locking bolt 22, a protective sleeve gasket 23, a protective sleeve nut 24 and the like. The working process of the device during decoring is shown in figures 6-1 to 6-6, and specifically: 10A is the tail part of the cavity of the inner cylinder barrel, and 10B is the head part of the cavity of the inner cylinder barrel.

Compressed air intake impingement process, as shown in the processes of FIGS. 6-1 and 6-2:

when the air inlet pressure source is turned on, the compressed air in fig. 6-1 enters the outer cylinder 2 through the air inlet joint 1, and the piston rod assembly in the cylinder shown in fig. 3 are firstly pushed from the bottom of the outer cylinder 2, as shown in fig. 6-2 in detail; until the front hammer head 17 presses the workpiece to be cored; compressed air passes through a through hole 41 → a through hole of a sealing cover 7 → an air passage of a flow guide sleeve 9 arranged on the outer edge of the ventilating screw sleeve seat 4, and the airflow reversing plug 8 is positioned at the bottom at first, so that the compressed air passes through the airflow reversing plug 8 → the tail part of the cavity of the inner cylinder 10, and then the piston rod 11 is pushed to move forwards to impact the hammer head 17, the hammer head 17 moves towards the sand core after being impacted and collides the sand core, and the impacting action is completed, and the process is detailed as shown in fig. 6-;

when the piston rod 11 impacts the hammer 17 to rebound, the tail part of the cavity of the inner cylinder 10 is communicated with the external vent hole through the vent hole, so that the air pressure of compressed air at the tail part of the cavity of the inner cylinder 10 is instantly reduced to be close to the atmospheric pressure, a pressure difference is formed at two ends of the airflow reversing plug 8, and the compressed air pushes the airflow reversing plug 8 to move towards the front end and keep at the front end position through the central damping hole 71 of the sealing cover 7, which is shown in detail in fig. 6-4;

because of the change of the position of the airflow reversing plug 8, compressed air passes through the airflow reversing plug 8 → the switching airflow passes through the air passage in the inner cylinder 10, so that the compressed air reaches the head of the cavity of the inner cylinder 10, the piston rod 11 is pushed to move reversely, when the piston rod 11 moves reversely and exceeds the position of the exhaust hole of the inner cylinder 10, the air at the tail of the cavity of the inner cylinder 10 cannot be exhausted through the exhaust hole of the inner cylinder 10, the air in the cavity is compressed at the moment, a high-pressure chamber is formed, and differential pressure is formed on the upper end surface and the lower end surface of the airflow reversing plug 8, which;

when the airflow reversing plug 8 is pushed to move towards the air inlet end and is kept at the terminal position; the compressed air is switched to pass through the through hole of the screw sleeve seat 4 → the through hole of the sealing cover 7 → the air passage of the flow guide sleeve 9 → the air flow reversing plug 8 → the tail part of the cavity of the inner cylinder 10, so as to push the piston rod 11 to move forwards to impact the hammer 17 to start the next impact cycle, which is detailed in fig. 6-6;

periodically repeating high-frequency impact, and transmitting the high-frequency impact force of the piston rod 11 to a part needing core removal through the hammer 17, so that the sand core in the part is vibrated and broken to achieve the effect of core removal; the opening time of the air inlet pressure source is controlled through external electric control, so that the high-frequency vibration time is controlled, once the compressed air is cut off, the inside of the high-frequency air hammer is communicated with the exhaust port, the internal pressure is reduced to the atmospheric pressure, and the piston assembly inside the cylinder body shown in the figure 3 retracts to the original position under the action of the return spring 12 and returns to the initial state.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.

Claims (6)

1. A high frequency decoring air hammer having an outer cylinder (2) and an inner cylinder (10), wherein:

the air compressor comprises an outer cylinder body (2), one end of the outer cylinder body is connected with an air inlet joint (1) to continuously supply an air source, the other end of the outer cylinder body is sleeved with an inner cylinder barrel (10), and a ventilating screw sleeve seat (4), a sealing cover (7) with a central damping hole (71), an air flow reversing plug (8) and a flow guide sleeve (9) are sequentially arranged between the air inlet joint (1) and the inner cylinder barrel (10) to realize an air inlet loop and an air outlet loop of compressed air;

a hammer head (17) is sleeved in the free end of the inner cylinder (10) to impact a sand casting for core removal, a piston rod (11) is connected between the hammer head (17) and the airflow reversing plug (8), and a return spring (12) is arranged on the outer side of the inner cylinder close to the hammer head (17); the method is characterized in that:

the outer cylinder body (2) is made of one of 20 steel, 25Mn, 45 steel and 27SiMn, and an air hammer fixing lug (201) is welded outside.

2. The high-frequency decoring air hammer as set forth in claim 1, wherein: a plurality of oil groove structures (111) are arranged on the outer side of the piston rod (11).

3. A high-frequency decoring air hammer as set forth in claim 1 or 2, wherein: the part of the outer cylinder body (2) located on the return spring (12) of the inner cylinder barrel (10) is connected with at least two exhaust joints (13), and all the exhaust joints (13) are arranged along the same circumferential height of the outer cylinder body (2).

4. A high-frequency coring air hammer as set forth in claim 3, wherein: the number of the exhaust joints (13) is two.

5. The high-frequency decoring air hammer as set forth in claim 1, wherein: the vent screw sleeve seat (4) comprises:

a buffer transition (41) near one end of the air inlet joint (1), and

a sealing connection part (42) inserted between the sealing cover (7) and the airflow reversing plug (8) and the outer cylinder body (2); a buffer spring (3) is sleeved outside the buffer transition part (41);

the end part of the sealing connecting part (42) close to the buffer transition part (41) is provided with a sealing groove (43);

the sealing groove (43) is filled with a piston sealing ring (5).

6. The high-frequency decoring air hammer as set forth in claim 1, 2 or 5, wherein: an outer cylinder body gland (15) is sleeved at the outer position of the outer cylinder body (2) positioned on the hammer head (17), and a dust ring (16) is arranged between the end part of the outer cylinder body gland (15) positioned at the free end and the inner cylinder barrel (10); meanwhile, a wear-resistant ring (14) is embedded in the inner wall of one end, facing the piston rod, of the dust ring (16) of the outer cylinder body pressing cover (15), and the inner wall of the wear-resistant ring (14) protrudes out of the inner wall of the outer cylinder body pressing cover (15) by a certain distance.

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