Eccentric hammer tamping device for sand casting

Abstract

The invention relates to the technical field of tamping, in particular to an eccentric hammer tamping device for sand casting, which comprises a connecting steel frame and two tamping rods for tamping, and further comprises a positioning frame which is arranged on one side of the connecting steel frame and is used for guiding the two tamping rods, one side of each tamping rod is fixedly connected with a power storage wheel, and the other side of each tamping rod is fixedly connected with an eccentric hammer. A limiting groove matched with the power storage wheel is formed in the positioning frame, an exhaust pipe is fixedly connected to the bottom of the positioning frame, a gas transmission assembly matched with the power storage wheel to operate is arranged in the positioning frame, and a tamping assembly for driving the power storage wheel to move is arranged on one side of the connecting steel frame; and the flow dividing cavity is formed in the positioning frame, a sliding block for driving the air conveying assembly to run is arranged in the flow dividing cavity, and a flow dividing assembly for changing the running path of the air conveying assembly is arranged on one side of the sliding block. Air flow generated by air injection can disturb particles in the sand mold in advance, original static friction balance of the sand mold is damaged, and the tamping effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tamping, in particular to an eccentric hammer tamping device for sand casting. Background Art

[0002] As an ancient and widely used metal forming process, sand casting still occupies an important position in modern industry. This process completes the production of parts by pouring liquid metal into a pre-made sand mold, taking out the casting after the metal cools and solidifies. Sand casting is widely used in many fields such as automobiles, aerospace, and machinery manufacturing due to its advantages such as high production flexibility, wide application, wide source of materials, and low cost. However, in the sand casting process, the quality of sand mold production directly affects the final quality of the casting. The sand mold needs to have good compactness, air permeability and strength to ensure that the liquid metal can smoothly fill the mold cavity and maintain a stable shape during the cooling process. Traditional sand mold making methods often rely on manual or simple mechanical compaction, which have problems such as uneven compaction, low efficiency, and high labor intensity.

[0003] For example, the patent document with the prior art announcement number CN215467937U relates to the technical field of tamping devices, and in particular to a tamping machine for sand casting, including a tamping hammer and an external mounting box, the inner top wall of the external mounting box is connected to a limit rod, the limit rod is movably sleeved with a receiving rod, the lower end of the receiving rod movably penetrates the bottom wall of the external mounting box and is connected to the tamping hammer, the interior of the external mounting box is provided with a driving mechanism that drives the tamping hammer to move upward periodically through the receiving rod, the positioning rod is inserted into the interior of the mounting hole, and the position of the tamping hammer is fixed by the receiving rod, at this time the first spring is stretched, and the position of the tamping hammer is fixed to prevent the tamping hammer from moving downward under the action of gravity and affecting the operation of the material below; when the positioning rod is inserted into the interior of the mounting hole, the positioning rod squeezes the movable plate, the first copper contact piece and the second copper contact piece are in contact, the display light is powered on and emits a bright light, reminding the operator to turn off the drive motor in time.

[0004] Although the currently used rammer technology can exert considerable impact force by direct contact, its rigid mode of action inevitably exposes inherent defects when processing complex sand molds. When dealing with deep cavities, thin-walled structures, or specific scenarios that require high compactness, the mechanical impact force will be significantly affected by the damping effect of the material during transmission inside the sand mold. This effect makes it difficult for the raw sand in the sand mold to break the existing static friction equilibrium state. Relying solely on the impact force exerted by the rammer, it is impossible to continuously and effectively change the positional relationship between the raw sands, and thus it is difficult to meet the actual needs of complex sand mold processing. To this end, the present application proposes an eccentric hammer tamping device for sand casting. Summary of the invention

[0005] The purpose of the present invention is to provide an eccentric hammer ramming device for sand casting to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An eccentric hammer ramming device for sand casting, including a connecting steel frame and two ramming rods for ramming, further including: A positioning frame, which is arranged on one side of the connecting steel frame and is used to guide the two ramming rods. A power storage wheel is fixedly connected to one side of each of the two ramming rods. A limiting groove adapted to the power storage wheel is opened inside the positioning frame. An exhaust pipe is fixedly connected to the bottom of the positioning frame. An air delivery component that operates in cooperation with the power storage wheel is arranged inside the positioning frame. A ramming component for driving the power storage wheel to move is arranged on one side of the connecting steel frame; A flow dividing cavity, which is opened inside the positioning frame. A slider for driving the air delivery component to operate is arranged inside the flow dividing cavity, and a flow dividing component for changing the operation path of the air delivery component is arranged on one side of the slider.

[0007] Preferably, the air delivery component includes a centrifugal fan blade arranged inside the positioning frame. A rotating handle is rotatably connected inside the positioning frame. The outer surface of the rotating handle is connected to the centrifugal fan blade through an inertia wheel. A top handle is slidably connected inside the positioning frame, and the top handle can be in contact with the power storage wheel. One end of the top handle is fixedly connected to a straight groove plate, and one end of the rotating handle is placed inside the straight groove plate.

[0008] Preferably, the flow dividing component includes a crank rotatably connected to the outer surface of the slider, and a hinge block is rotatably connected to one side of the flow dividing cavity. The crank is rotatably connected to the hinge block. A flow dividing piece is fixedly connected inside the positioning frame. The hinge block is used to block the flow dividing cavity. The top of the slider is in contact with the straight groove plate.

[0009] Preferably, a pressing piece is rotatably connected inside the flow dividing cavity, and the power storage wheel can be in contact with the pressing piece. An arc-shaped plate is fixedly connected to the outer surface of the pressing piece, and the arc-shaped plate can be in contact with the bottom of the slider. One end of the arc-shaped plate is rotatably connected to a pushing handle. A discharge port communicating with the flow dividing cavity is opened inside the positioning frame, and a plug rod rotatably connected to the pushing handle is arranged inside the discharge port.

[0010] Preferably, an air cavity is jointly opened inside the power storage wheel and the ramming rod. A vertical pipe communicating with the outside is opened at the bottom of the air cavity, and a vertical pipe communicating with the outside is opened on the outer surface of the air cavity.

[0011] Preferably, a piston piece adapted to it is slidably connected inside the air cavity, and the piston piece is located between multiple vertical pipes and multiple side pipes. A tension spring fixedly connected to the air cavity is fixedly connected to the bottom of the piston piece. A counterweight ball is fixedly connected to the inside of the piston piece.

[0012] Preferably, a driving cylinder is fixedly connected to the top of the connecting steel frame, an output end of the driving cylinder extends to the top of the positioning frame for fixed connection, a limiting plate is fixedly connected to the top of the ramming rod, and the limiting plate is used to limit the ramming rod from falling off.

[0013] Preferably, the tamping assembly includes a bearing seat fixedly connected to one side of the connecting steel frame, and a rotating rod is rotatably connected to the inside of the bearing seat, and two centrifugal hammers are alternately arranged on the outer surface of the rotating rod, and the two centrifugal hammers respectively contact with two power storage wheels.

[0014] Preferably, an auxiliary support plate is fixedly connected to one side of the connecting steel frame, a driving motor is fixedly connected to the top of the auxiliary support plate, a driving wheel is fixedly connected to the output end of the driving motor, one end of the rotating rod is fixedly connected to a driven wheel connected to a driving wheel belt, and one end of the connecting steel frame is fixedly connected to a protective shell mounted on the outer surfaces of the driving wheel and the driven wheel.

[0015] Preferably, a solution soft shell is fixedly connected to the bottom of the diverter sheet, a discharge port is provided at the bottom of the solution soft shell, and the solution soft shell is made of rubber material and contains alcohol.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The two tamping rods are in periodic contact with the centrifugal hammers through the power storage wheel, forming high-frequency alternating strikes. When the driving motor drives the rotating rod to rotate, the centrifugal hammers lift the power storage wheels on both sides in turn. The tamping rods hammer the mold under the action of gravity, achieving multiple impacts per second, significantly improving the fitting efficiency of the original sand and the mold. When the centrifugal hammer rotates, its arc-shaped motion trajectory converts the rotational kinetic energy of the rotating rod into the gravitational potential energy of the tamping rod, and the vertical movement of the power storage wheel is constrained by the limit groove to ensure that the tamping direction is always perpendicular to the mold surface, improving the compaction uniformity. When the rod moves up, the power storage wheel contacts the top handle and drives the straight groove plate to move up. The rotating handle rotates unidirectionally under the action of the inclined surface of the straight groove plate, and the centrifugal fan blades are driven to rotate continuously through the inertia wheel. After the external air is drawn into the positioning frame, a directional airflow parallel to the mold surface is formed through the exhaust pipe. The airflow generated by the jet can disturb the internal particles of the sand mold in advance and destroy its original static friction balance. The driving cylinder can drive the positioning frame to move up and down. When the tamping rod hits the mold, the positioning frame continues to move down, so that the exhaust pipe is close to the mold surface, shortening the airflow path and improving the heat dissipation efficiency. The limit groove constrains the vertical movement of the power storage wheel to ensure the precise tamping direction. The compression spring drives the top handle to reset, and the inclined design of the straight groove plate realizes the one-way rotation and rapid reset of the handle.

[0017] 2. The slider disposed inside the diversion cavity and the diversion component on one side can flexibly change the operation path of the gas transmission component according to the working state of the device, achieving efficient gas diversion. This design enables the gas to be distributed to different working areas as needed, improving the gas utilization efficiency and pertinence, ensuring that each working link obtains sufficient and appropriate air flow support. The top of the slider abuts against the straight groove plate. During the operation of the device, the movement of the slider can assist in driving the movement of the straight groove plate, thereby enabling the continuous operation of the gas transmission component. This avoids the instability of the ramming process caused by the intermittent operation of the gas transmission component, provides a stable and continuous air flow supply for the entire ramming process, and ensures the consistency of the ramming effect. When the gas enters the inside of the air cavity and the rammer rams the mold, the gas is discharged through the vertical pipe, forming an air cushion layer on the contact surface between the hammer rod and the sand mold. This air cushion layer effectively reduces the friction and wear between the hammer rod and the sand mold, extends the service life of the hammer rod, and at the same time reduces the impact of the heat generated by friction on the quality of the sand mold and the casting. The discharged gas can accelerate the particle movement of the green sand around the hammer head, forming a more concentrated shock wave. This shock wave helps the green sand particles better fill the mold cavity, improving the density and surface quality of the casting. At the same time, the high-pressure air flow can blow away the adhering green sand on the surface of the hammer head, keeping the hammer head clean and further improving the ramming effect. When the positioning frame is adjusted so that the energy storage wheel is located at the center position of the limit groove, the rammer rams, causing the counterweight ball to move quickly downward under the action of inertia, driving the piston piece to move, and discharging the gas through the side pipe to sweep the mold and the green sand horizontally. The parallel air flow is evenly distributed along the surface of the mold and acts synergistically with the hammering impact direction, enabling the particles to more easily undergo horizontal sliding and interlayer shear movement under the combined action of the impact force, gravity, and air flow drag force, breaking through the static friction threshold, achieving more efficient position rearrangement and pore filling, and thus improving the overall density of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the present invention with the protective shell removed; Figure 3 is a structural schematic diagram of the present invention with the auxiliary support plate removed; Figure 4 is a sectional structural schematic diagram of the positioning frame of the present invention; Figure 5 is a sectional structural schematic diagram of the rammer of the present invention; Figure 6 of the present invention Figure 5 is an enlarged schematic diagram of the structure at A; Figure 7 is a sectional structural schematic diagram of the positioning frame of the present invention; Figure 8 of the present invention Figure 7 is an enlarged schematic diagram of the structure at B; Figure 9Schematic structural diagram of the centrifugal fan blade in the present invention; Figure 10 Schematic structural diagram of the vertical pipe in the present invention; Figure 11 Schematic cross-sectional structural diagram of the vertical pipe in the present invention.

[0019] In the figure: 100, connecting steel frame; 101, driving motor; 102, auxiliary support plate; 103, protective shell; 104, driving wheel; 105, driven wheel; 106, bearing seat; 107, rotating rod; 108, centrifugal hammer piece; 109, ramming rod; 110, energy storage wheel; 111, limiting piece; 200, positioning frame; 201, driving cylinder; 202, limiting groove; 203, centrifugal fan blade; 204, rotating handle; 205, inertial wheel; 206, straight groove plate; 207, top handle; 208, compression spring; 209, exhaust pipe; 300, shunt cavity; 301, pressing piece; 302, arc-shaped plate; 303, pushing handle; 304, drain port; 305, plug rod; 306, slider; 307, hinge block; 308, crank; 309, shunt piece; 310, solution soft shell; 311, discharge port; 400, vertical pipe; 401, side pipe; 402, piston piece; 403, counterweight ball; 404, tension spring; 405, air cavity. Specific implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1: Please refer to Figure 1 , Figure 4 and Figure 5 , the present invention provides a technical solution: an eccentric hammer ramming device for sand casting, including a connecting steel frame 100 and two ramming rods 109 for ramming, and further including a positioning frame 200 which is arranged on one side of the connecting steel frame 100 and used to guide the two ramming rods 109. Energy storage wheels 110 are fixedly connected to one side of each of the two ramming rods 109. A limiting groove 202 adapted to the energy storage wheels 110 is formed inside the positioning frame 200. An exhaust pipe 209 is fixedly connected to the bottom of the positioning frame 200. An air delivery component that operates in cooperation with the energy storage wheels 110 is arranged inside the positioning frame 200. By setting the ramming rod 109 to hammer the mold and the green sand, the fit degree between the green sand and the mold can be effectively improved, thereby improving the casting efficiency. By setting the air delivery component, the mold and the green sand can be effectively cooled, and the airflow generated by jetting can disturb the particles inside the sand mold in advance, making the particles easier to rearrange during subsequent hammering, and improving the compaction uniformity.

[0022] See also Figure 5 , Figure 7 as well as Figure 9 Further, the gas delivery assembly includes a centrifugal blade 203 arranged inside the positioning frame 200, the positioning frame 200 is internally rotatably connected with a handle 204, the outer surface of the handle 204 is connected to the centrifugal blade 203 through an inertia wheel 205, the positioning frame 200 is internally slidably connected with a top handle 207, and the top handle 207 can contact the power storage wheel 110, one end of the top handle 207 is fixedly connected with a straight groove plate 206, and one end of the handle 204 is placed inside the straight groove plate 206, and a compression spring 208 is provided for driving the top handle 207 is reset, and the inertia wheel 205 can be driven to rotate by setting the cooperation between the straight groove plate 206 and the rotating handle 204, thereby continuously driving the centrifugal blades 203 to rotate, so that the external gas is drawn into the interior of the positioning frame 200 and discharged through the exhaust pipe 209, forming an airflow to blow toward the mold and the raw sand to complete the heat dissipation, wherein the straight groove plate 206 can drive the rotating handle 204 to rotate unidirectionally and drive the inertia wheel 205 to rotate continuously, and by setting the inertia wheel 205, it is effective to continuously store power for the centrifugal blades 203 and increase its rotation speed.

[0023] Among them, a driving cylinder 201 is fixedly connected to the top of the connecting steel frame 100, and the output end of the driving cylinder 201 extends to the top of the positioning frame 200 for fixed connection. The top of the ramming rod 109 is fixedly connected with a limiting plate 111, and the limiting plate 111 is used to limit the falling off of the ramming rod 109. By setting the driving cylinder 201, the positioning frame 200 can be driven to move downward continuously. At this time, the ramming rod 109 is restricted in the interior of the positioning frame 200 and will contact the mold under the driving force of the positioning frame 200. After the ramming rod 109 contacts the mold, the continuous downward movement of the positioning frame 200 will make the exhaust pipe 209 close to the mold, and the power storage wheel 110 will contact the top handle 207 after being driven upward to achieve the heat dissipation function.

[0024] See also Figure 1 , Figure 2 as well as Figure 3, Further, a tamping component for driving the storage wheel 110 to move is arranged on one side of the connecting steel frame 100. The tamping component includes a bearing seat 106 fixedly connected to one side of the connecting steel frame 100, and a rotating rod 107 is rotatably connected inside the bearing seat 106. Two centrifugal hammer pieces 108 are arranged staggeredly on the outer surface of the rotating rod 107, and the two centrifugal hammer pieces 108 are respectively in contact with the two storage wheels 110. An auxiliary support plate 102 is fixedly connected to one side of the connecting steel frame 100, a driving motor 101 is fixedly connected to the top of the auxiliary support plate 102, a driving wheel 104 is fixedly connected to the output end of the driving motor 101, and a driven wheel 105 belt-connected to the driving wheel 104 is fixedly connected to one end of the rotating rod 107. A protective shell 103 sleeved on the outer surfaces of the driving wheel 104 and the driven wheel 105 is fixedly connected to one end of the connecting steel frame 100. By arranging the two ramming rods 109 staggeredly, the two storage wheels 110 can be staggered and contacted, so that the two ramming rods 109 alternately ram the mold, realizing high-frequency ramming work.

[0025] Specifically, by installing the connecting steel frame 100 above the sand mold, driving the driving motor 101 to operate to drive the driving wheel 104 to rotate, which drives the driven wheel 105 to rotate through the belt, so that the rotating rod 107 rotates, and the centrifugal hammer piece 108 continuously contacts the storage wheel 110 to raise the height of the ramming rod 109 to store energy for it. When the centrifugal hammer piece 108 is separated from the storage wheel 110, the ramming rod 109 will be affected by gravity and hammer the mold. The driving cylinder 201 is opened to adjust the position of the positioning frame 200. By driving the positioning frame 200 to move downward, the storage wheel 110 is placed at a high position in the limiting groove 202, so that when the storage wheel 110 moves upward, it contacts the top handle 207 and compresses the compression spring 208. As the top handle 207 moves upward, it will drive the straight groove plate 206 to move upward, thereby driving the rotating handle 204 to rotate, and then driving the centrifugal fan blade 203 to rotate through the inertia wheel 205. Subsequently, the straight groove plate 206 resets to drive the rotating handle 204 to reset. Under the action of the inertia wheel 205, the centrifugal fan blade 203 will continue to rotate, so as to introduce external gas into the positioning frame 200 and then discharge it through the exhaust pipe 209 and blow it to the mold to dissipate heat.

[0026] In summary, the two tamping rods 109 form high-frequency alternating strikes through the periodic contact between the power storage wheel 110 and the centrifugal hammer 108. When the driving motor 101 drives the rotating rod 107 to rotate, the centrifugal hammer 108 lifts the power storage wheels 110 on both sides in turn, and the tamping rod 109 hammers the mold under the action of gravity, achieving multiple impacts per second, significantly improving the fitting efficiency between the raw sand and the mold. When the centrifugal hammer 108 rotates, its arc-shaped motion trajectory converts the rotational kinetic energy of the rotating rod into the gravitational potential energy of the tamping rod, and the vertical movement of the power storage wheel 110 is constrained by the limit groove 202 to ensure that the tamping direction is always perpendicular to the mold surface, improving the compaction uniformity. When the rod 109 moves up, the power storage wheel 110 contacts the top handle 207, driving the straight groove plate 206 to move up. The handle 204 rotates unidirectionally under the action of the inclined surface of the straight groove plate 206, and the centrifugal blades 203 are driven to rotate continuously through the inertia wheel 205. After the external air is drawn into the positioning frame 200, a directional airflow parallel to the mold surface is formed through the exhaust pipe 209. The airflow generated by the jet can disturb the internal particles of the sand mold in advance and destroy its original static friction balance. The driving cylinder 201 can drive the positioning frame 200 to move up and down. When the tamping rod 109 hits the mold, the positioning frame 200 continues to move downward, so that the exhaust pipe 209 is close to the mold surface, shortening the airflow path and improving the heat dissipation efficiency. The limiting groove 202 constrains the vertical movement of the power storage wheel 110 to ensure the accuracy of the tamping direction. The compression spring 208 drives the top handle 207 to reset, and cooperates with the inclined surface design of the straight groove plate 206 to achieve unidirectional rotation and rapid reset of the handle 204.

[0027] Example 2: Please refer to Figure 5 , Figure 6 as well as Figure 7 The present invention also provides a technical solution, which is different from the technical solution of the first embodiment: an eccentric hammer tamping device for sand casting, further comprising a diversion chamber 300, which is opened inside the positioning frame 200, and a slider 306 for driving the gas transmission component to run is arranged inside the diversion chamber 300, and a diversion component for changing the running path of the gas transmission component is arranged on one side of the slider 306, the diversion component comprises a crank 308 rotatably connected to the outer surface of the slider 306, and a hinge block 307 is rotatably connected to one side of the diversion chamber 300, the crank 308 is rotatably connected to the hinge block 307, the positioning frame 200 is fixedly connected with a diversion plate 309, the hinge block 307 is used to block the diversion chamber 300, the top of the slider 306 is in conflict with the straight groove plate 206, and the gas generated by the gas transmission component can be effectively diverted by setting the diversion component, and the straight groove plate 206 can be assisted by setting the slider 306 to move, so that the gas transmission component can continue to run.

[0028] See also Figure 7 , Figure 8 as well as Figure 10, Further, a pressing piece 301 is rotatably connected inside the flow dividing cavity 300, and the energy storage wheel 110 can abut against the pressing piece 301. An arc-shaped piece plate 302 is fixedly connected to the outer surface of the pressing piece 301, and the arc-shaped piece plate 302 can abut against the bottom of the slider 306. One end of the arc-shaped piece plate 302 is rotatably connected to a pushing handle 303. A drain port 304 communicating with the flow dividing cavity 300 is formed inside the positioning frame 200. A plug rod 305 rotatably connected to the pushing handle 303 is arranged inside the drain port 304. A solution soft shell 310 is fixedly connected to the bottom of the flow dividing piece 309. A drain port 311 is formed at the bottom of the solution soft shell 310. The solution soft shell 310 is made of rubber material and stores alcohol inside. By adjusting the position of the positioning frame 200, when the energy storage wheel 110 compacts, it abuts against the pressing piece 301, so that the arc-shaped piece plate 302 drives the slider 306 to move. At this time, the hinge block 307 opens to introduce gas into the interior of the flow dividing cavity 300. At the same time, the pushing handle 303 pushes the plug rod 305 to move, so that the gas is discharged through the drain port 304 and enters the interior of the air cavity 405.

[0029] Please refer to Figure 7 , Figure 10 and Figure 11 , wherein, an air cavity 405 is jointly formed inside the energy storage wheel 110 and the ramming rod 109. A vertical pipe 400 communicating with the outside is formed at the bottom of the air cavity 405. The outer surface of the air cavity 405 is provided with a vertical pipe 400 communicating with the outside. A piston piece 402 adapted to it is slidably connected inside the air cavity 405, and the piston piece 402 is located between multiple vertical pipes 400 and multiple side pipes 401. A tension spring 404 fixedly connected to the air cavity 405 is fixedly connected to the bottom of the piston piece 402. A counterweight ball 403 is fixedly connected to the inside of the piston piece 402. At the same time, when gas enters the interior of the air cavity 405, the ramming rod 109 rams on the mold. At this time, the gas is discharged through the vertical pipe 400, forming an air cushion layer on the contact surface between the hammer rod and the sand mold, reducing friction and wear. At the same time, it can accelerate the particle movement of the original sand around the hammer head, forming a more concentrated shock wave. The high-pressure air flow can blow away the attached original sand on the surface of the hammer head. When the ramming rod 109 moves upward to store energy, the hinge block 307 will reset to close the flow dividing cavity 300, so that the gas is ejected through the exhaust pipe 209.

[0030] It is worth mentioning that the positioning frame 200 can be adjusted so that the energy storage wheel 110 is located at the center position of the limiting groove 202. At this time, the movement of the ram rod 109 will not touch the pressing piece 301 or the top handle 207, making the centrifugal fan blade 203 unable to rotate. Thus, the suction and discharge work is formed by the movement of the piston piece 402. During this process, when the ram rod 109 strikes, the counterweight ball 403 will be quickly moved downward under the action of inertia, so that the gas is discharged through the side pipe 401 and horizontally sweeps across the mold and the green sand. The parallel air flow is evenly distributed along the surface of the mold, forming a synergistic effect with the impact direction of the hammering. When the hammer head impacts the green sand, under the combined action of the impact force, gravity and air flow drag force, the particles are more likely to undergo horizontal sliding and interlayer shear movement along the surface of the mold. This movement mode helps the particles to break through the static friction threshold, achieve more efficient position rearrangement and pore filling, thereby improving the overall density of the material. At the same time, the parallel gas can extract the gas perpendicular to the mold released by the previous vertical pipe 400 from the mold, reducing the disordered collision between the gas and the particles.

[0031] Specifically, when the over-driven positioning frame 200 moves upward so that the energy storage wheel 110 is located at the lower inner position of the limiting groove 202, during the movement of the energy storage wheel 110, the rapid downward movement of the energy storage wheel 110 will touch the pressing piece 301 and drive the arc-shaped plate 302 to tilt, thereby raising the position of the slider 306, making the crank 308 tilt and opening the solution soft shell 310 to introduce external air into the inside of the shunt cavity 300. At the same time, the tilt of the arc-shaped plate 302 will push the push handle 303 to push the plug rod 305 out of the drain port 304, opening the drain port 304 for the gas to flow out into the inside of the air cavity 405. As the slider 306 moves upward, it will drive the straight groove plate 206 to move, making the centrifugal fan blade 203 continuously rotate to inhale gas. After the ram rod 109 strikes the mold, the gas will flow in the air cavity 405 and be discharged through multiple vertical pipes 400, thus blowing towards the mold. It is also possible to operate the positioning frame 200 to move so that the energy storage wheel 110 is located at the center position of the limiting groove 202. At the same time, after the ram rod 109 quickly strikes the mold, the counterweight ball 403 will drive the piston piece 402 to continuously move downward under the action of inertia, and then drive the gas to be discharged through the side pipe 401 while the vertical pipe 400 generates suction, forming a gas film for protection.

[0032] In summary, the slider 306 and the shunt component on one side provided inside the shunt cavity 300 can flexibly change the operation path of the gas transmission component according to the working state of the device, achieving efficient gas shunting. This design enables the gas to be distributed to different working areas as needed, improving the gas utilization efficiency and pertinence, ensuring that each working link obtains sufficient and appropriate air flow support. The top of the slider 306 abuts against the straight groove plate 206. During the operation of the device, the movement of the slider 306 can assist in driving the movement of the straight groove plate 206, so that the gas transmission component operates continuously. This avoids the instability of the ramming process caused by the intermittent operation of the gas transmission component, provides a stable and continuous air flow supply for the entire ramming process, and ensures the consistency of the ramming effect. When the gas enters the inside of the air cavity 405 and the rammer 109 rams the mold, the gas is discharged through the vertical pipe 400, forming an air cushion layer on the contact surface between the hammer rod and the sand mold. This air cushion layer effectively reduces the friction and wear between the hammer rod and the sand mold, extends the service life of the hammer rod, and at the same time reduces the influence of the heat generated by friction on the quality of the sand mold and the casting. The discharged gas can accelerate the particle movement of the green sand around the hammer head, forming a more concentrated shock wave. This shock wave helps the green sand particles to better fill the mold cavity, improving the density and surface quality of the casting. At the same time, the high-pressure air flow can blow away the attached green sand on the surface of the hammer head, keeping the hammer head clean and further improving the ramming effect. When the positioning frame 200 is adjusted so that the energy storage wheel 110 is located at the center position of the limit groove 202, the rammer 109 rams, causing the counterweight ball 403 to move rapidly downward under the action of inertia, driving the piston piece 402 to move, and discharging the gas through the side pipe 401 to sweep the mold and the green sand in parallel. The parallel air flow is evenly distributed along the surface of the mold and acts synergistically with the hammering impact direction, making the particles more likely to undergo horizontal sliding and interlayer shear movement under the combined action of the impact force, gravity and air flow drag force, breaking through the static friction threshold, achieving more efficient position rearrangement and pore filling, and thus improving the overall density of the material.

[0033] Working principle: During use, the connecting steel frame 100 is installed above the sand mold. By driving the driving motor 101 to operate, the driving wheel 104 rotates. It drives the driven wheel 105 to rotate through the belt, causing the rotating rod 107 to rotate, and the centrifugal hammer piece 108 continuously abuts against the energy storage wheel 110 to raise the height of the rammer 109 to store energy for it. When the centrifugal hammer piece 108 disengages from the energy storage wheel 110, the rammer 109 will be affected by gravity and hammer the mold. At the same time, the driving cylinder 201 is turned on to adjust the position of the positioning frame 200. By driving the positioning frame 200 to move downward, the force storage wheel 110 is placed at a high position in the limiting groove 202, so that the force storage wheel 110 contacts the top handle 207 when moving upward and squeezes the compression spring 208. As the top handle 207 moves upward, the straight groove plate 206 is driven to move upward, thereby driving the rotating handle 204 to rotate, and then the centrifugal blades 203 are driven to rotate through the inertia wheel 205. Then, the straight groove plate 206 is reset to drive the rotating handle 204 to reset. Under the action of the inertia wheel 205, the centrifugal blades 203 will continue to rotate, thereby introducing external air into the interior of the positioning frame 200, and then discharged through the exhaust pipe 209 to blow toward the mold, thereby dissipating heat; When the positioning frame 200 is driven to move upward so that the power storage wheel 110 is located at the lower position in the limiting groove 202, during the movement of the power storage wheel 110, the power storage wheel 110 moves downward quickly to contact the pressing sheet 301 and drive the arc-shaped plate 302 to tilt, thereby raising the position of the slider 306, so that the crank 308 tilts and opens the solution soft shell 310 to introduce external air into the diversion chamber 300. At the same time, the tilt of the arc-shaped plate 302 pushes the push handle 303 to push the plug rod 305 out of the discharge port 304, and the discharge port 304 is opened to allow gas to flow out to the inside of the air cavity 405. As the slider 306 moves upward, the straight groove plate 206 is driven to move so that the centrifugal blades 203 continue to rotate to inhale gas. After the tamping rod 109 hammers the mold, the gas will flow in the air cavity 405 and be discharged through multiple vertical pipes 400, thereby blowing toward the mold. The positioning frame 200 can also be operated to move so that the power storage wheel 110 is located at the center of the limiting groove 202. At the same time, after the tamping rod 109 quickly hammers the mold, the counterweight ball 403 will drive the piston plate 402 to continue to move downward under the action of inertia, thereby driving the gas to be discharged through the side pipe 401 and the vertical pipe 400 to generate air suction, forming an air film to produce protection.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An eccentric hammer ramming device for sand casting, comprising a connecting steel frame (100) and two ramming rods (109) for ramming, characterized in that, Further included are: A positioning frame (200), which is arranged on one side of the connecting steel frame (100) and is used to guide two ramming rods (109). A power storage wheel (110) is fixedly connected to one side of each of the two ramming rods (109). A limiting groove (202) adapted to the power storage wheel (110) is formed inside the positioning frame (200). An exhaust pipe (209) is fixedly connected to the bottom of the positioning frame (200). An air delivery component that operates in cooperation with the power storage wheel (110) is arranged inside the positioning frame (200). A ramming component for driving the power storage wheel (110) to move is arranged on one side of the connecting steel frame (100); A flow splitting cavity (300), which is formed inside the positioning frame (200). A slider (306) for driving the air delivery component to operate is arranged inside the flow splitting cavity (300), and a flow splitting component for changing the operation path of the air delivery component is arranged on one side of the slider (306).

2. The eccentric hammer ramming device for sand casting according to claim 1, characterized in that: The air delivery component includes a centrifugal fan blade (203) arranged inside the positioning frame (200). A rotating handle (204) is rotatably connected inside the positioning frame (200). The outer surface of the rotating handle (204) is connected to the centrifugal fan blade (203) through an inertia wheel (205). A top handle (207) is slidably connected inside the positioning frame (200), and the top handle (207) can be in contact with the power storage wheel (110). One end of the top handle (207) is fixedly connected to a straight groove plate (206), and one end of the rotating handle (204) is placed inside the straight groove plate (206).

3. The tamping device for an eccentric hammer used in sand casting according to claim 2, wherein: The flow splitting component includes a crank (308) rotatably connected to the outer surface of the slider (306). A hinge block (307) is rotatably connected to one side of the flow splitting cavity (300). The crank (308) is rotatably connected to the hinge block (307). A flow splitting piece (309) is fixedly connected inside the positioning frame (200). The hinge block (307) is used to block the flow splitting cavity (300). The top of the slider (306) is in contact with the straight groove plate (206).

4. The tamping device for an eccentric hammer used in sand casting according to claim 3, characterized in that: A pressing piece (301) is rotatably connected inside the flow splitting cavity (300), and the power storage wheel (110) can be in contact with the pressing piece (301). An arc-shaped piece plate (302) is fixedly connected to the outer surface of the pressing piece (301), and the arc-shaped piece plate (302) can be in contact with the bottom of the slider (306). One end of the arc-shaped piece plate (302) is rotatably connected to a pushing handle (303). A discharge port (304) communicating with the flow splitting cavity (300) is formed inside the positioning frame (200). A plug rod (305) rotatably connected to the pushing handle (303) is arranged inside the discharge port (304).

5. The eccentric hammer ramming device for sand casting according to claim 1, characterized in that: An air cavity (405) is jointly formed inside the power storage wheel (110) and the ramming rod (109). A vertical pipe (400) communicating with the outside is formed at the bottom of the air cavity (405). A vertical pipe (400) communicating with the outside is formed on the outer surface of the air cavity (405).

6. The eccentric hammer ramming device for sand casting according to claim 5, wherein: A piston piece (402) adapted to it is slidably connected inside the air chamber (405), and the piston piece (402) is located between a plurality of vertical pipes (400) and a plurality of side pipes (401). A tension spring (404) fixedly connected to the air chamber (405) is fixedly connected to the bottom of the piston piece (402), and a counterweight ball (403) is fixedly connected inside the piston piece (402).

7. An eccentric hammer ramming device for sand mold casting according to claim 4, characterized in that: A driving cylinder (201) is fixedly connected to the top of the connecting steel frame (100), and the output end of the driving cylinder (201) extends to the top of the positioning frame (200) and is fixedly connected. A limiting piece (111) is fixedly connected to the top of the ramming rod (109), and the limiting piece (111) is used to limit the detachment of the ramming rod (109).

8. The eccentric hammer ramming device for sand casting according to claim 1, characterized in that: The ramming assembly includes a bearing seat (106) fixedly connected to one side of the connecting steel frame (100), and a rotating rod (107) is rotatably connected inside the bearing seat (106). Two centrifugal hammer pieces (108) are arranged in an alternating manner on the outer surface of the rotating rod (107), and the two centrifugal hammer pieces (108) are respectively in contact with two energy storage wheels (110).

9. The eccentric hammer ramming device for sand casting according to claim 8, characterized in that: An auxiliary support plate (102) is fixedly connected to one side of the connecting steel frame (100). A driving motor (101) is fixedly connected to the top of the auxiliary support plate (102). The output end of the driving motor (101) is fixedly connected to a driving wheel (104). One end of the rotating rod (107) is fixedly connected to a driven wheel (105) belt-connected to the driving wheel (104). A protective shell (103) sleeving the outer surfaces of the driving wheel (104) and the driven wheel (105) is fixedly connected to one end of the connecting steel frame (100).

10. The eccentric hammer ramming device for sand casting according to claim 3, characterized in that: A solution soft shell (310) is fixedly connected to the bottom of the flow dividing piece (309). A discharge port (311) is opened at the bottom of the solution soft shell (310). The solution soft shell (310) is made of rubber material and stores alcohol inside.

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