Handheld pneumatic tamping machine

Abstract

The utility model relates to the technical field of vibrating machinery, in particular to a handheld pneumatic tamping machine, and aims to solve the problems that in the manufacturing process of cylinder body parts of an existing handheld pneumatic tamping machine, non-axial symmetry generally exists in structures such as a cylinder body return stroke air inlet hole channel and an air exhaust groove, and the manufacturing cost is low. And therefore, the problems that the heat treatment deformation is large and the hole channel grinding convenience is poor during cylinder body machining, and finally the machining yield and efficiency of cylinder body parts are low are solved. According to the pneumatic tamping machine, the first return stroke air inlet hole channel and the air exhaust grooves of the cylinder body are axially symmetrical to the cylinder body, so that the first return stroke air inlet hole channel is symmetrical and arranged between the corresponding air exhaust grooves in the middle, and then the stroke air inlet hole channel is arranged to directly intake air from the center of the air inlet valve bank of the cylinder body; and the second return stroke air inlet ducts are symmetrically arranged on the two sides of the stroke air inlet duct, so that the machining convenience and the heat treatment process performance of cylinder body parts are further improved under the condition that good air distribution working conditions of the air inlet valve bank and the cylinder body of the tamping machine are ensured.

Description

Technical Field

[0001] This utility model relates to the field of vibratory tamping machinery technology, specifically to a handheld pneumatic tamping machine. Background Technology

[0002] Handheld pneumatic tamping machines are mainly used for tamping foundry sand molds, compacting furnace linings, and compacting concrete and roadbed earthwork. The power for this type of pneumatic tamping machine comes from compressed air entering the connecting pipe via a handle switch, and then through the connecting pipe and cylinder nut into the tamping machine's interior. A crescent-shaped valve in the valve cabinet radially reciprocates, creating the stroke and return air inlets in the cylinder. During the stroke, the rear chamber of the cylinder receives high-pressure air, which expands and pushes the piston forward. When the piston exceeds the return air inlet, the return air inlet is activated. When passing through the exhaust port, the pressure in the rear chamber of the cylinder decreases while the pressure in the front chamber increases. The compressed gas then flows through the return passage, causing the passive crescent valve to switch. After the valve switches, the high-pressure gas in the front chamber of the cylinder expands and does work, pushing the piston backward. When the piston moves backward past the exhaust port, the pressure in the front chamber decreases while the pressure in the rear chamber increases. The compressed gas then flows through the stroke passage, causing the crescent valve to switch again. This creates the reciprocating motion of the piston within the cylinder. The piston drives the hammer head to reciprocate, thus forming the working state of the tamping machine. However, the cylinder design of this type of pneumatic tamping machine generally suffers from an asymmetrical return air inlet structure, resulting in poor heat treatment performance and difficulty in grinding the cylinder bores. This leads to significant deformation during heat treatment of the cylinder, making subsequent straightening and grinding of the inner bores extremely difficult. Ultimately, this results in a low yield rate and high processing difficulty for the cylinder parts, significantly impacting the overall production efficiency and quality of the pneumatic tamping machine. Utility Model Content

[0003] This invention provides a handheld pneumatic tamping machine to solve the problems mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A handheld pneumatic tamping machine includes a handle connected to a connecting pipe, which is connected to a cylinder nut. A cylinder is fitted inside the cylinder nut, and a piston is installed inside the cylinder. A hammer head is connected to one end of the piston extending out of the cylinder. A valve is fitted inside the cylinder nut, and the valve is connected to a stroke air inlet channel. The stroke air inlet channel communicates with the inside of the cylinder. A first return air inlet channel is symmetrically provided on the outer wall of the cylinder. A second return air inlet channel is provided between the first return air inlet channel and the stroke air inlet channel. Multiple exhaust grooves are symmetrically provided on the outer wall of the cylinder in matching the first return air inlet channel.

[0006] Furthermore, a valve cabinet is fitted inside the cylinder nut, a valve cover is connected to the side of the valve cabinet, and the valve is centrally located inside the valve cover.

[0007] Furthermore, an exhaust port is provided between the first return air intake channel and the inner side of the cylinder block, and multiple exhaust channels are symmetrically provided on the side wall of the cylinder block.

[0008] Furthermore, the stroke air intake channel is symmetrically connected with multiple air intake slots.

[0009] Furthermore, the valve cabinet is also symmetrically provided with air inlets on the side near the connecting pipe.

[0010] This utility model has the following beneficial effects:

[0011] This utility model provides a handheld pneumatic tamping machine. By arranging the first return air inlet of the cylinder body symmetrically with the cylinder's axis, and also arranging the cylinder's exhaust grooves symmetrically with the cylinder's axis, the first return air inlet is symmetrically and centrally positioned between the corresponding exhaust grooves. Furthermore, the original stroke air inlet is configured to directly intake air from the center of the cylinder's air inlet valve assembly, with the second return air inlet symmetrically arranged on both sides of the stroke air inlet. Simultaneously, multiple air inlet grooves and air inlets are evenly distributed along the valve cabinet cross-section, ensuring the pneumatic tamping machine's air inlet valve... Under the condition that the assembly and cylinder form a good air distribution working condition, the machining convenience and heat treatment performance of the cylinder parts of the pneumatic tamping machine are further improved, thereby effectively improving the machining quality of the cylinder parts of the pneumatic tamping machine, reducing the overall production cost of the pneumatic tamping machine, and solving the problem that in the current process of manufacturing cylinder parts of existing handheld pneumatic tamping machines, due to the non-axial symmetry of the cylinder return air inlet and exhaust groove, the cylinder parts are generally subjected to large heat treatment deformation and poor convenience of hole grinding, which ultimately leads to low yield and efficiency of cylinder parts machining. Attached Figure Description

[0012] Figure 1 This is a front cross-sectional view of the overall structure of this utility model.

[0013] Figure 2 This is a side view of the valve assembly structure of this utility model.

[0014] Figure 3 The valve assembly structure of this utility model Figure 2 A schematic diagram of the AA section.

[0015] Figure 4 The valve assembly structure of this utility model Figure 2 A schematic diagram of the BB cross section.

[0016] Figure 5 This is a side view of the cylinder structure of this utility model.

[0017] Figure 6 This is a front view of the HC cross-section of the cylinder block structure of this utility model.

[0018] Figure 7 This is a side view FF section schematic diagram of the cylinder block structure of this utility model.

[0019] Figure 8 This is a front view of the PD cross section of the cylinder block structure of this utility model.

[0020] The meanings of the reference numerals in the attached figures are as follows:

[0021] 1. Handle; 2. Connecting pipe; 3. Cylinder nut; 4. Air guide cover; 5. Cylinder; 6. Piston; 7. Front nut; 8. Hammer; 9. First return stroke air intake channel; 10. Exhaust channel; 11. First positioning hole; 12. Exhaust groove; 13. Valve cabinet; 14. Valve; 15. Valve cover; 16. Second return stroke air intake channel; 17. Second positioning hole; 18. Stroke air intake channel; 19. Air intake groove; 20. Air intake port; 21. Exhaust port. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-8 As shown, a handheld pneumatic tamping machine includes a handle 1, a connecting pipe 2 connected to the handle 1, a cylinder nut 3 connected to the connecting pipe 2, a cylinder 5 being fitted inside the cylinder nut 3, a piston 6 being fitted inside the cylinder 5, and a hammer 8 being installed at one end of the piston 6 extending out of the cylinder 5.

[0024] A valve cabinet 13 is fitted inside the cylinder nut 3. A valve cover 15 is installed on the side of the valve cabinet 13. A valve 14 is installed in the center of the inner side of the valve cover 15. The valve 14 is connected to a stroke intake channel 18. The stroke intake channel 18 is connected to the inner side of the cylinder 5. A first return intake channel 9 is symmetrically machined on the outer wall of the cylinder 5. A second return intake channel 16 is connected between the first return intake channel 9 and the stroke intake channel 18. An exhaust port 21 is connected between the first return intake channel 9 and the inner side of the cylinder 5. Two sets of exhaust grooves 12 are also symmetrically machined on the outer wall of the cylinder 5, matching the first return intake channel 9.

[0025] Four exhaust channels 10 are symmetrically machined on the side wall of the cylinder 5. The stroke intake channel 18 is also symmetrically and evenly connected with four intake slots 19. A set of intake holes 20 is symmetrically opened on the side of the valve cabinet 13 near the connecting pipe 2.

[0026] In practical application, the cylinder 5 of the handheld pneumatic tamping machine is pre-processed. The first return air inlet 9 of the cylinder 5 is processed into a layout symmetrical to the axis of the cylinder 5. The exhaust groove 12 of the cylinder 5 is then processed into a layout symmetrical to the axis of the cylinder 5, so that the first return air inlet 9 is symmetrically and centrally arranged between the corresponding exhaust grooves 12. The stroke air inlet 18 is then processed to allow direct air intake from the center of the cylinder 5 air intake valve group, so that the second return air inlet 16 is symmetrically arranged on both sides of the stroke air inlet 18. At the same time, four sets of air inlet grooves 19 and one set of air inlets 20 are uniformly processed along the cross section of the valve cabinet 13. Finally, the processed cylinder 5 and the valve group of the valve cabinet 13 are installed together and properly matched with the overall components of the handheld pneumatic tamping machine to form a handheld pneumatic tamping machine with improved and optimized structure. When this handheld pneumatic tamping machine is in use, compressed air is used as the power source. The compressed air enters the connecting pipe 2 through the switch of the handle 1, and then enters the tamping machine through the connecting pipe 2 and the cylinder nut 3. It then enters the air chamber between the cylinder nut 3 and the valve cabinet 13 through a set of air inlets 20, and then enters the valve cabinet 13 through four sets of air inlets 19. This pushes the valve 14 to axially reciprocate to open and close the valve cabinet 13, thereby forming the stroke air intake and return air intake of the cylinder 5.

[0027] During the stroke intake, compressed air enters the four sets of intake slots 19 and pushes valve 14 backward. At the same time, compressed air enters the rear chamber of cylinder 5 through stroke intake port 18, realizing high-pressure gas expansion and work, and pushing piston 6 forward. When piston 6 moves beyond the position of exhaust port 21, the pressure in the rear chamber of cylinder 5 decreases while the pressure in the front chamber increases, causing compressed air to enter valve cabinet 13 through the first return intake port 9 of cylinder 5 and the second return intake port 16 of valve cabinet 13, and pushing valve 14 forward. After valve 14 reverses, compressed air enters the front chamber through the second return intake port 16 of cylinder 5, forming high-pressure gas expansion and work, and pushing piston 6 backward. When the piston 6 moves backward beyond the position of the exhaust port 21, the pressure in the front chamber of the cylinder 5 decreases while the pressure in the rear chamber increases, causing compressed air to enter the valve cabinet 13 through the stroke intake port 18 and push the valve 14 to reverse again. This forms the process of the piston 6 reciprocating in the cylinder 5. The piston 6 drives the hammer head 8 to reciprocate and impact, thus forming the working state of the handheld pneumatic tamping machine. The optimized and improved structure of the cylinder body 5 and valve cabinet 13 of this handheld pneumatic tamping machine further enhances the ease of machining and heat treatment performance of the cylinder body 5 parts while ensuring good air distribution between the inlet valve group and the cylinder body 5. This effectively improves the machining quality of the cylinder body 5 parts, reduces the overall production and application cost of the pneumatic tamping machine, and solves the problem of low yield and efficiency in the machining of cylinder body 5 parts due to the non-axial symmetry of the cylinder body 5 return air inlet channel and exhaust groove 12, which is common in the current manufacturing process of cylinder body 5 parts.

Claims

1. A handheld pneumatic tamping machine, comprising a handle (1), a connecting pipe (2) connected to the handle (1), a cylinder nut (3) connected to the connecting pipe (2), a cylinder (5) being fitted inside the cylinder nut (3), a piston (6) being provided inside the cylinder (5), and a hammer (8) being connected to one end of the piston (6) extending out of the cylinder (5), characterized in that: A valve (14) is fitted inside the cylinder nut (3). The valve (14) is connected to a stroke intake channel (18). The stroke intake channel (18) is connected to the inside of the cylinder (5). The outer wall of the cylinder (5) is symmetrically provided with a first return intake channel (9). A second return intake channel (16) is connected between the first return intake channel (9) and the stroke intake channel (18). Multiple exhaust grooves (12) are symmetrically provided on the outer wall of the cylinder (5) in match with the first return intake channel (9).

2. The handheld pneumatic tamping machine according to claim 1, characterized in that: The cylinder nut (3) has a valve cabinet (13) inside, and a valve cover (15) is connected to the side of the valve cabinet (13). The valve (14) is centrally located inside the valve cover (15).

3. A handheld pneumatic tamping machine according to claim 1, characterized in that: The first return air intake channel (9) and the inner side of the cylinder (5) are connected by an exhaust port (21), and multiple exhaust channels (10) are symmetrically provided on the side wall of the cylinder (5).

4. A handheld pneumatic tamping machine according to claim 1, characterized in that: The stroke air intake channel (18) is symmetrically connected to multiple air intake slots (19).

5. A handheld pneumatic tamping machine according to claim 2, characterized in that: The valve cabinet (13) is also symmetrically provided with air inlets (20) on the side near the connecting pipe (2).

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