Pneumatic chipping hammer with improved structure

Abstract

A pneumatic chipping hammer with an improved structure comprises an outer shell and an inner shell, the outer shell is made of nonmetal, the outer shell comprises a handheld part and an installation part, an air inlet channel is arranged in the handheld part, the inner shell is made of metal materials, the inner shell is embedded in the installation part, the inner shell and the outer shell are of an integrated structure through injection molding, and an installation cavity is formed in the inner shell. The upper end of the air inlet channel is obliquely provided with a vent hole towards the upper rear portion, the vent hole is communicated with the air inlet channel and the installation cavity, a corresponding receding notch is obliquely formed in the position, penetrating through the vent hole, of the rear end of the inner shell, the rear end of the receding notch is provided with an air passing through hole communicated with the installation cavity, and the vent hole penetrates through the receding notch and is communicated with the installation cavity through the air passing through hole. The vent hole penetrates through the tail end of the mounting part to form a port, a plugging piece is arranged at the port, and the vent hole is formed by injection molding together with the outer shell through a core rod during injection molding. The multi-material combined shell is still light while the strength reaches the standard, the machining difficulty of the vent holes is reduced through the avoiding notches, and the yield is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic tools, in particular to an air shovel. Background Art

[0002] An air shovel is a pneumatic tool with multiple functions, including cutting, hammering, drilling, and slotting. It's primarily used for sand removal from castings, deburring large, medium, and small castings, and repairing openings in stone, concrete, and brick walls. Powered by compressed air, the air shovel's cylinder reciprocates a piston, which drives the shovel's reciprocating motion, allowing the shovel to chisel metal and building materials. For example, the air shovel disclosed in utility model publication number CN217475871U has an internal vent hole connecting the air inlet and the cylinder. The vent hole is typically drilled using a drill bit after the shell is manufactured.

[0003] However, the air shovels in the prior art have the following problems: 1. Some of the air shovel shells in the above patents are made of metal materials alone. Although they are strong, the finished product is too heavy and the cost is high. 2. Some air shovel shells are made of plastic alone. Although the finished product is light and the cost is relatively low, the strength cannot meet the use requirements. 3. There is also a type of air shovel shell that is made of a combination of metal and plastic. Although the weight of the finished product is reduced and the strength can meet the use requirements, it is difficult to process and has a high scrap rate. Because the air vent connecting the air intake channel and the cylinder needs to pass through the metal material area and the plastic area at the same time, these two different materials have different requirements for the drill speed, power and drill type when processing the channel. It is difficult to take into account the processing requirements of two different materials when processing the channel, resulting in great difficulty in channel processing and a high product scrap rate. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the existing technology and to propose an air shovel structure with a shell made of metal material and plastic and easy to process.

[0005] The purpose of this utility model can be achieved through the following technical solutions:

[0006] 18. The air shovel of claim 17, wherein the air shovel comprises an outer shell and an inner shell, the outer shell being made of plastic, the outer shell comprising a hand-held portion and a mounting portion, an air inlet channel being provided in the hand-held portion, the inner shell being made of metal material, the inner shell being embedded in the mounting portion and injection-molded with the outer shell to form an integrated structure, a mounting cavity being provided in the inner shell, the upper end of the air inlet channel being inclined upward and rearward and provided with an air vent, the air vent connecting the air inlet channel and the mounting cavity, a corresponding avoidance notch being obliquely provided at the place where the air vent passes through the rear end of the inner shell, an air through-hole communicating with the mounting cavity being provided at the rear end of the avoidance notch, the air through-hole passing through the avoidance notch and being connected to the mounting cavity through the air through-hole, the air through-hole passing through the tail end of the mounting portion to form a port, a sealing member being provided at the port, the air vent being injection-molded together with the outer shell through a core rod during injection molding, or being formed by drilling a hole in the outer shell by a drill bit.

[0007] The outer shell occupies a larger part of the entire air shovel. Setting it to be made of plastic can effectively reduce the overall weight of the air shovel; the installation cavity is the main working part of the air shovel. Setting the inner shell to be made of metal material can effectively ensure the strength of the installation cavity and the overall structural strength of the air shovel; using two materials for the shell of the air shovel can ensure the strength of the shell while avoiding the overall weight being too heavy, making it lighter to use and reducing manufacturing costs; and the inner shell made of metal material can play a role in adjusting the center of gravity, and the handheld part of the plastic outer shell has a better gripping feel, which can effectively improve the comfort of using the air shovel.

[0008] Because a clearance notch is provided at the vent hole of the inner shell, the vent hole can be directly injection molded, or the drill bit only needs to pass through the plastic area during drilling, without having to pass through the metal material at the same time, overcoming the technical problems existing in the prior art. By directly providing an air through hole between the vent hole and the mounting cavity, the air path can be connected, realizing the air shovel function. The above-mentioned technical features of this technical solution, through structural optimization and joint cooperation, reduce the weight of the air shovel, ensure the strength of the shell, reduce the processing difficulty, and improve the product qualification rate while realizing the air shovel function.

[0009] The metal material used to make the inner shell can be aluminum, zinc alloy, titanium alloy, etc.

[0010] A sheath is provided on the outer surface of the outer shell, and the sheath covers the port and the blocking piece.

[0011] Use a sheath to cover the port and the plug to make the air shovel more beautiful overall.

[0012] The sheath extends from the mounting portion to the outer surface of the hand-held portion.

[0013] The cover can increase the grip and make the air shovel more comfortable to use.

[0014] A cylinder, a reversing valve and a shock-absorbing pad are arranged in sequence from front to back in the installation cavity. A piston is provided in the cylinder, and the piston reciprocates in the cylinder. The rear side of the shock-absorbing pad abuts against the rear wall of the installation cavity, and the front side abuts against the reversing valve.

[0015] When the air shovel is working, the piston inside the cylinder will reciprocate. When the piston moves from front to back, it will hit the reversing valve, causing the workpiece inside the air shovel to vibrate. The shock-absorbing pad can absorb the kinetic energy generated by the piston hitting the reversing valve, reduce vibration, and prevent the workpiece from being damaged by vibration.

[0016] A gasket is provided between the cylinder and the reversing valve. The gasket is provided with a gasket through hole for ventilation between the reversing valve and the interior of the cylinder. The gasket is made of metal.

[0017] Setting the upper gasket can prevent the reversing valve from being directly hit by the piston. The gasket can absorb part of the impact force from the piston, effectively protecting the reversing valve, preventing the reversing valve from being damaged by the impact of the piston, making the air shovel more durable, and using metal to make the gasket more durable.

[0018] A reversing valve plate is provided inside the reversing valve, and the reversing valve plate is made of metal.

[0019] The previous reversing valve discs were all made of wood. After being replaced with reversing valve discs made of metal, they have a longer service life and are more durable.

[0020] A groove is provided on the outer peripheral wall of the front portion of the cylinder, and a rubber sleeve is provided in the groove.

[0021] When using an air shovel, workers will grip the front of the cylinder to stabilize the shovel. Since the cylinder is made of metal, the temperature of the cylinder will drop in cold weather. When the air shovel is working, the piston reciprocates in the cylinder to generate heat, causing the cylinder temperature to rise. Too high or too low a temperature will affect the gripping feel of the cylinder. In addition, the friction of the metal cylinder is small and not easy to grip. The rubber sleeve has a good heat insulation effect and a large friction, which can effectively improve the gripping feel and make the cylinder easier to grip.

[0022] A sealing plug is provided on the air intake channel, an opening and closing pin is provided in the air intake channel, the opening and closing pin has a limiting surface that can abut against the sealing plug, and an elastic part that can press the opening and closing pin toward the sealing plug is also provided in the air intake channel. The top end of the opening and closing pin is located above the sealing plug, and a trigger is provided on the hand-held part, and the trigger has a trigger rod that extends into the air intake channel and can apply pressure to the opening and closing pin.

[0023] This technical solution places the opening and closing pin within the air inlet passage of the outer shell's handle, rather than placing it on the trigger at the upper front of the handle (as shown in the prior art patent with publication number CN217475871U), which can increase the single air intake throughput of the air shovel. In the current prior art structure, it is difficult to directly injection mold or machine the vent holes for an air shovel with the opening and closing pin placed within the air inlet passage of the outer shell's handle. Applying the technical invention of this patent to an air shovel with this structure can more effectively achieve the invention purpose of this patent.

[0024] An air outlet channel is provided on the handheld portion, an air outlet port of the air outlet channel is downwardly arranged, an air outlet baffle is provided on the air outlet port, and an air outlet hole is provided on the air outlet baffle.

[0025] Exhaust gas downwards can prevent dust generated when the air shovel is working from being raised, which is more environmentally friendly; the setting of the air outlet baffle and the air outlet hole can prevent the exhaust gas flow from being too strong and raising dust.

[0026] Compared with the existing technology, this air shovel has the following advantages:

[0027] The shell of the air shovel is divided into an inner shell and an outer shell. The inner shell is made of metal material and the outer shell is made of plastic. This makes the air shovel shell have a certain strength while being lightweight and low in manufacturing cost. The avoidance notch allows the drill bit to not pass through the metal material area when drilling through holes in the shell, but only needs to drill holes in one material, which simplifies the manufacturing of the air shovel and reduces processing costs. Using a core rod to process through holes is simpler than using a drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the air shovel.

[0029] Figure 2 This is a schematic diagram of the explosion structure of the air shovel.

[0030] Figure 3 is a schematic diagram of the inner shell.

[0031] Figure 4 yes Figure 1 A partial enlarged view of the .

[0032] In the figure, 1. outer shell; 11. hand-held part; 12. mounting part; 13. trigger; 131. trigger rod; 14. air inlet channel; 141. sealing plug; 142. limit surface; 143. opening and closing pin; 144. elastic part; 15. vent; 151. port; 152. blocking part; 16. sheath; 17. air outlet channel; 171. air outlet port; 172. air outlet baffle; 173. air outlet; 2. inner shell; 21. shock-absorbing pad; 22. cylinder; 221. piston; 222. groove; 223. rubber sleeve; 23. reversing valve; 231. reversing valve plate; 24. gasket; 241. gasket through hole; 25. mounting cavity; 26. notch; 27. air through hole. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] like Figures 1 to 4 As shown, an improved air shovel structure includes an outer shell 1 and an inner shell 2. The outer shell 1 is made of plastic and includes a handheld portion 11 and a mounting portion 12. The handheld portion 11 is provided with an air intake passage 14. The inner shell 2 is made of metal material. The inner shell 2 is embedded in the mounting portion 12 and is injection molded into an integral structure with the outer shell 1. A mounting cavity 25 is provided in the inner shell 2. The upper end of the air intake passage 14 is tilted upward and backward to provide a vent hole 15. The vent hole 15 connects the air intake passage 14 and the mounting portion 12. The mounting cavity 25, a corresponding avoidance notch 26 is obliquely provided at the place where the vent hole 15 passes through the rear end of the inner shell 2, and a gas through-hole 27 communicating with the mounting cavity 25 is provided at the rear end of the avoidance notch 26. The vent hole 15 passes through the avoidance notch 26 and is connected to the mounting cavity 25 through the gas through-hole 27. The vent hole 15 passes through the tail end of the mounting portion 12 to form a port 151, and a sealing member 152 is provided at the port 151. The vent hole 15 is injection molded together with the outer shell 1 through a core rod during the injection molding process.

[0035] The outer shell 1 occupies a larger part of the entire air shovel. Setting it to be made of plastic as a whole can effectively reduce the overall weight of the air shovel; the installation cavity 25 is the main working part of the air shovel. Setting the inner shell 2 to be made of metal material can effectively ensure the strength of the installation cavity 25 and ensure the overall structural strength of the air shovel; using two materials for the shell of the air shovel for the above-mentioned setting can ensure the strength of the shell while avoiding the overall weight being too heavy, making it lighter to use and reducing manufacturing costs; and the inner shell 2 made of metal material can play a role in adjusting the center of gravity, and the handheld part 11 of the outer shell 1 made of plastic material has a better gripping feel, which can effectively improve the comfort of using the air shovel.

[0036] Because a relief notch 26 is provided where the vent hole 15 of the inner shell 2 passes, the vent hole 15 can be directly injection molded, or the drill bit only needs to pass through the plastic area during drilling, without also passing through the metal material, overcoming the technical problems of the existing technology. The air passage 27 is directly provided between the vent hole 15 and the mounting cavity 25 to achieve air communication and realize the air shovel function. The above-mentioned technical features of this technical solution, through structural optimization and synergy, reduce the weight of the air shovel, ensure the shell strength, reduce the processing difficulty, and improve the product qualification rate while realizing the air shovel function.

[0037] The use of the above-mentioned vent hole processing method will result in a port 151 being left at the tail end of the mounting portion 12. In order to be able to use the air shovel normally, it is necessary to set an upper sealing member 152 to seal the port 151; using a core rod to process the vent hole 15 is simpler than using a drill bit to drill a hole, has a lower scrap rate, and can greatly reduce manufacturing costs.

[0038] Further, such as Figure 1 、 Figure 2 As shown, a sheath 16 is provided on the outer surface of the outer shell 1 , and the sheath 16 covers the port 151 and the blocking member 152 . The sheath 16 extends from the mounting portion 12 to the outer surface of the handheld portion 11 .

[0039] Furthermore, a cylinder 22, a reversing valve 23 and a shock-absorbing pad 21 are arranged in sequence from front to back in the installation cavity 25. A piston 221 is provided in the cylinder 22, and the piston 221 reciprocates in the cylinder 22. One side surface of the shock-absorbing pad 21 abuts against the inner wall of the installation cavity 25, and the other side surface abuts against the reversing valve 23. A reversing valve plate 231 made of metal is provided inside the reversing valve 23.

[0040] Furthermore, a gasket 24 made of metal is provided between the cylinder 22 and the reversing valve 23 . The gasket 24 has a gasket through hole 241 for ventilation between the reversing valve 23 and the inside of the cylinder 22 . The gasket 24 can withstand the impact from the piston 221 .

[0041] Furthermore, a groove 222 is formed on the outer peripheral wall of the front portion of the cylinder 22 , and a rubber sleeve 223 is provided in the groove 222 .

[0042] Furthermore, a sealing plug 141 is provided on the air inlet channel 14, an opening and closing pin 143 is provided in the air inlet channel, the opening and closing pin 143 has a limiting surface 142 that can abut against the sealing plug 141, and an elastic member 144 that can press the opening and closing pin 143 toward the sealing plug 141 is also provided in the air inlet channel 14. The elastic member 114 is generally a spring, and the top of the opening and closing pin 143 is located above the sealing plug 141. A trigger 13 is provided on the hand-held part 11, and the trigger 13 has a trigger rod 131 that extends into the air inlet channel 14 and can apply pressure to the opening and closing pin 143.

[0043] Furthermore, an air outlet channel 17 is provided on the handheld portion 11 , an air outlet port 171 of the air outlet channel 17 is downwardly disposed, an air outlet baffle 172 is disposed on the air outlet port 171 , and an air outlet hole 173 is disposed on the air outlet baffle 172 .

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An air shovel with improved structure, characterized in that: The invention comprises an outer shell (1) and an inner shell (2), wherein the outer shell (1) is made of plastic, the outer shell (1) comprises a hand-held portion (11) and a mounting portion (12), an air inlet passage (14) is provided in the hand-held portion (11), the inner shell (2) is made of metal material, the inner shell (2) is embedded in the mounting portion (12) and is injection-molded with the outer shell (1) to form an integral structure, a mounting cavity (25) is provided in the inner shell (2), an upper end of the air inlet passage (14) is provided with an air vent (15) tilted upward and backward, the air vent (15) communicates with the air inlet passage (14) and the mounting cavity (25), and the inner shell ( 2) A corresponding avoidance notch (26) is obliquely provided at the passage of the rear end vent hole (15), and a ventilation hole (27) communicating with the mounting cavity (25) is provided at the rear end of the avoidance notch (26). The vent hole (15) passes through the avoidance notch (26) and is connected to the mounting cavity (25) through the ventilation hole (27). The vent hole (15) passes through the rear end of the mounting portion (12) to form a port (151), and a blocking member (152) is provided at the port (151). The vent hole (15) is injection molded together with the outer shell (1) through a core rod during injection molding, or is drilled and formed in the outer shell (1) by a drill bit.

2. The air shovel with improved structure according to claim 1, characterized in that: The outer surface of the outer shell (1) is provided with a sheath (16), and the sheath (16) covers the port (151) and the blocking member (152).

3. The air shovel with improved structure according to claim 2, characterized in that: The sheath (16) extends from the mounting portion (12) to the outer surface of the handheld portion (11).

4. The air shovel with improved structure according to claim 1, characterized in that: The installation cavity (25) is provided with a cylinder (22), a reversing valve (23) and a shock-absorbing pad (21) in sequence from front to back. A piston (221) is provided in the cylinder (22). The piston (221) reciprocates in the cylinder (22). The rear side of the shock-absorbing pad (21) abuts against the rear wall of the installation cavity (25), and the front side abuts against the reversing valve (23).

5. The air shovel with improved structure according to claim 4, characterized in that: A gasket (24) is provided between the cylinder (22) and the reversing valve (23). The gasket (24) has a gasket through hole (241) for ventilation between the reversing valve (23) and the inside of the cylinder (22). The gasket (24) is made of metal.

6. The air shovel with improved structure according to claim 4 or 5, characterized in that: A reversing valve plate (231) is provided inside the reversing valve (23), and the reversing valve plate (231) is made of metal.

7. The air shovel with improved structure according to claim 4, characterized in that: A groove (222) is provided on the outer peripheral wall of the front portion of the cylinder (22), and a rubber sleeve (223) is provided in the groove (222).

8. The air shovel with improved structure according to claim 1, characterized in that: The air inlet passage (14) is provided with a sealing plug (141), an opening and closing pin (143) is provided in the air inlet passage, the opening and closing pin (143) has a limiting surface (142) capable of abutting against the sealing plug (141), and the air inlet passage (14) is further provided with an elastic member (144) capable of applying pressure to the opening and closing pin (143) toward the sealing plug (141), the top end of the opening and closing pin (143) is located above the sealing plug (141), and the handheld part (11) is provided with a trigger (13), and the trigger (13) has a trigger rod (131) extending into the air inlet passage (14) and capable of applying pressure to the opening and closing pin (143).

9. The air shovel with improved structure according to claim 1, characterized in that: An air outlet channel (17) is provided on the handheld portion (11), an air outlet port (171) of the air outlet channel (17) is arranged downward, an air outlet baffle (172) is provided on the air outlet port (171), and an air outlet hole (173) is provided on the air outlet baffle (172).

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