Cylinder body structure of pneumatic nailing gun

Abstract

The utility model provides a cylinder body structure of a pneumatic nailing gun, and belongs to the technical field of nailing guns. The structure of the nailing gun is simplified while the nailing force of the nailing gun is improved. According to the cylinder body structure of the pneumatic nailing gun, the first cylinder body extends in the second direction to form the second cylinder body, the first cylinder body and the second cylinder body are both in a hollow cylindrical shape, the first cylinder body and the second cylinder body are coaxially arranged, the second cylinder body is located on the rear side of the first cylinder body, and the second cylinder body is communicated with the first cylinder body; the piston, the first cylinder body and the second cylinder body form air chambers, the air chambers comprise the first air chamber located in the first cylinder body and the second air chamber located in the second cylinder body, the inner diameter of the second cylinder body is larger than that of the first cylinder body, and the volume of the second air chamber is larger than that of the first air chamber. According to the scheme, the piston moves in the first cylinder body, the second cylinder body is arranged on the rear side of the first cylinder body, the volume of the second air chamber is larger than that of the first air chamber, the first air chamber can store more air, and the nailing force of the nailing gun is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nail guns, in particular to a pneumatic nail gun, and more particularly to a cylinder structure of the pneumatic nail gun. Background Art

[0002] A nail gun is a tool that drives nails into an object. It includes a shell impact part, a lifting part, a locking part, a nail magazine, a nail ejection part, a power supply part, a control system, a motor and a reduction mechanism.

[0003] In existing nail guns, the striking part includes a firing pin and a piston. The firing pin is mounted on the piston. The piston moves within the cylinder and forms a sealed air chamber with the piston. The air chamber is filled with gas. When the gas is compressed, high pressure is generated. When the nail gun is driving a nail, the high-pressure gas acts on the piston to push the piston to move. The piston drives the firing pin to move, and the firing pin strikes the nail in the nailing part to achieve nailing. When the firing pin is driving a nail, in order to better drive the nail into the object, the firing pin strikes the nail with a relatively large force. This requires that the pressure of the compressed gas in the air chamber be sufficiently large. In the prior art, in order to ensure that the pressure of the compressed gas in the air chamber is sufficiently large, additional elastic members are provided on the cylinder and piston. When the gas in the air chamber is compressed, the elastic member is also compressed. This can increase the force acting on the piston, thereby increasing the nailing force. However, this method adds additional structure, making the nail gun structure more complex and increasing the cost. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems in the existing technology and propose a cylinder structure of a pneumatic nail gun. The technical problem to be solved by the present invention is: how to improve the nailing force of the nail gun while simplifying the structure of the nail gun.

[0005] The object of the utility model can be achieved by optimizing the structure of a nail gun through the following technical solutions: a cylinder structure of a pneumatic nail gun, comprising a nail-producing part and a striking part for driving the nail in the nail-producing part out of the nail gun along a first direction, the striking part comprising a piston and a firing pin arranged on the piston, the piston moving in the first cylinder and driving the firing pin to reciprocate in the first direction and in a second direction opposite to the first direction, characterized in that the first cylinder extends in the second direction to form a second cylinder, the first cylinder and the second cylinder are both hollow cylindrical, the first cylinder and the second cylinder are coaxially arranged and the second cylinder is located at the rear side of the first cylinder, the second cylinder is connected to the first cylinder, the piston forms an air chamber with the first cylinder and the second cylinder, the air chamber comprises an air chamber 1 located in the first cylinder and an air chamber 2 located in the second cylinder, the inner diameter of the second cylinder is larger than the inner diameter of the first cylinder, and the volume of the air chamber 2 is larger than the volume of the air chamber 1.

[0006] In this solution, the piston has a limited range of movement within the first cylinder. The piston, the first cylinder, and the second cylinder form a closed air chamber, which includes air chamber 2 located in the second cylinder and air chamber 1 in the first cylinder. Air chamber 1 refers to the air storage space formed between the rear end of the first cylinder and the position of the piston in the first cylinder when the piston moves to its furthest position in the first direction in the first cylinder. By arranging the second cylinder behind the first cylinder, the inner diameter of the second cylinder is larger than that of the first cylinder, and the volume of air chamber 2 is larger than that of air chamber 1, air chamber 2 can store more gas, the pressure of the compressed gas is higher, and the nailing force of the nail gun is improved. Since the solution of arranging the second cylinder behind the first cylinder is easier to process than the solution of adding an elastic member, it can improve the nailing force of the nail gun while simplifying the structure of the nail gun. In addition, in this solution, the length and diameter of the second cylinder can be appropriately adjusted to avoid the second cylinder being too long or too large in diameter, which would affect the use of the nail gun.

[0007] In the cylinder structure of the pneumatic nail gun, the volume of the second air chamber is at least 1.3 times the volume of the first air chamber.

[0008] In the cylinder structure of the pneumatic nail gun, the volume of the second air chamber is 1.8 times the volume of the first air chamber.

[0009] In the above-mentioned cylinder structure of the pneumatic nail gun, the wall thickness of the first cylinder and the second cylinder are the same.

[0010] In the cylinder structure of the pneumatic nail gun, the wall thickness of the first cylinder and the second cylinder are both 2.5 mm.

[0011] In the above-mentioned cylinder structure of the pneumatic nail gun, the first cylinder and the second cylinder are connected via a connecting plate.

[0012] In the cylinder structure of the pneumatic nail gun, the connecting plate is annular or conical.

[0013] In the cylinder structure of the pneumatic nail gun described above, the first cylinder is provided with a mounting block, which is fixed to a mounting seat. The mounting block is also provided with a retaining ring, which is located within the mounting seat. The mounting seat is also provided with a buffer seat, which is located between the retaining ring and the mounting seat. The retaining ring located within the mounting seat makes it easier to install the first cylinder on the mounting seat and also serves to limit the buffer seat.

[0014] In the cylinder structure of the pneumatic nail gun described above, the nail gun further includes a housing, the housing being provided with an annular support plate, the support plate being located in front of the connecting plate. The support plate is located at the junction of the first and second cylinders. Positioning the support plate in front of the support plate provides better support for the cylinders and facilitates better positioning of the housing during installation.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. In this solution, the piston moves within the first cylinder. By installing a second cylinder behind the first, the volume of air chamber two is larger than that of air chamber one. Air chamber one can store more gas, thereby increasing the nailing force of the nail gun. Because the solution of installing the second cylinder behind the first cylinder is easier to manufacture than the solution of adding an additional elastic member, it can improve the nailing force of the nail gun while simplifying its structure. The length and diameter of the second cylinder can be adjusted appropriately to avoid the second cylinder being too long or too large in diameter, which would affect the use of the nail gun.

[0017] 2. In this solution, the first cylinder body and the second cylinder body are coaxially arranged to facilitate the processing of the nail gun, and the second cylinder body and the first cylinder body are integrated to ensure the sealing of the air chamber.

[0018] 3. The support plate is located at the junction of the first cylinder body and the second cylinder body. Placing the support plate on the front side of the support plate enables the support plate to better support the cylinder body and also better position the installation of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the pneumatic nail gun in the utility model;

[0020] Figure 2 This is a schematic diagram of the explosion structure of the pneumatic nail gun in the utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the pneumatic nail gun in the utility model;

[0022] Figure 4 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0023] Figure 5 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the pneumatic nail gun in the utility model;

[0025] Figure 7 This is a schematic diagram of the explosion structure of the lifting part of the pneumatic nail gun in the utility model;

[0026] Figure 8 This is a schematic structural diagram of the firing pin and piston of the pneumatic nail gun of the present invention;

[0027] Figure 9 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0028] Figure 10 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0029] Figure 11 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0030] Figure 12 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0031] Figure 13 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0032] Figure 14 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0033] Figure 15 This is a schematic cross-sectional view of the pneumatic nail gun of the present invention;

[0034] Figure 16 This is a schematic structural diagram of the second pawl of the pneumatic nail gun of the present invention;

[0035] Figure 17 This is a schematic diagram of the explosion structure of the second embodiment of the pneumatic nail gun in the present utility model;

[0036] Figure 18 This is a schematic structural diagram of a mounting base, a first cylinder body, and a second cylinder body of a second embodiment of a pneumatic nail gun of the present invention;

[0037] Figure 19 It is a structural schematic diagram of the first cylinder body and the second cylinder body of the second embodiment of the pneumatic nail gun of the present utility model.

[0038] In the figure, 1, impact part; 2a, first cylinder body; 2b, second cylinder body; 2c, connecting plate; 2d, mounting block; 2e, snap ring; 3, air chamber; 3a, air chamber 1; 3b, air chamber 2; 4, striker; 4a, protrusion; 4b, groove; 4c, connector; 4d, protrusion; 4e, fixing hole 2; 4f, guide strip; 5, piston; 5a, piston guide; 5b, piston seal; 6, buffer seat; 7, cylinder end cover; 8, installation seat; 8a, mounting plate; 8b, mounting cylinder; 8c, limiting cavity; 8d, boss; 9, nail extraction portion; 10, guide plate; 10a, mounting column; 10b, guide block; 11, lifting portion; 12, rotating disk; 12a, mounting hole; 12b, second ratchet; 12c, retaining ring; 12d, gear tooth 1; 12e, gear tooth 2; 13, rotating shaft; 14a, bearing 1; 14b, bearing 2; 15, cover plate; 16, bayonet; 17, Rotating member; 17a, fixed column; 18, separation column; 19, first pawl; 20, ring gear; 20a, limit block; 20b, first ratchet; 21, second pawl; 21a, separation member; 21b, separation portion; 21c, buffer portion; 22, first spring; 23, second spring; 24, first bearing; 26, speed reduction mechanism; 27, motor; 28, control system; 29, first position sensor; 30, second position sensor; 31. Third position sensor; 32. Trigger switch; 33. Nail magazine; 34. Control switch; 35. Nail ejector plate; 36. Safety switch; 37. Connector; 37a. Insert slot; 37b. Limit slot; 37c. Fixing hole 1; 38. Fixing pin; 39. Guide slot 1; 40. Housing; 40a. Support plate; 41. Handle; 42. Limit column; 43. Support column; 44. Washer; 45. Limit plate; 46. Guide slot 2. DETAILED DESCRIPTION

[0039] 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.

[0040] Example 1

[0041] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a pneumatic nail gun is primarily designed to drive nails into objects to be fastened with fasteners, such as furniture. The nail gun includes a housing 40, a handle 41, a striking portion 1, a lifting portion 11, a nail magazine 33, a nail ejection portion 9, a power supply, a control system 28, a motor 27, and a speed reduction mechanism 26.

[0042] The nail box 33 is arranged below the nail outlet portion 9. The nails are loaded in the nail box 33. The nails in the nail box 33 will enter the nail outlet portion 9. The nails in the nail outlet portion 9 will be replenished and enter the nail outlet portion 9 after being driven out by the nail pushing structure.

[0043] The nail gun includes a motor 27. The output shaft of motor 27 rotates in one direction when powered. A reduction mechanism 26 is connected to motor 27. The output shaft of reduction mechanism 26 is connected to rotating shaft 13 in lifting portion 11, driving rotation of rotating shaft 13. A battery is located below handle 41 to power motor 27 and a control system 28.

[0044] like Figure 2 、 Figure 3 and Figure 4 As shown, the impact part 1 of the nail gun is a structure that drives nails into the object to be fastened. The impact part 1 of the nail gun includes a first cylinder 2a and a second cylinder 2b. The first cylinder 2a and the second cylinder 2b are both hollow cylindrical. Specifically, the first cylinder 2a extends in the second direction to form the second cylinder 2b. A connecting plate 2c is formed between the first cylinder 2a and the second cylinder 2b. The connecting plate 2c has a conical shape.

[0045] The first cylinder body 2a and the second cylinder body 2b have the same wall thickness. In this embodiment, the wall thickness of the first cylinder body 2a and the second cylinder body 2b is 2.5 mm. The first cylinder body 2a and the second cylinder body 2b are connected and arranged coaxially. The second cylinder body 2a and the second cylinder body 2b are located behind the first cylinder body 2a. The second cylinder body 2b and the first cylinder body 2a do not overlap on their axes. The axis refers to the line A in the figure, which is an imaginary line representing the center line of the first cylinder body 2a and the second cylinder body 2b.

[0046] A cylinder end cap 7 is provided at one end of the second cylinder body 2b, sealing the end of the second cylinder body 2b. The cylinder end cap 7 and the piston 5 form an air chamber 3 for storing compressed fluid between the first cylinder body 2a and the second cylinder body 2b. Air chamber 3 can be filled with an inert gas, such as nitrogen or a rare gas, in addition to air.

[0047] The air chamber 3 includes an air chamber 2 3b located in the second cylinder 2b and an air chamber 1 3a located in the first cylinder 2a, wherein the air chamber 1 3a refers to the position when the piston 5 moves to the farthest position in the first direction in the first cylinder 2a. In this embodiment, the position is as follows: Figure 14 As shown, the piston 5 is at the bottom dead center of the first cylinder 2a. At this time, the piston 5 is in contact with the buffer seat 6. The air storage space formed between the rear end of the first cylinder and the position of the piston in the first cylinder at this time is the air chamber 3a.

[0048] The inner diameter of the second cylinder 2b is greater than that of the first cylinder 2a, and the volume of the second air chamber 3b is greater than that of the first air chamber 3a. The volume of the second air chamber 3b is at least 1.3 times, and preferably 1.8 times, that of the first air chamber 3a. In this embodiment, the volume of the second cylinder 2b is approximately 1.5 times greater than that of the first cylinder 2a. Specifically, the inner diameter of the first cylinder 2a is 50 mm, and the stroke of the piston 5 in the first cylinder 2a is 100 mm (i.e., the distance the piston 5 travels from top dead center to bottom dead center in the first cylinder is 100 mm). The inner diameter of the second cylinder 2b is 75 mm, and the length of the second cylinder 2b is 70 mm.

[0049] like Figure 2 As shown, an annular support plate 40 a is provided on the housing 40 , and the support plate 40 a is located on the front side of the connecting plate 2 c.

[0050] like Figure 4 As shown, a movable piston 5 is mounted on the inner wall of the first cylinder 2a. The piston 5 is cylindrical and has an annular piston seal 5b, an oil reservoir, and a piston guide 5a on its side. The piston guide 5a is located on either side of the piston seal 5b. The oil reservoir, which is not shown, is located between the piston seal 5b and the piston guide 5a and stores grease. The piston guide 5a is made of plastic and ensures smooth movement of the piston within the first cylinder 2a, preventing deviation and reducing friction between the piston 5 and the inner wall of the first cylinder 2a. The piston 5 reciprocates along line A within the first cylinder 2a. The piston seal 5b contacts the inner wall of the first cylinder 2a, forming a sealing surface between the piston 5 and the inner wall of the first cylinder 2a, preventing leakage of compressed gas within the air chamber 3. A magnet is located within the piston 5, which can be detected by a position sensor to determine the position of the piston 5 within the first cylinder 2a.

[0051] like Figure 4 、 Figure 6 and Figure 8 As shown, the striking part 1 also includes a striker 4 for pushing the nail to move. The striker 4 moves back and forth in the nail gun in a first direction F1 and a second direction F2 opposite to the first direction F1. When the striker 4 moves in the first direction F1, the nail gun realizes the nailing function. When the striker 4 moves in the second direction F2, the striker 4 resets, the gas in the air chamber 3 is compressed, and the piston 5 is subjected to high pressure.

[0052] like Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the striking part 1 further includes a striker 4 for pushing the nail to move and a lifting part 11 for driving the striker 4 to move.

[0053] like Figure 8As shown, the striker 4 is elongated, with a cylindrical front end for striking the nail. The striker 4 and piston 5 are fixed together by a flat connector 4c provided at one end of the striker 4. A connector 37 is threadedly connected to the piston 5. The connector 4c and connector 37 are connected by a fixing member 38. In this embodiment, the fixing member 38 is a fixing pin. Alternatively, the fixing member 38 may be a rivet. An arc-shaped protrusion 4d is provided in the middle position of the plug-in component 4c, and the connecting component 37 is provided with a plug-in groove 37a and a limit groove 37b. The plug-in component 4c is located in the plug-in groove 37a and the protrusion 4d is located in the limit groove 37b. The plug-in component 4c is also provided with a second fixing hole 4e, and the second fixing hole 4e passes through the protrusion 4d. The connecting component 37 is also provided with a first fixing hole 37c, and the first fixing hole 37c is connected to the limit groove 37b. When the striker 4 and the connecting component 37 are connected, the first fixing hole 37c and the second fixing hole 4e are aligned, and the fixing component 38 is located in the first fixing hole 37c and the second fixing hole 4e.

[0054] Arc-shaped guide strips 4f are also provided on the upper and lower sides of the firing pin 4. In this embodiment, the guide strip 4f and the protrusion 4d are integrated. The nail-out portion 9 includes a guide plate 10 and a nail-out plate 35. A limiting plate 45 is further provided under the guide plate 10. The limiting plate 45, the guide plate 10 and the nail-out plate 35 are all provided with a guide groove 39 that cooperates with the guide strip 4f.

[0055] Multiple protrusions 4a are distributed along one side of the striker 4 to help lift it. These protrusions 4a extend outward along the width of the striker 4. In this embodiment, there are nine protrusions 4a, with spacing between adjacent protrusions 4a forming a groove 4b. A second guide groove 46 is formed between each protrusion 4a and the main body of the striker 4. The guide plate 10 is also provided with a guide block 10b that slides within the second guide groove 46.

[0056] like Figure 1 、 Figure 5 and Figure 8 As shown, the other end of the first cylinder body 2a is fixed on the mounting base 8, and specifically an exhaust hole is provided on the mounting base 8, and the striker 4 can pass through the exhaust hole. A buffer seat 6 is also provided on the mounting base 8, and the buffer seat 6 is located between the mounting base 8 and the first cylinder body 2a.

[0057] like Figure 5 Combine Figure 15 As shown, a mounting plate 8a is provided at the front end of the mounting base 8, and a nail output portion 9 is provided below the mounting plate 8a. The nail output portion 9 includes a guide plate 10 fixed below the mounting plate 8a and a nail output plate 35 located below the guide plate 10. The nail magazine 33 is fixed to the nail output plate 35. In the mounting base 8, a mounting cylinder 8b is further provided on the side of the mounting plate 8a. The mounting cylinder 8b is provided with a lifting portion 11 that drives the striker 4 to move.

[0058] like Figure 4 Combine Figure 5 and Figure 7 As shown, the lifting portion 11 includes a rotating shaft 13. Two bearings, bearing 14a and bearing 2 14b, are vertically disposed within the mounting tube 8b. The lower bearing 14b is mounted in a mounting groove within the mounting tube 8b. A cover plate 15 is fixedly connected to the mounting tube 8b. The cover plate 15 also has a mounting groove disposed therein. The upper bearing 14a is located within the mounting groove within the cover plate 15. The rotating shaft 13 is mounted at both ends on the two bearings and rotates around its axis B. The lower end of the rotating shaft 13 is connected to a reduction mechanism 26, which has a racetrack-shaped hole disposed therein. The lower portion of the rotating shaft 13 corresponds to and is inserted into the racetrack-shaped hole, thereby driving the rotating shaft 13 in rotation.

[0059] like Figure 4 Combine Figure 5 and Figure 7 As shown, the lifting part 11 also includes a rotating disk 12 arranged on the rotating shaft 13. The rotating disk 12 has a plurality of mounting holes 12a arranged along the rotation direction. The mounting holes 12a are annular and are continuously spaced apart on the rotating disk 12. A bayonet 16 is provided in each mounting hole 12a. The bayonet 16 is annular and is continuously spaced apart on the rotating disk 12. The bayonet 16 is cylindrical, and a limiting plate is provided below the bayonet on the rotating disk 12. The limiting plate prevents the bayonet 16 from falling out of the mounting hole 12a. The bayonet 16 can rotate along its center in the mounting hole 12a but cannot move in the radial direction of the rotating disk 12. During the lifting process of the striker 4, the bayonet 16 is located in the groove 4b, and the bayonet 16 abuts against the corresponding protrusion 4a. The bayonet 16 can rotate around its center, which can reduce the wear between the bayonet 16 and the protrusion 4a. A second ratchet wheel 12 b is provided at the upper end of the rotating disk 12 . A circle of gear teeth is evenly distributed on the second ratchet wheel 12 b . The gear teeth of the second ratchet wheel 12 b face outward along the center of the rotating disk 12 .

[0060] like Figure 10 As shown, from a top view, in this embodiment, the motor 27 drives the rotating disk 12 to rotate counterclockwise.

[0061] like Figure 4As shown, a first bearing 24 is sleeved on the rotating shaft 13. The first bearing 24 and the rotating shaft 13 are axially fixed. The first bearing 24 is located between the rotating disk 12 and the rotating shaft 13 and is located on the inner side of the rotating disk 12. In this embodiment, the upper end of the first bearing 24 abuts against the inner end surface of the rotating disk 12. The rotating disk 12 is also provided with a limiting member for limiting the first bearing 24 in the rotating disk 12. The limiting member is a clamp embedded in the inner wall of the rotating disk 12. A retaining ring 12c is provided on the rotating disk 12, and the first bearing 24 is located above the retaining ring 12c. A support column 43 is also provided between the first bearing 24 and the second bearing 14b.

[0062] like Figure 6 and Figure 7 As shown, a rotating member 17 is fixed to the rotating shaft 13 via threads. The rotating member 17 is flat and has a first pawl 19 rotatably mounted on the rotating member 17. The first pawl 19 is mounted on the rotating member 17 via a connecting column. A first spring 22 is disposed between the first pawl 19 and the rotating member 17. One end of the first spring 22 is mounted on the rotating member 17, and the other end of the first spring 22 is mounted on the first pawl 19. A washer 44 is disposed between the first pawl 19 and the rotating member 17. A boss 8d is provided on the inner sidewall of the mounting tube 8b. The boss 8d is provided with a ring gear 20 that cooperates with the first pawl 19. The inner side surface of the ring gear 20 is provided with a first ratchet tooth 20b. The first pawl 19 is located inside the ring gear 20 and engages with the first ratchet tooth 20b to limit the rotation of the rotating shaft 13. A limiting cavity 8c is also provided on the mounting base 8. A limiting block 20a is disposed on the ring gear 20 and is located within the limiting cavity 8c.

[0063] The lifting assembly includes a second ratchet 12b mounted on the rotating disk 12 and a second pawl 21 mounted on the rotating member 17. The second ratchet 12b is positioned in the center of the rotating disk 12 and below the rotating member 17. The second pawl 21 meshes with the teeth of the second ratchet 12b. In this embodiment, the meshing of the second pawl 21 with tooth 12d is used as an example. The second pawl 21 is also provided with a separating member 21a for separating the second pawl 21 from the second ratchet 12b. A separating post 18 is positioned within the limiting cavity 8c, engaging with the separating member 21a. A portion of the separating post 18 is positioned within the mounting tube 8b. When the separating member 21a abuts against the separating post 18, the second pawl 21 separates from the second ratchet 12b.

[0064] The first pawl 19 and the second pawl 21 are arranged opposite each other. The first ratchet teeth 20b are one-way teeth, and the teeth of the second ratchet face outward along the center of the rotating disk 12. A fixed post 17a is provided on the rotating member 17, and the second pawl 21 is rotatably mounted on the fixed post 17a. A second spring 23 is provided between the second pawl 21 and the rotating member 17. One end of the second spring 23 is mounted on the rotating member 17, and the other end of the second spring 23 is mounted inside the separating member 21a. The guide plate 10 is provided with a mounting post 10a located within the limiting cavity 8c. The separating member 18 is mounted on the mounting post 10a and is located below the limiting block 20a. A limiting post 42 is also mounted on the mounting post 10a and is located between the separating member 18 and the limiting block 20a. The limiting post 42 abuts against the separating member 18. The limiting block 20a and the separating member 18 jointly limit the separating member 18 to prevent it from moving upward.

[0065] like Figure 16 As shown, the projection of the outer end surface of the release member 21a on a horizontal plane is a linear buffer portion 21c and an arcuate release portion 21b. When the striker 4 moves in the second direction F2, the second pawl 21 and the second ratchet 12b engage, and the release member 21a and the release post 18 are no longer in contact. When the striker 4 moves in the first direction, the release portion 21b of the release member 21a contacts the release post 18, the pawl rotates about the connecting axis, and the second pawl 21 disengages from the second ratchet 12b.

[0066] The striker 4 moves with the piston 5 , and the piston 5 has three positions in the first cylinder 2 a , including a top dead center, a bottom dead center, and a locking point.

[0067] like Figure 5 As shown, a first sensor 29, a second sensor 30 and a third sensor 31 are provided on the housing 40 of the nail gun and on the outside of the first cylinder 2a, wherein the first sensor 29 is used to detect whether the piston 5 moves to the locking point. Figure 8 and Figure 9As shown, the piston 5 is at the locking point within the first cylinder 2a. At this time, the first sensor 29 detects that the piston 5 has moved to the locking point, and the control system 28 controls the motor 27 to stop. The first pawl 19 engages with the first ratchet tooth 20b on the ring gear 20, the rotating member 17 stops rotating, and the rotating shaft 13 stops rotating. Because the second pawl 21 engages with the tooth 12d on the second ratchet wheel 12b, in this example, the second pawl 21 and the rotating disk 12 stop rotating. The latch 16 on the rotating disk 12 engages with the protrusion 4a on the striker 4, and the striker remains locked. When the motor 29 stops, the piston 5 may move downward from the locking point for a distance because the first pawl 19 and the first ratchet tooth 20b may not have yet engaged. Under the action of the high-pressure gas in the air chamber 3, the piston 5 moves a distance in the direction F1 until the first pawl 19 and the first ratchet tooth 20b engage, and the piston 5 stops moving. If the first pawl 19 and the first ratchet tooth 20 b are just engaged when the piston 5 is at the locking point, the piston 5 will not move in the first direction F1 .

[0068] like Figure 13 and Figure 14 As shown, the piston is at its bottom dead center within the first cylinder 2a. After the nail gun fires a nail, the piston 5 moves to its bottom dead center under the action of the high-pressure gas. The control system 28 controls the motor 27 to continue rotating. The motor 27 drives the rotating shaft 13 through the reduction mechanism 26. The rotating member 17 on the rotating shaft 13 rotates with the rotating shaft 13 and drives the second pawl 21 to move. At this time, the separating member 21a is separated from the separating column 18, and the second pawl 21 rotates under the action of the second spring 23, engaging the second pawl 21 with the gear teeth 12d on the second ratchet 12b. When the nail gun is operating normally, the position where the second pawl 21 engages with the gear teeth on the second ratchet 12b corresponds to the position where the latch 16 on the rotating disk 12 engages the protrusion 4a on the striker 4.

[0069] like Figure 1 Combine Figure 9 and Figure 14 As shown, it is the top dead center of the piston 5 in the first cylinder 2a, and the projection of the outer end surface of the separator 21a on the horizontal plane is the arc-shaped separation portion 21b against the separation column 18. The separator 21a drives the second pawl 21 to rotate, so that the second pawl 21 and the second ratchet 12b are separated, and the rotating shaft 13 and the rotating disk 12 are no longer combined with each other. The piston 5 is affected by the high-pressure gas in the air chamber 3, driving the striker 4 to move in the first direction, and the striker 4 drives the rotating disk 12 to rotate, and the striker 4 realizes nailing.

[0070] The third sensor 31 and the second sensor 30 are located between the locking point and the bottom dead center. The distance from the third position sensor 31 to the bottom dead center must be smaller than the distance from the third position sensor 31 to the locking point. They are used to detect whether the nail gun is stuck. The distance from the third sensor 31 to the bottom dead center can be set to half the length of a nail. If the third position sensor 31 does not detect the piston 5 during a nailing process, it indicates that the nail gun is stuck. The distance from the second position sensor 30 to the locking point must be smaller than the distance from the second position sensor 30 to the bottom dead center. The function of the second position sensor is described in the working principle.

[0071] like Figure 1 As shown, the power supply unit has a storage housing and a plurality of battery cells housed in the storage housing. The nail gun also includes a safety switch 36, a control switch 34, and a trigger switch 32. When the control switch 34 is pressed, the control system 28 of the nail gun can start working. The trigger switch 32 and the control switch 34 are both set on the handle. The trigger switch 32 detects the presence or absence of operating force applied to the handle. The trigger switch 32 is connected to the control system 28 and outputs a signal corresponding to the detection result. The safety switch 36 is also connected to the control system 28. When the nail gun is in use, the safety switch 36 is pressed against the object, and when the trigger switch 32 is turned on, the nail gun can achieve nailing.

[0072] The working principle of the nail gun is as follows: Figure 13 and Figure 14 As shown, when the nail gun is not turned on, the piston 5 is at the bottom dead center, so that the gas in the air chamber is not in a compressed state, thereby improving the safety of the nail gun; Figure 9 and Figure 10 As shown, when the nail gun is turned on and the gun control switch 34 is turned on, the motor 27 works, and the motor 27 drives the rotating shaft 13 to rotate through the reduction mechanism 26. Since the second pawl 21 is engaged with the gear tooth 12d, the rotating shaft 13 drives the rotating disk 12 to rotate, and the latch 16 on the rotating disk 12 abuts against the protrusion 4a of the striker 4 to lift the striker 4, and the piston 5 moves from the bottom dead center to the locking point. The projection of the outer end surface of the separator 21a on the horizontal plane is the buffer portion 21c and the separator column 18. At this time, the second pawl 21 is still engaged with the gear tooth 12d; as shown in FIG. Figure 11 and Figure 12As shown, when the nail gun is turned on and the safety switch 36 and the trigger switch 32 are both turned on, the motor 27 drives the rotary disk 12 to rotate through the reduction mechanism 26. When the piston 5 moves from the locking point to the top dead center, when the piston 5 moves to the top dead center, the outer end surface of the separator 21a is projected on the horizontal plane as an arc separation portion 21b and contacts the separation column 18, and the separator 21a rotates toward the center of the rotary disk 12. The second pawl 21 rotates away from the center of the rotary disk 12 and disengages from the gear tooth 12d. The rotary disk 12 is separated from the rotating shaft 13, and the second spring 23 is in a compressed state. The piston 5 is acted upon by the high-pressure gas in the air chamber 3 and moves from the top dead center to the first direction. The front end of the striker 4 strikes the nail to achieve nailing. In this process, the striker 4 drives the rotary disk 12 to rotate together but does not drive the rotating shaft 13 to rotate. Figure 7 As shown, from a top-down perspective, the striker 4 drives the rotating disk 12 to rotate clockwise. During the process of the piston 5 moving from the top dead center to the bottom dead center, the second position sensor 30 detects the piston 5 once. After the nailing is completed, the piston 5 reaches the bottom dead center. When the piston 5 moves to the bottom dead center, the separator 21a disengages from the separation column 18, and the second pawl 21 moves toward the center of the rotating disk 12 under the action of the second spring 23 and re-engages with the second ratchet 12b. The gear teeth on the second ratchet 12b that engage with the second pawl 21 when the piston 5 moves to the bottom dead center are also the gear teeth on the second ratchet 12b that engage with the second pawl 21 when the piston 5 is at the locking point, that is, gear tooth 12d. Because when the piston 5 is at the bottom dead center, the pin 16 on the rotating disk 12 and the protrusion 4a on the firing pin 4 correspond to each other, and when the piston 5 moves from the bottom dead center to the locking point, the second pawl 21 remains engaged with the gear teeth on the second ratchet 12b. In order to enable the nail gun to repeatedly nail, the gear teeth on the second ratchet 12b that engage with the second pawl 21 when the piston 5 moves to the bottom dead center are also the gear teeth on the second ratchet 12b that engage with the second pawl 21 when the piston 5 is at the locking point. After nailing is completed, the motor 27 continues to rotate and drives the rotating shaft 13 to rotate through the reduction mechanism 26. The rotating shaft 13 drives the rotating disk 12 to rotate, and the rotating disk 12 drives the striker 4 to move in the second direction. During this process, the piston 5 will be detected by the second position sensor for the second time. At this time, the motor 27 continues to rotate and will not stop until the piston 5 moves to the locking point. The motor 27 is powered off. Since the first pawl 19 is engaged with the first ratchet, and the rotating disk 12 and the rotating shaft 13 are in a combined state, the rotating shaft 13 does not rotate in the opposite direction. The rotating shaft 13 fixes the rotating disk 12 and locks the striker 4, completing a nailing cycle.

[0073] During the nailing process, the piston 5 is not detected by the third position sensor 31, and the piston 5 has returned to the locking point, which indicates that the piston 5 and the firing pin 4 have not been driven down and the nail is stuck. Then the red light of the nail gun flashes to remind you to deal with the jammed nail. After the jam is dealt with, since the piston 5 has not reached the bottom dead center, the teeth on the second pawl 21 and the second ratchet 12b are misaligned, and the second pawl 21 and other teeth on the second ratchet 12b are engaged, such as the tooth 2 12e in the figure. The piston 5 does not need to reach the top dead center. The second pawl 21 will rotate under the action of the separation column 18, and the second pawl 21 and the second ratchet 12b are disengaged again. The piston 5 moves in the first direction under the action of the high-pressure gas. At this time, since there is no jammed nail, the piston 5 will reach the bottom dead center. After the separation piece 21a and the separation column 18 are disengaged, the second pawl 21 and the second ratchet 12b are re-engaged. At this time, the second pawl 21 is re-engaged with the tooth 1 12d on the second ratchet 12b, and the nail gun resumes normal operation.

[0074] Example 2

[0075] like Figure 17 、 Figure 18 and Figure 19 As shown, the structures of this embodiment and the first embodiment are basically the same, and the only difference is that the shape of the connecting plate 2c between the first cylinder body 2a and the second cylinder body 2b is slightly different. In this embodiment, the shape of the connecting plate 2c is annular.

[0076] A mounting block 2d is provided on the first cylinder body 2a, and the mounting block 2d is fixed to the mounting seat 8 by bolts. A retaining ring 2e is also provided on the mounting block 2d, and the retaining ring 2e is located in the mounting seat 8. A buffer seat 6 is also provided in the mounting seat 8, and the buffer seat 6 is located between the retaining ring 2e and the mounting seat 8. This structure is also included in Example 1.

[0077] 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.

[0078] Although this document frequently uses terms such as 1. impact part; 2a. first cylinder body; 2b. second cylinder body; 2c. connecting plate; 2d. mounting block; 2e. snap ring; 3. air chamber; 4. striker; 4a. protrusion; 4b. groove; 4c. connector; 4d. projection; 4e. second fixing hole; 4f. guide strip; 5. piston; 5a. piston guide; 5b. piston seal; 6. buffer seat; 7. cylinder end cover, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A cylinder structure of a pneumatic nail gun, comprising a nail-extracting portion (9) and a striking portion (1) for driving a nail in the nail-extracting portion (9) out of the nail gun along a first direction, wherein the striking portion (1) comprises a piston (5) and a striker (4) disposed on the piston (5), wherein the piston (5) moves in a first cylinder (2a) and drives the striker (4) to reciprocate in a first direction and a second direction opposite to the ... The first cylinder (2a) extends in a second direction to form a second cylinder (2b). The first cylinder (2a) and the second cylinder (2b) are both hollow cylindrical. The first cylinder (2a) and the second cylinder (2b) are coaxially arranged and the second cylinder (2b) is located at the rear side of the first cylinder (2a). The second cylinder (2b) and the first cylinder (2a) are connected. The piston (5) forms an air chamber (3) with the first cylinder (2a) and the second cylinder (2b). The air chamber (3) includes an air chamber 1 (3a) located in the first cylinder and an air chamber 2 (3b) located in the second cylinder (2b). The inner diameter of the second cylinder (2b) is larger than the inner diameter of the first cylinder (2a).

2. The cylinder structure of a nail gun according to claim 1, characterized in that: The volume of the second air chamber (3b) is at least 1.3 times the volume of the first air chamber (3a).

3. The cylinder structure of a nail gun according to claim 2, characterized in that: The volume of the second air chamber (3b) is 1.8 times the volume of the first air chamber (3a).

4. The cylinder structure of a nail gun according to claim 3, characterized in that: The wall thicknesses of the first cylinder body (2a) and the second cylinder body (2b) are the same.

5. The cylinder structure of a nail gun according to claim 4, characterized in that: The wall thickness of the first cylinder body (2a) and the second cylinder body (2b) are both 2.5 mm.

6. The cylinder structure of a nail gun according to claim 2, 3, 4 or 5, characterized in that: A connecting plate (2c) is formed between the first cylinder body (2a) and the second cylinder body (2b).

7. The cylinder structure of a nail gun according to claim 6, characterized in that: The connecting plate (2c) is annular or conical.

8. The cylinder structure of a nail gun according to claim 7, characterized in that: The first cylinder body (2a) is provided with a mounting block (2d), the mounting block (2d) is fixed on the mounting seat (8), the mounting block (2d) is also provided with a snap ring (2e), the snap ring (2e) is located in the mounting seat (8), the mounting seat (8) is also provided with a buffer seat (6), and the buffer seat (6) is located between the snap ring (2e) and the mounting seat (8).

9. The cylinder structure of a nail gun according to claim 8, characterized in that: The nail gun further comprises a housing (40), and an annular support plate (40a) is provided on the housing (40), and the support plate (40a) is located on the front side of the connecting plate (2c).

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