A locking device for firing pin of electric nail gun

Abstract

A locking device for an electric nail gun striker comprises a gear box, a connector, an upper cylinder, a lower cylinder, a cylinder seat, and a cylinder cover. The left side wall of the connector is provided with a striker hole that intersects with the upper cylinder. An upper piston is provided in the upper cylinder. A striker is provided at the center of the left side wall of the upper piston. The left end of the striker passes through the striker hole to the left. A lower piston is provided in the lower cylinder. An eccentric shaft seat is provided in the gear box. An eccentric shaft is provided on one side of the eccentric shaft seat. A piston arm is hinged at the center of the left side wall of the lower piston. One end of the piston arm is hinged on the eccentric shaft. A fixing hole and a positioning hole corresponding to the position of the fixing hole are provided on the left side of the upper surface of the gear box. The locking device for the electric nail gun striker of the present invention can not only automatically open the positioning plate when the air pressure inside the nail gun is sufficient to achieve the effect of automatic nailing, but also can effectively avoid the position deviation of the positioning plate during the lifting process, and ensure that the positioning plate can be quickly and accurately reset.

Description

Technical Field

[0001] The invention relates to a locking device, in particular to a locking device for a firing pin of an electric nail gun. Background Art

[0002] When the electric nail gun is not in use, the firing pin assembly will be locked by the positioning plate. When in use, the air pressure in the cylinder will continue to increase. At this time, the staff only needs to use external force to pull the positioning plate out of the firing pin assembly, and then the increased air pressure can be used to push the firing pin out, thereby driving the nail out through the firing pin. However, this nailing method cannot achieve automatic nailing. Each time the air pressure is sufficient, the staff needs to actively open the positioning plate, which is extremely troublesome and seriously affects the nailing efficiency. During the lifting process of the positioning plate, there is no restricting structure so that it can only move in the longitudinal direction. Therefore, in the process of opening the positioning plate, The angle of the positioning plate is very easy to deviate, resulting in the positioning plate being unable to reset quickly, affecting the locking efficiency of the firing pin assembly after the electric nail gun finishes nailing, thereby affecting the efficiency of the next nailing. In addition, traditional electric nail guns are limited by their own structure and cannot change the air pressure during nailing. Therefore, the air pressure generated during nailing is constant, resulting in a constant nailing force. However, in actual use or nailing testing, nails will need to be driven to different depths. When the nailing force remains unchanged, only the same nailing depth can be achieved, which cannot adapt to other nailing requirements and has serious limitations. Summary of the invention

[0003] The present invention aims to solve the existing technical problem by providing a locking device for the firing pin of an electric nail gun, which can not only automatically open the positioning plate when the air pressure inside the nail gun is sufficient to achieve the effect of automatic nailing, but also effectively avoid the position deviation of the positioning plate during the lifting process, ensuring that the positioning plate can be quickly and accurately reset, and can also adjust the air pressure inside the nail gun so that the nail can be driven to different depths after being driven out, thereby adapting to more nailing requirements.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] The present invention discloses a locking device for a firing pin of an electric nail gun, comprising a gear box, a connecting head, an upper cylinder, a lower cylinder, a cylinder seat and a cylinder cover, wherein a firing pin hole which is intersected with the upper cylinder is provided on the left side wall of the connecting head, an upper piston is provided in the upper cylinder, a firing pin is provided at the center of the left side wall of the upper piston, the left end of the firing pin passes through the firing pin hole to the left, a lower piston is provided in the lower cylinder, an eccentric shaft seat is provided in the gear box, an eccentric shaft is provided on one side of the eccentric shaft seat, a piston arm is hingedly connected to the center of the left side wall of the lower piston, and one end of the piston arm is hingedly connected to the eccentric shaft, and the characteristic is that: a fixing hole and a positioning hole corresponding to the position of the fixing hole are provided on the left side of the upper surface of the gear box; a positioning screw matching therewith is installed in the positioning hole; the lower end of the positioning screw penetrates downwardly into the internal space of the gear box and is hingedly connected to a rocking arm; a reset structure matching the gear box is provided on the rocking arm; a pressing plate corresponding to the position of the eccentric shaft is provided on the front side of the right end of the rocking arm; an extension arm is provided on the rear side of the middle of the rocking arm; A plane guide plate is provided at the end of the extension arm; the plane guide plate is provided with an inclined guide plate inclined toward the lower left, and the extension arm, the plane guide plate and the inclined guide plate are combined to form a C-shaped structure; a fixing tube matching it is provided in the fixing hole, and the lower end of the fixing tube is pressed into the internal space of the gear box, and the fixing tube is tightly fixed to the fixing hole; a lifting rod is provided in the fixing tube; the upper end of the lifting rod passes through the fixing tube and is provided with a positioning piece; the front side of the right part of the positioning piece is provided with a number of evenly distributed positioning teeth; the side of the striker opposite to the positioning piece is provided with a number of positioning grooves matching the positioning teeth; the upper end of the positioning screw is provided with a guide structure matching the positioning piece; the lower end of the lifting rod passes through the fixing tube downward and is provided with a pressure regulating plate; the pressure regulating plate is provided with a pressure regulating structure; the pressure regulating structure includes a point contact corresponding to the position of the inclined guide plate; a lifting spring sleeved on the outside of the lifting rod is provided between the pressure regulating plate and the lower end surface of the fixing tube.

[0006] The voltage regulating structure includes a first screw hole arranged on the right part of the voltage regulating plate, and the point contact is screwed into the first screw hole; a slot is arranged on the upper end of the point contact, and the lower end of the point contact is spherical; a fastening nut is screwed outside the point contact and fits the upper surface of the voltage regulating plate.

[0007] A ball-shaped embedding groove is arranged at the lower end of the point contact; a ball matched with the ball-shaped embedding groove is arranged in the ball-shaped embedding groove, and one end of the ball-shaped embedding groove protrudes out of the ball-shaped embedding groove.

[0008] A guide surface inclined forward and right is provided on the rear side of the right part of the positioning plate; the guide structure includes a limit plate screwed to the upper end of the positioning screw, and the limit plate is located above the striker; there is a movable gap between the lower surface of the limit plate and the upper surface of the positioning plate, and the movable gap is greater than the thickness of the positioning plate; a rear guide plate that fits with the guide surface is provided on the side of the outer wall of the gear box opposite to the limit plate, and a front guide plate that fits with the front side wall of the positioning tooth is provided at one end of the limit plate; the lower end surface of the front guide plate fits with the upper surface of the striker; a pad located on the lower surface of the striker is provided on the upper part of the positioning screw, and a guide sleeve that fits with the side wall of the striker is provided on the upper surface of the pad plate.

[0009] The reset structure includes a second screw hole arranged in the middle of the rocker, and a fixing bolt is screwed into the second screw hole; the head of the fixing bolt is located above the rocker, and the head of the fixing bolt is covered with a buffer sleeve, and the buffer sleeve is made of rubber; the diameter of the buffer sleeve is larger than the width of the rocker; the fixing bolt is connected to the inner wall of the gear box by a tension spring.

[0010] The positioning teeth and the positioning groove are both narrow at the bottom and wide at the top, the outer wall of the positioning teeth and the inner wall of the positioning groove are both inclined surfaces, and the outer wall of the positioning teeth fits the inner wall of the positioning groove.

[0011] A buffer hole that is connected to the striker hole is provided on the left side of the connecting head, and the left end of the upper cylinder is connected to the right end of the buffer hole; an annular buffer pad is provided in the buffer hole, and the buffer pad is made of rubber; a rib groove is provided on the lower inner wall of the buffer hole; a positioning rib matching the rib groove is provided on the lower surface of the buffer pad, and the positioning rib is embedded in the rib groove; a notch is provided on the upper right side wall of the buffer pad.

[0012] The positioning piece and the pressure regulating plate are both provided with a waist-shaped hole; the upper and lower ends of the lifting rod are both provided with clamps matching the waist-shaped holes, and the upper clamp and the positioning piece, and the lower clamp and the pressure regulating plate are fixed by screws.

[0013] A positioning seat is provided below the rocker and is installed in the rocker hinge hole, and the lower end of the positioning screw passes through the positioning seat; a fixing nut is provided at the lower end of the positioning seat and is tightened and fixed with the lower end of the positioning screw.

[0014] The beneficial effects of the present invention are:

[0015] Compared with the prior art, the locking device of the firing pin of the electric nail gun adopting the structure of the present invention can utilize the rotation of the eccentric shaft to drive the lower piston to move and the rocker to rotate at the same time. When the lower piston moves, the pressurized gas acts on the upper piston and pushes it. When the rocker rotates, the positioning piece will drive the positioning tooth to disengage from the positioning groove on the firing pin. When the positioning tooth is completely disengaged from the positioning groove, the upper piston will drive the firing pin to knock out the nail, thereby achieving an automatic nailing effect. There is no need to manually release the restriction of the positioning piece on the firing pin, which reduces the trouble in the nailing process and effectively improves the nailing efficiency. During the process of disengaging from the positioning groove on the firing pin, the guide structure always guides the positioning piece so that the positioning piece can only move up and down, and its angle will not change. This can effectively avoid the position deviation of the positioning piece during the lifting process, and ensure that the positioning piece can be quickly and accurately reset. The air pressure inside the nail gun can also be adjusted through the pressure regulating structure, so that the upper piston can drive the firing pin to drive the nail under the action of different air pressures. When the force applied by the firing pin on the nail is different, different depths can be driven, thereby achieving the effect of adjustable nailing depth, thereby being able to adapt to more nailing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a locking device for a firing pin of an electric nail gun of the present invention;

[0017] Figure 2 It is a partial structural schematic diagram of the locking device of the firing pin of the electric nail gun of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure when the point contact is provided with a ball;

[0019] Figure 4 is a cross-sectional view of a locking device for a firing pin of an electric nail gun of the present invention;

[0020] Figure 5 It is a top view of the locking device of the firing pin of the electric nail gun of the present invention;

[0021] Figure 6 A partial rear view of the locking device of the firing pin of the electric nail gun of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure when the lifting rod, positioning plate and pressure regulating plate are assembled.

[0023] Figure 8 It is a side cross-sectional view of the locating teeth and locating grooves when assembled. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] See also Figures 1 to 8 The present invention provides a locking device for a firing pin of an electric nail gun, comprising a gear box 1, a connector 2, an upper cylinder 3, a lower cylinder 4, a cylinder seat 5, and a cylinder cover 6. A firing pin hole 7 which is in communication with the upper cylinder 3 is provided on the left side wall of the connector 2. An upper piston 8 is provided in the upper cylinder 3. A firing pin 9 is provided at the center of the left side wall of the upper piston 8. The left end of the firing pin 9 passes through the firing pin hole 7 to the left. A lower piston 10 is provided in the lower cylinder 4. An eccentric shaft seat 11 is provided in the gear box 1. An eccentric shaft 12 is provided on one side of the eccentric shaft seat 11. A piston arm 13 is hinged at the center of the left side wall of the lower piston 10. The piston One end of the arm 13 is hinged on the eccentric shaft 12. A fixing hole 14 and a positioning hole 15 corresponding to the position of the fixing hole 14 are provided on the left side of the upper surface of the gear box 1; a positioning screw 16 matching therewith is installed in the positioning hole 15; the lower end of the positioning screw 16 penetrates downward into the internal space of the gear box 1 and is hinged with a rocker 17; a reset structure matching the gear box 1 is provided on the rocker 17; a pressure plate 18 corresponding to the position of the eccentric shaft 12 is provided on the front side of the right end of the rocker 17; an extension arm 19 is provided on the rear side of the middle part of the rocker 17; the extension arm A plane guide plate 20 is provided at the end of 19; the plane guide plate 20 is provided with an inclined plane guide plate 21 inclined to the lower left, and the extension arm 19, the plane guide plate 20 and the inclined plane guide plate 21 are enclosed to form a C-shaped structure; a matching fixing tube 22 is provided in the fixing hole 14, and the lower end of the fixing tube 22 is pressed into the internal space of the gear box 1, and the fixing tube is tightly fixed to the fixing hole; a lifting rod 23 is provided in the fixing tube 22; the upper end of the lifting rod 23 passes through the fixing tube 22 and is provided with a positioning piece 24; the front side of the right part of the positioning piece 24 is provided with The positioning teeth 25 are evenly distributed on the stem; a plurality of positioning grooves 26 matching the positioning teeth 25 are provided on the side of the striker 9 opposite to the positioning piece 24; a guide structure matching the positioning piece 24 is provided at the upper end of the positioning screw 16; the lower end of the lifting rod 23 passes through the fixed tube 22 downward and is provided with a pressure regulating plate 18; the pressure regulating plate 18 is provided with a pressure regulating structure; the pressure regulating structure includes a point contact 27 corresponding to the position of the inclined guide plate 21; a lifting spring 28 is provided between the pressure regulating plate 18 and the lower end surface of the fixed tube 22 and is sleeved on the outside of the lifting rod 23.

[0026] The voltage regulating structure includes a first screw hole 29 arranged on the right part of the voltage regulating plate 18, and the point contact 27 is screwed into the first screw hole 29; a straight groove 30 is arranged on the upper end of the point contact 27, and the lower end of the point contact 27 is spherical; the point contact 27 is externally screwed with a fastening nut 31 that fits with the upper surface of the voltage regulating plate 18.

[0027] A ball-shaped embedding groove 32 is disposed at the lower end of the point contact 27 ; a ball 33 matching the ball 33 is disposed in the ball-shaped embedding groove 32 , and one end of the ball 33 protrudes out of the ball-shaped embedding groove 32 .

[0028] A guide surface 34 inclined forward and rightward is provided on the rear side of the right part of the positioning piece 24; the guide structure includes a limit plate 35 screwed to the upper end of the positioning screw 16, and the limit plate 35 is located above the striker 9; there is a movable gap between the lower surface of the limit plate 35 and the upper surface of the positioning piece 24, and the movable gap is greater than the thickness of the positioning piece 24; a rear guide plate 36 that fits with the guide surface is provided on the side of the outer wall of the gear box 1 opposite to the limit plate 35, and a front guide plate 37 that fits with the front side wall of the positioning tooth 25 is provided at one end of the limit plate 35; the lower end surface of the front guide plate 37 fits with the upper surface of the striker 9; a pad 38 located on the lower surface of the striker 9 is provided on the upper part of the positioning screw 16, and a guide sleeve 3801 that fits with the side wall of the striker 9 is provided on the upper surface of the pad 38.

[0029] The reset structure includes a second screw hole 39 arranged in the middle of the rocker 17, and a fixing bolt 40 is screwed into the second screw hole 39; the head of the fixing bolt 40 is located above the rocker 17, and the head of the fixing bolt 40 is covered with a buffer sleeve 41, and the buffer sleeve 41 is made of rubber; the diameter of the buffer sleeve 41 is greater than the width of the rocker 17; the fixing bolt 40 is connected to the inner wall of the gear box 1 through a tension spring 42.

[0030] The positioning teeth 25 and the positioning grooves 26 are both narrow at the bottom and wide at the top. The outer wall of the positioning teeth 25 and the inner wall of the positioning grooves 26 are both inclined surfaces, and the outer wall of the positioning teeth 25 and the inner wall of the positioning grooves 26 fit together.

[0031] A buffer hole 43 that is connected to the striker hole 7 is provided on the left side of the connecting head 2, and the left end of the upper cylinder 3 is connected to the right end of the buffer hole 43; a ring-shaped buffer pad 44 is provided in the buffer hole 43, and the buffer pad 44 is made of rubber; a rib groove 4301 is provided on the lower inner wall of the buffer hole 43; a positioning rib 4401 matching the rib groove 4301 is provided on the lower surface of the buffer pad 44, and the positioning rib 4401 is embedded in the rib groove 4301; a notch 4402 is provided on the upper right side wall of the buffer pad 44.

[0032] The positioning piece 24 and the pressure regulating plate 18 are both provided with a waist-shaped hole 45; the upper and lower ends of the lifting rod 23 are both provided with clamping heads 46 matching the waist-shaped hole 45, and the upper clamping head 46 and the positioning piece 24, and the lower clamping head 46 and the pressure regulating plate 18 are fixed by screws 47.

[0033] A positioning seat 51 is provided below the rocker 17 and is installed in the hinge hole 1701 of the rocker 17. The lower end of the positioning screw 16 passes through the positioning seat 51. The lower end of the positioning seat 51 is provided with a fixing nut 52 which is tightened and fixed with the lower end of the positioning screw 16.

[0034] The method of use of the present invention is as follows:

[0035] In actual use, the gear box 1 is provided with a motor for driving the eccentric shaft seat 11, and the connector is provided on the upper right side of the gear box 1, the lower cylinder 4 is located directly below the upper cylinder 3, the lower cylinder 4 is provided on the right side of the gear box 1, the right end of the upper cylinder 3 is connected to the right end of the lower cylinder 4 through the cylinder seat 5, the cylinder head 6 covers the outside of the cylinder seat 5, and the cylinder seat 5 is provided with an upper vent 48 communicating with the upper cylinder 3 and a lower vent 49 communicating with the lower cylinder 4; the side wall of the cylinder head 6 opposite to the cylinder seat 5 is provided with a ventilation chamber 50, and the upper vent 48 and the lower vent 49 are communicated through the ventilation chamber 50, When the motor drives the eccentric shaft seat 11, the eccentric shaft 12 rotates accordingly, and the eccentric shaft 12 is hinged with the piston arm 13. At this time, the eccentric shaft 12 pushes the lower piston 10 to the right through the piston arm 13. At this time, the lower piston 10 moves to the right along the trajectory of the lower cylinder 4, and squeezes the gas in the lower cylinder 4 into the ventilation chamber 50 through the lower vent 49. As the lower piston 10 continues to move to the right, the air pressure in the ventilation chamber 50 continues to increase, and the pressurized gas will act on the upper piston 8 through the upper vent 48, pushing the upper piston 8 to the left. At this moment, the firing pin is restricted by the positioning plate 24, and the upper piston 8 cannot move to the left.

[0036] When the eccentric shaft 12 rotates to a certain angle, it will contact the pressure plate 18 provided on the front side of the right end of the rocker 17, thereby pushing the rocker 17. At this time, the rocker 17 rotates around the positioning screw 16, and the tension spring 42 is pulled and generates elastic force. As the rocker 17 rotates, the inclined guide plate 21 gradually moves to the bottom of the point contact 27, and finally the lower end of the point contact 27 fits with the upper surface of the inclined guide plate 21. Then, as the inclined guide plate 21 continues to rotate and move, since the inclined guide plate 21 tilts to the lower left, the extension arm 19, the plane guide plate 20 and the inclined guide plate 21 are surrounded to form a C-shaped structure, and the point contact 27 is moved by the inclined guide plate 2 1 is continuously pushed upward, and the point contact 27 is fixed on the pressure regulating plate 18, and the pressure regulating plate 18 is fixed on the lower end of the lifting rod 23. When the point contact 27 moves upward, the point contact 27 will drive the lifting rod to move upward through the pressure regulating plate 18. During the upward movement of the lifting rod 23, the lifting spring 28 is compressed and generates elastic force. When the lifting rod 23 moves upward, the positioning piece 24 arranged at the upper end of the lifting rod 23 moves upward accordingly, and the positioning piece 24 drives the positioning tooth 25 to gradually move upward and disengage from the positioning groove 26 on the striker 9. When the point contact 27 moves from the inclined guide plate 21 to the plane guide plate 20, the positioning tooth 25 completely disengages from the positioning groove 26.

[0037] Since the guide surface 34 on the rear right side of the positioning piece 24 is inclined forward and right, when the rear guide plate 36 is in contact with the guide surface 34, the rear guide plate 36 will simultaneously limit and guide the rear and side directions of the positioning piece 24. When the front guide plate 37 is in contact with the front side wall of the positioning tooth 25, the front guide plate 37 will limit and guide the front of the positioning piece 24. Under the cooperation of the front guide plate 37 and the rear guide plate 36, the positioning piece 24 can only move up and down, and the angle of the positioning piece 24 itself will not have any deviation, thereby effectively avoiding the situation where the positioning piece 24 has an angle deviation during the upward movement, which makes it difficult to quickly reset or even unable to reset. When the positioning piece 24 moves up to above the striker 9, the positioning tooth 25 of the positioning piece 24 will disengage from the positioning groove 26 of the striker 9 because there is a movable gap between the lower surface of the limit plate 35 and the upper surface of the positioning piece 24. The movable gap is greater than the thickness of the positioning piece 24, so the positioning piece 24 can drive the positioning tooth 25 to smoothly disengage from the positioning groove 26, and the upward movement of the positioning piece 24 will not be restricted by the limit plate 35. After losing the restriction of the positioning tooth 25, the firing pin 9 can move freely. At this moment, the upper piston 8 quickly drives the firing pin 9 to move to the left under the action of the high-pressure gas applied to itself, and the firing pin 9 then drives the nail out of the muzzle of the nail gun to complete the nailing action, and the front guide plate 37 and the pad 38 cooperate to limit the moving trajectory of the firing pin 9 to the same plane to prevent the firing pin from bending upward or downward, and the upper surface of the pad 38 is provided with a guide sleeve 3801 that fits with the side wall of the firing pin 9. The existence of the guide sleeve 3801 can limit the bending of the firing pin 9 to the side, effectively avoiding the radial bending of the suspended part of the firing pin 9 due to force, thereby ensuring the stability of the firing pin 9 when in use.

[0038] When a nailing is completed, the motor will drive the eccentric shaft seat 11 to drive the eccentric shaft 12 to continue rotating, so that the eccentric shaft 12 is reset. At this time, the eccentric shaft 12 pulls the lower piston 10 to move left and reset through the piston arm 13, and the gas in the upper cylinder 3 is drawn into the lower cylinder 4 through the upper vent hole 48, the vent chamber 50, and the lower vent hole 49 in sequence. The air pressure of the upper cylinder 3 changes, and the upper piston 8 moves right and resets accordingly. When the upper piston 8 moves right and resets, the upper piston 8 drives the striker 9 to move right and reset. At the same time, as the eccentric shaft 12 rotates and resets, the eccentric shaft 12 is no longer pressed on the pressure plate. After the pressure applied to the pressure plate 18 is lost, the rocker 17 is reset under the elastic force of the tension spring 42. When the rocker 17 is reset, the point contact 27 will gradually separate from the inclined guide plate 21 along the inclined upper surface of the inclined guide plate 21. In this process, the pressure regulating plate 18 is The elastic force gradually moves downward to reset. When the point contact 27 is completely separated from the inclined guide plate 21, the pressure regulating plate 18 drives the point contact 27 to completely reset. At the same time, when the positioning piece 24 is separated from the striker 9, the lifting spring 28 resets to generate downward pressure and acts on the pressure regulating plate 18. The positioning piece 24 returns to its position downward, and the lower surface is attached to the striker 9 until the striker 9 returns to its position. The positioning piece 24 enters the corresponding positioning groove 26 of the striker 9, and the striker 9 is locked again. The limiting teeth at the fitting surface of the positioning piece 24 and the striker 9 are chamfered to facilitate the positioning piece 24 to quickly enter the striker positioning groove 26.

[0039] When the rocker 17 is reset, the elastic force of the tension spring 42 instantly acts on the rocker 17, which will inevitably cause the rocker 17 to collide with the inner wall of the gear box 1. Since the diameter of the buffer sleeve 41 is larger than the width of the rocker 17, the buffer sleeve 41 will replace the rocker 17 and collide with the inner wall of the gear box 1. The buffer sleeve 41 is made of rubber material and can effectively buffer the impact force through the elastic properties of its own material, thereby effectively avoiding damage to the rocker 17 and the inner wall of the gear box 1.

[0040] When the voltage of the electric nail gun needs to be adjusted, the voltage adjustment work can be completed by simply changing the height position of the point contact 27 of the voltage adjustment structure. When the height position of the point contact 27 needs to be changed, just hold the upper end of the point contact 27 and rotate it, and the point contact 27 will move up and down along the thread track of the first screw hole 29. When the height position of the point contact 27 is adjusted, a flat-blade screwdriver can be inserted into the flat-blade slot 30 to fix the point contact 27, and then the fastening nut 31 can be rotated using an external wrench, so that the point contact is fastened to the clamping plate 18 through the fastening nut 31, effectively ensuring the stability of the point contact 27 after the height position adjustment is completed, and there will be no loosening. When the height position of the point contact 27 is changed, the inclined guide plate 21 can The distance of touching the point contact 27 changes accordingly, and the positioning tooth 25 of the positioning piece 24 can be separated from the positioning groove 26 on the firing pin 9 earlier or later. At the same time, the eccentric shaft 12 can rotate a smaller angle to touch the pressure plate 18 of the rocker 17, or rotate a larger angle to touch the pressure plate 18 of the rocker 17. As the rotation angle of the eccentric shaft 12 changes, the moving distance of the lower piston 10 changes accordingly. When the moving distance of the lower piston 10 is different, the air pressure of the squeezed gas is also different. Therefore, when the air pressure acting on the upper piston 8 is different, the force of the firing pin 9 hitting the nail is also different. Different forces can drive the nail to different depths, thereby achieving the effect of adjustable nailing depth, thereby being able to adapt to more nailing requirements.

[0041] The lower end of the point contact 27 is spherical, which can effectively reduce the friction between the point contact 27 and the inclined guide plate 21 and the plane guide plate 20, ensuring that the point contact 27 can smoothly slide along the upper surface of the inclined guide plate 21 and the upper surface of the plane guide plate 20, and the lower end of the point contact 27 is provided with a spherical groove 32, and a ball 33 matching it is provided in the spherical groove 32, and one end of the ball 33 protrudes out of the spherical groove 32. The existence of the ball 33 can further reduce the friction between the point contact 27 and the inclined guide plate 21 and the plane guide plate 20. When the point contact 27 slides, the ball 33 will roll with the help of the contact with the inclined guide plate 21 and the plane guide plate 20. The rolling ball 33 can ensure the smoothness of the sliding of the point contact 27 to the greatest extent.

[0042] In summary, the present invention can utilize the rotation of the eccentric shaft 12 to simultaneously drive the lower piston 10 to move and the rocker 17 to rotate. When the lower piston 10 moves, the pressurized gas acts on the upper piston 8 and pushes it. When the rocker 17 rotates, the positioning piece 24 drives the positioning tooth 25 to disengage from the positioning groove 26 on the striker 9. When the positioning tooth 25 is completely disengaged from the positioning groove 26, the upper piston 8 drives the striker 9 to knock out the nail, thereby achieving an automatic nailing effect. There is no need to manually release the restriction of the positioning piece 24 on the striker 9, which reduces the trouble in the nailing process and effectively improves the nailing efficiency. During the process of separating from the positioning groove 26 on the firing pin 9, the guide structure always guides the positioning piece 24, so that the positioning piece 24 can only move up and down, and its angle will not change at all, which can effectively avoid the position deviation of the positioning piece 24 during the lifting process, and ensure that the positioning piece 24 can be quickly and accurately reset. The air pressure inside the nail gun can also be adjusted through the pressure regulating structure, so that the upper piston can drive the firing pin to drive the nail under the action of different air pressures. When the force exerted by the firing pin 9 on the nail is different, different depths can be driven, achieving the effect of adjustable nailing depth, so as to meet more nailing requirements.

[0043] The positioning tooth 25 and the positioning groove 26 are both narrow at the bottom and wide at the top. The outer wall of the positioning tooth 25 and the inner wall of the positioning groove 26 are both inclined surfaces. The outer wall of the positioning tooth 25 fits the inner wall of the positioning groove 26. Since the friction between the vertical planes is much greater than the friction between the inclined surfaces, the positioning tooth 25 can be more smoothly disengaged from the positioning tooth 25 with the cooperation of its own inclined surface and the inclined surface of the positioning groove 26, effectively avoiding the situation where the positioning tooth 25 is stuck when releasing the restriction on the collision pin 9.

[0044] A buffer hole 43 which is connected to the striker hole 7 is provided on the left side of the connector 2, and the left end of the upper cylinder 3 is connected to the right end of the buffer hole 43. An annular buffer pad 44 is provided in the buffer hole 43, and the buffer pad 44 is made of rubber. When the upper piston 8 moves with the striker 9 under the maximum air pressure, the upper piston 8 will hit into the buffer hole 43. At this time, the upper piston 8 will collide with the buffer pad 44, and the buffer pad 44 will effectively buffer the upper piston 8, effectively preventing the upper piston 8 from directly hitting the inner wall of the connector 2 and causing damage. A rib groove 4301 is provided on the lower inner wall of the buffer hole 43, and a positioning rib 4401 matching the rib groove 4301 is provided on the lower surface of the buffer pad 44, and the positioning rib 4401 is embedded in the rib groove 4301. A notch 4402 is provided on the upper right side wall of the buffer pad 44. The existence of the notch 4402 makes only the lower right side wall of the buffer pad 44 contact with the upper piston 8.

[0045] Both the positioning piece 24 and the pressure regulating plate 18 are provided with waist-shaped holes 45, and both the upper and lower ends of the lifting rod 23 are provided with clamping heads 46 matching the waist-shaped holes 45. The upper clamping head 46 and the positioning piece 24, and the lower clamping head 46 and the pressure regulating plate 18 are fixed by screws 47. This connection method facilitates the disassembly between the positioning piece 24, the pressure regulating plate 18 and the lifting rod 23, and is conducive to maintenance and replacement.

Claims

1. A locking device for a firing pin of an electric nail gun, comprising a gear box, a connector, an upper cylinder, a lower cylinder, a cylinder seat, and a cylinder cover, wherein a firing pin hole intersecting the upper cylinder is provided on the left side wall of the connector, an upper piston is provided in the upper cylinder, a firing pin is provided at the center of the left side wall of the upper piston, and the left end of the firing pin passes through the firing pin hole to the left, a lower piston is provided in the lower cylinder, an eccentric shaft seat is provided in the gear box, an eccentric shaft is provided on one side of the eccentric shaft seat, a piston arm is hinged at the center of the left side wall of the lower piston, and one end of the piston arm is hinged on the eccentric shaft, characterized in that: The left side of the upper surface of the gear box is provided with a fixing hole and a positioning hole corresponding to the position of the fixing hole; a positioning screw matching therewith is installed in the positioning hole; the lower end of the positioning screw is downwardly penetrated into the internal space of the gear box and is hinged with a rocker; a reset structure matching the gear box is provided on the rocker; a pressure plate corresponding to the position of the eccentric shaft is provided on the front side of the right end of the rocker; an extension arm is provided on the rear side of the middle part of the rocker; a plane guide plate is provided at the end of the extension arm; the plane guide plate is provided with an inclined guide plate inclined to the lower left, and the extension arm, the plane guide plate and the inclined guide plate are enclosed to form a C-shaped structure; a matching structure is provided in the fixing hole A fixing tube, the lower end of the fixing tube is pressed into the internal space of the gear box, and the fixing tube is tightly fixed with the fixing hole; a lifting rod is arranged in the fixing tube; the upper end of the lifting rod passes through the fixing tube and is provided with a positioning plate; the front side of the right part of the positioning plate is provided with a number of evenly distributed positioning teeth; the side of the striker opposite to the positioning plate is provided with a number of positioning grooves matching the positioning teeth; the upper end of the positioning screw is provided with a guide structure matching the positioning plate; the lower end of the lifting rod passes through the fixing tube downward and is provided with a pressure regulating plate; the pressure regulating plate is provided with a pressure regulating structure; the pressure regulating structure includes a point contact corresponding to the position of the inclined guide plate; the pressure regulating plate and the lower end of the fixing tube A lifting spring is provided between the end faces and is sleeved on the outside of the lifting rod; the pressure regulating structure includes a first screw hole provided on the right part of the pressure regulating plate, and the point contact is screwed in the first screw hole; a straight groove is provided on the upper end of the point contact, and the lower end of the point contact is spherical; a fastening nut is screwed on the outside of the point contact and fits the upper surface of the pressure regulating plate; a guide surface inclined forward and right is provided on the rear side of the right part of the positioning plate; the guide structure includes a limit plate screwed on the upper end of the positioning screw, and the limit plate is located above the striker; there is a movable gap between the lower surface of the limit plate and the upper surface of the positioning plate, and the movable gap is greater than the thickness of the positioning plate; the outer wall of the gear box is provided with a side opposite to the limit plate and is A rear guide plate is formed in contact with the front surface of the rocker, and one end of the limit plate is provided with a front guide plate that is in contact with the front side wall of the positioning tooth; the lower end surface of the front guide plate is in contact with the upper surface of the striker; the upper part of the positioning screw is provided with a pad located at the lower surface of the striker, and the upper surface of the pad is provided with a guide sleeve that is in contact with the side wall of the striker; the reset structure includes a second screw hole provided in the middle of the rocker, and a fixing bolt is threaded in the second screw hole; the head of the fixing bolt is located above the rocker, and the head of the fixing bolt is covered with a buffer sleeve, which is made of rubber; the diameter of the buffer sleeve is greater than the width of the rocker; the fixing bolt is connected to the inner wall of the gear box by a tension spring.

2. The locking device for the firing pin of an electric nail gun according to claim 1, characterized in that: A ball-shaped embedding groove is arranged at the lower end of the point contact; a ball matched with the ball-shaped embedding groove is arranged in the ball-shaped embedding groove, and one end of the ball-shaped embedding groove protrudes out of the ball-shaped embedding groove.

3. The locking device for the firing pin of an electric nail gun according to claim 1, characterized in that: The positioning teeth and the positioning groove are both narrow at the bottom and wide at the top, the outer wall of the positioning teeth and the inner wall of the positioning groove are both inclined surfaces, and the outer wall of the positioning teeth fits the inner wall of the positioning groove.

4. The locking device for the firing pin of an electric nail gun according to claim 1, characterized in that: A buffer hole that is connected to the striker hole is provided on the left side of the connecting head, and the left end of the upper cylinder is connected to the right end of the buffer hole; an annular buffer pad is provided in the buffer hole, and the buffer pad is made of rubber; a rib groove is provided on the lower inner wall of the buffer hole; a positioning rib matching the rib groove is provided on the lower surface of the buffer pad, and the positioning rib is embedded in the rib groove; a notch is provided on the upper right side wall of the buffer pad.

5. The locking device for the firing pin of an electric nail gun according to claim 1, characterized in that: The positioning piece and the pressure regulating plate are both provided with a waist-shaped hole; the upper and lower ends of the lifting rod are both provided with clamps matching the waist-shaped holes, and the upper clamp and the positioning piece, and the lower clamp and the pressure regulating plate are fixed by screws.

6. The locking device for the firing pin of an electric nail gun according to claim 1, characterized in that: A positioning seat is provided below the rocker and is installed in the rocker hinge hole, and the lower end of the positioning screw passes through the positioning seat; a fixing nut is provided at the lower end of the positioning seat and is tightened and fixed with the lower end of the positioning screw.

Images