A locking and unlocking structure of a locking block on a nail gun

Abstract

A kind of locking and unlocking structure of locking block on nail gun, including power box, movable needle of being arranged above power box, needle is formed with multiple catches at one side at equal intervals, needle is formed with a clamping hole at the other side, fixed mandrel is installed on the side of needle with clamping hole on power box, fixed mandrel is equipped with a rotatable locking block, locking block is by rotating and is clamped into or the position of leaving clamping hole to realize the locking or unlocking of needle, power box is also equipped with tension spring, and tension spring makes locking block reset to locking mode, drive motor is equipped below power box, cam is equipped on the output shaft of drive motor, cam is by intermediate transmission component to realize the rotation limit of locking block, intermediate transmission component includes a synchronous shaft, a support seat, a lever;Locking and unlocking of locking block are realized by the lifting, descending of lever, after testing, wear is still smaller after locking and unlocking of locking block for 150,000 times, nail gun still maintains good use performance, and durability is improved.

Description

Technical Field

[0001] This invention relates to a locking and unlocking structure for a locking block on a nail gun. Background Technology

[0002] A nail gun is a device used for nailing. In a single-cylinder structure of a nail gun, the output end of the drive motor is connected to a lifting wheel via a reducer. The lifting wheel has multiple pins arranged in a circle, which can engage with the locking teeth on one side of the firing pin. The rear end of the firing pin is a piston cylinder structure, with the firing pin fixedly connected to the piston. The rotation of the lifting wheel causes the firing pin to move from the lower dead center to the upper dead center. At the same time, high pressure is generated in the cylinder. A locking slot is machined on the other side of the firing pin. The locking block rotates and engages in the locking slot to achieve the locked state, so that the firing pin stops at the upper dead center position. When the locking block leaves the locking slot to achieve the unlocked state, the high pressure of the cylinder will cause the firing pin to fire, realizing nailing. The firing pin moves from the upper dead center to the lower dead center position. Through the unidirectional rotation of the lifting wheel and the locking and unlocking process of the locking block, the reciprocating motion of the firing pin of the nail gun between the upper dead center and the lower dead center position is realized.

[0003] For example, in the nail gun described in the CN114536278A scheme, the rotation of the locking block is achieved by the cooperation of the drive wheel, locking ball, and locking seat, thereby realizing the locking and unlocking functions. The drive wheel is machined with an unlocking groove, and the locking block is machined with a spherical groove. Fatigue tests have shown that after 30,000 to 50,000 unlocking and locking tests, significant wear occurs at the drive wheel and locking seat, which affects the performance of the nail gun. In the prior art, the drive wheel and locking block are made of alloy materials with high hardness, and the presence of the unlocking groove and spherical groove also places high demands on the machining of the drive wheel and locking block parts.

[0004] From a materials perspective, the wear of the locking block structure of the nail gun is difficult to improve significantly. Given the difficulties of existing technology, this solution was developed. Summary of the Invention

[0005] To address the shortcomings mentioned above, this invention provides a locking and unlocking structure for a locking block on a nail gun.

[0006] To achieve the above objectives, the present invention provides a locking and unlocking structure for a locking block on a nail gun, comprising a power box and a firing pin movably disposed above the power box. The firing pin has multiple teeth machined at equal intervals on one side and a latch formed on the other side. A fixed spindle is mounted on the side of the firing pin with the latch on the power box. A rotatable locking block is provided on the fixed spindle. The locking block locks or unlocks the firing pin by rotating to engage or disengage from the latch. A tension spring is also provided on the power box to reset the locking block to a locked position. A drive motor is located below the power box, and a cam is provided on the output shaft of the drive motor. The cam restricts the rotation of the locking block through an intermediate transmission assembly. The intermediate transmission assembly includes a synchronous shaft, a support base, and a lever. The synchronous shaft is rotatably mounted on the power box and located on one side of the fixed spindle. A rocker arm is fixed to the lower end of the synchronous shaft, and a torsion spring is provided on the rocker arm. The rocker arm and the cam form a transmission connection to drive the synchronous shaft to rotate by swinging. A synchronous wheel is fixed to the upper end of the synchronous shaft, and a first inclined surface is machined on the upper surface of the synchronous wheel. The support base is fixed to the upper part of the power box, and a pivot shaft is provided at one end of the support base. The lever is rotatably mounted on the pivot shaft. A second inclined surface is machined on the end of the lever near the synchronous wheel, and the second inclined surface matches the first inclined surface. A spring is provided on the other end of the lever away from the synchronous wheel.

[0007] In the locked mode, the inner side of the lever at the end away from the synchronous pulley abuts against the outer side of the locking block, restricting the rotation of the locking block.

[0008] Furthermore, the power box is equipped with a lifting wheel on the side of the firing pin with the retaining teeth. The lifting wheel engages with the retaining teeth through multiple pins to drive the firing pin to move from the lower stop position to the upper stop position.

[0009] Furthermore, a spring post is fixed on the locking block, and a tension spring bracket is fixed on the power box. One end of the tension spring is pulled on the tension spring bracket, and the other end of the tension spring is pulled on the spring post, so that the locking block maintains the tendency to reset to the upward locking mode.

[0010] Furthermore, the fixed spindle is also provided with a guide pad, which is located above the locking block. The guide pad matches the flat part of the fixed spindle through a flat groove. The upper part of the guide pad is locked by a locking nut. The power box is also provided with a pressure plate, which is fixed by a first bolt and a second bolt. The pressure plate is located above the firing pin and is perpendicular to the firing pin. A bushing is fitted on the first bolt. The guide pad has an integral guide part, which is curved and hook-shaped. Both inner sides of the guide part are attached to the bushing.

[0011] Furthermore, a limiting piece is also provided on the fixed mandrel. The limiting piece is located between the guide pad and the locking nut. The limiting piece has an integral first limiting end and a second limiting end. After positioning and installation, the first limiting end is close to the first bolt, and the second limiting end is used to limit the position of the tension spring.

[0012] Furthermore, a copper sleeve is provided between the synchronous shaft and the power box, the copper sleeve is fixedly installed on the power box, and the synchronous shaft is rotatably disposed inside the copper sleeve.

[0013] Furthermore, a balance pressure plate is fixed above the power box, and the end of the lever near the synchronous pulley moves within the guide groove of the balance pressure plate.

[0014] Furthermore, in the locked mode, the outer side of the lever at the end furthest from the synchronous pulley abuts against the force-bearing surface of the support.

[0015] Furthermore, the locking block also has a first limiting portion, and the support base has a second limiting portion, which interacts with the first limiting portion to limit the position of the locking block in the locked mode.

[0016] The advantages of this invention over the prior art are as follows: the locking and unlocking of the locking block are achieved by raising and lowering the lever. Laboratory tests show that after 150,000 locking and unlocking cycles, the wear on the locking block is still relatively small, the nail gun still maintains good performance, and the durability is greatly improved. Attached Figure Description

[0017] Figure 1 This is a perspective view of a locking and unlocking structure for a locking block on a nail gun according to the present invention;

[0018] Figure 2 This is a schematic diagram showing the positional relationship between the firing pin and the lifting wheel.

[0019] Figure 3 This is a structural diagram of the locking block portion on one side of the firing pin involved;

[0020] Figure 4 An exploded view of the locking block portion on one side of the firing pin involved;

[0021] Figure 5 This is a schematic diagram of the intermediate transmission components involved;

[0022] Figure 6 This is a schematic diagram of the fixed mandrel involved;

[0023] Figure 7 A schematic diagram illustrating the function of the guide pads and bushings involved.

[0024] Figure 8 This is a schematic diagram of the guide pads involved;

[0025] Figure 9 This is a schematic diagram of the limiting piece involved;

[0026] Figure 10 This is a schematic diagram of the locked block in locked mode.

[0027] In the diagram: 1. Power unit; 2. Strike pin; 21. Clamping tooth; 22. Bayonet; 3. Fixed spindle; 31. Flat part; 4. Locking block; 41. First limiting part; 5. Tension spring; 6. Cam; 7. Intermediate transmission assembly; 71. Synchronous shaft; 72. Rocker arm; 73. Torsion spring; 74. Synchronous pulley; 741. First inclined plane; 75. Support seat; 751. Force-bearing surface; 752. Second limiting part; 76. Pivot shaft; 77. Spring 78. Lever; 781. Second inclined plane; 8. Lifting wheel; 81. Pin; 9. Spring column; 10. Tension spring bracket; 11. Guide pad; 111. Flat groove; 112. Guide part; 12. Limiting piece; 121. First limiting end; 122. Second limiting end; 13. Locking nut; 14. Pressure plate; 15. First bolt; 16. Second bolt; 17. Bushing; 18. Balance pressure plate; 181. Guide groove. Detailed Implementation

[0028] like Figure 1 , Figure 2 and Figure 3As shown, an embodiment of the present invention provides a locking and unlocking structure for a locking block on a nail gun, comprising a power box 1 and a firing pin 2 movably disposed above the power box 1. The firing pin 2 has multiple teeth 21 machined at equal intervals on one side and a slot 22 machined on the other side. A fixed spindle 3 is mounted on the side of the firing pin 2 with the slot 22 on the power box 1. A rotatable locking block 4 is provided on the fixed spindle 3. The locking block 4 locks or unlocks the firing pin 2 by rotating to engage or disengage from the slot 22. The power box 1 is also provided with a tension spring 5, which resets the locking block 4 to the locked mode. A drive motor is provided below the power box 1. A cam 6 is provided on the output shaft of the drive motor. The cam 6 restricts the rotation of the locking block 4 through an intermediate transmission assembly 7.

[0029] like Figure 4 , Figure 5 As shown, the intermediate transmission assembly 7 includes a synchronous shaft 71, a support 75, and a lever 78. The synchronous shaft 71 is rotatably mounted on the power box 1 and located on one side of the fixed spindle 3 (a copper sleeve is also provided between the synchronous shaft 71 and the power box 1, and the copper sleeve is fixedly installed on the power box 1, with the synchronous shaft 71 rotatably located inside the copper sleeve, which can reduce wear). A rocker arm 72 is fixed to the lower end of the synchronous shaft 71, and a torsion spring 73 is provided on the rocker arm 72. The rocker arm 72 forms a transmission connection with the cam 6 to drive the synchronous shaft 71 by swinging. Rotation, torsion spring 73 is used to reset rocker arm 72, synchronous wheel 74 is fixed at the upper end of synchronous shaft 71, the upper surface of synchronous wheel 74 is machined to form a first inclined surface 741, support seat 75 is fixed at the upper part of power box 1, one end of support seat 75 is provided with pivot shaft 76, lever 78 is rotatably arranged on pivot shaft 76, the end of lever 78 near synchronous wheel 74 is machined with a second inclined surface 781, the second inclined surface 781 matches the first inclined surface 741, the other end of lever 78 away from synchronous wheel 74 is provided with spring 77;

[0030] like Figure 2 As shown, the power box 1 has a lifting wheel 8 on the side of the firing pin 2 with the retaining tooth 21. The lifting wheel 8 is engaged with the retaining tooth 21 through multiple pins 81 to drive the firing pin 2 to move from the lower stop position to the upper stop position.

[0031] like Figure 3 As shown, a spring post 9 is fixed on the locking block 4, and a tension spring bracket 10 is fixed on the power box 1. One end of the tension spring 5 is pulled on the tension spring bracket 10, and the other end of the tension spring 5 is pulled on the spring post 9, so that the locking block 4 maintains the tendency to reset to the upward locking mode.

[0032] like Figure 4 , Figure 6 , Figure 8As shown, a guide pad 11 is also provided on the fixed spindle 3. The guide pad 11 is located above the locking block 4. The guide pad 11 matches the flat part 31 of the fixed spindle 3 through the flat groove 111. The upper part of the guide pad 11 is locked by a locking nut 13. A pressure plate 14 is also provided on the power box 1. The pressure plate 14 is fixed by the first bolt 15 and the second bolt 16. The pressure plate 14 is located above the firing pin 2 and is perpendicular to the firing pin 2. A bushing 17 is fitted on the first bolt 15. The guide pad 11 has an integral guide part 112. The guide part 112 is curved and hook-shaped. Both inner sides of the guide part 112 are tightly attached to the bushing 17 (see...). Figure 7 The guide pad 11 and the fixed spindle 3 form a synchronous rotation structure through the assembly of the flat groove 111 and the flat part 31. The bushing 17 restricts the rotation of the guide pad 11 in the planar direction, ensuring that the fixed spindle 3 is not prone to torsional deformation. The pressure plate 14 presses on the guide pad 11, ensuring that the fixed spindle 3 is not prone to bending deformation, so that the impact of the firing pin 2 on the fixed spindle 3 is well offset, and the fixed spindle 3 reaches a more stable state.

[0033] like Figure 3 , Figure 9 As shown, a limiting piece 12 is also provided on the fixed mandrel 3. The limiting piece 12 is located between the guide pad 11 and the locking nut 13. The limiting piece 12 has an integral first limiting end 121 and a second limiting end 122. After positioning and installation, the first limiting end 121 is close to the first bolt 15, and the second limiting end 122 is used to limit the position of the tension spring 5.

[0034] like Figure 3 As shown, a balance plate 18 is also fixed above the power box 1. The end of the lever 78 near the synchronous wheel 74 moves within the guide groove 181 of the balance plate 18, giving the lever 78 better stability.

[0035] like Figure 4 As shown, the inner side of the end of lever 78 furthest from synchronizer pulley 74 abuts against the outer side of locking block 4, restricting the rotation of locking block 4, as... Figure 10 As shown, the outer side of the end of lever 78 away from synchronous wheel 74 abuts against the force-bearing surface 751 of support seat 75. In this way, the force on locking block 4 can be indirectly transmitted to support seat 75, reducing the direct force on lever 78.

[0036] like Figure 10 As shown, the locking block 4 also has a first limiting part 41, and the support base 75 has a second limiting part 752. The second limiting part 751 interacts with the first limiting part 41 to limit the position of the locking block 4 in the locking mode, so as to prevent the locking block 4 from over-rotating when the tension spring 5 drives the locking block 4 to return to its original position.

[0037] The locking and unlocking of the locking block is achieved by raising and lowering the lever. Laboratory tests show that after 150,000 locking and unlocking cycles, the wear on the locking block is still relatively small, and the nail gun still maintains good performance, significantly improving durability.

[0038] In practical use, the invention will be described in conjunction with the accompanying drawings for ease of understanding;

[0039] In the locked state, under the action of torsion spring 73, the first inclined surface 741 and the second inclined surface 781 are not in contact. Lever 78 tilts upwards at one end under the action of spring 77, and the tilted end of lever 78 is pressed tightly against the outer side of locking block 4. At this time, locking block 4 is engaged in the latch 22 of the firing pin 2. Figure 4 , Figure 10 As shown.

[0040] Upon unlocking, the drive motor of power box 1 drives cam 6 to rotate and make quick, brief contact with rocker arm 72. Rocker arm 72 swings at a small angle, and the swing is transmitted to the upper synchronous pulley 74 via synchronous shaft 71. Figure 5 In the middle, the synchronous pulley 74 rotates clockwise at a certain angle, the first inclined surface 741 contacts the second inclined surface 781, and the second inclined surface 781 rises along the first inclined surface 741, so that the lever 78 overcomes the elastic force of the spring 77. The end of the lever 78 near the locking block 4 moves downward around the pivot 76. When the end of the lever 78 near the locking block 4 is completely sunk into the support seat 75 and no longer limits the locking block 4, the high-pressure gas in the cylinder causes the firing pin 2 to be fired. The firing pin 2 overcomes the tension of the tension spring 5 and pushes the locking block 4 to rotate and disengage from the bayonet 22. Figure 4 (In the counterclockwise direction), locking block 4 releases the restriction on strike pin 2, strike pin 2 moves from the upper stop position to the lower stop position, and locking block 4 leaves the position of bayonet 22, thus unlocking locking block 4;

[0041] When the lifting wheel 8 stops rotating after one revolution, the fired firing pin 2 will be brought back to the upper stop position. At this time, under the action of the tension spring 5, the locking block 4 will rotate again and engage with the slot 22 of the firing pin 2. Figure 4 (Clockwise direction) Due to the torsion spring 73, the synchronous wheel 74 is reset, and the spring 77 changes the state of the lever 78 again, causing the end of the lever 78 near the locking block 4 to move upward around the pivot 76 and press against the locking block 4, thus locking. When the lifting wheel 8 stops after rotating one revolution, the pin 81 is completely disengaged from the retaining teeth 21 on the striker 2.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A locking and unlocking structure for a locking block on a nail gun, comprising a power box (1) and a firing pin (2) movably disposed above the power box (1), wherein the firing pin (2) has multiple teeth (21) equally spaced on one side and a notch (22) formed on the other side; a fixed spindle (3) is mounted on the side of the firing pin (2) with the notch (22) on the power box (1); a rotatable locking block (4) is provided on the fixed spindle (3); the locking block (4) locks or unlocks the firing pin (2) by rotating to engage or disengage from the notch (22); a tension spring (5) is also provided on the power box (1); the tension spring (5) resets the locking block (4) to the locked mode; characterized in that: A drive motor is located below the power box (1), and a cam (6) is provided on the output shaft of the drive motor. The cam (6) restricts the rotation of the locking block (4) through an intermediate transmission assembly (7). Specifically, the intermediate transmission assembly (7) includes a synchronous shaft (71), a support seat (75), and a lever (78). The synchronous shaft (71) is rotatably mounted on the power box (1) and located on one side of the fixed spindle (3). A rocker arm (72) is fixed to the lower end of the synchronous shaft (71), and a torsion spring (73) is provided on the rocker arm (72). The rocker arm (72) and the cam (6) form a transmission connection to drive the locking block (4) by swinging. The synchronous shaft (71) rotates, and a synchronous wheel (74) is fixed at the upper end of the synchronous shaft (71). A first inclined surface (741) is formed on the upper surface of the synchronous wheel (74). The support seat (75) is fixed at the upper part of the power box (1). A pivot shaft (76) is provided at one end of the support seat (75). The lever (78) is rotatably arranged on the pivot shaft (76). A second inclined surface (781) is formed at the end of the lever (78) close to the synchronous wheel (74). The second inclined surface (781) matches the first inclined surface (741). A spring (77) is provided at the other end of the lever (78) away from the synchronous wheel (74). In the locked mode, the inner side of the end of the lever (78) away from the synchronous wheel (74) abuts against the outer side of the locking block (4), restricting the rotation of the locking block (4).

2. The locking and unlocking structure for a locking block on a nail gun according to claim 1, characterized in that: The power box (1) has a lifting wheel (8) on the side of the striker (2) with a retaining tooth (21). The lifting wheel (8) is engaged with the retaining tooth (21) through multiple pins (81) to drive the striker (2) to move from the lower stop position to the upper stop position.

3. The locking and unlocking structure for a locking block on a nail gun according to claim 2, characterized in that: A spring post (9) is fixed on the locking block (4), and a tension spring bracket (10) is fixed on the power box (1). One end of the tension spring (5) is pulled on the tension spring bracket (10), and the other end of the tension spring (5) is pulled on the spring post (9), so that the locking block (4) maintains the tendency to reset to the upward locking mode.

4. The locking and unlocking structure for a locking block on a nail gun according to claim 3, characterized in that: The fixed spindle (3) is also provided with a guide pad (11). The guide pad (11) is located on the upper part of the locking block (4). The guide pad (11) is matched with the flat part (31) of the fixed spindle (3) through the flat groove (111). The upper part of the guide pad (11) is locked by a locking nut (13). The power box (1) is also provided with a pressure plate (14). The pressure plate (14) is fixed by a first bolt (15) and a second bolt (16). The pressure plate (14) is located above the firing pin (2) and is perpendicular to the firing pin (2). A bushing (17) is sleeved on the first bolt (15). The guide pad (11) has an integral guide part (112). The guide part (112) is curved and hook-shaped. The two inner sides of the guide part (112) are attached to the bushing (17).

5. The locking and unlocking structure for a locking block on a nail gun according to claim 4, characterized in that: The fixed mandrel (3) is also provided with a limiting piece (12). The limiting piece (12) is located between the guide pad (11) and the locking nut (13). The limiting piece (12) has an integral first limiting end (121) and a second limiting end (122). After positioning and installation, the first limiting end (121) is close to the first bolt (15), and the second limiting end (122) is used to limit the position of the tension spring (5).

6. The locking and unlocking structure for a locking block on a nail gun according to claim 1, characterized in that: A copper sleeve is also provided between the synchronous shaft (71) and the power box (1). The copper sleeve is fixedly installed on the power box (1), and the synchronous shaft (71) is rotatably disposed inside the copper sleeve.

7. The locking and unlocking structure for a locking block on a nail gun according to claim 1, characterized in that: A balance plate (18) is also fixed above the power box (1), and the lever (78) near the synchronous wheel (74) moves in the guide groove (181) of the balance plate (18).

8. The locking and unlocking structure for a locking block on a nail gun according to claim 1, characterized in that: In the locked mode, the outer side of the lever (78) at the end away from the synchronous wheel (74) abuts against the force-bearing surface (751) of the support seat (75).

9. The locking and unlocking structure for a locking block on a nail gun according to claim 1, characterized in that: The locking block (4) also has a first limiting part (41), and the support seat (75) has a second limiting part (752). The second limiting part (751) interacts with the first limiting part (41) to limit the position of the locking block (4) in the locked mode.

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