阅读说明：本技术 一种气动钉枪 (Pneumatic nail gun ) 是由 杨伟明 韩挺 于 2020-05-25 设计创作，主要内容包括：本发明针对现有技术中磁性闩锁磁力不一致,钉枪力不一致,活塞耐用度不高的弊端,提供一种气动钉枪,属于气动钉枪技术领域,包括机壳、电机、第一气缸、第二气缸、送钉组件、扳机,第一活塞、第二活塞,所述第一活塞由电机驱动齿轮带动齿条在第一气缸内座往复运动,所述第二气缸位于第一气缸内,第一气缸第二气缸共同一个前部端盖和一个尾部端盖,第二活塞上设有配重块和减震环,所述尾部端盖的内侧面安装有锁扣组件对第二活塞锁定,所述第一活塞设有用于打开锁扣组件的开锁顶杆。本发明装配简单,且提升钉枪的稳定性和活塞的耐用度。(The invention provides a pneumatic nail gun aiming at the defects of inconsistent magnetic latch magnetic force, inconsistent nail gun force and low piston durability in the prior art, and belongs to the technical field of pneumatic nail guns. The invention has simple assembly and improves the stability of the nail gun and the durability of the piston.)

1. A pneumatic nail gun comprises a casing (1), a motor (2), a first cylinder (13), a second cylinder (14), a nail feeding assembly (23) and a power assembly (3), wherein a trigger (5) for controlling the power assembly (3) is arranged on the casing (1), a nailing nozzle (22) is fixedly arranged on the casing (1), the nail feeding component (23) is detachably and fixedly connected with the nailing nozzle (22), characterized in that the second cylinder (14) is positioned in the first cylinder (13), the front end of the first cylinder (13) and the front end of the second cylinder (14) are jointly and fixedly provided with a front end cover (19), the tail end of the first cylinder (13) and the tail end of the second cylinder (14) are jointly and fixedly provided with a tail end cover (10), the tail end cover (10) is provided with a vent groove (50) for communicating the first cylinder (13) with the second cylinder (14); a first piston (9) which is sleeved on a second cylinder (14) and can slide along the first cylinder (13) is arranged in the first cylinder (13), the first piston (9) and the power assembly (3) are fixedly connected and only can do reciprocating motion in the first cylinder (13), a second piston (15) is arranged in the second cylinder (14), the second piston (15) comprises a piston core (32) and a piston body (33) which is sleeved on the piston core (32), a firing pin (18) which is arranged towards the nailing nozzle (22) is fixedly arranged on one side, facing the front end cover (19), of the piston core (32), a clamping piece (30) provided with a bayonet (31) is fixedly connected to one side, facing the tail end cover (10), of the piston core (32), a balancing weight (34) and a damping ring (16) are fixedly connected to the piston core (32), and the balancing weight (34) is positioned on one side, facing the tail end cover (10), of the piston body (33), the shock absorption ring (16) is sleeved outside the firing pin (18) and is positioned on one side, facing the front end cover (19), of the piston body (33); a locking buckle component (11) capable of locking the clamping piece (30) is installed on the inner side surface of the tail end cover (10), and an unlocking ejector rod (12) used for unlocking the locking buckle component (11) is fixedly connected to one side, facing the tail end cover, of the first piston (9); and a damping block (17) matched with the damping ring (16) is fixedly arranged on the front end cover (19).

2. The pneumatic nail gun according to claim 1, wherein the locking assembly (11) comprises a limiting sleeve (29) fixedly mounted on the tail end cover (10) and matched with the clamping member (30), a first through hole (41) is formed in the side surface of the limiting sleeve (29), a guide sleeve (27) arranged towards the first through hole (41) is fixedly arranged on the inner side of the tail end cover (10), a lock tongue (43) only capable of sliding along the guide sleeve (27) is arranged in the guide sleeve (27), a spring (26) capable of pushing the lock tongue (43) to enable one end of the lock tongue (43) to penetrate through the first through hole (41) and be embedded into the bayonet (31) is arranged in the guide sleeve (27), an unlocking through hole (45) is formed in the lock tongue (43), an unlocking inclined surface (46) is formed in one side surface of the unlocking through hole (45), and a second through hole (44) corresponding to the unlocking through hole (45) is formed in the guide sleeve (27, the unlocking ejector rod (12) is provided with a pushing inclined plane (48) matched with the unlocking inclined plane (46).

3. The pneumatic nail gun of claim 2, wherein the inner side surface of the tail end cover (10) is provided with a limiting sleeve mounting groove (51) and a lock catch mounting groove (52), the side surface of the limiting sleeve mounting groove (51) is communicated with the lock catch mounting groove (52), the limiting sleeve (29) is fixedly arranged in the limiting sleeve mounting groove (51), the guide sleeve (27) is embedded into the lock catch mounting groove (52), one end of the guide sleeve (27) is attached to the side surface of the limiting sleeve (29), the other end of the guide sleeve (27) is attached to the end portion of the lock catch mounting groove (52), the inner side surface of the tail end cover (10) is further provided with a compression plate (28) which compresses and fixes the guide sleeve (27) in the lock catch mounting groove (52), and the compression plate (28) and the tail end cover (10) are detachably and fixedly connected through screws.

4. The pneumatic nail gun according to claim 3, wherein the stop collar mounting groove (51) penetrates through the tail end cover (10), the stop collar (29) comprises a stop collar (38), a sleeve body (39) and a stud (40) which are fixedly connected in sequence, the side surface of the stop collar (38) protrudes outwards relative to the sleeve body (39), the stop collar (38) is attached to the inner side surface of the tail end cover (10), the stud (40) penetrates through the stop collar mounting groove (51) and is screwed with a nut (53) attached to the outer side surface of the tail end cover (10), the first through hole (41) is formed in the sleeve body (39), a first annular groove (42) is formed in the sleeve body (39), and a first sealing ring (54) is installed in the first annular groove (42).

5. The pneumatic nail gun of claim 1, wherein the power assembly (3) comprises a motor (2), a gearbox (24) and a rack (20), a rotating shaft of the motor (2) is connected with an input end of the gearbox (24), an output end of the gearbox (24) is fixedly connected with a gear (21) meshed with the rack (20), a first piston (9) is fixedly connected with the rack (20) and can reciprocate in a first cylinder (13) along with the rack (20), two Hall sensors (7) respectively positioned beside the front end and the rear end of the first cylinder (13) are further fixedly arranged in the casing (1), and a magnetic block (8) matched with the Hall sensors (7) is further fixedly arranged on the first piston (9); the motor is characterized in that a circuit board (25) with a single chip microcomputer is fixedly arranged in the shell (1), and the circuit board (25) is electrically connected with the Hall sensor (7) and the motor (2) respectively.

6. The pneumatic nail gun according to claim 1, wherein the power assembly (3) comprises a motor (2), a gearbox (24) and a connecting rod (59), a rotating shaft of the motor (2) is connected with an input end of the gearbox (24), an output end of the gearbox (24) is vertically and fixedly connected with a crank (58), one end of the connecting rod (59) is rotatably connected with an outer end of the crank (58), and the other end of the connecting rod (59) is hinged with the first piston (9).

7. The pneumatic nail gun as claimed in claim 1, wherein the damping ring (16) is provided with a clamping groove (36) with a circular ring structure on the outer side, the piston body (33) is fixedly provided with a clamping ring (37) with a circular ring structure, and the clamping ring (37) is embedded into the clamping groove (36).

8. A pneumatic nailer according to claim 1, characterised in that a vent (57) is provided in the wall of the first cylinder (13) adjacent the front end cap (19) and in the wall of the second cylinder (14) adjacent the front end cap (19).

9. A pneumatic nailer according to claim 1, characterised in that a second sealing ring (55) is provided between said tail end cap (10) and said first cylinder (13), and in that a second annular groove (49) is provided in said tail end cap (10) for receiving said second sealing ring (55).

Technical Field

The invention belongs to the technical field of pneumatic nail guns, and particularly relates to a pneumatic nail gun.

Background

The pneumatic nail gun is very common in the field of woodworking, and takes compressed gas as a power source, and high-pressure gas drives a firing pin in a nail gun cylinder to perform hammering motion so as to drive a row of nails in a row of nail clamps into an object or eject the row of nails. The common pneumatic nail gun is connected with external compressed gas as a power source through an air pipe, and an air pump (an air compressor) is required to be configured for matching use, so that a lot of limitations are brought to the field, the range and the like during actual use. Another existing pneumatic nail gun drives a piston to compress air through a motor, and utilizes the generated air pressure difference to enable a firing pin to do reciprocating motion in an air cylinder, so that fasteners such as nails and the like are quickly nailed into objects such as wood and the like. For example, publication No. CN105339137B discloses a pneumatic fastener driver, which uses a large cylinder and a small cylinder, and uses a motor to drive a piston of the large cylinder to move to compress air, the large cylinder is in fluid communication with the small cylinder, and the small piston is locked at a high position by using the magnetic force of a magnetic latch. The problem is solved well, but due to the limitation of production technology, the magnetic force of the magnet can have individual difference, so that the nail-shooting force of nail guns with the same structure is inconsistent. In addition, the piston connected to the striker is easily damaged by absorbing the reaction force of the impact at every hammering movement, and in order to improve durability of the piston, the piston is generally made of a metal material instead of a plastic material, which increases not only cost but also weight of the pneumatic nail gun and burden on the operator to hold the nail gun.

Disclosure of Invention

The invention provides a pneumatic nail gun aiming at the defects of inconsistent magnetic latching force, inconsistent nail gun force and low piston durability in the prior art, the pneumatic nail gun is simple and convenient to assemble, and the stability of the nail gun and the durability of a piston are improved.

The invention aims to be realized by the following technical scheme:

a pneumatic nail gun comprises a casing, a motor, a first air cylinder, a second air cylinder, a nail feeding assembly and a power assembly, wherein a trigger used for controlling the power assembly is installed on the casing, a nailing nozzle is fixedly arranged on the casing, the nail feeding assembly is detachably and fixedly connected with the nailing nozzle, the second air cylinder is positioned in the first air cylinder, the front end of the first air cylinder and the front end of the second air cylinder are jointly and fixedly provided with a front end cover, the tail end of the first air cylinder and the tail end of the second air cylinder are jointly and fixedly provided with a tail end cover, and the tail end cover is provided with a vent groove for communicating the first air cylinder with the second air cylinder; a first piston which is sleeved on a second cylinder and can slide along the first cylinder is arranged in the first cylinder, the first piston is fixedly connected with the power assembly and only can do reciprocating motion in the first cylinder, a second piston is arranged in the second cylinder, the second piston comprises a piston core and a piston body sleeved on the piston core, a firing pin arranged towards the nailing nozzle is fixedly arranged on one side of the piston core, which faces the front end cover, a clamping piece provided with a bayonet is fixedly connected to one side of the piston core, which faces the tail end cover, a balancing weight and a damping ring are fixedly connected to the piston core, the balancing weight is positioned on one side of the piston body, which faces the tail end cover, and the damping ring is sleeved outside the firing pin and positioned on one side of the piston body, which faces the front end cover; the inner side surface of the tail end cover is provided with a lock catch assembly capable of locking the clamping piece, and one side of the first piston, which faces the tail end cover, is also fixedly connected with an unlocking ejector rod for unlocking the lock catch assembly; and the front end cover is fixedly provided with a damping block matched with the damping ring.

In the above-mentioned scheme, first cylinder and second cylinder sharing end cover, such integrated design has retrencied the quantity of spare part to simplify the installation step, improve assembly speed. The inner side of the tail end cover is provided with the lock catch component, only the air tightness treatment is needed to be carried out between the tail end cover and the first air cylinder, and the air tightness treatment is not needed to be carried out on the lock catch component, so that the operation is simple, and the sealing effect is good. Lock the second piston on the tail end cover, first piston is towards afterbody end cover direction compressed gas under the drive of rack, because first cylinder and second cylinder are the intercommunication, so compressed gas applys the effort that makes the second piston break away from the tail end cover to the second piston this moment, unblank the hasp subassembly when fixing the ejector pin of unblanking on first piston, the second piston breaks away from the tail end cover, do the hammering motion towards nailing mouth direction, such design is compared in locking the second piston more stably through magnetic attraction, can not receive magnetic material's individual difference influence, thereby the uniformity of batch product has been improved. The piston connected with the firing pin can impact the front end cover in each work of the nail gun, and the second piston is fixedly provided with the shock absorption ring towards the front end cover, so that the shock absorption ring replaces the second piston to absorb the reaction force generated by the impact during the impact, and the durability of the piston is improved. The fixed snubber block that is equipped with the shock attenuation ring complex on the front end cap, when the striking, the snubber block replaces the impact force that the front end cap absorbed the second piston striking, and shock attenuation ring and snubber block are soft elastic material of texture simultaneously, and the soft contact has increased the buffering in the striking than hard contact to the loss that the striking brought has been reduced. The second piston is connected with a balancing weight, the weight of the balancing weight can be changed by replacing different materials, and therefore the effect of adjusting the speed of the firing pin is achieved.

Preferably, the locking assembly comprises a limiting sleeve which is fixedly installed on the tail end cover and matched with the clamping piece, a first through hole is formed in the side face of the limiting sleeve, a guide sleeve which is arranged towards the first through hole is fixedly arranged on the inner side of the tail end cover, a lock tongue which can only slide along the guide sleeve is arranged in the guide sleeve, a spring which can push one end of the lock tongue to penetrate through the first through hole and be embedded into the bayonet is arranged in the guide sleeve, an unlocking through hole is formed in the lock tongue, an unlocking inclined plane is formed in one side face of the unlocking through hole, a second through hole which corresponds to the unlocking through hole is formed in the guide sleeve, and a pushing inclined plane which is matched with. The spring bolt locks the second piston in the stop collar through locking joint spare, and such locking mode is comparatively stable, only when first piston motion to unblank ejector pin and the contact of unblanking through-hole, the inclined plane of unblanking contacts with promoting the inclined plane, and along with first piston continuation motion, the spring bolt separates with the bayonet socket, and the locking is removed to the second piston, and such unlocking mode, the atmospheric pressure of exerting on the second piston is comparatively stable unanimous when unblanking. And such structure is easily manufacturing, and the assembly is simple, easily realizes the function.

As preferred, afterbody end cover medial surface is equipped with stop collar mounting groove and hasp mounting groove, stop collar mounting groove side and hasp mounting groove intercommunication, the stop collar is fixed to be set up in the stop collar mounting groove, in the uide bushing embedding hasp mounting groove, uide bushing one end and the laminating of stop collar side, the uide bushing other end and the laminating of hasp mounting groove tip, afterbody end cover medial surface still is equipped with compresses tightly the clamp plate of fixing in the hasp mounting groove with the uide bushing, realizes dismantling fixed connection through the screw between clamp plate and the afterbody end cover. Set up stop collar mounting groove and hasp mounting groove in afterbody end cover inboard, the installation of stop collar and uide bushing is conveniently installed, only needs with in stop collar and the uide bushing embedding mounting groove. The uide bushing passes through one end and the laminating of stop collar side, and the other end carries out radial spacing with the assembly mode of hasp mounting groove tip laminating to the uide bushing, and it is spacing to the uide bushing not need additionally to set up the locating part like this, simplifies the installation. The guide sleeve is fixedly connected with the inner side surface of the tail end cover in a screw fastening pressing plate mode, so that the installation is convenient, and meanwhile, the maintenance and the replacement are convenient.

As preferred, the stop collar mounting groove runs through the afterbody end cover, the stop collar is including fixed connection's spacing ring, the cover body, double-screw bolt in proper order, and the spacing ring side is for the cover body is outwards protruding, spacing ring and the laminating of afterbody end cover medial surface, the double-screw bolt passes stop collar mounting groove and spiro union have the nut of laminating at afterbody end cover lateral surface, first through-hole setting is on the cover body, be equipped with first annular groove on the cover body, install first sealing washer in the first annular groove. When the limiting sleeve is installed, the stud only needs to penetrate through the tail end cover, the limiting part is attached to the inner side face of the tail end cover, and the stud is fixedly installed on the tail end cover through the nut on the outer side face of the tail end cover, so that the installation mode is simple; the design of first sealing washer guarantees the gas tightness of cylinder.

Preferably, the power assembly comprises a motor, a gearbox and a rack, a rotating shaft of the motor is connected with an input end of the gearbox, an output end of the gearbox is fixedly connected with a gear meshed with the rack, a first piston is fixedly connected with the rack and can reciprocate in a first cylinder along with the rack, two Hall sensors respectively positioned beside the front end and the rear end of the first cylinder are fixedly arranged in the casing, and a magnetic block matched with the Hall sensors is fixedly arranged on the first piston; the casing internal fixation is equipped with the circuit board that has the singlechip, the circuit board respectively with hall sensor, motor electric connection. The power assembly adopts a gear and rack transmission mode, the Hall sensor is used for detecting the position of the first piston, when the trigger is pulled, the Hall sensor can detect whether the position of a magnet of the first piston is at one end close to the front end cover, if not, the motor is controlled by the circuit board to rotate reversely, the rack drives the first piston to move towards the front end cover, and after the detection, the motor is controlled by the circuit board to rotate forwards, and the rack drives the first piston to move towards the tail end cover to compress gas; when the Hall sensor close to the tail end cover detects the magnetic block on the first piston, a signal is transmitted to the circuit board, the circuit board controls the motor to rotate reversely, and the rack drives the first piston to move towards the front end cover, so that the first piston reciprocates in the first cylinder.

Preferably, the power assembly comprises a motor, a gearbox and a connecting rod, a rotating shaft of the motor is connected with an input end of the gearbox, an output end of the gearbox is vertically and fixedly connected with a crank, one end of the connecting rod is rotatably connected with the outer end of the crank, and the other end of the connecting rod is hinged to the first piston. The first piston is driven to reciprocate in the first cylinder in a crank connecting rod transmission mode, and the first piston can be driven to reciprocate in the first cylinder without controlling the motor to rotate forwards and backwards additionally.

Preferably, the outer side of the damping ring is provided with a clamping groove of a circular ring structure, the piston body is fixedly provided with a clamping ring of the circular ring structure, and the clamping ring is embedded into the clamping groove. The damping ring is installed on the piston body in a mode that the clamping ring is clamped in the clamping groove, and the installation mode is simple and stable and is convenient to replace.

Preferably, the cylinder wall of the first cylinder is provided with a vent hole at a position close to the front end cover, and the cylinder wall of the second cylinder is provided with a vent hole at a position close to the front end cover. Through the design of the vent hole, when the first piston is positioned closest to the front end cover and does not start to compress gas, the space formed by the first piston, the tail end cover and the first cylinder is communicated with the outside air through the vent hole, so that the air pressure before gas compression is ensured to be consistent with the outside air pressure; when the first piston compresses gas in the cylinder, a space formed by the first piston, the front end cover and the first cylinder is communicated with the outside through the vent hole, and a low-pressure space formed by the first piston moving towards the tail end cover cannot block the movement of the first piston, so that the motor efficiency is improved; similarly, when the second piston does hammering movement after being unlocked, the second cylinder is connected with the outside through the vent hole, and compressed gas cannot be generated along with the movement of the second piston to block the movement of the second piston; and when the second piston collides with the front end cover, the second cylinder is communicated with the outside through the vent hole, high-pressure gas is decompressed through the vent hole, the air pressure in the second cylinder is consistent with the outside air pressure, and when the first cylinder conveniently moves towards the front end cover, the air pressure of the second cylinder, which is smaller than the outside air pressure, enables the second piston to return to the tail end cover.

Preferably, a second sealing ring is arranged between the tail end cover and the first cylinder, and a second annular groove for mounting the second sealing ring is formed in the tail end cover. The design of the second sealing ring ensures the air tightness between the tail end cover and the first cylinder.

Compared with the prior art, the invention has the following beneficial effects:

1. the first cylinder and the second cylinder share the end cover, and the integrated design simplifies the installation steps and improves the assembly efficiency; 2. the cylinder is fixedly connected with the end cover through the bolt, so that the cylinder is convenient to mount and dismount, the sealing treatment on the end cover is simple and convenient, and the sealing effect is good; 3. a lock catch assembly is arranged on the tail end cover to control the locking of the second piston, and the unlocking ejector rod arranged on the first piston is used for unlocking the second piston, so that the mode is convenient and fast, and the consistency is high; 4. the second piston is provided with a damping ring which is matched with a damping block on the front end cover for use, so that the durability of the piston is improved, and the loss speed of the damping block is reduced; 5. the second piston is provided with a balancing weight, and the nail shooting force is controlled by changing the weight of the balancing weight; 6. the lock catch assembly is arranged on the inner side of the tail end cover, and the sealing ring is additionally arranged at the sleeve body of the limiting sleeve, so that the installation is convenient, and the sealing effect is good.

Drawings

FIG. 1 is a perspective view of a pneumatic nailer of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an enlarged view of a portion I of FIG. 2;

FIG. 4 is a cross-sectional view of the second piston;

FIG. 5 is a perspective view of the stop collar;

FIG. 6 is a perspective view of the latch;

FIG. 7 is a cross-sectional view of the latch;

FIG. 8 is a perspective view of the trailing end cap 10;

FIG. 9 is a partial view of embodiment 2 of the present invention;

the labels in the figure are: 1. a machine shell, 2, a motor, 3, a power assembly 5, a trigger, 6, a position detection plate, 7, a Hall sensor, 8, a magnetic block, 9, a first piston, 10, a tail end cover, 11, a lock catch assembly, 12, an unlocking ejector rod, 13, a first air cylinder, 14, a second air cylinder, 15, a second piston, 16, a shock absorption ring, 17, a shock absorption block, 18, a firing pin, 19, a front end cover, 20, a rack, 21, a gear, 22, a nailing nozzle, 23, a nail feeding assembly, 24, a gearbox, 25, a circuit board, 26, a spring, 27, a guide sleeve, 28, a pressing plate, 29, a limit sleeve, 30, a clamping piece, 31, a bayonet, 32, a piston core, 33, a piston body, 34, a balancing weight, 35, a buffer sleeve strip, 36, a clamping groove, 37, a clamping ring, 38, a limit ring, 39, 40, a stud, 41, a first through hole, 42, a first annular groove, 43 and a bolt, 44. the locking device comprises a second through hole, 45, an unlocking through hole, 46, an unlocking inclined plane, 47, a push rod guide supporting plate, 48, a pushing inclined plane, 49, a second annular groove, 50, a vent groove, 51, a limiting sleeve mounting groove, 52, a locking mounting groove, 53, a nut, 54, a first sealing ring, 55, a second sealing ring, 56, a bumper, 57, a vent hole, 58, a crank, 59 and a connecting rod.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which: