Fastener driving tool

Abstract

The utility model discloses a fastener driving tool, which belongs to the technical field of electric tools, and comprises a support cylinder, a striking unit with a driving piston and a striking piece, a driving air chamber communicated with displacement volume fluid, a lifting component used for driving the striking unit to move towards a first direction, and an air supply unit arranged in the support cylinder, the air supply unit comprises an air supply piston and an air supply chamber. And in the process that the striking unit moves towards the second direction, the volume of the air supply chamber is reduced, and air in the air supply chamber can enter the driving air chamber. In the process that the beating unit moves in the first direction, the size of the air supplementing chamber is increased, and external air can enter the air supplementing chamber. And the purpose of supplementing air to the driving air chamber is achieved through the additionally arranged air supplementing unit, and the nailing effect can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field especially relates to a fastener driving tool. BACKGROUND

[0002] The nail gun is a kind of handheld driving tool, which drives nails into wood and other workpieces by the rapid movement of the striker. The traditional pneumatic nail gun generally adopts a double-cylinder double-piston structure. After the large piston in the large cylinder moves and compresses the air in the large cylinder to a certain extent, the piston in the small cylinder is released. The compressed air in the large cylinder flows into the small cylinder through the airflow channel and drives the small piston in the small cylinder to move. The moving small piston drives the striker to move synchronously, so that the striker drives nails into wood and other workpieces, thereby achieving the purpose of driving nails. The traditional pneumatic nail gun generally uses a crank connecting rod structure to drive the large piston to move back and forth. Since the crank connecting rod structure has a large force deflection angle during reciprocating motion, the crank connecting rod structure is prone to unstable thrust and large load bias when driving the large piston to compress the gas, thereby causing the large piston to be prone to jamming during gas compression.

[0003] Based on the above situation, some pneumatic nail guns (such as US11034007B2 and its prior art) use a single-piston single-chamber structure. The gas storage chamber is filled with high-pressure gas. The upward moving piston extrudes the gas in the gas storage chamber. The extruded high-pressure gas in the gas storage chamber can be used as a gas spring to drive the piston to drive the striker to move rapidly, thereby driving nails into the workpiece. Since the gas storage chamber inevitably has gas leakage, after the pneumatic nail gun is used for a period of time, the gas pressure of the gas in the gas storage chamber under the extrusion state will decrease, and the driving effect of the extruded gas on the piston and the striker will also decrease, ultimately resulting in unsatisfactory driving effect, which is not conducive to ensuring the user's experience. SUMMARY

[0004] To solve the above-mentioned shortcomings and deficiencies in the prior art, the utility model provides a fastener driving tool, which realizes the purpose of supplementing the driving gas chamber by the added air supplementing unit, and is conducive to ensuring the driving effect.

[0005] To achieve the above technical purpose, the fastener driving tool provided by the utility model comprises:

[0006] The support cylinder has two axial ends respectively arranged towards the first direction and the second direction;

[0007] The driving piston is axially movable in the support cylinder, and the support cylinder has a displacement volume generated by the stroke of the driving piston. One end of the striker towards the first direction is connected with the driving piston, and the other end towards the second direction can contact the fastener to be struck.

[0008] a driving gas chamber in fluid communication with the displacement volume, high pressure gas in the driving gas chamber can drive the striking unit to move in the second direction;

[0009] a lifting assembly for driving the striking unit to move in the first direction;

[0010] a gas supplement unit arranged in the supporting cylinder, the gas supplement unit comprising a gas supplement piston and a gas supplement chamber, the gas supplement piston being connected to the striking member and located in the second direction of the driving piston, the gas supplement chamber being located between the driving piston and the gas supplement piston, the gas supplement piston being movable relative to the striking member within a range so that the volume of the gas supplement chamber is variable;

[0011] during the movement of the striking unit in the second direction, the volume of the gas supplement chamber is reduced and the gas in the gas supplement chamber can enter the driving gas chamber;

[0012] during the movement of the striking unit in the first direction, the volume of the gas supplement chamber is increased and the external air can enter the gas supplement chamber.

[0013] Preferably, the driving piston is provided with a gas supplement hole and a gas supplement one-way valve for opening and closing the gas supplement hole, the gas supplement one-way valve opening the gas supplement hole when the gas pressure in the gas supplement chamber is higher than the gas pressure in the driving gas chamber.

[0014] Preferably, the gas supplement piston is provided with an air inlet hole and an air inlet one-way valve for opening and closing the air inlet hole, the air inlet one-way valve opening the air inlet hole when the gas pressure of the external air is higher than the gas pressure in the gas supplement chamber.

[0015] Preferably, the fastener driving tool further comprises a pressure relief valve for adjusting the gas pressure in the driving gas chamber, the pressure relief valve opening when the gas pressure in the driving gas chamber exceeds a predetermined pressure relief value.

[0016] Preferably, one end of the supporting cylinder in the second direction is provided with an elastic shock-absorbing block, the striking unit continues to move in the second direction after the gas supplement piston contacts the shock-absorbing block, so that the volume of the gas supplement chamber is compressed.

[0017] Preferably, the striking unit moves in the first direction before the gas supplement piston, and the volume of the gas supplement chamber is increased during the movement of the striking unit in the first direction before the gas supplement piston.

[0018] Preferably, the gas supplement piston is sleeved on the striking member, the striking member is provided with a limiting portion for limiting the gas supplement piston, and the gas supplement piston is movable relative to the striking member between the driving piston and the limiting portion.

[0019] Preferably, the striking member moving in the first direction can drive the gas supplement piston to move synchronously through the limiting portion; and / or, the striking member is provided with a supporting portion thinner than the limiting portion between the driving piston and the limiting portion, the gas supplement piston is sleeved on the supporting portion, and a sealing ring is arranged between the supporting portion and the gas supplement piston to keep a circumferential sealing fit therebetween.

[0020] Preferably, the driving piston is in circumferential sealing engagement with the support cylinder; and / or, the air supplementing piston is in circumferential sealing engagement with the support cylinder.

[0021] Preferably, the driving gas chamber is arranged around at least part of the support cylinder, and at least part of the driving gas chamber is above the support cylinder.

[0022] After the above technical scheme, the utility model has the advantages of:

[0023] 1、 the fastener driving tool of the utility model, the structure is improved, the air supplementing unit including air supplementing piston and air supplementing gas chamber is additionally provided, the air supplementing piston is connected to the striker, the air supplementing gas chamber is located between the driving piston and the air supplementing piston, since the air supplementing piston is movable within a certain range relative to the striker, the air supplementing piston in motion can change the volume of the air supplementing gas chamber. During the process that the striker moves in the second direction to drive the nail, the volume of the air supplementing gas chamber is reduced, and correspondingly, the air pressure in the air supplementing gas chamber is increased, since the volume of the driving gas chamber gradually increases during the process that the striker moves in the second direction, the air pressure in the driving gas chamber gradually decreases, when the air pressure in the air supplementing gas chamber is greater than the air pressure in the driving gas chamber, the gas in the air supplementing gas chamber can enter the driving gas chamber under the action of the pressure difference. During the process that the striker moves in the first direction to store energy, the volume of the driving gas chamber gradually decreases, that is, the air pressure in the driving gas chamber gradually increases, in addition, the volume of the air supplementing gas chamber increases, and correspondingly, the air pressure in the air supplementing gas chamber decreases, when the air pressure of the external air is greater than the air pressure in the air supplementing gas chamber, the external air can enter the air supplementing gas chamber under the action of the pressure difference, and the gas entering the air supplementing gas chamber can be pressed into the driving gas chamber when the striker drives the nail next time. The air supplementing unit is additionally provided to achieve the purpose of supplementing the driving gas chamber, ensure the air pressure intensity of the gas in the driving gas chamber in the extruded state, thereby ensuring the driving force of the extruded gas in the driving gas chamber to the striker when the striker drives the nail, and further ensuring the driving effect, which is conducive to improving the user's experience.

[0024] In addition, since the driving gas chamber can be inflated by the air supplementing unit, the tool can not be pre-charged with high-pressure gas in the driving gas chamber when it is shipped, or only a part of the high-pressure gas is pre-charged in the driving gas chamber, the driving gas chamber is inflated by the air supplementing unit before driving the nail, and the tool is used to drive the nail when the air pressure in the driving gas chamber meets the driving requirement, which can reduce or eliminate the risk of explosion of the tool caused by pre-charging high-pressure gas in the driving gas chamber. In addition, since the tool can not be pre-charged with high-pressure gas in the driving gas chamber when it is shipped, or only a part of the high-pressure gas is pre-charged in the driving gas chamber, other related components of the tool are in an unloaded state or a small load state, which is conducive to ensuring the performance and service life of the other related components.

[0025] 2、The driving piston is provided with a gas supplement hole and a gas supplement check valve, the gas supplement check valve closes the gas supplement hole in normal state, during the movement of the striking unit in the second direction, when the gas pressure in the gas supplement chamber is higher than that in the driving gas chamber, the gas supplement check valve opens the gas supplement hole under the action of the gas pressure difference, and the gas in the gas supplement chamber can enter the driving gas chamber through the gas supplement hole. The specific structure of the driving piston is reasonably set, so that the gas in the gas supplement chamber can enter the driving gas chamber under the action of the gas pressure difference, and the purpose of supplementing the driving gas chamber is achieved.

[0026] 3、The gas supplement piston is provided with an air inlet hole and an air inlet check valve, the air inlet check valve closes the air inlet hole in normal state, during the movement of the striking unit in the first direction, when the gas pressure of the external air is higher than that in the gas supplement chamber, the air inlet check valve opens the air inlet hole under the action of the gas pressure difference, and the external air can enter the gas supplement chamber through the air inlet hole. The specific structure of the gas supplement piston is reasonably set, so that the external air can enter the gas supplement chamber under the action of the gas pressure difference, and the gas in the gas supplement chamber can finally enter the driving gas chamber.

[0027] 4、The tool is provided with a pressure relief valve for adjusting the gas pressure in the driving gas chamber, the pressure relief valve is in a normally closed state, when the gas pressure in the driving gas chamber exceeds the predetermined pressure relief value, the pressure relief valve opens, and the gas in the driving gas chamber can be discharged from the driving gas chamber through the pressure relief valve, thereby avoiding the situation that the driving gas chamber explodes due to excessive gas pressure, and ensuring the safety of the tool while ensuring the effect of driving.

[0028] 5、One end of the support cylinder is provided with a damping block, during the movement of the striking unit in the second direction, after the gas supplement piston contacts the damping block and stops moving, the striking unit continues to move in the second direction, that is, the driving piston continues to move and approaches the gas supplement piston after the gas supplement piston stops, at this time, the gas supplement chamber between the driving piston and the gas supplement piston is sharply pressed, accordingly, the gas pressure in the gas supplement chamber sharply increases and can reach a state higher than the gas pressure in the driving gas chamber, and the gas in the gas supplement chamber can enter the driving gas chamber under the condition of sharp increase of the gas pressure. In addition, the volume reduction of the gas supplement chamber can provide a certain buffering effect to the striking piece, which can greatly reduce the vibration of the tool during driving, and is beneficial to improve the user experience.

[0029] 6、During the movement of the striking unit in the first direction, the striking unit moves before the gas supplement piston, the volume of the gas supplement chamber increases under the condition that the driving piston moves first, accordingly, the gas pressure in the gas supplement chamber decreases and can reach a state lower than the external atmospheric pressure, at this time, the external air can enter the gas supplement chamber under the action of the gas pressure difference.

[0030] 7. The striking component is provided with a limiting part. The air replenishing piston is sleeved on the striking component and can move between the driving piston and the limiting part relative to the striking component. The driving piston and the limiting part restrict the axial position of the air replenishing piston, so that the air replenishing piston can move within a certain range relative to the striking component. The striking component moving in the first direction can drive the air replenishing piston to move together through the limiting part.

[0031] 8. The air replenishing piston is sleeved on the support part of the striking part. The support part and the air replenishing piston are circumferentially sealed by a sealing ring to prevent the gas in the air replenishing chamber from leaking out through the assembly gap between the support part and the air replenishing piston when the volume of the air replenishing chamber is reduced, thereby ensuring the air replenishing effect of the air replenishing chamber on the driving chamber. Attached Figure Description

[0032] Figure 1 This is a complete machine diagram of the fastener driving tool in Embodiment 1;

[0033] Figure 2 This is a schematic diagram of the fastener not being driven into the workpiece in Example 1;

[0034] Figure 3 This is a schematic diagram of the fastener after it has been driven into the workpiece in Example 1;

[0035] Figure 4 This is a partial structural diagram of the fastener driving tool in Embodiment 1;

[0036] Figure 5 This is an axial sectional view of the striking unit, the air supply unit, and the cylinder unit in Embodiment 1;

[0037] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0038] Figure 7 This is a partial structural diagram of the striking component in Example 1;

[0039] Figure 8 This is a structural diagram of the driving piston in Example 1;

[0040] Figure 9 This is a structural diagram of the gas-injecting piston in Example 1;

[0041] Figure 10a , Figure 10b , Figure 10c , Figure 10d , Figure 10e This is a schematic diagram of some structures in different states during the nailing cycle;

[0042] Figure 11 This is an exploded view of part of the structure in Example 1;

[0043] Figure 12Fig. 6 is a sectional view of the support base, guide base and striker along the front-rear direction in Embodiment 1;

[0044] Figure 13 Fig. 7 is a schematic view of the engagement of the lifting gear and striker in Embodiment 1;

[0045] Figure 14 Fig. 8 is an exploded view of the lifting assembly in Embodiment 1;

[0046] Figure 15 Fig. 9 is a view of the engagement of the partial structure of the lifting assembly and the lock catch in Embodiment 1;

[0047] Figure 16 Fig. 10 is an axial sectional view of the partial structure of the lifting assembly in Embodiment 1;

[0048] Figure 17 Fig. 11 is a view of the engagement of the driving gear and driven gear in Embodiment 1;

[0049] Figure 18 Fig. 12 is a view of the structure of the driving gear in Embodiment 1;

[0050] Figure 19 Fig. 13 is a view of the engagement of the cam and lock catch in Embodiment 1;

[0051] Figure 20 Fig. 14 is a view of the engagement of the lock catch and in-place switch in Embodiment 1;

[0052] Figure 21 Fig. 15 is an exploded view of the safety assembly and guide base in Embodiment 1;

[0053] Figure 22 Fig. 16 is an axial sectional view of the partial structure when the cylinder unit adopts a special shape in Embodiment 1.

[0054] In the figure, 10 - fastener driving tool,

[0055] 2A - hitting unit, 21 - drive piston, 211 - connecting hole, 212 - air supplement hole, 213 - air supplement one-way valve, 214 - first mounting hole, 215 - first step surface, 216 - sealing ring IV, 217 - first limit sheet, 22 - hitting piece, 221 - connecting part, 222 - support part, 223 - limit part, 23 - support cylinder, 23A - displacement volume, 24 - drive gas chamber, 2B - air supplement unit, 25 - air supplement piston, 251 - sleeve hole, 252 - air inlet hole, 253 - air inlet one-way valve, 254 - second mounting hole, 255 - second step surface, 256 - sealing ring V, 257 - second limit sheet, 26 - air supplement gas chamber, 27 - cylinder unit, 271 - cylinder shell, 272 - cylinder cover, 273 - base, 274 - pressure relief valve, 2741 - valve shell, 2742 - valve cover, 2743 - valve rod, 2744 - spring, 2745 - cavity, 2746 - exhaust hole, 275 - pressure relief hole, 276 - inflation valve, 275 - pressure relief hole, 28 - damping block, 281 - through hole, 291 - sealing ring I, 292 - sealing ring II,

[0056] 31 - fastener, 32 - workpiece,

[0057] 40 - lifting assembly, 41 - lifting gear, 42 - transmission shaft, 43 - motor, 44 - speed reducer, 441 - output shaft, 451 - driving wheel, 4511 - concave cavity, 452 - driven wheel, 461 - transmission ratchet groove, 462 - transmission ratchet, 463 - first spring,

[0058] 50 - machine shell, 51 - main body part, 52 - containing part, 53 - handle part, 54 - receiving part, 55 - reinforcing part,

[0059] 61 - support seat, 62 - rod shaft, 63 - guide seat, 64 - limit channel, 65 - guide channel, 66 - trigger,

[0060] 71 - lock block, 72 - second spring, 73 - cam, 74 - in-place switch, 75 - pin rod,

[0061] 80 - nail feeding device, 81 - guide cover,

[0062] 90 - safety assembly, 91 - top rod, 92 - safety switch, 93 - third spring, 94 - contact piece, 95 - positioning frame, 96 - elastic member. DETAILED DESCRIPTION

[0063] It is to be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and other similar terms indicating orientation or positional relationships as used herein are based on the orientation or positional relationships shown in the drawings and are used only for the purpose of describing the present application and simplifying the description, and do not indicate or imply that the device / element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0064] Embodiment one

[0065] In combination Figures 1 to 21 , the fastener driving tool 10 provided by the embodiment one of the present application comprises:

[0066] The support cylinder 23 has two axial ends respectively arranged towards the first direction and the second direction;

[0067] The striking unit 2A has the driving piston 21 and the striking member 22, wherein the driving piston 21 is axially movable in the support cylinder 23, the support cylinder 23 has a displacement volume 23A generated by the stroke of the driving piston 21, one end of the striking member 22 towards the first direction is connected with the driving piston 21, and the other end of the striking member 22 towards the second direction is capable of contacting the fastener 31 to be struck;

[0068] The driving gas chamber 24 is in fluid communication with the displacement volume 23A, and the high-pressure gas in the driving gas chamber 24 can drive the striking unit 2A to move towards the second direction;

[0069] The lifting assembly 40 is used to drive the striking unit 2A to move towards the first direction;

[0070] The air supplement unit 2B is arranged in the support cylinder 23, the air supplement unit 2B comprises the air supplement piston 25 and the air supplement gas chamber 26, the air supplement piston 25 is connected with the striking member 22 and located at the second direction of the driving piston 21, the air supplement gas chamber 26 is located between the driving piston 21 and the air supplement piston 25, and the air supplement piston 25 is movable relative to the striking member 22 within a certain range so that the volume of the air supplement gas chamber 26 is variable;

[0071] During the movement of the striking unit 2A towards the second direction, the volume of the air supplement gas chamber 26 is reduced, and the gas in the air supplement gas chamber 26 can enter the driving gas chamber 24;

[0072] During the movement of the striking unit 2A towards the first direction, the volume of the air supplement gas chamber 26 is increased, and the external air can enter the air supplement gas chamber 26.

[0073] The air supplement unit 2B is added to supplement the air in the driving air chamber 24, to ensure the air pressure of the air in the driving air chamber 24 in the extruded state, so as to ensure the driving force of the extruded air in the driving air chamber 24 to the hitting unit 2A, and further ensure the effect of driving nails, which is beneficial to improve the user experience. In addition, since the air supplement unit 2B can be used to supplement the air in the driving air chamber, the tool can not be pre-charged with high-pressure gas in the driving air chamber 24 when it is shipped, or only a part of the high-pressure gas is pre-charged in the driving air chamber 24. Before driving nails, the driving air chamber 24 is first inflated by the air supplement unit 2B, and then the tool is used to drive nails when the air pressure in the driving air chamber 24 meets the requirements of driving nails. In this way, the risk of explosion of the tool caused by pre-charging high-pressure gas in the driving air chamber 24 can be reduced or eliminated. Furthermore, since the tool can not be pre-charged with high-pressure gas in the driving air chamber 24 when it is shipped, or only a part of the high-pressure gas is pre-charged in the driving air chamber 24, other related components of the tool are in an unloaded state or a small load state, which is beneficial to ensure the performance and service life of other related components.

[0074] In the embodiment, the axis of the support cylinder 23 is arranged in the up-down direction, and one end of the support cylinder 23 is arranged upward and the other end is arranged downward. Figure 1 The fastener driving tool 10 further comprises a housing 50, which is preferably in a left-right split housing structure. The housing 50 forms a main body 51, a receiving portion 52 and a handle portion 53. The main body 51 extends in the up-down direction. The receiving portion 52 extends rearward from the lower part of the main body 51 and is used to accommodate part of the lifting assembly 40. The handle portion 53 extends rearward from the upper part of the main body 51 and is used for the user to hold. The handle portion 53 and the receiving portion 52 have a certain gap in the up-down direction. The fastener driving tool 10 of the embodiment is preferably powered by a battery pack, which is preferably detachably mounted. The rear end of the handle portion 53 forms a receiving portion 54 for mounting the battery pack.

[0075] In combination with Figure 5In the embodiment, the fastener driving tool 10 further comprises a cylinder unit 27. Specifically, the cylinder unit 27 comprises a cylinder shell 271, a cylinder cover 272 and a base 273. The base 273 is fixed in the main body 51. The support cylinder 23 is hollow and open at both ends. The lower end of the support cylinder 23 is fixed on the base 273 and is in circumferential sealing cooperation with the base 273. The cylinder shell 271 is also hollow and open at both ends. The cylinder shell 271 is spacedly sleeved on the outer periphery of the support cylinder 23. The lower end of the cylinder shell 271 is fixed on the base 273 and is in circumferential sealing cooperation with the base 273. The cylinder cover 272 is fixed on the upper end of the cylinder shell 271 and is in circumferential sealing cooperation with the cylinder shell 271. The top surface of the support cylinder 23 is lower than the bottom surface of the cylinder cover 273, so that there is a certain axial gap between the upper end of the support cylinder 23 and the cylinder cover 273, so that part of the driving air chamber 24 is located above the support cylinder 23. The lower end of the support cylinder 23 is provided with a damping block 28 located on the inner periphery of the base 273. The damping block 28 is made of elastic material such as rubber. The damping block 28 can limit the limit position of the striking unit 2A when moving in the second direction. The center of the damping block 28 is provided with a through hole 281 for the striker 22 to pass through. The driving piston 21 is movably arranged in the support cylinder 23. The outer periphery of the driving piston 21 is axially positioned and sleeved with a plurality of spaced sealing rings I 291. The sealing ring I 291 is in contact with the inner surface of the support cylinder 23. The driving piston 21 and the support cylinder 23 are in circumferential sealing cooperation through the sealing ring I 291. The driving air chamber 24 is formed by the cylinder unit 27, the support cylinder 23 and the driving piston 21. The volume of the driving air chamber 24 changes with the movement of the driving piston 21. As a preferred scheme of the embodiment, the support cylinder 23 and the cylinder shell 271 are both hollow cylindrical. The central axes of the support cylinder 23 and the cylinder shell 271 are substantially coincident. The driving air chamber 24 is arranged around the support cylinder 23. In other schemes of the embodiment, the cylinder shell 271 can also be hollow square cylinder, elliptical cylinder or other reasonable shape. In addition, the central axes of the support cylinder 23 and the cylinder shell 271 can be arranged at a distance, i.e. the central axes of the support cylinder 23 and the cylinder shell 271 can not be coincident. In addition, the axial length of the cylinder shell 271 can be less than the axial length of the support cylinder 23. At this time, the driving air chamber 24 is arranged around part of the support cylinder 23. It can be understood that the cylinder shell 271 and the cylinder cover 272 of the cylinder unit 27 can be integrally formed. Of course, the specific structure of the cylinder unit 27 is not limited to the foregoing description and the drawings. The cylinder unit 27 can also adopt other cylinder structures that can form the driving air chamber 24.

[0076] The upper part of the striker 22 passes through the damping block 28 from the through hole 281 and extends into the support cylinder 23 and is connected with the driving piston 21. Specifically, the driving piston 21 is provided with a connection hole 211 which is closed at the upper end and open at the lower end. The striker 22 is connected with the driving piston 21 through the connection hole 211. The driving piston 21 is connected with the driving rod 25 through the driving rod connecting hole 212. Figure 7The upper end of the striking member 22 is provided with a connecting portion 221 matched with the connecting hole 211, and the connecting portion 221 is inserted into the connecting hole 211. The upper end of the striking member 22 and the driving piston 21 can be connected by thread cooperation or pin shaft cooperation, so that the driving piston 21 and the striking member 22 of the striking unit 2A can move synchronously.

[0077] In combination Figure 7 In the embodiment, the upper end of the striking member 22 is further provided with a supporting portion 222 and a limiting portion 223, the connecting portion 221, the supporting portion 222 and the limiting portion 223 are sequentially distributed from top to bottom, and the outer diameters of the three portions are sequentially increased. The air supplement piston 25 is provided with a sleeve hole 251 matched with the supporting portion 222 in clearance, and the air supplement piston 25 is sleeved on the upper part of the striking member 22 through the sleeve hole 251 matched with the supporting portion 222, and the air supplement piston 25 is located below the driving piston 21. Further, the axial height H1 of the supporting portion 222 is greater than the axial height H2 of the air supplement piston 25, and the air supplement piston 25 can move up and down relative to the supporting portion 222. The outer diameter of the limiting portion 223 is greater than the inner diameter of the sleeve hole 251, and the stroke of the air supplement piston 25 moving up and down relative to the supporting portion 222 is limited by the driving piston 21 and the limiting portion 223, so that the air supplement piston 25 can move up and down within a certain height range relative to the striking member 22.

[0078] The air supplement chamber 26 is formed by the driving piston 21, the air supplement piston 25 and the supporting cylinder 23. In order to ensure the sealing performance of the air supplement chamber 26, a plurality of interval distributed sealing rings Ⅱ 292 are sleeved on the outer periphery of the air supplement piston 25 in the axial direction, the sealing rings Ⅱ 292 are in contact with the inner surface of the supporting cylinder 23, and the air supplement piston 25 and the supporting cylinder 23 are kept in circumferential sealing cooperation through the sealing rings Ⅱ 292. In addition, the outer periphery of the supporting portion 222 is sleeved with the sealing ring Ⅲ 293 positioned in the axial direction, the sealing ring Ⅲ 293 is in contact with the hole wall of the sleeve hole 251, and the air supplement piston 25 and the supporting portion 222 are kept in circumferential sealing cooperation through the sealing ring Ⅲ 293.

[0079] In combination Figure 8The driving piston 21 is provided with a supplementary air hole 212 and a supplementary air one-way valve 213 for opening and closing the supplementary air hole 212. When the air pressure in the supplementary air chamber 26 is higher than that in the driving air chamber 24, the supplementary air one-way valve 213 opens the supplementary air hole 212, so that the gas in the supplementary air chamber 26 can smoothly enter the driving air chamber 24. Specifically, the driving piston 21 is provided with a first mounting hole 214 with a large upper part and a small lower part. The first mounting hole 214 extends downward from the upper surface of the driving piston 21 to a certain depth. The supplementary air hole 212 extends upward from the lower surface of the driving piston 21 to a certain depth. The supplementary air hole 212 and the first mounting hole 214 are in communication with each other. The diameter of the first mounting hole 214 is larger than that of the supplementary air hole 212, and a first step surface 215 is formed between the first mounting hole 214 and the supplementary air hole 212. The supplementary air one-way valve 213 is substantially columnar with a large upper part and a small lower part. The supplementary air one-way valve 213 is movably arranged in the first mounting hole 214. The outer diameter of the supplementary air one-way valve 213 is slightly smaller than that of the first mounting hole 214 and larger than that of the supplementary air hole 212. The axial height of the supplementary air one-way valve 214 is smaller than the depth of the first mounting hole 214. A sealing ring IV 216 is arranged on the outer periphery of the supplementary air one-way valve 214 in an axial direction. When the air pressure in the supplementary air chamber 26 is higher than or equal to that in the driving air chamber 24, the supplementary air one-way valve 213 is pressed against the first step surface 215 under the action of the air pressure in the driving air chamber 24. At this time, the bottom surface of the supplementary air one-way valve 213 is pressed against the first step surface 215 to close the supplementary air hole 212. The sealing ring IV 216 is in contact with the hole wall of the first mounting hole 214 to achieve the circumferential sealing between the supplementary air one-way valve 213 and the driving piston 21. When the air pressure in the supplementary air chamber 26 is higher than that in the driving air chamber 24, the supplementary air one-way valve 213 moves upward relative to the driving piston 21 under the action of the pressure difference. The bottom surface of the supplementary air one-way valve 213 moves upward away from the first step surface 215 to open the supplementary air hole 212. At the same time, the sealing ring IV 216 that moves upward with the supplementary air one-way valve 213 is not in contact with the hole wall of the first mounting hole 214, that is, there is a certain circumferential gap between the supplementary air one-way valve 213 and the hole wall of the first mounting hole 214. The gas in the supplementary air chamber 26 can enter the driving air chamber 24 through the opened supplementary air hole 212 and the circumferential gap, thereby achieving the air supplement of the driving air chamber 24. In addition, in order to avoid that the upwardly moving supplementary air one-way valve 213 moves away from the first mounting hole 214, the driving piston 21 is provided with a first limiting piece 217 at the top of the first mounting hole 214 for limiting the supplementary air one-way valve 213. The supplementary air one-way valve 213 that moves upward relative to the driving piston 21 moves to the first limiting piece 217 at most. Of course, the supplementary air one-way valve 213 can also adopt other existing one-way valve structures that meet the air supplement requirements. The specific structure of the supplementary air one-way valve 213 is not limited in the embodiment.

[0080] In combination Figure 9The air inlet hole 252 and the air inlet one-way valve 253 are arranged on the air supplement piston 25. The air inlet one-way valve 253 opens the air inlet hole 252 when the air pressure of the external air is higher than the air pressure in the air supplement chamber 26, so that the external air can smoothly enter the air supplement chamber 26. Specifically, the air supplement piston 25 is provided with a second mounting hole 254 which is thick at the top and thin at the bottom and extends downward from the upper surface of the air supplement piston 25 to a certain depth. The air inlet hole 252 extends upward from the lower surface of the air supplement piston 25 to a certain depth. The air inlet hole 252 and the second mounting hole 254 are in communication with each other. The diameter of the second mounting hole 254 is larger than the diameter of the air inlet hole 252, and a second step surface 255 is formed between the second mounting hole 254 and the air inlet hole 252. The air inlet one-way valve 253 is roughly columnar and thick at the top and thin at the bottom. The air inlet one-way valve 253 is arranged in the second mounting hole 254 and can move up and down. The outer diameter of the air inlet one-way valve 253 is slightly smaller than the diameter of the second mounting hole 254 and larger than the diameter of the air inlet hole 252. The axial height of the air inlet one-way valve 253 is smaller than the depth of the second mounting hole 254. A sealing ring V 256 is arranged on the outer periphery of the air inlet one-way valve 253. When the air pressure in the air supplement chamber 26 is higher than or equal to the air pressure of the external air, the air inlet one-way valve 253 is pressed against the second step surface 255 under the action of the air pressure in the air supplement chamber 26. At this time, the bottom surface of the air inlet one-way valve 253 is pressed against the second step surface 255 to close the air inlet hole 252. The air inlet hole 252 is in contact with the hole wall of the second mounting hole 254, so that the air inlet one-way valve 253 and the air supplement piston 25 are in a circumferential sealing state. When the atmospheric pressure of the external air is higher than the air pressure in the air supplement chamber 26, the air inlet one-way valve 253 moves upward relative to the air supplement piston 25 under the action of the pressure difference. The bottom surface of the air inlet one-way valve 253 moves upward away from the second step surface 255 to open the air inlet hole 252. At the same time, the sealing ring V 256 which moves upward with the air inlet one-way valve 253 is not in contact with the hole wall of the second mounting hole 254, that is, there is a certain circumferential gap between the air inlet one-way valve 253 and the hole wall of the second mounting hole 254. The external air can enter the air supplement chamber 26 through the opened air inlet hole 252 and the circumferential gap, so as to realize the air inlet of the air supplement chamber 26. In addition, in order to avoid that the upward moving air inlet one-way valve 253 is separated from the second mounting hole 254, the air supplement piston 25 is provided with a second limiting piece 257 at the top of the second mounting hole 254 for limiting the air inlet one-way valve 253. The air inlet one-way valve 253 which moves upward relative to the air supplement piston 25 moves to the second limiting piece 257 at most. Of course, the air inlet one-way valve 253 can also adopt other existing one-way valve structures which meet the air inlet requirements. The specific structure of the air inlet one-way valve 253 is not limited in the embodiment.

[0081] In combination Figure 6In the embodiment, in order to ensure the driving effect and the safety of the tool, the cylinder unit 27 is further provided with a pressure relief valve 274 for adjusting the air pressure in the driving air chamber 24. The pressure relief valve 274 is opened when the air pressure in the driving air chamber 24 exceeds a predetermined pressure relief value P0. Specifically, the cylinder cover 272 is provided with a pressure relief hole 275, and the pressure relief valve 274 is arranged on the cylinder cover 272 and used for opening and closing the pressure relief hole 275. Further, the pressure relief valve 274 includes a valve shell 2741, a valve cover 2742, a valve rod 2743, and a spring 2744. The valve shell 2741 and the valve cover 2742 are detachably fixed together by thread cooperation or the like and form a cavity 2745. The valve rod 2743 is movably arranged in the cavity 2745 and protrudes out of the cavity 2745 at one end thereof toward the pressure relief hole 275. The one end of the valve rod 2743 toward the pressure relief hole 275 is conical or spherical to effectively open and close the pressure relief hole 275. The spring 2744 is sleeved on the valve rod 2743 and positioned at one end thereof and in contact with the valve rod 2743 at the other end. The spring 2744 is in a compressed state and biases the valve rod 2743 toward the direction of closing the pressure relief hole 275. The predetermined pressure relief value P0 of the driving air chamber 24 depends on the biasing force of the spring 2744 applied to the valve rod 2743. When the air pressure in the driving air chamber 24 is less than or equal to the predetermined pressure relief value P0, the valve rod 2743 is closed under the biasing action of the spring 2744. When the air pressure in the driving air chamber 24 exceeds the predetermined pressure relief value P0, the valve rod 2743 moves toward the direction of opening the pressure relief hole 275 against the biasing of the spring 2744 under the action of the air pressure in the driving air chamber 24, so that the pressure relief hole 275 is opened, and the gas in the driving air chamber 24 can be discharged out of the driving air chamber 24 through the pressure relief hole 275. In order to smoothly discharge the gas in the driving air chamber 24, the valve shell 2741 and the valve cover 2742 of the pressure relief valve 274 are both provided with exhaust holes 2746, so that the gas discharged from the pressure relief hole 275 can be discharged outwards through the exhaust holes 2746 and the cavity 2745 of the pressure relief valve 274. The pressure relief valve 274 can be detachably installed on the cylinder cover 272 by thread cooperation or the like, or can be directly fixed on the cylinder cover 272. As an alternative to the embodiment, the pressure relief valve 274 can also be arranged on the cylinder shell 271 or the base 273 of the cylinder unit 27. Of course, the pressure relief valve 274 can also adopt other existing valve structures that meet the pressure relief requirements, and the embodiment does not make too many limitations on the specific structure of the pressure relief valve 274.

[0082] In this embodiment, the driving air chamber 24 can be pre-charged with a sufficient amount of high-pressure gas when the tool is shipped, so that the air pressure in the driving air chamber 24 meets the requirements of nailing; or the driving air chamber 24 can be pre-charged with a part of high-pressure gas when the tool is shipped, so that the air pressure in the driving air chamber 24 does not meet the requirements of nailing, and when nailing is needed, the tool first runs several cycles of idle stroke to make the air charging unit 2B first charge the driving air chamber 24, and then nailing is performed when the air pressure in the driving air chamber 24 meets the requirements of nailing; of course, the driving air chamber 24 can also not be pre-charged with high-pressure gas when the tool is shipped, and when nailing is needed, the tool first runs several cycles of idle stroke to make the air charging unit 2B first charge the driving air chamber 24, and then nailing is performed when the air pressure in the driving air chamber 24 meets the requirements of nailing. When the driving air chamber 24 is only pre-charged with a part of high-pressure gas or not pre-charged with high-pressure gas when the tool is shipped, a gas pressure detection element for detecting the air pressure in the driving air chamber 24 can be arranged on the cylinder unit 27, and when the control module of the tool judges that the air pressure in the driving air chamber 24 meets the requirements of nailing according to the air pressure detection signal fed back by the gas pressure detection element, a prompt signal is given, so as to remind the user that the tool can be used for nailing. In order to pre-charge the driving air chamber 24 with gas, a gas charging valve 276 can be arranged on the cylinder unit 27, and the gas charging valve 276 can be arranged on the outside of the cylinder shell 271 or on the top side of the cylinder cover 272 or on the bottom side of the base 273.

[0083] In this embodiment, the striking unit 2A and the air charging unit 2B have an upper ready position and a lower end position. In combination with Figure 10a , when the striking unit 2A and the air charging unit 2B are in the ready position, the driving piston 21 is close to the upper end of the support cylinder 23, and the gas in the driving air chamber 24 is in a high-pressure state. As a specific scheme of this embodiment, when the striking unit 2A is in the ready position, the upper surface of the driving piston 21 can be slightly higher than, slightly lower than, or flush with the upper surface of the support cylinder 23.

[0084] When nailing, the striking unit 2A is released, and the high-pressure gas in the driving air chamber 24 drives the striking unit 2A to move downward, and the downward moving striking unit 2A will drive the air charging unit 2B to move downward together. In combination with Figure 10b, the striking unit 2A continues to move downward, in the process of the striking unit 2A continuing to move downward, the volume of the air supplement chamber 26 is sharply compressed, correspondingly, the air pressure in the air supplement chamber 26 sharply increases and can reach a state of being higher than the air pressure in the driving chamber 24, at this time, the air supplement one-way valve 213 opens the air supplement hole 212 on the driving piston 21 under the condition of the air pressure in the air supplement chamber 26 sharply increasing, the gas in the air supplement chamber 26 can enter the driving chamber 24. When the air pressure in the driving chamber 24 basically reaches the air pressure in the air supplement chamber 26, the air supplement one-way valve 213 returns to the state of closing the air supplement hole 212, so that the driving chamber 24 and the air supplement chamber 26 are mutually cut off. In combination with Figure 10c When the driving piston 21 moves to basically contact the air supplement piston 25, the striking unit 2A and the air supplement unit 2B move downward to the end position. In the process of the striking piece 22 moving downward, the fastener 31 to be struck is driven into the workpiece 32, and the striking piece 22 preferably contacts the fastener 31 before the air supplement piston 25 stops moving, thereby ensuring the movement speed of the striking piece 22 when contacting the fastener 31, which is beneficial to ensuring the effect of driving the fastener. In addition, the volume change of the air supplement chamber 26 can provide a certain buffering effect for the striking unit 2A after contacting the fastener 31, which can greatly reduce the vibration of the tool when driving the fastener, and is beneficial to improving the user experience.

[0085] In combination with Figure 10d In the process of the lifting assembly 40 driving the striking unit 2A to move upward, before the limiting part 223 contacts the air supplement piston 25, the air supplement piston 25 is still in a static state, and the striking unit 2A moves upward for a stroke before the air supplement unit 2B, in the movement stroke, the volume of the air supplement chamber 26 gradually increases, correspondingly, the air pressure in the air supplement chamber 26 decreases and can reach a state of being lower than the external atmospheric pressure, at this time, the air inlet one-way valve 253 opens the air inlet hole 252 on the air supplement piston 25, and the external air can enter the air supplement chamber 26 through the air inlet hole 252, when the air pressure in the air supplement chamber 26 basically reaches the external atmospheric pressure, the air inlet one-way valve 253 returns to the state of closing the air inlet hole 252, so that the air supplement chamber 26 and the external air are mutually cut off. In combination with Figure 10e When the striking unit 2A moves upward to contact the limiting part 223 with the air supplement piston 25, the striking unit 2A continuing to move upward drives the air supplement unit 2B to move upward synchronously through the limiting part 223.

[0086] The striking unit 2A and the air supplement unit 2B can stop moving when moving upward to the ready position, or can stop moving when moving upward to a position lower than the ready position. When the stopping position of the striking unit 2A and the air supplement unit 2B when moving upward is lower than the ready position, the lifting assembly 40 first drives the striking unit 2A and the air supplement unit 2B to move upward to the ready position before the next nailing cycle is performed. When the tool is first used, the gas in the driving gas chamber 24 is sufficient, and the air pressure in the air supplement chamber 26 can not exceed the air pressure in the driving gas chamber 24 during the downward movement of the striking unit 2A and the air supplement unit 2B. At this time, the air supplement chamber 26 does not supplement air to the driving gas chamber 24, that is, the air supplement unit 2B does not supplement air to the driving gas chamber 24 in every nailing cycle. In addition, external air also does not enter the air supplement chamber 26 in every nailing cycle.

[0087] In combination Figure 10c , the straight line L1 represents the height position of the upper surface of the driving piston 21 when the driving piston 21 is in the ready position, and the straight line L2 represents the height position of the upper surface of the driving piston 21 when the driving piston 21 is in the end position. The distance from the position shown by the straight line L1 to the position shown by the straight line L2 is the stroke of the driving piston 21 when nailing. The volume of the driving gas chamber 24 when the driving piston 21 is in the ready position is V1, and the volume of the driving gas chamber 24 when the driving piston 21 is in the end position is V2 (V2>V1). V2-V1 is the volume change of the driving gas chamber 24 due to the stroke of the driving piston 21, and correspondingly, V2-V1 is the displacement volume 23A generated by the stroke of the driving piston 21. In this embodiment, since the driving piston 21 is always located in the support cylinder 23, the internal cavity of the support cylinder 23 between the straight line L1 and the straight line L2 constitutes the displacement volume 23A of the driving piston 21.

[0088] In this embodiment, one side of the striking member 22 in the length direction is provided with a plurality of convex teeth 221 distributed in the up-down direction. In combination Figure 14 、 Figure 15 、 Figure 16The lifting assembly 40 comprises a motor 43, a speed reducer 44 and a lifting gear 41, the lifting gear 41 can be engaged with the convex teeth 221 on the beating piece 22 to drive the beating piece 22 to move upward to the preparation position, and the upward moving beating piece 22 can drive the driving piston 21 and the air supplement piston 25 to move upward to the preparation position. Specifically, the motor 43 and the speed reducer 44 are arranged in the accommodating portion 52 of the casing 50, the support seat 61 is fixed below the base 273, the lifting gear 41 is sleeved on the transmission shaft 42, the transmission shaft 42 is rotatably arranged on the support seat 61 through a bearing, and the axial direction of the lifting assembly 40 is substantially perpendicular to the length direction of the beating piece 22. The output shaft 441 of the speed reducer 44 is sleeved with a driving wheel 451, the rear end of the transmission shaft 42 is sleeved with a driven wheel 452, and a transmission structure capable of being engaged and disengaged is arranged between the driving wheel 451 and the driven wheel 452. When the transmission structure is in the engaged state, the motor 43 drives the driving wheel 451 to rotate through the speed reducer 44, the rotating driving wheel 451 drives the transmission shaft 42 to rotate around the center axis thereof through the transmission structure, the rotating transmission shaft 42 drives the lifting gear 41 to rotate synchronously in the direction of +ω, the lifting gear 41 rotating in the direction of +ω drives the beating piece 22 to move upward to the preparation position through the meshing with the convex teeth 221, and the upward moving beating piece 22 drives the driving piston 21 and the air supplement piston 25 to also move to the preparation position. Figure 13 When the transmission structure is in the engaged state, the motor 43 drives the driving wheel 451 to rotate through the speed reducer 44, the rotating driving wheel 451 drives the transmission shaft 42 to rotate around the center axis thereof through the transmission structure, the rotating transmission shaft 42 drives the lifting gear 41 to rotate synchronously in the direction of +ω, the lifting gear 41 rotating in the direction of +ω drives the beating piece 22 to move upward to the preparation position through the meshing with the convex teeth 221, and the upward moving beating piece 22 drives the driving piston 21 and the air supplement piston 25 to also move to the preparation position.

[0089] When the transmission structure is in the engaged state, the motor 43 drives the driving wheel 451 to rotate through the speed reducer 44, the rotating driving wheel 451 drives the transmission shaft 42 to rotate around the center axis thereof through the transmission structure, the rotating transmission shaft 42 drives the lifting gear 41 to rotate synchronously in the direction of +ω, the lifting gear 41 rotating in the direction of +ω drives the beating piece 22 to move upward to the preparation position through the meshing with the convex teeth 221, and the upward moving beating piece 22 drives the driving piston 21 and the air supplement piston 25 to also move to the preparation position. Figure 17 , Figure 18The driving wheel 451 is provided with a cavity 4511 on the side facing the driven wheel 452, and the driven wheel 452 is arranged in the cavity 4511. The transmission structure comprises a transmission ratchet groove 461 arranged on the cavity wall of the cavity 4511, a transmission ratchet 462 swingably arranged on the driven wheel 452, a first spring 463 biasing the transmission ratchet 462 towards the cavity wall of the cavity 4511, and a rod shaft 62 arranged on the support seat 61 and used for pushing the transmission ratchet 462 away from the transmission ratchet groove 461. When the transmission ratchet 462 is embedded in the transmission ratchet groove 461 under the biasing action of the first spring 463, the transmission structure is in the engaged state, and the driving wheel 451 driven to rotate by the motor 43 drives the transmission shaft 42 and the lifting gear 41 to rotate in the +ω direction through the cooperation of the transmission ratchet groove 461 and the transmission ratchet 462, so that the lifting gear 41 can drive the striking unit 2A and the air supplementing unit 2B to move upwards to the preparation position. When the transmission ratchet 462 is pushed away from the transmission ratchet groove 461 by the rod shaft 62 against the biasing of the first spring 463, the transmission structure is in the disengaged state, and the striker 22 moving downwards during nailing drives the lifting gear 41 to rotate in the direction of -ω, and the lifting gear 41 rotating in the direction of -ω drives the transmission shaft 42 and the driven wheel 452 to rotate freely relative to the driving wheel 451, avoiding reverse rotation transmitted to the speed reducer 44. When it is needed to drive the striking unit 2A and the air supplementing unit 2B to return to the preparation position, the rotating driving wheel 451 can make the transmission ratchet 462 re-embedded in the transmission ratchet groove 461.

[0090] In combination Figure 19 , Figure 20In order to lock the striking unit 2A and the air supplement unit 2B in the normal position, a lock block 71 is arranged on the support base 61 and can slide in a direction perpendicular to the movement direction of the striking member 22. Specifically, the lock block 71 is arranged on the support base 61 and can slide left and right, the lower end of the striking member 22 is provided with a groove 222 matched with the lock block 71, and the support base 61 is further provided with a second spring 72 for biasing the lock block 71 towards the groove 222. A cam 73 for unlocking the lock block 71 is arranged on the transmission shaft 42, and the cam 73 can be integrally formed with the lifting gear 41 or independently formed with the lifting gear 41. In the normal position, the lock block 71 is partially embedded in the groove 222 to keep the striking unit 2A and the air supplement unit 2B in the normal position. When driving the nails, the motor 43 first drives the lifting gear 41, the transmission shaft 42 and the cam 73 to rotate in the +ω direction, the cam 73 rotating in the +ω direction drives the lock block 71 to slide away from the groove 222 against the bias of the second spring 72, so that the lock block 71 releases the striking member 22, and almost at the same time, the transmission structure is switched from the engaged state to the separated state, the released striking member 22 is driven by the driving piston 21 to move downward quickly, and the downward moving striking member 22 drives the lifting gear 41, the transmission shaft 42 and the driven wheel 452 to rotate reversely relative to the driving wheel 451. When the lifting gear 41 drives the striking member 22 to move upward to the normal position, the lock block 71 corresponds to the groove 222, the lock block 71 slides towards the groove 222 under the bias of the second spring 72 and is embedded in the groove 222, so as to lock the striking unit 2A and the air supplement unit 2B in the normal position.

[0091] In order to make the motor 43 stop in time, a fixed position switch 74 is arranged on the support base 61, and a pin 75 for triggering the position switch 74 is arranged on the lock block 71. A control module is arranged in the casing 50, the position switch 74 is signal connected to the control module, and the motor 43 is controlled by the control module. The pin 75 releases the position switch 74 when the lock block 71 is separated from the groove 222, and the pin 75 triggers the position switch 74 when the lock block 71 is re-embedded in the groove 222, and the control module can command the motor 43 to stop according to the triggering signal of the position switch 74.

[0092] In combination with Figure 11 , Figure 12 In this embodiment, the front side of the support base 61 is fixed with a guide base 63, and the guide base 63 and the support base 61 form a limiting channel 64 for the upward and downward movement of the striking member 22. The nail driving tool 10 further comprises a nail feeding device 80 detachably attached to the guide base 63, and the front end of the nail feeding device 80 is provided with a guide cover 81. In combination with Figure 2 , Figure 3When the nail feeding device 80 is attached to the guide seat 63, the guide seat 63 cooperates with the guide cover 81 to form a guide channel 65 which is open at both upper and lower ends. The nail feeding device 80 outputs the fastener 31 to be struck into the guide channel 65, and the striker 22 moving downward enters the guide channel 65 and strikes the fastener 31 to be struck downward into the workpiece 32. The striker 22 moving upward to the preparation position is separated upward from the guide channel 65, so that the nail feeding device 80 can smoothly output the next fastener 31 to be struck into the guide channel 65. The fastener 31 struck into the workpiece 32 in the embodiment can be a straight nail, a U-shaped nail or the like.

[0093] In combination Figure 1 The inside of the front end of the handle portion 53 is provided with a main switch which is signal-connected to the control module, and the bottom side of the front end of the handle portion 53 is provided with a trigger 66 for triggering the main switch. The casing 50 is further provided with a reinforcing portion 55 between the accommodating portion 52 and the battery connecting portion 54, and the control module can be arranged in the reinforcing portion 55. The nail feeding device 80 is detachably attached to the casing 50, and in order to improve the stability when the nail feeding device 80 is attached to the casing 50, a quick-release connecting structure can be arranged between the nail feeding device 80 and the reinforcing portion 55.

[0094] In combination Figure 21 The fastener striking tool 10 is further provided with a safety assembly 90, specifically, the safety assembly 90 includes a top rod 91, a safety switch 92, a third spring 93, a positioning frame 95 and an elastic member 96. The top rod 91 is movably arranged on the front side of the guide seat 63 and the movement stroke of the top rod 91 is limited. The upper end of the top rod 91 extends into the main body portion 51 and is provided with a contact piece 94 for triggering the safety switch 92. The safety switch 92 can be fixed on the support seat 61 or the guide seat 63 and is signal-connected to the control module. The third spring 93 biases the top rod 91 downward to release the safety switch 92 in the normal state. The positioning frame 95 is fixed on the lower end of the top rod 91, and the elastic member 96 is sleeved on the outside of the positioning frame 95 or arranged on the bottom of the positioning frame 95. When striking the nail, the positioning frame 95 is abutted against the workpiece 32, and the positioning frame 95 drives the top rod 91 to move upward against the bias of the third spring 93 to trigger the safety switch 92 by the contact piece 94. Only when both the safety switch 92 and the main switch are triggered, the tool can start the nail striking program, and the triggering sequence of the safety switch 92 and the main switch is not limited. In order to facilitate the adjustment of the striking depth, the positioning frame 95 is preferably connected to the lower end of the top rod 91 through threaded cooperation. As an alternative of the embodiment, the top rod 91 can also be arranged on the left side or the right side of the guide seat 63.

[0095] When the driving program is started, the rotating cam 73 drives the locking catch 71 to disengage from the groove 222, so that the locking catch 71 releases the striker 22. The high-pressure gas in the driving chamber 24 drives the striking unit 2A and the air supplementing unit 2B to move downward, the downward moving striker 22 extends into the guide channel 65 to drive the fastener 31 to be driven into the workpiece 32, the gas in the air supplementing chamber 26 can enter the driving chamber 24, and the lifting gear 41 rotates in the direction of -ω during the downward movement of the striking unit 2A.

[0096] When the striking unit 2A and the air supplementing unit 2B move to the end position, the lifting gear 41 rotates in the direction of +ω under the driving of the motor 43, the rotating lifting gear 41 drives the striking unit 2A to move upward before the air supplementing unit 2B, the external air can enter the air supplementing chamber 26, and then the upward moving striking unit 2A drives the air supplementing unit 2B to move upward synchronously. When the striking unit 2A and the air supplementing unit 2B move to the preparation position, the motor 43 stops.

[0097] As an alternative of the embodiment, the magnetic induction switch can be used instead of the in-place switch 74 to control the movement stroke of the striker 22. Specifically, a magnet is arranged on the striker 22, two magnetic induction elements are arranged on the support base 61 and / or the guide base 63 in up-down distribution, the magnetic induction elements are signal connected to the control module, the control module judges the position of the striker 22 according to the triggering condition of the magnetic induction elements, and the magnetic induction elements can be Hall elements or reed tubes. When the striker 22 moves to trigger one of the magnetic induction elements, it indicates that the striker 22 moves to the preparation position. When the striker 22 moves to trigger the other magnetic induction element, it indicates that the striker 22 moves to the end position. Of course, the magnet can also be arranged on the lifting gear 41.

[0098] As an alternative of the embodiment, the transmission structure of the lifting assembly 40 can also adopt the axial clutch structure, and at this time, the driven wheel 452 or the driving wheel 451 can slide in the axial direction. During the driving, the driving wheel 451 and the driven wheel 452 are in the separated state, so that the driven wheel 452 can rotate freely relative to the driving wheel 451; after the driving is completed, the driving wheel 451 and the driven wheel 452 are restored to the engaged state under the biasing action of the spring.

[0099] As an alternative of the embodiment, a connecting rod can also be arranged between the striker 22 and the driving piston 21, the upper end of the striker 22 is connected to the connecting rod, the upper end of the connecting rod is connected to the driving piston 21, and the protruding teeth 221 meshing with the lifting gear 41 are arranged on the connecting rod. The lifting gear 41 rotating in the direction of +ω drives the striking unit 2A and the air supplementing unit 2B to move upward to the preparation position through the connecting rod.

[0100] In combination Figure 22As an alternative to the present embodiment, the cylinder shell 271 can be provided in a non-cylindrical special-shaped structure, at this time, the cylinder shell 271 is located outside the partial support barrel 23, and the cylinder shell 271 has no fixed relationship with the base 273. The cylinder shell 271 and the support barrel 23 can be integrally formed or fixed together after being formed in parts. Of course, the cylinder shell 271 can also be provided in other reasonable structures.

[0101] As an alternative to the present embodiment, the lifting gear 41 can be provided with a missing tooth portion, that is, the teeth on the lifting gear 41 are not provided in a circumferential continuous manner. When driving, the missing tooth portion of the lifting gear 41 faces the striker 22, and the missing tooth portion is used to avoid the convex teeth 221 on the striker 22, so that the striker 22 can move downward smoothly, and the driving action of the striker 22 is avoided. After driving is completed, the lifting gear 41 rotating in the +ω direction re-engages with the convex teeth 221 to drive the striking unit 2A and the air supplementing unit 2B to move upward to the preparation position. In this scheme, the lifting gear 41 with the missing tooth portion can be directly sleeved on the output shaft 441 of the speed reducer 44, and the transmission shaft 42 is cancelled; of course, the lifting gear 41 can still be sleeved on the transmission shaft 42, at this time, a shaft coupling is provided between the transmission shaft 42 and the output shaft 441.

[0102] As an alternative to the present embodiment, the lifting assembly 40 can also use the driving assembly 400 described in CN221539660U, at this time, the striker 22 of the present embodiment is not provided with the convex teeth 221, and the rack in CN221539660U as the moving piece 420 is provided in the present embodiment to be movable up and down relative to the striker 22.

[0103] As an alternative to the present embodiment, the lock catch 71 can also be provided to be pivotable.

[0104] As an alternative to the present embodiment, the setting of the cam 73 can also be cancelled, at this time, the actions of releasing the striker 22 and locking the striker 22 by the lock catch 71 are driven by the electromagnetic solenoid, and the electromagnetic solenoid is controlled by the control module.

[0105] As an alternative to the present embodiment, the striking unit 2A and the air supplementing unit 2B can also be in the end position in a normal state. When starting the driving cycle, the lifting gear 41 first drives the striking unit 2A and the air supplementing unit 2B to move upward to the preparation position. Then the transmission structure is switched to the separated state, and the high-pressure gas in the driving chamber 24 drives the striking unit 2A and the air supplementing unit 2B to move downward to the end position. At this time, the settings of the lock catch 71, the second spring 72, the cam 73, the in-place switch 74 and the pin rod 75 can be cancelled.

[0106] As a further scheme of the embodiment, the tool is provided with a single striking mode and a continuous striking mode, and the tool is provided with a mode selection member which can be operated on the tool housing 50, and the user can switch the striking mode of the tool through the mode selection member, and the mode selection member can be reasonably arranged in the form of a bidirectional sliding push block, a tiltable button, a rotatable knob, a key, a touch screen, etc.

[0107] In addition to the preferred embodiments described above, the utility model also has other implementation manners, and those skilled in the art can make various changes and deformations according to the utility model, as long as the changes and deformations do not deviate from the spirit of the utility model, and all should belong to the range defined in the utility model claim.

Claims

1. A fastener driving tool, comprising: a support cylinder having two axial ends respectively facing a first direction and a second direction; a striking unit having a driving piston and a striker, wherein the driving piston is axially movable in the support cylinder, the support cylinder has a displacement volume generated by a stroke of the driving piston, the striker has one end connected to the driving piston and facing the first direction and the other end facing the second direction and being capable of contacting a fastener to be struck; a driving gas chamber in fluid communication with the displacement volume, wherein a high pressure gas in the driving gas chamber is capable of driving the striking unit to move towards the second direction; a lifting assembly for driving the striking unit to move towards the first direction; characterized in that further comprising a charging unit arranged in the support cylinder, the charging unit comprising a charging piston and a charging gas chamber, the charging piston is connected to the striker and located at the second direction of the driving piston, the charging gas chamber is located between the driving piston and the charging piston, the charging piston is movable relative to the striker within a range so that the volume of the charging gas chamber is variable; during the movement of the striking unit towards the second direction, the volume of the charging gas chamber is reduced and the gas in the charging gas chamber is capable of entering the driving gas chamber; during the movement of the striking unit towards the first direction, the volume of the charging gas chamber is increased and the external air is capable of entering the charging gas chamber.

2. The fastener driving tool of claim 1 wherein, the driving piston is provided with a charging hole and a charging one-way valve for opening and closing the charging hole, the charging one-way valve opens the charging hole when the gas pressure in the charging gas chamber is higher than the gas pressure in the driving gas chamber.

3. The fastener driving tool of claim 1, wherein the charging piston is provided with an air inlet hole and an air inlet one-way valve for opening and closing the air inlet hole, the air inlet one-way valve opens the air inlet hole when the gas pressure of the external air is higher than the gas pressure in the charging gas chamber.

4. The fastener driving tool of claim 1 wherein, the fastener driving tool further comprises a pressure relief valve for adjusting the gas pressure in the driving gas chamber, the pressure relief valve opens when the gas pressure in the driving gas chamber exceeds a predetermined pressure relief value.

5. The fastener driving tool of claim 1 wherein, the end of the support cylinder facing the second direction is provided with an elastic shock absorbing block, the striking unit continues to move towards the second direction after the charging piston contacts the shock absorbing block, so that the volume of the charging gas chamber is compressed.

6. The fastener driving tool of claim 1, wherein the striking unit moves towards the first direction before the charging piston, and the volume of the charging gas chamber is increased during the movement of the striking unit towards the first direction before the charging piston.

7. The fastener driving tool of claim 1, wherein the charging piston is sleeved on the striker, the striker is provided with a limiting portion for limiting the charging piston, and the charging piston is movable relative to the striker between the driving piston and the limiting portion.

8. The fastener driving tool according to claim 7, wherein the striker moving towards the first direction is capable of driving the charging piston to move synchronously through the limiting portion; and / or, the striker is provided with a supporting portion between the driving piston and the limiting portion, the supporting portion is thinner than the limiting portion, the charging piston is sleeved on the supporting portion, and a sealing ring is arranged between the supporting portion and the charging piston to keep a circumferential sealing fit therebetween.

9. The fastener driving tool of claim 1, wherein the driving piston and the support cylinder keep a circumferential sealing fit; and / or, the charging piston and the support cylinder keep a circumferential sealing fit.

10. The fastener-driving tool of claim 1, wherein the driving gas chamber is arranged around at least part of the support cylinder, and at least part of the driving gas chamber is located above the support cylinder.

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