Gas circuit control switch and nailing tool

Abstract

The invention discloses a gas circuit control switch and a nailing tool, belongs to pneumatic nailing tools, and aims to solve the problem that the existing nailing tool is not high in continuous shooting frequency. A traveling valve sleeve is configured for the gas circuit control switch, and the traveling valve sleeve is configured to move between a first position and a second position along a valve rod when gas pressures borne by the two axial ends of the traveling valve sleeve are different; when the valve rod is located at the closing position, the high-pressure air port communicates with the first air port, and the traveling valve sleeve is located at the first position; when the valve rod is located at the starting position, the traveling valve sleeve shifts between the first position and the second position to achieve continuous shooting of nailing, when the traveling valve sleeve is located at the first position, the first air port and the high-pressure air port are blocked by the traveling valve sleeve, the first air port is communicated with the pressure relief air port, and therefore the pressure relief path of the first air port is shortened, and the pressure relief time of the first air port is shortened. And when the traveling valve sleeve is located at the second position, the first air port and the high-pressure air port are communicated through the traveling valve sleeve so as to open the nailing air channel.

Description

Technical Field

[0001] The invention belongs to a pneumatic nailing tool, and in particular relates to an air circuit control switch and a nailing tool which can switch between continuous firing and single firing during nailing. Background Art

[0002] The invention patent with authorization announcement number CN217153055U discloses a speed-regulating single-to-continuous switching mechanism and a pneumatic tool, which can realize a two-in-one single-to-continuous switching function and a continuous speed regulating function.

[0003] This patent solution controls the high-pressure air in the air chamber to flow to the return air chamber through the switch mechanism and the speed-adjustable single-burst switching mechanism after the trigger is pulled, and then leaks out from the return air chamber through the gap between the gun needle and the bottom plug, so that the pressure of the control air chamber drops. The gas pressure on the lower side of the balance valve is higher than the pressure state of the return air chamber, which pushes the balance valve to move and open the nailing air path, so that the high-pressure air in the air storage chamber pushes the piston to move with the gun needle to nail. Among them, the path and time spent on the pressure relief of the control air chamber are relatively long, and in order to take into account that the return air chamber maintains sufficient air pressure to push the piston to reset when the cylinder is reset, the gap between the gun needle and the bottom plug should be moderate and not too large, and the pressure relief speed of the control air chamber is slow, thereby limiting the increase in the burst frequency. Summary of the invention

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defect of low continuous firing frequency of existing nailing tools and to provide a fast pressure relief air circuit control switch and a nailing tool with high continuous firing frequency.

[0005] To achieve the above object, the gas circuit control switch of the present invention comprises a seat, a trigger and a valve stem, wherein the valve stem is arranged on the seat, and the valve stem is arranged to be kept in a closed position under the action of high-pressure air and to move axially to a start position to overcome the action of the high-pressure air when the trigger is pulled; the characteristics are:

[0006] The gas circuit control switch has a high-pressure gas port, a first gas port, a second gas port and a pressure relief gas port. A floating valve sleeve is sleeved on the valve stem. The floating valve sleeve is configured to move along the valve stem between a first position and a second position when the gas pressures at both ends of the axial direction are different.

[0007] When the valve stem is in the closed position, the high-pressure gas port is connected to the first gas port and the floating valve sleeve is in the first position;

[0008] When the valve stem is in the starting position, the floating valve sleeve switches between the first position and the second position. When the floating valve sleeve is in the first position, the first air port and the high-pressure air port are blocked by the floating valve sleeve and the first air port is connected with the pressure relief port. When the floating valve sleeve is in the second position, the first air port and the high-pressure air port are connected through the floating valve sleeve.

[0009] The air path control switch is configured such that when the valve stem is located at the start position, the floating valve sleeve switches between the first position and the second position to achieve continuous nailing. When the floating valve sleeve is located at the first position, the first air port and the high-pressure air port are blocked by the floating valve sleeve and the first air port is connected to the pressure relief port, thereby shortening the path and time of pressure relief of the first air port. In particular, the pressure relief port is directly opened, which has a strong targeted effect and can quickly relieve the pressure of the control air chamber of the nailing tool. The floating valve sleeve quickly switches between the first position and the second position, thereby improving the continuous firing frequency of the nailing tool.

[0010] In order to ensure the flexibility of the action, a fixed sleeve is fixed on the seat, the fixed sleeve is coaxial with the valve stem and sleeved outside the floating valve sleeve, a radial first valve hole is provided on the fixed sleeve, the outer end of the first valve hole is the first air port, the high-pressure air port is arranged at the center of one end of the floating valve sleeve, a radial floating valve hole is provided on the floating valve sleeve, a pressure relief hole is provided on the valve stem, the outer end of the pressure relief hole is the pressure relief air port, the second air port is arranged on the seat for applying gas pressure to the other end of the floating valve sleeve, and the gas pressure applied by the high-pressure air port to one end of the floating valve sleeve is opposite to the gas pressure applied by the second air port to the other end of the floating valve sleeve;

[0011] When the valve stem is in the closed position, the high-pressure gas port is connected to the first gas port through the floating valve hole and the first valve hole;

[0012] When the valve stem is in the starting position, the first air port is connected to the pressure relief port through the first valve hole and the swimming valve hole when the swimming valve sleeve is in the first position, and the high-pressure air port is connected to the first air port through the swimming valve hole and the first valve hole when the swimming valve sleeve is in the second position.

[0013] Accordingly, by moving the floating valve sleeve, the direction of the air path of the air chamber is switched and controlled, thereby realizing the continuous firing function.

[0014] In order to ensure the sealing of the structure, the valve stem and the floating valve sleeve, the floating valve sleeve and the fixed sleeve, the floating valve sleeve and the seat, and the seat and the fixed sleeve are all axially sealed to prevent the air flow from axially flowing in the sealing part.

[0015] In order to achieve smooth air communication, the outer circumference of the fixed sleeve is provided with a first annular groove, and the outer port of the first valve hole is located in the first annular groove; the outer circumference of the floating valve sleeve is provided with a second annular groove, and the outer port of the floating valve hole is located in the second annular groove; the outer circumference of the valve stem is provided with a third annular groove, and the inner port of the pressure relief hole is located in the third annular groove. Accordingly, an annular cavity is formed at each annular groove, and multiple flow ports can be set at the first valve hole, the floating valve hole and the pressure relief hole to increase the flow speed of the airflow.

[0016] To achieve the above-mentioned purpose, the nailing tool of the present invention is characterized in that it includes a main body and an air circuit control switch of the present invention, the main body is equipped with an air storage chamber, a control air chamber, a working air chamber, a return air chamber, a first air circuit, a second air circuit, a nailing air circuit and an exhaust channel, the first air circuit connects the first air port of the air circuit control switch with the control air chamber, the high-pressure air port of the air circuit control switch connects the air storage chamber, the second air circuit connects the return air chamber with the second air port of the air circuit control switch, the nailing air circuit is arranged between the air storage chamber and the working air chamber, a first channel and a second channel are provided between the working air chamber and the return air chamber, a piston is arranged in the working air chamber and reciprocates between a nailing position and a reset position, when the piston is located at the nailing position after nailing with a gun needle, the first channel and the second channel are separated by the piston and the first channel supplies high-pressure air from the closed working air chamber to the return air chamber, when the piston is reset, the exhaust channel is opened and the second channel supplies high-pressure air from the closed return air chamber to the working air chamber to push the piston to move to the reset position.

[0017] Accordingly, by pulling the trigger to move the valve stem to the starting position, the floating valve sleeve is switched between the first position and the second position to realize continuous nailing, and when the floating valve sleeve is in the first position, the first air port is connected with the pressure relief port, thereby shortening the path and time for the control air chamber to release pressure through the first air port. In particular, the pressure relief port is directly opened, and the effect is highly targeted, so that the control air chamber of the nailing tool can be quickly depressurized, and the floating valve sleeve is quickly switched between the first position and the second position, thereby improving the continuous firing frequency of the nailing tool.

[0018] In order to facilitate assembly and improve the sealing and versatility of the air circuit control switch installed on the main body, a socket is provided on the main body, the port of the first air circuit is located at the socket, a throttling channel is provided on the seat, one end of the throttling channel adjacent to the floating valve sleeve is connected to the pressure change chamber, and the end of the throttling channel away from the floating valve sleeve is the second air port, the direction of the socket is perpendicular to the direction of the second air circuit, and the direction of the high-pressure air port is perpendicular to the direction of the second air port. The air circuit control switch is fixed to the main body by screws that obliquely pass through the seat, and the high-pressure air port of the air circuit control switch is connected to the socket by tightening the screws, and the second air port of the air circuit control switch is connected to the second air circuit. A speed regulating component for adjusting the flow of the throttling channel is arranged on the throttling channel to adjust the burst frequency of the nailing tool.

[0019] In order to improve the sealing performance of the gas circuit control switch when it is installed on the main body, the high-pressure gas port and the first gas port protrude from the seat and are inserted into the receiving interface.

[0020] In order to control the movement of the cylinder for nailing and resetting, a balance valve is provided between the control air chamber and the working air chamber. The balance valve separates the control air chamber from the working air chamber and is configured to move under the action of the change in gas pressure on both sides of the reset spring and the balance valve to open or close the nailing air circuit.

[0021] In order to open the nailing air circuit and exhaust in time and control the piston movement, a through hole is provided in the center of the balancing valve. When the balancing valve opens the nailing air circuit, one port of the through hole contacts the sealing gasket to close the exhaust passage. When the balancing valve closes the nailing air circuit, one port of the through hole leaves the sealing gasket to open the exhaust passage.

[0022] In order to prevent the compressed air in the return air chamber from flowing to the working air chamber through the first channel, the working air chamber is located inside the cylinder, and the return air chamber is located outside the cylinder. The outer peripheral wall of the cylinder has a fourth annular groove. The first channel is a radial through hole provided on the cylinder, and the outer port of the radial through hole is located in the fourth annular groove. An elastic sealing ring is sleeved in the fourth annular groove so that the first channel can only allow air to flow in one direction from the working air chamber to the return air chamber.

[0023] The present invention configures a floating valve sleeve for the air circuit control switch, and the floating valve sleeve is configured to move along the valve stem between the first position and the second position at different times under the gas pressures borne at the two axial ends thereof; and when the valve stem is in the closed position, the high-pressure air port is connected with the first air port and the floating valve sleeve is in the first position; when the valve stem is in the starting position, the floating valve sleeve switches between the first position and the second position to realize continuous nailing, when the floating valve sleeve is in the first position, the first air port and the high-pressure air port are blocked by the floating valve sleeve and the first air port is connected with the pressure relief air port, thereby shortening the path and time of the pressure relief of the first air port, allowing the control air chamber of the nailing tool to quickly relieve pressure and improve the continuous firing frequency of the nailing tool, and when the floating valve sleeve is in the second position, the first air port and the high-pressure air port are connected through the floating valve sleeve to open the nailing air circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an isometric view of the nailing tool of the present invention;

[0025] Figure 2 for Figure 1 An orthographic schematic diagram of the nailing tool shown;

[0026] Figure 3 for Figure 2 AA section view;

[0027] Figure 4 for Figure 1-3 A schematic diagram of the structural breakdown of the main body and top cover of the nailing tool;

[0028] Figure 5 for Figure 4 a schematic diagram of another viewing angle of the top cover shown;

[0029] Figure 6 for Figure 4 a schematic diagram of another view of the subject shown;

[0030] Figure 7 for Figure 4 , Figure 6An orthographic diagram of the subject shown;

[0031] Figure 8 for Figure 7 BB section view;

[0032] Fig. 9 for Figure 7 CC section view;

[0033] Fig.10 for Figure 1 An isometric view of the air circuit control switch of the nailing tool shown;

[0034] Fig.11 for Fig.10 An orthographic schematic diagram of the nailing tool shown;

[0035] Fig.12 for Fig.11 DD section view;

[0036] Fig.13 for Fig.11 EE section view;

[0037] Fig.14 for Fig.13 FF section view;

[0038] Fig.15 for Figure 10-14 The structural exploded diagram of the gas circuit control switch shown;

[0039] Fig.16 for Fig.15 A schematic diagram of a second perspective of the seat shown in FIG.

[0040] Fig.17 for Fig.15 A schematic diagram of the seat from a third perspective shown in FIG.

[0041] Fig.18 To trigger Figure 3 A schematic diagram of a trigger in the figure moving the valve stem to the starting position to start the nailing tool;

[0042] Fig.19 for Fig.18 A magnified view of the structure of part A;

[0043] Fig. 20 for Fig.18 A schematic diagram showing that the piston in the figure is in the nailing position after the gun needle has completed a nailing operation and is ready to be reset;

[0044] Fig.21 for Fig. 20 A magnified view of the structure of part B;

[0045] Fig. 22 for Fig. 20 Schematic diagram of the piston in the figure fully returning to the reset position with the gun needle;

[0046] Fig.23 for Fig. 22 A magnified view of the C-section structure;

[0047] Fig.24 for Fig. 22 Schematic diagram of the piston carrying the gun needle starting from the reset position to drive nails again;

[0048] Fig.25 for Fig.24 A magnified view of the D-section structure;

[0049] Fig.26 A schematic diagram of adjusting the burst frequency by rotating the adjustment lever;

[0050] Fig. 27 A schematic diagram of switching the nailing tool to a single-shot mode by pressing the adjustment lever;

[0051] Description of the numbers in the figure:

[0052] 100 gas circuit control switch:

[0053] 110 seat, 111 longitudinal hole, 112 transverse hole, 113 throttling channel, 114 pressure change chamber, 115 second air port, 116 trigger, 117 insurance, 118 torsion spring,

[0054] 120 switch assembly, 1201 valve stem, 1202 floating valve sleeve, 1203 fixed sleeve, 1204 first valve hole, 1205 first ring groove, 1206 floating valve hole, 1207 second ring groove, 1208 pressure relief hole, 1209 third ring groove, 1210 high pressure air port, 1211 first air port, 1212 pressure relief air port,

[0055] 130 speed regulating assembly, 131 adjusting rod, 132 adjusting sleeve, 133 plane, 134 annular groove, 135 helical compression spring, 136 retaining ring for the first shaft, 137 bolt, 138 retaining ring for the second shaft;

[0056] 140 screws;

[0057] 200 main body: 201 gun body, 202 top cover, 203 sealing gasket, 204 balance valve, 205 return spring, 206 cylinder, 207 piston, 208 gun needle, 209 buffer sleeve, 210 bottom plug, 211 air storage chamber, 212 control air chamber, 213 working air chamber, 214 return air chamber, 215 first air path, 216 second air path, 217 nailing air path, 218 exhaust channel, 219 first channel, 220 second channel, 221 socket, 222 through hole, 223 fourth ring groove, 224 elastic sealing ring;

[0058] 300 nail magazine. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0061] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Among them, "upper" and "lower" are in opposite directions.

[0062] In the description of the present invention, "gas pressure", "high pressure" and "low pressure" specifically refer to the pressure of gas, and "gas pressure" is the pressure exerted on the force-bearing surface by the gas pressure acting on the force-bearing surface.

[0063] In the description of the present invention, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present invention.

[0064] The present invention is described in detail below in conjunction with specific embodiments and accompanying drawings.

[0065] First, if Figure 10-17 The figure shows an air circuit control switch 100 , which can be assembled on a main body 200 of a pneumatic nailing tool for starting the nailing tool. The air circuit control switch 100 includes a seat 110 , a switch assembly 120 and a speed regulating assembly 130 .

[0066] Seat 110 Figure 15-17FIG. 1 shows a block-shaped structural member having a longitudinal hole 111, a transverse hole 112 and a throttling passage 113. The bottom of the longitudinal hole 111 and the middle of the transverse hole 112 are as shown in FIG. Figure 13-14 As shown, the throttle channel 113 is connected, and one end of the throttle channel 113 near the floating valve sleeve 1202 is connected to the pressure change chamber 114, and the pressure change chamber 114 is located at the lower side of the floating valve sleeve 1202. The end of the throttle channel 113 away from the floating valve sleeve 1202 is a second air port 115. The trigger 116 is connected to the seat 110 through a pin shaft. In order to prevent the trigger from being accidentally triggered and starting the nailing tool, a safety 117 is configured for the trigger. The safety 117 is assembled on the seat 110 through a pin shaft like the trigger and is located at a position supporting the trigger under the elastic force of the torsion spring 118. When the trigger is to be pulled, the safety needs to be pulled first so that the safety makes way for the trigger before the trigger can be pulled.

[0067] The switch assembly 120 includes a valve stem 1201 , a movable valve sleeve 1202 , and a fixed sleeve 1203 , which are coaxially assembled in the longitudinal hole 111 .

[0068] The fixing sleeve 1203 is fixed on the seat 110. This fixing method is reflected in that the air circuit control switch 100 is limited between the seat 1110 and the main body 200 when assembled to the pneumatic nailing tool, and the position of the fixing sleeve 1203 relative to the seat cannot be moved. The fixing sleeve 1203 is provided with a radial first valve hole 1204. The outer peripheral surface of the fixing sleeve 1203 is provided with a first annular groove 1205, and the outer port of the first valve hole 1204 is located in the first annular groove 1205.

[0069] In the diameter direction, the floating valve sleeve 1202 is located inside the fixed sleeve 1203, that is, the fixed sleeve 1203 is sleeved outside the floating valve sleeve 1202. The floating valve sleeve 1202 is provided with a radial floating valve hole 1206. The outer peripheral surface of the floating valve sleeve 1206 is provided with a second annular groove 1207, and the outer end of the floating valve hole 1206 is located in the second annular groove 1207.

[0070] In the diameter direction, the valve stem 1201 is covered by the floating valve sleeve 1202, and a pressure relief hole 1208 is provided on the valve stem 1201. A third annular groove 1209 is provided on the outer circumference of the valve stem 1201, and the inner port of the pressure relief hole 1208 is located in the third annular groove 1209. The lower end of the valve stem 1201 extends downward from the longitudinal hole 111 and presses against the trigger 116.

[0071] like Fig.12As shown, the valve stem 1201, the floating valve sleeve 1202 and the fixed sleeve 1203 form a sleeve assembly relationship in which the floating valve sleeve is sleeved outside the valve stem and the fixed sleeve is sleeved outside the floating valve sleeve. Moreover, the valve stem 1201 and the floating valve sleeve 1202, the floating valve sleeve 1202 and the fixed sleeve 1203, the floating valve sleeve 1202 and the seat 110, and the seat 110 and the fixed sleeve 1203 are all axially sealed to prevent the airflow from axially flowing in the sealing part, and this sealing is achieved by sleeved sealing rings at corresponding positions.

[0072] The gas circuit control switch 100 has a high-pressure gas port 1210, a first gas port 1211, a second gas port 115 and a pressure relief gas port 1212. The high-pressure gas port 1210 is arranged at the center of the upper end of the floating valve sleeve 1202, and the outer end of the first valve hole 1204 is the first gas port 1211. The second gas port 115 is arranged on the seat 110 to allow the air flow passing through to apply gas pressure to the lower end of the floating valve sleeve 1202. The outer end of the pressure relief hole 1208 is the pressure relief gas port 1212. Moreover, the gas pressure applied by the gas pressure from the high-pressure gas port 1210 to the upper end of the floating valve sleeve 1202 is opposite to the gas pressure applied by the gas pressure from the second gas port 115 to the lower end of the floating valve sleeve. Moreover, the high-pressure gas port 1210 and the first gas port 1211 protrude from the seat.

[0073] The valve stem 1201 is configured to remain in the closed position (low position) under the action of high-pressure air and to axially move to the start position (high position) against the action of high-pressure air when the trigger 116 is pulled. The floating valve sleeve 1202 is configured to move between the first position and the second position along the valve stem 1201 when the gas pressures at both ends of the axial direction thereof are not simultaneously applied.

[0074] Moreover, when the valve stem 1201 is located at the closed position, the high-pressure gas port 1210 is connected to the first gas port 1211 through the floating valve hole 1206 and the first valve hole 1204; and the floating valve sleeve 1202 is located at the first position.

[0075] When the valve stem 1201 is located at the starting position, the floating valve sleeve 1202 switches between the first position and the second position. When the floating valve sleeve 1202 is located at the first position, the first air port 1211 and the high-pressure air port 1210 are blocked by the floating valve sleeve 1202, and the first air port 1211 is connected to the pressure relief port 1212 via the first valve hole 1204 and the floating valve hole 1206. When the floating valve sleeve 1202 is located at the second position, the first air port 1211 is connected to the high-pressure air port 1210 via the first valve hole 1204 and the floating valve hole 1206.

[0076] Accordingly, by pulling the trigger 116 to change the position of the valve stem 1201, the floating valve sleeve 1202 rises and falls due to the different gas pressures at the upper and lower ends, thereby causing the connection and blocking relationship of each gas port of the switch assembly 120 to change, thereby realizing the start-up control of the nailing tool.

[0077] The speed regulating component 130 is as follows Fig.13 , Fig.15 , Figure 26-27 As shown, it includes an adjusting rod 131, an adjusting sleeve 132 and a helical compression spring 315. The adjusting rod 131 is assembled in the transverse hole 112 by a first shaft retaining ring 136 and can move along the length direction of the adjusting rod. The adjusting rod 131 is biased toward one end under the action of the helical compression spring 135. Pressing the adjusting rod to overcome the elastic force of the helical compression spring 135 can cause the adjusting rod to move to the other end. The adjusting sleeve 132 is connected to the adjusting rod 131 through a threaded sleeve like a nut and is located in the transverse hole 112. The outer wall of the adjusting sleeve 132 is provided with a plane 133. The bolt 137 connected to the seat 110 points to the plane 133 to limit the rotation of the adjusting sleeve. Therefore, the adjusting sleeve can be caused to move along the adjusting rod by rotating the adjusting rod. The outer wall of the adjusting sleeve 132 is provided with an annular groove 134. The size of the overlapping part of the annular groove 134 and the second air port 115 is changed by moving the adjusting sleeve 132 to adjust the opening of the throttling channel 113. In addition, a second shaft retaining ring 138 is mounted on the adjusting rod 131, and the movement of the adjusting sleeve 132 on the adjusting rod is limited between the second shaft retaining ring 138 and the step of the adjusting rod, so as to prevent the adjusting sleeve from moving out of its adjustment range.

[0078] like Figure 1-3 , Figure 18-25 The nailing tool shown in the figure includes a main body 200 and the gas circuit control switch 100 as described above. The main body 200 is particularly Figure 1-3 The nailing tool shown in the figure, excluding the air circuit control switch 100 and the nail magazine 300, includes a gun body 201, a top cover 202, a sealing gasket 203, a balance valve 204, a return spring 205, a cylinder 206, a piston 207, a gun needle 208, a buffer sleeve 209 and a bottom plug 210. The main body 200 is equipped with an air storage chamber 211, a control air chamber 212, a working air chamber 213, a return air chamber 214, a first air circuit 215, a second air circuit 216, a nailing air circuit 217 and an exhaust channel 218. The air circuit control switch 100 is fixed to the main body 200 by a screw 140 that obliquely passes through the seat. The first air circuit 215 is provided on the gun body 201 and the top cover 202, and the port and the docking interface of the first air circuit 215 are at Figure 4-6The first gas path 215 connects the first gas port 1211 of the gas path control switch with the control gas chamber 212, the high pressure gas port 1210 of the gas path control switch connects the gas storage chamber 211, the second gas path 216 connects the return gas chamber 214 with the second gas port 115 of the gas path control switch, the nailing gas path 217 is arranged between the gas storage chamber 211 and the working gas chamber 213, and the working gas chamber 213 and the return gas chamber 214 have a first channel 219 and a second channel 220, and the working gas chamber is arranged between the nailing position and the return gas chamber 214. The piston 207 reciprocates between the reset position. When the piston 207 is in the nailing position after carrying the gun needle 208 to nail, the first channel 219 and the second channel 220 are separated by the piston 207 and the first channel 219 supplies high-pressure air from the closed working air chamber 213 to the return air chamber 214. When the piston 207 is reset, the exhaust channel 218 is opened and the second channel 220 supplies high-pressure air from the closed return air chamber 214 to the working air chamber 213 to push the piston to move from the nailing position to the reset position.

[0079] Moreover, a socket 221 is provided on the gun body 201, and the port 215 of the first gas circuit is located at the socket 221. The orientation of the socket 221 is perpendicular to the orientation of the second gas circuit 216, and the orientation of the high-pressure gas port 1210 is perpendicular to the orientation of the second gas port 115. The gas circuit control switch is fastened by the screw 140 so that the high-pressure gas port 1210 of the gas circuit control switch is docked with the socket 221, and the second gas port 115 of the gas circuit control switch is docked with the second gas circuit 216. The speed regulating component 130 for adjusting the flow of the throttling channel is configured on the throttling channel 113 to adjust the burst frequency of the nailing tool. The high-pressure gas port 1210 and the first gas port 1211 are inserted into the socket 221. A balance valve 204 is provided between the control air chamber 212 and the working air chamber 213. The balance valve 204 separates the control air chamber 212 from the working air chamber 213 and is configured to move under the action of the return spring 205 and the air pressure change on both sides of the balance valve to open or close the nailing air path 217. The balance valve 204 has a through hole 222 at its center. When the balance valve opens the nailing air path, the upper end of the through hole 222 contacts the sealing gasket 203 to close the exhaust channel 218. When the balance valve closes the nailing air path, the upper end of the through hole 222 leaves the sealing gasket 203 to open the exhaust channel 218.

[0080] The working air chamber 213 is located inside the cylinder 206, and the return air chamber 214 is located outside the cylinder 206. The outer peripheral wall of the cylinder 206 has a fourth annular groove 223. The first channel 216 is a radial through hole provided on the cylinder 206, and the outer port of the radial through hole is located in the fourth annular groove 223. An elastic sealing ring 224 is sleeved in the fourth annular groove 223 so that the first channel can only allow air to flow in one direction from the working air chamber 214 to the return air chamber 213.

[0081] As mentioned above, the air storage chamber 211 is connected to a gas tank of compressed air, and the nailing tool is started by pulling the trigger through the air circuit control switch. By pressing the adjusting rod so that the adjusting sleeve completely blocks the throttling channel, the nailing tool will be in single-shot mode. By rotating the adjusting rod to adjust the position of the adjusting sleeve and changing the flow capacity of the throttling channel, the nailing frequency of the nailing tool in the continuous mode can be adjusted. In the illustrated structure, the nailing tool is in the continuous mode when the adjusting rod is in the natural state, and the nailing tool is in the single-shot mode when the adjusting rod is pressed so that the adjusting sleeve completely blocks the throttling channel. However, in the specific implementation, it can also be set that when the adjusting rod is in the natural state, the adjusting sleeve completely blocks the throttling channel, and the nailing tool is in the single-shot mode, and the nailing tool is switched to the continuous mode by pressing the adjusting rod.

[0082] like Figure 3 As shown, when the trigger 116 is not pulled, the valve stem 1201 is in the closed position (low position), the floating valve sleeve 1202 is in the first position (low position), and the compressed air in the air storage chamber 211 acts on the upper and lower sides of the balance valve 204 through two paths. One path acts on the lower side of the balance valve 204 through the nailing air path 217, and the other path enters the control air chamber 212 through the high-pressure air port 1210, the floating valve hole 1206, the first valve hole 1204, the first air port 1211, and the first air path 215 to act on the upper side of the balance valve 204. The upper and lower sides of the balance valve 204 are both affected by the high-pressure air, and the upper side of the balance valve 204 is also affected by the downward elastic force of the reset spring 205. The balance valve 204 is in the low position, the upper end of the working air chamber 213 is blocked, and the nailing air path 217 is blocked. The piston 207 is in the reset position (high position). The upper end of the floating valve sleeve 1202 is acted upon by the high-pressure air in the air storage chamber 211, and the lower end of the floating valve sleeve 1202 is connected to the return air chamber 214 via the pressure change chamber 114, the throttling channel 113, and the second air path 216 and is acted upon by the low-pressure air. The floating valve sleeve 1202 is in the first position (low position).

[0083] like Figure 24-25 As shown, after the trigger 116 is pulled, the valve stem 1201 is pushed to the starting position (high position) by the trigger, and the floating valve sleeve 1202 is still in the first position (low position). At this time, the high-pressure air in the control air chamber 212 leaks out through the first air path 215, the first air port 1211, the first valve hole 1204, the floating valve hole 1206, the pressure relief hole 1208 and the pressure relief port 1212, and the pressure in the control air chamber 212 becomes low. The force on the lower side of the balancing valve 204 is greater than the force on the upper side and moves upward. The upper end of the through hole 222 contacts the sealing gasket 203 to close the exhaust channel 218, and the balancing valve 204 opens the nailing air path 217. The high-pressure air in the air storage chamber 211 acts on the upper end of the piston 207 through the nailing air path, causing the piston 207 to move downward rapidly, and the gun needle 208 impacts the nail in the nail magazine 300 to achieve one nailing, until the piston 207 moves to Figure 18-19In the lowest nailing position shown, the lower end of the piston 207 contacts the upper end of the buffer sleeve 209 to block the second air path 216. The first channel 219 and the second channel 220 are separated by the piston 207. The first channel 219 is located on the upper side of the piston 207, and the second channel 220 is located on the lower side of the piston 207. Then, the first channel 219 supplies high-pressure air to flow from the closed working air chamber 213 to the return air chamber 214. The high-pressure air in the return air chamber 214 then flows to the pressure change chamber 114 through the second air path 216 and the throttling channel 113 until the upper and lower end faces of the floating valve sleeve 1202 are converted into high-pressure air. At this time, since the area of ​​the lower end face of the floating valve sleeve that receives air pressure is larger than the area of ​​the upper end face that receives air pressure, the floating valve sleeve 1202 will move up to Figure 20-21 Second position (high) shown.

[0084] like Figure 20-21 As shown, the movable valve sleeve 1202 moves upward to Figure 20-21 After the second position (high position) is shown, the high-pressure air in the air storage chamber 211 is connected to the control air chamber 213 through the high-pressure air port 1210, the floating valve hole 1206, the first valve hole 1204, the first air port 1211 and the first air path 215, and the air pressure on the upper side of the balancing valve 204 is restored to high pressure. The balancing valve moves downward under the elastic force of the return spring 205, and the upper end of the balancing valve through hole 222 leaves the sealing gasket 203 to open the exhaust channel 218. The balancing valve 204 closes the nailing air path 217, and the high-pressure air in the working air chamber 213 is discharged through the exhaust channel 218. The working air chamber becomes low pressure, and the high-pressure air in the closed return air chamber 214 acts on the lower end surface of the piston 207 from the second channel 216 and pushes the piston to Figure 22-23 The reset position (high) shown is moved.

[0085] like Figure 22-23 As shown, the piston 207 is in the reset position, the piston 207 opens the second air path 216, the first channel 215 and the second channel 216 are both located at the lower side of the piston 207, and the high-pressure air in the return air chamber 214 enters the space at the lower end of the cylinder through the channel between the lower end of the cylinder 206 and the buffer sleeve 209 and leaks out through the gap between the gun needle 208 and the bottom plug 210 together with the high-pressure air in the space below the piston in the working air chamber 213 until it returns to the reset position. Figure 24-25 Status shown.

[0086] Figure 3 , Figure 18-25 In the figure, arrows and dashed lines with arrows are used to express the flow direction of the airflow in the corresponding flow channel.

[0087] As mentioned above, after the trigger is pulled, the nail driving device will follow Figure 24-25 , 18-19, 20-21, 22-23 to achieve continuous nailing. To adjust the frequency of continuous nailing, such as Fig.26 As shown in the figure, the adjusting rod 131 is rotated to cause the adjusting sleeve 132 to move along the adjusting rod, thereby changing the size of the overlapping portion of the annular groove 134 and the second air port 115, adjusting the opening of the throttling channel 113, and adjusting Figure 18-19 The state shown transitions to Figure 20-21 The time of the working state shown can adjust the frequency of continuous nailing.

[0088] If you want to nail a single shot, Fig. 27 As shown, the adjusting rod 131 is pressed to make the adjusting sleeve 132 completely block the second air port 115, and the throttling channel 113 is blocked, then Figure 3 Each time the trigger is pulled, the nailing tool performs one Figure 24-25 to Figure 18-19 The nailing process, then release the trigger, the valve stem 1201 from Figure 18-19 The status shown is reset to Figure 3 The closed position shown, the air path of the nailing tool is restored to Figure 3 Repeat from Figure 3 In the state shown, pull the trigger once and release it to repeat single-shot nailing.

Claims

1. A gas circuit control switch, comprising a seat (110), a trigger (116) and a valve stem (1201), wherein the valve stem (1201) is arranged on the seat (110), and the valve stem (1201) is arranged to remain in a closed position under the action of high-pressure air and to move axially to a start position against the action of the high-pressure air when the trigger is pulled; wherein the valve stem (1201) is characterized in that: The gas circuit control switch comprises a high-pressure gas port (1210), a first gas port (1211), a second gas port (115) and a pressure relief gas port (1212); a floating valve sleeve (1202) is sleeved on a valve stem (1201); the floating valve sleeve (1202) is configured to move between a first position and a second position along the valve stem when the gas pressures at both ends of the axial direction thereof are different at the same time; When the valve stem (1201) is in the closed position, the high-pressure gas port (1210) is in communication with the first gas port (1211) and the floating valve sleeve is in the first position; When the valve stem (1201) is located at the start position, the floating valve sleeve (1202) switches between the first position and the second position. When the floating valve sleeve (1202) is located at the first position, the first air port (1211) and the high-pressure air port (1210) are blocked by the floating valve sleeve (1202) and the first air port (1211) is connected to the pressure relief air port (1212). When the floating valve sleeve (1202) is located at the second position, the first air port (1211) and the high-pressure air port (1210) are connected via the floating valve sleeve (1202).

2. The gas circuit control switch according to claim 1, characterized in that: A fixed sleeve (1203) is fixed on the seat (110). The fixed sleeve (1203) is coaxial with the valve stem (1201) and is sleeved outside the floating valve sleeve (1202). The fixed sleeve (1203) is provided with a radial first valve hole (1204). The outer end of the first valve hole (1204) is a first gas port (1211). The high-pressure gas port (1210) is arranged at the center of one end of the floating valve sleeve (1202). The floating valve sleeve (1202) is provided with a radial floating valve. A hole (1206) is formed on the valve stem (1201), a pressure relief hole (1208) is formed on the valve stem (1201), an outer end of the pressure relief hole (1208) is a pressure relief gas port (1212), a second gas port (115) is formed on the seat (110) and is used to apply gas pressure to the other end of the floating valve sleeve (1202), and the gas pressure applied by the high-pressure gas port (1210) to one end of the floating valve sleeve (1202) is opposite to the gas pressure applied by the second gas port (115) to the other end of the floating valve sleeve; When the valve stem (1201) is in the closed position, the high-pressure gas port (1210) is connected to the first gas port (1211) via the floating valve hole (1206) and the first valve hole (1204); When the valve stem (1201) is located at the start position, the first air port (1211) is connected to the pressure relief port (1212) via the first valve hole (1204) and the swimming valve hole (1206) when the swimming valve sleeve (1202) is located at the first position, and the high-pressure air port (1210) is connected to the first air port (1211) via the swimming valve hole (1206) and the first valve hole (1204) when the swimming valve sleeve (1202) is located at the second position.

3. The gas circuit control switch according to claim 2, characterized in that: Axial seals are formed between the valve stem (1201) and the movable valve sleeve (1202), between the movable valve sleeve (1202) and the fixed sleeve (1203), between the movable valve sleeve (1202) and the seat (110), and between the seat (110) and the fixed sleeve (1203) to prevent airflow from flowing axially at the sealing portion.

4. The gas path control switch according to claim 2, characterized in that: A first annular groove (1205) is provided on the outer circumference of the fixed sleeve (1203), and the outer port of the first valve hole (1204) is located in the first annular groove (1205); a second annular groove (1207) is provided on the outer circumference of the floating valve sleeve (1202), and the outer port of the floating valve hole (1206) is located in the second annular groove (1207); a third annular groove (1209) is provided on the outer circumference of the valve stem (1201), and the inner port of the pressure relief hole (1208) is located in the third annular groove (1209).

5. A nailing tool, characterized by: The invention comprises a main body (200) and an air path control switch (100) as claimed in any one of claims 1 to 4, wherein the main body (200) is provided with an air storage chamber (211), a control air chamber (212), a working air chamber (213), a return air chamber (214), a first air path (215), a second air path (216), a nailing air path (217) and an exhaust passage (218), wherein the first air path (215) connects the first air port (1211) of the air path control switch (100) with the control air chamber (212), the high pressure air port (1210) of the air path control switch connects the air storage chamber (211), the second air path (216) connects the return air chamber (214) with the second air port (115) of the air path control switch, and the nailing air path (217) is arranged between the air storage chamber (211) and the working air chamber (212). 13), a first channel (219) and a second channel (220) are provided between the working air chamber (213) and the return air chamber (214), a piston (207) is arranged in the working air chamber (213) and reciprocates between a nailing position and a reset position, when the piston (207) is located at the nailing position after nailing with a gun needle (208), the first channel (219) and the second channel (220) are separated by the piston (207), and the first channel (219) supplies high-pressure air from the closed working air chamber (213) to the return air chamber (214), when the piston (207) is reset, the exhaust channel (218) is opened, and the second channel (220) supplies high-pressure air from the closed return air chamber (214) to the working air chamber (213), pushing the piston (207) to move to the reset position.

6. The nailing tool according to claim 5, characterized in that: A receiving port (221) is provided on the main body (200), a port of the first gas path (215) is located at the receiving port (221), a throttling channel (113) is provided on the seat (110), one end of the throttling channel (113) adjacent to the floating valve sleeve (1202) is connected to the pressure change chamber (114), and one end of the throttling channel (113) away from the floating valve sleeve (1202) is the second gas port (115), the direction of the receiving port (221) is perpendicular to the direction of the second gas path (216), and the high pressure gas port (115) is connected to the pressure change chamber (114). The gas circuit control switch (100) is fixed to the main body (200) by means of screws (140) passing through the seat in an oblique direction, and the high-pressure gas port (1210) of the gas circuit control switch is connected to the receiving interface (221), and the second gas port (115) of the gas circuit control switch is connected to the second gas circuit (216) by means of the tightening of the screws. A speed regulating component (130) for adjusting the flow rate of the throttling channel is arranged on the throttling channel (113) for adjusting the continuous firing frequency of the nailing tool.

7. The nailing tool according to claim 6, characterized in that: The high-pressure gas port (1210) and the first gas port (1211) protrude from the seat (110) and are inserted into the receiving port (221).

8. The nailing tool according to claim 5, characterized in that: A balance valve (204) is provided between the air chamber (212) and the working air chamber (213). The balance valve (204) separates the control air chamber (212) from the working air chamber (213) and is configured to move under the action of a return spring (205) and changes in gas pressure on both sides of the balance valve to open or close the nailing air path (217).

9. The nailing tool according to claim 8, characterized in that: The balance valve (204) has a through hole (222) at its center. When the balance valve (204) opens the nailing gas path (217), one end of the through hole (222) contacts the sealing gasket (203) to close the exhaust channel (218). When the balance valve (204) closes the nailing gas path (217), one end of the through hole (222) leaves the sealing gasket (203) to open the exhaust channel (218).

10. The nailing tool according to claim 5, characterized in that: The air chamber (213) is located inside the cylinder (206), the return air chamber (214) is located outside the cylinder (206), the outer peripheral wall of the cylinder (206) has a fourth annular groove (223), the first channel (219) is a radial through hole provided on the cylinder (206), and the outer end of the radial through hole is located in the fourth annular groove (223), and an elastic sealing ring (224) is sleeved in the fourth annular groove (223) so that the first channel can only provide one-way flow of air from the working air chamber (213) to the return air chamber (214).

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