Apparatus for controlling communication / separation of air chambers of spring-loaded pneumatic power tool

Abstract

Disclosed is an apparatus for controlling communication / separation of air chambers of a spring-loaded pneumatic power tool, said apparatus comprising a cylinder housing (11) and an energy accumulator housing (13), a first air chamber (111) being formed inside of the cylinder housing (11), and a second air chamber (131) being formed inside of the energy accumulator housing (13). A piston striker assembly (6) that can move in the axial direction is arranged in the cylinder housing (11). A lifting wheel (3) and a locking assembly (2) are respectively arranged on two sides of a path of movement of a striker (61), and the lifting wheel (3) and the locking assembly (2) are both controlled by a motor (1). The side on the end at which the cylinder housing (11) is connected to the energy accumulator housing (13) is further provided with an opening / closing valve (14) and a jacking spring (15). Under the action of the jacking spring (15), the opening / closing valve (14) blocks an end surface of the cylinder housing (11), such that the first air chamber (111) is separated from the second air chamber (131). A driving rod (10) is further provided in the energy accumulator housing (13), one end of the driving rod (10) is connected to the opening / closing valve (14) to form a synchronous movement structure, and the other end of the driving rod (10) extends out of the energy accumulator housing (13). The first air chamber (111) and the second air chamber (131) are controlled to be in communication or separated by the movement of the opening / closing valve (14). When the piston striker assembly (6) is in an upper stop position, the opening / closing valve (14) blocks the end surface of the cylinder housing (11). The apparatus bears small initial kinetic energy from false firing, thus having a longer product life and providing higher safety.

Description

Air chamber on-off control device of gas spring type electric tool TECHNICAL FIELD

[0001] The utility model relates to an air chamber on-off control device of a gas spring type electric tool. BACKGROUND

[0002] The gas spring type electric tool is very common on the market, and its structure comprises a cylinder shell, an energy accumulator shell, a first air chamber is formed in the cylinder shell, a second air chamber is formed in the energy accumulator shell, the gas between the first air chamber and the second air chamber is always kept in a state of communication, in addition, an axially movable piston striker assembly is arranged in the cylinder shell, one side of the movement path of the striker is provided with a lifting wheel, and the other side is provided with a locking assembly, and the lifting wheel and the locking assembly are both controlled by a motor; the nailing cycle process is as follows: when the piston striker assembly is at the upper stop position (preparation state), the locking assembly locks the striker, the motor controls the locking assembly to be unlocked, the high-pressure gas in the second air chamber of the energy accumulator shell pushes the piston striker assembly to move to realize nailing, the piston striker assembly moves from the upper stop position to the lower stop position (firing state), after the piston striker assembly reaches the lower stop position, the motor controls the lifting wheel to rotate, the rotation of the lifting wheel drives the piston striker assembly to move from the lower stop position to the upper stop position again, that is, the piston striker assembly is reset, and then the locking assembly locks the striker again.

[0003] The gas spring type electric nail gun with the conventional structure is always kept in a state of communication between the first air chamber and the second air chamber, and the energy accumulator always gives the piston striker assembly a certain gas pressure, especially at the upper stop position, because the gas is compressed to the limit, the gas pressure value at this time is very high, and the locking assembly depends on the lateral locking force on the striker, and the locking assembly always has a larger force-bearing part that is prone to fatigue damage, in addition, when abnormal failure of the locking assembly occurs, the striker will be rapidly fired, and there is a certain safety hazard.

[0004] Practical content

[0005] In view of the deficiencies in the above problems, the utility model provides an air chamber on-off control device of a gas spring type electric tool.

[0006] To achieve the above objectives, this utility model provides a gas chamber on / off control device for a gas spring type power tool, including a cylinder housing and an energy storage housing fixed in position relative to the cylinder housing. The right sides of both the cylinder housing and the energy storage housing are closed by end caps. A first gas chamber is formed inside the cylinder housing, and a second gas chamber is formed inside the energy storage housing. An axially movable piston-pin assembly is provided inside the cylinder housing. The piston-pin assembly includes a piston and a pin fixedly connected together. Lifting wheels and locking assemblies are respectively provided on both sides of the movement path of the pin. The lifting wheels and the locking assemblies are both controlled by a motor. An on / off valve and a holding spring are also provided on one side of the connection end between the cylinder housing and the energy storage housing. The on / off valve blocks the end face of the cylinder housing under the action of the holding spring, thus isolating the first gas chamber from the second gas chamber. A drive rod is also provided inside the energy storage housing. One end of the drive rod is connected to the on / off valve to form a synchronous movement structure, and the other end of the drive rod extends outside the energy storage housing.

[0007] Furthermore, the energy storage housing is connected to the cylinder housing via a connector. The second air chamber includes an upper chamber located outside the cylinder housing and a lower chamber located on the other side outside the cylinder housing. The upper chamber and the lower chamber are always in communication. One end of the on / off valve is provided with a countersunk hole, and the wall of the countersunk hole is provided with a through hole communicating with the second air chamber.

[0008] Furthermore, the drive rod is located in the upper chamber, and the drive rod includes separate rods a and b. Rod a includes an integral bent portion, which is engaged in the annular groove of the opening and closing valve to form a synchronous movement structure.

[0009] Furthermore, the output shaft of the motor is also provided with a first cam and a second cam that rotate synchronously. The first cam is connected to the drive rod through a transmission rod, and the second cam is linked to the locking assembly through a transmission component to realize the locking and unlocking control of the firing pin.

[0010] Furthermore, the first cam and the second cam are integral parts, and the radial upward displacement of the second cam from the output shaft centerline X is greater than the radial upward displacement of the first cam from the output shaft centerline X.

[0011] Furthermore, one end of the transmission rod is fixedly connected to the rod b by a fastener, and the other end of the transmission rod is equipped with a roller. During the process of the opening and closing valve opening to the maximum stroke, the roller and the first cam are always in contact.

[0012] Further, the rod b is provided with a sealing ring, the sealing ring forms a seal between the upper chamber and the outside, meanwhile, the energy accumulator housing is provided with a latch, the latch limits the active position of the rod b.

[0013] Further, the rod b is further provided with a supporting spring, two ends of the supporting spring are respectively arranged between the transmission rod and the energy accumulator housing.

[0014] The utility model discloses relative to prior art beneficial effect is: the on-off of first gas chamber, second gas chamber is realized control by the activity of open-close valve, and when piston striker assembly is in upper stop position, open-close valve blocks the end face of cylinder shell, and piston striker assembly only receives the internal energy of first gas chamber compressed gas, and the internal energy generated is small because the gas capacity in first gas chamber is small, and the initial kinetic energy generated by piston striker assembly due to the failure of parts is small, and the movement distance of piston striker assembly along the axis is small, and the striker stops without contacting the driving fastener, avoids accidental injury, and the life of product is longer, and safety is higher. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a perspective view of the gas chamber on-off control device of the gas spring type electric tool;

[0016] Fig. 2 is an internal structure view of the gas chamber on-off control device of the gas spring type electric tool;

[0017] Fig. 3 is a schematic view of the driving rod;

[0018] Fig. 4 is a schematic view of the transmission rod;

[0019] Fig. 5 is a schematic view of the integrated first cam and second cam;

[0020] Fig. 6 is a sectional view of the gas chamber on-off control device of the gas spring type electric tool (preparation state);

[0021] Fig. 7 is a sectional view of the gas chamber on-off control device of the gas spring type electric tool (open-close valve opening);

[0022] Fig. 8 is a sectional view of the gas chamber on-off control device of the gas spring type electric tool (locking assembly unlocking);

[0023] Fig. 9 is a sectional view of the gas chamber on-off control device of the gas spring type electric tool (firing state).

[0024] In the figure: 1, motor; 2, locking assembly; 3, lifting wheel; 4, first cam; 5, second cam; 6, piston striker assembly; 61, striker; 62, piston; 7, roller; 8, transmission rod; 9, supporting spring; 10, driving rod; 101, rod a; 1011, bent part; 102, rod b; 103, sealing ring; 11, cylinder housing; 111, first air chamber; 12, connecting piece; 13, energy accumulator housing; 131, second air chamber; 1311, upper chamber; 1312, lower chamber; 14, on-off valve; 141, ring groove; 142, communication hole; 15, top-holding spring; 16, end cover; 17, latch. DETAILED DESCRIPTION

[0025] As shown in Figures 1-9, the utility model discloses a kind of air chamber on-off control device of gas spring type electric tool, including a cylinder shell 11, relative to the energy storage device shell 13 of position fixed of cylinder shell 11, cylinder shell 11, energy storage device shell 13 Right side is closed by end cap 16, first air chamber 111 is formed in the inside of cylinder shell 11, second air chamber 131 is formed in the inside of energy storage device shell 13, piston striker assembly 6 being axially movable is equipped in cylinder shell 11, piston striker assembly 6 includes fixedly connected piston 62 and striker 61, lifting wheel 3 and locking assembly 2 are respectively equipped in the both sides of the movement path of striker 61, lifting wheel 3, locking assembly 2 are all controlled by motor 1 (the transmission mode between lifting wheel 3 and locking assembly 2 and motor 1 is part of prior art, not detailed in this application), cylinder shell 11 and the side of connection end of energy storage device shell 13 are also equipped with open-close valve 14 and top holding spring 15, open-close valve 14 is blocked the end face of cylinder shell 11 under the action of top holding spring 15, so that first air chamber 111 is disconnected with second air chamber 131, energy storage device shell 13 is also equipped with a drive rod 10, one end of drive rod 10 is connected with open-close valve 14 to form synchronous movement structure, the other end of drive rod 10 extends outside energy storage device shell 13, see Figure 9, the right side of piston 62 in the inside of cylinder shell 11 is defined as first air chamber 111, the size of first air chamber 111 changes with the change of the position of piston 62;Energy storage device shell 13 is connected with cylinder shell 11 by connecting piece 12, for the convenience of connection, the threaded rotation between connecting piece 12 and cylinder shell 11 is preferred, second air chamber 131 includes upper chamber 1311 located outside cylinder shell 11 and lower chamber 1312 located on the other side of cylinder shell 11, upper chamber 1311 and lower chamber 1312 always keep communication state, one end of open-close valve 14 is provided with counterbore, the wall of this counterbore is provided with through hole 142 (open-close valve 14 realizes the role of outward exhaust during opening process by communication hole 142) that is communicated with second air chamber 131;Drive rod 10 is located in upper chamber 1311, for the convenience of processing and assembly, drive rod 10 includes split rod a 101 and rod b 102, rod a 101 includes integral bending part 1011, bending part 1011 is clamped into annular groove 141 of open-close valve 14, to form synchronous movement structure, the other end of rod a 101 away from bending part 1011 is connected with rod b 102 by stacking mode, that is, rod b 102 is stacked on the top of rod a 101, to play the limiting effect of rod a 101;The output shaft of motor 1 is also provided with first cam 4 and second cam 5 that rotate synchronously, first cam 4 is connected with drive rod 10 by transmission rod 8 to form transmission connection, second cam 5 is connected with locking assembly 2 by transmission assembly to form linkage, to realize the locking, unlocking control of striker 61.Machine start, motor 1 drives the output shaft rotation, first cam 4 acts on the roller 7 to the opening and closing valve 14 direction movement, until the opening and closing valve 14 is in the opening mode, synchronous rotation after the second cam 5 and transmission assembly touch, through the transmission assembly and the locking assembly 2 linkage is formed, the unlocking of the striker 61 is realized, the piston striker assembly 6 from the upper stop position to the lower stop position, this time period, with the rotation of the output shaft, the first cam 4 and the roller 7 touch, the roller 7 continues to move to the opening and closing valve 14 direction, the opening and closing valve 14 runs to the maximum stroke opening position, until the roller 7 and the first cam 4 are out of contact, the roller 7 moves to the opening and closing valve 14 reverse direction reset, the opening and closing valve 14 moves to the cylinder shell 11 end surface to the cylinder shell 11 end surface, the first gas chamber 111 and the second gas chamber 131 are separated, the roller 7 and the first cam 4 are no longer in contact; the output shaft of the motor 1 rotates, the lifting wheel 3 drives the piston striker assembly 6 from the lower stop position to the upper stop position, in this process, the volume of the first gas chamber 111 gradually decreases, the gas pressure gradually increases, until the pressure drives the opening and closing valve 14 to move away from the end surface of the cylinder shell 11, the gas in the first gas chamber 111 flows into the second gas chamber 131, until the pressure of the first gas chamber 111 and the second gas chamber 131 is equal, the opening and closing valve 14 is pushed by the holding spring 15, the opening and closing valve 14 returns to the end surface of the cylinder shell 11, the first gas chamber 111 and the second gas chamber 131 are separated, the roller 7 and the first cam 4 are not in contact; for easy processing, the first cam 4 and the second cam 5 are integral, the radial displacement of the second cam 5 to the output shaft center line X is greater than that of the first cam 4 to the output shaft center line X; one end of the transmission rod 8 is fixedly connected with the rod b102 through a fastener, the other end of the transmission rod 8 is provided with the roller 7, and the roller 7 and the first cam 4 are always in contact during the opening and closing valve 14 opening to the maximum stroke; the rod b102 is provided with a sealing ring 103, the upper chamber 1311 and the outside are sealed by the sealing ring 103, and the energy accumulator housing 13 is provided with a bolt 17, which limits the movement position of the rod b102; the rod b102 is also provided with a supporting spring 9, and the two ends of the supporting spring 9 act between the transmission rod 8 and the energy accumulator housing 13.

[0026] The opening and closing of the first gas chamber and the second gas chamber is realized by the movement of the opening and closing valve, when the piston striker assembly is at the upper stop position, the opening and closing valve blocks the end surface of the cylinder shell, the piston striker assembly only receives the internal energy of the compressed gas in the first gas chamber, the gas capacity in the first gas chamber is small, the generated internal energy is small, the initial kinetic energy of the piston striker assembly due to the failure of the parts is small, the piston striker assembly moves a small distance along the axis, and the striker stops without contacting the driving fastener, thereby avoiding accidental injury, prolonging the service life of the product and improving the safety.

[0027] In specific use, for the convenience of understanding the utility model, the description is made in combination with the drawings.

[0028] Referring to Fig. 6, at this time, the locking assembly 2 locks the striker 61, at this time, because the opening and closing valve 14 blocks the end face of the cylinder shell 11, the first gas chamber 111 and the second gas chamber 131 are not communicated, the striker 61 is not affected by the gas pressure of the second gas chamber 131;

[0029] Referring to Fig. 7, the motor 1 drives the first cam 4 and the second cam 5 to rotate synchronously, wherein the first cam 4 first contacts and acts on the roller 7, so that the transmission rod 8 and the driving rod 10 move synchronously to the right in the axial direction, so that the opening and closing valve 14 also moves to the right synchronously, so that the first gas chamber 111 and the second gas chamber 131 are communicated, and the striker 61 is affected by the gas pressure of the second gas chamber 131;

[0030] Referring to Fig. 8, the motor 1 continues to rotate, the progress of the roller 7 relative to the first cam 4 remains unchanged, that is, the opening and closing valve 14 remains in the open state, and the second cam 5 acts on the locking assembly 2 through the transmission assembly, so that the locking assembly 2 completes the unlocking of the striker 61;

[0031] Referring to Fig. 9, after the locking assembly 2 completes the unlocking of the striker 61, the gas pressure makes the striker 61 be fired, and the striker 61 moves from the upper stop position to the lower stop position; then, the roller 7 is separated from the first cam 4, so that the opening and closing valve 14 is reset under the action of the retaining spring 15, that is, the opening and closing valve 14 blocks the end face of the cylinder shell 11 again, and the first gas chamber 111 and the second gas chamber 131 are disconnected again;

[0032] Then, the lifting wheel 3 drives the striker 61 to reset to the upper stop position to return to the initial state.

[0033] The present patent application does not limit the size and detailed description of the contour shape and stroke of the first cam 4 and the second cam 5, and as long as the sequence of the nail driving process is met, that is, the opening and closing valve 14 is opened first, and then the unlocking assembly 2 is unlocked.

[0034] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas chamber on-off control device of a gas spring type electric tool, comprising a cylinder housing (11), an energy accumulator housing (13) fixed in position relative to the cylinder housing (11), the right side of the cylinder housing (11) and the right side of the energy accumulator housing (13) being closed by end covers (16), a first gas chamber (111) being formed inside the cylinder housing (11), a second gas chamber (131) being formed inside the energy accumulator housing (13), an axially movable piston hammer assembly (6) being arranged in the cylinder housing (11), the piston hammer assembly (6) comprising a fixed piston (62) and a hammer (61), a lifting wheel (3) and a locking assembly (2) being arranged on both sides of the movement path of the hammer (61) respectively, the lifting wheel (3) and the locking assembly (2) being controlled by a motor (1), characterized in that: The cylinder shell (11) and the energy storage shell (13) are connected, the second chamber (131) includes an upper chamber (1311) outside the cylinder shell (11) and a lower chamber (1312) on the other side of the cylinder shell (11), the upper chamber (1311) and the lower chamber (1312) are always in communication, the opening and closing valve (14) has a counterbore with a through hole (142) in communication with the second chamber (131).

2. The air chamber on-off control device of a gas spring type electric power tool according to claim 1, characterized in that: The driving rod (10) is located in the upper chamber (1311), the driving rod (10) includes a rod a (101) and a rod b (102), the rod a (101) includes an integral bending part (1011), the bending part (1011) is clamped into the ring groove (141) of the opening and closing valve (14) to form a synchronous movement structure.

3. The air chamber on-off control device of a gas spring type electric power tool according to claim 2, characterized in that: The output shaft of the motor (1) is also provided with a first cam (4) and a second cam (5) rotating synchronously, the first cam (4) is in transmission connection with the driving rod (10) through a transmission rod (8), and the second cam (5) is in linkage with the locking assembly (2) through a transmission assembly to realize the locking and unlocking control of the striker (61).

4. The air chamber on-off control device of a gas spring type electric power tool according to claim 3, characterized in that: The first cam (4) and the second cam (5) are an integral part, and the radial displacement of the second cam (5) to the output shaft center line X is greater than that of the first cam (4) to the output shaft center line X.

5. The air chamber on-off control device of a gas spring type electric power tool according to claim 4, characterized in that: One end of the transmission rod (8) is fixedly connected with the rod b (102) through a fastener, and the other end of the transmission rod (8) is provided with a roller (7), which is always in contact with the first cam (4) during the opening of the opening and closing valve (14) to the maximum stroke.

6. The air chamber on-off control device of a gas spring type electric power tool according to claim 4 or 5, characterized in that: The rod b (102) is provided with a sealing ring (103), which forms a seal between the upper chamber (1311) and the outside, and the energy storage shell (13) is provided with a latch (17), which limits the activity position of the rod b (102).

7. The air chamber on-off control device of a gas spring type electric power tool according to claim 6, wherein: The rod b (102) is also provided with a supporting spring (9), and the two ends of the supporting spring (9) act between the transmission rod (8) and the energy storage shell (13) respectively.

8. The air chamber on-off control device of a gas spring type electric power tool according to claim 7, characterized in that: ​

Images