TWM576526U - Forward-reverse rotation control structure of pneumatic tool - Google Patents

Abstract

A positive and negative control structure of a pneumatic tool, comprising a casing tube provided with a cylinder group, wherein the bottom wall is provided with two through holes, and a flow guiding column is extended, which is provided with a gas flow path and a gas outlet; The flow column is closely connected with a rotatable control ring, which is abutted against the bottom wall, and is sealed with a sealing ring between the bottom wall and the flow guiding column; a control flow channel is arranged inside the control ring, and the control ring can be rotated by The control flow channel is selected to communicate with one of the through holes of the bottom wall to control the forward and reverse rotation of the pneumatic tool.

Description

Positive and negative control structure of pneumatic tools

This creation is related to pneumatic tools, especially a structure that controls the positive and negative actuation of a pneumatic tool.

Figures 7 and 8 show a conventional pneumatic tool having a cylinder group 6 which is driven by a high-pressure gas to generate a forward or reverse rotation, wherein the forward or reverse rotation of the cylinder group 6 is The control member 7 that is rotated by operation is switched. In the above-mentioned conventional device, the cylinder group 6 and the control member 7 are housed in a casing 8 having a body 61 and a rear cover 62. The rear cover 62 is provided with two gas flow passages 63. And 64, respectively, for the gas to enter and drive to generate the forward rotation and the reverse rotation, and the control member 7 is internally provided with a control flow passage 71 connecting the external high pressure gas, and the control member 7 can be operatively rotated to make the control The flow path 71 is selected to communicate with one of the gas flow paths 63, 64 of the cylinder group 6, for guiding the high pressure gas into the cylinder group 6, and to generate a corresponding direction of rotation.

The control member 7 is abutted against the rear cover 62, thereby connecting the control flow path 71 and the gas flow paths 63, 64. Because of the reason for avoiding air leakage and affecting the driving efficiency, the end faces of the two must be extremely flat, and they can be very closely abutted, but the technical and cost problems of extremely high machining accuracy are caused.

Moreover, this conventional structure encounters a dilemma in assembly, that is, the control member 7 must be in close contact with the rear cover 61 to avoid air leakage, but if the two are too tight, the control will be caused. The piece 7 is difficult to handle the problem of rotation. Moreover, the width of the body 61 of the cylinder group 6 is slightly larger than the rear cover 62, and the inner wall of the casing 8 protrudes inwardly from the first edge 81, and the rear cover 62 is disposed under the edge 81, and the body 61 is assembled. Above the step edge 81, while the rear cover 62 abuts against the control member 7, the body 61 is blocked by the step edge 81, whereby the control member 7 can be smoothly rotated. However, based on the design limitation of the overall size of the pneumatic tool, the edge 81 can only have a very small thickness, resulting in a low structural strength, which is liable to be crushed and collapsed, resulting in damage to the pneumatic tool.

In view of this, how to improve the above problems is the primary issue that the creative office wants to solve.

The main purpose of the present invention is to provide a forward and reverse control structure of a pneumatic tool, which improves the arrangement of the components of the control structure, so that the components can not break the structure of each other while being in close contact with each other, and can achieve smooth operation. .

For the purpose of the foregoing, the present invention provides a positive and negative control structure for a pneumatic tool, the pneumatic tool including an air intake seat for connecting an external high pressure gas, the air inlet block being connected to a cylinder block, the cylinder group being connected to a tool a head, wherein the cylinder block is provided with a rear cover, the rear cover is provided with a first through hole and a second through hole, wherein the first through hole allows airflow into the cylinder group to drive the tool head along a defined forward direction Rotating, the second through hole can drive the airflow into the cylinder group to drive the tool head to rotate in a reverse direction opposite to the forward direction; the forward and reverse control structure comprises: a casing for the cylinder group to be assembled, The bottom wall has a bottom hole corresponding to the first through hole, and a fourth through hole corresponding to the second through hole; the bottom wall a first annular groove is disposed on the outer circumference, and a first sealing ring is embedded therein; the bottom wall is provided with a flow guiding rod extending outwardly from the outer casing, and is provided with a gas flow path and connected to the air inlet The gas flow path is provided on a side of the flow guide column a gas outlet; the flow guiding column is respectively provided with a second ring groove and a third ring groove on both sides of the gas outlet, and a second sealing ring and a third sealing ring are respectively embedded therein; a control ring, which can Rotatingly sleeved on the flow guiding column; the control ring has an axial end surface and a radial inner annular surface, wherein the end surface abuts against the bottom wall, and is provided with a first annular groove surrounding the first annular groove a ring wall of a sealing ring, the inner ring surface is in close contact with the flow guiding column, and surrounds the second ring groove and the third ring groove and presses the second sealing ring and the third sealing ring; a control flow channel having a control inlet formed on the inner annular surface and a control outlet formed on the end surface; the control ring is rotatable between a first position and a second position when the control ring is located In the first position, the control outlet communicates with the third through hole. When the control ring is in the second position, the control outlet communicates with the fourth through hole, and the control ring is within the rotation range, and the control inlet Always connect the gas outlet.

In an embodiment, a gasket is disposed between the control ring and the air inlet seat, and the gasket is pressed against a plurality of springs disposed on the air inlet seat to abut the control ring, thereby making the control ring The end face abuts against the bottom wall by the force of the spring.

In one embodiment, the casing is provided with a covered outer casing, and the outer casing abuts against the annular wall of the control ring; the bottom end of the outer casing is provided with a limiting slot, and the annular wall is provided with a protruding portion a limiting block of the limiting slot, the limiting block respectively abutting one end of the limiting slot when the control ring is in the first position or the second position.

The above objects and advantages of the present invention are not to be understood in detail from the detailed description and the accompanying drawings.

Please refer to Figures 1 to 3 for the forward and reverse control structure of the pneumatic tool provided for this creation. The pneumatic tool mainly comprises an air inlet seat 11 for connecting external high-pressure gas, a cylinder group 12 and a tool head 13, and the three are sequentially connected to introduce high-pressure gas into the cylinder group 12, thereby driving the tool head 13 to rotate. . The cylinder block 12 has a rear cover 121, and a first through hole 122 and a second through hole 123 are respectively connected to the cylinder block 12 in different paths, so that airflow can enter the cylinder group 12 and drive the cylinder. The group 12 rotates in different directions, thereby driving the tool head 13 to rotate in a corresponding direction; wherein the first through hole 122 is defined to enable the airflow to drive the tool head 13 to rotate in a defined forward direction, and the second through hole 123 can make the airflow The tool head 13 is driven to rotate in a reverse direction opposite to the aforementioned forward direction.

The cylinder block 12 is housed in a casing 2 having a bottom wall 21 against which the rear cover 121 is attached. The bottom wall 21 defines a third through hole 211 corresponding to the first through hole 122 and a fourth through hole 212 correspondingly connected to the second through hole 123. A guide column 22 extending outwardly from the casing 2 is disposed at a center of the bottom wall 21, and a gas flow passage 23 is disposed therein and connected to the air inlet seat 11, and a side of the flow guide column 22 is disposed. The gas outlet 24, for guiding the high pressure gas, enters the gas flow path 23 and is discharged from the gas outlet 24.

The guide bar 22 is sleeved with a rotatable control ring 3 having an axial end face 31 and a radially inner annular face 32. The end face 31 is abutted against the bottom wall 21, and the inner end 31 The annular surface 32 is in close contact with the flow guide column 22. A control flow channel 33 is defined in the control ring 3, and a control inlet 34 is formed on the inner ring surface 32, and a control outlet 35 is formed on the end surface 31. With the rotation of the control ring 3, the control inlet is formed. The position of 34 and control outlet 35 will change accordingly. After the control ring 3 is sleeved on the guide rod 22, the intake seat 11 is fixed in position by the fixed connection of the air inlet block 11 and the air guide block 22.

The control ring 3 described above must indeed abut against the bottom wall 21, but it must not be too tight to cause the control ring 3 to rotate. Therefore, in the embodiment, a spacer 4 is disposed between the control ring 3 and the air inlet 11 , and the air inlet 11 is provided with a plurality of receiving slots 111 , and a spring is disposed in each of the receiving slots 111 . 41. Each spring 41 is biased against the spacer 4 against the control ring 3, so that the end surface 31 of the control ring 3 is pressed against the bottom wall 21 by the force of the spring 41. Accordingly, the force of the control ring 3 against the bottom wall 21 can be adjusted by the spring 41 without being too tight.

In addition, a first annular groove 25 is defined in the outer periphery of the bottom wall 21, and a first sealing ring 51 is embedded therein, and an end wall 31 of the control ring 3 is provided with a ring wall 36 surrounding the first annular groove 25. And pressing the first seal ring 51. On the other hand, the second guide ring 26 and the third annular groove 27 are respectively disposed on the two sides of the gas outlet 24, and a second sealing ring 52 and a third sealing ring 53 are respectively embedded. The inner annular surface 32 of the control ring 3 surrounds the second annular groove 26 and the third annular groove 27 and presses the second sealing ring 52 and the third sealing ring 53. By the seal rings 51, 52, and 53 described above, it is possible to prevent gas from leaking at the place where it is placed, thereby affecting the driving efficiency.

With the above structure, the control ring 3 can be operated to rotate relative to the guide column 22 between a first position and a second position, thereby controlling the tool head 13 to be driven in forward or reverse rotation. In detail, the gas outlet 24 of the guide column 22 has a sufficient width such that the control inlet 34 of the control ring 3 always communicates with the gas outlet 24 between the first position and the second position, so that the gas can Enter the control flow path 33. When the control ring 3 is rotated to the first position as shown in FIG. 4, the control outlet 35 of the control ring 3 is connected to the third through hole 211 of the bottom wall, and the gas can be guided into the third The through hole 211 enters the cylinder block through the first through hole of the back cover, thereby driving the tool head to rotate in the forward direction. On the other hand, when the control ring 3 is rotated to the second position as shown in FIG. 5, the control outlet 35 of the control ring 3 is connected to the fourth through hole 212 of the bottom wall, and the gas can be guided. The fourth through hole 212 is inserted into the cylinder block through the second through hole of the back cover, thereby driving the tool head to rotate in the reverse direction.

In the present embodiment, as shown in FIG. 2, the casing 2 is provided with a covered outer casing 14 whose bottom end abuts against the annular wall 36 of the control ring 3. The bottom end of the outer casing 14 is provided with a limiting slot 15 . The annular wall 36 defines a limiting block 37 extending into the limiting slot 15 . The limiting block 37 can be rotated along with the rotation of the control ring 3 . The bit slot 15 moves. As shown in FIG. 4 and FIG. 5 , when the control ring 3 is located at the first position or the second position, the limiting block 37 respectively abuts one end of the limiting slot 15 , thereby limiting the control ring 3 . The range of rotation is not excessive.

The present invention is characterized in that the first, second and third sealing rings 51, 52, 53 block the gap between the control ring 3 and the abutting member to enhance the function of preventing gas leakage, whereby the control ring 3 does not need to be adjacent to When the member is too tight, the air leakage can be prevented, thereby avoiding the purpose of mutual wear and damage between the components, and the control ring 3 can be smoothly rotated at the same time to improve the operability.

In addition to the function of switching the forward and reverse rotation of the pneumatic tool, the control ring 3 has a function of adjusting the intake air amount to control the driving air pressure. In detail, as shown in FIG. 6, when the control ring 3 is rotated and its control outlet 35 does not completely overlap with the third through hole 211 or the fourth through hole 212 of the bottom wall, only a partial area overlaps, That is, the area of the gate is reduced, and the amount of gas entering the third through hole 211 or the fourth through hole 212 is reduced, and the air pressure for driving the tool bit is reduced.

However, the above description of the embodiments is merely illustrative of the present invention and is not intended to limit the present invention. Therefore, the replacement of equivalent elements should still be within the scope of the present invention.

In summary, it can be made clear to the skilled person that the creation can achieve the aforementioned objectives, and it has already met the requirements of the Patent Law and submitted an application according to law.

11‧‧‧Intake seat

111‧‧‧ accommodating slots

12‧‧‧ cylinder group

121‧‧‧Back cover

122‧‧‧First through hole

123‧‧‧Second through hole

13‧‧‧Tool head

14‧‧‧Shell

15‧‧‧Limited slot

2‧‧‧ shell

21‧‧‧ bottom wall

211‧‧‧ third through hole

212‧‧‧4th through hole

22‧‧‧draft column

23‧‧‧ gas flow path

24‧‧‧ gas export

25‧‧‧First ring groove

26‧‧‧Second ring groove

27‧‧‧ Third ring groove

3‧‧‧Control loop

31‧‧‧ end face

32‧‧‧ Inner torus

33‧‧‧Control flow channel

34‧‧‧Control entrance

35‧‧‧Control export

36‧‧‧Circle wall

37‧‧‧Limited blocks

4‧‧‧shims

41‧‧‧ Spring

51‧‧‧First seal ring

52‧‧‧Second seal ring

53‧‧‧ Third sealing ring

6‧‧‧ cylinder group

61‧‧‧Ontology

62‧‧‧Back cover

63, 64‧‧‧ gas flow channels

7‧‧‧Controls

71‧‧‧Control flow channel

8‧‧‧Shell

81‧‧‧

The first picture is a three-dimensional schematic diagram of the creation; the second picture is a three-dimensional exploded view of the creation; the third picture is a schematic cross-sectional view of the creation; the fourth and fifth pictures are schematic diagrams of the use state of the control ring switching between forward and reverse rotation Fig. 6 is a schematic view showing the state of use of the control loop to adjust the intake air amount; Fig. 7 is a perspective exploded view of the conventional structure; and Fig. 8 is a schematic cross-sectional view of the conventional structure.

Claims (3)

A positive and negative control structure of a pneumatic tool, the pneumatic tool comprising an air inlet seat for connecting an external high pressure gas, the air inlet seat is connected to a cylinder block, the cylinder group is connected to a tool head, wherein the cylinder group is provided with a rear a cover, the back cover is provided with a first through hole and a second through hole, wherein the first through hole allows the airflow to enter the cylinder group to drive the tool head to rotate in a defined forward direction, the second through hole After the airflow enters the cylinder group, the tool head is driven to rotate in a reverse direction opposite to the forward direction; the forward and reverse control structure includes: a casing for the cylinder group to be assembled, and the casing has a back cover a bottom wall, the bottom wall is provided with a third through hole correspondingly connected to the first through hole, and a fourth through hole correspondingly connected to the second through hole; a first ring groove is arranged on the outer periphery of the bottom wall. And a first sealing ring is embedded therein; the bottom wall is provided with a guiding column extending outwardly from the casing, and is provided with a gas flow channel and connected to the air inlet, the gas flow channel is in the diversion a gas outlet is arranged on the side of the column; the gas guiding column is connected to the gas a second ring groove and a third ring groove are respectively disposed on two sides of the outlet, and a second sealing ring and a third sealing ring are respectively embedded in the outlet; a control ring is rotatably sleeved on the guiding column; The control ring has an axial end surface and a radial inner annular surface, wherein the control ring is rebounded by a plurality of springs disposed on the air inlet seat such that the end surface abuts against the bottom wall by spring force; The end surface is provided with a ring wall surrounding the first ring groove and pressing the first sealing ring, and the inner ring surface is in close contact with the flow guiding column, and surrounds the second ring groove and the third ring groove and presses the second sealing a control ring is formed inside the control ring, and a control inlet is formed on the inner ring surface, and a control outlet is formed on the end surface; the control ring can be in a first position Rotating between a second position, the control outlet is connected to the third through hole when the control ring is in the first position, and the control outlet is connected to the fourth through hole when the control ring is in the second position, And the control ring is within the above rotation range, the control inlet is always connected Pass the gas outlet. The positive and negative control structure of the pneumatic tool according to claim 1, wherein a gap is disposed between the control ring and the air inlet seat, and the spring pushes against the gasket to make the gasket abut the control ring. on. The forward and reverse control structure of the pneumatic tool of claim 1, wherein the casing is provided with a covered outer casing, the outer casing abutting the annular wall of the control ring with the bottom end thereof; a limiting slot, the ring wall is provided with a limiting block extending into the limiting slot, and the limiting block respectively abuts one end of the limiting slot when the control ring is in the first position or the second position.