CN2897564Y - Pneumatic tools with stable pressure and limited torque - Google Patents

Abstract

The utility model discloses a pneumatic tool that utensil steady voltage limit was turned round, it mainly includes a body, one locate this internal cylinder and a rotatable rotor of being connected in locating the air chamber of cylinder and with body spanner head. The body is provided with a grab handle and one end of the body is provided with a wrenching head; the air cylinder is internally provided with a forward air passage, a reverse air passage and an air chamber, the air cylinder is provided with a forward air groove communicated between the forward air passage and the air chamber and a reverse air groove communicated between the reverse air passage and the air chamber, one side of the air cylinder opposite to the forward air passage and the reverse air passage is provided with a plurality of exhaust holes communicated with the air chamber, and a pressure relief passage is arranged between the forward air passage and the exhaust holes; the rotor is provided with a plurality of blades driven by high-pressure gas on the periphery. The utility model can apply high torque to the work piece when the rotation and loosening are reversed, and apply low torque to the work piece when the rotation and tightening are positive.

Description

Pneumatic tools with stable pressure and limited torque

Technical field:

The utility model relates to a pneumatic tool, in particular to a pneumatic tool with the function of stabilizing pressure and limiting torque by using a cylinder.

Background technique:

Press, the traditional pneumatic torque limiting tool is fixed on the air intake adjustment dial switch of the gun body to control the amount of air intake to control the torque of the pneumatic tool, but the air intake adjustment dial switch on the air tool is fixed. In fact, it is a rather unstable design, and it is easy to cause unstable output of the torque limiting function of the pneumatic wrench due to the problem of processing size or the size of the intake pressure. Then someone designed the following structure:

With reference to the "Cylinder Structure of Pneumatic Tools" case of Taiwan Patent Publication No. 566300, it mainly includes a cylinder and a rotor pivotally arranged in the cylinder. The cylinder has an eccentric air chamber, and the two sides of the air chamber are designed with different curvatures. The cylinder is provided with an air inlet and a back pressure outlet on the side wall of the end face, and an air outlet is opened on the opposite side for exhaust. Blades are arranged on the periphery of the rotor to drive the rotor to rotate.

This known structure utilizes wall edges with different curvatures on both sides of the air chamber to expand the distance between the rotor and the air chamber, increase the volume of each air-containing area, and then make the blades drive the rotor to rotate rapidly, achieving The effect of increasing the torque can prevent the problem of high cost from happening at the same time.

But the wall thickness of the cylinder is limited, so the torque that can be increased is also limited, and it is not easy to make the air chambers with different curvatures into smooth circular arc continuous segments.

In actual use, there are still many occasions where it is desired that the pneumatic tool has a high torque to quickly release the work object during the loosening action, and a low torque to tighten the work object during the tightening action to avoid work. The object is damaged by turning with excessive torque.

Utility model content:

Aiming at the deficiencies of the prior art, the utility model provides a stable tool that can apply high torque to the work object during the reverse unscrewing action, and apply low torque force to the work object during the forward rotation tightening action. Compression limited torque pneumatic tools.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a pneumatic tool with stable pressure and limited torque, which mainly includes a body, a cylinder in the body and a rotatable air chamber in the cylinder. And the rotor connected with the trigger head of the body, one end of the body is provided with a trigger head; the cylinder is provided with a forward rotation air passage, a reverse rotation air passage and an air chamber, and the cylinder is provided with a forward rotation air passage and an air chamber. The forward rotation air groove between the air chambers, and a reverse air groove connected between the reverse air passage and the air chamber, the side of the cylinder opposite to the forward and reverse air passages is provided with several exhaust ports connected with the air chamber. The cylinder has a pressure relief channel between the positive rotation air channel and the exhaust hole; the rotor is provided with several blades driven by high-pressure gas on the peripheral side.

The size of the communicating portion between the reverse rotation air groove and the air chamber is larger than the communicating portion between the forward rotation air groove and the air chamber. The cylinder also provides a first pressure stabilizing passage between the forward rotation air passage and the pressure relief passage. A second pressure stabilizing channel is also provided between the pressure relief channel and the first pressure stabilizing channel. The cylinder is provided with two pressure relief passages. The exhaust holes are biased to the side of the forward-rotating air passage.

Compared with the prior art, the utility model has the advantages that: the size of the communicating part of the reverse air groove and the air chamber is larger than the communicating part of the forward rotating air groove and the air chamber, so that high torque can be obtained when the rotor reverses , while maintaining low torque during forward rotation; through the cylinder, a pressure relief passage is opened between the forward rotation air passage and the exhaust hole to provide a pressure relief effect and reduce the torque of the rotor during forward rotation; The cylinder is also provided with a first pressure stabilizing channel and a second pressure stabilizing channel between the forward rotation air channel and the pressure relief channel, and the gas flow rate provided by the first pressure stabilizing channel is less than that of the pressure releasing channels The provided gas flow can form a pressure relief effect to achieve the effect of pressure stabilization.

Other objects, advantages and novel features of the present invention will be more apparent from the following detailed description and associated drawings.

Description of drawings:

Fig. 1 is a three-dimensional appearance view of the utility model.

Fig. 2 is a three-dimensional exploded view of the utility model.

Fig. 3 is a side view of the utility model.

Fig. 4 is a state diagram when the utility model is reversed.

Fig. 5 is a state diagram of the utility model during forward rotation.

Fig. 6 is a state diagram of the utility model when it is rotating forward.

Label description:

10 Body 11 Handle

12 wrench head

20 Cylinder 21 Forward rotation airway

211 Forward rotation air slot 22 Reverse airway

221 Reverse air groove 23 Air chamber

24 Vent hole 25 Pressure relief channel

26 The first voltage stabilization channel 27 The second voltage stabilization channel

30 rotor 31 blade

40 Capping 41 Wear-resistant sheet

Detailed ways:

Regarding the technology, means and effects adopted by the present utility model, a preferred embodiment is given and described in detail below in conjunction with the drawings. This is only for illustration, and is not limited by this structure in the patent application.

With reference to Fig. 1 to Fig. 3, the utility model mainly comprises a body 10, a cylinder 20 and a rotor 30; discharge, to achieve the effect of limiting the torque of the rotor 30. in:

The main body 10 has a handle 11 for holding, and a wrenching head 12 is provided at one end for tightening or loosening the working object.

The cylinder 20 is installed in the main body 10 , and two ends of the cylinder 20 are respectively provided with a cover 40 , and a wear-resistant plate 41 is provided between the cylinder 20 and the cover 40 . The cylinder 20 is provided with a longitudinally extending forward rotation air passage 21 , a reverse rotation air passage 22 and an eccentric air chamber 23 . The cylinder 20 is also provided with a forward rotation air groove 211 connected between the forward rotation air passage 21 and the air chamber 23 at the end, and a reverse rotation air groove 221 connected between the reverse rotation air passage 22 and the air chamber 23 . Wherein, the size of the connecting portion between the reverse rotation air groove 221 and the air chamber 23 is larger than the connecting portion between the forward rotation air groove 211 and the air chamber 23 (as shown in FIG. 4 ).

The side of the cylinder 20 opposite to the forward and reverse air passages 21, 22 is provided with several exhaust holes 24 communicating with the air chamber 23. side. And this cylinder 20 is provided with two pressure relief passages 25 between the forward rotation air passage 21 and the exhaust hole 24 (that is, the forward rotation position). The gas flow rate provided by the air hole 24.

The cylinder 20 also has a first pressure stabilizing channel 26 between the forward rotation air channel 21 and the pressure relief channel 25, and the gas flow rate consumed by the first pressure stabilizing channel 26 is less than that consumed by the pressure relief channels 25. The gas flow rate, in order to provide a stabilizing effect. And between this pressure release channel 25 and the first pressure stabilizing channel 26, also can offer the second stabilizing channel 27, the gas flow rate that this second stabilizing channel 27 consumes, between these pressure releasing channels 25 and the first Between the gas flows provided by a pressure stabilizing passage 26, the intake air flow is prevented from being too large and the pressure stabilizing effect is provided. In this embodiment, the gas flux provided by the second pressure stabilizing channel 27 is equal to the gas flux provided by the first stabilizing channel 26 .

The rotor 30 is rotatably disposed in the air chamber 23 of the air cylinder 20 to provide the effect of the main body 10 turning the head 12 to rotate. The rotor 30 is further provided with a plurality of radially movable blades 31 on the peripheral side. The blades 31 are driven by the high-pressure gas to contact the inner side of the air chamber 23 and drive the rotor 30 to rotate.

With reference to Fig. 4, it is the state that the utility model reverses and uses. When the high-pressure gas enters the air chamber 23 of the cylinder 20 from the reverse air channel 22 , it flows into the air chamber 23 through the reverse air groove 221 . (The following description will be based on the twelve o'clock direction at the top of the drawing.) Since the communication part between the reverse air groove 221 and the air chamber 23 extends from the eight o'clock direction to the eleven o'clock direction, a large amount of high pressure can be provided. The gas enters the air chamber 23 to push the vanes 31 at the ten o'clock and eight o'clock directions, driving the rotor 30 to reverse with high torque.

It should be noted that the gas located between the two blades 31 in the direction of six and eight o’clock has not yet been discharged out of the air chamber 23, because the blade 31 in the direction of six o’clock does not exceed the position of the exhaust hole 24, so there is still a pressure to drive the rotor 30 is reversed, until the blade 31 passes over the exhaust hole 24, the gas is discharged out of the air chamber 23. In this way, during the process of unscrewing the working object, the effect of releasing the working object with a large torque can be obtained, and the working object can be unscrewed quickly after being loosened, which is very convenient to use.

Referring to Fig. 5, it is the forward rotation use state of the utility model. When the high-pressure gas enters the air chamber 23 of the cylinder 20 from the forward rotation air passage 21 , it flows into the air chamber 23 through the forward rotation air groove 211 . Because the communicating part of this positive rotation air tank 211 and the air chamber 23 extends from the one o'clock direction to the two o'clock direction (shorter than the communicating part of the reverse air tank 221), the gas flow rate entering the air chamber 23 is relatively small. When it is reversed, it is less, and only the blade 31 in the direction of two o'clock is pushed to drive the rotor 30 to rotate forward with a smaller torque than the reversed torque.

When the rotor 30 rotates forward and the blade 31 skims over the first stabilizing passage 26, or when skimming over the second stabilizing passage 27 (as shown in Figure 6), the high-pressure gas that pushes the vane 31 will have a small amount of gas passing through the first stabilizing passage. The first and second pressure stabilizing passages 26, 27 are discharged outside the air chamber 23, at this time, excessive intake air can be prevented, and the designed pressure relief effect can be achieved, and the pressure stabilizing effect can be achieved. That is to say, the blade 31 is driven by the high-pressure gas to reduce the force, so that the torque of the rotor 30 when it rotates forward is lower than that when it rotates reversely.

Then, when the rotor 30 continues to rotate forward and the blades 31 pass over the pressure relief passage 25 (as shown in FIG. 5 ), the high-pressure gas that pushes the blades 31 will have a large amount of gas discharged out of the air chamber 23 through the pressure relief passage 25 , At this time, a complete pressure relief effect is formed, and the effect of complete pressure relief is achieved. That is to say, the vane 31 at the four o'clock direction almost loses the force driven by the high-pressure gas, so that the torque of the rotor 30 when it rotates forward is more obviously reduced. The gas between the two blades 31 at four and six o'clock is discharged outside the air chamber through the exhaust hole 24, and the waste gas between the four blades 31 at six to twelve o'clock is released by the reverse air passage 22.

To put it simply, when the rotor 30 reverses, it is driven by three blades 31 in the directions of six, eight and ten o'clock, so the effect of reverse rotation with a large torque can be obtained. And when the rotor 30 rotates forward, because the pressure relief passages 25 and the pressure stabilizing passages 26, 27 discharge the high-pressure gas out of the air chamber 23, only one vane 31 in the two o'clock direction drives the rotor 30. In this way, during the process of tightening the workpiece, the effect of rotating the workpiece with low torque is obtained, and the workpiece is not easily damaged after being tightened.

But the above are only preferred embodiments of the present utility model, and should not limit the scope of implementation of the present utility model, so the changes of numerical values or the replacement of equivalent components, or the changes made according to the scope of rights of the present utility model Equal changes and modifications should still fall within the scope of the utility model patent.

Claims (6)

1. A pneumatic tool with stable pressure and limited torque mainly includes a body, a cylinder located in the body and a rotatable rotor located in the air chamber of the cylinder and connected with the body actuating head, characterized in that: One end of the body is provided with a trigger head; the cylinder is provided with a forward rotation air passage, a reverse rotation air passage and an air chamber, and the cylinder is provided with a forward rotation air groove connected between the forward rotation air passage and the air chamber, And a reverse air groove connected between the reverse air passage and the air chamber, the cylinder is opposite to the positive and reverse air passages, and has several exhaust holes connected with the air chamber. There is a pressure relief passage between the exhaust holes; the rotor is provided with several vanes driven by high-pressure gas on the peripheral side. 2. The pneumatic tool with constant pressure and torque limitation according to claim 1, characterized in that: the size of the connecting portion between the reverse rotation air groove and the air chamber is larger than the connecting portion between the forward rotation air groove and the air chamber. 3 . The pneumatic tool with pressure stabilization and torque limitation as claimed in claim 2 , wherein the cylinder further defines a first pressure stabilization passage between the forward rotation air passage and the pressure relief passage. 4 . 4 . The pneumatic tool with constant pressure and torque limiting as claimed in claim 3 , wherein a second steady pressure path is provided between the pressure relief path and the first steady pressure path. 4 . 5. The pneumatic tool with stable pressure and limited torque as claimed in claim 1 or 2 or 3 or 4, characterized in that: said cylinder is provided with two pressure relief passages. 6 . The pneumatic tool with constant pressure and limited torque as claimed in claim 5 , wherein the exhaust hole is biased toward the side of the forward-rotating air passage. 7 .

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