CN104827437B - A kind of pneumatic impact spanner for power industry determine torque force device - Google Patents

Abstract

The invention relates to a constant torque device for a pneumatic wrench used in the electric power industry, which comprises a cylindrical barrel with one end closed and the other open, a central shaft, a support body mounted on the open end of the barrel through a set screw, and a The inner spring sheet close to the closed end in the cylinder and the outer spring sheet structure installed in the cylinder close to the support body. When bolting, according to the specified torque, adjust the size and quantity of the spring pieces in the torque ring to set it to the required torque, which is convenient and simple to adjust. When the torque of the tightened screw and nut reaches the required torque, the cylinder is subjected to an equal reaction torque. At this time, the spring piece enters the stage of elastic deformation. Due to the elastic deformation, the spring piece will slip out of the ratchet groove in the cylinder. , the spring leaf rotates relative to the cylinder, so that the cylinder stops to select and the tightened screws and nuts are no longer stressed.

Description

A constant torque device for pneumatic wrench used in electric power industry

technical field

The present invention is a divisional application of an invention patent with the application date of "April 11, 2012", the application number of "2012101037057", and the title of "A Constant Torque Device for Pneumatic Wrench".

Background technique

Pneumatic wrench is a high-efficiency mechanical tool for disassembling screws and nuts, and it has a wide range of uses in the power industry. In the machinery manufacturing industry, bolts and nuts are used the most besides individual parts on the assembly line. To a large extent, the quality of a product does not lie in the quality of each part, but in the quality of assembly.

At present, the widely used pneumatic wrench in China is generally divided into two categories, one is the conventional impact wrench, and the other is the pulse pneumatic wrench. The difference between the two is that the former cannot determine the torque, while the latter can, but the equipment is expensive. .

The assembly workshops of large factories often use high-efficiency pneumatic wrenches to tighten bolts. However, bolts of different specifications and different parts require different torques. Tighten the bolts. Often the worker ends up using too much force, greater than the required tightening torque. This not only wastes manpower, but also cannot guarantee the consistency of the torque, and the bolts with relatively small tightening torque are easy to loosen, and there is a potential safety hazard.

Contents of the invention

In order to overcome the deficiencies of the above technologies, the present invention provides a constant torque device for an air wrench. The working torque of the constant torque device used for the pneumatic wrench can be conveniently adjusted according to the specifications of the screw and nut to be tightened and the torque required by the tightened part.

The technical solution adopted by the present invention to overcome its technical problems is: a constant torque device for a pneumatic wrench used in the electric power industry, which includes a cylindrical cylinder with one end closed and one end open, a central shaft, and a set screw. The support body at the open end of the cylinder, the inner spring piece installed in the cylinder close to the closed end, and the outer spring piece installed in the cylinder close to the support body, the outside of the closed end of the cylinder is provided with a square hole with the same size as the square hole of the wrench socket. Shaft, the inner hole wall of the cylinder is provided with several ratchet grooves along the circumferential direction, the central axis is composed of a square hole shaft connected with the wind trigger and a spline shaft, the spline shaft is installed in the cylinder and one end is rotatably supported by the support body and the other One end is rotatably connected to the shaft hole at the closed end of the cylinder. The inner spring and the outer spring are both rectangular pieces with chamfered ends. The chamfered end is located in the ratchet groove of the inner hole of the cylinder, and the other end is installed on the spline shaft. On the keyway; the torque of the inner spring sheet is greater than that of the outer spring sheet; a plane of the square shaft is provided with a tapered blind hole radially, and a circlip and a snap ball are installed in the tapered blind hole; and the large circle of the tapered blind hole The diameter is larger than the diameter of the clamp ball, and the diameter of the small circle is smaller than the diameter of the clamp ball. Under the action of the clip spring, the clip ball only exposes a ball gap relative to the square shaft; when the wrench socket is installed, the clip ball will press the clip spring to realize the wrench. The square hole of the barrel is installed on the square shaft. After installation, the clamp ball will be pushed out under the action of the retaining spring to block the wrench socket.

The beneficial effects of the present invention are: the fixed torque device for the pneumatic wrench of the present invention is simple in structure and low in cost, and can be installed on the common pneumatic wrench for use, so that the common pneumatic wrench has the function of constant torque and has the equivalent pulse pneumatic wrench effect. The cost is greatly saved by adding the fixed torque device originally used for the pneumatic wrench to the original pneumatic wrench for transformation. When bolting, according to the specified torque, adjust the size and quantity of the inner spring piece and the outer spring piece to set it to the required torque, which is convenient and simple to adjust. When the torque of the tightened screw and nut reaches the required torque, the cylinder is subjected to an equal reaction torque. At this time, the spring piece enters the stage of elastic deformation. Due to the elastic deformation, the spring piece will slip out of the ratchet groove in the cylinder. , the spring leaf rotates relative to the barrel, so that the barrel stops and the tightened screws and nuts are no longer stressed. Because the elastically deformed spring leaf will hit the ratchet part of the cylinder when it rotates relative to the cylinder and make a sound to remind the operator that the torque of the bolt and nut tightened at this time has reached the specified torque, and the operation should be stopped.

Description of drawings

Fig. 1 is the device connection schematic diagram of the present invention;

Fig. 2 is the schematic diagram of the constant torque device for pneumatic wrench of the present invention;

3 is a schematic cross-sectional view of the constant torque device for the pneumatic wrench along the central axis of the present invention;

Fig. 4 is the A-A schematic sectional view of the constant torque device for the pneumatic wrench of the present invention;

Fig. 5 is the B-B direction sectional schematic diagram of the constant torque device for pneumatic wrench of the present invention;

Fig. 6 is a structural schematic diagram of the inner spring sheet of the present invention;

Fig. 7 is a structural schematic diagram of the adjusting spring leaf of the present invention;

Fig. 8 is a schematic structural view of the outer spring sheet of the present invention;

In the figure, 1. Wind trigger 2. Fixed torque device 2.1 Central shaft 2.2 Set screw 2.3 Support body 2.4 Cylinder 2.5 Circlip 2.6 Clamp ball 2.7 Inner spring 2.8 Adjusting spring 2.9 Outer spring 2.10 Square shaft 2.11 Tapered blind Hole 3. Wrench socket.

detailed description

Below in conjunction with accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, accompanying drawing 5, accompanying drawing 6, accompanying drawing 7, accompanying drawing 8 the present invention will be further described.

As shown in Fig. 1 , the device connection schematic diagram of the present invention, the fixed torque device 2 for the pneumatic wrench is installed on the common wind trigger 1, and the sleeve 3 is installed on the torque ring. Like this just can make common wind trigger have the effect of constant torque.

As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the constant torque device 2 used for the pneumatic wrench includes a cylindrical barrel 2.4 with one end closed and one end open, the central shaft 2.1, which is installed on the The support body 2.3 at the open end of the cylinder body 2.4, the inner spring piece 2.7 installed in the cylinder body 2.4 close to the closed end, the outer spring piece 2.9 installed in the cylinder body 2.4 close to the support body 2.3, the outside of the closed end of the cylinder body 2.4 is provided with a The wrench sleeve 3 has a square shaft 2.10 with the same square hole size, and the inner hole wall of the cylinder body 2.4 is provided with several ratchet grooves along the circumferential direction. The central shaft 2.1 is composed of a square hole shaft and a spline shaft connected with the wind trigger 1. The spline The shaft is installed in the cylinder body 2.4 and one end is rotatably supported by the support body 2.3 and the other end is rotatably connected to the shaft hole at the closed end of the cylinder body 2.4.

Fig. 6 and Fig. 8 are schematic diagrams of the inner spring sheet 2.7 and the outer spring sheet 2.9 respectively, the inner spring sheet 2.7 and the outer spring sheet 2.9 are rectangular sheet-shaped bodies with chamfered ends, and the chamfered ends are located in the inner hole of the cylinder body 2.4 The other end is installed in the keyway of the spline shaft. During use, the quantity of the outer spring sheet 2.9 and the inner spring sheet 2.7 is selected according to the size of the required torque, so that it is set to a standard torque. Since the length of the inner spring sheet 2.7 is greater than that of the outer spring sheet 2.9, the inner spring sheet 2.7 is a spring sheet that can provide a larger torque, and the outer spring sheet 2.9 is a spring sheet that provides a smaller torque. Therefore, the specification and quantity of the spring leaf can be conveniently combined according to the required torque. When starting to work, the wind trigger 1 drives the central shaft 2.1 to rotate. Since the spring leaf is installed on the central shaft 2.1 and the chamfered end of the spring leaf is located in the ratchet groove of the inner hole of the cylinder 2.4, the rotation of the central shaft 2.1 will drive the torque ring to rotate, and the torque The ring drives the wrench socket 3 to rotate, and the wrench socket 3 rotates with bolts or nuts.

When the tightening torque of the bolts and nuts reaches the specified torque, the wrench socket 3 is subjected to an equal reaction torque. At this time, the force on the spring plate reaches the critical value of its elastic deformation. Due to the elastic deformation, the spring plate will move from the ratchet groove The central shaft 2.1 drives the spring piece to rotate relative to the cylinder 2.4. During the rotation, the spring piece is continuously disjointed from the ratchet groove to make a rattling sound of the cylinder 2.4. When the operator hears the noise, he immediately stops working. At this point, the torque of the bolt reaches the specified torque.

A T-shaped adjustment spring 2.8 with a chamfered end is arranged between the inner spring 2.7 and the outer spring 2.9. One end of the adjustment spring 2.8 is installed on the keyway of the spline shaft, and the other end is located in the inner hole of the barrel 2.4. in the slot. Because the adjusting spring leaf 2.8 is T-shaped, the part width installed on the keyway of the spline shaft is wide, while the width in the ratchet groove in the inner hole of the cylindrical body 2.4 is narrow. Therefore, adjusting the spring leaf 2.8 is also a spring leaf that provides a smaller torque. Therefore, when the constant torque device 2 for the pneumatic wrench of the present invention only needs a small torque, less inner spring pieces 2.7 need to be installed in the cylinder, so in order to prevent the inner spring pieces 2.7 from toppling when there are too few phenomenon, so the introduction of the adjustment spring 2.8 mainly plays the role of filling the gap position.

A plane of the above-mentioned square shaft 2.10 is provided with a tapered blind hole along the radial direction, and a circlip 2.5 and a snap bead 2.6 are installed in the tapered blind hole. And the diameter of the large circle of the tapered blind hole is greater than the diameter of the clamping bead 2.6 and the diameter of the small circle is smaller than the diameter of the clamping bead 2.6, so the clamping bead 2.6 only exposes a spherical gap relative to the square shaft under the action of the clamping spring 2.5. When the wrench sleeve 3 is installed, the clamp ball 2.6 will press down the clamp spring 2.5 to realize the installation of the square hole of the wrench sleeve 3 on the square shaft. After installation, the clamp ball 2.6 will be ejected under the action of the clamp spring 2.5 to lock the wrench The role of sleeve 3. Make the wrench socket 3 firm and reliable in use, and not easy to fall off.

Claims (1)

1. the pneumatic impact spanner for power industry determine torque force device, it is characterised in that: include that one end open is closed in one end The cylinder (2.4) in cylinder barrel shaped, central shaft (2.1), be installed on the support of cylinder (2.4) opening by holding screw Body (2.3), be installed in cylinder (2.4) the inner spring sheet (2.7) near blind end, be installed in cylinder (2.4) near The outer spring sheet (2.9) of support body (2.3), is provided with outside described cylinder (2.4) blind end and wrench socket (3) square hole chi Very little identical square shaft (2.10), the inner hole wall of cylinder (2.4) is peripherally disposed several spine grooves, central shaft (2.1) Being made up of square hole shaft and the splined shaft being connected with pneumtic impact wrench (1), splined shaft is installed in cylinder (2.4) and one end is by supporting Body (2.3) rotatably supports the other end and is rotationally connected with in cylinder (2.4) blind end axis hole, inner spring sheet (2.7) and outward Spring leaf (2.9) is the rectangular patch body with chamfered end, and chamfered end is positioned in cylinder (2.4) endoporus spine groove, the other end It is installed on splined shaft keyway；The moment of torsion of inner spring sheet is more than the moment of torsion of outer spring sheet；One plane of square shaft has been disposed radially one Tapered blind hole, is provided with jump ring and card bead in tapered blind hole；And the axis of great circle of tapered blind hole is more than the diameter of card bead, roundlet is straight Footpath is less than the diameter of card bead, and card bead only exposes a segment under the effect of jump ring relative to square shaft；At assembly wrench sleeve (3) time, card bead can be depressed jump ring and realizes the square hole of wrench socket and be installed on square shaft, and installing rear card bead can be in the effect of jump ring Under eject realization and block wrench socket.