Pneumatic wrench blade mounting structure

Abstract

The utility model provides a pneumatic wrench blade mounting structure, and belongs to the field of pneumatic tools. The problem that an existing structure is poor in stability is solved. The pneumatic wrench comprises a cylinder barrel and a rotor shaft eccentrically arranged in the cylinder barrel, the two ends of the rotor shaft extend out of the cylinder barrel, the installation structure comprises a circle of strip-shaped grooves axially formed in the middle of the rotor shaft in a penetrating mode, the shape and the size of the strip-shaped grooves are matched with those of the blades, and the blades are inserted into the strip-shaped grooves respectively. A positioning hole is formed in the bottom wall of each strip-shaped groove in the radial direction, a spring enabling the outer end of the corresponding blade to tend to stretch out of the corresponding strip-shaped groove is arranged in each positioning hole, and the spring can completely retract into the corresponding positioning hole when the outer end face of the corresponding blade makes contact with the inner side face of the cylinder barrel. The working stability of the pneumatic wrench can be enhanced.

Description

Technical Field

[0001] The utility model belongs to the field of pneumatic tools and relates to a pneumatic wrench, in particular to a pneumatic wrench blade installation structure. Background Art

[0002] A pneumatic wrench is also called a ratchet wrench or a combination electric tool. It uses a continuous power source (such as compressed air) to accelerate the rotation of an object with a certain mass, and then instantly hits the output shaft, thereby obtaining a relatively large torque output.

[0003] The pneumatic motor is an important component of the pneumatic wrench. Its structure is as disclosed in the Chinese Patent Library as the pneumatic motor mechanism for preventing the motor from getting stuck (application number: 200520118819.4), which consists of a front end plate, a rear end plate, a rotor and an eccentric cylinder; the front end plate is tightly fitted with a front bearing; the rear end plate is tightly fitted with a rear bearing; there are multiple blade grooves on the rotor, each blade groove is respectively provided with a blade, and the rotor is arranged in the eccentric cylinder; the front end plate is fixedly connected to the front end of the eccentric cylinder through the front cylinder pin, and the rear end plate is fixedly connected to the rear end of the eccentric cylinder through the rear cylinder pin; the front end of the rotor is in close contact with the front bearing; a rotor bushing is arranged on the periphery of the rear end of the rotor, and then in close contact with the rear bearing, and a screw hole is arranged at the rear end of the rotor, and a semicircular head screw is screwed to the screw hole through a wire disc spring.

[0004] When the above-mentioned pneumatic motor is in use, due to the presence of impurities or fine particles in the air source, when the impurities adhere to the blades, the fit between the blades and the cylinder wall will be affected, which may easily cause air leakage and affect the operation of the pneumatic wrench. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a pneumatic wrench blade installation structure, which solves the technical problem of how to improve working stability.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a pneumatic wrench blade mounting structure, the pneumatic wrench includes a cylinder and a rotor shaft eccentrically arranged in the cylinder, and both ends of the rotor shaft extend out of the cylinder, the mounting structure includes a circle of strip grooves axially penetrating through the middle of the rotor shaft, the shape and size of the strip grooves match the blades, and a blade is inserted in each strip groove, characterized in that a positioning hole is radially opened on the bottom wall of each strip groove, and a spring is provided in each positioning hole to make the outer end of the corresponding blade have a tendency to extend out of the corresponding strip groove, and the spring can be completely retracted into the corresponding positioning hole when the outer end surface of the corresponding blade contacts the inner side surface of the cylinder.

[0007] A spring is provided to provide an additional force to push the blade outward, thereby effectively increasing the contact strength between the outer end face of the blade and the inner side face of the cylinder. This not only strengthens the sealing performance formed between the blade and the cylinder, but also prevents fine particles such as dust from hindering the contact between the blade and the cylinder, thereby effectively avoiding air leakage and ensuring stable operation of the wrench.

[0008] In the above-mentioned pneumatic wrench blade mounting structure, the bottom wall of the above-mentioned strip groove is an arc surface, and the depth of the strip groove gradually increases from the end to the middle, and the inner end surface of the blade is an arc shape matching the arc surface, so as to increase the contact area between the bottom wall of the strip groove and the blade, so that the blade obtains stronger support to make more powerful contact with the inner wall of the cylinder, further ensuring the stable operation of the wrench.

[0009] In the above-mentioned pneumatic wrench blade installation structure, both ends of the bottom wall of each strip groove are provided with the above-mentioned positioning holes, and the number of positioning holes and springs is the same and the positions correspond one to one, so that by increasing the number of springs, the blade and the cylinder can be more effectively contacted.

[0010] In the above-mentioned pneumatic wrench blade installation structure, two springs in the same strip groove are arranged in parallel along the axial direction of the rotor shaft, so that the blades can obtain stronger support.

[0011] In the above-mentioned pneumatic wrench blade installation structure, the two ends of the spring act on the inner end surface of the corresponding blade and the bottom surface of the corresponding positioning hole respectively, which has the advantages of stable operation and convenient installation.

[0012] In the above-mentioned pneumatic wrench blade mounting structure, multiple positioning holes are divided into two rows of hole units distributed axially along the rotor shaft, and each row of hole units includes multiple positioning holes evenly distributed circumferentially along the rotor shaft; in the same row of hole units, two adjacent positioning holes are connected so that the strip grooves are interconnected, thereby accelerating the heat dissipation of the spring and the blade, and improving the life and working stability of the pneumatic wrench.

[0013] Compared with the prior art, the pneumatic wrench blade installation structure has the following advantages:

[0014] 1. A spring is set to provide an additional force to push the blade outward, effectively increasing the contact strength between the outer end surface of the blade and the inner side of the cylinder. This not only strengthens the sealing performance formed between the blade and the cylinder, but also prevents fine particles such as dust from hindering the contact between the blade and the cylinder, thereby effectively avoiding air leakage and ensuring stable operation of the wrench.

[0015] 2. In the same row of hole units, two adjacent positioning holes are connected so that the strip grooves are interconnected, thereby accelerating the heat dissipation of the spring and blades and improving the life and working stability of the pneumatic wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a three-dimensional schematic diagram of the pneumatic wrench blade installation structure.

[0017] Figure 2 It is the state diagram of the blade when it is running.

[0018] Figure 3 It is a three-dimensional schematic diagram of the rotor shaft.

[0019] Figure 4 It is a schematic cross-sectional view of the rotor shaft.

[0020] In the figure, 1, cylinder; 2, rotor shaft; 2a, strip groove; 2a1, arc surface; 2b, positioning hole; 3, blade; 4, spring. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 2 As shown, the pneumatic wrench includes a cylinder 1 and a rotor shaft 2 eccentrically arranged in the cylinder 1 , the axes of the rotor shaft 2 and the cylinder 1 are arranged in parallel, and both ends of the rotor shaft 2 extend out of the cylinder 1 .

[0023] The pneumatic wrench blade installation structure includes a circle of strip grooves 2a axially penetrating the middle of the rotor shaft 2, the shape and size of the strip grooves 2a match the blades 3, and each strip groove 2a is inserted with a blade 3. Figures 1 to 3 As shown, a positioning hole 2b is radially opened on the bottom wall of each strip groove 2a, and a spring 4 is provided in each positioning hole 2b so that the outer end of the corresponding blade 3 has a tendency to extend out of the corresponding strip groove 2a, and the spring 4 can be completely retracted into the corresponding positioning hole 2b when the outer end surface of the corresponding blade 3 contacts the inner side surface of the cylinder 1.

[0024] A spring 4 is provided to provide an additional force to push the blade 3 outward, thereby effectively increasing the contact strength between the outer end surface of the blade 3 and the inner surface of the cylinder 1. This not only strengthens the sealing performance formed between the blade 3 and the cylinder 1, but also prevents fine particles such as dust from hindering the contact between the blade 3 and the cylinder 1, thereby effectively avoiding air leakage and ensuring stable operation of the wrench.

[0025] The specific installation method of the spring 4 is as follows: the axis of the spring 4 extends axially along the positioning hole 2b, and the two ends of the spring 4 act on the inner end surface of the corresponding blade 3 and the bottom surface of the corresponding positioning hole 2b respectively, which has the advantages of stable operation and easy installation.

[0026] In this embodiment,

[0027] like Figure 4As shown, the bottom wall of the strip groove 2a is an arc surface 2a1, and the depth of the strip groove 2a gradually increases from the end to the middle, and the inner end surface of the blade 3 is an arc shape matching the arc surface 2a1, so as to increase the contact area between the bottom wall of the strip groove 2a and the blade 3, so that the blade 3 can obtain stronger support and make more powerful contact with the inner wall of the cylinder 1, further ensuring the stable operation of the wrench.

[0028] Preferably, both ends of the bottom wall of each strip groove 2a are provided with the above-mentioned positioning holes 2b, and the number of positioning holes 2b and springs 4 are the same and the positions correspond to each other, so that the blade 3 can be more effectively contacted with the cylinder by increasing the number of springs 4. Further explanation: two springs 4 in the same strip groove 2a are arranged side by side along the axial direction of the rotor shaft 2, so that the blade 3 can obtain more powerful support.

[0029] like Figure 3 and Figure 4 As shown, the multiple positioning holes 2b are divided into two rows of hole units distributed axially along the rotor shaft 2, and each row of hole units includes multiple positioning holes 2b uniformly distributed circumferentially along the rotor shaft 2; in the same row of hole units, two adjacent positioning holes 2b are connected to make the strip grooves 2a interconnected, thereby accelerating the heat dissipation of the spring 4 and the blade 3, and improving the life and working stability of the pneumatic wrench.

[0030] In actual products, the number of the strip grooves 2a and the number of the blades 3 are both 6.

[0031] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pneumatic wrench blade mounting structure, the pneumatic wrench comprising a cylinder (1) and a rotor shaft (2) eccentrically arranged in the cylinder (1), with both ends of the rotor shaft (2) extending out of the cylinder (1), the mounting structure comprising a circle of strip grooves (2a) axially penetrating through the middle of the rotor shaft (2), the shape and size of the strip grooves (2a) matching the blades (3), and each strip groove (2a) having a blade (3) inserted therein, characterized in that: A positioning hole (2b) is radially formed on the bottom wall of each strip groove (2a), and a spring (4) is provided in each positioning hole (2b) so that the outer end of the corresponding blade (3) has a tendency to extend out of the corresponding strip groove (2a), and the spring (4) can be completely retracted into the corresponding positioning hole (2b) when the outer end surface of the corresponding blade (3) contacts the inner side surface of the cylinder (1).

2. The pneumatic wrench blade mounting structure according to claim 1, characterized in that: The bottom wall of the strip groove (2a) is a circular arc surface (2a1), and the depth of the strip groove (2a) gradually increases from the end to the middle, and the inner end surface of the blade (3) is in an arc shape matching the circular arc surface (2a1).

3. The pneumatic wrench blade mounting structure according to claim 1 or 2, characterized in that: The above-mentioned positioning holes (2b) are provided at both ends of the bottom wall of each strip-shaped groove (2a), and the number of the positioning holes (2b) and the number of the springs (4) are the same and their positions correspond one to one.

4. The pneumatic wrench blade mounting structure according to claim 3, characterized in that: Two springs (4) located in the same strip groove (2a) are arranged in parallel along the axial direction of the rotor shaft (2).

5. The pneumatic wrench blade mounting structure according to claim 1 or 2, characterized in that: Two ends of the spring (4) act on the inner end surface of the corresponding blade (3) and the bottom surface of the corresponding positioning hole (2b) respectively.

6. The pneumatic wrench blade mounting structure according to claim 3, characterized in that: The plurality of positioning holes (2b) are divided into two rows of hole units distributed along the axial direction of the rotor shaft (2), and each row of hole units comprises a plurality of positioning holes (2b) evenly distributed along the circumferential direction of the rotor shaft (2); in the same row of hole units, two adjacent positioning holes (2b) are connected.

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