Pneumatic wrench

Abstract

The utility model discloses a pneumatic wrench, and relates to the technical field of pneumatic tools, in order to solve the problem that the pneumatic wrench is poor in sealing performance, the pneumatic wrench comprises a shell provided with a power assembly and a striking assembly, a rear shell of the shell and a handle are integrated into an integrated structure, and compared with a tool with the same torque output, the pneumatic wrench is lighter in weight, more stable in torque output and more reliable in sealing performance. The handle is provided with an independent air inlet channel used for installing the air inlet assembly and a trigger assembly used for controlling the air inlet assembly, compressed air connected in from the air inlet assembly in a unified mode is pumped through by pressing the trigger assembly, the rear shell is provided with an aluminum cover plate and a rotary knob assembly, and the operation state of the power assembly is adjusted through the rotary knob assembly. An air inlet bag sleeve used for communicating the aluminum cover plate with the air inlet channel is arranged in the handle, compressed air passing through the air inlet channel directly enters the aluminum cover plate from the air inlet bag sleeve so as to drive the power assembly to operate, and the air inlet bag sleeve is arranged so that the overall structure of the pneumatic wrench can be stabilized, and an air path can be simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic tools, and more specifically, to a pneumatic wrench. Background Art

[0002] Pneumatic transmission is the evolution and development of pneumatic technology and hydraulic technology. Pneumatic transmission uses compressed air as the working medium to transmit motion and power. Since the power transmission medium of pneumatic transmission is inexhaustible air, it has little pollution, so it has broad development prospects in the field of automation. Pneumatic transmission is widely used in textile, machinery, automobile, electronics, military, steel, chemical, food, packaging and other industries. With the development of atomic energy, space technology, computer technology, etc., pneumatic transmission technology will be more widely used in various industrial fields.

[0003] Pneumatic wrenches are based on the principle of pneumatic transmission and are widely used in many industries, such as auto repair, heavy equipment maintenance, product assembly, major construction projects, installation of wire screw inserts, and anywhere else where high torque output is needed. Pneumatic wrenches mainly convert compressed gas into rotational kinetic energy and output torque by striking the structure. However, the existing gas circuit for conveying compressed gas is in a passage state with the handle plug, and the handle is provided with a threaded port for installing the handle plug. When the pneumatic wrench is in long-term operation and use, the handle plug will become loose due to vibration, and the other end of the gas circuit is directly connected to the end cover, which is easy to "leak edge", there is a risk of air leakage, and the sealing is poor.

[0004] Therefore, how to solve the problem of poor sealing of existing pneumatic wrenches is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a pneumatic wrench with good sealing performance and no air leakage, so as to ensure the stability of the air path and structure.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A pneumatic wrench comprises a shell provided with a power component and a striking component, the rear shell of the shell is integrated with a handle into an integral structure, the handle is provided with an independent air intake channel for installing the air intake component and a trigger component for controlling the air intake component, the rear shell is provided with an aluminum cover plate and a knob assembly, and the handle is provided with an air intake bag sleeve for connecting the aluminum cover plate and the air intake channel.

[0008] Preferably, the knob assembly includes a detachable gear-shifting knob disposed at the rear end of the rear shell, the gear-shifting knob is rotatably connected to the rear shell, and the front end of the gear-shifting knob abuts against the end cover.

[0009] Preferably, the knob assembly further includes an outer knob provided on the gear shift knob. The outer knob is fixed to the gear shift knob by screws, and spring washers are provided on the screws.

[0010] Preferably, the gear shift knob is provided with grooves extending along its axial direction. There are at least two grooves, and the at least two grooves are evenly arranged in the circumferential direction of the gear shift knob. A positioning assembly is provided in the grooves.

[0011] Preferably, the positioning assembly includes a spring and a detent ball. The spring abuts against the groove, and the detent ball is provided at the end of the spring and abuts against the aluminum cover plate.

[0012] Preferably, the front end of the aluminum cover plate abuts against the end cover. At least two clamping grooves are provided on the end face of the aluminum cover plate where it abuts against the detent ball, and the at least two clamping grooves are arranged in one-to-one correspondence with the detent balls.

[0013] Preferably, the front end of the end cover abuts against the power assembly. The end cover is provided with an installation groove for radially positioning the power assembly, so that one end of the power assembly is located in the installation groove. The output end of the power assembly is connected to the striking assembly by a spline. The striking assembly extends out of the front end of the front shell along the axial direction of the pneumatic wrench. A bushing connected to the front shell is provided on the circumference of the striking assembly, so that the striking assembly is rotatably connected to the front shell.

[0014] Preferably, an annular groove is provided on the outer circumference of the gear shift knob, and an O-ring for sealing between the gear shift knob and the aluminum cover plate is installed in the annular groove.

[0015] Preferably, the aluminum cover plate and the air intake sleeve are of an integral structure.

[0016] Preferably, the air intake sleeve is of a metal structure, and the handle is of a plastic structure.

[0017] The pneumatic wrench provided by the present utility model includes a housing provided with a power assembly and a striking assembly. The power assembly provides output power for the striking assembly. The rear shell of the housing is integrated with the handle into an integral structure, so that the overall tool assembly is streamlined, the assembly accuracy is improved. Compared with tools with the same torque output, the weight is lighter, the torque output is more stable. The handle is provided with an independent air intake channel for installing the air intake assembly and a trigger assembly for controlling the air intake assembly. By pressing the trigger assembly, the compressed air uniformly introduced from the air intake assembly is opened, so that the air intake channel can smoothly pass the compressed air. The rear shell is provided with an aluminum cover plate and a knob assembly. The operating state of the power assembly is adjusted through the knob assembly to adjust the magnitude of the power output by the power assembly. An air intake sleeve for communicating the aluminum cover plate with the air intake channel is provided in the handle. The compressed air passing through the air intake channel directly enters the aluminum cover plate from the air intake sleeve to drive the operation of the power assembly. By providing the air intake sleeve, the overall structure of the pneumatic wrench is stabilized and the air circuit is simplified.

[0018] The pneumatic wrench arranged in the above manner has a unique air circuit structure, good sealing performance, no air leakage, stable structure, and high load-bearing strength. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0020] Figure 1 Structural schematic diagram of the pneumatic wrench provided by the present invention;

[0021] Figure 2 Explosion diagram of the pneumatic wrench provided by the present invention;

[0022] Figure 3 Structural schematic diagram of the gear shifting knob provided by the present invention;

[0023] Figure 4 Partial explosion diagram of the pneumatic wrench provided by the present invention;

[0024] Figure 5 Partial schematic diagram of the pneumatic wrench provided by the present invention.

[0025] Reference Signs:

[0026] 1 - Power assembly;

[0027] 2 - Impact assembly;

[0028] 3 - Handle;

[0029] 4 - Air intake assembly;

[0030] 5 - Air intake passage;

[0031] 6 - Trigger assembly;

[0032] 7 - Aluminum cover plate;

[0033] 8 - Knob assembly, 81 - Gear shifting knob, 811 - Groove, 82 - Outer knob, 83 - Screw, 84 - Spring washer;

[0034] 9 - Air intake bladder sleeve;

[0035] 10 - End cap;

[0036] 11 - Positioning assembly, 110 - Spring, 111 - Ball. Detailed Description of the Invention

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0038] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] The core of the present utility model is to provide a pneumatic wrench with good sealing performance and no air leakage to ensure the stability of the air circuit and structure.

[0040] Please refer to Figure 1 、 Figure 2 and Figure 3 , a pneumatic wrench. Specifically, it includes a housing provided with a power component 1 and a striking component 2. The power component 1 provides output power for the striking component 2. The rear shell of the housing is integrated with the handle 3 to make the overall tool assembly concise, improve the assembly accuracy, and make the weight more lightweight and the torque output more stable compared with tools with the same torque output. The handle 3 is provided with an independent air inlet channel 5 for installing an air inlet component 4 and a trigger component 6 for controlling the air inlet component 4. By pressing the trigger component 6, the compressed air uniformly introduced from the air inlet component 4 is opened, so that the air inlet channel 5 can smoothly pass through the compressed air. The rear shell is provided with an aluminum cover plate 7 and a knob component 8. The operating state of the power component 1 is adjusted through the knob component 8 to adjust the magnitude of the output power of the power component 1. An air inlet bladder sleeve 9 for connecting the aluminum cover plate 7 and the air inlet channel 5 is arranged inside the handle 3. The compressed air passing through the air inlet channel 5 directly enters the aluminum cover plate 7 from the air inlet bladder sleeve 9 to drive the operation of the power component 1. By setting the air inlet bladder sleeve 9, the overall structure of the pneumatic wrench is stabilized and the air circuit is simplified.

[0041] In this embodiment, the aluminum cover plate 7 is arranged on the inner circumference of the rear shell for sealing. The rear shell is injection-molded on the outer circumference of the aluminum cover plate 7. The aluminum cover plate 7 is inlaid into the handle 3 when the handle 3 is produced by using the production process, which ensures the sealing performance of the product and improves the product accuracy and quality while reducing the processes. The aluminum cover plate 7 has a certain hardness and can provide support for the rear shell. A through hole for installing the knob component 8 is arranged at the center of the aluminum cover plate 7.

[0042] Among them, in this embodiment, the aluminum cover plate 7 is made of aluminum material. However, in actual life, there is no limitation on this, as long as the above technical effects can be achieved.

[0043] The pneumatic wrench set in the above manner has a unique air circuit structure, good sealing performance, no air leakage, stable structure, and high load-bearing strength.

[0044] In the above embodiment, the knob assembly 8 includes a shift knob 81 that is disposed at the rear end of the rear housing and is detachable. The shift knob 81 is rotatably connected to the rear housing, and the front end of the shift knob 81 abuts against the end cover 10.

[0045] It should be noted that when it is necessary to adjust the magnitude of the power output by the power assembly 1, it can be achieved by rotating the shift knob 81.

[0046] In the above situation, the knob assembly 8 further includes an outer knob 82 disposed on the shift knob 81. The outer knob 82 is fixed to the shift knob 81 by a screw 83, and a spring washer 84 is provided on the screw 83.

[0047] It can be understood that the shift knob 81 is designed with a middle card slot, so that the outer knob 82 is tightened on the shift knob 81, which is convenient for external rotation and improves the convenience of use.

[0048] Please refer to Figure 4 , the shift knob 81 is provided with a groove 811 extending along its axial direction. There are at least two grooves 811, and at least two grooves 811 are evenly disposed in the circumferential direction of the shift knob 81. A positioning assembly 11 is provided in the groove 811.

[0049] It should be noted that by adding the positioning assembly 11 on the shift knob 81, the rotated shift knob 81 is positioned to ensure that the shift knob 81 no longer rotates.

[0050] In this embodiment, there are three grooves 811 to correspond to three groups of positioning assemblies 11. However, in actual life, there is no limitation on this, as long as the above technical effects can be achieved.

[0051] In the above embodiment, the positioning assembly 11 includes a spring 110 and a top bead 111. The spring 110 abuts against the groove 811, and the top bead 111 is disposed at the end of the spring 110 and abuts against the aluminum cover plate 7.

[0052] It can be understood that the top bead 111 and the spring 110 are added at the shift knob 81 to avoid the leakage of compressed air when the tool is working and ensure the output of the power torque. In this embodiment, the positioning assembly 11 is set as the spring 110 and the top bead 111. However, in actual life, there is no limitation on this, as long as the above technical effects can be achieved.

[0053] On the basis of the above embodiments, the front end of the aluminum cover plate 7 abuts against the end cover 10. At least two clamping grooves are provided on the end surface of the aluminum cover plate 7 that abuts against the top beads 111, and the at least two clamping grooves are arranged in one-to-one correspondence with the top beads 111.

[0054] It should be noted that the front end of the aluminum cover plate 7 is arranged on the outer periphery of the end cover 10 to realize the radial positioning of the end cover 10. Through the aluminum cover plate 7 and the power assembly 1, the axial positioning of the end cover 10 is realized. Moreover, a gap is left between the shift knob 81 and the aluminum cover plate 7 to enable the shift knob 81 to rotate smoothly. Clamping grooves are provided on the end surface of the aluminum cover plate 7 that abuts against the top beads 111. When the shift knob 81 rotates from one gear to the next gear, the three top beads 111 rotate synchronously along the front end surface of the aluminum cover plate 7. At this time, the top beads 111 have a compressive force on the spring 110, causing the spring 110 to have compressive elastic force. When the shift knob 81 rotates to the next gear, one end of the top bead 111 is caught in the clamping groove under the action of the restoring force of the spring 110 to fix the position of the shift knob 81 and prevent the shift knob 81 from continuing to rotate.

[0055] Among them, in this embodiment, three clamping grooves are provided, but in actual life, there is no limitation on this, as long as the above technical effects can be achieved. Moreover, there are no limitations on the shape, size, etc. of the clamping grooves.

[0056] It can be understood that there are four gears on the shift knob 81. When operating the shift knob 81 for forward and reverse settings, the spring 110 in the shift knob 81 uses its elasticity to push the top bead 111 towards the aluminum cover plate 7, so that the shift knob 81 will be closer to the end cover 10, thereby achieving sealing and preventing air leakage. In actual applications, there is no limitation on the specific distribution method of the four gears, as long as the above technical effects can be achieved.

[0057] In this embodiment, there are four gears on the shift knob 81, including three forward rotation gears and one reverse rotation gear. Correspondingly, four clamping grooves are provided on the end surface of the aluminum cover plate 7 that abuts against the top beads 111. When the shift knob 81 rotates to one of the top beads 111 being caught in one of the clamping grooves, it is one gear. However, in actual life, there are no limitations on the gears on the shift knob 81 and the angle of rotating the shift knob 81 corresponding to each gear, as long as the above technical effects can be achieved.

[0058] Furthermore, the shift knob 81 is designed with multiple springs 110 and top beads 111 to improve the matching accuracy, increase the axial force on the end surface, improve the sealing performance with the end cover 10 and the handle 3, and the balance of the rotation of the aluminum cover plate 7, so as to avoid air leakage when the pneumatic wrench is vibrating and rotating, ensure the assembly accuracy, and improve the output of the power torque.

[0059] In the above embodiment, the front end of the end cover 10 abuts against the power component 1, and the end cover 10 is provided with a mounting groove for radially positioning the power component 1 so that one end of the power component 1 is located in the mounting groove, and the output end of the power component 1 is connected to the striking component 2 through a spline, and the striking component 2 extends out of the front end of the front shell along the axial direction of the pneumatic wrench, and the striking component 2 is circumferentially provided with a shaft sleeve connected to the front shell so that the striking component 2 is rotatably connected to the front shell.

[0060] It can be understood that the output power of the power component 1 can be changed by switching the gear position through the gear adjustment knob 81 to achieve output forces of different frequencies. The striking component 2 converts the output power of the power component 1 into its own rotation to achieve rotational work of different frequencies.

[0061] As a preferred embodiment, an annular groove is provided on the outer periphery of the gear shifting knob 81 , and the annular groove is used to install an O-ring that seals the gear shifting knob 81 and the aluminum cover plate 7 .

[0062] It should be noted that a sealing structure is designed at the gear shift knob 81 to increase the sealing performance and prevent air leakage. In this embodiment, the outer periphery of the gear shift knob 81 is provided with two annular grooves, which are respectively provided at the front end and the rear end of the gear shift knob 81, and the groove 811 on the gear shift knob 81 is located between the two annular grooves, but in real life, there is no limitation on this.

[0063] Please refer to Figure 5 The aluminum cover plate 7 and the air bag cover 9 are an integrated structure.

[0064] It can be understood that the aluminum cover plate 7 and the air bag cover 9 are formed in one step, which simplifies the overall structure, stabilizes the overall structure, and improves the overall precision.

[0065] In the above embodiment, the air inlet bag cover 9 is a metal structure, and the handle 3 is a plastic structure.

[0066] It should be noted that, because the rear shell and the handle 3 are designed as an integrated whole, the weight is lighter and the torque output is more stable compared with tools with the same torque output. The air ducts are directly integrated from two to one without the "diversion" phenomenon, and are directly connected, so that the air is larger and the handle 3 is more powerful. A spring 110 and a top bead 111 are designed on the shift knob 81 to support the end cover 10 when the shift knob 81 shifts gears to prevent air leakage, thereby playing a sealing role and ensuring the output of power torque. The intake air duct is shorter, which reduces the air pressure loss and is more precise than the traditional handle 3 air path.

[0067] The existing structure is provided with a handle plug, which is in a through state with the air inlet passage 5. The handle plug is in threaded fit with the air inlet passage 5. After long-term operation and vibration, the handle plug will become loose, easily "leak at the edge", have the risk of air leakage, poor sealing performance, and insufficient bearing strength. In this application, the air inlet passage 5 is directly and hermetically separated from the position where the handle plug is provided, so that the handle plug is not connected to the air inlet passage 5. An air bag sleeve 9 is embedded inside the air inlet passage 5 to improve the bearing strength. At the same time, the aluminum cover plate 7 and the air bag sleeve 9 are integrally formed to increase the sealing performance at the connection between the aluminum cover plate 7 and the air bag sleeve 9, prevent air leakage, and ensure the stability of the air path and the structure.

[0068] In summary, the pneumatic wrench provided by the present utility model mainly converts compressed gas into rotational kinetic energy, outputs work and torque through the striking assembly 2, and opens the compressed air uniformly introduced from the air inlet assembly 4 by pressing the trigger assembly 6, so that the compressed gas passes through the air inlet passage 5, passes through a unique internal nested air path, namely the air inlet insert, the aluminum cover plate 7, the gear shift knob 81 and the end cover 10, is shunted and then enters the power assembly 1, acts on the blades to drive the leaf shaft to rotate, and then drives the striking assembly 2 to output work and torque for tightening and removing threaded fasteners.

[0069] The pneumatic wrench has a novel appearance, light weight, a compact overall height-engineered design, is easy to repair and replace, has a stable rotation speed, is equipped with an external knob 82, has strong applicability, a wide application range, convenient gear shifting, a long service life, no air leakage, high engine energy efficiency, and generates a large torque.

[0070] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0071] The above has introduced in detail a pneumatic wrench provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A pneumatic wrench, characterized in that: The invention comprises a housing provided with a power assembly (1) and a striking assembly (2), wherein the rear shell of the housing is integrated with a handle (3) into an integral structure, the handle (3) is provided with an independent air intake passage (5) for installing an air intake assembly (4) and a trigger assembly (6) for controlling the air intake assembly (4), the rear shell is provided with an aluminum cover plate (7) and a knob assembly (8), and the handle (3) is provided with an air intake bag sleeve (9) for connecting the aluminum cover plate (7) with the air intake passage (5).

2. The pneumatic wrench according to claim 1, characterized in that: The knob assembly (8) comprises a detachable gear shift knob (81) disposed at the rear end of the rear shell, the gear shift knob (81) being rotatably connected to the rear shell, and the front end of the gear shift knob (81) being in contact with the end cover (10).

3. The pneumatic wrench according to claim 2, characterized in that: The knob assembly (8) further comprises an outer knob (82) disposed on the gear-shift knob (81); the outer knob (82) is fixed to the gear-shift knob (81) via a screw (83); a spring washer (84) is disposed on the screw (83).

4. The pneumatic wrench according to claim 3, characterized in that: The gear shift knob (81) is provided with a groove (811) extending along its axial direction, at least two grooves (811) are provided, and at least two grooves (811) are evenly arranged in the circumference of the gear shift knob (81), and a positioning assembly (11) is provided in the groove (811).

5. The pneumatic wrench according to claim 4, characterized in that: The positioning assembly (11) comprises a spring (110) and a top ball (111), the spring (110) abuts against the groove (811), and the top ball (111) is arranged at the end of the spring (110) and abuts against the aluminum cover plate (7).

6. The pneumatic wrench according to claim 5, characterized in that: The front end of the aluminum cover plate (7) abuts against the end cover (10), and the end surface of the aluminum cover plate (7) abutting against the top bead (111) is provided with at least two positioning grooves, and at least two of the positioning grooves are arranged in a one-to-one correspondence with the top bead (111).

7. The pneumatic wrench according to claim 6, characterized in that: The front end of the end cover (10) abuts against the power assembly (1), and the end cover (10) is provided with a mounting groove for radially positioning the power assembly (1), so that one end of the power assembly (1) is located in the mounting groove, and the output end of the power assembly (1) is connected to the striking assembly (2) via a spline, and the striking assembly (2) extends along the axial direction of the pneumatic wrench, and the striking assembly (2) is circumferentially provided with a shaft sleeve connected to the front shell of the housing, so that the striking assembly (2) is rotatably connected to the front shell.

8. The pneumatic wrench according to any one of claims 2 to 4, characterized in that: An annular groove is provided on the outer periphery of the gear shift knob (81), and the annular groove is used to install an O-ring for sealing the gear shift knob (81) and the aluminum cover plate (7).

9. The pneumatic wrench according to claim 8, characterized in that: The aluminum cover plate (7) and the air inlet bag cover (9) are an integrated structure.

10. The pneumatic wrench according to claim 9, characterized in that: The air inlet bag cover (9) is a metal structure, and the handle (3) is a plastic structure.

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