Exhaust structure for pneumatic impact wrench

Abstract

This application discloses an exhaust structure for a pneumatic impact wrench, comprising a grip handle with an air inlet channel and an exhaust channel. The grip handle has an air inlet end and an exhaust end cap at its end, the exhaust end cap being pressed against the end of the grip handle by a screw-on connection between the air inlet end and the end of the grip handle. The exhaust end cap features an exhaust portion inclined relative to the air outlet direction of the end of the grip handle, the exhaust direction of which is inclined relative to the air outlet direction of the end of the grip handle and away from the heel of the hand when gripped. The outer end of the exhaust portion also features a ground support wall inclined relative to the air outlet direction of the exhaust portion. This exhaust structure prevents the ejected gas from directly hitting the heel of the hand, effectively enhances the installation and connection strength of the exhaust end cap, and provides an auxiliary support surface for the stable tilting of the pneumatic impact wrench through the ground support wall.

Description

Technical Field

[0001] This application relates to the field of pneumatic impact wrench technology, and more particularly to an exhaust structure for a pneumatic impact wrench. Background Technology

[0002] A pneumatic impact wrench is a highly efficient mechanical tool for tightening and loosening bolts and nuts, also known as a pneumatic wrench. Pneumatic impact wrenches are used in industries such as petroleum, chemical, railway, bridge, automotive, power, mining, shipbuilding, and construction. Driven by compressed air, it can quickly tighten or loosen bolts and nuts, greatly improving work efficiency.

[0003] In existing pneumatic impact wrenches, the handle end is generally provided with an air inlet channel and an air outlet channel arranged side by side along its length, while the exhaust end cap and the air inlet end cap are installed on the handle end to match their respective channels.

[0004] Among them, the exhaust end caps, due to their structural design deficiencies, such as being mostly constructed as thin plate structures, have the following shortcomings:

[0005] 1. When venting, the vented gas often sprays directly onto the palm, especially the base of the palm, which poses a certain safety hazard.

[0006] 2. The thinner plate structure, after installation, causes the air intake end to form a separate, protruding protrusion. In addition, the protruding part of the air intake end is basically cylindrical. When the pneumatic impact wrench is placed on a wall or other vertical support using the handle end and the head sleeve as the ground support surface, it is difficult to achieve a stable tilted placement.

[0007] Secondly, in existing technologies, exhaust end caps are mostly pressed onto the handle end by the screw-on connection between the intake end and the handle end. However, there is basically no connecting structure on the side of the exhaust end cap that is away from the intake end to maintain a further reliable connection between the exhaust end cap and the handle end. Utility Model Content

[0008] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes an exhaust structure for a pneumatic impact wrench, which guides the gas to be discharged downwards at an angle away from the heel of the hand by designing an exhaust end cap with a unique structure that is inclined relative to the end of the handle, thereby preventing the gas from being sprayed directly towards the heel of the hand; at the same time, this application can also provide an inclined ground support wall on the outer end of the exhaust end cap as a ground support surface to help form a stable inclined placement; secondly, this application can further increase the reliability of the connection with the end of the handle by setting a connection structure on the side of the exhaust end cap away from the air inlet end, which can be detachably snapped to the end of the handle.

[0009] According to the exhaust structure of the pneumatic impact wrench in this embodiment, it has a grip handle, which is constructed with an air inlet channel and an exhaust channel. The grip handle has an air inlet end and an exhaust end cap at its end. The exhaust end cap is pressed onto the end of the grip handle by the screw-on connection between the air inlet end and the end of the grip handle. The exhaust end cap is constructed with an exhaust portion that is inclined relative to the exhaust direction of the end of the grip handle. The exhaust direction of the exhaust portion is inclined relative to the exhaust direction of the end of the grip handle and is away from the palm base when gripping. The outer end of the exhaust portion is also constructed with a ground support wall that is inclined relative to the exhaust direction of the exhaust portion.

[0010] According to the exhaust structure of the pneumatic impact wrench in the embodiments of this application, with the exhaust end cover, the gas can change its exhaust direction after passing through the exhaust end cover, so as to move away from the palm base when gripping, thereby preventing the gas from being sprayed directly onto the palm base and causing safety hazards; at the same time, in conjunction with the setting of the ground support wall, the end of the handle has a ground support surface, and after matching the pneumatic impact wrench head sleeve, the pneumatic impact wrench can be placed in a stable tilted position.

[0011] According to the exhaust structure of the pneumatic impact wrench in the embodiments of this application, the exhaust end cover has a mounting base and the exhaust portion integrally formed on the mounting base. The portion of the mounting base opposite to the exhaust portion is provided with a connecting hole for the air inlet end to be sleeved. The air inlet end has a radially outwardly protruding annular expansion crimping portion at the sleeve, and the edge of the annular expansion crimping portion extends to the edge of the mounting base opposite to the exhaust portion.

[0012] According to the exhaust structure of the pneumatic impact wrench in the embodiments of this application, the end of the grip handle is constructed with a concave receiving groove that communicates with the air intake channel and the exhaust channel, and the root of the mounting base plate of the exhaust end cover is disposed in the concave receiving groove to form a concealed installation.

[0013] According to the exhaust structure of the pneumatic impact wrench in the embodiments of this application, a radially protruding locking block is provided on the side of the exhaust end cover opposite to the air inlet end, and a locking groove is provided on the bottom wall of the concave receiving groove for the locking block to be inserted and locked, and the locking groove continues to extend radially for a certain distance on the side wall of the concave receiving groove.

[0014] According to the exhaust structure of the pneumatic impact wrench in the embodiment of this application, the exhaust end cover is provided with multiple parallel partition plates inside the exhaust part. The partition plates extend from the inner end wall of the exhaust part to the outer end wall along the exhaust direction of the exhaust part. When the pneumatic impact wrench is held, the partition plates are inclined vertically relative to the exhaust direction of the end of the grip handle.

[0015] According to the exhaust structure of the pneumatic impact wrench in the embodiment of this application, the end of the grip handle is provided with a sound-absorbing cotton mounting position at the exhaust channel. The exhaust channel has an arc-shaped limiting concave wall on the inner side wall away from the air inlet end at the sound-absorbing cotton mounting position. There is a thick sound-absorbing cotton mounting space between the limiting concave wall and the inner end wall of the exhaust part.

[0016] According to the exhaust structure of the pneumatic impact wrench in the embodiment of this application, the side of the end of the grip handle near the exhaust part forms a radially expanded portion, and the outer end wall of the expanded portion and the outer end walls of the ends of the grip handles on both sides form a rounded convex arc-shaped wall.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a partial structural schematic diagram of a pneumatic impact wrench according to some embodiments of this application;

[0020] Figure 2 This is a partial cross-sectional schematic diagram of the exhaust structure of a pneumatic impact wrench according to some embodiments of this application;

[0021] Figure 3 This is one of the partial schematic diagrams of the exhaust structure of a pneumatic impact wrench according to some embodiments of this application;

[0022] Figure 4 This is a second partial schematic diagram of the exhaust structure of a pneumatic impact wrench according to some embodiments of this application;

[0023] Figure 5 This is one of the schematic diagrams of the exhaust end cap of an exhaust structure according to some embodiments of this application;

[0024] Figure 6 This is a second schematic diagram of the exhaust end cap of an exhaust structure according to some embodiments of this application.

[0025] Reference numerals: grip handle 10, air intake channel 101, exhaust channel 102, concave receiving groove 103, slot 104, inner slot 105, limiting concave wall 106, outward expansion 107, outward convex arc-shaped wall 108;

[0026] Inlet end 20, annular outward expansion pressure joint 201;

[0027] Exhaust end cap 30, connection hole 301, exhaust part 302, ground support wall 303, mounting base plate 304, locking block 305, partition plate 306;

[0028] 40mm head assembly end;

[0029] Sound-absorbing cotton installation position 50. Detailed Implementation

[0030] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0031] The following is in conjunction with the appendix Figure 1-6 The exhaust structure of the pneumatic impact wrench according to an embodiment of this application is described. The exhaust structure is attached to the pneumatic impact wrench and includes: a grip handle 10, an air inlet end 20, and an exhaust end cover 30.

[0032] The handle 10 has an intake channel 101 and an exhaust channel 102. The intake channel 101 has a threaded connection hole (unmarked) at the intake end, and the matching intake end head 20 has a threaded connection section (unmarked). The threaded connection section is screwed into the threaded connection hole, so that the intake end head 20 is detachably threaded to the end of the handle 10. At the same time, the exhaust end cap 30 has a connection hole 301. Before screwing, the exhaust end cap 30 is fitted onto the intake end head 20 through the connection hole 301. As the intake end head 20 is screwed in, the edge of the exhaust end cap 30 at the connection hole 301 is slowly pressed by the intake end head 20 until it is pressed against the end of the handle 10.

[0033] The exhaust end cap 30 is configured with an exhaust section 302 that is inclined relative to the exhaust direction of the end of the grip handle 10. The exhaust direction of the exhaust section 302 is inclined relative to the exhaust direction of the end of the grip handle 10 and away from the palm base when gripped. Simultaneously, the outer end of the exhaust section 302 is also configured with a ground support wall 303 that is inclined relative to the exhaust direction of the exhaust section 302.

[0034] Understandably, after the exhaust gas passes through the exhaust channel 102, it enters the end of the handle 10. If the gas at the end of the handle 10 were to spray directly out along the exhaust direction, it would directly hit the heel of the hand, creating a safety hazard. The exhaust section 302 changes the direction of gas ejection, positioning it away from the heel of the hand, making it relatively safer. The ground support wall 303 serves as a ground support surface when the pneumatic impact wrench is tilted, thus ensuring stable tilting. It should be noted that when the pneumatic impact wrench is tilted, another support point relies on a socket (not shown) of a certain length and size additionally installed on the wrench. This socket is fitted onto the head fitting end 40 of the pneumatic impact wrench.

[0035] In some embodiments, the crimping of the intake end cap 20 with the exhaust end cap 30 has been optimized and improved to increase the reliability and durability of the crimping. Specifically, the exhaust end cap 30 includes a mounting base 304 and the aforementioned exhaust portion 302 integrally formed on the mounting base 304. The mounting base 304 has the aforementioned connection hole 301 on the portion opposite to the exhaust portion 302 for the intake end cap 20 to be fitted into. The intake end cap 20 has a radially outwardly protruding annular crimping portion 201 at the fitting point. The edge of the annular crimping portion 201 extends to the edge of the mounting base 304 opposite to the exhaust portion 302.

[0036] By expanding the annular outward-expanding crimping portion 201, the crimping area on the mounting substrate 304 is increased. With the increased crimping area, the reliability and firmness of the crimping connection are improved to a certain extent.

[0037] In conjunction with this, the end of the grip handle 10 is configured with a concave receiving groove 103 that communicates with the air intake channel 101 and the exhaust channel 102, and the root of the mounting base plate 304 of the exhaust end cover 30 is disposed in the concave receiving groove 103 to form a concealed installation.

[0038] As can be seen, with the ingenious design of the concealed structure, on the one hand, the recessed receiving groove 103 and the root of the mounting base 304 form a positioning fit effect, and on the other hand, the concealed root can increase the thickness of the exhaust section 302. While increasing the overall thickness and strength of the exhaust section 302, it can also effectively extend the running path of the gas in the exhaust section 302. Compared with the thinner plate structure in the prior art, it can form a more obvious exhaust path that is inclined downward in the direction opposite to the palm root.

[0039] During the connection of the intake end 20 and the exhaust end cap 30 to the end of the handle 10, the intake end 20 and the exhaust end cap 30 can be installed and connected simultaneously by rotating the intake end 20. Although this simplifies the installation and connection structure of the exhaust end cap 30 to some extent, the side of the exhaust end cap 30 that is opposite to the intake end 20 is far from the crimping point, and the connection strength between this part and the end of the handle 10 is relatively weak. Based on this, in some embodiments, structural improvements have been made to address this deficiency. Specifically, a radially protruding locking block 305 is provided on the side of the exhaust end cap 30 that is opposite to the intake end 20, and a locking groove 104 is provided on the bottom wall of the concave receiving groove 103 for the locking block 305 to be inserted and engaged. The locking groove 104 extends radially a certain distance on the side wall of the concave receiving groove 103 to form an inner locking groove 105.

[0040] During installation, first place the exhaust end cap 30 into the concave receiving groove 103. During the placement process, move the exhaust end cap 30 slightly toward the intake channel 101 (moving in the radial direction of the intake channel 101) to make room for the locking block 305 to move in. After it is fully inserted, the locking block 305 is located in the locking groove 104. Then move the exhaust end cap 30 back. At this time, the locking block 305 is at least partially inserted into the inner locking groove 105 to satisfy the locking connection.

[0041] As can be seen, the card block 305 and the intake end 20 are pressed together, and the two play a synergistic amplification role in the connection strength, so that the exhaust end cover 30 can be effectively installed and connected on both the side close to and away from the intake end 20.

[0042] In some embodiments, the exhaust end cover 30 has the following internal structure: Specifically, the exhaust end cover 30 has multiple parallel partition plates 306 inside the exhaust section 302. The partition plates 306 extend from the inner end wall of the exhaust section 302 along the exhaust direction to the outer end wall. When the pneumatic impact wrench is held, the partition plates 306 are inclined vertically relative to the exhaust direction of the handle 10. At this time, the gas is discharged from the channel between two adjacent partition plates 306, thereby dispersing the gas and reducing the discharge impact force.

[0043] Considering the significant noise generated when the exhaust gas is ejected, in order to reduce this noise, in this embodiment, a sound-absorbing cotton mounting position 50 is provided at the end of the handle 10 at the exhaust channel 102. An arc-shaped limiting recess 106 is constructed on the inner side wall of the exhaust channel 102 away from the air intake end 20 at the sound-absorbing cotton mounting position 50. There is a thick sound-absorbing cotton mounting space between the limiting recess 106 and the inner end wall of the exhaust part 302. That is to say, the inner end of the partition plate 306 forms a barrier to prevent the thick sound-absorbing cotton from falling out, and at the same time, the limiting recess 201 forms a barrier to prevent the thick sound-absorbing cotton from falling in. The barrier to prevent falling in can be understood as preventing it from falling into the interior of the pneumatic impact wrench. As can be seen, through the above-mentioned structure, the setting position of the limiting concave wall 106 on the inner side wall of the exhaust channel 102 can be set according to actual needs. That is, it can be set deep enough to match the installation of thick sound-absorbing cotton. After the thick sound-absorbing cotton is set, its sound-absorbing effect is more significant than that of the thin sound-absorbing cotton in the prior art.

[0044] In some embodiments, to avoid forming an abrupt, protruding connection structure and to achieve a rounded feel, a radially expanding portion 107 is formed on the side of the end of the grip handle 10 near the exhaust portion 302. The outer end wall of the expanding portion 107 and the outer end walls of the ends of the grip handle 10 on both sides form rounded, convex arc-shaped walls 108. The convex arc-shaped walls 108 are generally rounded, without any sharp protruding structures, which has advantages in preventing bumps and knocks, and also provides a rounded and comfortable feel when touched.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An exhaust structure for a pneumatic impact wrench, comprising a grip handle having an air inlet channel and an exhaust channel arranged in parallel, wherein the grip handle has an air inlet end and an exhaust end cap at its end, and the exhaust end cap is pressed against the end of the grip handle by a screw-on connection between the air inlet end and the end of the grip handle; characterized in that: The exhaust end cap is constructed with an exhaust section that is inclined relative to the exhaust direction of the end of the grip handle. The exhaust direction of the exhaust section is inclined relative to the exhaust direction of the end of the grip handle and is away from the palm base when gripping. The outer end of the exhaust section is also constructed with a ground support wall that is inclined relative to the exhaust direction of the exhaust section.

2. The exhaust structure of the pneumatic impact wrench according to claim 1, characterized in that, The exhaust end cap has a mounting base and an exhaust portion integrally formed on the mounting base. The portion of the mounting base opposite to the exhaust portion is provided with a connection hole for the intake end to be fitted. The intake end has a radially outwardly protruding annular expansion crimping portion at the fitting point. The edge of the annular expansion crimping portion extends to the edge of the mounting base opposite to the exhaust portion.

3. The exhaust structure of the pneumatic impact wrench according to claim 2, characterized in that, The end of the grip handle is configured with a concave receiving groove that communicates with the air intake and exhaust channels, and the root of the mounting base plate of the exhaust end cover is disposed in the concave receiving groove to form a concealed installation.

4. The exhaust structure of the pneumatic impact wrench according to claim 3, characterized in that, The exhaust end cover has a radially protruding locking block on the side opposite to the intake end. The bottom wall of the concave receiving groove is provided with a locking groove for the locking block to be inserted and engaged. The locking groove continues to extend radially a certain distance on the side wall of the concave receiving groove.

5. The exhaust structure of the pneumatic impact wrench according to claim 1, characterized in that, The exhaust end cover has multiple parallel partition plates inside the exhaust section. The partition plates extend from the inner end wall of the exhaust section to the outer end wall along the exhaust direction. When the pneumatic impact wrench is held, the partition plates are inclined vertically relative to the exhaust direction of the handle end.

6. The exhaust structure of the pneumatic impact wrench according to claim 5, characterized in that, The end of the grip handle is provided with a sound-absorbing cotton mounting position at the exhaust channel. An arc-shaped limiting concave wall is constructed on the inner side wall of the exhaust channel away from the air intake end at the sound-absorbing cotton mounting position. There is a thick sound-absorbing cotton mounting space between the limiting concave wall and the inner end wall of the exhaust part.

7. The exhaust structure of the pneumatic impact wrench according to claim 6, characterized in that, The side of the grip handle near the exhaust port forms a radially flared portion, and the outer end wall of the flared portion and the outer end walls of the grip handles on both sides form rounded, convex arc-shaped walls.

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