Hammer body structure for impact wrench and impact wrench

Abstract

The hammer body structure comprises a hammer body, a hammer body frame and a hammer body shaft, the hammer body is provided with a first hollow cavity, the hammer body frame is provided with a second hollow cavity and an opening communicated with the second hollow cavity, and the hammer body is connected with the inner wall of the second hollow cavity. Part of the hammer body extends out of the second hollow cavity through the opening, the hammer body shaft is rotationally arranged in the first hollow cavity, a hammering part is arranged on the inner wall of the first hollow cavity, and a hammered part corresponding to the hammering part is arranged on the hammer body shaft. According to the hammer body structure, part of the structure of the hammer body can extend out of the second hollow cavity through the opening, the rotational inertia of the hammer body is increased to a certain extent, when the hammering part makes contact with the impacted part, the hammer body hammers the hammer body shaft, large impact moment is generated, and the impact force of the hammer body shaft is improved. Therefore, the fastening piece can be assembled and disassembled in a labor-saving mode, output power is large enough, and the device can meet the requirements of some large-torque working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of impact wrenches, in particular to a hammer structure for an impact wrench and the impact wrench. Background Art

[0002] Impact wrenches mainly include pneumatic wrenches, hydraulic wrenches, electric wrenches, etc., which assist in installing or removing fasteners such as bolts and nuts by outputting a large torque. However, the torque of the impact wrenches in the prior art is relatively small and cannot meet the use requirements. Utility Model Content

[0003] In view of this, the utility model aims to provide an impact wrench to solve the technical problem of low torque of impact wrenches in the prior art.

[0004] The utility model provides a hammer structure for an impact wrench, comprising a hammer, a hammer frame and a hammer shaft, wherein the hammer is provided with a first hollow cavity, the hammer frame is provided with a second hollow cavity and an opening connected to the second hollow cavity, the hammer is connected to the inner wall of the second hollow cavity, a part of the hammer extends to the outside of the second hollow cavity through the opening, the hammer shaft is rotatably arranged in the first hollow cavity, a hammering part is provided on the inner wall of the first hollow cavity, and a struck part corresponding to the hammering part is provided on the hammer shaft.

[0005] Furthermore, the openings are symmetrically arranged on the side walls on both sides of the hammer frame, and the hammer body at least includes a first part and a second part that are symmetrically arranged to each other, and the first part and the second part extend to the outside of the second hollow cavity through the openings respectively.

[0006] Furthermore, the hammer frame is provided with a plurality of the second hollow cavities, the plurality of hammers are respectively connected to the inner walls of the plurality of the second hollow cavities, a partition is provided between the plurality of the second hollow cavities, the partition is provided with a through hole, the hammer shaft passes through the through hole, so as to be arranged in the first hollow cavity of the plurality of the hammers.

[0007] Furthermore, a positioning shaft is provided on the inner wall of the second hollow cavity, a positioning groove is provided on the hammer body, and the positioning shaft is connected to the positioning groove.

[0008] Further, the positioning groove includes a first positioning groove and a second positioning groove, the first positioning groove and the second positioning groove are arranged on the side wall of the hammer body facing the hammer body frame, the second positioning groove is extended along the rotation direction of the hammer body, and the hammer body frame is provided with multiple positioning shafts, at least one of the positioning shafts is cooperatively connected with the first positioning groove, and the remaining positioning shafts are slidably connected with the second positioning groove and are used to abut the inner walls at both ends of the second positioning groove.

[0009] The utility model also provides an impact wrench, comprising a driving structure and the hammer structure, wherein the driving structure comprises a hydraulic motor and a switch valve connected to each other, the hydraulic motor is transmission-connected to the hammer frame, and a switch wrench is arranged on the switch valve.

[0010] Furthermore, it also includes a reversing valve connected to the hydraulic motor, and a reversing wrench is provided on the reversing valve.

[0011] Furthermore, it also includes a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet pipeline is connected to one interface of the hydraulic motor through the switch valve, and the liquid outlet pipeline is connected to another interface of the hydraulic motor.

[0012] Furthermore, a spline connection groove is provided on the hammer frame, and a spline shaft is provided on the hydraulic motor to cooperate and connect with the spline connection groove.

[0013] Furthermore, the hydraulic medium in the hydraulic motor is an emulsion.

[0014] The hammer structure of the utility model has a hammer frame with a second hollow cavity and an opening, so that part of the structure of the hammer can extend to the outside of the second hollow cavity through the opening, thereby increasing the rotational inertia of the hammer to a certain extent. The hammer frame drives the hammer to rotate, and a hammer shaft is rotated in the first hollow cavity of the hammer. When the hammering part on the inner wall of the first hollow cavity contacts the struck part on the hammer shaft, the hammer strikes the hammer shaft, generating a large impact torque. The hammer shaft is connected to fasteners such as bolts and screws, so that the loading and unloading of the fasteners can be completed more laboriously, with high work efficiency, and the output power is large enough to meet the needs of some large torque working conditions.

[0015] The impact wrench of the utility model has all the beneficial effects of the above-mentioned hammer structure, which will not be described in detail here.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a cross-sectional schematic diagram of the impact wrench provided by the utility model;

[0019] Figure 2 This is one of the structural schematic diagrams of the impact wrench provided by the utility model;

[0020] Figure 3 It is a structural schematic diagram of the hammer frame provided by the utility model;

[0021] Figure 4 It is a structural schematic diagram of the hammer body provided by the utility model;

[0022] Figure 5 It is a structural schematic diagram of the hammer shaft provided by the utility model;

[0023] Figure 6 This is the second structural schematic diagram of the impact wrench provided by the utility model.

[0024] The above drawings include the following reference numerals:

[0025] 1. Hammer; 11. First hollow cavity; 111. Hammering part; 12. First part; 13. Second part; 14. Positioning groove; 141. First positioning groove; 142. Second positioning groove; 2. Hammer frame; 21. Second hollow cavity; 211. Positioning shaft; 22. Opening; 23. Partition; 231. Through hole; 24. Spline connection groove; 3. Hammer shaft; 31. Striking part; 4. Hydraulic motor; 41. Spline shaft; 5. Switch valve; 51. Switch wrench; 6. Reversing valve; 61. Reversing wrench; 7. Liquid inlet pipeline; 8. Liquid outlet pipeline. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but are not intended to limit the present invention.

[0027] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the utility model will occur to those skilled in the art.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present invention.

[0030] The utility model provides a hammer structure for an impact wrench, comprising a hammer 1, a hammer frame 2 and a hammer shaft 3, wherein the hammer 1 is provided with a first hollow cavity 11, the hammer frame 2 is provided with a second hollow cavity 21 and an opening 22 connected to the second hollow cavity 21, the hammer 1 is connected to the inner wall of the second hollow cavity 21, a part of the hammer 1 extends to the outside of the second hollow cavity 21 through the opening 22, the hammer shaft 3 is rotatably arranged in the first hollow cavity 11, a hammering part 111 is provided on the inner wall of the first hollow cavity 11, and a struck part 31 corresponding to the hammering part 111 is provided on the hammer shaft 3.

[0031] Combination Figures 1 to 6As shown, the hammer body 1 is provided with a first hollow cavity 11, and the hammer body frame 2 is provided with a second hollow cavity 21 and an opening 22. The opening 22 connects the second hollow cavity 21 with the outer space of the hammer body frame 2. The hammer body 1 is connected to the inner wall of the second hollow cavity 21, so that when the hammer body frame 2 rotates, the hammer body 1 can rotate with the hammer body frame 2, and obviously, the main part of the hammer body 1 is located in the second hollow cavity 21, and the remaining part of the hammer body 1 can extend out of the second hollow cavity 21 through the opening 22. The hammer body shaft 3 is rotatably arranged in the first hollow cavity 11, and the inner wall of the first hollow cavity 11 (that is, the inner wall of the hammer body 1) is provided with a hammering part 111 protruding from the inner wall, and a struck part 31 protruding from the hammer body shaft 3 is provided on the hammer body shaft 3 corresponding to the hammering part 111. When the driving structure of the impact wrench drives the hammer frame 2 to rotate, the hammer 1 rotates accordingly. During this process, the hammer shaft 3 can be regarded as relatively stationary until the hammering part 111 contacts the struck part 31, so that the struck part 31 and the hammer shaft 3 are hammered by the hammering part 111 and rotate. The hammer shaft 3 can be connected with fasteners such as screws and bolts through other tools, thereby providing a larger instantaneous starting impact torque.

[0032] Furthermore, the openings 22 are symmetrically arranged on the side walls of both sides of the hammer frame 2 , and the hammer 1 at least includes a first portion 12 and a second portion 13 symmetrically arranged with each other, and the first portion 12 and the second portion 13 extend to the outside of the second hollow cavity 21 through the openings 22 respectively.

[0033] Combination Figure 3 and Figure 6 As shown, the second hollow cavity 21 is equivalent to a cavity penetrating the hammer frame 2, and two openings 22 that are symmetrical to each other are formed on both sides of the hammer frame 2. The hammer 1 has a first portion 12 and a second portion 13 that are symmetrical to each other. The first portion 12 and the second portion 13 are respectively arranged in the two openings 22, that is, the first portion 12 and the second portion 13 extend to the outside of the second hollow cavity 21 through the two openings 22, respectively. The specific shape formed after the extension is not limited here, as long as the symmetry can be maintained.

[0034] In this way, by symmetrically arranging the two openings 22 and the symmetrically arranging the first part 12 and the second part 13, the stability of the hammer body 1 and the hammer frame 2 during rotation can be ensured. By extending the first part 12 and the second part 13 through the opening 22 to the outside of the second hollow cavity 21, the rotational inertia of the hammer body 1 is further increased to increase the impact torque generated by the hammer shaft 3, which can be suitable for some working scenarios requiring large torque.

[0035] Preferably, the hammer frame 2 is provided with a plurality of the second hollow cavities 21, the plurality of hammers 1 are respectively connected to the inner walls of the plurality of the second hollow cavities 21, a partition 23 is provided between the plurality of the second hollow cavities 21, the partition 23 is provided with a through hole 231, the hammer shaft 3 passes through the through hole 231, so as to be arranged in the first hollow cavity 11 of the plurality of hammers 1.

[0036] For example, in combination Figure 3 and Figure 6 As shown, the hammer frame 2 is provided with two second hollow cavities 21, and the two hammer bodies 1 are respectively connected to the inner walls of the two second hollow cavities 21, so that when the hammer frame 2 rotates, the two hammer bodies 1 can be driven to rotate together, and the hammer shaft 3 passes through the through hole 231, so that it can extend into the first hollow cavity 11 of the two hammer bodies 1 to hammer the two hammer bodies 1, thereby increasing the overall rotational inertia of the hammer bodies 1, and then increasing the impact torque output by the hammer shaft 3. The specific number of the second hollow cavities 21 and the hammer bodies 1 can be designed according to needs, as long as the impact torque requirements can be met.

[0037] Furthermore, a positioning shaft 211 is provided on the inner wall of the second hollow cavity 21 , a positioning groove 14 is provided on the hammer body 1 , and the positioning shaft 211 is connected to the positioning groove 14 .

[0038] Combination Figure 3 , Figure 4 and Figure 6 As shown, a positioning shaft 211 is provided on the inner wall of the second hollow cavity 21, and the rotation axes of the hammer body 1, the hammer body frame 2 and the hammer body shaft 3 are parallel to each other. A positioning groove 14 is provided on the hammer body 1. When the positioning shaft 211 rotates with the hammer body frame 2, the torque can be transmitted to the hammer body 1 through the positioning groove 14, so that the hammer body 1 rotates.

[0039] Furthermore, the positioning groove 14 includes a first positioning groove 141 and a second positioning groove 142, the first positioning groove 141 and the second positioning groove 142 are opened on the side wall of the hammer body 1 facing the hammer body frame 2, the second positioning groove 142 is extended along the rotation direction of the hammer body 1, and a plurality of positioning shafts 211 are provided on the hammer body frame 2, at least one of the positioning shafts 211 is cooperated and connected with the first positioning groove 141, and the remaining positioning shafts 211 are slidably connected with the second positioning groove 142 and are used to abut the inner walls at both ends of the second positioning groove 142.

[0040] For example, in combination Figure 6As shown, two side walls of the hammer body 1 face the hammer body frame 2, and a first positioning groove 141 and a second positioning groove 142 are respectively provided on the two side walls, wherein the second positioning groove 142 is similar to an arc groove structure and is extended along the rotation direction of the hammer body 1. Two positioning shafts 211 are provided on the hammer body frame 2, and one positioning shaft 211 is matched with the first positioning groove 141 (it can be an interference fit, transition fit or clearance fit), so that the hammer body 1 is relatively fixedly connected to the hammer body frame 2 at the positioning shaft 211, and the other positioning shaft 211 is slidably connected to the second positioning groove 142, so that the positioning shaft 211 can slide along the second positioning groove 142 in the rotation direction of the hammer body 1 (equivalent to the positioning shaft 211 swinging around the hammer body 1), providing a certain buffer gap between the hammer body frame 2 and the hammer body 1.

[0041] It is understandable that the specific number of the positioning shafts 211 can be designed according to the needs so as to be matched and slidably connected with the first positioning groove 141 and the second positioning groove 142 respectively, and no specific limitation is made here.

[0042] The hammer structure of the utility model has a hammer frame 2 with a second hollow cavity 21 and an opening 22, so that part of the structure of the hammer 1 can extend to the outside of the second hollow cavity 21 through the opening 22, which increases the moment of inertia of the hammer 1 to a certain extent. The hammer frame 2 drives the hammer 1 to rotate, and a hammer shaft 3 is rotatably arranged in the first hollow cavity 11 of the hammer 1. When the hammering part 111 on the inner wall of the first hollow cavity 11 contacts the struck part 31 on the hammer shaft 3, the hammer 1 hammers the hammer shaft 3 to generate a large impact torque. The hammer shaft 3 is connected to fasteners such as bolts and screws, so that the loading and unloading of the fasteners can be completed more labor-savingly, with high work efficiency, and the output power is large enough to meet the needs of some large torque working conditions.

[0043] The utility model also provides an impact wrench, including a driving structure and the hammer structure, wherein the driving structure includes a hydraulic motor 4 and a switch valve 5 connected to each other, the hydraulic motor 4 is drivingly connected to the hammer frame 2, and the switch valve 5 is provided with a switch wrench 51.

[0044] Combination Figure 1 , Figure 2 and Figure 6 As shown, the switch valve 5 can be opened by the switch wrench 51, and the corresponding hydraulic medium can be pumped into the hydraulic motor 4 to make the hydraulic motor 4 run, thereby transmitting power to the hammer frame 2, driving the hammer frame 2 to rotate, and finally hammering the hammer shaft 3 through the hammer 1, thereby providing an impact torque, which is convenient for loading and unloading fasteners such as bolts and screws.

[0045] Furthermore, it also includes a reversing valve 6 connected to the hydraulic motor 4 , and a reversing wrench 61 is provided on the reversing valve 6 .

[0046] Combination Figure 1 and Figure 2 As shown, the working state of the reversing valve 6 can be switched by the reversing wrench 61. Generally speaking, the reversing valve 6 has two working states, corresponding to the forward and reverse working conditions of the hydraulic motor 4, so that the impact torque transmitted by the hammer shaft 3 can be adjusted in direction as needed, which is convenient for loading and unloading fasteners such as bolts and screws.

[0047] Furthermore, it also includes a liquid inlet pipeline 7 and a liquid outlet pipeline 8. The liquid inlet pipeline 7 is connected to one interface of the hydraulic motor 4 through the switch valve 5, and the liquid outlet pipeline 8 is connected to another interface of the hydraulic motor 4.

[0048] Combination Figure 1 As shown, the liquid inlet pipeline 7 is connected to the switch valve 5, and the switch valve 5 is connected to the oil inlet interface of the hydraulic motor 4, so that the hydraulic medium enters the hydraulic motor 4 through the liquid inlet pipeline 7 after the switch valve 5 is opened, and flows out through the oil outlet interface of the hydraulic motor 4 and the liquid outlet pipeline 8 to form a hydraulic circuit.

[0049] In this way, through the liquid inlet pipeline 7 and the liquid outlet pipeline 8, it is convenient to connect with the hydraulic power source to form a hydraulic circuit.

[0050] Preferably, combined Figure 1 and Figure 3 As shown, a spline connection groove 24 is provided on the hammer frame 2 , and a spline shaft 41 is provided on the hydraulic motor 4 to cooperate with and connect with the spline connection groove 24 .

[0051] In this way, the power of the hydraulic motor 4 can be transmitted to the hammer frame 2 in a relatively stable manner through the spline connection.

[0052] Preferably, the hydraulic medium in the hydraulic motor 4 is an emulsion.

[0053] In this way, the impact wrench uses emulsion as the hydraulic medium of its driving structure during use. Compared with ordinary hydraulic oil, emulsion can meet the fire and explosion protection requirements of working conditions such as mines, and has better safety.

[0054] In the hammer structure of the impact wrench of the utility model, the hammer frame 2 is provided with a second hollow cavity 21 and an opening 22, so that part of the structure of the hammer 1 can extend to the outside of the second hollow cavity 21 through the opening 22, which increases the moment of inertia of the hammer 1 to a certain extent. The hammer frame 2 drives the hammer 1 to rotate, and a hammer shaft 3 is rotatably provided in the first hollow cavity 11 of the hammer 1. When the hammering part 111 on the inner wall of the first hollow cavity 11 contacts the struck part 31 on the hammer shaft 3, the hammer 1 hammers the hammer shaft 3 to generate a large impact torque. The hammer shaft 3 is connected to fasteners such as bolts and screws, so that the loading and unloading of the fasteners can be completed more laboriously, with high working efficiency, and the output power is large enough to meet the needs of some large torque working conditions.

[0055] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0057] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present utility model.

[0058] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hammer structure for an impact wrench, characterized in that: The hammer body comprises a hammer body, a hammer body frame and a hammer body shaft, wherein the hammer body is provided with a first hollow cavity, the hammer body frame is provided with a second hollow cavity and an opening connected to the second hollow cavity, the hammer body is connected to the inner wall of the second hollow cavity, a part of the hammer body extends to the outside of the second hollow cavity through the opening, the hammer body shaft is rotatably arranged in the first hollow cavity, a hammering part is arranged on the inner wall of the first hollow cavity, and a struck part corresponding to the hammering part is arranged on the hammer body shaft.

2. The hammer structure according to claim 1, characterized in that: The openings are symmetrically arranged on the side walls on both sides of the hammer frame, and the hammer body at least includes a first part and a second part which are symmetrically arranged with each other, and the first part and the second part extend to the outside of the second hollow cavity through the openings respectively.

3. The hammer structure according to claim 1, characterized in that: The hammer frame is provided with a plurality of the second hollow cavities, the plurality of hammers are respectively connected to the inner walls of the plurality of the second hollow cavities, a partition is provided between the plurality of the second hollow cavities, the partition is provided with a through hole, the hammer shaft passes through the through hole, so as to be arranged in the first hollow cavity of the plurality of hammers.

4. The hammer structure according to claim 1, characterized in that: A positioning shaft is provided on the inner wall of the second hollow cavity, a positioning groove is provided on the hammer body, and the positioning shaft is connected to the positioning groove.

5. The hammer structure according to claim 4, characterized in that: The positioning groove includes a first positioning groove and a second positioning groove, the first positioning groove and the second positioning groove are arranged on the side wall of the hammer body facing the hammer body frame, the second positioning groove is extended along the rotation direction of the hammer body, and a plurality of positioning shafts are arranged on the hammer body frame, at least one of the positioning shafts is cooperatively connected with the first positioning groove, and the remaining positioning shafts are slidably connected with the second positioning groove and are used to abut the inner walls at both ends of the second positioning groove.

6. An impact wrench, characterized in that: It comprises a driving structure and the hammer structure according to any one of claims 1 to 5, wherein the driving structure comprises a hydraulic motor and a switch valve connected to each other, the hydraulic motor is transmission-connected to the hammer frame, and a switch wrench is provided on the switch valve.

7. The impact wrench according to claim 6, characterized in that It also includes a reversing valve connected to the hydraulic motor, and a reversing wrench is provided on the reversing valve.

8. The impact wrench according to claim 6, characterized in that It also includes a liquid inlet pipeline and a liquid outlet pipeline. The liquid inlet pipeline is connected to one interface of the hydraulic motor through the switch valve, and the liquid outlet pipeline is connected to another interface of the hydraulic motor.

9. The impact wrench according to claim 6, characterized in that The hammer frame is provided with a spline connection groove, and the hydraulic motor is provided with a spline shaft to cooperate with the spline connection groove.

10. The impact wrench according to claim 6, characterized in that The hydraulic medium in the hydraulic motor is an emulsion.

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