Output mechanism for electric impact wrench and electric impact wrench

Abstract

The invention discloses an output mechanism for an electric impact wrench and the electric impact wrench, and belongs to the technical field of mechanical tools. A containing groove is formed in the portion, close to an output head, in the output mechanism of the electric impact wrench to contain a torque sensor, and the torque sensor is electrically connected with the electric impact wrench; the preset torque value is pre-input, the torque sensor detects the torque information of the output head in real time and outputs the torque information to the electric impact wrench, then torque output of the output end of the electric impact wrench is controlled, and the problem that the output torque is too large or too small is solved; the electric impact wrench comprising the output mechanism can accurately control the output torque of the electric impact wrench according to the input of a user, and the use precision and effect of the electric impact wrench are improved.

Description

Technical Field

[0001] This application belongs to the field of mechanical technology, and particularly relates to an output mechanism for an electric impact wrench and an electric impact wrench. Background Art

[0002] An electric impact wrench is a very commonly used device in installation and maintenance. The working principle of existing electric impact wrenches is that during the design process, the manufacturer appropriately selects the motor power of the electric impact wrench to achieve the designed rated output torque value. When consumers actually use it, they only press the button by hand to control the electrode current, and then control the rotation speed and output torque of the impact socket.

[0003] Since existing electric impact wrenches do not have a torque detection function, during actual use, it is very easy to cause the output torque to be too small to pre-tighten the bolt, or the output torque to be too large, resulting in the pre-tightened bolt breaking, leading to operation failure and even safety risks. Summary of the Invention

[0004] In order to solve the above problem of inaccurate torque output of electric impact wrenches in the prior art, this application proposes a torque sensor for an electric impact wrench and an electric impact wrench. By developing a torque detection function on the basis of the electric impact wrench, accurate detection of the output torque of the impact wrench is achieved.

[0005] In the first aspect of this application, an output mechanism (2) for an electric impact wrench is disclosed, which includes an output head (3), an impact block (5), and a torque sensor (6). The impact block (5) is used to receive the torque of the electric impact wrench and transmit it to the output head (3), and the torque sensor (6) is used to measure the torque value output by the output head (3).

[0006] Further, the output structure (2) includes a shaft body (4), the shaft body (4) is connected to the output head (3) and the impact block (5), and a receiving groove (7) is provided on the shaft body (4) for receiving the torque sensor (6).

[0007] Further, the torque sensor (6) includes an elastic body (61), the elastic body (61) is arranged in the receiving groove (7), and is used to sense the torque received by the output head and deform when subjected to torque.

[0008] Further, the torque sensor (6) includes a sensitive element (62), the sensitive element (62) is evenly or symmetrically distributed on the elastic body (61), and is used to measure the deformation signal of the elastic body (61). The number of the sensitive elements (62) is an integer multiple of 4.

[0009] Further, a carbon brush slip ring (8) is also installed on the output mechanism (2). The carbon brush slip ring (8) is arranged on the shaft body (4) and is used for electrically connecting with the torque sensor (6).

[0010] Further, the accommodating groove (7) further includes a wire groove (64). The wire groove (64) is adjacent to the accommodating groove (7) and is used for accommodating the power cord and signal cable connecting the carbon brush slip ring (8) and the torque sensor (6).

[0011] Further, the impact block (5) of the output mechanism (2) is provided with two convex blocks, which are used for cooperating with an electric impact wrench to obtain the output torque of the electric impact wrench and transmit it to the output head.

[0012] In the second aspect of the present application, the present application discloses an electric impact wrench including the output mechanism (2) described in any one of the first aspects. The electric impact wrench includes a transmission mechanism, and the transmission structure cooperates with the output mechanism to transmit the output torque of the electric impact wrench to the output mechanism.

[0013] Further, the electric impact wrench further includes a housing (13). A support bushing (14) is arranged on the housing (13), and the support bushing (14) is used for supporting the output mechanism (2) and restricting the axial and radial movements of the output mechanism (2).

[0014] Further, the electric impact wrench further includes an input device (110) and a display device (120). The input device (110) is used for inputting the working mode and preset torque value of the electric impact wrench; the display device (120) is used for displaying the information input by the user and the working information of the electric wrench.

[0015] The present application discloses an output mechanism for an electric impact wrench and an electric impact wrench, belonging to the technical field of mechanical tools. By arranging an accommodating groove near the output head in the output mechanism of the electric impact wrench to accommodate the torque sensor, electrically connecting the torque sensor with the electric impact wrench, pre-inputting a preset torque value, and the torque sensor real-time detecting the torque information of the output head and outputting it to the electric impact wrench, thereby controlling the torque output at the output end of the electric impact wrench, avoiding the problem of too large or too small output torque, enabling the electric impact wrench including this output mechanism to accurately control the output torque of the electric impact wrench according to the user's input, and improving the use accuracy and effect of the electric impact wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the electric impact wrench in the present application; Figure 2 is a schematic diagram of the output mechanism for the electric impact wrench in the present application; Figure 3 Schematic diagram of the torque sensor of the output mechanism in this application; Figure 4 Cross-sectional view of the electric impact wrench in this application. Specific implementation manners

[0017] Next, the technical solutions in the embodiments of this application will be further clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. It should be noted that the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of this application.

[0018] In order to make the invention purpose, technical solutions and advantages of this application clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with the accompanying drawings and specific implementation manners. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this invention, several changes and improvements can still be made, and these all belong to the scope of protection of this application.

[0019] The electric impact wrench is a very commonly used device in installation and maintenance. The working principle of the existing electric impact wrench is that the manufacturer appropriately selects the motor power of the electric impact wrench during design to achieve the design of the rated output torque value. When consumers actually use it, they only press the button by hand feeling to control the electrode current, and then control the rotation speed and output torque of the impact socket.

[0020] Since the existing electric impact wrench does not have a torque detection function, it is very easy to cause the output torque to be too small to pre-tighten the bolt or the output torque to be too large, resulting in the fracture of the pre-tightened bolt during actual use, leading to operation failure and even safety risks.

[0021] To solve the above problems existing in the prior art, this application discloses an output mechanism for an electric impact wrench. The output device controls the torque output at the output end of the electric impact wrench through real-time detection of the torque sensor by setting a torque sensor at the output head of the electric impact wrench and connecting the torque sensor to the impact head, avoiding the problem of too large or too small output torque. At the same time, this application also discloses an electric impact wrench including an output mechanism for an electric impact wrench. This electric impact wrench can accurately control the output torque of the electric impact wrench according to the user's input, improving the use accuracy and effect of the electric impact wrench. Figure 1 In the middle is a schematic diagram of the electric impact wrench (1) in this application.

[0022] The following further details the embodiments of this application in conjunction with the accompanying drawings of the specification: AsFigure 2 As shown in the figure, in the first embodiment of the present application, the present application discloses an output mechanism 2 for an electric impact wrench, including an output head 3, a shaft body 4, and an impact block 5. The output head 3 and the impact block 5 are connected by the shaft body 4. The impact block 5 is connected to the drive system of the electric impact wrench and transmits the rotational impact of the electric impact wrench to the output head 3 through the shaft body 4. The output head 3 is of a square structure. The front end of the output head 3 is for a wrench head, and the models of the wrench heads include various types, which are used to adapt to bolts of different models. In actual use, the wrench head transmits the output torque to the bolt to achieve the pre-tightening of the bolt. In an embodiment of the present application, the output head 3, the shaft body 4, and the impact block 5 are integrally formed. Further, the output mechanism 2 further includes a torque sensor 6.

[0023] As Figure 3 shown, a receiving groove 7 is provided on the shaft body 4 of the output structure 2 for receiving the torque sensor 6. In actual use, the impact block 5 rotates under the action of the drive system of the electric impact wrench. The impact block 5 drives the shaft body 4 to rotate and outputs the torque to the outside through the output head 3. The torque sensor 6 then measures the output torque output to the outside in real time and outputs it to the electric impact wrench 1. The receiving groove 7 on the shaft body 4 of the output structure 2 includes a circular ring part and a protruding part. The torque sensor 6 includes an elastomer 61, a sensitive element 62, and a flexible circuit board 63. The elastomer 61 is arranged along the circular ring part of the receiving groove. The sensitive element 62 is arranged on the elastomer 61. The sensitive element 62 can measure the physical signal of the tiny deformation of the elastomer 61 under the action of torque and process this signal. To obtain accurate torque information, the sensitive elements 62 are evenly distributed or symmetrically arranged on the elastomer 61. The number of sensitive elements 62 is an integer multiple of 4, such as 4, 8, 12, etc. When the number of sensitive elements 62 is 4, the sensitive elements 62 are symmetrically arranged on the elastomer. The torque sensor 6 further includes a flexible circuit board 63. The flexible circuit board 63 is arranged in the circular ring part of the receiving groove and is electrically connected to the sensitive element 62 for receiving the information of the sensitive element 62 and transmitting it to the electric impact wrench. The torque sensor 6 further includes a wire groove 64 for receiving the cable output by the torque sensor. The wire groove 64 is located in the protruding part of the receiving groove.

[0024] In addition, a carbon brush slip ring 8 is also installed on the output mechanism. The carbon brush slip ring 8 is arranged on the shaft body 4 and is used for electrically connecting with the torque sensor 6. In an embodiment of the present application, specifically, the carbon brush slip ring 8 is arranged on the wire groove and is electrically connected with the flexible circuit board 63, and is used for receiving the torque signal collected by the sensitive element 62 and supplying power to the sensitive element 62. The carbon brush slip ring 8 includes an inner ring and an outer ring (not shown in the figure). The inner ring is fixedly connected with the shaft body, and the outer ring is fixedly connected with the electric impact wrench. The inner ring and the outer ring can rotate relative to each other, and are electrically connected. The inner ring is connected with the flexible circuit board 63 through a cable. During the rotation of the shaft body 4 driving the torque sensor 6, the inner ring rotates together with the torque sensor 6. After the sensitive element 62 of the torque sensor 6 obtains the measurement information, it is connected with the inner ring of the carbon brush slip ring 8 through the flexible circuit board 63, and the information is transmitted to the electric impact wrench through the outer ring.

[0025] Furthermore, the output mechanism 2 is connected with the electric impact wrench and is used for obtaining the output torque of the electric impact wrench. Specifically, two protrusions are arranged on the impact block 5 of the output mechanism and are used for cooperating with the electric impact wrench to obtain the output torque of the electric impact wrench and transmit it to the output head.

[0026] In the second embodiment of the present application, the present application discloses an electric impact wrench, which includes the output structure in the first embodiment. By setting the output structure in the first embodiment, the electric impact wrench in this embodiment has the torque detection function, can realize the detection of the real-time output torque, avoid the problems of too large or too small torque, and greatly improve the use accuracy and operation efficiency.

[0027] In an embodiment of the present application, the electric impact wrench 1 includes a transmission structure 11. The transmission structure 11 cooperates with the output mechanism 2 and is used for transmitting the output torque of the electric impact wrench to the output mechanism 2 to perform work on the external bolt. Specifically, the transmission structure 11 includes a transmission shaft 12. The transmission shaft 12 cooperates with the impact block 5 of the output mechanism 2 and transmits the output torque of the transmission shaft 12 to the outside. The transmission shaft restricts the movement of the impact block 5 of the output mechanism in the radial and axial directions and only allows the output mechanism to move circumferentially, and then transmits the output torque of the transmission shaft to the output head.

[0028] The electric impact wrench includes a housing 13. A support shaft sleeve 14 is arranged on the housing 13. The support shaft sleeve 14 is used for supporting the output mechanism 2 and restricting the axial and radial movement of the output mechanism 2 to ensure the stability of the output of the electric impact wrench. Specifically, the torque sensor 6 passes through the support shaft sleeve 14 and is fixed. The support shaft sleeve 14 is rotatably connected with the output mechanism 2 and is used for supporting the torque sensor 6 and restricting the axial movement of the torque sensor 6, which can not only ensure the stability of the torque sensor 6, but also improve the measurement accuracy of the torque sensor 6.

[0029] Further, the electric impact wrench further includes an input device 110 for inputting the working mode and preset torque value of the electric impact wrench. By providing the input device, the user can select the torque function. The user can select a suitable working mode according to needs and select a suitable torque value according to actual requirements to ensure reliable and safe installation.

[0030] In addition, the electric impact wrench further includes a display device 120. The information input by the user through the input device 110 can be displayed on the display device 120. At the same time, the display device 120 can also be used to display the actually output torque value when using the electric impact wrench, helping the user to know the output torque size in the first time, and then adjusting the power of the drive system by controlling the pressing depth of the electric impact wrench, so as to quickly reach the preset torque value, and then realize the pre-tightening of the bolt, which is simple and fast, and improves the operation convenience.

[0031] In this application, a receiving groove is provided at a position close to the output head in the output mechanism of the electric impact wrench to accommodate the torque sensor, and the torque sensor is electrically connected to the electric impact wrench. By pre-inputting a preset torque value, the torque sensor can detect the torque information of the output head in real time and output it to the electric impact wrench, so as to control the torque output of the output end of the electric impact wrench, avoiding the problem of too large or too small output torque, enabling the electric impact wrench including this output mechanism to accurately control the output torque of the electric impact wrench according to the user's input, and improving the use accuracy and effect of the electric impact wrench.

Claims

1. An output mechanism (2) for an electric impact wrench, characterized in that, It includes an output head (3), an impact block (5) and a torque sensor (6). The impact block (5) is used to receive the torque of the electric impact wrench and transmit it to the output head (3), and the torque sensor (6) is used to measure the torque value output by the output head (3).

2. The output mechanism (2) according to claim 1, characterized in that, The output structure (2) includes a shaft body (4). The shaft body (4) is connected to the output head (3) and the impact block (5). A receiving groove (7) is provided on the shaft body (4) for receiving the torque sensor (6).

3. The output mechanism according to claim 2, wherein, The torque sensor (6) includes an elastomer (61). The elastomer (61) is disposed in the receiving groove (7) and is used to sense the torque received by the output head and deform when subjected to torque.

4. The output mechanism according to claim 3, characterized in that The torque sensor (6) includes a sensing element (62). The sensing elements (62) are evenly or symmetrically distributed on the elastomer (61) and are used to measure the deformation signal of the elastomer (61). The number of the sensing elements (62) is an integer multiple of 4.

5. The output mechanism according to claim 4, wherein A carbon brush slip ring (8) is also installed on the output mechanism (2). The carbon brush slip ring (8) is disposed on the shaft body (4) and is used for electrical connection with the torque sensor (6).

6. The output mechanism according to claim 5, wherein The receiving groove (7) further includes a wire groove (64). The wire groove (64) is adjacent to the receiving groove (7) and is used to receive the power cord and signal cable for connecting the carbon brush slip ring (8) and the torque sensor (6).

7. The output mechanism according to claim 6, characterized in that, Two protrusions are provided on the impact block (5) of the output mechanism (2) for cooperating with the electric impact wrench to obtain the output torque of the electric impact wrench and transmit it to the output head.

8. An electric impact wrench comprising the output mechanism (2) according to any one of claims 1-7, characterized in that, It includes a transmission mechanism. The transmission structure cooperates with the output mechanism to transmit the output torque of the electric impact wrench to the output mechanism.

9. The electric impact wrench according to claim 8, characterized in that, It includes a housing (13). A support bushing (14) is provided on the housing (13). The support bushing (14) is used to support the output mechanism (2) and restrict the axial and radial movements of the output mechanism (2).

10. The electric impact wrench according to claim 9, characterized in that, The electric impact wrench further includes an input device (110) and a display device (120). The input device (110) is used to input the working mode and preset torque value of the electric impact wrench; the display device (120) is used to display the information input by the user and the working information of the electric wrench.

Images