Length-adjustable electric wrench and use method thereof

Abstract

The invention provides a length-adjustable electric wrench and a using method thereof.The electric wrench comprises a motor driving component, an extension rod piece and a sleeve component which are sequentially connected, the motor driving component comprises a first steel pipe, and a rotating motor is connected to the middle of the closed end of the first steel pipe; the extension rod piece comprises a second steel pipe and a first inserting pipe connected to one end of the second steel pipe, and the first inserting pipe is inserted into the first steel pipe to be fastened. The sleeve component comprises a third steel pipe and a second inserting pipe connected to one end of the third steel pipe, the second inserting pipe is inserted into the second steel pipe to be fastened, and an inner hexagonal sleeve is arranged in the third steel pipe; and an infrared spotlight is arranged on the outer wall of the third steel pipe. The length of the wrench can be adjusted according to the to-be-installed height so that the wrench can be suitable for installation of nuts of different heights, and the nuts can be installed at the elevation position at a time.

Description

Technical Field

[0001] The present invention relates to the technical field of wrenches, and more specifically, to an electric wrench with adjustable length and its usage method. Background Art

[0002] In construction projects such as horizontal bridge decks, ventilation ducts, and ceiling works, the installation of nuts on screws at higher positions requires workers to stand on mobile scaffolding and hold a wrench for installation, which poses a safety hazard. In some installation positions, the space is limited and it is not easy to operate an electric wrench. In some cases, affected by the installation environment, the screwing of the nut cannot accurately reach the designed elevation, and secondary rotation is required, which is time-consuming and laborious. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide an electric wrench with adjustable length and its usage method, which can adjust the length of the wrench according to the installation height to be adapted to the installation of nuts at different heights, so that the nut can be installed at the elevation position at one time.

[0004] An electric wrench with adjustable length provided by the present invention includes a motor driving member, an extension rod member, and a socket member connected in sequence, wherein,

[0005] The motor driving member includes a first steel pipe, a rotating motor is connected to the middle of the closed end of the first steel pipe, and a first screw hole is opened on the outer wall of the open end of the first steel pipe;

[0006] The extension rod member includes a second steel pipe and a first insertion pipe connected to one end of the second steel pipe. A first threaded hole is provided on the first insertion pipe. The first insertion pipe is inserted into the first steel pipe and fastened by a bolt screwing the first screw hole and the first threaded hole. A second screw hole is provided at the other end of the second steel pipe;

[0007] The socket member includes a third steel pipe and a second insertion pipe connected to one end of the third steel pipe. A second threaded hole is provided on the second insertion pipe. The second insertion pipe is inserted into the second steel pipe and fastened by a bolt screwing the second screw hole and the second threaded hole. An internal hexagonal socket is provided inside the third steel pipe;

[0008] An infrared spotlight is provided on the outer wall of the third steel pipe. The light of the infrared spotlight is perpendicular to the central axis of the third steel pipe and intersects it, and the position of the infrared spotlight is adjustable along the height direction of the third steel pipe.

[0009] The inner diameters of the first steel pipe, the second steel pipe, and the third steel pipe are the same, the outer diameters of the first insertion pipe and the second insertion pipe are the same, and hole bottom plates are provided at the lower ends of the first threaded hole and the second threaded hole.

[0010] A kit is sleeved outside the first steel pipe. The kit includes a sleeve and bearing chucks respectively arranged at two ends of the sleeve. Bearings are arranged in the bearing chucks. Inner rings of the bearings are tightly sleeved on the outer wall of the first steel pipe. An end of the bearing chuck near the closed end of the first steel pipe is connected with a motor fixing box. The rotating motor is fixed in the motor fixing box. A rotating shaft of the rotating motor passes through the motor fixing box and is connected with the closed end of the first steel pipe.

[0011] Handles are arranged on both sides of the motor fixing box.

[0012] A flashlight fixing clamp is arranged on the outer wall of the sleeve. A flashlight facing the sleeve member is arranged in the flashlight fixing clamp.

[0013] A fixing block is connected to the closed end of the first steel pipe. The rotating shaft of the rotating motor passes through and is fixed in the middle of the fixing block.

[0014] The number of the first screw holes is two groups. The two groups are respectively arranged on both sides of the first steel pipe. Each group includes two first screw holes arranged on the outer wall of the first steel pipe along the length direction of the first steel pipe. The first threaded holes correspond to the first screw holes one by one.

[0015] The number of the second screw holes is two groups. The two groups are respectively arranged on both sides of the second steel pipe. Each group includes two second screw holes arranged on the outer wall of the second steel pipe along the length direction of the second steel pipe. The second threaded holes correspond to the second screw holes one by one;

[0016] The distance between two second screw holes in each group is the same as the distance between two first screw holes in each group.

[0017] The number of the infrared spotlights is four. Four fixing seats with threaded holes are evenly arranged circumferentially on the outer wall of the third steel pipe. The central axis of the threaded hole is parallel to the central axis of the third steel pipe. Screws are arranged on the lamp housing of the infrared spotlight. The screws are screwed into the corresponding threaded holes.

[0018] On the other hand, a using method of an electric wrench with adjustable length provided by the present invention uses the above-mentioned electric wrench with adjustable length to install nuts, including the following steps:

[0019] S1: According to the design elevation of the nut to be installed, select the number of the extension rods, and sequentially connect the extension rods between the motor driving member and the sleeve member;

[0020] S2: Clamp the nut in the inner hexagon sleeve;

[0021] S3: Adjust the position of the infrared spotlight so that the light of the infrared spotlight is flush with the upper surface of the nut.

[0022] S4: Vertically lift the motor driving member, start the rotating motor, screw the nut onto the lead screw, and stop the installation of the nut when the light of the infrared spotlight is flush with the design elevation.

[0023] As can be seen from the above description, for the length-adjustable electric wrench and its usage method provided by the present invention, the electric wrench includes a motor driving member, an extension rod member, and a socket member that are connected in sequence. Several extension rod members can be selected and connected between the motor driving member and the socket member according to the installation height. The motor driving member can drive the entire wrench to rotate so that the socket member rotates the nut. The light of the infrared spotlight provided on the socket member is adjusted to be flush with the upper surface of the nut, which can assist in observing whether the nut is screwed to the design elevation. The present invention avoids personnel climbing for installation, can make the installation height of the nut reach the accuracy at one time, improves the installation efficiency of the nut, and improves the installation efficiency of high-position components.

[0024] To achieve the above and related purposes, one or more aspects of the present invention include features that will be described in detail later and specifically pointed out in the claims. The following description and the accompanying drawings illustrate certain exemplary aspects of the present invention in detail. However, these aspects only indicate some of the various ways in which the principles of the present invention can be used. In addition, the present invention aims to include all these aspects and their equivalents. Description of the Drawings

[0025] By referring to the content of the following specification in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more obvious and easier to understand. In the drawings:

[0026] Figure 1 Is a cross-sectional view of the length-adjustable electric wrench according to Embodiment 1 of the present invention;

[0027] Figure 2 Is a cross-sectional view of the motor driving member according to Embodiment 1 of the present invention;

[0028] Figure 3 Is a cross-sectional view of the extension rod member according to Embodiment 1 of the present invention;

[0029] Figure 4 Is a cross-sectional view of the socket member according to Embodiment 1 of the present invention;

[0030] Figure 5 Is a top view of the socket member according to Embodiment 1 of the present invention;

[0031] Figure 6Cross-sectional view of the kit according to Embodiment 1 of the present invention;

[0032] Figure 7 Structural schematic diagram of the flashlight fixing clamp according to Embodiment 1 of the present invention;

[0033] Figure 8 Flowchart of the usage method of the length-adjustable electric wrench according to Embodiment 2 of the present invention;

[0034] Wherein, 1 - motor drive member, 11 - first steel pipe, 12 - rotating motor, 13 - first screw hole, 14 - fixed block, 2 - extension rod member, 21 - second steel pipe, 22 - first insertion pipe, 23 - first threaded hole, 24 - second screw hole, 3 - sleeve member, 31 - third steel pipe, 32 - second insertion pipe, 33 - second threaded hole, 34 - hexagon socket, 4 - kit, 41 - sleeve, 42 - bearing groove, 43 - bearing, 44 - motor fixing box, 5 - infrared spotlight, 51 - screw, 6 - fixed seat, 7 - handle, 8 - flashlight fixing clamp, 81 - support column, 82 - arc-shaped clamping plate, 83 - tightening bolt, 9 - flashlight;

[0035] In all the drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed implementation mode

[0036] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is obvious that these embodiments can also be implemented without these specific details. In other examples, well-known structures and devices are shown in block diagram form for the convenience of describing one or more embodiments.

[0037] The present invention can be subjected to various changes and can have various embodiments. Specific embodiments are illustrated in the drawings and described. However, the present invention is not limited to this specific implementation manner, and all changes, equivalents, and alternatives falling within the spirit and technical scope of the present invention should be understood to be included.

[0038] Ordinal terms such as first, second, etc. can be used to describe various components, but the components are not limited to these terms. These terms are only used to distinguish one component from another. For example, without departing from the scope of the claims of the present invention, the second component can be named the first component, and similarly, the first component can also be named the second component. The term and / or includes a combination of multiple related items or one of multiple related items.

[0039] It should be understood that when referring to a certain component being "connected" or "in contact" with other components, this not only includes the case of being directly connected or in contact with other components, but also should be understood to include the case where there are other components in between. Conversely, when referring to a certain component being "directly connected" or "directly in contact" with other components, it should be understood that there are no other components in between.

[0040] In the description of the embodiments, when it is described that a certain component is formed "on or under" another component, "on or under" includes both the case where the two components are in direct contact with each other and the case where at least one other component is disposed between the two components. And when expressed as "on or under", based on a certain component, it not only refers to the upper side direction, but also may include the lower side direction.

[0041] The terms used in this application are only used to describe specific embodiments and do not limit the present invention. Unless otherwise clearly specified in the context, the singular expression includes the plural expression. In this application, it should be understood that terms such as "including" or "having" are used to specify the existence of the features, numbers, steps, operations, components, parts or combinations thereof described in the specification, and do not preclude the existence or additional possibility of one or more other features, numbers, steps, operations, components, parts or combinations thereof in advance.

[0042] Unless otherwise defined, including technical terms or scientific terms, all terms used herein have the same meaning as generally understood by those skilled in the art. Terms defined in commonly used dictionaries should be interpreted to have the meaning consistent with the context of the related technology. If not clearly defined in this application, they cannot be interpreted as ideal or overly formal meanings.

[0043] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] As Figures 1 - 7 Collectively shown, the length-adjustable electric wrench proposed in this embodiment can be used in building projects such as horizontal bridge frames, ventilation ducts, pipelines, and ceilings. A component support nut is installed on the lead screw, and it can also be used for the installation of bolts / nuts at the top positions in other occasions.

[0045] The length-adjustable electric wrench includes a motor driving member 1, an extension rod member 2, and a socket member 3 that are connected in sequence. The motor driving member 1 serves as a power mechanism to drive the entire wrench to rotate for installing nuts; the number of connected extension rod members 2 can be selected according to construction needs so that the socket member 3 can reach the installation height; the socket member 3 is used to rotate the nut. Since the nut is to be installed on a vertical screw at a high position above to support and fix the components on the screw, the length-adjustable electric wrench is used vertically.

[0046] The motor driving member 1 may include a first steel pipe 11 with one end closed and the other end open. At the middle of the closed end of the first steel pipe 11, the rotating shaft of a rotating motor 12 is connected. The rotating motor 12 can drive the first steel pipe 11 to rotate. A first screw hole 13 is provided on the outer wall of the open end of the first steel pipe 11 for connecting the extension rod member 2.

[0047] The extension rod member 2 is connected to the first steel pipe 11 in an inserted connection. The extension rod member 2 may include a second steel pipe 21 and a first insertion pipe 22 connected to one end of the second steel pipe 21. The first insertion pipe 22 is a reduced-diameter pipe of the second steel pipe 21, and the outer diameter of the first insertion pipe 22 is the same as the inner diameter of the first steel pipe 11. A first threaded hole 23 is provided on the first insertion pipe 22. After the first insertion pipe 22 is inserted into the first steel pipe 11, the first threaded hole 23 and the first screw hole 13 are aligned, and they are fastened by screwing a bolt into the first screw hole 13 and the first threaded hole 23 to connect the first steel pipe 11 and the second steel pipe 21 together. A second screw hole 24 is provided at the other end of the second steel pipe 21 for connecting the socket member 3. The extension rod members 2 can be connected in sequence to form electric wrenches of different heights.

[0048] The socket member 3 is connected to the extension rod member 2 in an inserted connection. The socket member 3 may include a third steel pipe 31 and a second insertion pipe 32 connected to one end of the third steel pipe 31. The second insertion pipe 32 is a reduced-diameter pipe of the third steel pipe 31, and the outer diameter of the second insertion pipe 32 is the same as the inner diameter of the second steel pipe 21. A second threaded hole 33 is provided on the second insertion pipe 32. After the second insertion pipe 32 is inserted into the second steel pipe 21, the second threaded hole 33 and the second screw hole 24 are aligned, and they are fastened by screwing a bolt into the second screw hole 24 and the second threaded hole 33 to connect the second steel pipe 21 and the third steel pipe 31 together.

[0049] In order to rotate the nut, an internal hexagonal socket 34 is provided inside the third steel pipe 31. The depth and inner circumferential dimensions of the internal hexagonal socket 34 should be such that it is convenient to clamp the nut so that the nut will not fall off after being clamped into the internal hexagonal socket 34. Socket members 3 with internal hexagonal sleeves of different sizes can be processed to facilitate the installation of different nuts.

[0050] To accurately control the elevation of the nut, an infrared spotlight 5 can be provided on the outer wall of the third steel pipe 31. The light of the infrared spotlight 5 is perpendicular to the central axis of the third steel pipe 31 and intersects it, and the position of the infrared spotlight 5 can be moved along the height direction of the third steel pipe 31. When the electric wrench is vertically lifted, the light emitted by the infrared spotlight 5 is horizontal. According to the upper surface of the nut clamped by the sleeve member 3, the position of the infrared spotlight 5 can be adjusted so that the light is flush with the upper surface of the nut. Then, start the rotation motor 12, and the first steel pipe 11, the second steel pipe 21, and the third steel pipe 31 connecting member rotate, driving the nut in the inner hexagonal sleeve 41 to rotate, so as to screw the nut upward. When the light of the infrared spotlight 5 is flush with the suspended elevation control line, the nut is installed in place, which can avoid secondary adjustment of the nut and the nut is installed in place at one time.

[0051] The number of extension rods 2 can be selected according to the installation elevation. A number of extension rods 2 are connected between the motor drive member 1 and the sleeve member 3, and nuts with different elevation requirements can be installed. The sleeve member 3 can also be directly inserted into the motor drive member 1 to install nuts with a lower installation elevation, and it can also be used as an ordinary wrench.

[0052] In a specific embodiment of the present invention, for the convenience of insertion, the inner diameters of the first steel pipe 11, the second steel pipe 21, and the third steel pipe 31 are the same, and the outer diameters of the first insertion pipe 22 and the second insertion pipe 32 are the same. After the motor drive member 1, the extension rod 2, and the sleeve member 3 are connected, they form an integral pipe fitting, which is convenient for stable rotation. The first steel pipe 11, the second steel pipe 21, and the third steel pipe 31 can be processed from lightweight rigid pipe fittings of the same specification. The heights and specifications of the first steel pipe 11, the second steel pipe 21, and the third steel pipe 31 can be determined according to the specific construction conditions as long as it is convenient for personnel to operate.

[0053] Hole bottom plates are provided at the lower ends of both the first threaded hole 23 and the second threaded hole 33. When the nut on the screw rod of the sleeve member 3 is rotated, the screw rod may enter the interior of the third steel pipe or even the second steel pipe. The first threaded hole 23 on the first insertion pipe 22 and the second threaded hole 33 on the second insertion pipe 32 are not through holes, which can prevent the bolt from horizontally extending into the interior of the third steel pipe / second steel pipe during screw connection, and the bolt will not prevent the screw rod from entering the interior of the third steel pipe / second steel pipe.

[0054] In a specific embodiment of the present invention, in order to achieve stable rotation, a kit 4 is sleeved outside the first steel pipe 11. The kit 4 may include a sleeve 41 and bearing slots 42 respectively provided at both ends of the sleeve 41. The sleeve 41 is a pipe fitting with an inner diameter slightly larger than the outer diameter of the first steel pipe 11. Bearings 43 are provided in the bearing slots 42. The inner diameter of the bearings 43 is adapted to the outer diameter of the first steel pipe 11, and the inner rings of the bearings 43 are tightly sleeved on the outer wall of the first steel pipe 11, so that the first steel pipe 11 can rotate smoothly within the kit 4. Shallow grooves may also be provided along the circumferential direction of the outer wall of the first steel pipe 11 to facilitate the stable rolling of the bearings 43.

[0055] In order for the rotating motor 12 to stably drive the entire wrench to rotate smoothly and steadily within the kit 4, a motor fixing box 44 is connected to the end of the bearing slot 42 near the closed end of the first steel pipe 11. The rotating motor 12 is fixed within the motor fixing box 44, and the rotating shaft of the rotating motor 12 passes through the motor fixing box 44 and is connected to the closed end of the first steel pipe 11. The shaft of the rotating motor 12 is on the center line of the first steel pipe 11, the second steel pipe 21, and the third steel pipe 31. The rotating motor 12 is fixed within the motor fixing box 44 connected by the kit 4 below the first steel pipe 11, forming a vertical integral body with the first steel pipe 11, and powerfully driving the entire wrench to rotate smoothly.

[0056] In a specific embodiment of the present invention, in order to facilitate the holding of this electric wrench, handles 7 are provided on both sides of the motor fixing box 44. Construction workers can hold the handles 7, which is convenient for vertical operation.

[0057] In a specific embodiment of the present invention, in order for the rotating shaft of the rotating motor 12 to drive powerfully, a fixing block 14 is connected to the closed end of the first steel pipe 11. The diameter of the fixing block 14 is the same as the outer diameter of the first steel pipe 11, and the height of the fixing block 14 is basically the same as that of the rotating shaft. The rotating shaft of the rotating motor 12 passes through and is fixed in the middle of the fixing block 14. The connection between the rotating shaft of the rotating motor 12 and the fixing block 14 can increase the connection length of the rotating shaft, thereby driving the first steel pipe 11, the second steel pipe 21, and the third steel pipe 31 connecting member to rotate stably and powerfully.

[0058] In a specific embodiment of the present invention, in order to firmly connect the motor driving member 1 and the extension rod 2, the number of first screw holes 13 on the first steel pipe 11 is two groups, which are respectively provided on both sides of the first steel pipe 11. Each group includes two first screw holes 13 provided on the outer wall of the first steel pipe 11 along the length direction of the first steel pipe 11. The first threaded holes 23 on the first insertion pipe 22 at the front end of the second steel pipe 21 correspond to the first screw holes 13 one by one.

[0059] After the first insertion pipe 22 at the front ends of the first steel pipe 11 and the second steel pipe 21 are inserted and connected, after the corresponding first screw holes and first threaded holes are aligned, they are connected by screwing bolts tightly. There are connection points on both sides of the pipe fittings, and the connection is stable and firm.

[0060] In a specific embodiment of the present invention, in order to firmly connect and stably connect the extension rod member 2 and the sleeve member 3, the number of the second screw holes 24 is two groups, and the two groups are respectively arranged on both sides of the second steel pipe 21. Each group includes two second screw holes 24 arranged on the outer wall of the second steel pipe 21 along the length direction of the second steel pipe 21. The second threaded holes 33 on the second insertion pipe 32 at the front end of the third steel pipe 31 correspond to the second screw holes 24 one by one.

[0061] After the second insertion pipe 32 at the front ends of the second steel pipe 21 and the third steel pipe 31 are inserted and connected, after the corresponding second screw holes and second threaded holes are aligned, they are connected by screwing bolts tightly. There are connection points on both sides of the pipe fittings, and the connection is stable and firm.

[0062] In order for the sleeve member 3 to be directly connected to the motor drive member 1, the distance between the two second screw holes in each group is the same as the distance between the two first screw holes in each group.

[0063] In a specific embodiment of the present invention, in order to accurately align the elevation, four fixing seats 6 with threaded holes are evenly arranged on the outer wall of the third steel pipe 31 in a circle. The central axis of the threaded hole is parallel to the central axis of the third steel pipe 31. Screws 51 are arranged on the outer shell of the infrared spotlight 5, and the screws 51 are screwed into the threaded holes. By screwing the screws 51 on the lamp shell and the fixing seats 6, the height of the infrared spotlight 5 can be adjusted, and the heights of the lights of the four infrared spotlights 5 are adjusted to be flush with the upper surface of the nut clamped in the sleeve. The lights of the four infrared spotlights 5 form a light plane, and this light plane is the position of the upper surface of the nut. When this light plane is aligned with the elevation mark, it means that the nut has reached the elevation, and the rotation of the nut can be stopped.

[0064] By means of the plane formed by the light, observing the position of the upper surface of the nut provides convenience for construction.

[0065] In a specific embodiment of the present invention, in order to further facilitate construction, a flashlight fixing clamp 8 is arranged on the outer wall of the sleeve 41, and a flashlight 9 facing the sleeve member 3 is arranged in the flashlight fixing clamp 8. The flashlight 9 can illuminate upwards, which is convenient for observing the working condition of the sleeve member 3 when the light is insufficient. The flashlight fixing clamp 8 may include a support column 81 vertically connected to the outer wall of the sleeve 41. Two opposite arc-shaped clamping plates 82 are arranged at the upper end of the support column 81. A tightening bolt 83 is screwed in the middle of the arc-shaped clamping plates 82. The handle of the flashlight can be placed between the two arc-shaped clamping plates 82, and the two tightening bolts 83 are used to clamp the handle of the flashlight.

[0066] Embodiment 2

[0067] As Figure 8 shown, the method of using the electric wrench with adjustable length provided in this embodiment installs nuts by using the electric wrench with adjustable length described in Embodiment 1, including the following steps:

[0068] S1: According to the designed elevation of the nut to be installed, select the number of extension rods 2, and connect the extension rods 2 between the motor driving member 1 and the socket member 3 in sequence.

[0069] After the motor driving member 1, the extension rods 2 and the socket member 3 are connected, it should be convenient for construction workers to operate and facilitate screwing the nut onto the top screw rod. The first insertion pipe 22 of the first extension rod 2 is connected to the first steel pipe 11 of the motor driving member 1 by bolts, the first insertion pipe 22 of the subsequent extension rods 2 is connected to the second steel pipe 21 of the previous extension rod 2 by bolts, and the second insertion pipe 32 of the socket member 3 is connected to the second steel pipe 21 of the last extension rod 2 by bolts, making the whole electric wrench stably and firmly connected.

[0070] S2: Snap the nut into the internal hexagonal socket 34.

[0071] After the whole electric wrench is installed, place the nut to be installed into the internal hexagonal socket 34, and keep the nut at the bottom of the internal hexagonal socket 34 to facilitate adjusting the infrared spotlight 5.

[0072] S3: Adjust the position of the infrared spotlight 5 so that the light of the infrared spotlight 5 is flush with the upper surface of the nut.

[0073] Rotate the screw 51 at the lower part of the lamp housing of the infrared spotlight 5 to align the light of the infrared spotlight 5 with the upper surface of the nut. The light of the infrared spotlight 5 can represent the upper surface of the nut, and the position of the nut can be mastered by observing the light during installation.

[0074] S4: Vertically lift the motor driving member 1, start the rotating motor 12, screw the nut onto the screw rod, and stop installing the nut when the light of the infrared spotlight 5 is flush with the designed elevation.

[0075] Start the installation. Align the nut with the screw rod, rotate the motor 12 to drive the whole wrench to rotate, slowly lift the whole wrench while following the rotation of the wrench, and the nut is gradually installed onto the screw rod. Observe that the light of the infrared spotlight 5 is aligned with the elevation control line, indicating that the nut is installed in place. Then stop lifting this wrench, pull out this wrench, and turn off the rotating motor 5.

[0076] The length-adjustable electric wrench according to the present invention and its usage method will be described below by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can also be made to the above-mentioned length-adjustable electric wrench and its usage method proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. An electric wrench with adjustable length, characterized in that, It includes a motor driving member, an extension rod member and a sleeve member connected in sequence, wherein, the motor driving member includes a first steel pipe, a rotating motor is connected to the middle of the closed end of the first steel pipe, and a first screw hole is formed on the outer wall of the open end of the first steel pipe; the extension rod member includes a second steel pipe and a first insertion pipe connected to one end of the second steel pipe. A first threaded hole is provided on the first insertion pipe. The first insertion pipe is inserted into the first steel pipe and fastened by a bolt screwing the first screw hole and the first threaded hole. A second screw hole is provided at the other end of the second steel pipe; the sleeve member includes a third steel pipe and a second insertion pipe connected to one end of the third steel pipe. A second threaded hole is provided on the second insertion pipe. The second insertion pipe is inserted into the second steel pipe and fastened by a bolt screwing the second screw hole and the second threaded hole. An internal hexagonal sleeve is provided inside the third steel pipe; an infrared spotlight is provided on the outer wall of the third steel pipe. The light of the infrared spotlight is perpendicular to and intersects the central axis of the third steel pipe, and the position of the infrared spotlight is adjustable along the height direction of the third steel pipe.

2. The electric wrench with adjustable length according to claim 1, characterized in that, The inner diameters of the first steel pipe, the second steel pipe and the third steel pipe are the same, the outer diameters of the first insertion pipe and the second insertion pipe are the same, and hole bottom plates are provided at the lower ends of the first threaded hole and the second threaded hole.

3. The electric wrench with adjustable length according to claim 1, characterized in that, A kit is sleeved outside the first steel pipe. The kit includes a sleeve and bearing chucks respectively provided at both ends of the sleeve. Bearings are provided in the bearing chucks. The inner rings of the bearings are tightly sleeved on the outer wall of the first steel pipe. A motor fixing box is connected to the end of the bearing chuck near the closed end of the first steel pipe. The rotating motor is fixed in the motor fixing box, and the rotating shaft of the rotating motor passes through the motor fixing box and is connected to the closed end of the first steel pipe.

4. The electric wrench with adjustable length according to claim 3, wherein Handles are provided on both sides of the motor fixing box.

5. The electric wrench with adjustable length according to claim 3, wherein, A flashlight fixing clamp is provided on the outer wall of the sleeve, and a flashlight facing the sleeve member is provided in the flashlight fixing clamp.

6. The electric wrench with adjustable length according to claim 1, wherein A fixing block is connected to the closed end of the first steel pipe, and the rotating shaft of the rotating motor passes through and is fixed in the middle of the fixing block.

7. The electric wrench with adjustable length according to claim 1, characterized in that, The number of the first screw holes is two groups. The two groups of first screw holes are respectively provided on both sides of the first steel pipe. Each group of first screw holes includes two first screw holes provided on the outer wall of the first steel pipe along the length direction of the first steel pipe, and the first threaded hole corresponds to the first screw hole one by one.

8. The adjustable-length electric wrench according to claim 7, wherein, The number of the second screw holes is two groups. The two groups of second screw holes are respectively provided on both sides of the second steel pipe. Each group of second screw holes includes two second screw holes provided on the outer wall of the second steel pipe along the length direction of the second steel pipe, and the second threaded hole corresponds to the second screw hole one by one; The distance between the two second screw holes in each group is the same as the distance between the two first screw holes in each group.

9. The electric wrench with adjustable length according to claim 1, characterized in that, The number of the infrared spotlights is four. Four fixing seats with threaded holes are evenly arranged circumferentially along the outer wall of the third steel pipe. The central axis of the threaded hole is parallel to the central axis of the third steel pipe. Screws are arranged on the lamp housing of the infrared spotlight, and the screws are screwed into the corresponding threaded holes.

10. A method of using an electric wrench with adjustable length, which uses the electric wrench with adjustable length according to any one of claims 1-9 to install nuts, characterized in that, It includes the following steps: S1: According to the designed elevation of the nut to be installed, select the number of the extension rods, and connect the extension rods between the motor driving member and the sleeve member in sequence; S2: Snap the nut into the inner hexagonal sleeve; S3: Adjust the position of the infrared spotlight so that the light of the infrared spotlight is flush with the upper surface of the nut; S4: Vertically lift the motor driving member, start the rotating motor, screw the nut onto the lead screw, and stop installing the nut when the light of the infrared spotlight is flush with the designed elevation.

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