Reversing tension device for electric wrench
Patent Information
- Application Number
- CN202611482249.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-22
- Publication Date
- 2026-10-30
AI Technical Summary
[0003]现有技术中，电动扳手用换向装置，其结构固定，只能针对固定工况进行作业，当需要松紧的螺栓位置变化时，而施力部由于结构固定无法伸出而导致距离不够无法与螺栓的头部接触连接，则需要重新更换施力部长度不同的换向装置或者更换不同的套筒，影响松紧效率，无法应对多种工况，增加更换成本
[0020]本发明通过支撑调节组件驱动松紧柱伸缩时调节其中一个第二直齿轮与其中一个第一直齿轮啮合连接，调节松紧柱伸缩的同时保证其中一个第二直齿轮与其中一个第一直齿轮啮合连接，能够对松紧柱的伸出长度进行调节，不需要重新更换施力部长度不同的换向装置或者更换不同的套筒，实现在不同工况下，若未携带合适施力部的换向装置或套筒，则需要重新回去携带浪费大量的时间，从而节约时间，提高松紧效率，能够应对多种工况，避免需要准备多个施力部长度不同的换向装置或者不同长度的套筒，节约更换成本。
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Figure CN123000694A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electric wrench technology, and more specifically to a reversing tightening / loosening device for an electric wrench. Background Technology
[0002] An electric wrench is an electric tool used for tightening and loosening bolts and nuts, and is a tool for tightening high-strength bolts. It is widely used in assembly work in manufacturing industries such as automobiles, tractors, electrical appliances, power machinery, valves, water pumps, and textile machinery. In chemical, cement precasting, and plastic molding operations, it is used for the assembly and disassembly of vacuum tanks, reaction vessels, cement molds, and demolding of threaded plastic parts. It can also be used in railway, bridge, and building engineering for the installation, maintenance, and replacement of structures such as cement sleepers, truss joints, and angle steel scaffolding. When it is necessary to change the rotation direction of the electric wrench, a reversing device is required.
[0003] In existing technologies, the reversing device in electric wrenches has a fixed structure and can only operate under fixed working conditions. When the position of the bolt to be tightened or loosened changes, the force-applying part cannot extend due to the fixed structure, resulting in insufficient distance to contact the bolt head. This necessitates replacing the reversing device with one of different force-applying part lengths or using a different socket, affecting tightening efficiency, failing to handle various working conditions, and increasing replacement costs. There is an urgent need for a reversing tightening / loosening device for electric wrenches to solve the aforementioned problems. Summary of the Invention
[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a reversing tensioning device for electric wrenches to solve the problems mentioned in the background art. The invention has a reasonable structure, high tensioning efficiency, and low replacement cost.
[0005] To achieve the above objectives, the present invention provides a reversing tightening / loosening device for an electric wrench, comprising:
[0006] The housing has a connecting shaft rotatably disposed inside its top and connected to an electric wrench. The bottom of the connecting shaft is provided with a first helical gear located inside the housing. A second helical gear meshes with the side wall of the first helical gear. The end of the second helical gear is provided with a connecting shaft rotatably connected to the inner wall of the housing. A pair of first spur gears are provided on the side wall of the connecting shaft. A tightening pin is rotatably disposed inside the housing, passing through one side wall and connected to the head of the bolt to be tightened. A pair of second spur gears are provided on the side wall of the tightening pin located inside the housing. The second spur gears are located below the first spur gears.
[0007] The housing is provided with a support adjustment assembly for driving the tension column to extend and retract and adjusting the meshing connection between one of the second spur gears and one of the first spur gears.
[0008] Furthermore, the connecting shaft includes a rotating shaft rotatably disposed inside the housing and extending through its top, the top of the rotating shaft protruding from the top of the housing and provided with a connecting block, the top of the connecting block having a connecting groove for connecting with the output shaft of the electric wrench, and the first helical gear being disposed at the bottom of the rotating shaft.
[0009] Furthermore, a first bearing is provided at the connection between the rotating shaft and the housing, and a second bearing is provided at the connection between the connecting shaft and the housing.
[0010] Furthermore, the tightening post includes a guide post rotatably disposed inside the housing and penetrating one side wall therethrough. A connecting block is provided at one end of the guide post away from the inside of the housing, and a positioning groove is provided at one end of the connecting block away from the guide post to connect with the head of the bolt to be tightened.
[0011] The guide column is rotatably mounted on the support adjustment assembly.
[0012] Furthermore, the positioning groove is provided with a sleeve that connects to the head of the bolt to be tightened or loosened.
[0013] Furthermore, the support adjustment assembly includes a slide rail disposed on the lower side of the inner wall of the housing, a mounting seat disposed on the top of the slider of the slide rail, a guide post penetrating the side wall of the mounting seat, a fourth bearing disposed at the connection between the guide post and the mounting seat, a threaded post penetrating the side wall of the mounting seat and located below the second spur gear, a third bearing disposed at the connection between both ends of the threaded post and the inner wall of the housing, a force-applying rod disposed on the side wall of the housing and connected to the end of the threaded post, and a pair of second spur gears disposed on the side wall of the guide post and located on opposite sides of the mounting seat.
[0014] Furthermore, extension plates are provided on both opposite side walls of the mounting base, the lower end face of the extension plate is flush with the lower end face of the mounting base, and mounting bolts are provided at the connection between the extension plate and the slider of the slide rail.
[0015] Furthermore, the inner wall of the housing is provided with a pair of limiting posts that penetrate the side wall of the mounting base, and the pair of limiting posts are parallel to each other with the threaded post.
[0016] Furthermore, the side wall of the force-applying rod is provided with external threads, the side wall of the housing is provided with a through hole that communicates with the end of the threaded post and is used to avoid the external threads, and the side wall of the threaded post is provided with a locking nut located on the outside of the housing.
[0017] Furthermore, the first helical gear and the second helical gear are located between a pair of first spur gears, and the pair of second spur gears are located between a pair of first spur gears;
[0018] When one of the first spur gears meshes with one of the second spur gears, the other first spur gear does not contact the other second spur gear, and the thickness of the first spur gear is greater than the thickness of the second spur gear.
[0019] Beneficial effects:
[0020] This invention adjusts the engagement between one of the second spur gears and one of the first spur gears when the tensioning column extends or retracts via a support adjustment component. This ensures that the extension length of the tensioning column can be adjusted simultaneously with the engagement of the second spur gear and the first spur gear. This eliminates the need to replace reversing devices with different force-applying parts or different sleeves under various working conditions. If a suitable force-applying reversing device or sleeve is not readily available, it would waste considerable time and effort, thus saving time and improving tensioning efficiency. This invention can handle various working conditions and avoids the need to prepare multiple reversing devices with different force-applying parts or sleeves of different lengths, saving replacement costs.
[0021] By connecting the electric wrench to the connecting shaft, the operation of the electric wrench drives the connecting shaft to rotate, which in turn drives the first helical gear to rotate. The first helical gear drives the second helical gear to rotate, which in turn drives the connecting shaft to rotate. The connecting shaft then drives a pair of first spur gears to rotate, with one of the first spur gears meshing with one of the second spur gears, thus rotating the tensioning column. This allows for operation in confined spaces. The first and second helical gears enable a 90° reversal of the electric wrench's output torque, changing the lateral output torque at the output end. The electric wrench can be used without needing to extend into the work area, or it can be used from the outside. Attached Figure Description
[0022] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0023] Figure 1 This is a schematic diagram of a reversing tensioning device for an electric wrench according to an embodiment of the present invention;
[0024] Figure 2 This is a left view of the mounting base in a reversing tensioning device for an electric wrench according to an embodiment of the present invention;
[0025] Figure 3 According to an embodiment of the present invention Figure 1 A magnified view of A in the middle.
[0026] The components are as follows: 1. Housing; 2. Connecting shaft; 21. Rotating shaft; 22. Connecting block; 221. Connecting groove; 3. First bearing; 4. First helical gear; 5. Second helical gear; 6. First spur gear; 7. Connecting shaft; 71. Second bearing; 8. Second spur gear; 9. Tensioning post; 91. Guide post; 92. Connecting block; 921. Positioning groove; 10. Sleeve; 11. Support adjustment assembly; 111. Third bearing; 112. Threaded post; 113. Mounting base; 1131. Extension plate; 114. Fourth bearing; 115. Slide rail; 116. Mounting bolt; 117. Force rod; 12. Limiting post; 13. Through hole; 14. Locking nut.
[0027] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation
[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.
[0029] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments 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. Therefore, they should not be construed as limitations on the embodiments.
[0030] like Figure 1 As shown, an embodiment of the present invention provides a reversing tightening / loosening device for an electric wrench, comprising:
[0031] The housing 1 has a connecting shaft 2 rotatably installed inside the housing 1, which passes through its top and is connected to an electric wrench. The bottom of the connecting shaft 2 is provided with a first helical gear 4 located inside the housing 1. A second helical gear 5 meshes with the side wall of the first helical gear 4. The end of the second helical gear 5 is provided with a connecting shaft 7 rotatably connected to the inner wall of the housing 1. A pair of first spur gears 6 are provided on the side wall of the connecting shaft 7. A tightening pin 9 is rotatably installed inside the housing 1, which passes through one side wall and is connected to the head of the bolt to be tightened or loosened. A pair of second spur gears 8 are provided on the side wall of the tightening pin 9 located inside the housing 1. The second spur gears 8 are located below the first spur gears 6.
[0032] The housing 1 contains a support adjustment assembly 11 for driving the extension and retraction of the tensioning column 9 and adjusting the meshing connection between one of the second spur gears 8 and one of the first spur gears 6. This design adjusts the meshing connection between one of the second spur gears 8 and one of the first spur gears 6 while the tensioning column 9 is being extended and retracted via the support adjustment assembly 11. This ensures that the extension length of the tensioning column 9 can be adjusted without needing to replace the reversing device with a different force-applying part length or a different sleeve 10. This saves time and improves tensioning efficiency, as it avoids the need to prepare multiple reversing devices or sleeves of different lengths if a suitable force-applying part is not carried, thus preventing the waste of time in different working conditions. It can handle various working conditions and avoids the need to prepare multiple reversing devices with different force-applying part lengths or sleeves of different lengths. 10. Save on replacement costs; When the extension position of the tensioning column 9 is adjusted to the appropriate extension length, connect the electric wrench to the connecting shaft 2. The operation of the electric wrench drives the connecting shaft 2 to rotate, which in turn drives the first helical gear 4 to rotate, which in turn drives the second helical gear 5 to rotate, which in turn drives the connecting shaft 7 to rotate, which in turn drives a pair of first spur gears 6 to rotate. One of the first spur gears 6 meshes with one of the second spur gears 8, which in turn drives the tensioning column 9 to rotate. This allows for operation in confined spaces. The first helical gear 4 and the second helical gear 5 can achieve a 90° rotation of the electric wrench's output torque, changing the lateral output torque at the output end. The electric wrench does not need to be inserted into the work area, or it can be used from the outside.
[0033] Reference Figure 1 The connecting shaft 2 includes a rotating shaft 21 rotatably disposed inside the housing 1 and extending through its top. The top of the rotating shaft 21 protrudes from the top of the housing 1 and is provided with a connecting block 22. The top of the connecting block 22 has a connecting groove 221 for connecting with the output shaft of the electric wrench. The first helical gear 4 is disposed at the bottom of the rotating shaft 21. This design connects the connecting groove 221 on the connecting block 22 in the connecting column with the output shaft of the electric wrench, facilitating the output shaft of the electric wrench to drive the connecting block 22 to rotate. The rotation of the connecting block 22 drives the rotating shaft 21 to rotate, and the rotating shaft 21 drives the first helical gear 4 to rotate, facilitating the driving of the first helical gear 4 to rotate. The shape of the connecting block 22 can be square, cylindrical, etc.
[0034] Reference Figure 1 A first bearing 3 is provided at the connection between the rotating shaft 21 and the housing 1, and a second bearing 71 is provided at the connection between the connecting shaft 7 and the housing 1. This design improves the rotational stability of the connections between the rotating shaft 21 and the connecting shaft 7 and the housing 1 through the first bearing 3 and the second bearing 71.
[0035] Reference Figure 1The tightening column 9 includes a guide column 91 that is rotatably disposed inside the housing 1 and penetrates one side wall therein. A connecting block 92 is provided at one end of the guide column 91 away from the inside of the housing 1. A positioning groove 921 is provided at one end of the connecting block 92 away from the guide column 91 to connect with the head of the bolt to be tightened.
[0036] The guide post 91 is rotatably mounted on the support adjustment assembly 11. This design, by having the guide post 91 in the tensioning post 9 rotatably mounted on the support adjustment assembly 11, facilitates the adjustment of one of the second spur gears 8 and one of the first spur gears 6 when the support adjustment assembly 11 drives the tensioning post 9 to extend or retract. This ensures that one of the second spur gears 8 and one of the first spur gears 6 are engaged simultaneously, thereby adjusting the extension length of the tensioning post 9. A through guide hole is provided on the side wall of the housing 1, and the guide post 91 is located inside the guide hole, improving the stability of the guide post 91's extension and retraction.
[0037] Reference Figure 1 The positioning groove 921 contains a sleeve 10 that connects to the head of the bolt to be tightened or loosened. This design allows the positioning groove 921 to connect with the sleeve 10, which is used to tighten or loosen the head of the bolt, thus achieving a compatible connection with the sleeve 10 and offering high versatility.
[0038] Reference Figure 1 and Figure 2The support adjustment assembly 11 includes a slide rail 115 disposed on the lower side of the inner wall of the housing 1. A mounting base 113 is disposed on the top of the slider of the slide rail 115. A guide post 91 penetrates the side wall of the mounting base 113. A fourth bearing 114 is disposed at the connection between the guide post 91 and the mounting base 113. A threaded post 112 located below the second spur gear 8 is disposed through the side wall of the mounting base 113. A third bearing 111 is disposed at the connection between both ends of the threaded post 112 and the inner wall of the housing 1. A force-applying rod 117 connected to the end of the threaded post 112 is disposed on the side wall of the housing 1. A pair of second spur gears 8 are disposed on the side wall of the guide post 91 and located on opposite sides of the mounting base 113. This design improves the stability of the lateral movement of the mounting base 113 by connecting the slider of the slide rail 115 in the support adjustment assembly 11 to the mounting base 113. The movement of the mounting base 113 drives the guide column 91 to move laterally, thus supporting the movement of the guide column 91 and enabling it to extend and retract. The fourth bearing 114 at the connection between the mounting base 113 and the guide column 91 improves the stability of the rotation of the guide column 91, allowing the guide column 91 to both extend and retract and rotate, thus improving the stability of the extension and rotation of the guide column 91. The force rod 117 drives the threaded column 112 to rotate. The threaded column 112 rotates and connects to the mounting base 113 by thread. Under the limiting action of the slider of the slide rail 115, it drives the mounting base 113 to move laterally, facilitating the lateral movement of the guide column 91 to achieve the extension and retraction adjustment of the guide column 91. It drives the connecting block 92 to move to a suitable extension position and connect with the head of the bolt to be tightened or loosened, thus achieving the tightening or loosening of the bolt. The shape of the connecting block 92 can be square, cylindrical, etc.
[0039] Reference Figure 1 and Figure 3 On both opposite side walls of the mounting base 113, extension plates 1131 are provided. The lower end face of the extension plate 1131 is flush with the lower end face of the mounting base 113. A mounting bolt 116 is provided at the connection between the extension plate 1131 and the slider of the slide rail 115. This design, through the mounting bolt 116 and the extension plate 1131, and the top of the slider of the slide rail 115 having a threaded hole that matches the stud of the mounting bolt 116, facilitates the installation and fixing connection between the mounting base 113 and the slider of the slide rail 115.
[0040] Reference Figure 1 and Figure 3 The inner wall of the housing 1 is provided with a pair of limiting posts 12 that penetrate the side wall of the mounting base 113, and the pair of limiting posts 12 are parallel to each other with the threaded posts 112. This design guides and limits the lateral movement of the mounting base 113 through the limiting posts 12, thereby further improving the stability of the lateral movement of the mounting base 113.
[0041] Reference Figure 3The force-applying rod 117 has an external thread on its side wall, and the housing 1 has a through hole 13 on its side wall that is connected to the end of the threaded post 112 and is used to avoid the external thread. The threaded post 112 has a locking nut 14 on its side wall located outside the housing 1. This design avoids the external thread on the side wall of the threaded post 112 through the through hole 13, without affecting the rotation of the force-applying rod 117, facilitating the rotation of the threaded post 112 driven by the force-applying rod 117. The locking nut 14 is threadedly connected to the external thread on the side wall of the force-applying rod 117, and the end of the locking nut 14 is in contact with the side wall of the housing 1, thereby locking the position of the threaded post 112. The guide post 91 is locked after adjusting its telescopic position, improving the stability of the connection between the first spur gear 6 and the second spur gear 8. The end of the force-applying rod 117 away from the housing 1 is a disc structure with a diameter larger than that of the external thread, facilitating the rotation of the force-applying rod 117 through the disc. The inner diameter of the through hole 13 is smaller than that of the threaded post 112, and the side wall of the threaded post 112 is smooth at the connection with the third bearing 111, facilitating the connection between the third bearing 111 and the threaded post 112.
[0042] Reference Figure 1 The first helical gear 4 and the second helical gear 5 are located between a pair of first spur gears 6, and a pair of second spur gears 8 are located between a pair of first spur gears 6;
[0043] When one of the first spur gears 6 meshes with one of the second spur gears 8, the other first spur gear 6 and the other second spur gear 8 do not contact each other, and the thickness of the first spur gear 6 is greater than the thickness of the second spur gear 8. This design, through a pair of first spur gears 6 and a pair of second spur gears 8, where one of the first spur gears 6 meshes with one of the second spur gears 8, the other first spur gear 6 and the other second spur gear 8 do not contact each other, and the thickness of the first spur gear 6 is greater than the thickness of the second spur gear 8, enables the adjustment of the telescopic position of the first spur gear 6 and the second spur gear 8 on one side inside the housing 1, and further extension and adjustment of the telescopic position through the first spur gear 6 and the second spur gear 8 on the other side inside the housing 1, thereby increasing the telescopic adjustment range of the guide post 91 in the tensioning post 9.
[0044] Reference Figures 1-3As an embodiment of the present invention: when it is necessary to adjust the length of the force-applying part of the reversing device, the threaded column 112 is rotated by applying force to the force-applying rod 117 in the support adjustment assembly 11. The threaded column 112 rotates and is threadedly connected to the mounting base 113. Under the guiding and limiting action of the slider of the slide rail 115 on the mounting base 113, the threaded column 112 drives the mounting base 113 to move laterally. The movement of the mounting base 113 drives the guide column 91 on the tensioning column 9 to move laterally. The movement of the guide column 91 drives the connecting block 92 on it to move laterally. The connecting block 92 moves and adjusts to a suitable extended position connected to the head of the bolt to be tightened or connected to the sleeve 10. When the sleeve 10 is adjusted to a suitable extended position connected to the head of the bolt to be tightened, the tensioning column is driven. When the tensioning column 9 moves and extends, one of the second spur gears 8 meshes with one of the first spur gears 6. Since the thickness of the first spur gear 6 is greater than that of the second spur gear 8, while adjusting the extension and retraction of the tensioning column 9, it ensures that one of the second spur gears 8 meshes with one of the first spur gears 6. This allows for adjustment of the extension length of the tensioning column 9 without the need to replace the reversing device with a different force-applying part length or a different sleeve 10. This saves time and improves tensioning efficiency, as it can handle various working conditions and avoids the need to prepare multiple reversing devices with different force-applying parts lengths or sleeves 10 of different lengths, thus saving replacement costs.
[0045] When the extension position of the tensioning column 9 is adjusted to the appropriate extension length, the electric wrench is connected to the connecting shaft 2. By holding the housing 1 and the electric wrench, the electric wrench drives the connecting shaft 2 to rotate. The connecting shaft 2 drives the first helical gear 4 to rotate, the first helical gear 4 drives the second helical gear 5 to rotate, the second helical gear 5 drives the connecting shaft 7 to rotate, and the connecting shaft 7 drives a pair of first spur gears 6 to rotate. One of the first spur gears 6 meshes with one of the second spur gears 8, causing the tensioning column 9 to rotate under the action of the fourth bearing 114 inside the mounting base 113. This allows for operation in confined spaces. The first helical gear 4 and the second helical gear 5 achieve a 90° rotation of the electric wrench's output torque, changing the lateral output torque at the output end. The electric wrench does not need to be inserted into the work area, or it can be used from the outside.
[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0047] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.
Claims
1. A reversing tensioning device for an electric wrench, characterized in that, include: A housing (1) has a connecting shaft (2) rotatably disposed inside the housing (1) and connected to an electric wrench. The bottom of the connecting shaft (2) is provided with a first helical gear (4) located inside the housing (1). A second helical gear (5) meshes with the side wall of the first helical gear (4). The end of the second helical gear (5) is provided with a connecting shaft (7) rotatably connected to the inner wall of the housing (1). A pair of first spur gears (6) are provided on the side wall of the connecting shaft (7). A tightening column (9) rotatably disposed inside the housing (1) and connected to the head of the bolt to be tightened or loosened is provided inside the housing (1). A pair of second spur gears (8) are provided on the side wall of the tightening column (9) located inside the housing (1). The second spur gears (8) are located below the first spur gears (6). The housing (1) is provided with a support adjustment assembly (11) for driving the tensioning column (9) to extend and retract and for adjusting the meshing connection between one of the second spur gears (8) and one of the first spur gears (6).
2. The reversing tensioning device for an electric wrench according to claim 1, characterized in that, The connecting shaft (2) includes a rotating shaft (21) that is rotatably disposed inside the housing (1) and extends through its top. The top of the rotating shaft (21) protrudes from the top of the housing (1) and is provided with a connecting block (22). The top of the connecting block (22) is provided with a connecting groove (221) that connects to the output shaft of the electric wrench. The first helical gear (4) is disposed at the bottom of the rotating shaft (21).
3. The reversing tensioning device for an electric wrench according to claim 2, characterized in that, A first bearing (3) is provided at the connection between the rotating shaft (21) and the housing (1), and a second bearing (71) is provided at the connection between the connecting shaft (7) and the housing (1).
4. The reversing tensioning device for an electric wrench according to claim 1, characterized in that, The tightening post (9) includes a guide post (91) rotatably disposed inside the housing (1) and penetrating one side wall therein. A connecting block (92) is provided at one end of the guide post (91) away from the inside of the housing (1). A positioning groove (921) is provided at one end of the connecting block (92) away from the guide post (91) to connect with the head of the bolt to be tightened. The guide post (91) is rotatably mounted on the support adjustment assembly (11).
5. The reversing tensioning device for an electric wrench according to claim 4, characterized in that, The positioning groove (921) is provided with a sleeve (10) that is connected to the head of the bolt to be tightened or loosened.
6. The reversing tensioning device for an electric wrench according to claim 4, characterized in that, The support adjustment assembly (11) includes a slide rail (115) disposed on the lower side of the inner wall of the housing (1). A mounting seat (113) is provided on the top of the slider of the slide rail (115). The guide post (91) passes through the side wall of the mounting seat (113). A fourth bearing (114) is provided at the connection between the guide post (91) and the mounting seat (113). A threaded post (112) located below the second spur gear (8) passes through the side wall of the mounting seat (113). A third bearing (111) is provided at the connection between both ends of the threaded post (112) and the inner wall of the housing (1). A force-applying rod (117) connected to the end of the threaded post (112) is provided on the side wall of the housing (1). A pair of second spur gears (8) are disposed on the side wall of the guide post (91) and located on opposite sides of the mounting seat (113).
7. The reversing tensioning device for an electric wrench according to claim 6, characterized in that, Extension plates (1131) are provided on both opposite side walls of the mounting base (113). The lower end face of the extension plate (1131) is flush with the lower end face of the mounting base (113). Mounting bolts (116) are provided at the connection between the extension plate (1131) and the slider of the slide rail (115).
8. The reversing tensioning device for an electric wrench according to claim 6, characterized in that, The inner wall of the housing (1) is provided with a pair of limiting posts (12) that penetrate the side wall of the mounting base (113), and the pair of limiting posts (12) are parallel to each other with the threaded post (112).
9. The reversing tensioning device for an electric wrench according to claim 6, characterized in that, The force-applying rod (117) has an external thread on its side wall, and the housing (1) has a through hole (13) on its side wall that is connected to the end of the threaded post (112) and is used to avoid the external thread. The threaded post (112) has a locking nut (14) on its side wall located outside the housing (1).
10. The reversing tensioning device for an electric wrench according to claim 1, characterized in that, The first helical gear (4) and the second helical gear (5) are located between a pair of first spur gears (6), and a pair of second spur gears (8) are located between a pair of first spur gears (6); When one of the first spur gears (6) meshes with one of the second spur gears (8), the other first spur gear (6) does not contact the other second spur gear (8), and the thickness of the first spur gear (6) is greater than the thickness of the second spur gear (8).