An electric wrench using a torque difference transmission mechanism

Abstract

The present invention provides an electric wrench using a torque difference transmission mechanism, which relates to the field of disassembly equipment and includes: a lifting structure, a rotating structure and a transmission structure, wherein the transmission structure includes a driving gear and a gear transmission group, wherein the gear transmission group includes a first gear, a second gear, a third gear and a transmission gear, wherein the driving gear is meshed with the first gear, wherein the first gear, the second gear and the third gear are sleeved on the same transmission shaft, wherein the transmission gear is arranged below the transmission shaft and is meshed with the third gear, wherein the transmission gear is transmission-connected to a main shaft of the electric wrench; wherein an electromagnetic torque clutch is sleeved on the transmission shaft, wherein the electromagnetic torque clutch is detachably connected to the third gear, wherein in the present invention, the torque of the electric wrench is detected by the electromagnetic torque clutch, thereby realizing quantitative detection of the torque of the bolt, thereby avoiding subjective judgment of the torque size by humans, and facilitating quick judgment by operators.

Description

Technical Field

[0001] The invention relates to the field of disassembly equipment, and in particular to an electric wrench using a torque difference transmission mechanism. Background Art

[0002] In the current rail transit new track laying, track replacement and rail stress relief projects, the distribution and installation of fastener bolts, gaskets and other accessories and the tightening and loosening of fastener bolts are common operating steps.

[0003] In the prior art, most of them use manual tightening or loosening methods, which is time-consuming and labor-intensive and requires a large amount of work. On the basis of the existing methods, someone has developed an electric wrench that can be installed on a vehicle to install and remove bolts and nuts along the track, which is convenient, fast, time-saving and labor-saving.

[0004] The prior art cannot automatically determine whether the electric wrench can legally install the screw to a fixed position. It can only be determined manually based on experience or observation. For example, if the bolt is over-tightened, it is very likely to have a large plastic deformation, thereby reducing the strength of the bolt; and if the bolt is not tightened, the component to be tightened cannot bear the design load, and the component is prone to damage.

[0005] Therefore, there is an urgent need for an electric wrench that can solve the above-mentioned problems in existing products. Summary of the invention

[0006] The present invention provides an electric wrench using a torque difference transmission mechanism, the purpose of which is to solve the problems existing in the above-mentioned electric wrenches.

[0007] In order to achieve the above object, an embodiment of the present invention provides an electric wrench using a torque difference transmission mechanism, comprising:

[0008] The lifting structure comprises a top plate, the top plate is provided with a lead screw passing through the top plate, the lead screw is screwed with a sliding bottom plate, the lower end surface of the sliding bottom plate is provided with an electric wrench, and the lead screw drives the sliding bottom plate to move up and down;

[0009] The rotating structure comprises two parallel side plates, the upper end of each side plate is fixedly connected to the top plate, the bottom end of each side plate is provided with a rotating shaft, at least one rotating shaft is provided with a non-circular gear and a driving gear shaft meshing with the non-circular gear;

[0010] The transmission structure is arranged on the sliding bottom plate, and includes a driving gear and a gear transmission group. The gear transmission group includes a first gear, a second gear, a third gear and a transmission gear. The driving gear is meshed with the first gear. The first gear, the second gear and the third gear are sleeved on the same transmission shaft. The third gear and the transmission gear are bevel gears. The transmission gear is arranged below the transmission shaft and meshed with the third gear. The transmission gear is connected to the main shaft of the electric wrench by transmission.

[0011] An electromagnetic torque clutch is sleeved on the transmission shaft, and the electromagnetic torque clutch is detachably connected to the third gear.

[0012] Preferably, the driving gear includes a first tooth portion and a second tooth portion arranged at the end of the first tooth portion, the first gear is meshed with the first tooth portion, the second gear is meshed with the second tooth portion, the gear diameter of the first gear is smaller than the diameter of the second gear, the diameter of the first tooth portion is larger than the diameter of the second tooth portion, and a first one-way bearing and a second one-way bearing are respectively arranged between the first gear and the transmission shaft and between the second gear and the transmission shaft, and the first one-way bearing and the second one-way bearing rotate in opposite directions.

[0013] Preferably, the lifting structure also includes a middle plate, which is arranged between the top plate and the sliding plate, and the lead screw passes through the middle plate. Guide columns and shock-absorbing columns are staggered on the middle plate, and the upper end of the guide column is fixed to the top plate, and the lower end of the guide column is fixed to the sliding bottom plate. The shock-absorbing column includes a body and a shock-absorbing spring, the upper end of the body is connected to the middle plate, one end of the shock-absorbing spring is connected to the lower end of the body, and the other end is connected to the sliding bottom plate.

[0014] Preferably, the electric wrench includes a shell, a main shaft and a sleeve push rod are arranged in the shell, the main shaft is connected to the third gear transmission, a dual-axis gyroscope is arranged at one end of the sleeve push rod away from the main shaft, and a mounting portion for mounting a screw is arranged at the lower end of the dual-axis gyroscope. An impact assembly is also arranged in the shell, and the impact assembly includes an impact block, a driven impact cylinder and a pressing sleeve, the impact block is arranged on the outer edge of the main shaft, a guide groove is arranged on the outer surface of the main shaft, the guide groove is spirally ascending, a steel ball is arranged in the guide groove, the impact block can move upward along the guide groove under the action of the steel ball, the driven impact cylinder is connected to the main shaft transmission, the sleeve push rod is engaged with the driven impact cylinder, the pressing sleeve is arranged in the impact block, and the outer edge of the pressing sleeve and the inner edge of the impact block are clearance-matched, the inner edge of the pressing sleeve is fixedly connected to the outer edge of the main shaft, and there is a force between the pressing sleeve and the impact block to prevent the two from approaching.

[0015] Preferably, the electric wrench using the torque difference transmission mechanism also includes a bracket, which includes a positioning beam and two parallel cross beams, the positioning beam is arranged on one side of the electric wrench lifting path, a sensor is arranged on the positioning beam, and a bearing for passing the rotating shaft is arranged on the cross beam.

[0016] Preferably, the sleeve push rod is provided with a height positioning element at one end of the dual-axis gyroscope, and the sensor is used to detect the position of the height positioning element.

[0017] Preferably, there are two gear transmission sets, and the two gear transmission sets are meshed with the same driving gear.

[0018] Preferably, the non-circular gear is a semicircular gear.

[0019] Preferably, the third gear is connected to the main shaft via a cycloid pinwheel reduction box.

[0020] Preferably, the sleeve push rod is sleeved in the driven impact cylinder, and the driven impact cylinder is provided with a vertical waist-shaped groove on the side wall. The sleeve push rod is provided with a push rod pin, and the push rod pin is located in the waist-shaped groove and can move up and down in the waist-shaped groove. A driven spring is provided in the driven impact cylinder, and one end of the driven spring abuts against the main shaft, and the other end abuts against the sleeve push rod.

[0021] The above scheme of the present invention has the following beneficial effects:

[0022] In the present invention, the torque of the transmission shaft is detected by an electromagnetic torque clutch, thereby realizing the detection of the torque of the electric wrench, and realizing quantitative detection of the torque of the bolt, thus avoiding subjective judgment of the torque size by humans, being more accurate and precise, and also facilitating operators to make quick judgments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the lifting structure of the present invention;

[0025] Figure 3 is a cross-sectional view of the transmission structure of the present invention;

[0026] Figure 4 is a cross-sectional view of the electric wrench of the present invention;

[0027] Figure 5 It is a partial structural schematic diagram of the present invention when it is installed on a bracket.

[0028] [Description of Reference Numerals]

[0029] 1-lifting structure, 11-top plate, 12-screw, 13-sliding bottom plate, 14-electric wrench, 15-middle plate, 16-guide column, 17-shock-absorbing column, 141-housing, 142-spindle, 143-sleeve push rod, 144-dual-axis gyroscope, 145-mounting part, 146-impact assembly, 1461-impact block, 1462-driven impact cylinder, 1463-pressing sleeve, 1464-guide groove, 1465-steel ball, 147-driven spring, 148-height positioning element, 149-cycloidal pinwheel reducer;

[0030] 2-rotating structure, 21-side plate, 22-rotating shaft, 23-non-circular gear, 24-driving gear shaft;

[0031] 3-transmission structure, 31-driving gear, 32-gear transmission group, 321-first gear, 322-second gear, 323-third gear, 324-transmission gear, 325-transmission shaft, 326-electromagnetic torque clutch, 327-first one-way bearing, 328-second one-way bearing;

[0032] 4- bracket, 41- positioning beam, 42- cross beam, 43- sensor, 44- bearing. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0034] In view of the existing problems, the present invention provides an electric wrench using a torque difference transmission mechanism.

[0035] like Figure 1-5 As shown, an embodiment of the present invention provides an electric wrench using a torque difference transmission mechanism, including a lifting structure 1 for lifting an electric wrench 14; a rotating structure 2 for driving the lifting structure 1 to rotate and thereby driving the electric wrench 14 to rotate; and a transmission structure 3 for driving the electric wrench 14 to work.

[0036] Specifically, the lifting structure 1 includes a top plate 11, a lead screw 12 passing through the top plate 11 is arranged on the top plate 11, a sliding bottom plate 13 is screwed on the lead screw 12, and the sliding bottom plate 13 can be driven by the lead screw 12 to achieve lifting. The lead screw 12 is connected to a lead screw motor (not shown in the figure) in a transmission manner, and the lead screw motor can achieve the lifting and lowering of the sliding bottom plate 13 by forward and reverse rotation.

[0037] Furthermore, the lifting structure 1 also includes a middle plate 15, which is arranged between the top plate 11 and the sliding bottom plate 13. The aforementioned lead screw 12 passes through the middle plate 15, and the middle plate 15 is connected to the lead screw 12. The middle plate 15 and the lead screw 12 are fixed in the longitudinal direction. A guide column 16 and a shock-absorbing column 17 are staggered on the middle plate 15, wherein the upper end of the guide column 16 is fixed to the top plate 11, and the lower end passes through the sliding bottom plate 13 and is fixed to the middle plate 15 by a fixing member to prevent the sliding bottom plate 13 from being separated from the guide column 16 during operation. The aforementioned shock-absorbing column 17 includes a body and a shock-absorbing spring arranged on the body, one end of the shock-absorbing spring is connected to the body, and the other end is connected to the sliding bottom plate 13. In this embodiment, the function of the shock-absorbing column 17 is to prevent the thread misalignment of the screw and the nut due to the lifting structure 1 lifting too fast during the lifting process of the sliding base plate 13. The shock-absorbing column 17 has a buffering force, which can correct the situation where the screw and the nut cannot be aligned to a certain extent, especially when the electric wrench 14 generates vibration during operation, and has a better correction effect.

[0038] The aforementioned rotating structure 2 includes two parallel side plates 21, each side plate 21 clamps the aforementioned top plate 11 between the two side plates 21, and the top end of the side plate 21 is fixedly connected to the top plate 11. A rotating shaft 22 is arranged at the bottom end of the side plate 21. Preferably, the upper part of the side plate 21 is rectangular, and the lower part is an inverted triangle, and the rotating shaft 22 is arranged at the vertex of the inverted triangle. A non-circular gear 23 and a driving gear shaft 24 meshing with the non-circular gear 23 are arranged on at least one rotating shaft 22, and the driving gear shaft 24 is driven by a motor.

[0039] The aforementioned transmission structure 3 is arranged on the sliding base plate 13, and includes a driving gear 31 and a gear transmission group 32, wherein the gear transmission group 32 includes a first gear 321, a second gear 322, a third gear 323 and a transmission gear 324, and the first gear 321, the second gear 322 and the third gear 323 are sleeved on the same transmission shaft 325, and the angular velocity of the three is the same. The driving gear 31 meshes with the first gear 321 and transmits power. The third gear 323 and the transmission gear 324 are both bevel gears, and the transmission gear 324 is arranged below the transmission shaft 325 and meshes with the third gear 323. The driving gear 31 transmits power to the third gear 323 through the transmission shaft 325, and the third gear 323 and the transmission gear 324 change the transmission direction of the force to vertical. The transmission gear 324 is transmission-connected with the main shaft 142 of the electric wrench 14 to realize the transmission rotation of the driving gear 31 to the electric wrench 14.

[0040] An electromagnetic torque clutch 326 is sleeved on the transmission shaft 325, and the electromagnetic torque clutch 326 is detachably connected to the third gear 323. In the present invention, the electromagnetic torque clutch 326 measures the torque of the transmission shaft 325, that is, indirectly measures the torque of the electric wrench 14, and the torque of the bolt can be obtained according to the torque of the electric wrench 14, which solves the problem that the torque of the bolt cannot be measured in the prior art, and can more directly judge whether the installation of the bolt is in compliance with the regulations, avoiding the risk of over-tightening or under-tightening of the screw.

[0041] In an electric wrench using a torque difference transmission mechanism, a bracket 4 is also included. The bracket 4 can be a separate structure or a bracket 4 supported on a carrier. The bracket 4 includes a positioning beam 41 and two parallel beams 42, wherein a bearing 44 that can support the rotating shaft 22 is provided on the beam 42. When the driving gear shaft 24 drives the non-circular gear 23 to rotate, the rotating structure 2 rotates with the bearing 44 as the rotating point, thereby adjusting the direction of the electric wrench 14.

[0042] Preferably, the non-circular gear 23 is a semicircular gear. The angle of the non-circular gear 23 determines the rotation angle of the electric wrench 14. In this embodiment, the electric wrench 14 rotates ninety degrees, that is, from a vertical state to a horizontal state, and stands by to prepare for the next work.

[0043] A sensor 43 is provided on the aforementioned positioning beam 41. Preferably, the positioning beam 41 is provided on one side of the lifting path of the electric wrench 14, so as to facilitate detection of the height of the electric wrench 14.

[0044] The electric wrench 14 comprises a housing 141, in which a sleeve push rod 143 and a main shaft 142 connected to a transmission gear 324 are arranged, a dual-axis gyroscope 144 is arranged at one end of the sleeve push rod 143 away from the main shaft 142, and a mounting portion 145 for mounting a screw is arranged at the lower end of the dual-axis gyroscope 144. In this embodiment, the main shaft 142 is in transmission connection with the sleeve push rod 143, and the sleeve push rod 143 is driven to drive the mounting portion 145 to work.

[0045] Furthermore, in order to avoid thread misalignment of the screw during installation, an impact assembly 146 is also provided in the electric wrench 14, and the impact assembly 146 includes an impact block 1461, a driven impact cylinder 1462 and a pressing sleeve 1463, wherein the impact block 1461 is arranged on the outer edge of the main shaft 142, and the impact block 1461 can move axially of the main shaft 142, and a guide groove 1464 is provided on the outer surface of the main shaft 142, and the guide groove 1464 is spirally ascending. In the present embodiment, there are two guide grooves 1464. A steel ball 1465 is arranged in the guide groove 1464. When the main shaft 142 rotates, the steel ball 1465 pushes the impact block 1461 to move upward. When the impact block 1461 is located at the top of the guide groove 1464, the steel ball 1465 is separated from the impact block 1461, and the steel ball 1465 falls back to the bottom of the guide groove 1464. The impact block 1461 lacks the support of the steel ball 1465 and falls downward under the action of gravity.

[0046] The aforementioned driven impact cylinder 1462 is in transmission connection with the main shaft 142, the sleeve top rod 143 is engaged with the driven impact cylinder 1462, the aforementioned pressing sleeve 1463 is arranged in the impact block 1461, and the outer edge of the pressing sleeve 1463 is in clearance fit with the inner edge of the impact block 1461, and the inner edge of the pressing sleeve 1463 is fixedly connected with the outer edge of the main shaft 142. There is a force between the pressing sleeve 1463 and the impact block 1461 to prevent the two from approaching. The force can be achieved by elastic elements such as springs.

[0047] The sleeve push rod 143 is sleeved in the driven impact cylinder 1462. The driven impact cylinder 1462 is provided with a vertical waist-shaped groove on the side wall. The side wall of the sleeve push rod 143 is provided with a push rod pin. After the driven impact cylinder 1462 and the sleeve push rod 143 are assembled, the push rod pin is located in the waist-shaped groove and can move in the waist-shaped groove. A driven spring 147 is provided in the driven impact cylinder 1462. One end of the driven spring 147 abuts against the main shaft 142, and the other end abuts against the sleeve push rod 143.

[0048] When the impact block 1461 falls, it generates an impact force on the driven impact cylinder 1462, which in turn causes the mounting portion 145 to also receive an impact force. Under the action of the impact force, the screw installed on the mounting portion 145 vibrates to correct the misalignment between the nut and the screw thread. In order to prevent the impact block 1461 from generating an excessive impact force that directly damages the thread, the driven spring 147 can alleviate the impact force and slowly release the impact force through the driven spring 147 to prevent the thread from being damaged.

[0049] In addition, a cycloid pinwheel reducer 149 is provided between the main shaft 142 and the third gear 323 for deceleration, which also slows down the frequency of the impact block 1461 rising along the main shaft 142, and indirectly avoids the impact block 1461 from frequently generating impact force.

[0050] Furthermore, a height positioning element 148 is provided at one end of the sleeve top rod 143 located at the dual-axis gyroscope 144. The height positioning element 148 serves as a trigger condition for the sensor 43, so that the sensor 43 can detect the height of the mounting portion 145. Preferably, the height positioning element 148 is arranged to fit the upper end surface of the mounting portion 145.

[0051] In the present invention, the electromagnetic torque clutch 326 is used to detect the torque of the screw, and the sensor 43 and the height positioning element 148 are used to detect the descent height of the mounting portion 145. Only when the torque and the descent height meet the requirements, is it a compliant installation.

[0052] During the installation process, the impact block 1461 indirectly generates an impact force on the installation portion 145, which helps to impact the screw with thread dislocation to the appropriate position. There is no need to pre-install the nut and screw, which further reduces the workload.

[0053] Considering that when the electric wrench 14 is installed on the bracket 4, the mounting portion 145 needs to adjust its direction in a smaller space so as to align the nut with the screw, a dual-axis gyroscope 144 is used. The dual-axis gyroscope 144 has the characteristics of small size, is more adaptable to a narrow working space, and meets the requirements of different working conditions.

[0054] In an electric wrench using a torque differential transmission mechanism, the transmission structure 3 is further improved, and the improvement lies in that: the aforementioned driving gear 31 includes a first tooth portion and a second tooth portion arranged on the first tooth portion, the first tooth portion is meshed with the aforementioned first gear 321, and the second tooth portion is meshed with the aforementioned second gear 322, the gear diameters of the first gear 321 and the second gear 322 are different, and a first one-way bearing 327 and a second one-way bearing 328 are respectively arranged between the first gear 321 and the transmission shaft 325, and between the second gear 322 and the transmission shaft 325, and the first one-way bearing 327 and the second one-way bearing 328 have opposite rotation directions.

[0055] Preferably, in the present embodiment, two gear transmission groups 32 are provided, and the first gears 321 in the two groups are respectively meshed with the driving gear 31 .

[0056] In this embodiment, the gear diameter of the first gear 321 is smaller than the diameter of the second gear 322, and the diameter of the first tooth portion is larger than the diameter of the second tooth portion. The first one-way bearing 327 can rotate in the reverse direction, and the second one-way bearing 328 can rotate in the forward direction.

[0057] When the driving gear 31 rotates forward, the first one-way bearing 327 drives the transmission shaft 325 to rotate forward. At this time, the second one-way bearing 328 is idle in the forward direction and cannot transmit the transmission to the transmission shaft 325. Since the diameter of the first gear 321 is smaller than the diameter of the second gear 322, the transmission speed of the transmission shaft 325 is faster.

[0058] When the driving gear 31 rotates in the reverse direction, the second one-way bearing 328 drives the transmission shaft 325 to rotate in the reverse direction. At this time, the first one-way bearing 327 is idling in the reverse direction and cannot transmit the transmission to the transmission shaft 325. Since the diameter of the first gear 321 is smaller than the diameter of the second gear 322, the transmission speed of the transmission shaft 325 is slower.

[0059] When the reverse rotation of the driving gear 31 is defined as the loosening direction and the forward rotation of the driving gear 31 is defined as the tightening direction, it can be tightened quickly and loosened slowly, achieving low torque value tightening and high torque value loosening, saving the working time of the electric wrench 14, improving work efficiency, and meeting the operating requirements of the screw during installation and disassembly.

[0060] An electric wrench using a torque differential transmission mechanism also includes a control system, which is used to collect and send instructions, wherein the control system is used to drive the screw motor, the driving gear shaft 24, the driving gear 31, the electromagnetic torque clutch 326, and the sensor 43, and transmit each instruction to the corresponding components.

[0061] The working principle of an electric wrench using a torque differential transmission mechanism is as follows:

[0062] The present invention is fixed to the carrier by the bracket 4, and is moved by the carrier to the nut near the nut that needs to be tightened. At this time, the electric wrench 14 is rotated from the horizontal state to the vertical state by the rotating structure 2, and the lifting structure 1 is adjusted so that the mounting part 145 is located above the nut. The carrier is continued to be moved, and the mounting part 145 is moved above the nut. The dual-axis gyroscope 144 is adjusted to maintain the vertical state, and the screw is installed in the mounting part 145. The control system controls the lifting structure 1 to descend while controlling the transmission structure 3 to tighten. During operation, the sensor 43 detects the height of the height positioning element 148, and the electromagnetic torque clutch 326 detects the torque of the mounting part 145. The impact component 146 generates an impact force on the mounting part 145 at intervals to ensure that the nut and the screw thread are aligned. When the sensor 43 detects that the height positioning element 148 and the electromagnetic torque clutch 326 detects that the torque of the mounting part 145 is compliant, the screw is tightened. When the sensor 43 does not detect that the torque of the height positioning element 148 and / or the electromagnetic torque clutch 326 is not in compliance, the present invention still remains in the working state. During this state, the impact component 146 impacts the nut and bolt to correct the deviation until both are detected to be qualified.

[0063] After the installation is completed, the lead screw 12 reverses to drive the lifting structure 1 to rise, and the mounting portion 145 separates from the screw and rises, quickly raising the electric wrench 14 to prepare for the second continuous installation.

[0064] Since the height of the bolts is the same during the installation process, it is not necessary to put away the electric wrench 14 through the rotating structure 2, and only the lifting structure 1 needs to be adjusted. After all the installations are completed, the electric wrench 14 needs to be put away through the rotating structure 2.

[0065] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electric wrench using a torque differential transmission mechanism, comprising: A lifting structure (1) comprises a top plate (11), the top plate (11) being provided with a lead screw (12) passing through the top plate (11), the lead screw (12) being screwed to a sliding bottom plate (13), the lower end surface of the sliding bottom plate (13) being provided with an electric wrench (14), and the lead screw (12) driving the sliding bottom plate (13) to move up and down; The rotating structure (2) comprises two side plates (21) arranged in parallel, the upper end of each side plate (21) being fixedly connected to the top plate (11), the bottom end of each side plate (21) being provided with a rotating shaft (22), at least one rotating shaft (22) being provided with a non-circular gear (23) and a driving gear shaft (24) meshing with the non-circular gear (23); A transmission structure (3) is arranged on the sliding base plate (13), comprising a driving gear (31) and a gear transmission group (32), wherein the gear transmission group (32) comprises a first gear (321), a second gear (322), a third gear (323) and a transmission gear (324), wherein the driving gear (31) meshes with the first gear (321), the first gear (321), the second gear (322) and the third gear (323) are sleeved on the same transmission shaft (325), the third gear (323) and the transmission gear (324) are bevel gears, the transmission gear (324) is arranged below the transmission shaft (325) and meshes with the third gear (323), and the transmission gear (324) is transmission-connected to a main shaft (142) of the electric wrench (14); The invention is characterized in that: an electromagnetic torque clutch (326) is sleeved on the transmission shaft (325), and the electromagnetic torque clutch (326) is detachably connected to the third gear (323); The driving gear (31) comprises a first tooth portion and a second tooth portion arranged at an end of the first tooth portion, the first gear (321) meshes with the first tooth portion, the second gear (322) meshes with the second tooth portion, the gear diameter of the first gear (321) is smaller than the diameter of the second gear (322), the diameter of the first tooth portion is larger than the diameter of the second tooth portion, a first one-way bearing (327) and a second one-way bearing (328) are respectively arranged between the first gear (321) and the transmission shaft (325), and between the second gear (322) and the transmission shaft (325), the first one-way bearing (327) and the second one-way bearing (328) rotate in opposite directions; The lifting structure (1) further comprises a middle plate (15), wherein the middle plate (15) is arranged between the top plate (11) and the sliding plate, and the lead screw (12) passes through the middle plate (15).

2. The electric wrench using the torque difference transmission mechanism according to claim 1, characterized in that: A guide column (16) and a shock absorbing column (17) are staggeredly arranged on the middle plate (15); the upper end of the guide column (16) is fixed to the top plate (11); the lower end of the guide column (16) is fixed to the sliding bottom plate (13); the shock absorbing column (17) comprises a body and a shock absorbing spring; the upper end of the body is connected to the middle plate (15); one end of the shock absorbing spring is connected to the lower end of the body, and the other end is connected to the sliding bottom plate (13).

3. The electric wrench using the torque difference transmission mechanism according to claim 2, characterized in that: The electric wrench (14) comprises a housing (141), a main shaft (142) and a sleeve push rod (143) are arranged in the housing (141), the main shaft (142) is transmission-connected to a third gear (323), a dual-axis gyroscope (144) is arranged at one end of the sleeve push rod (143) away from the main shaft (142), a mounting portion (145) for mounting a screw rod is arranged at the lower end of the dual-axis gyroscope (144), an impact assembly (146) is also arranged in the housing (141), the impact assembly (146) comprises an impact block (1461), a driven impact cylinder (1462) and a pressing sleeve (1463), the impact block (1461) is arranged around the outer edge of the main shaft (142), and a guide groove is arranged on the outer surface of the main shaft (142). (1464), the guide groove (1464) is in a spiral ascending shape, a steel ball (1465) is arranged in the guide groove (1464), the impact block (1461) can move upward along the guide groove (1464) under the action of the steel ball (1465), the driven impact cylinder (1462) is transmission-connected with the main shaft (142), the sleeve top rod (143) is snap-connected with the driven impact cylinder (1462), the pressing sleeve (1463) is arranged in the impact block (1461), and the outer edge of the pressing sleeve (1463) and the inner edge of the impact block (1461) are clearance-matched, and the inner edge of the pressing sleeve (1463) is fixedly connected to the outer edge of the main shaft (142), and there is a force between the pressing sleeve (1463) and the impact block (1461) to prevent the two from approaching.

4. The electric wrench using the torque difference transmission mechanism according to claim 3 is characterized in that: The electric wrench using the torque difference transmission mechanism further comprises a bracket (4), the bracket (4) comprising a positioning beam (41) and two parallel cross beams (42), the positioning beam (41) being arranged on one side of a lifting path of the electric wrench (14), a sensor (43) being arranged on the positioning beam (41), and a bearing (44) for passing the rotating shaft (22) being arranged on the cross beam (42).

5. The electric wrench using the torque difference transmission mechanism according to claim 4, characterized in that: The sleeve push rod (143) is located at one end of the dual-axis gyroscope (144) and is sleeved with a height positioning element (148); the sensor (43) is used to detect the position of the height positioning element (148).

6. The electric wrench using the torque difference transmission mechanism according to claim 4, characterized in that: The gear transmission groups (32) are two groups, and the two gear transmission groups (32) are meshed with the same driving gear (31).

7. The electric wrench using the torque difference transmission mechanism according to claim 1, characterized in that: The non-circular gear (23) is a semi-circular gear.

8. The electric wrench using the torque difference transmission mechanism according to claim 3, characterized in that: The third gear (323) is connected to the main shaft (142) via a cycloid pinwheel reduction box (149).

9. The electric wrench using the torque difference transmission mechanism according to claim 3, characterized in that: The sleeve push rod (143) is sleeved in the driven impact cylinder (1462), and the driven impact cylinder (1462) is provided with a vertical waist-shaped groove on the side wall. The sleeve push rod (143) is provided with a push rod pin, and the push rod pin is located in the waist-shaped groove and can move up and down in the waist-shaped groove. A driven spring (147) is provided in the driven impact cylinder (1462), and one end of the driven spring (147) is abutted against the main shaft (142), and the other end is abutted against the sleeve push rod (143).

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