An electro-hydraulic hybrid open-end wrench

Abstract

The present invention discloses an electro-hydraulic hybrid open-end wrench, comprising a main tong, a back-up tong and a connecting column, wherein the main tong comprises a hydraulic motor-open-end gear set mechanism, a cylinder-ratchet mechanism, a clamping mechanism and a reset mechanism; the back-up tong comprises a cylinder-centering clamping mechanism and a controller; the connecting column is three hollow columns for connecting the main back-up tong to transmit torque, and in addition, the three hollow columns are respectively equipped with a reduction motor and two micro motor pumps to provide energy and power for the actuator in the main back-up tong; when working, the open-end gear set is driven by the reduction motor to drive the open-end gear to rotate continuously to complete the fast buckling process of the rotating workpiece; the main tong oil cylinder is driven by a motor pump to drive the ratchet mechanism to rotate intermittently to complete the buckling process of the rotating workpiece; the back-up tong oil cylinder is driven by another motor pump to drive the centering clamping mechanism to clamp and fix the workpiece. The wrench of the present invention can quickly complete the thread tightening of the rotating workpiece, and the overall structure is highly integrated, which is suitable for most threaded connection conditions.

Description

Technical Field

[0001] The invention relates to an open-end wrench, in particular to an electro-hydraulic hybrid open-end wrench. Background Art

[0002] Threaded connections are widely used in modern industry, construction and other industries because of their reliability, convenience and detachability. However, various threaded workpieces have different shapes and lengths, and the operating environment conditions are also relatively complex. The existing hydraulic wrenches are closed-end, suitable for regular edge shapes, and have slow tightening speeds. They require a firm fixed support to provide a counter-torque, so their use scenarios are greatly limited. The tightening of threads can be divided into two processes, the make-up process that requires a small torque but a long rotation stroke, and the tightening process that requires a large torque but a short rotation stroke. In order to solve the above problems, it is necessary to develop a highly integrated, portable electro-hydraulic hybrid open-end wrench with a reaction force support to ensure that the thread tightening is completed quickly while meeting the tightening torque. Summary of the invention

[0003] The object of the present invention is to provide an electro-hydraulic hybrid open-end wrench, which can quickly complete thread tightening of a rotating workpiece, has a highly integrated overall structure, and is suitable for most threaded connection working conditions.

[0004] The technical scheme for achieving the purpose of the present invention is: an electro-hydraulic hybrid open-end wrench, comprising a main tong, a connecting column and a backup tong, wherein the main tong and the backup tong are fixedly mounted at both ends of the connecting column, and the connecting column is used to connect the main tong and the backup tong and transmit the torque between the two; the main tong comprises a hydraulic motor-open gear set mechanism, a cylinder-ratchet pawl mechanism, a clamping mechanism and a reset mechanism, and the backup tong comprises a cylinder-centering clamping mechanism and a controller;

[0005] The hydraulic motor-open gear set mechanism includes a motor and an open gear set, and the open gear set includes a driving wheel, two idler wheels and an open gear, which is used to complete the buckling process; the oil cylinder-ratchet pawl mechanism includes a main pliers oil cylinder, a pawl, a support block and an open ratchet, which is used to complete the tightening process; the hydraulic motor-open gear set mechanism and the hydraulic cylinder-ratchet pawl mechanism are integrated in the main pliers housing; the clamping mechanism is located between the open gear and the open ratchet, and is driven by the open gear set or the ratchet to drive the clamped workpiece to achieve rotational tightening; the reset mechanism is used to align the open gear and the open ratchet with the opening position of the main pliers housing when the wrench is reset;

[0006] The oil cylinder-centering clamping mechanism is used for clamping and fixing the workpiece, and the controller is used for automatic process control and system status monitoring. The oil cylinder-centering clamping mechanism and the controller are integrated in the back-up clamp housing.

[0007] Furthermore, the cylinder-centering clamping mechanism includes a back-up clamp cylinder, a trapezoidal slider, two back-up clamp connecting rods arranged symmetrically on the left and right, two V-shaped clamps and a return spring. The back-up clamp cylinder is connected to the trapezoidal slider for pushing the trapezoidal slider forward. The two sides of the trapezoidal slider are respectively connected to one end of the two back-up clamp connecting rods for driving the back-up clamp connecting rods. The other end of the back-up clamp connecting rod is connected to the V-shaped clamp. The V-shaped clamp moves toward the center with the back-up clamp connecting rod to achieve centering clamping of the fixed workpiece. The V-shaped clamp is also connected to one end of the return spring, which is fixed on the back-up clamp, and the V-shaped clamp is pulled to move to both sides by the return spring.

[0008] Furthermore, the back-up clamp oil cylinder is installed on the central axis of the back-up clamp opening.

[0009] Furthermore, a reduction motor, a first micro motor pump and a second micro motor pump are provided in the connecting column. The first micro motor pump is connected to the main tongs oil cylinder, and the second micro motor pump is connected to the backup tongs oil cylinder.

[0010] Furthermore, the reduction motor includes a DC motor and a reducer, the first micro motor pump and the second micro motor pump both include a DC motor, a reducer and an axial piston pump, the oil outlet pressure of the axial piston pump meets the workpiece tightening torque requirement after being converted through the cylinder-ratchet pawl mechanism, and the DC motor, reducer and axial piston pump are slender structures.

[0011] Furthermore, the reset mechanism is composed of a permanent magnet fixed on the open gear and a Hall sensor fixed on the main pliers housing. When the wrench is reset, when the permanent magnet and the Hall sensor are aligned, the Hall sensor is triggered to determine that the open gear is aligned with the opening position of the main pliers housing.

[0012] Furthermore, an automatic reversing valve is installed on one side of the master caliper cylinder to control the reversing of the extension and retraction of the master caliper cylinder. A spring booster oil tank is arranged on the side of the master caliper housing opposite to the master caliper cylinder. The spring booster oil tank includes a tank piston, a booster spring and a tank cover plate to provide pressurized hydraulic oil for the first micro motor pump.

[0013] Furthermore, the clamping mechanism is connected with the open gear and the open ratchet through a stepped pin to form an open gear train; the upper side of the open ratchet and the lower side of the open gear each have a step surface, and the axial and radial positioning of the main pliers is achieved by cooperating with the corresponding upper and lower step surfaces of the main pliers housing through the open right-angle annular sliding bearing.

[0014] Furthermore, the connecting columns are three hollow columns, which are distributed in a triangular shape and are respectively located below the driving wheel, the main pliers cylinder and the spring booster tank; the hollow column below the driving wheel has a built-in reduction motor, and the two hollow columns below the main pliers cylinder and the spring booster tank have a first micro motor pump and a second micro motor pump respectively built in, wherein the connecting columns on both sides can be used as grip handles for the electro-hydraulic hybrid open-end wrench, and a control button is arranged on the right hollow column.

[0015] Furthermore, the connecting column is an integrated structure with the main tong housing and the backup tong housing to form a wrench housing, and an upper cover plate and a lower cover plate are fixedly mounted on the upper and lower ends of the wrench housing respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) Opening form: the overall structure adopts an opening form, which is convenient for workpiece insertion and withdrawal and has a wide range of applications;

[0018] 2) Main and back-up tongs structure: the main tongs are used to clamp the rotating workpiece to tighten the thread, and the back-up tongs are used to clamp the fixed workpiece to transmit the tightening counter torque, and the two are connected by a connecting column;

[0019] 3) Integration: The main tongs are integrated with the actuators and spring pressurized oil tanks including the hydraulic motor-open gear set mechanism for make-up and the cylinder-ratchet pawl mechanism for tightening. The connecting column is integrated with the reduction motor and two sets of micro motor pumps. The backup tongs are integrated with the centering clamping mechanism and the control part. The overall structure is highly integrated.

[0020] 4) Automation: The controller determines the working status by monitoring the Hall sensor and motor current, and performs automatic control according to the predetermined workflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the appearance of an embodiment of an electro-hydraulic hybrid open-end wrench of the present invention.

[0022] Figure 2 It is a schematic diagram of the main pliers structure of an embodiment of an electro-hydraulic hybrid open-end wrench of the present invention.

[0023] Figure 3 It is a schematic diagram of the reset mechanism of the electro-hydraulic hybrid open-end wrench embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the arrangement of the connecting columns of an embodiment of the electro-hydraulic hybrid open-end wrench of the present invention.

[0025] Figure 5 It is a schematic diagram of the back-up tongs structure of an embodiment of an electro-hydraulic hybrid open-end wrench of the present invention.

[0026] Figure 6It is a schematic diagram of the preparation state of the electro-hydraulic hybrid open-end wrench embodiment of the present invention.

[0027] Figure 7 It is a schematic diagram of the make-up process used in the embodiment of the electro-hydraulic hybrid open-end wrench of the present invention.

[0028] Figure 8 It is a schematic diagram of the tightening process used in the embodiment of the electro-hydraulic hybrid open-end wrench of the present invention.

[0029] Explanation of reference numerals: 1. Electro-hydraulic hybrid open-end wrench, 2. Main pliers, 3. Connecting column, 4. Back pliers, 5. Upper cover plate, 6. Wrench housing, 7. Lower cover plate, 8. Driving wheel, 9. Idle wheel, 10. Open gear, 11. Main pliers oil cylinder, 12. Main pliers piston rod, 13. Ratchet pin, 14. Ratchet, 15. Support block, 16. Open ratchet, 17. Clamping mechanism, 18. Automatic reversing valve, 19. Spring pressurized oil tank, 20. Oil tank piston, 21. Oil tank Cover plate, 22. Sliding bearing, 23. Permanent magnet support, 24. Permanent magnet, 25. Hall sensor, 26. Motor transition shaft, 27. Reducer motor, 2801. First micro motor pump, 2802. Second micro motor pump, 29. Back clamp cylinder, 30. Trapezoidal slider, 31. Back clamp connecting rod, 32. Connecting rod pin, 33. Return spring, 34. V-type clamp, 35. Controller, 36. Control button, 37. Rotating workpiece, 38. Fixed workpiece. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] The embodiment of the present invention provides an electro-hydraulic hybrid open-end wrench 1, the structure of which is shown in FIG. Figure 1 It is mainly composed of three parts: main clamp 2, connecting column 3 and backup clamp 4. The main clamp 2 and backup clamp 4 are fixedly installed at both ends of the connecting column 3. Figure 2 The main clamp 2 is the main actuator, including a hydraulic motor-open gear set mechanism, a hydraulic cylinder-ratchet pawl mechanism, a clamping mechanism 17 and a reset mechanism; combined with Figure 4The connecting column 3 is used to transmit the torque between the main tongs 2 and the backup tongs 4, and a reduction motor 27 and two sets of micro motor pumps are arranged therein; the backup tongs 4 provide tightening counter torque support, including a cylinder-centering clamping mechanism and a controller 35. In addition, it also includes accessories such as a housing 6, upper and lower cover plates 7, a spring pressurized oil tank 19 and a support block 15.

[0033] The hydraulic motor-open gear set mechanism includes a motor and an open gear set, and the open gear mechanism includes a driving wheel 8, two idler wheels 9 and an open gear 10. The installation positions of the two idler wheels 9 are calculated according to the installation conditions of the open gear 10 set.

[0034] The oil cylinder-ratchet pawl 14 mechanism comprises a main caliper oil cylinder 11, a pawl 14, a support block 15 and an open ratchet 16. The pawl 14 is connected to the front end of the hydraulic cylinder piston rod through a pin. The support block 15 is fixed to the inner side of the housing 6 to support and guide the pawl 14 and transmit the radial reaction force on the pawl 14 to the housing 6.

[0035] The hydraulic motor-open gear set mechanism and the hydraulic cylinder-ratchet pawl mechanism are integrated in the main pliers housing;

[0036] The clamping mechanism 17 is located between the open gear 10 and the open ratchet 16, and is connected with the two by a pin to form an open gear train. The open gear train can be driven by the open gear set or the ratchet 14 to drive the clamped workpiece to achieve rotational tightening.

[0037] Combination Figure 3 The reset mechanism includes a permanent magnet 24 and a Hall sensor 25. The permanent magnet 24 is fixed on the open gear 10, and the Hall sensor 25 is fixed to the corresponding position of the main pliers housing. After the open gear 10 rotates to align the permanent magnet 24 with the Hall sensor 25, the Hall sensor 25 is triggered by induction, and the open gear 10 stops in place, realizing the reset of the open wrench.

[0038] The connecting columns 3 are three hollow columns, which are used to connect the main tongs 2 and the backup tongs 4 to transmit the tightening torque. The three hollow columns are arranged in a triangular shape, and are respectively located below the driving wheel 8, the main tongs oil cylinder and the spring booster oil tank 19. Among them, the connecting columns 3 on both sides can be used as the left and right wrenches of the electric-hydraulic hybrid open-end wrench, and a control button 36 is arranged on the right hollow column. Preferably, the connecting column 3 is an integrated structure of the main tongs housing and the backup tongs housing to enhance the overall strength and rigidity.

[0039] The reduction motor 27 includes a DC motor and a reducer. The reduction ratio of the reducer should be selected according to actual needs, taking into account the reduction ratio of the rated speed of the DC motor and the selected open gear set. The output torque of the DC motor should meet the thread tightening torque requirement of the workpiece after deceleration and amplification.

[0040] The micro motor pump comprises a DC motor, a reducer and an axial piston pump. The oil outlet pressure of the axial piston pump should meet the workpiece tightening torque requirement after conversion through the main clamp oil cylinder-ratchet pawl mechanism. Preferably, the DC motor, the reducer and the axial piston pump are slender structures to facilitate the placement of the micro motor pump.

[0041] Combination Figure 5 The oil cylinder-centering clamping mechanism includes an oil cylinder, a trapezoidal slider 30, two connecting rods symmetrically arranged on the left and right, and a V-shaped clamping claw 34 and a return spring 33 at the front end of the connecting rod. During the clamping process, the oil cylinder extends to drive the trapezoidal slider 30 forward, pushing the left and right connecting rods to rotate, and the V-shaped clamping claw 34 at the front end of the connecting rod moves synchronously toward the center to clamp and fix the workpiece 38. During the return process, the oil cylinder retracts, and the return spring 33 pulls the V-shaped clamping claw 34 back to both sides, so that the back clamp 4 is separated from the fixed workpiece.

[0042] The controller 35 includes motor control, automated process control and system status monitoring. The system status monitoring mainly monitors the oil tank temperature and pressure and the motor speed, and issues an abnormal alarm. Preferably, the automated process control determines the workflow through the Hall sensor 25 and three motor current sensors to achieve a predetermined automatic control.

[0043] The spring booster oil tank 19 includes an oil tank piston 20, a booster spring and an oil tank cover plate 21, which are integrated into the housing 6 of the master caliper 2 and are used to boost the oil in the oil tank to facilitate the motor pump to suck oil. The booster spring stiffness and compression amount should take into account the minimum and maximum pressures of the oil in the oil tank. Preferably, the oil tank pressure range is between 0.05-0.2MPa.

[0044] The electro-hydraulic hybrid open-end wrench provided in the example of the present invention is in the form of a main tong 2 and a backup tong 4 plus a connecting column 3. It adopts a structure in which the main tong housing and the backup tong housing are integrated with the connecting column 3 and the upper and lower cover plates 7, and uses aluminum-titanium alloy as a material to reduce the weight while ensuring the strength and rigidity of the wrench. Among them, the main tong 2 is integrated with an open gear 10 mechanism for buckling and a cylinder-ratchet pawl 14 mechanism for tightening. In the buckling stage, the reduction motor 27 transmits power to the driving wheel 8 through the motor transition shaft 26, and then drives the open gear 10 to rotate through two idler wheels 9. The installation position of the idler wheel 9 should meet the conditions that the horizontal distance between the two wheels is greater than the opening width of the open gear 10, and the four-wheel transmission does not interfere, so as to realize the continuous rotation of the open gear 10. Since the torque required for the buckling process is small, the strength requirements of the four gears are low, so the thickness of the four gears can be small, and weight reduction holes are set on them. During the tightening stage, the first micro-motor pump 2801 on the cylinder side of the main tongs 2 outputs high-pressure oil, pushing the main tongs cylinder to extend, and the ratchet 14 connected to the main tongs piston rod through the ratchet pin pushes the open ratchet 16 to rotate. When the cylinder is extended to reach the maximum stroke, the pressure increases, and after the motor pump current increases beyond the preset value, the automatic reversing valve 18 switches to retract the cylinder. The connecting column 3 is three hollow cylinders, which are respectively located below the driving wheel 8, the main tongs cylinder 11 and the spring booster tank 19 spring. The hollow column below the driving wheel 8 has a built-in reduction motor 27, and the other two hollow columns have built-in micro-motor pumps. In addition, the hollow columns on both sides can be used as handles for holding, and a control button 36 is set on the right hollow column to facilitate operator control. The back tongs 4 mainly include a centering clamping mechanism and a controller 35. During the clamping stage of the centering clamping mechanism, the second micro motor pump 2802 on the spring booster tank 19 side drives the back-up clamp oil cylinder 29 to extend, driving the trapezoidal slider 30 forward, and the back-up clamp connecting rod 31 arranged through the left-right symmetrical connecting rod pin 32 is pushed to rotate, and the V-shaped clamping claw 34 at the other end of the connecting rod can move synchronously toward the center to clamp the fixed workpiece. During the loosening process of the centering clamping mechanism, the back-up clamp oil cylinder 29 retracts, and the V-shaped clamping claw 34 is pulled to both sides by the return spring 33 and disengaged from the fixed workpiece.

[0045] Figures 6 to 8 This is a schematic diagram of the actual use of the electric-hydraulic hybrid open-end wrench provided in the present invention for tightening a pair of threaded workpieces. Figure 6 The figure shows a schematic diagram of preparation for use of an embodiment of the electric-hydraulic hybrid open-end wrench of the present invention. The operator holds the electric-hydraulic hybrid open-end wrench by the hollow columns on both sides, clamps it into the workpiece to be installed, and adjusts the upper and lower positions of the wrench so that the fixed workpiece is located in the opening of the backup clamp 4, the rotating workpiece 37 is located in the opening of the main clamp 2, and the connecting thread is located between the main clamp 2 and the backup clamp 4. The operator starts the micro-motor pump on the oil tank side through the control button 36 on the right hand, drives the backup clamp oil cylinder-centering clamp mechanism to clamp the fixed workpiece, and completes the preparation work. Figure 7The figure shows a schematic diagram of the make-up process used in the embodiment of the electro-hydraulic hybrid open-end wrench of the present invention. The operator starts the reduction motor 27 to drive the open-end gear mechanism to rotate continuously to make the workpiece make-up. When the make-up process stops, the reduction motor 27 is blocked, and the controller 35 detects that the current of the reduction motor 27 exceeds the preset value, the reduction motor 27 stops, and the make-up process is completed. Figure 8 The figure shows a schematic diagram of the tightening process used in the embodiment of the electro-hydraulic hybrid open-end wrench of the present invention. The operator starts the micro-motor pump on the side of the main pliers cylinder 11, and the main pliers cylinder 11 drives the ratchet 14 to extend forward and push the ratchet to rotate. When the cylinder is extended to reach the maximum stroke, the pressure increases, and after the motor pump current increases beyond the preset value, the automatic reversing valve 18 switches to retract the cylinder. Repeat the above process until the tightening torque reaches the preset value, and the tightening process is completed. After the installation is completed, the open-end wrench performs a reset process. First, the open gear 10 and the open ratchet 16 are aligned with the opening position of the shell through the Hall sensor 25. Then the operator turns off the micro-motor pump on the tank side. The V-shaped clamp 34 loosens the fixed workpiece under the action of the return spring 33. The operator takes out the open-end wrench to complete the tightening installation of the target workpiece.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An electro-hydraulic hybrid open-end wrench, characterized in that: The invention comprises a main clamp (2), a connecting column (3) and a backup clamp (4), wherein the main clamp (2) and the backup clamp (4) are fixedly mounted at two ends of the connecting column (3), and the connecting column (3) is used to connect the main clamp (2) and the backup clamp (4) and transmit the torque between the two. The main clamp (2) comprises a hydraulic motor-open gear set mechanism, a cylinder-ratchet pawl mechanism, a clamping mechanism (17) and a reset mechanism, and the backup clamp comprises a cylinder-centering clamping mechanism and a controller (35). The hydraulic motor-open gear set mechanism comprises a motor and an open gear set, wherein the open gear set comprises a driving wheel (8), two idler wheels (9) and an open gear (10), and is used to complete the buckling process; the oil cylinder-ratchet-pawl mechanism comprises a main pliers oil cylinder (11), a pawl (14), a support block (15) and an open ratchet (16), and is used to complete the tightening process; the hydraulic motor-open gear set mechanism and the hydraulic cylinder-ratchet-pawl mechanism are integrated in the main pliers housing; the clamping mechanism (17) is located between the open gear (10) and the open ratchet (16), and is driven by the open gear set or the pawl (14) to drive the clamped workpiece to achieve rotational tightening; the reset mechanism is used to align the open gear (10) and the open ratchet (16) with the opening position of the main pliers housing when the wrench is reset; The oil cylinder-centering clamping mechanism is used to clamp and fix the workpiece, and the controller is used for automatic control and system status monitoring. The oil cylinder-centering clamping mechanism and the controller (35) are integrated in the back-up clamp housing; The oil cylinder-centering clamping mechanism comprises a back-clamp oil cylinder (29), a trapezoidal slider (30), two back-clamp connecting rods (31) symmetrically arranged on the left and right, two V-shaped clamping claws (34) and a return spring (33). The back-clamp oil cylinder (29) is connected to the trapezoidal slider (30) and is used to push the trapezoidal slider (30) forward. The two sides of the trapezoidal slider (30) are respectively connected to one end of two back-clamp connecting rods (31) and are used to drive the back-clamp connecting rods (31). The other end of the back-clamp connecting rod (31) is connected to the V-shaped clamping claw (34). The V-shaped clamping claw (34) moves toward the center with the back-clamp connecting rod (31) to achieve centering clamping of the fixed workpiece. The V-shaped clamping claw (34) is also connected to one end of the return spring (33). The return spring (33) is fixed on the back-clamp. The return spring (33) pulls the V-shaped clamping claw (34) to both sides. The connecting column (3) is provided with a reduction motor (27), a first micro motor pump (2801) and a second micro motor pump (2802); the first micro motor pump (2801) is connected to the main tong oil cylinder (11), and the second micro motor pump (2802) is connected to the backup tong oil cylinder (29); The reset mechanism is composed of a permanent magnet (24) fixed on the opening gear (10) and a Hall sensor (25) fixed on the main pliers housing. When the wrench is reset, when the permanent magnet (24) and the Hall sensor (25) are aligned, the Hall sensor (25) is triggered to determine that the opening gear (10) is aligned with the opening position of the main pliers housing. An automatic reversing valve (18) is installed on one side of the master caliper oil cylinder (11) for controlling the reversing of the extension and retraction of the master caliper oil cylinder (11); a spring booster oil tank (19) is arranged on the side of the master caliper housing opposite to the master caliper oil cylinder (11); the spring booster oil tank (19) comprises an oil tank piston (20), a booster spring and an oil tank cover plate (21) for providing booster hydraulic oil for the first micro motor pump (2801); The clamping mechanism is connected to the open gear (10) and the open ratchet (16) via a stepped pin to form an open gear train; the upper side of the open ratchet (16) and the lower side of the open gear (10) each have a stepped surface, and the axial and radial positioning of the main pliers (2) is achieved by cooperating with the corresponding upper and lower stepped surfaces of the main pliers housing through an open right-angle annular sliding bearing (22); The connecting columns (3) are three hollow columns, which are arranged in a triangle shape and are respectively located below the driving wheel (8), the main tongs oil cylinder (11) and the spring booster oil tank (19); the hollow column below the driving wheel (8) has a built-in reduction motor (27), and the two hollow columns below the main tongs oil cylinder (11) and the spring booster oil tank (19) have respectively built-in first micro motor pumps (2801) and second micro motor pumps (2802); the connecting columns (3) on both sides can be used as grip handles of the electric-hydraulic hybrid open-end wrench, and a control button (36) is arranged on the right hollow column.

2. The electro-hydraulic hybrid open-end wrench according to claim 1, characterized in that: The back-up clamp oil cylinder (29) is installed on the central axis of the back-up clamp (4) opening.

3. The electro-hydraulic hybrid open-end wrench according to claim 1, characterized in that: The reduction motor (27) comprises a DC motor and a reducer, the first micro motor pump (2801) and the second micro motor pump (2802) both comprise a DC motor, a reducer and an axial piston pump, the oil outlet pressure of the axial piston pump meets the workpiece tightening torque requirement after conversion through an oil cylinder-ratchet pawl mechanism, and the DC motor, the reducer and the axial piston pump are slender structures.

4. The electro-hydraulic hybrid open-end wrench according to claim 1, characterized in that: The connecting column (3) is an integrated structure with the main tong housing and the backup tong housing to form a wrench housing (6), and an upper cover plate (5) and a lower cover plate (7) are fixedly mounted on the upper and lower ends of the wrench housing respectively.

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