An open end hydraulic wrench

Abstract

The present invention discloses an open hydraulic wrench, which is mainly composed of a motor-open gear set mechanism, a hydraulic cylinder-ratchet and pawl mechanism, a clamping mechanism, a reset mechanism, a positioning mechanism, a housing, a cover plate, a handle and a reaction rod. The motor-open gear set mechanism is driven by a hydraulic motor or an electric motor, and the open gear is driven to rotate continuously through the open gear set to complete the rapid make-up process; the hydraulic cylinder-ratchet and pawl mechanism is driven by a hydraulic cylinder, and the open ratchet is driven to rotate intermittently through the ratchet and pawl mechanism to complete the tightening process of a predetermined torque; the clamping mechanism can reliably clamp the target to be installed, the reset mechanism is used for reverse positioning of the hydraulic wrench, and the positioning mechanism controls the maximum stroke of the hydraulic cylinder. The present invention divides the threaded connection process into two parts: make-up and tightening, and realizes them respectively through the motor-open gear set mechanism and the hydraulic cylinder-ratchet and pawl mechanism, and can quickly complete the tightening under the premise of ensuring the required tightening torque.

Description

Technical Field

[0001] The invention relates to a hydraulic wrench, in particular to an open hydraulic wrench suitable for threaded connection. 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, so their usage 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 portable open hydraulic wrench that is small in size and light in weight, and can complete thread tightening as quickly as possible while meeting the tightening torque. Summary of the invention

[0003] The object of the present invention is to provide an open-end hydraulic wrench with a wide range of usage scenarios.

[0004] The technical solution to achieve the purpose of the present invention is: an open-end hydraulic wrench, including a motor-open-end gear set mechanism, a hydraulic cylinder-ratchet pawl mechanism, a clamping mechanism, a resetting mechanism and an in-position mechanism;

[0005] The motor-open gear set mechanism includes a motor and an open gear set, and the open gear set consists of a driving wheel, two idler wheels and an open gear, which is used to complete the make-up process;

[0006] The hydraulic cylinder-ratchet pawl mechanism is driven by a hydraulic cylinder, and the ratchet pawl mechanism drives the open ratchet to rotate intermittently, thereby completing the tightening process of the predetermined torque;

[0007] The motor-open gear set mechanism and the hydraulic cylinder-ratchet pawl mechanism are integrated in the housing and the cover plate;

[0008] The clamping mechanism is used to clamp the target;

[0009] The reset mechanism is used to align the open gear and the open ratchet with the opening position of the housing when the wrench is reversed and reset;

[0010] The in-position mechanism is used to control the maximum extension stroke of the hydraulic cylinder.

[0011] Furthermore, the hydraulic cylinder-ratchet pawl mechanism includes a hydraulic cylinder, a pawl, a support block and an open ratchet. The pawl is connected to the front end of the hydraulic cylinder piston rod through a pin shaft. The support block is fixed on the inner side of the shell to support and guide the pawl and transmit the radial reaction force exerted on the pawl to the shell.

[0012] Furthermore, the clamping mechanism is located between the open gear and the open ratchet, and is connected to the two by a stepped pin to form an actuator; the actuator is driven by the open gear set or the ratchet to drive the clamped workpiece to achieve rotational tightening.

[0013] Furthermore, 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 actuator is achieved by cooperating with the upper and lower step surfaces through the open right-angle annular oil-free bearing.

[0014] Furthermore, the actuator is installed at the front end opening corresponding to the hydraulic wrench, and the hydraulic cylinder and the motor are installed at the rear of the hydraulic wrench.

[0015] Furthermore, the positioning mechanism is a position detection sensor, which controls the maximum extension stroke of the hydraulic cylinder by detecting the position of the pawl pin.

[0016] Furthermore, the reset mechanism is composed of a wedge block, a spring and a limit screw. The wedge block has a spring mounting hole at the upper end, a limit screw groove on the side, and a sloped bottom surface, which is installed in a slide groove at the center line position of the shell opening; the spring is installed between the shell and the wedge block mounting hole to provide a pre-tightening force for the wedge block; the limit screw limits the up and down sliding stroke of the wedge block through the screw groove.

[0017] Furthermore, an oblique groove corresponding to the position of the wedge block is provided in the middle of the upper surface of the open ratchet.

[0018] Furthermore, the driving wheel is connected to the motor shaft through a key shaft, and the motor is a hydraulic motor or a reduction motor.

[0019] Furthermore, a left handle and a right handle are respectively provided on the left rear and right rear parts of the shell, and a control button is arranged on the right handle; the reaction rod is installed on the right side of the shell, and its mounting hole is an integrated structure with the shell, and a fixing knob is provided on the mounting hole.

[0020] Compared with the prior art, the present invention has the following significant advantages: (1) The overall structure adopts an open form, which is convenient for the workpiece to be inserted and removed, and has a wide range of applications; (2) The thread fastening process is completed by a hydraulic motor-open gear set mechanism, and the thread tightening process is completed by a hydraulic cylinder-ratchet pawl mechanism, which can not only quickly complete the fastening process, but also meet the torque requirements of the tightening process; (3) It is integrated with a reset mechanism and a positioning mechanism, which can automatically complete the thread fastening, tightening and reset processes according to the system pressure, thereby realizing automatic tightening of the thread; (4) All actuators, especially the oil circuit and housing of the hydraulic system are integrated into the aluminum alloy housing and cover plate, and the overall structure is compact, light in weight and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a top view of the internal structure of the open hydraulic wrench embodiment of the present invention behind the hidden shell.

[0023] Figure 3 It is a left view of the internal structure of the open hydraulic wrench embodiment of the present invention behind the hidden shell.

[0024] Figure 4 It is a schematic diagram of the resetting mechanism of the open-end hydraulic wrench embodiment of the present invention.

[0025] Figure 5 It is a schematic diagram of the preparation state of the open-end hydraulic wrench embodiment of the present invention.

[0026] Figure 6 It is a schematic diagram of the make-up process used in the embodiment of the open-end hydraulic wrench of the present invention.

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

[0028] Explanation of the reference numerals: 1. open hydraulic wrench, 2. housing, 3. left handle, 4. right handle, 5. reaction rod, 6. control button, 7. fixing knob, 8. open ratchet, 9. open gear, 10. clamping mechanism, 11. right-angle open oil-free bearing, 12. crescent plate, 13. reset mechanism, 1301. spring, 1302. wedge block, 1303. limit screw, 14. hydraulic cylinder, 15. pawl, 16. pin shaft, 17. support block, 18. positioning mechanism, 19. motor, 20. key shaft, 21. driving wheel, 22. idler wheel, 23. cover plate, 24. target workpiece, 25. workpiece to be installed, 26. adjacent fixed workpiece. DETAILED DESCRIPTION

[0029] like Figure 1 , Figure 2 As shown, an open hydraulic wrench 1 includes a motor-open gear buckling mechanism, a hydraulic cylinder-ratchet pawl buckling mechanism, a clamping mechanism 10, a reset mechanism 13, a positioning mechanism 18, a crescent plate 12, and structural parts such as a housing 2, a cover plate 23, left and right handles 3, 4, a reaction rod 5, and a support block 17. Each main mechanism is integrated into the housing 2 and is positioned and installed in combination with the cover plate 23, so that the hydraulic wrench is integrated and lightweight.

[0030] The motor-open gear buckling mechanism includes a motor 19 and an open gear set consisting of a driving wheel 21, two idler wheels 22 and an open gear 9. The motor 19 is a hydraulic motor or a reduction motor. In the open gear set, the driving wheel 21 is connected to the motor shaft through a key shaft 20, and the two idler wheels 22 are installed at a calculated position according to the installation conditions of the open gear set.

[0031] The hydraulic cylinder-ratchet pawl locking mechanism comprises a hydraulic cylinder 14, a pawl 15, a support block 17 and an open ratchet 8. The pawl 15 is connected to the front end of the hydraulic cylinder piston rod through a pin 16. The support block 17 is fixed to the inner side of the housing, supports and guides the pawl 17, and transmits the radial reaction force of the pawl 15 to the housing.

[0032] The clamping mechanism 10 is located between the open gear 9 and the open ratchet 8, and is connected to the two by a pin to form an actuator. The actuator can be driven by the open gear set or the ratchet 15 to drive the clamped workpiece to achieve rotational tightening.

[0033] The upper side of the open ratchet 8 and the lower side of the open gear 9 each have a step surface, and the axial and radial positioning of the actuator is achieved by cooperating with the upper and lower step surfaces through the open right-angle annular oil-free bearing 11.

[0034] The crescent plate 12 is arc-shaped and is fixed to the inner circumferential surface of the opening of the open gear 9 and the open ratchet 8 by screws to support the workpiece to be tightened. By replacing the crescent plate 12 of different thicknesses and cooperating with the clamping mechanism 10, the open hydraulic wrench can achieve centering clamping of workpieces of different diameters.

[0035] The reset mechanism includes a wedge block 1302, a spring 1301 and a limit screw 1303. The wedge block 1302 has a spring mounting hole at the upper end, a limit screw groove on the side, and a sloped bottom surface, so that it can be installed in the slide groove at the center line position of the shell opening. The spring 1301 is installed between the shell and the wedge block mounting hole to provide a pre-tightening force for the wedge block 1302. The limit screw 1303 limits the up and down sliding stroke of the wedge block 1302 through the screw groove. When the hydraulic wrench 1 is reversed into place, the wedge block 1302 slides to the corresponding inclined groove on the surface of the open ratchet 8 under the action of the spring pressure, so that the open ratchet 8 stops reversing. When the wrench rotates forward through the inclined groove on the ratchet surface, the wedge block 1302 can overcome the spring pressure and slide along the inclined groove and pass through the inclined groove smoothly.

[0036] The in-position mechanism 18 is to fix the proximity switch below the support block 17. When the hydraulic cylinder 14 is extended, it drives the pawl pin shaft forward. After reaching the maximum stroke, the lower part of the pin shaft triggers the proximity switch, and the hydraulic cylinder 14 begins to retract its stroke.

[0037] The front part of the housing is an open cavity of the actuator, and the rear part is provided with a housing cavity and an oil channel of the motor and hydraulic cylinder, so as to realize the integration and light weight of the hydraulic wrench. The oil inlet and outlet are arranged on the housing panel to facilitate the connection and disassembly of the oil circuit. In addition, there is an integrated reaction rod mounting hole on the right side of the housing. Preferably, the housing 2 and the cover plate 23 are made of aluminum alloy, which can reduce the weight of the hydraulic wrench while ensuring the strength.

[0038] The left handle 3 is fixed to the left rear side of the housing 2 by four symmetrically arranged screws. The left handle 3 can be in two states, vertical or horizontal, to accommodate the installation of vertical and horizontal workpieces. The right handle 4 is fixed to the right rear side of the housing 2, and a control button 6 is arranged on it for easy holding and manipulation by the operator.

[0039] The reaction rod 5 is installed in the mounting hole on the housing 2 and fixed by the fixing knob 7, which can be easily disassembled. The reaction rod 5 in the open hydraulic wrench transfers the reaction force generated by tightening to the adjacent workpiece by leaning against the adjacent fixed workpiece, thereby reducing the burden on the operator.

[0040] The following embodiments are described with reference to the accompanying drawings. The embodiments shown below do not limit the invention described in the claims. In addition, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as solutions to the invention described in the claims.

[0041] Example

[0042] The embodiment of the present invention provides an open-end hydraulic wrench, the structure of which is referred to as Figures 1 to 3As shown, the open hydraulic wrench 1 provided by the example of the present invention has two left and right handles, wherein the left handle 3 can be switched between vertical and horizontal states, and the left end of the right handle 4 is provided with a control button 6. Preferably, the left and right handles are hollow cylinders, which are convenient for holding and reducing the overall weight of the hydraulic wrench. The reaction rod 5 is fixed in the mounting hole integrated with the housing 2 by a fixing knob 7. Preferably, the reaction rod 5 is arranged on the right side of the housing 2 in this embodiment, so that the hydraulic wrench 1 can directly offset the tightening reaction torque in the counterclockwise direction with the help of the adjacent fixed workpiece 26 on the front side of the reaction rod during use. The open hydraulic wrench 1 of the present invention completes the workpiece buckling process through a motor-open gear mechanism. Among them, the motor 19 provides tightening power, and the motor 19 transmits power to the driving gear 21 through the key shaft 20. Then, the open gear 9 is driven to rotate through two idler wheels 22. The installation position of the idler wheel 22 should meet the conditions that the horizontal distance between the two wheels is greater than the opening width of the open gear 9, and the four-wheel transmission does not interfere, so as to realize the continuous rotation of the open gear 9. Since the torque required for the buckling process is small and the strength requirements for the four gears are low, the thickness of the four gears can be small, and weight-reducing holes are set on them. The open hydraulic wrench 1 of the present invention completes the tightening process of the workpiece through a hydraulic cylinder-ratchet pawl mechanism. Among them, the hydraulic cylinder 14 is installed on the left side of the housing 2 to provide thrust. The pawl 15 is connected to the piston rod of the hydraulic cylinder 14 through the pin 16, and pushes the open ratchet 8 to rotate clockwise. When the pin moves forward to trigger the proximity switch, the hydraulic cylinder 14 drives the pawl 15 to retract, and the repeated movement of the hydraulic cylinder 14 drives the pawl to intermittently push the ratchet to rotate. When the hydraulic wrench performs a reset action, the motor reverses to drive the actuator to reverse through the open gear set mechanism, and is positioned by the reset mechanism 13.

[0043] The specific structure of the reset mechanism is as follows Figure 4 As shown, the wedge block 1302 is installed in the guide groove near the opening of the shell; the spring 1301 is installed between the shell and the guide hole of the wedge block 1302; the limit screw 1303 is fixed on the shell, and its tail is screwed into the limit groove of the wedge block. The limit screw limits the sliding limit position of the wedge block. The spring 1301 provides pre-pressure for the wedge block, and its length should ensure that the spring is still in a compressed state when the wedge block is at the lowest position, and the wedge block is not in a compressed state when it is at the highest position.

[0044] Figures 5 to 7 This is a schematic diagram of the actual use of the open hydraulic wrench provided by the present invention for tightening a vertical workpiece. Figure 5The figure shows a schematic diagram of preparation for use of an embodiment of the open-end hydraulic wrench of the present invention. The left handle 3 of the hydraulic wrench is adjusted to a vertical state, the operator holds the left and right handles of the open-end wrench, and long presses the switch on the right handle 4 to reset the open-end wrench. Then, the open-end wrench is inserted into the target workpiece 24, so that the clamping mechanism of the open-end wrench can reliably clamp the workpiece 25, and the reaction rod on the right side is placed against the adjacent fixed workpiece 26. After the preparation work is completed, the operator presses the control button 6 on the right handle to start the tightening process. Figure 6 The figure shows the process of making up the open hydraulic wrench embodiment of the present invention. The motor 19 drives the driving gear 21 to rotate forward through the key shaft 20, and drives the open gear 9 to rotate continuously through the two idler gears 22. When the motor 19 is blocked, the process of making up is completed, and the hydraulic wrench actuator switches to the position shown in FIG. Figure 7 The tightening process shown. During the tightening process, the hydraulic cylinder 14 drives the pawl 15 to extend forward and pushes the open ratchet 8 to rotate forward. When the hydraulic cylinder 14 reaches the maximum extension stroke, the proximity switch is triggered, and the hydraulic cylinder 14 drives the pawl 15 to start the retraction stroke. The above process is repeated until the tightening torque reaches the preset value, and the tightening process is completed. After the tightening is completed, the hydraulic wrench performs a reset process, aligning the open gear 9 and the open ratchet 8 with the opening position of the housing 2 and the cover plate 23, and then the operator takes out the open hydraulic wrench 1 to complete the tightening installation of the target workpiece 24.

Claims

1. An open hydraulic wrench for realizing threaded connection, characterized in that: It comprises a motor-open gear set mechanism, a hydraulic cylinder-ratchet pawl mechanism, a clamping mechanism (10), a reset mechanism (13) and an in-position mechanism (18); The motor-open gear set mechanism comprises a motor (19) and an open gear set, wherein the open gear set comprises a driving wheel (21), two idler wheels (22) and an open gear (9), and is used to complete the screwing process. The motor (19) provides tightening power, and the motor (19) transmits power to the driving gear (21) through the key shaft (20), and then drives the open gear (9) to rotate through the two idler wheels (22); the installation position of the idler wheel (22) should meet the conditions that the horizontal distance between the two wheels is greater than the opening width of the open gear (9), and the four-wheel transmission does not interfere, so as to achieve the open gear. The hydraulic cylinder-ratchet pawl mechanism is driven by the hydraulic cylinder (14), and the ratchet pawl mechanism pushes the open ratchet (8) to rotate intermittently, thereby completing the tightening process of the predetermined torque. The hydraulic cylinder-ratchet pawl mechanism comprises a hydraulic cylinder (14), a pawl (15), a support block (17) and the open ratchet (8). The pawl (15) is connected to the front end of the hydraulic cylinder piston rod through a pin (16). The support block (17) is fixed on the inner side of the housing (2), supports and guides the pawl (15), and transmits the radial reaction force exerted on the pawl (15) to the inner side of the housing (2). The pawl (15) is connected to the piston rod of the hydraulic cylinder (14) through the pin shaft (16), and pushes the open ratchet (8) to rotate clockwise; the positioning mechanism (18) is a position detection sensor, which controls the maximum extension stroke of the hydraulic cylinder (14) by detecting the position of the pawl pin shaft; when the pin shaft moves forward to trigger the position detection sensor, the hydraulic cylinder (14) drives the pawl (15) to retract, and the repeated movement of the hydraulic cylinder (14) drives the pawl to intermittently push the ratchet to rotate; the motor-open gear set mechanism and the hydraulic cylinder-ratchet pawl mechanism are integrated in the housing (2). and the cover plate (23); the clamping mechanism (10) is used to clamp the target; the resetting mechanism (13) is used to align the open gear (9) and the open ratchet (8) with the opening position of the housing (2) when the wrench is reversed and reset; the positioning mechanism (18) is used to control the maximum extension stroke of the hydraulic cylinder (14); the clamping mechanism (10) is located between the open gear (9) and the open ratchet (8), and is connected to the two by a stepped pin to form an actuator; the actuator is driven by the open gear set or the ratchet (15) to drive the clamped workpiece to achieve rotational tightening.

2. The open-end hydraulic wrench for achieving threaded connection according to claim 1, characterized in that: The upper side of the open ratchet (8) and the lower side of the open gear (9) each have a step surface, and the upper and lower step surfaces are matched by the open right-angle annular oil-free bearing (11) to achieve axial and radial positioning of the actuator.

3. The open-end hydraulic wrench for realizing threaded connection according to claim 2, characterized in that: The actuator is mounted on a front opening corresponding to the hydraulic wrench, and the hydraulic cylinder (14) and the motor (19) are mounted on the rear of the hydraulic wrench.

4. The open-end hydraulic wrench for achieving threaded connection according to claim 1, characterized in that: The reset mechanism (13) is composed of a wedge block (1302), a spring (1301) and a limit screw (1303); the wedge block (1302) has a spring mounting hole at its upper end, a limit screw slot at its side, and a sloped bottom surface, and is mounted in a slide slot at the center line of the shell opening; the spring (1301) is mounted between the shell and the wedge block mounting hole to provide a pre-tightening force for the wedge block (1302); and the limit screw (1303) limits the upward and downward sliding stroke of the wedge block through the screw slot.

5. The open-end hydraulic wrench for achieving threaded connection according to claim 4, characterized in that: An oblique groove corresponding to the position of the wedge block is provided in the middle of the upper surface of the open ratchet (8).

6. The open-end hydraulic wrench for achieving threaded connection according to claim 1, characterized in that: The driving gear (21) is connected to the motor shaft via a key shaft (20), and the motor (19) is a hydraulic motor or a reduction motor.

7. The open-end hydraulic wrench for achieving threaded connection according to claim 1, characterized in that: A left handle (3) and a right handle (4) are respectively arranged at the left rear portion and the right rear portion of the housing (2), and the right handle is provided with a control button (6); a reaction rod (5) is mounted on the right side of the housing (2), a mounting hole of the reaction rod (5) and the housing (2) are an integrated structure, and a fixing knob (7) is arranged on the mounting hole.

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