A portable hydraulic wrench

Abstract

This utility model discloses a portable hydraulic wrench, including a handle module, a wrench body module, and a slider support device. The handle module includes a handle shell, inside which are housed a first hydraulic cylinder, an oil reservoir, and a second hydraulic cylinder. A handle is rotatably mounted outside the handle shell. The piston rod of the first hydraulic cylinder extends out of the handle shell and connects to the handle. An oil outlet pipe connects the cylinder body of the second hydraulic cylinder to the cavity of the first hydraulic cylinder. The wrench body module includes a wrench shell, a crank-connecting rod mechanism, a rotating shaft, and a sleeve. The wrench shell is connected to the handle shell. The crank-connecting rod mechanism and the rotating shaft are located inside the wrench shell. The piston rod of the second hydraulic cylinder is connected to the rotating shaft via the crank-connecting rod mechanism. The sleeve is detachably mounted on the rotating shaft and extends out of the wrench shell. The slider support device is movably mounted on the handle shell for adjusting the height of the hydraulic wrench. This utility model enables bolt pre-tightening or pre-loosening and is easy to carry and store.

Description

Technical Field

[0001] This utility model belongs to the technical field of wrench equipment, specifically relating to a portable hydraulic wrench. Background Technology

[0002] In machining and maintenance, bolts often need to be tightened and loosened in accordance with technical standards. Wrenches, as an important tool, are generally divided into socket wrenches and hydraulic wrenches. Socket wrenches often require manual operation, which is time-consuming and laborious, while hydraulic wrenches are often large and difficult to carry.

[0003] Chinese utility model patent CN207788761U discloses a "portable manual hydraulic wrench," comprising a housing, a rocker arm rotatably connected to the top of the housing, a hydraulic cylinder, a hydraulic motor, and an oil tank fixed inside the housing, a piston rod of the hydraulic cylinder extending outside the housing and rotatably connected to the rocker arm, a sleeve interface extending from one side of the housing coaxially connected to the output shaft of the hydraulic motor, an oil outlet pipe connecting the hydraulic motor and the hydraulic cylinder with an oil outlet valve inside the oil outlet pipe, a return oil pipe connecting the hydraulic motor and the oil tank, and the oil tank also connecting to the hydraulic cylinder via a pipe with a one-way valve inside the connecting pipe between the oil tank and the hydraulic cylinder. This patented technology outputs torque through a hydraulic system and the lever principle; however, the hydraulic motor used in this solution is typically large in size and weight, thus limiting the application scenarios of the hydraulic wrench, such as its use in confined spaces and lack of flexibility. Furthermore, the starting torque required by the hydraulic motor is usually also large, and in some cases, insufficient pressure may prevent the hydraulic motor from starting properly. Furthermore, hydraulic motors suffer from poor stability and large speed fluctuations when operating at low speeds, which in turn affects the stability of the wrench's operation. Utility Model Content

[0004] To address one of the problems existing in the prior art, this utility model provides a portable hydraulic wrench that employs a crank-connecting rod mechanism to achieve pre-tightening or pre-loosening of bolts. Simultaneously, the height of the hydraulic wrench can be adjusted according to the bolt position, making it lightweight, labor-saving, and easy to carry and secure. This utility model discloses a novel portable hydraulic wrench specifically designed for pre-tightening and pre-loosening of screws, therefore, the output torque angle does not need to be very large.

[0005] To achieve the purpose of this utility model, this utility model provides a portable hydraulic wrench, including a handle module, a wrench body module, and a slider support device;

[0006] The handle module includes a handle housing, inside which a first hydraulic cylinder, an oil reservoir pipe, and a second hydraulic cylinder are installed. A handle is rotatably mounted outside the handle housing. The piston rod of the first hydraulic cylinder extends out of the handle housing and is connected to the handle. An oil outlet pipe connects the cylinder body of the second hydraulic cylinder to the cavity of the first hydraulic cylinder.

[0007] The main body module of the wrench includes a wrench housing, a crank-connecting rod mechanism, a rotating shaft, and a sleeve. The wrench housing is connected to the handle housing. The crank-connecting rod mechanism and the rotating shaft are located inside the wrench housing. The second hydraulic cylinder includes a piston rod, which is connected to the rotating shaft through the crank-connecting rod mechanism. The sleeve is detachably mounted on the rotating shaft and extends out of the wrench housing. A small-angle torque is output through the sleeve.

[0008] The slider support device is movably mounted outside the handle housing to adjust the height of the hydraulic wrench.

[0009] The slider support can be moved relative to the handle housing to adjust its position on the handle housing.

[0010] Furthermore, the crank-connecting rod mechanism includes a crank and a connecting rod. The piston cross rod is connected to the crank via the connecting rod, and the shaft is connected to the crank. The input of the shaft torque is transmitted by the crank and the connecting rod.

[0011] Furthermore, a sleeve connection port is provided on the rotating shaft.

[0012] Furthermore, the oil storage pipe is connected to the cavity of the first hydraulic cylinder via a connecting pipe, and a one-way valve is provided on the connecting pipe.

[0013] Furthermore, the wrench housing is provided with a socket, through which the socket extends out of the wrench housing.

[0014] Furthermore, the slider support device includes a support body and two first sliders. The support body is supported on the outside of the handle housing, and the two first sliders are rotatably mounted on both sides of the bottom of the support body. The height of the hydraulic wrench is adjusted by adjusting the angle between the two first sliders.

[0015] Furthermore, mounting grooves are provided on both sides of the bottom of the support body, and shaft holes are provided in the mounting grooves. A first fixed shaft is provided on one side of the first slider, and the first fixed shaft is rotatably disposed in the shaft hole.

[0016] Furthermore, it also includes fastening screws, which are disposed on the support body and at positions corresponding to the first fixed shaft, for locking the first fixed shaft.

[0017] Furthermore, the slider support device also includes two second sliders, which are slidably disposed on the two first sliders respectively, and the two first sliders are provided with a limiting groove on the side away from the support body, and one side of the second slider can be locked in the limiting groove.

[0018] A slider support device is added to the handle, allowing for sliding of the slider support device and extension / retraction of the slider, making it easier to find the support point. The slider can be opened during use and rotated down when not in use, saving space and making it easy to carry and store.

[0019] Furthermore, a second fixed shaft is provided on one side of the second slider and on the side close to the first slider, and the second fixed shaft can be locked in the limiting groove.

[0020] Furthermore, the handle housing passes through the support body, which is able to move along the length of the handle housing.

[0021] A slider support device is installed on the handle housing. The position of the slider support device on the handle housing can be adjusted by sliding the support body, making it easier to find the force support point and fix the wrench during use.

[0022] Furthermore, it also includes a gear reversing mechanism, which is detachably mounted between the shaft and the sleeve. By setting the gear reversing mechanism, a reverse torque can be output. To output a reverse torque, the gear reversing mechanism can be connected to the shaft first, and then the sleeve can be connected to achieve the reverse requirement.

[0023] After use, the other valve on the oil reservoir can be opened by turning the knob, and the oil will return to the reservoir under atmospheric pressure. If the angle of rotation of the hydraulic wrench is not sufficient for the required angle in one use, it can be used a second time.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] (1) A portable manual hydraulic wrench of this utility model realizes the pre-tightening and pre-loosening of bolts through hydraulic transmission, crank-slider mechanism transmission and combination with socket.

[0026] (2) When using the wrench, the height of the wrench can be adjusted according to the change of the bolt position through the slider support device. After use, the slider support device can be adjusted to achieve flexibility, space saving and easy portability.

[0027] (3) The present invention can change the direction of the torque output by using a gear reversing mechanism. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of a portable hydraulic wrench provided for an embodiment of this utility model;

[0029] Figure 2 This is a schematic diagram of the portable hydraulic wrench in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the crank-slider mechanism in an embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the overall slider support device in the embodiments of this utility model;

[0032] Figure 5 This is a top view of the slider support device in an embodiment of this utility model;

[0033] Figure 6 This is a partial schematic diagram of the slider support device in an embodiment of this utility model;

[0034] Figure 7 This is a partially enlarged schematic diagram of the slider support device in an embodiment of this utility model;

[0035] Figure 8 This is a schematic diagram showing the cooperation of the rotating shaft, sleeve, and gear reversing mechanism in an embodiment of this utility model.

[0036] The figure shows: 1. Handle housing; 2. Handle; 3. Oil reservoir pipe; 4. Cavity; 5. First hydraulic cylinder; 6. Piston rod; 7. Second hydraulic cylinder; 8. Oil outlet pipe; 9. One-way valve; 10. Piston cross rod; 11. Connecting rod; 12. Crank; 13. Rotary shaft; 14. Slider support device, 14-1 Support body, 14-2 Second slider, 14-3 First slider, 14-4 Limiting groove, 14-5 First fixed shaft, 14-6 Second fixed shaft; 14-7 Fastening screw; 14-8 Mounting groove; 15 Sleeve. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, directional descriptions, such as up, down, front, back, left, and right, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These descriptions are merely for ease of description and simplification and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] This utility model provides a portable hydraulic wrench, including a handle module and a wrench body module.

[0040] Please see Figure 1 and Figure 2 The handle module includes a handle housing 1, with a handle 2 rotatably connected to the top of the handle housing 1. An oil reservoir 3, a first hydraulic cylinder 5, and a second hydraulic cylinder 7 are installed inside the handle housing 1. The piston rod 6 of the first hydraulic cylinder 5 extends out of the handle housing 1 and connects to the handle 2. An oil outlet pipe 8 connects the cylinder body of the second hydraulic cylinder 7 to the cavity 4 of the first hydraulic cylinder 5. The oil reservoir 3 and the cavity 4 of the first hydraulic cylinder 5 are connected by a connecting pipe, and a one-way valve 9 is installed on the connecting pipe.

[0041] In one embodiment of this utility model, there are two connecting pipes between the oil storage pipe 3 and the cavity 4. Each of the two connecting pipes is equipped with a one-way valve 9. The two one-way valves 9 control different flow directions, including the flow direction to the oil storage pipe 3 and the flow direction out of the oil storage pipe 3.

[0042] In one embodiment of this utility model, please refer to Figure 1 and Figure 3 The main body module of the wrench includes a wrench housing, a crank-connecting rod mechanism, a rotating shaft 13, and a sleeve 15. The wrench housing is connected to the handle housing 1. The crank-connecting rod mechanism and the rotating shaft 13 are located inside the wrench housing. The crank-connecting rod mechanism includes a crank 12 and a connecting rod 11. The second hydraulic cylinder 7 includes a piston and a piston cross rod 10. The piston and piston cross rod 10 are connected. The piston cross rod 10 is connected to the connecting rod 11 of the crank-connecting rod mechanism. The rotating shaft 13 is fixedly connected to the crank 12 of the crank-connecting rod mechanism. The torque input of the rotating shaft 13 is transmitted by the crank-connecting rod mechanism. The sleeve 15 is detachably mounted on the rotating shaft 13. The wrench housing has a sleeve opening, and the sleeve 15 extends out of the wrench housing from the sleeve opening.

[0043] When using, such as Figure 1As shown, when handle 2 is pulled up, the piston rod 6 of the first hydraulic cylinder 5 moves upward, and the hydraulic oil in the oil reservoir 3 flows out from the one-way valve 9 under atmospheric pressure and enters the first hydraulic cylinder 5. Then, when handle 2 is pressed down, the piston rod 6 of the first hydraulic cylinder 5 moves downward, and the hydraulic oil is forced through the first hydraulic cylinder 5 and the oil outlet pipe 8 into the second hydraulic cylinder 7 located to the left of the first hydraulic cylinder 5. The hydraulic oil pushes the piston rod 10 of the second hydraulic cylinder 7 to the left (towards the main body module of the wrench). The piston rod 10 and connecting rod 11 drive the crank 12 to move. Because the crank 12 is connected to the shaft 13, the shaft 13 moves accordingly. Finally, torque is output through the sleeve 15, which fits over the bolt or screw, achieving pre-tightening or pre-loosening of the bolt through the output torque. After rotation, the hydraulic oil can return to the oil reservoir 3 under atmospheric pressure by connecting the oil reservoir 3 to the outside atmosphere. If the required rotation angle cannot be fully achieved with one use of the hydraulic wrench, it can be used again, repeating this process until the desired angle is reached.

[0044] In one embodiment of this utility model, to output reverse torque, a gear reversing mechanism can be connected first to achieve reversal. The gear reversing mechanism can be an existing planetary gear structure or a gear transmission mechanism. Figure 8 As shown, when a positive torque is required, the sleeve 15 is directly connected to the output end of the rotating shaft 13; if a reverse torque is required, a gear reversing mechanism is connected to the output end of the rotating shaft 13, and then the sleeve 15 is connected to the output end of the gear reversing mechanism to achieve the reverse torque.

[0045] In one embodiment of this utility model, the oil storage pipe 3 is made of plastic.

[0046] In one embodiment of this utility model, please refer to Figure 1 A slider support device 14 is also slidably provided on the handle module, through which the height of the wrench can be adjusted.

[0047] Please see Figure 4 , Figure 6 and Figure 7 The slider support device 14 includes a support body 14-1, a first slider 14-3, a second slider 14-2, a first fixed shaft 14-5, a second fixed shaft 14-6, and a fastening screw 14-7.

[0048] In this embodiment, the handle housing 1 passes through the support body 14-1, which is supported on the outside of the handle housing 1 and can move along the length of the handle housing 1. In one embodiment of this utility model, the support body 14-1 is a cubic frame, and its length and width are the same as the diameter of the handle housing 1 of the handle module.

[0049] The bottom of the support body 14-1 is provided with recessed mounting grooves 14-8 on both sides, and the mounting grooves 14-8 are provided with shaft holes.

[0050] There are two of each of the second slider 14-2 and the first slider 14-3, which are respectively set on the left and right sides below the support body 14-1.

[0051] The first slider 14-3 has a limiting groove 14-4 on one side away from the support body 14-1, and a first fixed shaft 14-5 on the other side. The first fixed shaft 14-5 is connected to the shaft hole in the mounting groove 14-8 at the bottom of the support body 14-1, which enables the first slider 14-3 to rotate. The first fixed shaft 14-5 can drive the first slider 14-3 to rotate.

[0052] The first slider 14-3 is provided with a sliding track, and the second slider 14-2 is slidably disposed within the sliding track provided inside the first slider 14-3.

[0053] A second fixed shaft 14-6 is provided on the second slider 14-2 and on the side close to the first slider 14-3.

[0054] Two fastening screws 14-7 are provided on each of the left and right sides of the support body 14-1, coaxial with the first fixed shaft 14-5, for a total of four fastening screws 14-7. The fastening screws 14-7 secure the first slider 14-3 by locking the first fixed shaft 14-5.

[0055] In use, according to the required pre-tightening or pre-loosening bolt position, install the handle module of the hydraulic wrench into the support body 14-1 of the slider support device at the appropriate position. Pull the second sliders 14-2 on the left and right sides to pull the second fixed shaft 14-6 to the limiting groove 14-4 to fix the second sliders 14-2; then, based on the first fixed shaft 14-5, rotate the first sliders 14-3 on the left and right sides in the opposite direction to the support body 14-1 (i.e., downward direction as shown in the figure), so that the first sliders 14-3 on the left and right sides form a suitable angle (the two first sliders 14-3 from... Figure 6 The included angle shown is 180°, which is transformed into an included angle of less than 180°. The height of the hydraulic wrench can be adjusted by adjusting the size of the included angle. Then, the fastening screw 14-7 is tightened to fix the first fixed shaft 14-5 and the first slider 14-3, so as to finally determine the position of the hydraulic wrench.

[0056] When not in use, pull the second fixing shaft 14-6 out of the limiting groove 14-4 and push the second slider 14-2 into the first slider 14-3; then, rotate the first slider 14-3 to a certain position using the first fixing shaft 14-5 (e.g., ...). Figure 6In this state, the first slider 14-3 is at a 90° angle to the support body 14-1. After rotating the first fixed shaft 14-5 clockwise by 90°, the first slider 14-3 is at a 180° angle to the support body 14-1, saving space and making it easy to carry and place.

[0057] Adding a slider support device 14 to the handle allows for easy locating of the force support point and adjustment of the wrench height through the sliding of the support body and the adjustment of the angle between the two sliders. When not in use, the second slider 14-2 can be stored inside the first slider 14-3, and the first slider 14-3, which houses the second slider 14-2, can be rotated in the opposite direction relative to the support body 14-1 (i.e., rotated downwards as shown in the figure). This reduces the lateral length of the slider support device 14, saving lateral space and making it easier to carry and store.

[0058] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A portable hydraulic wrench characterized by, Includes a handle module, a wrench body module, and a slider support device; The handle module includes a handle housing, inside which a first hydraulic cylinder, an oil reservoir pipe, and a second hydraulic cylinder are installed. A handle is rotatably mounted outside the handle housing. The piston rod of the first hydraulic cylinder extends out of the handle housing and is connected to the handle. An oil outlet pipe connects the cylinder body of the second hydraulic cylinder to the cavity of the first hydraulic cylinder. The main body module of the wrench includes a wrench housing, a crank connecting rod mechanism, a rotating shaft, and a sleeve. The wrench housing is connected to the handle housing. The crank connecting rod mechanism and the rotating shaft are located inside the wrench housing. The second hydraulic cylinder includes a piston rod, which is connected to the rotating shaft through the crank connecting rod mechanism. The sleeve is detachably mounted on the rotating shaft and extends out of the wrench housing. The slider support device is movably mounted on the handle housing to adjust the height of the hydraulic wrench.

2. A portable hydraulic wrench according to claim 1, wherein The oil storage pipe is connected to the cavity of the first hydraulic cylinder via a connecting pipe, and a one-way valve is installed on the connecting pipe.

3. The portable hydraulic wrench of claim 1, wherein, The wrench housing is provided with a socket, and the socket extends out of the wrench housing through the socket.

4. The portable hydraulic wrench of claim 1, wherein, The slider support device includes a support body and two first sliders. The support body is supported on the outside of the handle housing, and the two first sliders are rotatably mounted on both sides of the bottom of the support body. The height of the hydraulic wrench is adjusted by adjusting the angle between the two first sliders.

5. A portable hydraulic wrench as defined in claim 4, wherein The support body has mounting grooves on both sides of its bottom, and shaft holes are provided in the mounting grooves. A first fixed shaft is provided on one side of the first slider, and the first fixed shaft is rotatably mounted in the shaft hole.

6. A portable hydraulic wrench as defined in claim 5, wherein It also includes fastening screws, which are disposed on the support body and at positions corresponding to the first fixed shaft, for locking the first fixed shaft.

7. A portable hydraulic wrench as defined in claim 4, wherein The slider support device also includes two second sliders, which are slidably mounted on two first sliders respectively. The two first sliders are provided with a limiting groove on the side away from the support body, and one side of the second slider can be locked in the limiting groove.

8. A portable hydraulic wrench as defined in claim 7, wherein A second fixed shaft is provided on one side of the second slider and on the side close to the first slider. The second fixed shaft can be locked in the limiting groove.

9. A portable hydraulic wrench as defined in claim 7, wherein The handle housing passes through the support body, which can move along the length of the handle housing.

10. A portable hydraulic wrench according to any one of claims 1-9, characterized in that It also includes a gear reversing mechanism, which is detachably mounted between the rotating shaft and the sleeve.

Images