Adjustable wrench

Abstract

This invention provides an adjustable wrench, comprising a ring-shaped wrench head, multiple sliders, a handle, and a switching assembly. The ring-shaped wrench head has a first annular cavity and a second annular cavity spaced apart internally, and multiple receiving grooves arranged around its center. Each receiving groove has two ends connected to the first and second annular cavities, respectively. Multiple sliders are located within the multiple receiving grooves, with one end being a mating part that slides smoothly with the ring-shaped wrench head, having a degree of freedom to slide radially along the ring-shaped wrench head. The other end is a snap-fit ​​part that protrudes from the inner ring of the ring-shaped wrench head, and has a protrusion on its lower side. One end of the handle is connected to the ring-shaped wrench head, and it has a high-pressure chamber and a normal-pressure chamber internally. It is equipped with an adjustment assembly connected to the high-pressure chamber for adjusting its volume, and a pressure-limiting assembly for limiting the maximum pressure within the high-pressure chamber. The switching assembly is connected to the handle and is used to control the communication between the high-pressure chamber and the normal-pressure chamber and either the first or second annular cavity.

Description

Technical Field

[0001] This invention belongs to the field of repair tool technology, specifically relating to an adjustable wrench. Background Technology

[0002] A torque wrench, also known as a torque-adjustable wrench, is a type of wrench used when the tightness of screws and bolts is critical. A torque wrench allows the operator to apply a specific torque value.

[0003] When using a torque wrench, it is usually necessary to carry multiple sockets of different sizes to accommodate screws and bolts of different sizes, which is extremely inconvenient during use. Summary of the Invention

[0004] This invention provides an adjustable torque wrench, which is designed to accommodate screws and bolts of various sizes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an adjustable wrench, comprising:

[0006] The annular wrench has a first annular cavity and a second annular cavity spaced apart inside, and a plurality of receiving grooves are provided around the center. The two ends of each receiving groove are respectively connected to the first annular cavity and the second annular cavity.

[0007] Multiple sliders are located in multiple receiving slots, one end of which is a mating part that slides with the annular wrench; the other end is a snap-fit ​​part that protrudes from the inner ring of the annular wrench and has a protrusion on its lower side.

[0008] The handle, one end of which is connected to the annular wrench, has a high-pressure chamber and a normal-pressure chamber inside, and is equipped with an adjustment component connected to the high-pressure chamber for adjusting the volume of the high-pressure chamber and a pressure limiting component for limiting the maximum pressure in the high-pressure chamber; and

[0009] A switching component, connected to the grip, is used to control the communication between the high-pressure chamber and the normal-pressure chamber and the first annular chamber or the second annular chamber.

[0010] In one possible implementation of the adjustable wrench provided by the present invention, the first annular cavity and the second annular cavity are concentrically arranged, the plurality of receiving grooves are six in number, and the included angle between two adjacent receiving grooves is sixty degrees.

[0011] In one possible implementation of the adjustable wrench provided by the present invention, there are six sliders, each disposed in one of the six receiving slots, and each slider has a degree of freedom to slide radially along the annular wrench head.

[0012] In one possible implementation of the adjustable wrench provided by the present invention, an adjusting rod is further included. A groove is provided on the lower side of the locking portion of the slider. The protrusion is slidably disposed in the groove. The outer side of the adjusting rod is threaded and threadedly connected to the slider. One end is rotatably connected to the slider, and the other end extends out of the upper side of the slider.

[0013] In one possible implementation of the adjustable wrench provided by the present invention, the adjusting assembly includes a first piston, a first connecting rod, and a threaded sleeve. The first piston is slidably disposed in the high-pressure chamber. The outer side of the first connecting rod is threaded, one end of which is connected to the piston, and the other end is threadedly connected to the threaded sleeve. The threaded sleeve is rotatably connected to the handle and protrudes from the tail end of the handle.

[0014] In one possible implementation of the adjustable wrench provided by the present invention, the pressure limiting component includes an overflow valve, the oil inlet of which is connected to the high-pressure chamber, and the oil outlet of which is connected to the normal pressure chamber.

[0015] In one possible implementation of the adjustable wrench provided by the present invention, a second piston and a second connecting rod are further included. The second piston is slidably disposed in the atmospheric pressure chamber, and the second connecting rod is slidably engaged with the handle, with one end connected to the second piston and the other end extending out of the tail end of the handle.

[0016] In one possible implementation of the adjustable wrench provided by the present invention, a spring is also included, which passes through the second connecting rod, with one end abutting against the second piston and the other end abutting against the atmospheric pressure chamber.

[0017] In one possible implementation of the adjustable wrench provided by the present invention, a one-way valve is also included. The one-way valve is disposed between the high-pressure chamber and the normal-pressure chamber and connected to the handle. The oil inlet of the one-way valve is connected to the normal-pressure chamber, and the oil outlet is connected to the high-pressure chamber.

[0018] In one possible implementation of the adjustable wrench provided by the present invention, the switching component is a two-position four-way reversing valve. Two oil ports on one side of the two-position four-way reversing valve are respectively connected to the high-pressure chamber and the normal-pressure chamber, and two oil ports on the other side are respectively connected to the first annular chamber and the second annular chamber.

[0019] The beneficial effects of the adjustable wrench provided by this invention are as follows: Compared with the prior art, the adjustable wrench provided by this invention has a sliding block with a locking part suitable for locking external hexagonal screws and bolts, and a protrusion on the lower side of the locking part suitable for locking internal hexagonal screws and bolts. During use, hydraulic oil is filled into the first annular cavity, the second annular cavity, the receiving groove, the normal pressure chamber, and the high pressure chamber. The switching component is operated to connect the high pressure chamber with the first annular cavity and the normal pressure chamber with the second annular cavity. By adjusting the volume of the high pressure chamber, hydraulic oil can be forced through the first annular cavity into the receiving groove at the distal end of the sliding block, causing the sliding block to slide towards the center of the annular wrench head, thus adjusting the wrench to accommodate smaller sizes of external hexagonal screws and bolts. By adjusting the volume of the high pressure chamber, hydraulic oil can flow from the receiving groove through the first annular cavity into the high pressure chamber, allowing the wrench to accommodate smaller sizes of external hexagonal screws and bolts. The slider slides away from the center of the ring wrench, thus increasing the size of hexagonal screws and bolts that the wrench can accommodate. The switching assembly connects the high-pressure chamber to the second annular chamber and the normal-pressure chamber to the first annular chamber. By adjusting the volume of the high-pressure chamber, hydraulic oil is forced into the receiving groove near the slider through the second annular chamber, causing the slider to slide away from the center of the ring wrench, thus increasing the size of hexagonal screws and bolts that the wrench can accommodate. Conversely, by increasing the volume of the high-pressure chamber, hydraulic oil flows from the receiving groove into the high-pressure chamber through the second annular chamber, causing the slider to slide towards the center of the ring wrench, thus decreasing the size of hexagonal screws and bolts that the wrench can accommodate. Simultaneously, the pressure limiting assembly adjusts and limits the maximum pressure within the high-pressure chamber, thereby adjusting the maximum torque that the wrench can apply. Attached Figure Description

[0020] Figure 1 A schematic diagram of the main structure of an adjustable wrench provided in an embodiment of the present invention;

[0021] Figure 2 For along Figure 1 Cross-sectional view of line AA in the middle;

[0022] Figure 3 For along Figure 2 Cross-sectional view of the middle BB line;

[0023] Figure 4 For along Figure 2 Cross-sectional view of the CC line;

[0024] Explanation of reference numerals in the attached figures:

[0025] 10. Annular wrench head; 11. First annular cavity; 12. Second annular cavity; 13. Receiving groove;

[0026] 20. Slider; 21. Mating part; 22. Snap-fit ​​part; 23. Protrusion; 24. Adjusting rod;

[0027] 30. Handle; 31. High-pressure chamber; 32. Normal-pressure chamber; 41. First piston;

[0028] 42. First connecting rod; 43. Sleeve; 50. Relief valve; 61. Second piston;

[0029] 62. Second connecting rod; 63. Spring; 70. Check valve; 80. Two-position four-way directional valve. Detailed Implementation

[0030] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0034] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0035] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0037] Please refer to the following: Figures 1 to 4 The adjustable wrench provided by the present invention will now be described.

[0038] The adjustable wrench includes a ring head 10, multiple sliders 20, a handle 30, and a switching assembly. The ring head 10 has a first annular cavity 11 and a second annular cavity 12 spaced apart internally, and multiple receiving grooves 13 arranged around its center. Each receiving groove 13 has two ends communicating with the first annular cavity 11 and the second annular cavity 12, respectively. The multiple sliders 20 are located within the multiple receiving grooves 13, with one end being a mating part 21 that slides smoothly against the ring head 10. The sliders 20 have the ability to slide radially along the ring head 10. The other end is a snap-fit ​​part 22 that protrudes from the inner ring of the annular wrench head 10, and a protrusion 23 is provided on the lower side; one end of the handle 30 is connected to the annular wrench head 10, and a high-pressure chamber 31 and a normal-pressure chamber 32 are provided inside, and an adjustment component connected to the high-pressure chamber 31 is provided to adjust the volume of the high-pressure chamber 31 and a pressure limiting component is provided to limit the maximum pressure in the high-pressure chamber 31; the switching component is connected to the handle 30 and is used to control the high-pressure chamber 31 and the normal-pressure chamber 32 to communicate with the first annular chamber 11 or the second annular chamber 12.

[0039] Specifically, the mating part 21 and the snap-fit ​​part 22 of the slider 20 are connected, and the cross-sectional area of ​​the mating part 21 is larger than the cross-sectional area of ​​the connecting part; the switching component is provided with a first station and a second station. When the switching component is in the first station, the high pressure chamber 31 is connected to the first annular chamber 11, and the normal pressure chamber 32 is connected to the second annular chamber 12; when the switching component is in the second station, the high pressure chamber 31 is connected to the second annular chamber 12, and the normal pressure chamber 32 is connected to the first annular chamber 11.

[0040] It should be noted that the locking part 22 of the slider 20 is suitable for locking external hexagonal screws and bolts, and the protrusion 23 on the lower side of the locking part 22 is suitable for locking internal hexagonal screws and bolts. During use, hydraulic oil is filled into the first annular cavity 11, the second annular cavity 12, the receiving groove 13, the normal pressure chamber 32, and the high pressure chamber 31. The switching assembly is operated to position it in the first working position, connecting the high pressure chamber 31 to the first annular cavity 11 and the normal pressure chamber 32 to the second annular cavity 12. By adjusting the volume of the high pressure chamber 31, hydraulic oil can be forced through the first annular cavity 11 into the receiving groove 13 at the far end of the slider 20, causing the slider 20 to slide towards the center of the annular wrench 10. This allows for adjusting the size of external hexagonal screws and bolts that the wrench can accommodate. By adjusting the volume of the high pressure chamber 31, hydraulic oil can flow from the receiving groove 13 through the first annular cavity 11 into the high pressure chamber 31, causing the slider 20 to slide away from the center of the annular wrench 10. The wrench can be adjusted to accommodate a wider range of hexagonal screws and bolts by sliding the wrench towards the center of the ring head 10. Simultaneously, the switching assembly is operated to the first position, connecting the high-pressure chamber 31 to the second annular chamber 12 and the normal-pressure chamber 32 to the first annular chamber 11. Adjusting the volume of the high-pressure chamber 31 via the adjusting assembly allows hydraulic oil to be forced through the second annular chamber 12 into the receiving groove 13 near the end of the slider 20, causing the slider 20 to slide away from the center of the ring head 10, thus increasing the wrench's capacity to accommodate hexagonal screws and bolts. Conversely, increasing the volume of the high-pressure chamber 31 via the adjusting assembly allows hydraulic oil to flow from the receiving groove 13 into the high-pressure chamber 31 through the second annular chamber 12, causing the slider 20 to slide towards the center of the ring head 10, thus decreasing the wrench's capacity to accommodate hexagonal screws and bolts. At the same time, the pressure limiting assembly adjusts and limits the maximum pressure within the high-pressure chamber 31, thereby adjusting the maximum torque that the wrench can apply.

[0041] The beneficial effects of the adjustable wrench provided in this embodiment of the invention are as follows: Compared with the prior art, the adjustable wrench provided in this embodiment of the invention has a locking part 22 of the slider 20 suitable for locking external hexagonal screws and bolts, and a protrusion 23 on the lower side of the locking part 22 suitable for locking internal hexagonal screws and bolts; during use, hydraulic oil is filled into the first annular cavity 11, the second annular cavity 12, the receiving groove 13, the normal pressure cavity 32, and the high pressure cavity 31, and the switching component is operated to connect the high pressure cavity 31 with the first annular cavity 11. The high-pressure chamber 31 is connected to the second annular chamber 12. By adjusting the volume of the high-pressure chamber 31, hydraulic oil can be forced into the receiving groove 13 at the distal end of the slider 20 through the first annular chamber 11, causing the slider 20 to slide towards the center of the annular wrench 10. This allows the wrench to accommodate smaller sizes of hexagonal screws and bolts. By adjusting the volume of the high-pressure chamber 31, hydraulic oil can flow from the receiving groove 13 into the high-pressure chamber 31 through the first annular chamber 11, causing the slider 20 to move away from the annular wrench 10. The wrench can be adjusted to accommodate a wider range of hexagonal screws and bolts by sliding the wrench towards the center of the ring head 10. By controlling the switching assembly, the high-pressure chamber 31 is connected to the second annular chamber 12, and the normal-pressure chamber 32 is connected to the first annular chamber 11. Adjusting the volume of the high-pressure chamber 31 via the adjusting assembly allows hydraulic oil to be forced through the second annular chamber 12 into the receiving groove 13 near the end of the slider 20, causing the slider 20 to slide away from the center of the ring head 10, thus increasing the size of the hexagonal screws and bolts that the wrench can accommodate. Conversely, increasing the volume of the high-pressure chamber 31 via the adjusting assembly allows hydraulic oil to flow from the receiving groove 13 into the high-pressure chamber 31 through the second annular chamber 12, causing the slider 20 to slide towards the center of the ring head 10, thus decreasing the size of the hexagonal screws and bolts that the wrench can accommodate. This allows the wrench to accommodate various sizes of hexagonal screws, headstock screws, and bolts. Simultaneously, the pressure limiting assembly adjusts and limits the maximum pressure within the high-pressure chamber 31, thereby adjusting the maximum torque that the wrench can apply.

[0042] Specifically, such as Figure 1 and Figure 3 As shown, in a specific embodiment of the adjustable wrench provided in this invention, the first annular cavity 11 and the second annular cavity 12 are concentrically arranged, and there are six receiving grooves 13, with an included angle of sixty degrees between two adjacent receiving grooves 13.

[0043] Furthermore, such as Figure 1 and Figure 3 As shown, in a specific embodiment of the adjustable wrench provided in this invention, there are six sliders 20, which are respectively disposed in six receiving slots 13, and each has a degree of freedom to slide radially along the annular wrench head 10.

[0044] In use, the locking parts 22 of the six sliders 20 respectively engage with the six sides of the hexagonal screw or bolt.

[0045] like Figure 2 and Figure 4 As shown, in a specific embodiment of the adjustable wrench provided in this invention, an adjusting rod 24 is also included. A groove is provided on the lower side of the snap-fit ​​portion 22 of the slider 20, and a protrusion 23 is slidably disposed in the groove. The adjusting rod 24 is threaded on the outer side and threadedly connected to the slider 20. One end is rotatably connected to the slider 20, and the other end extends out of the upper side of the slider 20.

[0046] It should be noted that by turning the adjusting rod 24, the distance between the protrusion 23 and the slider 20 can be adjusted so that it can be engaged with the six sides of the internal hexagon screw or bolt.

[0047] Specifically, such as Figure 1 and Figure 2 As shown in the specific implementation of the adjustable wrench provided in this embodiment of the invention, the adjusting component includes a first piston 41, a first connecting rod 42 and a screw sleeve 43. The first piston 41 is slidably disposed in the high-pressure chamber 31. The outer side of the first connecting rod 42 is provided with threads, one end of which is connected to the piston and the other end of which is threadedly connected to the screw sleeve 43. The screw sleeve 43 is rotatably connected to the handle 30 and protrudes from the tail end of the handle 30 so that the operator can turn the screw sleeve 43.

[0048] Tightening the screw sleeve 43 can drive the first connecting rod 42 to move the first piston 41 back and forth in the high-pressure chamber 31, thereby adjusting the volume of the high-pressure chamber 31.

[0049] like Figure 1 and Figure 2 As shown, in a specific embodiment of the adjustable wrench provided in this invention, the pressure limiting component includes an overflow valve 50, the oil inlet of which is connected to the high-pressure chamber 31, and the oil outlet of which is connected to the normal pressure chamber 32.

[0050] It should be noted that by adjusting the rated pressure of the relief valve 50, the limiting pressure in the high-pressure chamber 31 can be adjusted so that when the hexagonal screw or bolt reaches the required torque, the pressure in the high-pressure chamber 31 just reaches the aforementioned limiting pressure. As the wrench continues to apply torque to the hexagonal screw or bolt, the pressure in the high-pressure chamber 31 exceeds the rated pressure of the relief valve 50. The hydraulic oil in the high-pressure chamber 31 flows into the normal pressure chamber 32 through the relief valve 50. If the screw or bolt is an external hexagonal screw or bolt, the slider 20 will move away from the center of the ring wrench 10 at this time, increasing the distance between the locking parts 22 on the slider 20 until it is insufficient to lock the external hexagonal screw or bolt, thus preventing further application of torque to the external hexagonal screw or bolt. If the screw or bolt is an internal hexagonal screw or bolt, the slider 20 will move closer to the center of the ring wrench 10 at this time, decreasing the distance between the protrusions 23 on the slider 20 until it is insufficient to lock the internal hexagonal screw or bolt, thus preventing further application of torque to the internal hexagonal screw or bolt.

[0051] like Figure 1 and Figure 2 As shown, in a specific embodiment of the adjustable wrench provided in this invention, a second piston 61 and a second connecting rod 62 are also included. The second piston 61 is slidably disposed in the normal pressure chamber 32, and the second connecting rod 62 is slidably engaged with the handle 30, with one end connected to the second piston 61 and the other end extending out of the tail end of the handle 30.

[0052] Furthermore, such as Figure 1 and Figure 2 As shown, in a specific embodiment of the adjustable wrench provided in this invention, a spring 63 is also included. The spring 63 passes through the second connecting rod 62, with one end abutting against the second piston 61 and the other end abutting against the constant pressure chamber 32.

[0053] It should be noted that the spring 63 is in a compressed state, which keeps a certain pressure in the normal pressure chamber 32, thereby subjecting both sides of the mating part 21 of the slider 20 to a certain pressure, thus preventing the slider 20 from shaking in the receiving groove 13.

[0054] like Figure 1 and Figure 2 As shown, in a specific embodiment of the adjustable wrench provided in this invention, a one-way valve 70 is also included. The one-way valve 70 is located between the high-pressure chamber 31 and the normal-pressure chamber 32 and is connected to the handle 30. The oil inlet of the one-way valve 70 is connected to the normal-pressure chamber 32, and the oil outlet is connected to the high-pressure chamber 31.

[0055] This allows the hydraulic oil flowing from the high-pressure chamber 31 into the normal-pressure chamber 32 via the overflow valve 50 to be re-pressed into the high-pressure chamber 31 after use, thus preventing the hydraulic oil in the high-pressure chamber 31 from becoming too low after multiple uses.

[0056] like Figure 1 and Figure 2 As shown, in a specific embodiment of the adjustable wrench provided in this invention, the switching component is a two-position four-way reversing valve 80. Two oil ports on one side of the two-position four-way reversing valve 80 are respectively connected to the high-pressure chamber 31 and the normal-pressure chamber 32, and two oil ports on the other side are respectively connected to the first annular chamber 11 and the second annular chamber 12.

[0057] Specifically, the two-position four-way directional valve 80 has the aforementioned first position and second position. When it is necessary to tighten the external hexagonal screw or bolt, the two-position four-way directional valve 80 is placed in the first position, so that the high-pressure chamber 31 is connected to the first annular chamber 11 and the normal pressure chamber 32 is connected to the second annular chamber 12. When it is necessary to tighten the internal hexagonal screw or bolt, the two-position four-way directional valve 80 is placed in the second position, so that the high-pressure chamber 31 is connected to the second annular chamber 12 and the normal pressure chamber 32 is connected to the first annular chamber 11.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adjustable-size wrench, characterized in that, include: The annular wrench has a first annular cavity and a second annular cavity spaced apart inside, and a plurality of receiving grooves are provided around the center. The two ends of each receiving groove are respectively connected to the first annular cavity and the second annular cavity. Multiple sliders are located in multiple receiving slots, one end of which is a mating part that slides with the annular wrench; the other end is a snap-fit ​​part that protrudes from the inner ring of the annular wrench and has a protrusion on its lower side. The handle is connected to the annular wrench at one end, and has a high-pressure chamber and a normal-pressure chamber inside. It is also equipped with an adjustment component connected to the high-pressure chamber and adapted to adjust the volume of the high-pressure chamber, and a pressure limiting component adapted to limit the maximum pressure in the high-pressure chamber. as well as A switching component, connected to the grip, is used to connect the high-pressure chamber to the first annular chamber and the normal-pressure chamber to the second annular chamber; or to connect the high-pressure chamber to the second annular chamber and the normal-pressure chamber to the first annular chamber. The adjustment assembly includes a first piston, a first connecting rod, and a screw sleeve. The first piston is slidably disposed in the high-pressure chamber. The outer side of the first connecting rod is threaded, with one end connected to the first piston and the other end threadedly connected to the screw sleeve. The screw sleeve is rotatably connected to the handle and protrudes from the tail end of the handle. It also includes a second piston and a second connecting rod. The second piston is slidably disposed in the atmospheric pressure chamber, and the second connecting rod is slidably engaged with the handle. One end is connected to the second piston, and the other end extends out of the tail end of the handle.

2. The adjustable wrench as described in claim 1, characterized in that, The first annular cavity and the second annular cavity are arranged concentrically, and there are six of the plurality of receiving slots, with an included angle of sixty degrees between any two adjacent receiving slots.

3. The adjustable wrench as described in claim 2, characterized in that, The plurality of sliders comprises six, each disposed in one of the six receiving slots, and each has a degree of freedom to slide radially along the annular wrench.

4. The adjustable wrench as described in claim 2, characterized in that, It also includes an adjusting rod, and a groove is provided on the lower side of the snap-fit ​​portion of the slider. The protrusion is slidably disposed in the groove. The adjusting rod is threaded on the outer side and threadedly connected to the slider. One end is rotatably connected to the slider, and the other end extends out of the upper side of the slider.

5. The adjustable wrench as described in claim 1, characterized in that, The pressure limiting component includes an overflow valve, the oil inlet of which is connected to the high-pressure chamber, and the oil outlet of which is connected to the normal-pressure chamber.

6. The adjustable wrench as described in claim 1, characterized in that, It also includes a spring, which passes through the second connecting rod, with one end abutting against the second piston and the other end abutting against the atmospheric pressure chamber.

7. The adjustable wrench as described in claim 6, characterized in that, It also includes a one-way valve, which is located between the high-pressure chamber and the normal-pressure chamber and connected to the handle. The oil inlet of the one-way valve is connected to the normal-pressure chamber, and the oil outlet is connected to the high-pressure chamber.

8. The adjustable wrench as described in claim 1, characterized in that, The switching component is a two-position four-way directional valve. Two oil ports on one side of the two-position four-way directional valve are connected to the high-pressure chamber and the normal-pressure chamber, respectively, and two oil ports on the other side are connected to the first annular chamber and the second annular chamber, respectively.

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