Power mechanism, demolition tool and demolition system

Abstract

The present application discloses a power mechanism, a demolition tool and a demolition system. The power mechanism is used to drive a rescue working head, and the power mechanism includes a holding member and a driving member, and the driving member is connected to the rescue working head; the holding member includes a power transmission part, the power transmission part is connected to the driving member, and the holding member is pivotally connected to the driving member. The power mechanism, the demolition tool and the demolition system provided by the present application can effectively maximize the rescue space and ensure the normal operation of the demolition tool.

Description

Technical Field

[0001] The present application relates to the technical field of rescue equipment, and particularly to a power mechanism, a demolition tool and a demolition system. Background Art

[0002] Demolition tools are mainly used by fire departments, traffic police, and armed police forces in the event of fires, earthquakes, car accidents, and rescue operations. They can quickly demolish and remove obstacles such as anti-theft window railings, collapsed building steel bars, and window bars.

[0003] However, in the existing demolition tools, the handle and the rescue working head are in a straight line during use. In the case of limited rescue space, it is easy to interfere with surrounding obstacles, and a large rescue space cannot be obtained. Even the demolition tool cannot work properly at the rescue position, which has an adverse impact on the rescue work. Summary of the Invention

[0004] The main technical problem to be solved by the present application is to provide a power mechanism, a demolition tool and a demolition system that can effectively maximize the rescue space and ensure the normal operation of the demolition tool.

[0005] To solve the above technical problem, a technical solution adopted by the present application is: to provide a power mechanism for driving a rescue working head to work. The power mechanism includes a holding member and a driving member, and the driving member is connected to the rescue working head; the holding member includes a power transmission portion, the power transmission portion is connected to the driving member, and the holding member is pivotally connected to the driving member.

[0006] Further, the driving member includes an oil cylinder, and the power transmission portion includes an oil supply passage and an oil return passage provided in the holding member. Both the oil supply passage and the oil return passage extend to connect to the oil cylinder.

[0007] Further, the oil cylinder includes an oil inlet hole, an oil outlet hole and an inner cavity for containing liquid. Both the oil inlet hole and the oil outlet hole are connected to the inner cavity; the outlet of the oil supply passage is connected to the oil inlet hole, the inlet of the oil return passage is connected to the oil outlet hole, and sealing members are provided at the connection between the outlet of the oil supply passage and the oil inlet hole and at the connection between the inlet of the oil return passage and the oil outlet hole.

[0008] Further, the holding member includes a connecting portion and a limit switch. The limit switch is rotatably mounted on the connecting portion, the oil cylinder is pivotally connected to the connecting portion, a locking groove is provided on the oil cylinder, and the limit switch can be rotatably snapped into or disengaged from the locking groove.

[0009] Further, a plurality of locking grooves are included and are circumferentially distributed along the circumferential direction of the oil cylinder pivot shaft; an arc-shaped through hole surrounding the pivot shaft is provided on the connecting portion; the limit switch includes a retractable first limiting portion, the first limiting portion passes through the arc-shaped through hole, and the first limiting portion is rotatably buckled in or disengaged from the locking groove.

[0010] Further, the limit switch is further provided with a mounting groove, the first limiting portion includes a spring and a clamping column or a steel ball connected to the spring, the spring is located in the mounting groove or abuts against the plane of the limit switch facing the connecting portion, and the clamping column or the steel ball is rotatably buckled in or disengaged from the locking groove.

[0011] Further, the holding member includes a connecting portion, the connecting portion is provided with a U-shaped receiving groove, the driving member is pivotally connected to the connecting portion, and one end of the driving member can be pivoted to be received in or moved out of the receiving groove.

[0012] Further, a rotary joint is pivotally installed in the receiving groove, the rotary joint is provided with a fixing hole, the driving member and the rotary joint are fixed in the fixing hole, and the driving member is pivotally connected to the connecting portion through the rotary joint.

[0013] Further, the driving member has opposite first and second ends, the rescue working head is connected to the first end, the pivot connection between the driving member and the connecting portion is located between the first end and the second end, and the distance from the pivot connection to the first end is less than the distance from the pivot connection to the second end.

[0014] Further, the connecting portion further includes a first support arm and a second support arm arranged oppositely, the receiving groove is formed between the first support arm and the second support arm, the driving member is clamped between the first support arm and the second support arm, and is pivotally installed on the first support arm and the second support arm.

[0015] Further, the first support arm and the second support arm are provided with weight-reducing holes.

[0016] Further, the driving member includes an oil cylinder, the power transmission portion includes an oil supply passage and an oil return passage, the oil supply passage is arranged in the first support arm, the oil return passage is arranged in the second support arm, and both the oil supply passage and the oil return passage extend to connect the oil cylinder.

[0017] Further, the power mechanism further includes a rotary joint, the rotary joint is provided with a fixing hole, the driving member and the rotary joint are fixed in the fixing hole, and the rotary joint is pivotally connected to the first arm and the second arm respectively; a first through hole is provided on the rotary joint, and both the oil supply passage and the oil return passage communicate with the oil cylinder through the first through hole.

[0018] Further, the power mechanism further includes a limit switch, the limit switch is rotatably installed on the connecting portion, and a part of the rotary joint is located between the connecting portion and the limit switch; a locking groove is provided on a surface of the connecting portion facing the limit switch, and the limit switch can be rotatably snapped into or disengaged from the locking groove.

[0019] Further, a pivot hole communicating with the accommodating groove is provided on the connecting portion, the rotary joint is pivotally installed in the pivot hole, and a plurality of the locking grooves are distributed along the circumference of the pivot axis of the connecting portion. The limit switch covers the pivot hole, and the limit switch includes a retractable first limiting portion, and the first limiting portion can be rotatably snapped into or disengaged from the locking groove; a second through hole for the first limiting portion to pass through is provided on the rotary joint.

[0020] Further, there are two limit switches and two pivot holes, and the two pivot holes are respectively provided on opposite two groove walls of the accommodating groove.

[0021] Further, a second limiting portion is provided on the connecting portion, and a third limiting portion is provided on the driving member. The third limiting portion can cooperate with the second limiting portion to make the rotation angle of the driving member relative to the connecting portion less than or equal to a predetermined value.

[0022] Further, the holding member further includes a hand-held portion for a human hand to hold, and raised patterns are provided on an outer surface of the hand-held portion.

[0023] Further, the holding member further includes a joint connected to the power transmission portion, and the joint is used for externally connecting an energy supply portion; the joint is located at one end of the hand-held portion, and a connecting portion is provided at the other end of the hand-held portion.

[0024] To solve the above technical problems, another technical solution adopted by this application is: to provide a demolition tool, including:

[0025] The power mechanism according to any one of the above embodiments;

[0026] A rescue working head pivotally connected to the driving member.

[0027] To solve the above technical problems, another technical solution adopted in this application is: to provide a demolition system, including: the demolition tool as described in the above implementation manner.

[0028] Different from the prior art, the beneficial effects of this application are:

[0029] For the power mechanism, demolition tool and demolition system provided in the implementation manner of this application, since the driving member connected with the rescue working head can rotate relative to the holding member, the included angle between the driving member and the holding member can be adjusted, which can effectively maximize the rescue space and ensure the normal operation of the demolition tool.

[0030] Moreover, since the included angle between the driving member and the holding member is adjustable, when the rescuer operates the demolition tool at a high position or a low position, it can reduce the burden on the neck, back and hands of the rescuer and improve the rescue efficiency. During the rescue process, the situation where the demolition tool swings may occur. Since the included angle between the driving member and the holding member is adjustable, the swinging force of the demolition tool can be separated from the force of operating the holding member, preventing the rescuer from being injured during the rescue process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0032] Figure 1 is a schematic structural diagram of a demolition tool including a power mechanism provided in this implementation manner;

[0033] Figure 2 is a schematic structural diagram of a connecting part provided in this implementation manner;

[0034] Figure 3 is a schematic structural diagram of a limit switch provided in this implementation manner;

[0035] Figure 4 is a schematic structural diagram of a first limiting part provided in this implementation manner;

[0036] Figure 5 is a schematic structural diagram of a rotary joint provided in this implementation manner;

[0037] Figure 6 is Figure 1 the front view of;

[0038] Figure 7 is a schematic structural diagram of a second demolition tool provided in this implementation manner;

[0039] Figure 8 It is a schematic structural diagram of the third demolition tool provided in this embodiment;

[0040] Figure 9 It is a schematic structural diagram of the fourth demolition tool provided in this embodiment.

[0041] Explanation of reference numerals:

[0042] 1. Holding member; 2. Driving member; 3. Connecting portion; 4. Limit switch; 5. Locking groove; 6. First limiting portion; 7. Installation groove; 8. Spring; 9. Clamping post or steel ball; 10. Accommodating groove; 11. Rotary joint; 12. Fixing hole; 13. First end; 14. Second end; 15. First arm; 16. Second arm; 17. Weight reduction hole; 18. Pivoting hole; 19. Second through hole; 20. Hand-held portion; 21. Connector; 22. Rescue working head; 23. Shearing and demolishing working head; 24. Shearing and expanding demolishing working head; 25. Expanding demolishing working head; 26. Propping and demolishing working head. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0044] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be another element in the middle. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be another element in the middle at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0046] Please refer to Figure 1。An embodiment of the present application provides a power mechanism for driving the rescue working head 22 to work. The power mechanism includes a holding member 1 and a driving member 2. The driving member 2 is connected to the rescue working head 22. The holding member 1 includes a power transmission portion (not shown in the figure), the power transmission portion is connected to the driving member 2, and the holding member 1 is pivotally connected to the driving member 2.

[0047] The power mechanism provided by the embodiment of the present application is used to drive the rescue working head 22 to work. Since the driving member 2 connected to the rescue working head 22 can rotate relative to the holding member 1, the included angle between the driving member 2 and the holding member 1 can be adjusted, which can effectively maximize the rescue space and ensure the normal operation of the demolition tool.

[0048] Moreover, since the included angle between the driving member 2 and the holding member 1 is adjustable, when the rescue personnel operate the demolition tool at a high position or a low position, the burden on the neck, back and hands of the rescue personnel can be reduced, and the rescue efficiency can be improved. During the rescue process, the demolition tool may swing. Since the included angle between the driving member 2 and the holding member 1 is adjustable, the swinging force of the demolition tool can be separated from the force of operating the holding member 1, preventing the rescue personnel from being injured during the rescue process.

[0049] In this embodiment, the power mechanism is hydraulically driven. Of course, in other embodiments, the power mechanism can be driven in other ways, such as pneumatic pressure, etc. The present application does not make a unique limitation on this.

[0050] In this embodiment, the driving member 2 includes an oil cylinder, and the oil cylinder is used to provide power for the rescue working head 22. The power transmission portion includes an oil supply channel and an oil return channel (not shown in the figure) provided in the holding member 1. Both the oil supply channel and the oil return channel extend to connect to the oil cylinder.

[0051] Specifically, the oil cylinder may include an oil inlet hole, an oil outlet hole and an inner cavity for containing liquid (not shown in the figure). Both the oil inlet hole and the oil outlet hole are communicated with the inner cavity. The outlet of the oil supply channel is communicated with the oil inlet hole, the inlet of the oil return channel is communicated with the oil outlet hole, and sealing members are provided at the connection between the outlet of the oil supply channel and the oil inlet hole and the connection between the inlet of the oil return channel and the oil outlet hole, so as to ensure that the liquid can flow in the oil supply channel, the oil cylinder and the oil return channel and will not leak out.

[0052] In one embodiment, as Figure 1 shown, the holding member 1 includes a connecting portion 3 and a limit switch 4. The limit switch 4 is rotatably mounted on the connecting portion 3, and the oil cylinder is pivotally connected to the connecting portion 3. A locking groove 5 is provided on the oil cylinder, and the limit switch 4 can be rotatably buckled into or disengaged from the locking groove 5. When the limit switch 4 is buckled into the locking groove 5, the driving member 2 and the holding member 1 can be relatively fixed; when the limit switch 4 is disengaged from the locking groove 5, the included angle between the driving member 2 and the holding member 1 is adjustable, that is, the driving member 2 can rotate relative to the holding member 1.

[0053] Specifically, there are multiple locking grooves 5, which are circumferentially distributed along the circumferential direction of the oil cylinder pivot shaft. The connecting portion 3 is provided with an arc-shaped through hole surrounding the pivot shaft. The limit switch 4 includes a retractable first limiting portion 6. The first limiting portion 6 passes through the arc-shaped through hole, and the first limiting portion 6 is rotatably buckled in or disengaged from the locking groove 5. The arc-shaped through hole is preferably a circular through hole.

[0054] More specifically, as Figure 3 shown, the limit switch 4 is further provided with a mounting groove 7. As Figure 4 shown, the first limiting portion 6 includes a spring 8 and a clamping column or a steel ball 9 connected to the spring 8. The mounting groove 7 is located on the side of the limit switch 4 facing the connecting portion 3. The spring 8 is located in the mounting groove 7 or abuts against the plane of the limit switch 4 facing the connecting portion 3. The clamping column or the steel ball 9 is rotatably buckled in or disengaged from the locking groove 5.

[0055] When it is necessary to adjust the relative position of the driving member 2 and the holding member 1, rotate the limit switch 4 so that the spring 8 is located in the mounting groove 7. At this time, the clamping column or the steel ball 9 can be disengaged from the locking groove 5 as the connecting portion 3 rotates; when the relative position of the driving member 2 and the holding member 1 is determined, rotate the limit switch 4 again so that the spring 8 abuts against the plane of the limit switch 4 facing the connecting portion 3. At this time, the clamping column or the steel ball 9 is buckled in the locking groove 5, and the driving member 2 and the holding member 1 can be kept relatively fixed.

[0056] In another embodiment, the holding member 1 includes a connecting portion 3. As Figure 2 shown, the connecting portion 3 is provided with a U-shaped receiving groove 10. The driving member 2 is pivotally connected to the connecting portion 3, and one end of the driving member 2 can be pivotally rotated to be received in or removed from the receiving groove 10, so as to reduce the length of the power mechanism.

[0057] In this embodiment, a rotary joint 11 can be pivotally installed in the receiving groove 10. As Figure 5 shown, the rotary joint 11 is provided with a fixing hole 12, and the driving member 2 and the rotary joint 11 can be fixed by a fastener provided in the fixing hole 12. The driving member 2 is pivotally connected to the connecting portion 3 through the rotary joint 11.

[0058] Furthermore, as Figure 1 shown, the driving member 2 has opposite first end 13 and second end 14. The rescue working head 22 is connected to the first end 13. The pivot connection between the driving member 2 and the connecting portion 3 is located between the first end 13 and the second end 14, and the distance from the pivot connection to the first end 13 is less than the distance from the pivot connection to the second end 14. Since the first end 13 is connected with the rescue working head 22 and the position of the pivot connection is closer to the first end 13, the weight distribution of the demolition tool can be made more uniform, which can save effort for the user.

[0059] In a preferred embodiment, the pivotal connection between the driving member 2 and the connecting portion 3 is located at the first end 13 of the driving member 2. At this time, the driving member 2 can be entirely received in the receiving groove 10.

[0060] In this embodiment, as Figure 2 shown, the connecting portion 3 further includes a first arm 15 and a second arm 16 which are oppositely arranged. A receiving groove 10 is formed between the first arm 15 and the second arm 16. The driving member 2 is clamped between the first arm 15 and the second arm 16 and is pivotally mounted on the first arm 15 and the second arm 16.

[0061] Specifically, the oil supply passage is arranged in the first arm 15, and the oil return passage is arranged in the second arm 16. The first arm 15 and the second arm 16 are provided with weight-reducing holes 17, so that materials can be saved and the weight of the power mechanism can be further reduced.

[0062] In this embodiment, there are two rotary joints 11, which are respectively pivotally connected to the first arm 15 and the second arm 16. Each rotary joint 11 is provided with a first through hole (not shown in the figure). The oil supply passage and the oil return passage are respectively communicated with the oil cylinder through the first through hole.

[0063] Specifically, the power mechanism further includes a limit switch 4. The limit switch 4 is rotatably mounted on the connecting portion 3. As Figure 1 shown, part of the rotary joint 11 is located between the connecting portion 3 and the limit switch 4. As Figure 2 shown, a locking groove 5 is provided on the surface of the connecting portion 3 facing the limit switch 4. The limit switch 4 can be rotatably snapped into or disengaged from the locking groove 5. When the limit switch 4 is snapped into the locking groove 5, the driving member 2 and the holding member 1 can be relatively fixed; when the limit switch 4 is disengaged from the locking groove 5, the included angle between the driving member 2 and the holding member 1 is adjustable, that is, the driving member 2 can rotate relative to the holding member 1.

[0064] More specifically, as Figure 2 shown, a pivot hole 18 communicating with the receiving groove 10 is provided on the connecting portion 3. The rotary joint 11 is pivotally mounted in the pivot hole 18. A plurality of locking grooves 5 are distributed along the circumference of the pivot axis of the connecting portion 3. The limit switch 4 covers the pivot hole 18. The limit switch 4 includes a retractable first limiting portion 6, and the first limiting portion 6 can be rotatably snapped into or disengaged from the locking groove 5. As Figure 5 shown, a second through hole 19 for the first limiting portion 6 to pass through is provided on the rotary joint 11.

[0065] Preferably, there are two limit switches 4 and two pivot holes 18, and the two pivot holes 18 are respectively provided on the opposite two groove walls of the receiving groove 10. That is, the two pivot holes 18 are respectively provided on the first arm 15 and the second arm 16.

[0066] In this embodiment, asFigure 3 As shown, the limit switch 4 is further provided with an installation groove 7. As Figure 4 shown, the first limiting portion 6 includes a spring 8 and a clamping post or a steel ball 9 connected to the spring 8. The installation groove 7 is located on the side of the limit switch 4 facing the rotary joint 11. The spring 8 is located inside the installation groove 7 or abuts against the plane of the limit switch 4 facing the connecting portion 3. The clamping post or the steel ball 9 is rotatably clamped in or disengaged from the locking groove 5.

[0067] When it is necessary to adjust the relative positions of the driving member 2 and the holding member 1, the limit switch 4 is rotated so that the spring 8 is located inside the installation groove 7. At this time, the clamping post or the steel ball 9 can be disengaged from the locking groove 5 as the connecting portion 3 rotates; after the relative positions of the driving member 2 and the holding member 1 are determined, the limit switch 4 is rotated again so that the spring 8 abuts against the plane of the limit switch 4 facing the connecting portion 3. At this time, the clamping post or the steel ball 9 is clamped in the locking groove 5, and the driving member 2 and the holding member 1 can be kept relatively fixed.

[0068] In this embodiment, a second limiting portion (not shown in the figure) may be provided on the connecting portion 3, and a third limiting portion (not shown in the figure) may be provided on the driving member 2. The third limiting portion can cooperate with the second limiting portion so that the rotation angle of the driving member 2 relative to the connecting portion 3 is less than or equal to a predetermined value. In this way, while the driving member 2 rotates relative to the holding member 1, the collision between the rescue working head 22 and the holding member 1 can be avoided, ensuring the safety of the operation.

[0069] In a specific embodiment, the rotation angle of the driving member 2 relative to the connecting portion 3 is less than or equal to 260°, and the rotation angle of the driving member 2 relative to the connecting portion 3 is symmetric about the axis of the holding member 1.

[0070] In this embodiment, as Figure 1 shown, the holding member 1 further includes a hand-held portion 20 for a human hand to hold. The outer surface of the hand-held portion 20 is provided with raised patterns, so as to increase the friction between the human hand and the holding member 1 and facilitate the human hand to hold. At the same time, the rescue working head 22 can be controlled to open or close by rotating the hand-held portion 20.

[0071] Further, as Figure 1 shown, the holding member 1 further includes a joint 21 connected to the power transmission portion. The joint 21 is used to externally connect an energy supply portion. The energy supply portion may be a hydraulic power source. The hydraulic power source and the joint 21 may be connected by a hydraulic oil pipe. The hydraulic power source transports liquid through the hydraulic oil pipe to the joint 21, and then the liquid can enter the oil supply channel and then enter the oil cylinder, so as to provide power for the rescue working head 22. The joint 21 is located at one end of the hand-held portion 20, and the other end of the hand-held portion 20 is connected to the above-mentioned connecting portion 3.

[0072] Please refer to Figures 6 to 9。The embodiments of the present application also provide a demolition tool, which includes a power mechanism and a rescue working head 22.

[0073] Among them, the power mechanism can be the power mechanism in any of the above embodiments. The rescue working head 22 is pivotally connected to the driving member 2 of the power mechanism. The rescue working head 22 can rotate 360° around the axis of the driving member 2 so as to cope with different rescue environments.

[0074] In this embodiment, the embodiment of this demolition tool corresponds to the embodiment of the above power mechanism, and it can solve the technical problems solved by the embodiment of the power mechanism, and correspondingly achieve the technical effects of the embodiment of the power mechanism. Specifically, the present application will not elaborate herein.

[0075] In this embodiment, as Figures 6 to 9 shown, the rescue working head 22 can be one or more of a shearing demolition working head 23, a shearing and expanding demolition working head 24, an expanding demolition working head 25 or a propping demolition working head 26.

[0076] The embodiments of the present application also provide a demolition system, which includes the above-mentioned demolition tool. The demolition system may further include an energy supply unit. The energy supply unit can be a hydraulic power source. The hydraulic power source and the demolition tool can be connected by a hydraulic oil pipe.

[0077] In this embodiment, the embodiment of this demolition tool corresponds to the embodiment of the above demolition tool, and it can solve the technical problems solved by the embodiment of the demolition tool, and correspondingly achieve the technical effects of the embodiment of the demolition tool. Specifically, the present application will not elaborate herein.

[0078] It should be noted that in the description of this specification, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of this specification, unless otherwise specified, the meaning of "a plurality" is two or more.

[0079] Using the terms "comprising" or "including" to describe the combination of elements, components, parts or steps here also contemplates embodiments consisting essentially of these elements, components, parts or steps. Here, by using the term "may", it is intended to indicate that any attribute described as "may" included is optional.

[0080] A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step can be divided into separate multiple elements, components, parts or steps. The disclosure of "a" or "one" used to describe an element, component, part or step does not mean to exclude other elements, components, parts or steps.

[0081] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A power mechanism for driving a rescue working head, characterized in that, The power mechanism includes a holding member and a driving member, the driving member being connected to the rescue working head; the holding member includes a power transmission portion, the power transmission portion being connected to the driving member, and the holding member being pivotally connected to the driving member; The driving member has opposite first and second ends, the rescue working head being connected to the first end, and the pivot connection between the driving member and the connecting portion being located between the first end and the second end; The driving member includes an oil cylinder, and the power transmission portion includes an oil supply passage and an oil return passage provided in the holding member, both the oil supply passage and the oil return passage extending to connect to the oil cylinder.

2. The power mechanism according to claim 1, characterized in that, The oil cylinder includes an oil inlet hole, an oil outlet hole, and an inner cavity for containing liquid, the oil inlet hole and the oil outlet hole both being in communication with the inner cavity; the outlet of the oil supply passage is in communication with the oil inlet hole, the inlet of the oil return passage is in communication with the oil outlet hole, and sealing members are provided at the connection between the outlet of the oil supply passage and the oil inlet hole and at the connection between the inlet of the oil return passage and the oil outlet hole.

3. The power mechanism according to claim 1, characterized in that, The holding member includes a connecting portion and a limit switch, the limit switch being rotatably mounted on the connecting portion, the oil cylinder being pivotally connected to the connecting portion, the oil cylinder being provided with a locking groove, and the limit switch being rotatably latched in or disengaged from the locking groove.

4. The power mechanism according to claim 3, characterized in that, There are a plurality of the locking grooves, which are circumferentially distributed along the pivot axis of the oil cylinder; the connecting portion is provided with an arc-shaped through hole surrounding the pivot axis; the limit switch includes a retractable first limiting portion, the first limiting portion passing through the arc-shaped through hole, and the first limiting portion being rotatably latched in or disengaged from the locking groove.

5. The power mechanism according to claim 4, characterized in that, The limit switch is further provided with a mounting groove, the first limiting portion including a spring and a clamping post or a steel ball connected to the spring, the spring being located in the mounting groove or abutting against the plane of the limit switch facing the connecting portion, and the clamping post or the steel ball being rotatably latched in or disengaged from the locking groove.

6. The power mechanism according to claim 1, characterized in that, The holding member includes a connecting portion, the connecting portion being provided with a U-shaped receiving groove, the driving member being pivotally connected to the connecting portion, and one end of the driving member being pivotable to be received in or moved out of the receiving groove.

7. The power mechanism according to claim 6, characterized in that, A rotary joint is pivotally mounted in the receiving groove, the rotary joint being provided with a fixing hole, the driving member and the rotary joint being fixed in the fixing hole, and the driving member being pivotally connected to the connecting portion through the rotary joint.

8. The power mechanism according to claim 6, characterized in that, The connecting portion further includes a first support arm and a second support arm which are oppositely arranged, the receiving groove being formed between the first support arm and the second support arm, the driving member being clamped between the first support arm and the second support arm and pivotally mounted on the first support arm and the second support arm.

9. The power mechanism according to claim 8, characterized in that, The first support arm and the second support arm are provided with weight-reducing holes.

10. The power mechanism according to claim 8, characterized in that, The oil supply passage is provided in the first support arm, and the oil return passage is provided in the second support arm.

11. The power mechanism according to claim 10, characterized in that, The power mechanism further includes a rotary joint which is provided with a fixing hole. The driving member and the rotary joint are fixed in the fixing hole. The rotary joint is pivotally connected to the first support arm and the second support arm respectively. A first through hole is provided on the rotary joint. Both the oil supply passage and the oil return passage communicate with the oil cylinder through the first through hole.

12. The power mechanism according to claim 7 or 11, characterized in that, The power mechanism further includes a limit switch which is rotatably mounted on the connecting portion. A part of the rotary joint is located between the connecting portion and the limit switch. A locking groove is provided on the surface of the connecting portion facing the limit switch. The limit switch can be rotatably snapped into or disengaged from the locking groove.

13. The power mechanism according to claim 12, characterized in that, A pivot hole communicating with the accommodating groove is provided on the connecting portion. The rotary joint is pivotally mounted in the pivot hole. A plurality of the locking grooves are distributed along the circumference of the pivot axis of the connecting portion. The limit switch covers the pivot hole. The limit switch includes a retractable first limiting portion which can be rotatably snapped into or disengaged from the locking groove. A second through hole for the first limiting portion to pass through is provided on the rotary joint.

14. The power mechanism according to claim 13, characterized in that, There are two limit switches and two pivot holes. The two pivot holes are respectively provided on opposite two groove walls of the accommodating groove.

15. The power mechanism according to claim 3 or 6, characterized in that, A second limiting portion is provided on the connecting portion. A third limiting portion is provided on the driving member. The third limiting portion can cooperate with the second limiting portion to make the rotation angle of the driving member relative to the connecting portion less than or equal to a predetermined value.

16. The power mechanism according to claim 1, characterized in that, The holding member further includes a hand-held portion for a human hand to hold. The outer surface of the hand-held portion is provided with raised patterns.

17. The power mechanism according to claim 16, characterized in that, The holding member further includes a joint connected to the power transmission portion. The joint is used for externally connecting an energy supply portion. The joint is located at one end of the hand-held portion, and the other end of the hand-held portion is provided with a connecting portion.

18. A demolition tool, characterized in that, Comprising: The power mechanism according to claim 1; A rescue working head pivotally connected to the driving member.

19. A demolition system, characterized in that, Comprising: The demolition tool according to claim 18.

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