Forcible entry tool and hydraulic device thereof

Abstract

The invention provides a forcible entry tool and a hydraulic device thereof. The hydraulic device comprises a hydraulic execution unit and a hydraulic power unit. The hydraulic execution unit comprises a hydraulic cylinder, a piston rod and an oil return rod, a hydraulic cavity is defined by one end of the hydraulic cylinder, and the piston rod is inserted into the hydraulic cavity and can slide along the hydraulic cavity; the other end of the hydraulic cylinder is provided with an oil inlet channel and an oil return channel. The two ends of the oil inlet channel communicate with the hydraulic power unit and the hydraulic cavity correspondingly. A mounting cavity is formed in the middle of the piston rod and communicates with the hydraulic cavity, one end of the oil return rod is inserted into the mounting cavity, the other end of the oil return rod extends out of the mounting cavity and can seal or open a connecting opening of the oil return channel and the hydraulic cavity, and then oil return control over the oil return channel is achieved. According to the hydraulic device provided by the embodiment of the invention, the single-action principle is adopted, the return of the piston rod is completed by utilizing the elastic reset piece, and compared with a traditional double-action hydraulic device, the hydraulic device has the characteristics of simple structure, high reliability and low failure rate.

Description

Technical Field

[0001] This application relates to the technical field of demolition tools, specifically to a demolition tool and its hydraulic device. Background Technology

[0002] In conventional solutions, the hydraulic devices of demolition tools are generally based on a double-acting principle, meaning that both the feeding and retraction of the demolition head are achieved through hydraulic drive. This type of double-acting hydraulic device has problems such as complex structure, high requirements for hydraulic drive, and high failure rate. Summary of the Invention

[0003] The first aspect of this application provides a hydraulic device, which includes: a hydraulic actuator and a hydraulic power unit; The hydraulic actuator includes a hydraulic cylinder, a piston rod, and a return rod. One end of the hydraulic cylinder is surrounded to form a hydraulic cavity, and the piston rod is inserted into the hydraulic cavity and can slide along the hydraulic cavity. The other end of the hydraulic cylinder is provided with an oil inlet channel and an oil return channel, and the two ends of the oil inlet channel are respectively connected to the hydraulic power unit and the hydraulic chamber; The piston rod has a mounting cavity in the middle, which is connected to the hydraulic cavity. One end of the return oil rod is inserted into the mounting cavity, and the other end extends to the outside of the mounting cavity and can seal or open the connection between the return oil channel and the hydraulic cavity, thereby realizing the return oil control of the return oil channel.

[0004] In some optional embodiments, the hydraulic actuator further includes a first reset member, which is sleeved on the outer periphery of the piston rod. The two ends of the first reset member respectively abut against the inner wall of the hydraulic chamber and the major diameter of the piston rod. The first reset member is used to reset the piston rod.

[0005] In some optional embodiments, the hydraulic actuator further includes a second reset member, which is sleeved on the outer periphery of the return rod, and the two ends of the second reset member respectively abut against the flange of the return rod away from the return channel and the port position of the mounting cavity.

[0006] In some alternative embodiments, both the first reset member and the second reset member are compression springs.

[0007] In some optional embodiments, the hydraulic cylinder is further provided with an oil unloading channel, which is connected to the hydraulic chamber. The hydraulic actuator further includes a control valve, which is connected to the oil unloading channel and is used to control the opening and closing of the oil unloading channel.

[0008] In some alternative embodiments, the hydraulic device further includes a base connected to and cooperating with the hydraulic cylinder to form the hydraulic chamber.

[0009] In some alternative embodiments, the hydraulic device further includes an electric drive unit connected to the hydraulic power unit, the electric drive unit being used to drive the hydraulic power unit.

[0010] In some alternative embodiments, the hydraulic power unit includes an axial piston pump, and the electric drive unit includes a motor and an electronic control assembly. The motor is connected to the axial piston pump, and the electronic control assembly is connected to the motor. The motor can drive the axial piston pump to pump hydraulic oil into the hydraulic chamber.

[0011] In some alternative embodiments, the axial piston pump includes a central shaft, a swashplate, a pump body, and a piston; The central shaft is connected to the motor and the pump body at both ends, respectively; the plunger is disposed in the pump body; the swashplate is sleeved on the central shaft and supports the plunger, which is used to convert the rotational motion of the central shaft into the reciprocating motion of the plunger.

[0012] Secondly, this application provides a demolition tool, which includes a demolition head and the hydraulic device described in the above embodiments. The demolition head is connected to the hydraulic actuator of the hydraulic device and can perform demolition operations under the drive of the hydraulic actuator.

[0013] The hydraulic device provided in this application adopts a single-acting principle, and the retraction of the piston rod is completed by an elastic reset component. Compared with the traditional double-acting hydraulic device, it has the characteristics of simple structure, high reliability and low failure rate. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the demolition tool of this application; Figure 2 yes Figure 1 A structural schematic diagram of the demolition tool from another perspective in the embodiment; Figure 3 yes Figure 2 A schematic diagram of the disassembly structure of the demolition tool in the embodiment; Figure 4 yes Figure 2 A schematic diagram of the split structure of the head-cutting unit in the embodiment; Figure 5 This is a schematic diagram showing the disassembled structure of an embodiment of the hydraulic actuator of this application; Figure 6 This is a cross-sectional structural schematic diagram of an embodiment of the demolition tool of this application; Figure 7 yes Figure 6 An enlarged structural diagram at point A in the embodiment; Figure 8 This is a schematic diagram of the structure of the electric drive unit and the hydraulic power unit in this application. Figure 9 This is a schematic diagram showing the disassembled structure of an embodiment of the hydraulic power unit of this application; Figure 10 This is a structural diagram of another state of the demolition tool in this application; Figure 11 This is a partial cross-sectional view of another embodiment of the demolition tool of this application; Figure 12 This is a structural schematic diagram of another state of the hydraulic device in this embodiment; Figure 13 This is a schematic diagram of the structure of an embodiment of the return oil rod of this application. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0017] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] This application provides a demolition tool, please refer to the following embodiments. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of an embodiment of the demolition tool of this application. Figure 2 yes Figure 1 This embodiment shows a structural schematic diagram of the demolition tool from another perspective. The demolition tool includes a demolition head 20 and a hydraulic device 10. The demolition head 20 is connected to the hydraulic device 10 and can perform demolition operations under the drive of the hydraulic device 10. The demolition head 20 may include an expander, a door opener, a shearer, and a rebar cutter. The detailed structure of the expander, door opener, and shearer is within the understanding of those skilled in the art and will not be described in detail here. In this embodiment, the demolition head 20 is illustrated as a rebar cutter (cutting unit 21) as an example.

[0020] The hydraulic device 10 includes, but is not limited to, the following structures: a hydraulic actuator 100, a hydraulic power unit 200, and an electric drive unit 300. Specifically, in this embodiment, the cutting unit 21, the hydraulic actuator 100, the hydraulic power unit 200, and the electric drive unit 300 are arranged and connected sequentially along the length direction (arrow X in the figure). Optionally, the cutting unit 21, the hydraulic actuator 100, the hydraulic power unit 200, and the electric drive unit 300 are arranged linearly along the length direction of the quick-break. This structural design facilitates operation in narrow and deep spaces (such as cave-like spaces), and features a compact structure and convenient operation.

[0021] Please refer to the following: Figure 3 , Figure 3 yes Figure 2 The schematic diagram of the dismantling structure of the demolition tool in this embodiment shows that the hydraulic actuation unit 100 is connected to the cutting head unit 21 and is used to drive the cutting head unit 21 to perform cutting actions. The hydraulic power unit 200 can input high-pressure hydraulic oil to the hydraulic actuation unit 100 under the drive of the electric drive unit 300, thereby driving the hydraulic actuation unit 100 to perform actions. This embodiment mainly describes the structure of the demolition head 20 as the cutting head unit 21. When the demolition head 20 is the cutting head unit 21, the demolition tool in this embodiment constitutes a quick-break structure.

[0022] Please refer to the following: Figure 4 , Figure 4 yes Figure 2 The embodiment shows a schematic diagram of the disassembled structure of the cutting unit. In this embodiment, the cutting unit 21 includes a base 21a, a first blade 21b, and a second blade 21c. The first blade 21b is detachably and fixedly connected to the base 21a. The second blade 21c is connected to the hydraulic actuator 100 and can move closer to or further away from the first blade 21b under the drive of the hydraulic actuator 100, thereby realizing the cutting of the object located between the first blade 21b and the second blade 21c. The object being cut is generally a strip structure, such as a steel bar.

[0023] Please refer to the following: Figure 5 , Figure 5 This is a schematic diagram of the split structure of an embodiment of the hydraulic actuator of this application. In this embodiment, the hydraulic actuator 100 includes a hydraulic cylinder 110 and a piston rod 120. One end of the piston rod 120 is inserted into the hydraulic cylinder 110, and the other end is connected to the second blade 21c. The hydraulic power unit 200 is used to pump hydraulic oil into the cavity of the hydraulic cylinder 110.

[0024] Alternatively, please continue reading Figure 4In this embodiment, the base 21a is provided with a clearance groove 21a1, which is used to accommodate or pass through the object to be cut. The clearance groove 21a1 includes a first sidewall 21a2 and a second sidewall 21a3 arranged opposite to each other. The first blade 21b is fixedly connected to the first sidewall 21a2. The second sidewall 21a3 is provided with a through hole. The piston rod 120 passes through the through hole and is connected to the second blade 21c, thereby driving the second blade 21c to move closer to or away from the first blade 21b, so as to cut the object between the two.

[0025] Optionally, please refer to the following as well. Figures 5 to 7 , Figure 6 This is a cross-sectional structural schematic diagram of an embodiment of the demolition tool of this application. Figure 7 yes Figure 6 In the enlarged structural schematic diagram at point A in the embodiment, the end of the base 21a away from the clearance groove 21a1 is provided at the mounting part 21a4 of the cylindrical structure. The mounting part 21a4 is connected to the hydraulic cylinder 110. The mounting part 21a4 and the hydraulic cylinder 110 cooperate to form a hydraulic chamber 1000. The piston rod 120 can slide along the hydraulic chamber 1000 under the action of hydraulic oil.

[0026] Optionally, please refer to the following as well. Figure 7 , Figure 8 as well as Figure 9 , Figure 8 This is a schematic diagram of the structure of the electric drive unit and the hydraulic power unit in this application. Figure 9 This is a schematic diagram showing the exploded structure of an embodiment of the hydraulic power unit of this application. In this embodiment, the hydraulic power unit 200 includes an axial piston pump, which is connected to the electric drive unit 300 and is used to pump hydraulic oil into the hydraulic chamber 1000 of the hydraulic actuator unit 100.

[0027] In this embodiment, the axial piston pump may include a first sleeve 210, a second sleeve 220, a central shaft 230, a swashplate 240, a pump body 250, and a piston 260. The two ends of the first sleeve 210 are connected to the hydraulic cylinder 110 of the hydraulic actuator 100 and the motor 310 of the electric drive unit 300, respectively. The first sleeve 210 forms the mounting space for the central shaft 230, swashplate 240, pump body 250, and piston 260. The second sleeve 220 is fitted around the outer periphery of the first sleeve 210, providing structural reinforcement and stability.

[0028] Optionally, the electric drive unit 300 in this embodiment includes a motor 310 and an electronic control component 320. The motor 310 is connected to the axial piston pump, and the electronic control component 320 is located on the side of the motor 310 away from the axial piston pump. The electronic control component 320 is used to control the motor 310.

[0029] Alternatively, please continue reading Figure 3 and Figure 6 In this embodiment, the electronic control component 320 may specifically include a housing 321, control buttons 322 disposed on the housing 321, and a control circuit board (not shown in the figure) disposed inside the housing 321. Detailed features of this part are within the understanding of those skilled in the art and will not be elaborated here.

[0030] Additionally, the demolition tool in this embodiment can be either plugged in or battery powered. Please refer to the following documentation for further details. Figure 3 and Figure 6 In this embodiment, the electric drive unit 300 may further include a battery 330, which is detachably connected to the electronic control component 320. The battery 330 is located on the side of the motor 310 away from the electronic control component 320, and is used to supply power to the electronic control component 320 and the motor 310. Specifically, the battery 330 may be a rechargeable lithium-ion battery.

[0031] Please continue reading. Figure 7 and Figure 8 The two ends of the central shaft 230 are connected to the motor 310 and the pump body 250, respectively; the plunger 260 is disposed inside the pump body 250; the swashplate 240 is sleeved on the central shaft 230 and supports the plunger 260, which is used to convert the rotational motion of the central shaft 230 into the reciprocating motion of the plunger 260. The reciprocating motion of the plunger 260 pressurizes the hydraulic oil in the pump body 250 and presses it into the hydraulic chamber 1000 of the hydraulic actuator 100 through the one-way valve 270.

[0032] Alternatively, please continue reading Figure 8 and Figure 9 The axial piston pump in this embodiment also includes a bearing 280, which is sleeved on the central shaft 230. The two ends of the bearing 280 support the swashplate 240 and the inner wall of the first sleeve 210, respectively. The bearing 280 is used to provide a supporting force to the swashplate 240 in the radial direction.

[0033] Please refer to the following: Figure 10 , Figure 10 This is a structural diagram of another state of the demolition tool of this application, wherein, in Figure 10 In this state, the piston rod 120 slides to the left along the hydraulic chamber 1000 under the action of hydraulic oil, thereby driving the second blade 21c to approach the first blade 21b, so as to cut the object located between the second blade 21c and the first blade 21b.

[0034] Alternatively, please continue reading Figures 1 to 3The demolition tool in this embodiment also includes a housing 30, which is fitted around at least a portion of the structure of the hydraulic power unit 200 and the electric drive unit 300. The housing 30 serves several purposes: firstly, it provides peripheral protection for the overall structure of the demolition tool, acting as a buffer and shock absorber; the material is generally plastic. Secondly, the housing 30 also serves a decorative function. Additionally, the front end of the housing 30 forms a handle 31 for easy gripping and use by the operator.

[0035] Optionally, please refer to the following as well. Figure 3 and Figure 11 , Figure 11 This is a partial cross-sectional view of another embodiment of the demolition tool of this application. In this embodiment, the hydraulic actuation unit 100 includes a hydraulic cylinder 110, a piston rod 120, and a return rod 130. One end of the hydraulic cylinder 110 is fitted with a base 21a to form a hydraulic cavity 1000. The piston rod 120 is inserted into the hydraulic cavity 1000 and can slide along the hydraulic cavity 1000. The other end of the hydraulic cylinder 110 is provided with an oil inlet channel 101. Figure 6 and Figure 10 As shown) and return oil channel 102 ( Figure 11 As shown in the figure, the two ends of the oil inlet channel 101 are connected to the pump body 250 of the hydraulic power unit 200 and the hydraulic chamber 1000, respectively.

[0036] The piston rod 120 includes a large end 121 and a small end 122, which are integral structures. The large end 121 is located in the hydraulic chamber 1000, and the small end 122 extends out of the hydraulic chamber 1000 and is connected to the second blade 21c.

[0037] Optionally, in this embodiment, the piston rod 120 is provided with a mounting cavity 1200 in the middle. The mounting cavity 1200 has an opening on the side near the large end 121. A limiting member 140 is provided at the opening position. A through hole 141 is provided in the middle of the limiting member 140. The return oil rod 130 passes through the through hole 141. The two ends of the return oil rod 130 are located in the mounting cavity 1200 of the piston rod 120 and the hydraulic cavity 1000, respectively.

[0038] The mounting cavity 1200 is connected to the hydraulic cavity 1000. One end of the return rod 130 is inserted into the mounting cavity 1200, and the other end passes through the limiting member 140 and extends outside the mounting cavity 1200. The return rod 130 can be sealed or opened. Figure 11 (In the open state) The connection port 1021 between the return oil channel 102 and the hydraulic chamber 1000 is used to achieve return oil control of the return oil channel 102. Please refer to the following: Figure 12 , Figure 12 This is a structural schematic diagram of another state of the hydraulic device in this embodiment, wherein, Figure 12In the intermediate state, the return oil rod 130 seals the connection port 1021 between the return oil channel 102 and the hydraulic chamber 1000, at which time the return oil channel 102 is closed.

[0039] Alternatively, please continue reading Figure 11 and Figure 12 In this embodiment, the hydraulic actuator 100 further includes a first reset member 150, which is sleeved on the outer periphery of the piston rod 120. The two ends of the first reset member 150 respectively abut against the inner wall of the hydraulic chamber 1000 and the large diameter (large end 121) of the piston rod 120. The first reset member 150 is used to achieve the reset action of the piston rod 120 to the right side of the figure. Optionally, the first reset member 150 in this embodiment can be a compression spring.

[0040] The hydraulic actuator 100 in this embodiment further includes a second reset member 160. The second reset member 160 is sleeved on the outer periphery of the return rod 130. The two ends of the second reset member 160 respectively abut against the flange 131 of the return rod 130 away from the return channel 102 and the port position of the mounting cavity 1200, specifically, they can abut against the limiting member 140. Please refer to... Figure 13 , Figure 13 This is a schematic diagram of an embodiment of the return rod of this application. The end of the return rod 130 away from the flange 131 is used to block or open the connection port 1021 between the return oil channel 102 and the hydraulic chamber 1000. The second reset member 160 in this embodiment can also be a compression spring structure.

[0041] The working principle of the hydraulic device in this embodiment is as follows: Initial state (e.g.) Figure 12 Under the action of the first reset member 150, the piston rod 120 is held against the right side wall of the hydraulic chamber 1000. At the same time, the bottom wall of the mounting cavity 1200 holds the end of the return rod 130, so that the return rod 130 seals the return oil passage 102. Then, the high-pressure hydraulic oil enters the hydraulic chamber 1000 through the oil inlet passage 101. Since the hydraulic chamber 1000 is connected to the mounting cavity 1200 of the piston rod 120, the hydraulic oil also enters the mounting cavity 1200 of the piston rod 120. On the one hand, the hydraulic oil holds the piston rod 120 to move to the left in the figure, driving the cutting unit 21 to complete the shearing operation. On the other hand, the hydraulic oil in the mounting cavity 1200 holds the end of the return rod 130 located in the mounting cavity 1200 and gives the return rod 130 a force to the right in the figure, so that the return rod 130 is held in place. Figure 12 The piston rod remains stationary, maintaining the state of blocking the return oil passage 102. As the piston rod 120 gradually moves to the left, the second reset member 160 is continuously compressed. When compressed to the limit (at which point the cutting unit 21 has achieved the alignment and cutting of the first blade 21b and the second blade 21c), the piston rod 120 will drive the return oil rod 130 to move to the left, thereby releasing the blockage of the return oil passage 102 by the return oil rod 130. Figure 11 In the middle state), the return oil passage 102 is open, and the hydraulic oil flows back and releases pressure along the return oil passage 102. At this time, the piston rod 120 moves to the right and resets under the action of the first reset member 150. At the same time, because there is a compression spring (second reset member 160) at the head of the return oil rod 130, the return oil rod 130 is prevented from falling back to the hard seal under the pressure equalization state. When the piston rod 120 drops to the bottom, the compression spring of the piston rod (first reset member 150) presses the return oil rod 130 down, restoring it to the middle state. Figure 12 In this intermediate state, a work cycle is completed. Among them, Figure 11 and Figure 12 The part marked 180 is an oil discharge nozzle. Oil discharge nozzle 180 is used to connect to an external oil collection device through an oil pipe to discharge hydraulic oil.

[0042] Alternatively, please continue reading Figure 3 , Figure 11 as well as Figure 12 In this embodiment, the hydraulic cylinder 110 is also provided with an oil unloading channel 103, which is connected to the hydraulic chamber 1000. The hydraulic actuator 100 also includes a control valve 170, which is connected to the oil unloading channel 103. The control valve 170 is used to control the opening and closing of the oil unloading channel 103. The control valve 170 can be a manual valve structure. By controlling the opening and closing of the oil unloading channel 103, the hydraulic oil can be maintained by manually returning oil or sealing the oil unloading channel 103.

[0043] The hydraulic device in this embodiment adopts a single-acting principle, and the retraction of the piston rod is completed by an elastic reset component. Compared with the traditional double-acting hydraulic device, it has the characteristics of simple structure, high reliability and low failure rate.

[0044] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A hydraulic device, characterized in that, The hydraulic device includes: a hydraulic actuator and a hydraulic power unit; The hydraulic actuator includes a hydraulic cylinder, a piston rod, and a return rod. One end of the hydraulic cylinder is surrounded to form a hydraulic cavity, and the piston rod is inserted into the hydraulic cavity and can slide along the hydraulic cavity. The other end of the hydraulic cylinder is provided with an oil inlet channel and an oil return channel, and the two ends of the oil inlet channel are respectively connected to the hydraulic power unit and the hydraulic chamber; The piston rod has a mounting cavity in the middle, which is connected to the hydraulic cavity. One end of the return oil rod is inserted into the mounting cavity, and the other end extends to the outside of the mounting cavity and can seal or open the connection between the return oil channel and the hydraulic cavity, thereby realizing the return oil control of the return oil channel.

2. The hydraulic device according to claim 1, characterized in that, The hydraulic actuator further includes a first reset member, which is sleeved on the outer periphery of the piston rod. The two ends of the first reset member respectively abut against the inner wall of the hydraulic chamber and the major diameter of the piston rod. The first reset member is used to reset the piston rod.

3. The hydraulic device according to claim 2, characterized in that, The hydraulic actuator further includes a second reset member, which is sleeved on the outer periphery of the return rod. The two ends of the second reset member respectively support the flange of the return rod away from the return channel and the port position of the mounting cavity.

4. The hydraulic device according to claim 3, characterized in that, Both the first reset element and the second reset element are compression springs.

5. The hydraulic device according to claim 1, characterized in that, The hydraulic cylinder is also provided with an oil unloading channel, which is connected to the hydraulic chamber. The hydraulic actuator also includes a control valve, which is connected to the oil unloading channel and is used to control the opening and closing of the oil unloading channel.

6. The hydraulic device according to claim 1, characterized in that, The hydraulic device also includes a base, which is connected to the hydraulic cylinder and cooperates with the hydraulic cylinder to form the hydraulic chamber.

7. The hydraulic device according to claim 1, characterized in that, The hydraulic device further includes an electric drive unit, which is connected to the hydraulic power unit and is used to drive the hydraulic power unit.

8. The hydraulic device according to claim 7, characterized in that, The hydraulic power unit includes an axial piston pump, and the electric drive unit includes a motor and an electronic control component. The motor is connected to the axial piston pump, and the electronic control component is connected to the motor. The motor can drive the axial piston pump to pump hydraulic oil into the hydraulic chamber.

9. The hydraulic device according to claim 8, characterized in that, The axial piston pump includes a central shaft, a swashplate, a pump body, and pistons; The central shaft is connected to the motor and the pump body at both ends, respectively; the plunger is disposed in the pump body; the swashplate is sleeved on the central shaft and supports the plunger, which is used to convert the rotational motion of the central shaft into the reciprocating motion of the plunger.

10. A demolition tool, characterized in that, The demolition tool includes a demolition head and a hydraulic device as described in any one of claims 1-9. The demolition head is connected to the hydraulic actuator of the hydraulic device and can perform demolition operations under the drive of the hydraulic actuator.

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