A power distribution cabinet installation device for a suspended power-saving device

Abstract

The application discloses a power distribution cabinet installation device for a suspension type power-saving equipment, and belongs to the related field of power distribution cabinets.The installation device comprises a first gear rack, the first gear rack is fixedly connected to the front face of a frame, a connecting plate bottom is fixedly connected with a fixed plate, the front face of the fixed plate is rotationally connected with a rotating rod through a bearing, the outer wall of the rotating rod is fixedly sleeved with a first circular gear, the rotating rod is movably penetrated through the fixed plate and extends to the back face, the back face of the rotating rod is fixedly connected with a second circular gear, and the inside of the connecting plate is slidably connected with a second gear rack.After the hydraulic cylinder is started, a series of mechanical connecting components (an output rod, a connecting plate, a fixed plate, a rotating rod, a first circular gear, a second circular gear, a second gear rack, a connecting rod, a supporting rod and a bearing rod) are driven to work cooperatively, the complexity and inconvenience of manual operation are avoided, automatic operation not only improves operation efficiency, but also avoids human errors, and use convenience is improved.

Description

Technical Field

[0001] This application relates to the field of power distribution cabinets, and more specifically, to a mounting device for a suspended power distribution cabinet for energy-saving equipment. Background Technology

[0002] Switchgear plays a crucial role in power systems. It is the core component of power distribution, responsible for receiving, distributing, and controlling electrical energy. Switchgear improves the reliability and security of power supply, optimizes the operating efficiency of the power system, reduces energy consumption, and minimizes line losses. Furthermore, switchgear offers advantages such as ease of maintenance, flexible installation, and strong adaptability, meeting diverse power demands. In modern construction, the application of switchgear has become an indispensable power facility, providing a stable power supply for social production and daily life. In short, as a key component of the power system, switchgear plays a vital role in the rational, efficient, and safe utilization of electrical energy. Its existence has greatly promoted the development of the power industry and met people's demand for high-quality power services. In future power systems, switchgear will continue to play an irreplaceable role, providing solid power support for sustainable social development. The importance of distribution cabinet suspension installation devices is mainly reflected in the following aspects. First, a reasonable suspension device can ensure the stability and safety of the distribution cabinet in various environments, preventing cabinet displacement or deformation caused by ground vibration or temperature changes. Second, a good installation device helps improve the working efficiency of the distribution cabinet. A stable suspension system can effectively reduce the loosening of internal electrical connections caused by cabinet shaking, reducing the possibility of failure. In addition, in the long run, a scientific suspension device can extend the service life of the distribution cabinet. It can not only reduce the frequency of maintenance and replacement, thus saving costs, but also ensure the continuity and stability of power supply, providing better services for social production and life. In summary, selecting and designing a reasonable distribution cabinet suspension installation device is an important link in ensuring the stable, safe, and efficient operation of power equipment. Therefore, a suspension-type power-saving equipment distribution cabinet installation device is particularly needed.

[0003] Patent document CN117856083A discloses a suspended power distribution cabinet installation device, including a connecting plate, a fixing plate, a motor, a rotating rod, a take-up reel, a connecting rope, a hook, a connecting groove, a lifting groove, a lifting plate, and a connecting buckle. This suspended power distribution cabinet installation device, combined with an electric lift, offers significant advantages. The electric lift greatly simplifies the installation process, reduces the difficulty and intensity of manual operation, and lowers labor costs. Precise lifting control ensures the distribution cabinet maintains a suitable distance from the ground, facilitating wiring connections and maintenance. The electric lift is more flexible, adapting to different heights and enhancing the device's versatility. It also effectively reduces installation time, improves work efficiency, and brings greater economic benefits to users, significantly lowering overall costs and bringing greater economic benefits to the power industry. While the aforementioned application document also mentions that the electric lift effectively reduces installation time, improves work efficiency, and brings greater economic benefits, it requires lowering the distribution box before manually pressing a button to remove it, making it less convenient to use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a suspended power distribution cabinet installation device for energy-saving equipment, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this application provides a suspended power distribution cabinet installation device, including a frame, an installation device assembled inside the frame, a lifting device assembled inside the frame, the lifting device including a hydraulic cylinder, an output rod fixedly connected to the bottom of the output end of the hydraulic cylinder, the output rod movably extending through the frame to the bottom, a connecting plate fixedly connected to the bottom of the output end of the output rod, a power distribution box assembled on the inner wall of the frame, and a lifting ring fixedly connected to the top of the power distribution box;

[0006] The mounting device includes a first rack, which is fixedly connected to the front of the frame. A fixing plate is fixedly connected to the bottom of the connecting plate. A rotating rod is rotatably connected to the front of the fixing plate via a bearing. A first spur gear is fixedly sleeved on the outer wall of the rotating rod. The rotating rod extends movably through the fixing plate to the back. A second spur gear is fixedly connected to the back of the rotating rod. A second rack is slidably connected inside the connecting plate. A connecting rod is fixedly connected to the front of the second rack. A support rod is fixedly connected to the side of the connecting rod. A load-bearing rod is fixedly connected to the side of the support rod. The first spur gear meshes with the first rack, and the second spur gear meshes with the second rack.

[0007] Preferably, the connecting plate has a groove for sliding the connecting rod, and the side of the support rod has a through hole for sliding the load-bearing rod.

[0008] Preferably, the side of the load-bearing rod is provided with an inclined surface for the sliding of the lifting ring.

[0009] Preferably, the frame is equipped with a protective device, which includes a limiting groove. The limiting groove is formed at the bottom of the inner wall of the frame. A protective box is fixedly connected to the top of the limiting groove. A V-shaped rod is hinged to the inner wall of the protective box. A spring is fixedly connected to the bottom of the V-shaped rod.

[0010] Preferably, a first hydraulic chamber is fixedly connected to the bottom of the inner wall of the frame, a first hydraulic rod is slidably connected to a piston at one end inside the first hydraulic chamber, a second hydraulic rod is slidably connected to a piston at one end inside the first hydraulic chamber, and a limit block is fixedly connected to the side of the first hydraulic chamber, the limit block being in contact with the side of the V-shaped rod.

[0011] Preferably, the included angle of the V-shaped rod is less than 90 degrees.

[0012] Preferably, the frame is equipped with a stabilizing device, which includes a second hydraulic chamber fixedly connected to the bottom of the inner wall of the protective box. A third hydraulic rod is slidably connected to one end of the second hydraulic chamber by a piston. A third hydraulic chamber is fixedly connected to the inside of the V-shaped rod. A fourth hydraulic rod is slidably connected to one end of the third hydraulic chamber by a piston. A clamping rod is fixedly connected to the side of the fourth hydraulic rod.

[0013] Preferably, a connecting hose is fixedly connected to the side of the second hydraulic chamber, and the end of the connecting hose away from the second hydraulic chamber is fixedly connected to the third hydraulic chamber. The protective box is provided with two sets of second hydraulic chambers, third hydraulic rods, and fourth hydraulic rods.

[0014] The advantages of this application are:

[0015] I. This application, through the installation of a device, drives a series of mechanical connecting parts (output rod, connecting plate, fixed plate, rotating rod, first spur gear, second spur gear, second rack, connecting rod, support rod, load-bearing rod) to work together after the hydraulic cylinder is started, avoiding the complexity and inconvenience of manual operation. Automated operation not only improves operating efficiency, but also avoids human error and improves ease of use.

[0016] Second, this application employs a protective device with a V-shaped rod design. After the distribution box descends, the V-shaped rod rotates counterclockwise under gravity and secures the side of the distribution box, providing a self-locking function and effectively solving the instability problem that may occur after the distribution box descends. Furthermore, the V-shaped rod combined with a spring design ensures that after the distribution box rises, the V-shaped rod can reset to the optimal protection angle, thus providing sufficient protection for the distribution box.

[0017] Third, this application utilizes a stabilizing device. During the descent of the distribution box, the third hydraulic rod, in conjunction with the V-shaped rod, provides stable support. Once the distribution box is fully on the ground, the fourth hydraulic rod further engages the clamping rod, securing the distribution box to the ground and preventing movement due to vibration or other factors during use. This design enhances the stability and safety of the distribution box, preventing potential tilting or instability after descent. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a partial structural diagram of the present invention. Figure 1 ;

[0021] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0022] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B;

[0023] Figure 5 For the present invention Figure 2 Enlarged structural diagram at point C;

[0024] Figure 6 This is a partial structural diagram of the present invention. Figure 2 ;

[0025] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point D.

[0026] In the above image,

[0027] 1. Frame; 2. Mounting device; 21. First rack; 22. Fixing plate; 23. Rotating rod; 24. First spur gear; 25. Second spur gear; 26. Second rack; 27. Connecting rod; 28. Support rod; 29. ​​Load-bearing rod; 3. Protective device; 31. Limiting groove; 32. First hydraulic chamber; 33. First hydraulic rod; 34. Second hydraulic rod; 35. Protective box; 36. V-shaped rod; 37. Limiting block; 38. Spring; 4. Stabilizing device; 41. Second hydraulic chamber; 42. Third hydraulic rod; 43. Connecting hose; 44. Third hydraulic chamber; 45. Fourth hydraulic rod; 46. Clamping rod; 5. Lifting device; 51. Hydraulic cylinder; 52. Output rod; 53. Connecting plate; 6. Distribution box; 7. Lifting ring. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] See Figures 1-5 This embodiment provides a suspended power distribution cabinet installation device, including a frame 1, an installation device 2 and a lifting device 5 inside the frame 1, a hydraulic cylinder 51 providing powerful force, and an output rod 52 and a connecting plate 53 forming a linear transmission mechanism to achieve precise adjustment of the distribution box 6. The lifting device 5 includes a hydraulic cylinder 51, with an output rod 52 fixedly connected to the bottom of the output end of the hydraulic cylinder 51. The output rod 52 extends movably through the frame 1 to the bottom, and a connecting plate 53 is fixedly connected to the bottom of the output end of the output rod 52. The distribution box 6 is installed on the inner wall of the frame 1, and a lifting ring 7 is fixedly connected to the top of the distribution box 6. The frame 1 contains the installation device 2 and the lifting device 5. The lifting device 5, composed of a hydraulic cylinder 51, transmits motion to the connecting plate 53 through the output rod 52 to achieve vertical adjustment of the distribution box 6. The installation device 2 can drive the connecting plate 53 through a rotation mechanism to further adjust the position of the distribution box 6.

[0036] The mounting device 2 includes a first rack 21, which is fixedly connected to the front of the frame 1. A fixing plate 22 is fixedly connected to the bottom of the connecting plate 53. A rotating rod 23 is rotatably connected to the front of the fixing plate 22 via a bearing. A first spur gear 24 is fixedly sleeved on the outer wall of the rotating rod 23. The rotating rod 23 extends movably through the fixing plate 22 to the back. A second spur gear 25 is fixedly connected to the back of the rotating rod 23. A second rack 26 is slidably connected inside the connecting plate 53. A connecting rod 27 is fixedly connected to the front of the second rack 26. A support rod 28 is fixedly connected to the side of the connecting rod 27. A load-bearing rod 29 is fixedly connected to the side of the support rod 28. The first spur gear 24 meshes with the first rack 21, and the second spur gear 25 meshes with the second rack 26. A sliding groove for the first rack 21 is opened on the side of the frame 1. The connecting plate 53 has a groove for the sliding of the connecting rod 27, and the support rod 28 has a through hole for the sliding of the load-bearing rod 29. The support rod 28 has a through hole to allow the load-bearing rod 29 to slide smoothly and work in conjunction with other components. The load-bearing rod 29 has an inclined surface on its side for the sliding of the lifting ring 7. To ensure that the load-bearing rod 29 can stably cooperate with the lifting ring 7 and effectively bear the weight of the distribution box 6, the load-bearing rod 29 can slide freely with the lifting ring 7 during the descent, avoiding jamming and enhancing the stability and durability of the structure. By starting the hydraulic cylinder 51, a series of mechanical connecting parts (output rod 52, connecting plate 53, fixing plate 22, rotating rod 23, first spur gear 24, second spur gear 25, second rack 26, connecting rod 27, support rod 28, load-bearing rod 29) work together, enabling the distribution box 6 to automatically descend and land. When the load-bearing rod 29 has completely moved to the side of the lifting ring 7, the distribution box 6 is no longer limited, realizing the automatic release of control over the distribution box 6.

[0037] In practical use, the above equipment is activated by starting the hydraulic cylinder 51, which drives the output rod 52 to descend. The output rod 52 drives the connecting plate 53 to descend, which in turn drives the fixed plate 22 to descend. The fixed plate 22 drives the rotating rod 23 to descend, which in turn drives the first sprocket 24 to descend. The first sprocket 24 rotates counterclockwise through the first rack 21. The first sprocket 24 drives the rotating rod 23 to rotate counterclockwise, which in turn drives the second sprocket 25 to rotate counterclockwise. The second sprocket 25 drives the second rack 26 to move to the right, which in turn drives the connecting rod 27 to move to the right. The connecting rod 27 drives the support rod 28 to move to the right, which in turn drives the load-bearing rod 29 to move to the right. When the load-bearing rod 29 has completely moved to the side of the lifting ring 7 and no longer limits the lifting ring 7, the distribution box 6 is also completely lowered to the ground, thus automatically releasing control of the distribution box 6 upon landing.

[0038] Example 2

[0039] See Figures 1-7 Based on Embodiment 1, a protective device 3 is installed inside the frame 1. The protective device 3 consists of a limiting groove 31 and a V-shaped rod 36. The V-shaped rod 36 provides restoring force through a spring 38 to help protect the distribution box 6 from damage. The protective device 3 includes a limiting groove 31, which is opened at the bottom of the inner wall of the frame 1. A protective box 35 is fixedly connected to the top of the limiting groove 31. A V-shaped rod 36 is hinged to the inner wall of the protective box 35. The V-shaped rod 36 can automatically fix the distribution box 6 when it is lowered to prevent the distribution box 6 from shaking excessively. A spring 38 is fixedly connected to the bottom of the V-shaped rod 36, which automatically resets the distribution box 6 and provides further safety protection. A first hydraulic chamber 32 is fixedly connected to the bottom of the inner wall of the frame 1. A first hydraulic rod 33 is slidably connected to a piston at one end of the first hydraulic chamber 32. A second hydraulic rod 34 is slidably connected to a piston at one end of the first hydraulic chamber 32. A limiting block 37 is fixedly connected to the side of the first hydraulic chamber 32, and the limiting block 37 fits against the side of the V-shaped rod 36. The included angle of the V-shaped rod 36 is less than 90 degrees. This design helps to better secure the distribution box 6 after it is lowered, preventing it from tilting or being disturbed by external forces. By reducing the included angle of the V-shaped rod 36, it ensures that the V-shaped rod 36 can make more stable contact with the distribution box 6, while increasing the fixing force, thereby improving the safety and stability of the overall device. After the distribution box 6 is lowered, the bottom of the V-shaped rod 36 is pressed by gravity, causing the V-shaped rod 36 to rotate counterclockwise and fix the side of the distribution box 6. After maintenance, the distribution box 6 is raised, the spring 38 drives the V-shaped rod 36 to return to its original position, and the limit block 37 ensures that the V-shaped rod 36 maintains the optimal angle, which facilitates the protection of the distribution box 6.

[0040] In practical use, after the distribution box 6 descends, gravity presses the bottom of the V-shaped rod 36, causing the V-shaped rod 36 to rotate counterclockwise around the hinge point. The top of the V-shaped rod 36 is fixed to the side of the distribution box 6. At the same time, the V-shaped rod 36 compresses the spring 38 when it descends. After maintenance, when the distribution box 6 rises, it no longer compresses the V-shaped rod 36. The spring 38 drives the V-shaped rod 36 to return to its original position. At the same time, the limiting block 37 makes the V-shaped rod 36 present the optimal angle, which is convenient for protecting the distribution box 6.

[0041] Example 3

[0042] See Figures 1-7Based on Embodiment 1, a stabilizing device 4 is installed inside the frame 1. The stabilizing device 4 includes a second hydraulic chamber 41, which is fixedly connected to the bottom of the inner wall of the protective box 35. A third hydraulic rod 42 is slidably connected to one end of the second hydraulic chamber 41 by a piston. A third hydraulic chamber 44 is fixedly connected inside the V-shaped rod 36. A fourth hydraulic rod 45 is slidably connected to one end of the third hydraulic chamber 44 by a piston. A clamping rod 46 is fixedly connected to the side of the fourth hydraulic rod 45. A connecting hose 43 is fixedly connected to the side of the second hydraulic chamber 41, and the second hydraulic chamber 41 and the third hydraulic chamber 44 are linked together through the connecting hose 43. To ensure that the pressure in the hydraulic system is properly distributed when the stabilizing device 4 is in operation, thereby improving the stability of the distribution box 6, the end of the connecting hose 43 away from the second hydraulic chamber 41 is fixedly connected to the third hydraulic chamber 44. The protective box 35 is equipped with two sets of second hydraulic chambers 41, third hydraulic rods 42, third hydraulic chambers 44, and fourth hydraulic rods 45. When the V-shaped rod 36 descends, it squeezes the third hydraulic rod 42, causing the internal pressure of the hydraulic system to increase, which drives the fourth hydraulic rod 45 and the clamping rod 46 to move backward, fixing the distribution box 6 after it is landed, further improving the stability of the distribution box 6 and ensuring the safety of the distribution box 6 after it is landed.

[0043] When the above-mentioned equipment is used, when the V-shaped rod 36 descends and squeezes the third hydraulic rod 42, the internal pressure of the second hydraulic chamber 41, the connecting hose 43, and the third hydraulic chamber 44 increases during the descent of the third hydraulic rod 42, which drives the fourth hydraulic rod 45 to move to the back. The fourth hydraulic rod 45 drives the clamping rod 46 to move to the back to fix the distribution box 6 after it is landed, further improving the stability of the distribution box 6.

[0044] In specific use, the above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A suspended power distribution cabinet installation device, comprising a frame (1), an installation device (2) is installed inside the frame (1), a lifting device (5) is installed inside the frame (1), the lifting device (5) comprises a hydraulic cylinder (51), an output rod (52) is fixedly connected to the bottom of the output end of the hydraulic cylinder (51), the output rod (52) extends movably through the frame (1) to the bottom, a connecting plate (53) is fixedly connected to the bottom of the output end of the output rod (52), a distribution box (6) is installed on the inner wall of the frame (1), and a lifting ring (7) is fixedly connected to the top of the distribution box (6); Its features are, The mounting device (2) includes a first rack (21), which is fixedly connected to the front of the frame (1). A fixing plate (22) is fixedly connected to the bottom of the connecting plate (53). A rotating rod (23) is rotatably connected to the front of the fixing plate (22) via a bearing. A first spur gear (24) is fixedly sleeved on the outer wall of the rotating rod (23). The rotating rod (23) extends movably through the fixing plate (22) to the back. A second spur gear (25) is fixedly connected to the back of the rotating rod (23). A second rack (26) is slidably connected inside the connecting plate (53). A connecting rod (27) is fixedly connected to the front of the second rack (26). A support rod (28) is fixedly connected to the side of the connecting rod (27). A load-bearing rod (29) is fixedly connected to the side of the support rod (28). The first spur gear (24) meshes with the first rack (21), and the second spur gear (25) meshes with the second rack (26). The frame (1) is equipped with a protective device (3). The protective device (3) includes a limiting groove (31). The limiting groove (31) is opened at the bottom of the inner wall of the frame (1). A protective box (35) is fixedly connected to the top of the limiting groove (31). A V-shaped rod (36) is hinged to the inner wall of the protective box (35). A spring (38) is fixedly connected to the bottom of the V-shaped rod (36). The bottom of the inner wall of the frame (1) is fixedly connected to a first hydraulic chamber (32). A first hydraulic rod (33) is slidably connected to a piston at one end inside the first hydraulic chamber (32). A second hydraulic rod (34) is slidably connected to a piston at one end inside the first hydraulic chamber (32). A limit block (37) is fixedly connected to the side of the first hydraulic chamber (32). The limit block (37) is in contact with the side of the V-shaped rod (36).

2. The installation device for a suspended power distribution cabinet for energy-saving equipment according to claim 1, characterized in that, The connecting plate (53) has a groove for sliding the connecting rod (27), and the side of the support rod (28) has a through hole for sliding the load-bearing rod (29).

3. The installation device for a suspended power distribution cabinet for energy-saving equipment according to claim 1, characterized in that, The side of the load-bearing rod (29) is provided with an inclined surface for the sliding of the lifting ring (7).

4. The installation device for a suspended power-saving equipment distribution cabinet according to claim 3, characterized in that, The included angle of the V-shaped rod (36) is less than 90 degrees.

5. The installation device for a suspended power distribution cabinet for energy-saving equipment according to claim 1, characterized in that, The frame (1) is equipped with a stabilizing device (4), which includes a second hydraulic chamber (41). The second hydraulic chamber (41) is fixedly connected to the bottom of the inner wall of the protective box (35). A third hydraulic rod (42) is slidably connected to one end of the second hydraulic chamber (41) by a piston. A third hydraulic chamber (44) is fixedly connected to the inside of the V-shaped rod (36). A fourth hydraulic rod (45) is slidably connected to one end of the third hydraulic chamber (44) by a piston. A clamping rod (46) is fixedly connected to the side of the fourth hydraulic rod (45).

6. The installation device for a suspended power distribution cabinet for energy-saving equipment according to claim 5, characterized in that, The second hydraulic chamber (41) is fixedly connected to a connecting hose (43) on its side. The end of the connecting hose (43) away from the second hydraulic chamber (41) is fixedly connected to the third hydraulic chamber (44). The protective box (35) is provided with two sets of second hydraulic chambers (41), third hydraulic rods (42), third hydraulic chambers (44), and fourth hydraulic rods (45).

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