Emergency rescue forcible entry device and forcible entry method thereof

Abstract

The invention discloses an emergency rescue forcible entry device and a forcible entry method thereof, and relates to the technical field of emergency rescue, the emergency rescue forcible entry device comprises a hydraulic unit, and the hydraulic unit comprises a hydraulic cylinder, an outer through pipe arranged on the outer side of the hydraulic cylinder and an oil return pipe arranged at the tail of the hydraulic cylinder. And the outer expansion unit comprises a connecting block and expansion arms symmetrically and rotatably connected to the two sides of the connecting block, one end of each expansion arm is rotatably connected with the head end of the hydraulic cylinder through a connecting rod, and the connecting block is driven by the hydraulic cylinder. The inner supporting unit comprises inner reinforcing supporting rods fixedly connected to the inner sides of the expansion arms, an auxiliary supporting mechanism is arranged between the inner reinforcing supporting rods on the two sides, and the auxiliary supporting mechanism is driven through the hydraulic cylinder. According to the device, different pistons are pushed in a graded mode, so that the expansion arms can complete expansion forcible entry work, meanwhile, internal supporting can be conducted according to the actual situation, the situation that the end of the expansion part of the device is deformed due to too large stress is avoided, and the good stabilizing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency rescue, and in particular to an emergency rescue breaking and demolition device and a breaking and demolition method thereof. Background Art

[0002] Emergency rescue demolition devices are widely used in emergency rescue processes, especially in dealing with emergencies such as traffic accidents and building collapses. They can quickly cut, expand and demolish obstacles to help rescuers quickly enter trapped areas. Among them, a common demolition device adopts a scissor-shaped structure, which drives the expansion of the scissor arm through the direct drive of the hydraulic cylinder to demolish the target object. This type of device is widely used because of its simple structure, easy operation and strong demolition force.

[0003] However, in the long-term actual use process, this type of scissor-shaped demolition device has exposed some technical defects. Because the ends of the scissor arms are subjected to large external forces when they are working, especially during the long expansion process. This external force is concentrated at the end of the scissor arm, which can easily cause it to undergo plastic deformation or fatigue damage, thereby affecting the demolition performance of the device and even failing to complete emergency tasks at critical moments. Deformation will not only affect the expansion effect of the scissor arm, but will also increase subsequent maintenance costs and shorten the service life of the device. Therefore, how to effectively improve the deformation resistance of the scissor arm, especially to support and strengthen it during expansion work, has become a technical problem that needs to be solved urgently.

[0004] To address this problem, existing emergency rescue devices lack technical means to further support and stabilize the scissor arms after expansion. Therefore, a new design is needed that can provide additional support after the scissor arms are expanded to reduce deformation caused by the end force and improve the durability and working reliability of the device. This will not only help improve the rescue efficiency of the rescue device, but also extend the service life of the equipment and reduce maintenance costs. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the problems existing in the above-mentioned existing emergency rescue breaking and demolition device and breaking and demolition method, the present invention is proposed.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: An emergency rescue and demolition device, comprising: The hydraulic unit comprises: a hydraulic cylinder, an external through pipe arranged outside the hydraulic cylinder and an oil return pipe at the tail of the hydraulic cylinder.

[0008] The external expansion unit comprises: a connection block, and expansion arms symmetrically rotatably connected to both sides of the connection block, one end of the expansion arm is rotatably connected to the head end of a hydraulic cylinder through a connection rod, and the connection block is driven by the hydraulic cylinder.

[0009] The inner support unit comprises: an inner reinforcing support rod fixedly connected to the inner side of the expansion arm, an auxiliary support mechanism is arranged between the inner reinforcing support rods on both sides, and the auxiliary support mechanism is also driven by a hydraulic cylinder.

[0010] As a preferred embodiment of the emergency rescue and demolition device described in the present invention, wherein: The inner side of the hydraulic cylinder is slidably connected with a main push piston and a secondary piston, and the inner side of the hydraulic cylinder is also fixedly connected with a sealing partition. The hydraulic cylinder is separated into a main push cavity, a buffer cavity, and a secondary cavity by the main push piston, the sealing partition, and the secondary piston; Among them, the external communication tube is used for communication between the main push cavity and the secondary cavity, a vent hole is opened in the buffer cavity, a main push piston rod is fixedly connected to the main push piston, the upper end of the main push piston rod is fixedly connected to the connecting block, a secondary piston rod is fixedly inserted into the secondary piston, the secondary piston rod slides through the main push piston and the main push piston rod, and a hollow hole is opened in the secondary piston rod.

[0011] As a preferred solution of the emergency rescue and demolition device described in the present invention, the auxiliary support mechanism includes: a disc-shaped support tube, both sides of the disc-shaped support tube are rotatably connected with connecting elbow tubes, a sleeve is fixedly connected to the connecting elbow tube, a movable sleeve rod is slidably inserted on the sleeve, one end of the movable sleeve rod is fixedly connected with a spherical support head, and a first push piston is provided in the sleeve.

[0012] As a preferred solution of the emergency rescue and demolition device described in the present invention, the cross end of the inner reinforcing support rod is fixedly connected with a C-shaped part, a limiting groove is provided on the C-shaped part, and the spherical support head is located on the inner side of the C-shaped part.

[0013] As a preferred solution of the emergency rescue and demolition device described in the present invention, the second secondary piston rod is slidably connected with a second push piston, the second push piston is fixedly connected with a push rod, the push rod is fixedly connected to the disc-shaped support tube, and the inside of the push rod is connected to the disc-shaped support tube through a through hole.

[0014] As a preferred embodiment of the emergency rescue and demolition device described in the present invention, the butt ends of the disc-shaped support tube and the connecting elbow tube are respectively provided with opening A and opening B, and when the sleeve is rotated to a horizontal alignment state, opening A and opening B are completely aligned.

[0015] As a preferred solution of the emergency rescue and demolition device described in the present invention, the expansion arm consists of two parts, an arc-shaped part and a supporting part, and the surface of the arc-shaped part is provided with anti-slip teeth, and the two ends of the internal reinforcing support rod are respectively fixedly connected to the inner sides of the arc-shaped part and the supporting part.

[0016] As a preferred solution of the emergency rescue and demolition device described in the present invention, wherein: a two-way solenoid valve and a three-way solenoid valve are respectively arranged on the oil return pipe and the external connecting pipe, and an oil inlet port is arranged on one side of the three-way solenoid valve. When the main pushing work of the main pushing piston is in progress, the two-way solenoid valve is normally open, and the three-way solenoid valve passes to the main pushing cavity. When the secondary pushing work of the secondary piston is in progress, the two-way solenoid valve is normally closed, and the three-way solenoid valve passes to the secondary cavity.

[0017] As a preferred solution of the emergency rescue and demolition device described in the present invention, the outer side of the hydraulic cylinder is symmetrically fixedly connected with an auxiliary support frame, and a holding frame is fixedly connected between the auxiliary support frames on both sides.

[0018] The above-mentioned method for dismantling an emergency rescue dismantling device comprises the following steps: Step 1: Move the device to the designated demolition location and start the hydraulic cylinder, that is, transport hydraulic oil into the main push cavity through the external pipe, thereby pushing the main push piston to slide upward, and then the connecting block moves forward to drive the expansion arm to perform demolition and expansion work.

[0019] Step 2: When the specified expansion angle is reached, the three-way solenoid valve passage is changed so that the hydraulic oil flows into the secondary cavity, pushing the secondary piston to slide upward to compress the space of the buffer cavity. At this time, the hydraulic oil will also push the push rod to drive the disc support tube to move upward.

[0020] Step 3: When the disc support tube moves upward, the movable sleeve rod slides adaptively in the sleeve and rotates as a whole until the movable sleeve rod contacts the edge side wall of the limit groove. At this time, the sleeves and movable sleeve rods on both sides are horizontally aligned. At the same time, since opening B is finally aligned with opening A during the rotation process, hydraulic oil enters the inside of the sleeve, thereby pushing the first push piston against the movable sleeve rod, thereby connecting the inner reinforcing rods on both sides to form a good internal support, thereby increasing the stability of the device.

[0021] The beneficial effects of the present invention are as follows: by connecting an internal reinforcing strut between the arc-shaped portion and the inner side of the supporting portion, a good reinforcing supporting effect is formed, and when the hydraulic cylinder is working, by pushing different pistons in stages, the expansion arm can not only complete the expansion and demolition work, but also perform internal support according to actual conditions, thereby avoiding deformation of the end of the expansion part of the device due to excessive force, and having a good stabilizing effect, thereby improving the demolition efficiency of the rescue device, and also extending the service life of the equipment and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 This is a schematic diagram of the overall structure of one side of an emergency rescue and demolition device proposed by the present invention; Figure 2 This is a schematic diagram of the overall structure of the other side of an emergency rescue and demolition device proposed by the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 This is a schematic diagram of the internal structure of a hydraulic cylinder of an emergency rescue and demolition device proposed by the present invention; Figure 5 It is a schematic diagram of the relative rotation process between the connecting end faces of the disc support tube and the connecting elbow tube; Figure 6 This is a schematic diagram of the structure of an emergency rescue and demolition device in an initial state proposed by the present invention; Figure 7 This is a structural schematic diagram of an emergency rescue and demolition device in a supporting state proposed by the present invention; Figure 8 This is a schematic diagram of the matching structure of the secondary piston rod and the ejector rod in an emergency rescue and demolition device proposed by the present invention; Fig. 9 The present invention provides a schematic diagram of the internal cross-sectional structure of a sleeve in an emergency rescue and demolition device.

[0023] In the figure: 100-hydraulic unit, 101-hydraulic cylinder, 102-holding frame, 103-external pipe, 103a-oil inlet port, 104-main push piston, 105-main push piston rod, 106-secondary piston, 107-secondary piston rod, 108-main push cavity, 109-secondary cavity, 110-return oil pipe, 111-two-way solenoid valve, 112-three-way solenoid valve, 113-sealed partition, 114-buffer cavity, 200-external expansion unit, 201-expansion arm, 201a-arc-shaped portion, 201b-support portion, 202-connecting block, 203-connecting rod, 300-inner supporting unit, 301-disc-shaped support tube, 301a-opening A, 302-connecting elbow tube, 302a-opening B, 303-sleeve, 303a-first pushing piston, 304-movable sleeve rod, 305-spherical support head, 306-C-shaped part, 306a-limiting groove, 307-inner reinforcing support rod, 308-pushing rod, 309-second pushing piston. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Reference Figure 1-Figure 9 , which is an embodiment of the present invention, provides an emergency rescue and demolition device, which includes: a hydraulic unit 100, an external expansion unit 200 and an internal support unit 300.

[0028] The hydraulic unit 100 includes: a hydraulic cylinder 101, an external pipe 103 arranged outside the hydraulic cylinder 101, and an oil return pipe 110 at the tail of the hydraulic cylinder 101; the front part of the hydraulic cylinder 101 also has an oil inlet port for the retraction of the hydraulic cylinder, and the oil return pipe 110 and the external pipe 103 are respectively provided with a two-way solenoid valve 111 and a three-way solenoid valve 112, and one side of the three-way solenoid valve 112 is provided with an oil inlet port 103a. When the main push of the main push piston 104 is in progress, the two-way solenoid valve 111 is normally open, and the three-way solenoid valve 112 is passed to the main push cavity 108. When the secondary push of the secondary piston 106 is in progress, the two-way solenoid valve 111 is normally closed, and the three-way solenoid valve 112 is passed to the secondary cavity 109. Control the passage environment in different operation steps to achieve the working requirements of different pistons. The outer side of the hydraulic cylinder 101 is symmetrically fixedly connected with an auxiliary support frame, and the holding frame 102 is fixedly connected between the auxiliary support frames on both sides. It is convenient for the staff to grasp and operate.

[0029] Specifically, the inner side of the hydraulic cylinder 101 is slidably connected with the main push piston 104 and the secondary piston 106, and the inner side of the hydraulic cylinder 101 is also fixedly connected with the sealing partition 113, and the main push piston 104, the sealing partition 113, and the secondary piston 106 separate the hydraulic cylinder 101 into a main push cavity 108, a buffer cavity 114, and a secondary cavity 109; Among them, the external communication tube 103 is used for the communication between the main push cavity 108 and the secondary cavity 109, a vent hole is provided in the buffer cavity 114, a main push piston rod 105 is fixedly connected to the main push piston 104, the upper end of the main push piston rod 105 is fixedly connected to the connecting block 202, a secondary piston rod 107 is fixedly inserted into the secondary piston 106, the secondary piston rod 107 slides through the main push piston 104 and the main push piston rod 105, and a hollow hole is provided in the secondary piston rod 107. The two pistons control different external motions respectively, cooperate with each other, and realize external support and internal support under different passage conditions, thereby improving the stability of the device.

[0030] The external expansion unit 200 includes: a connection block 202, an expansion arm 201 symmetrically connected to both sides of the connection block 202, one end of the expansion arm 201 is connected to the head end of the hydraulic cylinder 101 through a connection rod 203, the connection block 202 is driven by the hydraulic cylinder 101, the expansion arm 201 includes an arc portion 201a and a support portion 201b, and the surface of the arc portion 201a is provided with anti-slip teeth, and the two ends of the internal reinforcement support rod 307 are respectively fixedly connected to the inner side of the arc portion 201a and the support portion 201b. The internal reinforcement support rod 307 itself can form an internal support reinforcement structure between the arc portion 201a and the support portion 201b.

[0031] The inner support unit 300 includes: an inner reinforcing support rod 307 fixedly connected to the inner side of the expansion arm 201 , an auxiliary support mechanism is arranged between the inner reinforcing support rods 307 on both sides, and the auxiliary support mechanism is also driven by the hydraulic cylinder 101 .

[0032] Specifically, the auxiliary support mechanism includes: a disc support tube 301, the two sides of the disc support tube 301 are rotatably connected with connecting elbow tubes 302, the connecting elbow tube 302 is fixedly connected with a sleeve 303, the sleeve 303 is slidably inserted with a movable sleeve rod 304, one end of the movable sleeve rod 304 is fixedly connected with a spherical support head 305, and a first push piston 303a is arranged in the sleeve 303. After the external expansion is completed, the internal support work is called, that is, the spherical support head 305 is stuck on the inner side of the C-mouth of the C-shaped member 306, so that the auxiliary support mechanism forms a straight line. At this time, the first push piston 303a will tightly press the movable sleeve rod 304 under the action of hydraulic pressure to ensure that a stable linear support effect is formed between the C-shaped members 306 on both sides.

[0033] In addition, the cross end of the inner reinforcing support rod 307 is fixedly connected with a C-shaped piece 306, and a limit groove 306a is provided on the C-shaped piece 306, and the spherical support head 305 is located inside the C-shaped piece 306. When the movable sleeve rod 304 rotates outward to the outside of the limit groove 306a, it means that the sleeve 303 has been horizontally positioned, and a second push piston 309 is slidably connected inside the secondary piston rod 107, and a push rod 308 is fixedly connected to the second push piston 309. The push rod 308 is fixedly connected to the disc support tube 301, and the inside of the push rod 308 is connected to the disc support tube 301 through a through hole. Hydraulic oil can be continuously passed into the sleeve 303 to provide hydraulic pressure under the premise that the passage remains connected.

[0034] Specifically, the butt ends of the disc support tube 301 and the connecting elbow tube 302 are respectively provided with an opening A301a and an opening B302a. When the sleeve 303 is rotated to a horizontal alignment state, the opening A301a and the opening B302a are completely aligned. Figure 7 , only in Figure 7 Only in the supporting state can the two holes be completely aligned and the hydraulic pressure can be sufficient to press against the first push piston 309 in the sleeve 303.

[0035] The above-mentioned method for dismantling an emergency rescue device comprises the following specific steps: First, move the device to the designated demolition location and start the hydraulic cylinder 101, that is, transport hydraulic oil into the main push cavity 108 through the external pipe 103, thereby pushing the main push piston 104 to slide upward, and then the connecting block 202 moves forward to drive the expansion arm 201 to perform demolition and expansion work; since the two-way solenoid valve 111 is normally open, the secondary cavity 109 is not in a closed environment, and the secondary piston 106 can also move relatively, and then the sleeve 303 of the auxiliary support mechanism can adaptively deflect when the expansion arm 201 is working.

[0036] Next, when the designated expansion angle is reached, the passage of the three-way solenoid valve 112 is changed so that the hydraulic oil flows into the secondary cavity 109 to push the secondary piston 106 to slide upward and compress the space of the buffer cavity 114. At this time, the hydraulic oil also pushes the push rod 308 to drive the disc support tube 301 to move upward; Finally, when the disc-shaped support tube 301 moves upward, the movable sleeve rod 304 slides adaptively in the sleeve 303 and rotates as a whole until the movable sleeve rod 304 abuts against the edge side wall of the limiting groove 306a. At this time, the sleeves 303 and the movable sleeve rod 304 on both sides are horizontally aligned. At the same time, since the opening B302a is finally aligned with the opening A301a during the rotation process, the hydraulic oil enters the inside of the sleeve 303, thereby pushing the first push piston 304 to abut against the movable sleeve rod 304, and then the internal reinforcing struts 307 on both sides are connected into one, forming a good internal support, thereby increasing the stability of the device.

[0037] In summary, by connecting the inner reinforcing strut 307 between the arc-shaped portion 201a and the inner side of the supporting portion 201b, a good reinforcing support effect is formed, and when the hydraulic cylinder 101 is working, by pushing different pistons in stages, the expansion arm 201 can not only complete the expansion and demolition work, but also perform internal support according to actual conditions, thereby avoiding deformation of the end of the expansion part of the device due to excessive force, and having a good stabilizing effect, thereby improving the demolition efficiency of the rescue device, and also extending the service life of the equipment and reducing maintenance costs.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An emergency rescue and demolition device, characterized in that: include: A hydraulic unit (100) comprises: a hydraulic cylinder (101), an external through pipe (103) arranged outside the hydraulic cylinder (101), and an oil return pipe (110) at the tail of the hydraulic cylinder (101); An external expansion unit (200) comprises: a connection block (202), and expansion arms (201) symmetrically rotatably connected to both sides of the connection block (202), one end of the expansion arm (201) being rotatably connected to the head end of a hydraulic cylinder (101) via a connection rod (203), and the connection block (202) being driven by the hydraulic cylinder (101); The inner support unit (300) comprises: an inner reinforcing support rod (307) fixedly connected to the inner side of the expansion arm (201); an auxiliary support mechanism is arranged between the inner reinforcing support rods (307) on both sides, and the auxiliary support mechanism is also driven by a hydraulic cylinder (101).

2. The emergency rescue and demolition device according to claim 1, characterized in that: The inner side of the hydraulic cylinder (101) is slidably connected to a main push piston (104) and a secondary piston (106), and the inner side of the hydraulic cylinder (101) is also fixedly connected to a sealing partition (113). The main push piston (104), the sealing partition (113), and the secondary piston (106) separate the hydraulic cylinder (101) into a main push cavity (108), a buffer cavity (114), and a secondary cavity (109); The external communication tube (103) is used for communication between the main push cavity (108) and the secondary cavity (109); a vent hole is provided in the buffer cavity (114); a main push piston rod (105) is fixedly connected to the main push piston (104); the upper end of the main push piston rod (105) is fixedly connected to the connecting block (202); a secondary piston rod (107) is fixedly inserted into the secondary piston (106); the secondary piston rod (107) slides through the main push piston (104) and the main push piston rod (105), and a hollow hole is provided in the secondary piston rod (107).

3. The emergency rescue and demolition device according to claim 2, characterized in that: The auxiliary support mechanism comprises: a disc-shaped support tube (301), the two sides of the disc-shaped support tube (301) are rotatably connected with connecting elbow tubes (302), the connecting elbow tube (302) is fixedly connected with a sleeve (303), the sleeve (303) is slidably inserted with a movable sleeve rod (304), one end of the movable sleeve rod (304) is fixedly connected with a spherical support head (305), and a first push piston (303a) is arranged in the sleeve (303).

4. The emergency rescue and demolition device according to claim 3, characterized in that: The cross end of the inner reinforcing support rod (307) is fixedly connected to a C-shaped piece (306), a limiting groove (306a) is provided on the C-shaped piece (306), and the spherical support head (305) is located on the inner side of the C-shaped piece (306).

5. The emergency rescue and demolition device according to claim 4, characterized in that: A second push piston (309) is slidably connected inside the secondary piston rod (107), a push rod (308) is fixedly connected to the second push piston (309), the push rod (308) is fixedly connected to the disc-shaped support tube (301), and the inside of the push rod (308) is connected to the disc-shaped support tube (301) via a through hole.

6. The emergency rescue and demolition device according to claim 5, characterized in that: The butt ends of the disc-shaped support tube (301) and the connecting elbow tube (302) are respectively provided with an opening A (301a) and an opening B (302a). When the sleeve (303) is rotated to a horizontal alignment state, the opening A (301a) and the opening B (302a) are completely aligned.

7. The emergency rescue and demolition device according to claim 6, characterized in that: The expansion arm (201) comprises an arc-shaped portion (201a) and a support portion (201b), and the surface of the arc-shaped portion (201a) is provided with anti-slip teeth, and the two ends of the inner reinforcing support rod (307) are respectively fixedly connected to the inner sides of the arc-shaped portion (201a) and the support portion (201b).

8. The emergency rescue and demolition device according to claim 7, characterized in that: A two-way solenoid valve (111) and a three-way solenoid valve (112) are respectively provided on the oil return pipe (110) and the external pipe (103); an oil inlet port (103a) is provided on one side of the three-way solenoid valve (112); when the main pushing operation of the main pushing piston (104) is in progress, the two-way solenoid valve (111) is normally open, and the three-way solenoid valve (112) is connected to the main pushing cavity (108); when the secondary pushing operation of the secondary piston (106) is in progress, the two-way solenoid valve (111) is normally closed, and the three-way solenoid valve (112) is connected to the secondary cavity (109).

9. The emergency rescue and demolition device according to claim 8, characterized in that: The outer side of the hydraulic cylinder (101) is symmetrically fixedly connected with an auxiliary support frame, and a gripping frame (102) is fixedly connected between the auxiliary support frames on both sides, so as to facilitate the gripping operation of the staff.

10. A method for dismantling an emergency rescue dismantling device according to claim 9, characterized in that: The method comprises the following steps: Step 1: Move the device to the designated demolition location and start the hydraulic cylinder (101), that is, transport hydraulic oil into the main push cavity (108) through the external pipe (103), thereby pushing the main push piston (104) to slide upward, thereby causing the connecting block (202) to move forward and drive the expansion arm (201) to perform demolition and expansion work; Step 2: When the specified expansion angle is reached, the passage of the three-way solenoid valve (112) is changed so that the hydraulic oil flows into the secondary cavity (109) to push the secondary piston (106) to slide upward and compress the space of the buffer cavity (114). At this time, the hydraulic oil will also push the push rod (308) to drive the disc support tube (301) to move upward; Step 3: When the disc-shaped support tube (301) moves upward, the movable sleeve rod (304) slides adaptively in the sleeve (303) and rotates as a whole until the movable sleeve rod (304) abuts against the edge side wall of the limiting groove (306a). At this time, the sleeves (303) and the movable sleeve rod (304) on both sides are horizontally aligned. At the same time, since the opening B (302a) is finally aligned with the opening A (301a) during the rotation process, the hydraulic oil enters the inner side of the sleeve (303), thereby pushing the first push piston (304) against the movable sleeve rod (304), and then the inner reinforcing support rods (307) on both sides are connected together to form a good internal support, thereby increasing the stability of the device.

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