Hydraulic cylinder with buffer structure for emergency rescue machinery

Abstract

The application discloses a hydraulic oil cylinder with a buffer structure of an emergency rescue machine, and belongs to the field of hydraulic oil cylinders. The upper buffer structure and the lower buffer structure are respectively arranged at the two ends of the hydraulic cylinder body, so that the piston can be in contact with the upper buffer structure or the lower buffer structure for buffering when moving to the top or the bottom of the hydraulic cylinder body, the damping effect is achieved, the damage to the hydraulic cylinder push rod is reduced, the upper buffer structure and the lower buffer structure are both provided with double-layer buffer structures, and the corresponding spring strength adjusting structure is matched, so that the buffer effect is greatly improved, the adjustment is facilitated, and the use is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic cylinders, more particularly, to a hydraulic cylinder with a buffer structure for emergency rescue machinery. BACKGROUND

[0002] In the field of emergency rescue machinery, hydraulic cylinders are widely used in breaking, jacking, traction and other operation scenarios as core execution components.

[0003] In order to improve the buffering force when the piston moves to contact the two ends of the cylinder body, reduce the vibration of the hydraulic cylinder and reduce the damage to the hydraulic push rod, some existing hydraulic cylinders have a buffer spring structure installed at both ends of the cylinder body to buffer the piston. However, such a structure only has one layer of buffer spring, and the buffering and damping effect is poor. At the same time, the buffer spring is installed inside the cylinder body, and there is no corresponding adjusting structure to adjust the buffering force of the buffer spring, which is not convenient to use. Therefore, we propose a hydraulic cylinder with a buffer structure for emergency rescue machinery to solve the above problems. SUMMARY

[0004] 1. Technical problem to be solved

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a hydraulic cylinder with a buffer structure for emergency rescue machinery. By installing upper and lower buffer structures at both ends of the hydraulic cylinder body, the piston can be in contact with the upper or lower buffer structure when moving to the top or bottom of the hydraulic cylinder body, achieving the effect of reducing vibration and damage to the hydraulic cylinder push rod. At the same time, the upper and lower buffer structures are provided with inner and outer double-layer buffer structures, and are matched with corresponding spring force adjusting structures, greatly improving the buffering effect and facilitating adjustment, making the use more convenient.

[0006] 2. Technical solution

[0007] To solve the above problems, the present application adopts the following technical solution.

[0008] A hydraulic cylinder with a buffer structure for emergency rescue machinery, comprising an upper buffer structure and a lower buffer structure, the upper buffer structure and the lower buffer structure respectively comprising an upper end seat and a lower end seat, the upper end seat being provided with an inner buffer structure one and an outer buffer structure one, the inner buffer structure one being sleeved inside the outer buffer structure one, the lower end seat being provided with an inner buffer structure two and an outer buffer structure two, the inner buffer structure two being sleeved inside the outer buffer structure two.

[0009] The upper end seat is provided with a through rod hole at the center position of the inside, the inner buffer structure one comprises a support ring one sleeved outside the through rod hole, the bottom of the support ring one is fixedly welded with four top rods one, the upper end seat is provided with a through hole one corresponding to the positions of the four top rods one, the bottoms of the four top rods one are all penetrated to the bottom of the upper end seat through the corresponding through hole one, and the end portions between the bottoms of the four top rods one are fixedly installed through screws and contact rings one, the top of the support ring one is connected with a pressing ring one through a supporting spring one, the two sides of the pressing ring one are threadedly connected with threaded nails one, the upper end seat is provided with an internal thread hole one corresponding to the positions of the two threaded nails one, and the bottoms of the threaded nails one are threadedly connected with the internal thread hole one.

[0010] Further, the outer buffer structure one comprises a support ring two sleeved outside the support ring one, the bottom of the support ring two is fixedly welded with four top rods two, the upper end seat is provided with a through hole two corresponding to the positions of the four top rods two, the bottoms of the four top rods two are all penetrated to the bottom of the upper end seat through the corresponding through hole two, and the end portions between the bottoms of the four top rods two are fixedly installed through screws and contact rings two, the top of the support ring two is connected with a pressing ring two through a supporting spring two, the two sides of the pressing ring two are threadedly connected with threaded nails two, the upper end seat is provided with an internal thread hole two corresponding to the positions of the two threaded nails two, and the bottoms of the threaded nails two are threadedly connected with the internal thread hole two.

[0011] Further, the bottom of the lower end seat is fixedly welded with a lower ear seat, and the lower end seat and the lower ear seat are provided with a mounting cavity therebetween, and the inner buffer structure two and the outer buffer structure two are sleeved inside the mounting cavity.

[0012] Further, the inner buffer structure two comprises a support ring three arranged at the bottom of the lower end seat, the top of the support ring three is fixedly welded with four top rods three, the lower end seat is provided with a through hole three corresponding to the positions of the four top rods three, the tops of the four top rods three are all penetrated to the top of the lower end seat through the corresponding through hole three, and the end portions between the tops of the four top rods three are fixedly installed through screws and contact rings three, the bottom of the support ring three is connected with a pressing disc three through a supporting spring three, the center position of the pressing disc three is provided with a through hole one, the through hole one is sleeved with a mounting screw one, the end portion of the mounting screw one is fixedly welded at the center position of the bottom of the lower end seat, and a pressing nut one is threadedly connected on the mounting screw one at the bottom of the through hole one.

[0013] Further, the outer buffer structure two comprises a support ring four sleeved outside the support ring three, four top rods four are fixedly welded at the top of the support ring four, through holes four are formed at the lower end seat corresponding to the positions of the four top rods four, the four top rods four penetrate into the top of the lower end seat through the corresponding through holes four, and the top end portions of the four top rods four are fixedly installed through screws and contact rings four, a pressure plate four is connected to the bottom of the support ring four through a support spring four, a through hole two is formed at the central position of the pressure plate four, a mounting screw two is rotationally connected inside the through hole two, an adjusting nut is fixedly welded on the mounting screw two at the bottom of the through hole two, and a butt screw hole is formed in the bottom of the inner wall of the mounting cavity corresponding to the position of the mounting screw two.

[0014] Further, the lengths of the top rod one and the top rod three are equal, the lengths of the top rod two and the top rod four are equal, and the length of the top rod one is less than the length of the top rod two.

[0015] Further, the upper end seat and the lower end seat are fixedly installed through a hydraulic cylinder body, a piston is slidably connected inside the hydraulic cylinder body, a hydraulic cylinder push rod is fixedly installed at the top of the piston, and the hydraulic cylinder push rod extends to the top of the outer buffer structure one through the through rod hole.

[0016] Further, oil pipe joints are fixedly installed on one side of the outer walls of the upper end seat and the lower end seat, oil passage channels are formed in the upper end seat or the lower end seat corresponding to the positions of the oil pipe joints, and the other end portions of the oil passage channels are in communication with the inside of the hydraulic cylinder body.

[0017] 3. Beneficial effects

[0018] Compared with the prior art, the application has the following advantages:

[0019] (1) In the scheme, the upper buffer structure and the lower buffer structure are respectively installed at the two ends of the hydraulic cylinder body, so that the piston can be in contact with the upper buffer structure or the lower buffer structure for buffering when moving to the top or the bottom inside the hydraulic cylinder body, thereby achieving the effects of shock absorption and reducing damage to the hydraulic cylinder push rod.

[0020] The upper buffer structure is provided with the inner buffer structure one and the outer buffer structure one, so that when the piston moves to the top, the piston first contacts the contact ring two of the outer buffer structure one for buffering, and then simultaneously contacts the contact ring one of the inner buffer structure one for buffering, so that the two-stage buffering and damping effect is achieved when the piston moves to the top.

[0021] (2) The inner buffer structure one and the outer buffer structure one of the upper buffer structure are respectively provided with two threaded nails one and threaded nails two, which can be used to adjust the distance between the pressure ring one and the pressure ring two and the upper end seat, so as to change the supporting force of the supporting spring one and the supporting spring two, so that the buffering force can be adjusted.

[0022] Meanwhile, the inner buffer structure two and the outer buffer structure two of the lower buffer structure are respectively provided with a compression nut one and an adjusting nut, which can be used to adjust the distance between the pressure disc three and the pressure disc four and the lower end seat, so as to change the supporting force of the supporting spring three and the supporting spring four, so that the buffering force can be adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 1 It is a schematic diagram of the middle part area;

[0025] Figure 3 It is a schematic diagram of the overall structure of the present application;

[0026] Figure 4 It is a schematic diagram of the upper buffer structure of the present application;

[0027] Figure 5 It is a schematic diagram of the upper buffer structure of the present application;

[0028] Figure 6 It is a schematic diagram of the middle part area of the present application; Figure 5 Figure 1

[0029] Figure 7 It is a schematic diagram of the middle part area of the present application; Figure 5 Figure 2

[0030] Figure 8 It is a schematic diagram of the lower buffer structure of the present application;

[0031] ​​​​Figure 9 The lower buffer structure of the present application is shown in the figure;

[0032] Figure 10 The upper buffer structure of the present application is shown in the figure; Figure 9 The middle partial area structure of the present application is shown in the figure Figure 1 ;

[0033] Figure 11 The middle partial area structure of the present application is shown in the figure Figure 9 ; Figure 2

[0034] Figure 12 The middle partial area structure of the present application is shown in the figure Figure 9 . Figure 3

[0035] Explanation of the figure:

[0036] 1, upper buffer structure; 101, upper end seat; 102, through rod hole; 103, through hole one; 104, internal thread hole one; 105, through hole two; 106, internal thread hole two;

[0037] 2, inner buffer structure one; 3, support ring one; 4, top rod one; 5, contact ring one; 6, support spring one; 7, compression ring one; 8, threaded pin one;

[0038] 9, outer buffer structure one; 10, support ring two; 11, top rod two; 12, contact ring two; 13, support spring two; 14, compression ring two; 15, threaded pin two;

[0039] 16, lower buffer structure; 1601, lower end seat; 1602, through hole three; 1603, through hole four; 1604, butt joint threaded hole; 1605, lower lug seat;

[0040] 17, inner buffer structure two; 18, support ring three; 19, top rod three; 20, contact ring three; 21, support spring three; 22, compression disc three; 2201, through hole one; 23, mounting screw one; 24, compression nut one;

[0041] 25, outer buffer structure two; 26, support ring four; 27, top rod four; 28, contact ring four; 29, support spring four; 30, compression disc four; 3001, through hole two; 31, mounting screw two; 3101, adjusting nut;

[0042] 32, hydraulic cylinder body; 33, piston; 34, hydraulic cylinder push rod; 35, oil pipe joint. DETAILED DESCRIPTION

[0043] ​​The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the specification of the present application; obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the protection scope of the present application.

[0044] Embodiment 1

[0045] Please refer to Figures 1-7 The hydraulic cylinder with a buffer structure of an emergency rescue machine comprises an upper buffer structure 1 and a lower buffer structure 16, the upper buffer structure 1 and the lower buffer structure 16 comprise an upper end seat 101 and a lower end seat 1601 respectively, the upper end seat 101 is provided with an inner buffer structure one 2 and an outer buffer structure one 9, the inner buffer structure one 2 is sleeved in the outer buffer structure one 9, the lower end seat 1601 is provided with an inner buffer structure two 17 and an outer buffer structure two 25, the inner buffer structure two 17 is sleeved in the outer buffer structure two 25;

[0046] A through rod hole 102 is formed at a central position in the inner part of the upper end seat 101, the inner buffer structure one 2 comprises a support ring one 3 sleeved outside the through rod hole 102, four top rods one 4 are fixedly welded to the bottom of the support ring one 3, through holes one 103 are formed in the upper end seat 101 at positions corresponding to the four top rods one 4, the bottoms of the four top rods one 4 are all penetrated to the bottom of the upper end seat 101 through the corresponding through holes one 103, and the end portions of the bottoms of the four top rods one 4 are fixedly installed through screws and a contact ring one 5, a pressing ring one 7 is connected to the top of the support ring one 3 through a supporting spring one 6, and threaded penetrating nails one 8 are threadedly connected to the two sides of the pressing ring one 7, internal thread holes one 104 are formed in the upper end seat 101 at positions corresponding to the two threaded penetrating nails one 8, and the bottoms of the threaded penetrating nails one 8 are threadedly connected to the inner parts of the corresponding internal thread holes one 104;

[0047] The outer buffer structure one 9 comprises a support ring two 10 sleeved outside the support ring one 3, four top rods two 11 are fixedly welded to the bottom of the support ring two 10, through holes two 105 are formed in the upper end seat 101 at positions corresponding to the four top rods two 11, the bottoms of the four top rods two 11 are all penetrated to the bottom of the upper end seat 101 through the corresponding through holes two 105, and the end portions of the bottoms of the four top rods two 11 are fixedly installed through screws and a contact ring two 12, a pressing ring two 14 is connected to the top of the support ring two 10 through a supporting spring two 13, threaded penetrating nails two 15 are threadedly connected to the two sides of the pressing ring two 14, internal thread holes two 106 are formed in the upper end seat 101 at positions corresponding to the two threaded penetrating nails two 15, and the bottoms of the threaded penetrating nails two 15 are threadedly connected to the inner parts of the corresponding internal thread holes two 106;

[0048] The bottom of the lower end seat 1601 is fixedly welded with a lower lug seat 1605, and a mounting cavity is arranged between the lower end seat 1601 and the lower lug seat 1605, and the inner buffer structure two 17 and the outer buffer structure two 25 are sleeved in the mounting cavity;

[0049] The inner buffer structure two 17 comprises a support ring three 18 arranged at the bottom of the lower end seat 1601, the top of the support ring three 18 is fixedly welded with four top rods three 19, through holes three 1602 are arranged at positions corresponding to the four top rods three 19 on the lower end seat 1601, the top of the four top rods three 19 penetrates through the corresponding through holes three 1602 to the top of the lower end seat 1601, and the top ends of the four top rods three 19 are fixedly installed through screws and contact rings three 20 between the top ends, the bottom of the support ring three 18 is connected with a pressure disc three 22 through a support spring three 21, a through hole one 2201 is arranged at the center position of the pressure disc three 22, a mounting screw one 23 is sleeved in the through hole one 2201, the end of the mounting screw one 23 is fixedly welded at the center position of the bottom of the lower end seat 1601, and a compression nut one 24 is threadedly connected on the mounting screw one 23 at the bottom of the through hole one 2201;

[0050] The outer buffer structure two 25 comprises a support ring four 26 sleeved outside the support ring three 18, the top of the support ring four 26 is fixedly welded with four top rods four 27, through holes four 1603 are arranged at positions corresponding to the four top rods four 27 on the lower end seat 1601, the top of the four top rods four 27 penetrates through the corresponding through holes four 1603 to the top of the lower end seat 1601, and the top ends of the four top rods four 27 are fixedly installed through screws and contact rings four 28 between the top ends, the bottom of the support ring four 26 is connected with a pressure disc four 30 through a support spring four 29, a through hole two 3001 is arranged at the center position of the pressure disc four 30, a mounting screw two 31 is rotationally connected in the through hole two 3001, an adjusting nut 3101 is fixedly welded on the mounting screw two 31 at the bottom of the through hole two 3001, a butt thread hole 1604 is arranged at the bottom of the inner wall of the mounting cavity corresponding to the position of the mounting screw two 31, and the bottom end of the mounting screw two 31 is threadedly connected in the butt thread hole 1604;

[0051] The length of the top rod one 4 is equal to that of the top rod three 19, the length of the top rod two 11 is equal to that of the top rod four 27, and the length of the top rod one 4 is less than that of the top rod two 11;

[0052] The upper end seat 101 and the lower end seat 1601 are fixedly installed through the hydraulic cylinder body 32, the piston 33 is slidably connected in the hydraulic cylinder body 32, the hydraulic cylinder push rod 34 is fixedly installed at the top of the piston 33, and the top of the hydraulic cylinder push rod 34 extends to the top of the outer buffer structure one 9 through the penetrating rod hole 102;

[0053] The outer wall of the upper end seat 101 and the lower end seat 1601 is fixedly installed with an oil pipe joint 35. An oil passage is formed in the upper end seat 101 or the lower end seat 1601 corresponding to the position of the oil pipe joint 35, and the other end of the oil passage is connected with the inside of the hydraulic cylinder body 32.

[0054] The upper buffer structure of the hydraulic cylinder has the following buffer and damping principle:

[0055] When the hydraulic cylinder pushes the rod 34 outward, and the piston 33 continuously approaches the upper buffer structure 1 in the hydraulic cylinder body 32, the piston 33 first contacts the outer buffer structure one 9 of the upper buffer structure 1 when it moves to the top end, that is, the piston 33 first contacts the contact ring two 12 of the outer buffer structure one 9 when it moves to the top end. During the continuous upward movement of the piston 33, the contact ring two 12, the four top rods two 11, and the support ring two 10 are lifted upward, and then the support spring two 13 is compressed, achieving the primary buffer and damping effect when the piston 33 moves upward. If you want to increase the buffer intensity, you only need to twist the two threaded nails two 15 to move the compression ring two 14 downward. At this time, the compression ring two 14 can increase the extrusion intensity of the support ring two 10 through the support spring two 13, thereby achieving the effect of increasing the buffer force. Conversely, if you want to reduce the buffer intensity, you only need to twist the two threaded nails two 15 in the opposite direction.

[0056] When the piston 33 continuously moves upward and compresses the contact ring two 12 to be flush with the contact ring one 5, the piston 33 contacts the contact ring two 12 and the contact ring one 5 at the same time. Based on the above, the contact ring one 5 is also extruded upward while the contact ring two 12 is continuously extruded upward. At this time, the movement of the contact ring one 5 is buffered by the connection of the four top rods one 4, the support ring one 3, and the support spring one 6, thereby achieving the secondary buffer and damping effect of the continuously upward movement of the piston 33. If you want to increase the buffer intensity of the contact ring one 5, you only need to twist the two threaded nails one 8 to move the compression ring one 7 downward, thereby increasing the extrusion force of the support spring one 6 and the support ring one 3. Conversely, if you want to reduce the buffer intensity of the contact ring one 5, you only need to twist the two threaded nails one 8 in the opposite direction.

[0057] Example 2:

[0058] In view of the above example 1, further description is made, referring to Figures 8-12 The lower buffer structure of the hydraulic cylinder has the following buffer and damping principle:

[0059] When the hydraulic cylinder push rod 34 performs the inward contraction action, and the piston 33 is continuously buffered to the lower buffer structure 16 inside the hydraulic cylinder body 32, at this time, because the length of the top rod one 4 and the length of the top rod three 19 are equal, the length of the top rod two 11 and the length of the top rod four 27 are equal, and the length of the top rod one 4 is less than the length of the top rod two 11, so when the piston 33 moves to the bottom, it first contacts the outer buffer structure two 25 of the lower buffer structure 16, that is, the piston 33 first contacts the contact ring four 28 when it moves to the bottom, and the contact ring four 28 is pushed down when the piston 33 continuously moves down, at this time, through the connection of the four top rod four 27, the support ring four 26 and the support spring four 29, the downward movement of the contact ring four 28 and the piston 33 can be buffered and damped, if you want to increase the intensity of the contact ring four 28 and the piston 33 downward buffer, you only need to twist the adjusting nut 3101, promote the upward movement of the pressure plate four 30, at this time, the distance between the pressure plate four 30 and the lower end seat 1601 is reduced, so as to further compress the support spring four 29, and achieve the effect of increasing the intensity of the contact ring four 28 and the piston 33 downward buffer, on the contrary, if you want to reduce the intensity of the contact ring four 28 and the piston 33 downward buffer, you only need to twist the adjusting nut 3101 in the opposite direction.

[0060] Based on the above, when the piston 33 continuously moves down and compresses the contact ring four 28 and the contact ring three 20 to be flush, at this time, the piston 33 simultaneously extrudes the contact ring four 28 and the contact ring three 20, and the piston 33 continues to extrude the contact ring three 20 while the contact ring four 28 is buffered and damped, at this time, through the connection of the four top rod three 19, the support ring three 18 and the support spring three 21, the contact ring three 20 can be buffered, so as to realize the buffering and damping of the downward movement of the piston 33, if you want to increase the buffering intensity of the contact ring three 20, you only need to twist the compression nut one 24 to reduce the distance between the pressure plate three 22 and the lower end seat 1601, on the contrary, if you want to reduce the buffering intensity of the contact ring three 20, you only need to twist the compression nut one 24 in the opposite direction.

[0061] The above is only the preferred specific embodiment of the present application; however, the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the improvement concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A hydraulic cylinder with a buffer structure for emergency rescue machinery, comprising an upper buffer structure (1) and a lower buffer structure (16), characterized in that: The upper buffer structure (1) and the lower buffer structure (16) comprise an upper end seat (101) and a lower end seat (1601) respectively, the upper end seat (101) is provided with an inner buffer structure one (2) and an outer buffer structure one (9), the inner buffer structure one (2) is sleeved in the outer buffer structure one (9), the lower end seat (1601) is provided with an inner buffer structure two (17) and an outer buffer structure two (25), the inner buffer structure two (17) is sleeved in the outer buffer structure two (25); The upper end seat (101) is provided with a through rod hole (102) at the central position inside, the inner buffer structure one (2) comprises a support ring one (3) sleeved outside the through rod hole (102), the support ring one (3) is fixedly welded with four top rods one (4) at the bottom, the upper end seat (101) is provided with a through hole one (103) corresponding to the position of the four top rods one (4), the four top rods one (4) are all penetrated to the bottom of the upper end seat (101) through the through hole one (103), and the bottom ends of the four top rods one (4) are fixedly installed through the screw and the contact ring one (5), the support ring one (3) is connected with the pressing ring one (7) through the supporting spring one (6) at the top, the pressing ring one (7) is threadedly connected with the threaded penetrating nail one (8) on both sides, the upper end seat (101) is provided with an internal thread hole one (104) corresponding to the position of the two threaded penetrating nails one (8), and the threaded penetrating nail one (8) is threadedly connected with the internal thread hole one (104) inside. The outer buffer structure one (9) comprises a support ring two (10) sleeved outside the support ring one (3), the support ring two (10) is fixedly welded with four top rods two (11) at the bottom, the upper end seat (101) is provided with a through hole two (105) corresponding to the position of the four top rods two (11), the four top rods two (11) are all penetrated to the bottom of the upper end seat (101) through the through hole two (105), and the bottom ends of the four top rods two (11) are fixedly installed through the screw and the contact ring two (12), the support ring two (10) is connected with the pressing ring two (14) through the supporting spring two (13) at the top, the pressing ring two (14) is threadedly connected with the threaded penetrating nail two (15) on both sides, the upper end seat (101) is provided with an internal thread hole two (106) corresponding to the position of the two threaded penetrating nails two (15), and the threaded penetrating nail two (15) is threadedly connected with the internal thread hole two (106) inside. The length of the top rod one (4) is less than the length of the top rod two (11).

2. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 1, characterized in that: The lower end seat (1601) is fixedly welded with a lower ear seat (1605) at the bottom, and an installation cavity is formed between the lower end seat (1601) and the lower ear seat (1605), the inner buffer structure two (17) and the outer buffer structure two (25) are sleeved inside the installation cavity.

3. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 2, characterized in that: The inner buffer structure two (17) includes a support ring three (18) arranged at the bottom of the lower end seat (1601), the top of the support ring three (18) is fixedly welded with four top rods three (19), through holes three (1602) are formed in the lower end seat (1601) at positions corresponding to the four top rods three (19), the four top rods three (19) penetrate the through holes three (1602) and extend to the top of the lower end seat (1601), and the top ends of the four top rods three (19) are fixedly connected by screws and contact rings three (20), the bottom of the support ring three (18) is connected with a pressure disc three (22) through a support spring three (21), a through hole one (2201) is formed in the center of the pressure disc three (22), a mounting screw one (23) is sleeved in the through hole one (2201), the mounting screw one (23) is fixedly welded at the bottom center of the lower end seat (1601), and a compression nut one (24) is threadedly connected to the mounting screw one (23) at the bottom of the through hole one (2201).

4. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 3, characterized in that: The outer buffer structure two (25) includes a support ring four (26) sleeved outside the support ring three (18), the top of the support ring four (26) is fixedly welded with four top rods four (27), through holes four (1603) are formed in the lower end seat (1601) at positions corresponding to the four top rods four (27), the four top rods four (27) penetrate the through holes four (1603) and extend to the top of the lower end seat (1601), and the top ends of the four top rods four (27) are fixedly connected by screws and contact rings four (28), the bottom of the support ring four (26) is connected with a pressure disc four (30) through a support spring four (29), a through hole two (3001) is formed in the center of the pressure disc four (30), a mounting screw two (31) is rotatably connected in the through hole two (3001), an adjusting nut (3101) is fixedly welded on the mounting screw two (31) at the bottom of the through hole two (3001), butt screw holes (1604) are formed in the bottom of the inner wall of the mounting cavity at positions corresponding to the mounting screw two (31), and the bottom end of the mounting screw two (31) is screw-connected in the butt screw holes (1604).

5. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 4, characterized in that: The top rod one (4) and the top rod three (19) have equal lengths, and the top rod two (11) and the top rod four (27) have equal lengths.

6. The hydraulic cylinder with a buffer structure for an emergency rescue machine according to claim 1, characterized in that: The upper end seat (101) and the lower end seat (1601) are fixedly connected by a hydraulic cylinder body (32), a piston (33) is slidably connected in the hydraulic cylinder body (32), a hydraulic cylinder push rod (34) is fixedly connected to the top of the piston (33), and the hydraulic cylinder push rod (34) extends to the top of the outer buffer structure one (9) through the penetrating rod hole (102).

7. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 6, characterized in that: The upper end seat (101) and the lower end seat (1601) are fixedly installed with oil pipe joints (35) on one side of the outer wall, and oil passage channels are formed in the upper end seat (101) and the lower end seat (1601) corresponding to the positions of the oil pipe joints (35), and the other end of the oil passage channels is connected with the inside of the hydraulic cylinder body (32).

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