Hydraulic oil cylinder with buffer structure for emergency rescue machinery

Abstract

The invention discloses a hydraulic oil cylinder with buffer structures for emergency rescue machinery, which belongs to the field of hydraulic oil cylinders and is characterized in that an upper buffer structure and a lower buffer structure are respectively mounted at two ends of a cylinder body of the hydraulic cylinder, so that when a piston moves to the topmost part or the bottommost part in the cylinder body of the hydraulic cylinder, the upper buffer structure and the lower buffer structure are separated from each other; the buffering structure can be in contact with the upper buffering structure or the lower buffering structure for buffering, the effects of damping and reducing damage to a hydraulic cylinder push rod are achieved, meanwhile, the upper buffering structure and the lower buffering structure are each provided with an inner-outer double-layer buffering structure, a corresponding spring force adjustable structure is matched, the buffering effect is greatly improved, adjustment is convenient, and the buffering effect is good. The use is more convenient.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic cylinders, and more specifically, to a hydraulic cylinder with a buffer structure for emergency rescue machinery. Background Art

[0002] In the field of emergency rescue machinery, hydraulic cylinders, as core actuating elements, are widely used in operation scenarios such as demolition, jacking, and traction.

[0003] In order to increase the buffer force when the piston inside the hydraulic cylinder moves to contact the two end parts inside the cylinder body, reduce the vibration of the hydraulic cylinder, and mitigate the damage to the hydraulic push rod, existing hydraulic cylinders are equipped with a structure in which buffer springs are installed at both ends inside the cylinder body to buffer and shock-absorb the piston. However, in such a structure, only one layer of buffer spring is provided, and the buffer and shock-absorbing effect is poor. At the same time, the buffer springs are mostly installed inside the cylinder body, lacking a corresponding adjustment structure to adjust the buffer force generated by the buffer springs, making it inconvenient to use. Therefore, we propose a hydraulic cylinder with a buffer structure for emergency rescue machinery to solve the above existing problems. Summary of the Invention

[0004] 1. Technical Problems to be Solved Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a hydraulic cylinder with a buffer structure for emergency rescue machinery. By respectively installing an upper buffer structure and a lower buffer structure at both ends of the hydraulic cylinder body, when the piston moves to the top or bottom inside the hydraulic cylinder body, it can contact and buffer with the upper buffer structure or the lower buffer structure respectively, achieving the effects of shock absorption and reducing the damage to the hydraulic cylinder push rod. At the same time, both the upper buffer structure and the lower buffer structure are provided with inner and outer double-layer buffer structures, and are equipped with corresponding spring force adjustable structures, greatly improving the buffer effect and being convenient to adjust, and more convenient to use.

[0005] 2. Technical Solutions To solve the above problems, the present invention adopts the following technical solutions.

[0006] A hydraulic cylinder with a buffer structure for emergency rescue machinery includes an upper buffer structure and a lower buffer structure. The upper buffer structure and the lower buffer structure respectively include an upper end seat and a lower end seat. An inner buffer structure one and an outer buffer structure one are provided on the upper end seat. The inner buffer structure one is sleeved inside the outer buffer structure one. An inner buffer structure two and an outer buffer structure two are provided on the lower end seat. The inner buffer structure two is sleeved inside the outer buffer structure two; A through rod hole is provided at the central position inside the upper seat. The first inner buffer structure includes a first support ring sleeved outside the through rod hole. Four first ejector rods are fixedly welded to the bottom of the first support ring. Through holes one are provided on the upper seat corresponding to the positions of the four first ejector rods. The bottoms of the four first ejector rods all penetrate through the through holes one to the bottom of the upper seat, and the ends of the bottoms of the four first ejector rods are fixedly installed through screws and a first contact ring. The top of the first support ring is connected to a first pressing ring through a first support spring. Threaded pins one are threadedly connected to both sides of the first pressing ring. Inner threaded holes one are provided on the upper seat corresponding to the positions of the two threaded pins one. The bottoms of the threaded pins one are threadedly connected to the interiors of the corresponding inner threaded holes one.

[0007] Further, the first outer buffer structure includes a second support ring sleeved outside the first support ring. Four second ejector rods are fixedly welded to the bottom of the second support ring. Through holes two are provided on the upper seat corresponding to the positions of the four second ejector rods. The bottoms of the four second ejector rods all penetrate through the through holes two to the bottom of the upper seat, and the ends of the bottoms of the four second ejector rods are fixedly installed through screws and a second contact ring. The top of the second support ring is connected to a second pressing ring through a second support spring. Threaded pins two are threadedly connected to both sides of the second pressing ring. Inner threaded holes two are provided on the upper seat corresponding to the positions of the two threaded pins two. The bottoms of the threaded pins two are threadedly connected to the interiors of the corresponding inner threaded holes two.

[0008] Further, a lower ear seat is fixedly welded to the bottom of the lower seat, and an installation cavity is provided between the lower seat and the lower ear seat. The second inner buffer structure and the second outer buffer structure are sleeved inside the installation cavity.

[0009] Further, the second inner buffer structure includes a third support ring provided at the bottom of the lower seat. Four third ejector rods are fixedly welded to the top of the third support ring. Through holes three are provided on the lower seat corresponding to the positions of the four third ejector rods. The tops of the four third ejector rods all penetrate through the through holes three to the top of the lower seat, and the ends of the tops of the four third ejector rods are fixedly installed through screws and a third contact ring. The bottom of the third support ring is connected to a third pressing disc through a third support spring. A through hole one is provided at the central position of the third pressing disc. An installation screw one is sleeved inside the through hole one. The end of the installation screw one is fixedly welded to the central position of the bottom of the lower seat. A pressing nut one is threadedly connected to the installation screw one located at the bottom of the through hole one.

[0010] Further, the second outer buffer structure includes a fourth support ring sleeved outside the third support ring. Four ejector rods four are fixedly welded to the top of the fourth support ring. Through holes four are formed in the lower end seat at positions corresponding to the four ejector rods four. The tops of the four ejector rods four all penetrate through the through holes four to the top of the lower end seat, and the tops of the four ejector rods four are fixedly installed through screws and a fourth contact ring. The bottom of the fourth support ring is connected to a fourth pressure plate through a fourth support spring. A second through hole is formed at the central position of the fourth pressure plate. A mounting screw two is rotatably connected inside the second through hole. An adjusting nut is fixedly welded to the mounting screw two at the bottom of the second through hole. A docking threaded hole is formed at the bottom of the inner wall of the mounting cavity corresponding to the mounting screw two. The bottom end of the mounting screw two is threadedly connected inside the docking threaded hole.

[0011] Further, the first ejector rod and the third ejector rod are equal in length, the second ejector rod and the fourth ejector rod are equal in length, and the length of the first ejector rod is less than the length of the second ejector rod.

[0012] Further, the upper end seat and the lower end seat are fixedly installed through a hydraulic cylinder block. A piston is slidably connected inside the hydraulic cylinder block. A hydraulic cylinder push rod is fixedly installed at the top of the piston, and the top of the hydraulic cylinder push rod extends to the top of the first outer buffer structure through the through rod hole.

[0013] 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 inside the upper end seat or the lower end seat at positions corresponding to the oil pipe joints. The other end of the oil passage channel is communicated with the inside of the hydraulic cylinder block.

[0014] 3. Beneficial Effects Compared with the prior art, the advantages of the present invention are as follows: (1) In this solution, by installing an upper buffer structure and a lower buffer structure at both ends of the hydraulic cylinder block respectively, when the piston moves to the top or bottom inside the hydraulic cylinder block, it can contact and buffer with the upper buffer structure or the lower buffer structure respectively, achieving the effects of shock absorption and reducing damage to the hydraulic cylinder push rod; At the same time, the upper buffer structure is provided with an inner buffer structure one and an outer buffer structure one. When the piston moves to the top, it first contacts and buffers with the contact ring two of the outer buffer structure one, and then simultaneously contacts and buffers with the contact ring one of the inner buffer structure one, achieving a secondary buffer and shock absorption effect when the piston moves up to the top. The lower buffer structure is provided with an inner buffer structure two and an outer buffer structure two. When the piston moves to the bottom, it first contacts and buffers with the contact ring four of the outer buffer structure two, and then simultaneously contacts and buffers with the contact ring three of the inner buffer structure two, achieving a secondary buffer and shock absorption effect when the piston moves down to the bottom; (2) In this solution, the inner buffer structure 1 and the outer buffer structure 1 of the upper buffer structure are respectively provided with two threaded studs 1 and threaded studs 2, which can be used to adjust the distances between the pressure rings 1 and 2 and the upper end seat respectively, and then change the supporting forces of the supporting springs 1 and 2, so as to achieve the effect of adjustable buffering force. At the same time, the inner buffer structure 2 and the outer buffer structure 2 of the lower buffer structure are respectively provided with a compression nut 1 and an adjusting nut, which can be used to adjust the distances between the pressure plates 3 and 4 and the lower end seat respectively, and then change the supporting forces of the supporting springs 3 and 4, so as to achieve the effect of adjustable buffering force. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 of the present invention Figure 1 is a schematic diagram of the enlarged structure of a partial area; Figure 3 is a schematic diagram of the split structure of the present invention; Figure 4 is a schematic diagram of the upper buffer structure of the present invention; Figure 5 is a schematic diagram of the split of the upper buffer structure of the present invention; Figure 6 of the present invention Figure 5 is a schematic diagram of a partial area structure Figure 1 ; Figure 7 of the present invention Figure 5 is a schematic diagram of a partial area structure Figure 2 ; Figure 8 is a schematic diagram of the lower buffer structure of the present invention; Figure 9 is a schematic diagram of the split of the lower buffer structure of the present invention; Figure 10 of the present invention Figure 9 is a schematic diagram of a partial area structure Figure 1 ; Figure 11 of the present invention Figure 9 is a schematic diagram of a partial area structure Figure 2 ; Figure 12 of the present invention Figure 9 is a schematic diagram of a partial area structure Figure 3 .

[0016] Explanation of the reference numerals in the drawings: 1. Upper buffer structure; 101. Upper end seat; 102. Through rod hole; 103. Through hole 1; 104. Internal thread hole 1; 105. Through hole 2; 106. Internal thread hole 2; 2. Inner buffer structure 1; 3. Support ring 1; 4. Push rod 1; 5. Contact ring 1; 6. Support spring 1; 7. Pressure ring 1; 8. Threaded stud 1; 9. Outer buffer structure 1; 10. Support ring 2; 11. Push rod 2; 12. Contact ring 2; 13. Support spring 2; 14. Pressure ring 2; 15. Threaded stud 2; 16. Lower buffer structure; 1601. Lower end seat; 1602. Through hole 3; 1603. Through hole 4; 1604. Docking threaded hole; 1605. Lower ear seat; 17. Inner buffer structure 2; 18. Support ring 3; 19. Push rod 3; 20. Contact ring 3; 21. Support spring 3; 22. Pressure plate 3; 2201. Through hole 1; 23. Mounting screw 1; 24. Compression nut 1; 25. Outer buffer structure 2; 26. Support ring 4; 27. Push rod 4; 28. Contact ring 4; 29. Support spring 4; 30. Pressure plate 4; 3001. Through hole 2; 31. Mounting screw 2; 3101. Adjusting nut; 32. Hydraulic cylinder block; 33. Piston; 34. Hydraulic cylinder push rod; 35. Oil pipe joint. Specific embodiments

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1:

[0019] Please refer to Figures 1-7 , a hydraulic cylinder with a buffer structure for an emergency rescue machine, including an upper buffer structure 1 and a lower buffer structure 16. The upper buffer structure 1 and the lower buffer structure 16 respectively include an upper end seat 101 and a lower end seat 1601. An inner buffer structure 1 and an outer buffer structure 1 are provided on the upper end seat 101. The inner buffer structure 1 is sleeved inside the outer buffer structure 1. An inner buffer structure 2 and an outer buffer structure 2 are provided on the lower end seat 1601. The inner buffer structure 2 is sleeved inside the outer buffer structure 2; A through rod hole 102 is provided at the central position inside the upper end seat 101. The inner buffer structure one 2 includes a first support ring 3 sleeved outside the through rod hole 102. Four first ejector rods 4 are fixedly welded to the bottom of the first support ring 3. Through holes one 103 are provided on the upper end seat 101 corresponding to the positions of the four first ejector rods 4. The bottoms of the four first ejector rods 4 all pass through the through holes one 103 to the bottom of the upper end seat 101, and the bottom ends of the four first ejector rods 4 are fixedly installed through screws and a first contact ring 5. The top of the first support ring 3 is connected to a first pressure ring 7 through a first support spring 6. Threaded through bolts one 8 are threadedly connected to both sides of the first pressure ring 7. Inner threaded holes one 104 are provided on the upper end seat 101 corresponding to the positions of the two threaded through bolts one 8. The bottoms of the threaded through bolts one 8 are threadedly connected to the interiors of the corresponding inner threaded holes one 104; The outer buffer structure one 9 includes a second support ring 10 sleeved outside the first support ring 3. Four second ejector rods 11 are fixedly welded to the bottom of the second support ring 10. Through holes two 105 are provided on the upper end seat 101 corresponding to the positions of the four second ejector rods 11. The bottoms of the four second ejector rods 11 all pass through the through holes two 105 to the bottom of the upper end seat 101, and the bottom ends of the four second ejector rods 11 are fixedly installed through screws and a second contact ring 12. The top of the second support ring 10 is connected to a second pressure ring 14 through a second support spring 13. Threaded through bolts two 15 are threadedly connected to both sides of the second pressure ring 14. Inner threaded holes two 106 are provided on the upper end seat 101 corresponding to the positions of the two threaded through bolts two 15. The bottoms of the threaded through bolts two 15 are threadedly connected to the interiors of the corresponding inner threaded holes two 106; The bottom of the lower end seat 1601 is fixedly welded with a lower ear seat 1605, and an installation cavity is provided 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; The inner buffer structure two 17 includes a third support ring 18 provided at the bottom of the lower end seat 1601. Four third ejector rods 19 are fixedly welded to the top of the third support ring 18. Through holes three 1602 are provided on the lower end seat 1601 corresponding to the positions of the four third ejector rods 19. The tops of the four third ejector rods 19 all pass through the through holes three 1602 to the top of the lower end seat 1601, and the top ends of the four third ejector rods 19 are fixedly installed through screws and a third contact ring 20. The bottom of the third support ring 18 is connected to a third pressure plate 22 through a third support spring 21. A through hole one 2201 is provided at the central position of the third pressure plate 22. An installation screw one 23 is sleeved inside the through hole one 2201. The end of the installation screw one 23 is fixedly welded to the central position at the bottom of the lower end seat 1601. A compression nut one 24 is threadedly connected to the installation screw one 23 located at the bottom of the through hole one 2201; The outer buffer structure II 25 includes a support ring IV 26 sleeved outside the support ring III 18. Four ejector rods IV 27 are fixedly welded to the top of the support ring IV 26. Through holes IV 1603 are formed in the lower end seat 1601 at positions corresponding to the four ejector rods IV 27. The tops of the four ejector rods IV 27 all penetrate through the through holes IV 1603 to the top of the lower end seat 1601, and the ends of the tops of the four ejector rods IV 27 are fixedly installed through screws and a contact ring IV 28. The bottom of the support ring IV 26 is connected to a pressure plate IV 30 through a support spring IV 29. A through hole II 3001 is formed at the central position of the pressure plate IV 30. An installation screw II 31 is rotatably connected inside the through hole II 3001. An adjusting nut 3101 is fixedly welded to the installation screw II 31 at the bottom of the through hole II 3001. A butt joint threaded hole 1604 is formed at the bottom of the inner wall of the installation cavity corresponding to the installation screw II 31. The bottom end of the installation screw II 31 is threadedly connected inside the butt joint threaded hole 1604; The ejector rod I 4 and the ejector rod III 19 are of equal length. The ejector rod II 11 and the ejector rod IV 27 are of equal length. The length of the ejector rod I 4 is less than the length of the ejector rod II 11; The upper end seat 101 and the lower end seat 1601 are fixedly installed through a hydraulic cylinder body 32. A piston 33 is slidably connected inside the hydraulic cylinder body 32. A 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 I 9 through a through rod hole 102; Oil pipe connectors 35 are fixedly installed on one side of the outer walls of the upper end seat 101 and the lower end seat 1601. Oil circuit channels are formed inside the upper end seat 101 or the lower end seat 1601 at positions corresponding to the oil pipe connectors 35. The other end of the oil circuit channel is communicated with the inside of the hydraulic cylinder body 32.

[0020] The buffering and shock absorption principle of the upper buffer structure of the hydraulic cylinder with a buffer structure of this emergency rescue machine is as follows: When the hydraulic cylinder push rod 34 of this type of hydraulic cylinder performs an outward pushing action and makes the piston 33 continuously approach the upper buffer structure 1 inside the hydraulic cylinder block 32, at this time, since the length of the first ejector rod 4 is equal to that of the third ejector rod 19, and the length of the second ejector rod 11 is equal to that of the fourth ejector rod 27, and the length of the first ejector rod 4 is less than the length of the second ejector rod 11, when the piston 33 moves up to the top, it first contacts the first outer buffer structure 9 of the upper buffer structure 1, that is, when the piston 33 moves up to the top, it first contacts the second contact ring 12 of the first outer buffer structure 9, and during the continuous upward movement of the piston 33, it pushes the second contact ring 12, the four second ejector rods 11 and the second support ring 10 upward, and then compresses the second support spring 13 to achieve the primary buffer and shock absorption effect when the piston 33 moves up. If you want to increase the buffer force, you only need to turn the two threaded studs 15 to make the second pressure ring 14 move downward. At this time, the second pressure ring 14 can increase the extrusion force on the second support ring 10 through the second support spring 13, so as to achieve the effect of increasing the buffer force. On the contrary, if you want to reduce the buffer force, you only need to turn the two threaded studs 15 in the reverse direction; When the piston 33 continuously moves up and compresses the second contact ring 12 to be flush with the first contact ring 5, at this time, the piston 33 contacts both the second contact ring 12 and the first contact ring 5 at the same time. Based on the above, while continuously squeezing the second contact ring 12 upward, the first contact ring 5 is also squeezed upward. At this time, the movement of the first contact ring 5 is buffered through the connection of the four first ejector rods 4, the first support ring 3 and the first support spring 6, so as to cooperate with the buffer of the second contact ring 12 to achieve the secondary buffer and shock absorption effect when the piston 33 continuously moves up. If you want to increase the buffer force of the first contact ring 5, you only need to turn the two threaded studs 8 to make the first pressure ring 7 move downward and increase the extrusion force on the first support spring 6 and the first support ring 3. On the contrary, if you want to reduce the buffer force of the first contact ring 5, you only need to turn the two threaded studs 8 in the reverse direction.

[0021] Embodiment 2:

[0022] In view of the above Embodiment 1, a further description is made. Refer to Figures 8-12 , the buffer and shock absorption principle of the lower buffer structure of the hydraulic cylinder with a buffer structure of this type of emergency rescue machine is: When the hydraulic cylinder push rod 34 of this kind of hydraulic cylinder performs an inward contraction action and makes the piston 33 continuously approach the lower buffer structure 16 inside the hydraulic cylinder block 32, at this time, since the length of the first ejector rod 4 is equal to that of the third ejector rod 19, and the length of the second ejector rod 11 is equal to that of the fourth ejector rod 27, and the length of the first ejector rod 4 is less than the length of the second ejector rod 11, when the piston 33 moves down to the bottom end, it first contacts the outer buffer structure two 25 of the lower buffer structure 16, that is, when the piston 33 moves down to the bottom end, it first contacts the contact ring four 28, and when the piston 33 continuously moves down, it pushes the contact ring four 28 downward. At this time, through the connection of the four ejector rods 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 shock-absorbed. If you want to increase the buffering force of the downward movement of the contact ring four 28 and the piston 33, you only need to turn the adjusting nut 3101 to make the pressure plate four 30 move upward. At this time, the distance between the pressure plate four 30 and the lower end seat 1601 decreases, so as to further compress the support spring four 29 and achieve the effect of increasing the buffering force of the downward movement of the contact ring four 28 and the piston 33. On the contrary, if you want to reduce the buffering force of the downward movement of the contact ring four 28 and the piston 33, you only need to turn the adjusting nut 3101 in the reverse direction; 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 squeezes the contact ring four 28 and the contact ring three 20, and while the contact ring four 28 is buffered and shock-absorbed as described above, the piston 33 continues to squeeze the contact ring three 20. At this time, through the connection of the four ejector rods 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 shock-absorption of the downward movement of the piston 33. If you want to increase the buffering force of the contact ring three 20, you only need to turn 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 force of the contact ring three 20, you only need to turn the compression nut one 24 in the reverse direction.

[0023] The above is only the preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improvement concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hydraulic cylinder with a buffer structure for an emergency rescue machine, 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) respectively include an upper end seat (101) and a lower end seat (1601). An inner buffer structure one (2) and an outer buffer structure one (9) are arranged on the upper end seat (101). The inner buffer structure one (2) is sleeved inside the outer buffer structure one (9). An inner buffer structure two (17) and an outer buffer structure two (25) are arranged on the lower end seat (1601). The inner buffer structure two (17) is sleeved inside the outer buffer structure two (25). A through rod hole (102) is opened at the central position inside the upper end seat (101). The inner buffer structure one (2) includes a support ring one (3) sleeved outside the through rod hole (102). Four ejector rods one (4) are fixedly welded to the bottom of the support ring one (3). Through holes one (103) are opened on the upper end seat (101) corresponding to the four ejector rods one (4). The bottoms of the four ejector rods one (4) all penetrate through the through holes one (103) to the bottom of the upper end seat (101), and the bottoms of the four ejector rods one (4) are fixedly installed through screws and a contact ring one (5). The top of the support ring one (3) is connected to a pressure ring one (7) through a support spring one (6). Threaded studs one (8) are threadedly connected to both sides of the pressure ring one (7). Inner threaded holes one (104) are opened on the upper end seat (101) corresponding to the two threaded studs one (8). The bottoms of the threaded studs one (8) are threadedly connected to the inside of the corresponding inner threaded holes one (104).

2. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 1, characterized in that: The outer buffer structure one (9) includes a support ring two (10) sleeved outside the support ring one (3). Four ejector rods two (11) are fixedly welded to the bottom of the support ring two (10). Through holes two (105) are opened on the upper end seat (101) corresponding to the four ejector rods two (11). The bottoms of the four ejector rods two (11) all penetrate through the through holes two (105) to the bottom of the upper end seat (101), and the bottoms of the four ejector rods two (11) are fixedly installed through screws and a contact ring two (12). The top of the support ring two (10) is connected to a pressure ring two (14) through a support spring two (13). Threaded studs two (15) are threadedly connected to both sides of the pressure ring two (14). Inner threaded holes two (106) are opened on the upper end seat (101) corresponding to the two threaded studs two (15). The bottoms of the threaded studs two (15) are threadedly connected to the inside of the corresponding inner threaded holes two (106).

3. A hydraulic cylinder with a buffer structure for an emergency rescue machine according to claim 1, characterized in that: A lower ear seat (1605) is fixedly welded to the bottom of the lower end seat (1601), and an installation cavity is opened 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.

4. A hydraulic cylinder with a buffer structure for an emergency rescue machine according to claim 2, characterized in that: The inner buffer structure two (17) includes a support ring three (18) provided at the bottom of the lower end seat (1601). Four ejector rods three (19) are fixedly welded to the top of the support ring three (18). Through holes three (1602) are formed in the lower end seat (1601) at positions corresponding to the four ejector rods three (19). The tops of the four ejector rods three (19) all penetrate through the through holes three (1602) to the top of the lower end seat (1601). The ends of the tops of the four ejector rods three (19) are fixedly installed through screws and a contact ring three (20). The bottom of the support ring three (18) is connected to a pressure plate three (22) through a support spring three (21). A through hole one (2201) is formed at the central position of the pressure plate three (22). An installation screw one (23) is sleeved inside the through hole one (2201). The end of the installation screw one (23) is fixedly welded to the central position at the bottom of the lower end seat (1601). A compression nut one (24) is threadedly connected to the installation screw one (23) at the bottom of the through hole one (2201).

5. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 4, characterized in that: The outer buffer structure two (25) includes a support ring four (26) sleeved outside the support ring three (18). Four ejector rods four (27) are fixedly welded to the top of the support ring four (26). Through holes four (1603) are formed in the lower end seat (1601) at positions corresponding to the four ejector rods four (27). The tops of the four ejector rods four (27) all penetrate through the through holes four (1603) to the top of the lower end seat (1601). The ends of the tops of the four ejector rods four (27) are fixedly installed through screws and a contact ring four (28). The bottom of the support ring four (26) is connected to a pressure plate four (30) through a support spring four (29). A through hole two (3001) is formed at the central position of the pressure plate four (30). An installation screw two (31) is rotatably connected inside the through hole two (3001). An adjusting nut (3101) is fixedly welded to the installation screw two (31) at the bottom of the through hole two (3001). A docking threaded hole (1604) is formed at the bottom of the inner wall of the installation cavity corresponding to the position of the installation screw two (31). The bottom end of the installation screw two (31) is threadedly connected inside the docking threaded hole (1604).

6. The hydraulic cylinder with a buffer structure of an emergency rescue machine according to claim 5, characterized in that: The ejector rod one (4) and the ejector rod three (19) have the same length. The ejector rod two (11) and the ejector rod four (27) have the same length. The length of the ejector rod one (4) is less than the length of the ejector rod two (11).

7. A 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 installed through a hydraulic cylinder body (32). A piston (33) is slidably connected inside the hydraulic cylinder body (32). A hydraulic cylinder push rod (34) is fixedly installed at the top of the piston (33). The top of the hydraulic cylinder push rod (34) extends to the top of the outer buffer structure one (9) through the through rod hole (102).

8. A hydraulic cylinder with a buffer structure for an emergency rescue machine according to claim 7, characterized in that: One side of the outer walls of the upper seat (101) and the lower seat (1601) is fixedly installed with an oil pipe joint (35). An oil passage is provided inside the upper seat (101) or the lower seat (1601) at a position corresponding to the oil pipe joint (35). The other end of the oil passage is communicated with the inside of the hydraulic cylinder body (32).

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