Multi-stage composite telescopic hydraulic cylinder for heavy load

Abstract

The invention relates to the technical field of telescopic columns, and discloses a heavy-load multistage composite telescopic hydraulic cylinder which comprises a shell assembly, a telescopic assembly and a driving assembly, the shell assembly comprises an outer barrel, a sleeve assembly and a sleeve, and the sleeve is installed in the outer barrel in a matched mode; a sleeve body assembly is installed in a cavity formed between the outer barrel body and the sleeve body, the telescopic assembly comprises a telescopic rod and an ejector rod, the telescopic rod is installed in the sleeve body, the ejector rod is installed at the telescopic end of the sleeve body, the driving assembly comprises a pipe body, and the rotating pipe body drives air in the outer barrel body to flow circularly. The telescopic rod, the ejector rod and the sleeve body which are detachable are installed in the outer cylinder body, the telescopic assembly installed in the outer cylinder body can be replaced conveniently, and after long-time use, the telescopic assembly is detached, so that maintenance of the telescopic assembly is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of telescopic columns, in particular to a multi-stage composite telescopic hydraulic cylinder for heavy loads. Background Art

[0002] Multi-stage telescopic hydraulic cylinders are widely used in heavy machinery, engineering equipment, and large-scale building support applications due to their long travel and high load capacity. However, traditional hydraulic cylinder structures suffer from two core issues: insufficient stability and maintenance difficulties under long-term heavy load conditions, which affect the service life and operational efficiency of the equipment.

[0003] Conventional technology uses flanges to connect to the base, but these tend to loosen under prolonged vibration or impact loads, requiring frequent tightening. This approach struggles to balance high fixing strength with maintainability, especially when internal components of the hydraulic cylinder wear out, often requiring complete replacement, increasing time and financial costs. Summary of the Invention

[0004] The object of the present invention is to provide a heavy-load multi-stage compound telescopic hydraulic cylinder to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a multi-stage compound telescopic hydraulic cylinder for heavy loads, comprising: The shell assembly includes an outer cylinder, a sleeve assembly and a sleeve body, the sleeve body is installed in the outer cylinder, and the sleeve assembly is installed in the cavity formed between the outer cylinder and the sleeve body; The outer cylinder is installed underground, the opening of the outer cylinder is flush with the ground, a pin is installed at the bottom of the outer cylinder, and the cavity of the pin is connected to the interior of the outer cylinder; A groove is provided on the outer side of the sleeve assembly; A telescopic assembly, comprising a telescopic rod and a push rod, wherein the telescopic rod is mounted inside the sleeve, and the push rod is mounted on the telescopic end of the sleeve; The driving assembly includes a tube body, and the rotating tube body drives the air inside the outer cylinder to circulate.

[0006] Furthermore, a plurality of columns are provided on the peripheral side surface of the outer cylinder, the columns are inclined upward, two special-shaped holes are opened on the bottom of the outer cylinder, a plurality of convex strips are provided on the peripheral side surface of the pin, the pin is a hollow structure, the upper end of the pin is provided with an opening, the lower end of the pin is a pointed end, and the port of the pin is fitted and installed in the special-shaped hole.

[0007] Furthermore, a first extension body is provided on the outer side of the opening of the outer cylinder, a deep groove is provided on the upper end surface of the first extension body, a plurality of slots connected to the deep groove are provided on the peripheral side of the first extension body, a plurality of first mounting holes are passed through the bottom surface of the deep groove, the upper and lower ends of the sleeve have openings, a second extension body is provided on the outer side of the upper end opening of the sleeve, a plurality of limiting protrusions are provided on the peripheral side of the second extension body, a plurality of third mounting holes are provided on the second extension body, the sleeve is installed inside the outer cylinder, and the second extension body is located in the deep groove, the limiting protrusions are cooperated and installed in the corresponding slots, the first mounting hole corresponds to the third mounting hole one by one, and the fixing bolt passes through the through hole formed by the first mounting hole and the third mounting hole.

[0008] Furthermore, the sleeve assembly includes half shells, and the two half shells are spliced ​​into a cylindrical structure. The top of the cylindrical structure is fixed by a sleeved ring, and the cylindrical structure is sleeved on the bottom of the sleeve.

[0009] Furthermore, a groove body is provided on the outer surface of the half shell, and the side of the groove body is close to the mounting surface of the half shell. The bottom surface of the groove body is penetrated by a guide hole and a circular hole, and the circular hole is located in the middle position of the bottom surface of the groove body. There are two guide holes, and the two guide holes are respectively located on both sides of the circular hole. The upper end of the half shell is provided with a long groove connected to the interior of the half shell, and a number of ridges are evenly distributed on the inner side surface of the outer cylinder. The half shell is mounted in cooperation with the interior of the outer cylinder, and the limiting groove is mounted in cooperation with the ridge. A driving assembly is installed on the bottom surface of the groove body, and the upper port of the tube body extends into the half shell through the guide hole, and the bottom end of the tube body extends into the inside of the pin.

[0010] Furthermore, the drive assembly includes a shell, the protrusion of the shell fits in the circular hole, a motor is installed inside the shell, the output end of the motor is connected to the second transmission wheel through a first transmission wheel, there are several first transmission wheels, and several first transmission wheels and the second transmission wheels constitute a planetary gear assembly, a driven wheel is sleeved on the tube body, the driven wheel is located in the shell, and the driven wheel is connected to the second transmission wheel through a third transmission wheel, a spiral blade is provided inside the tube body, and the opening of the shell is closed by a cover.

[0011] Furthermore, a limiting ring is provided at the top of the tube body, and the top of the tube body passes through the second mounting hole. The limiting ring is located in the cavity formed by the semi-shell and the sleeve. A spring is sleeved on the tube body, and the spring is located between the limiting ring and the inner wall of the semi-shell. A plurality of protrusions are provided at the upper end of the tube body, and the protrusions cooperate with the long groove provided inside the driven wheel.

[0012] Furthermore, a chassis is provided at the bottom of the telescopic rod, and a plurality of bayonet holes are provided on the circumference of the chassis. The bayonet holes correspond to the guide holes or the second mounting holes, and a first screw is installed in the through hole formed between the second mounting holes corresponding to the bayonet holes.

[0013] Furthermore, the push rod is fixedly connected to the telescopic end of the telescopic rod by a second screw, and a ring seat is provided at the bottom end of the push rod, and the outer diameter of the ring seat is the same as the inner diameter of the sleeve.

[0014] Furthermore, a base is sleeved on the outer side of the outer cylinder, a cavity is formed between the outer cylinder and the base, and a water inlet and a water outlet communicated with the cavity are provided on the base.

[0015] The present invention has the following beneficial effects: 1. The present invention has a detachable telescopic rod, a top rod and a sleeve installed in the outer cylinder, which facilitates the replacement of the telescopic assembly installed inside the outer cylinder. After long-term use, the telescopic assembly can be disassembled to achieve maintenance of the telescopic assembly.

[0016] 2. In the present invention, when the push rod moves upward, the ring seat separates from the top of the tube body, and the tube body moves upward under the action of the spring, so that the protrusion cooperates with the long groove provided inside the driven wheel. During the operation of the motor, the driven wheel drives the tube body to rotate through the constructed planetary gear. The interior of the tube body is provided with spiral blades. At the same time, the top of the tube body is connected with the interior of the push rod and the interior of the sleeve to realize the propulsion of air.

[0017] 3. In the present invention, when the push rod extends out of the sleeve, it comes into contact with the external air, thereby changing the temperature of the air inside the cavity formed by the push rod and the sleeve. The temperature increase or decrease affects the viscosity of the hydraulic oil stored in the telescopic rod. The pins extend into the cooling water, so that the temperature inside the cavity formed by the push rod and the sleeve is close to the temperature inside the pins, thereby keeping the temperature change amplitude of the cavity formed by the push rod and the sleeve small and maintaining the stability of the telescopic rod during movement.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 paying any creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the explosion structure of the present invention; Figure 4 This is a schematic diagram of the outer cylinder structure of the present invention; Figure 5 This is a schematic diagram of the structure of the drive assembly of the present invention; Figure 6 Schematic diagram of the tube structure of the present invention; Figure 7 This is a schematic diagram of the outer cylinder structure of the present invention; Figure 8 This is a schematic diagram of the sleeve structure of the present invention; Figure 9 This is a schematic structural diagram of the sleeve assembly of the present invention; Figure 10 This is a schematic diagram of the half-shell structure of the present invention; Figure 11 This is a schematic diagram of the base installation of the present invention; In the accompanying drawings, the components represented by the reference numerals are as follows: Figure: 1, outer cylinder; 101, first extension; 102, slot; 103, deep groove; 104, first mounting hole; 105, ridge; 106, column; 107, special-shaped hole; 2, pin; 3, drive assembly; 301, housing; 302, motor; 303, first transmission wheel; 304, second transmission wheel; 305, third transmission wheel; 306, driven wheel; 307, tube; 3071, limit ring; 3072, protrusion; 308, spring; 4 , sleeve assembly; 401, half shell; 4011, groove body; 4012, guide hole; 4013, round hole; 4014, second mounting hole; 4015, limiting groove; 4016, long groove; 402, ring body; 5, telescopic rod; 501, chassis; 5011, bayonet; 6, top rod; 601, ring seat; 7, sleeve body; 701, second extension body; 702, limiting protrusion; 703, third mounting hole; 8, first screw; 9, second screw; 10, base. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1 - Figure 10 As shown, the present invention is a heavy-load multi-stage compound telescopic hydraulic cylinder, comprising: The shell assembly includes an outer cylinder 1, a sleeve assembly 4 and a sleeve 7. The sleeve 7 is installed in the outer cylinder 1, and the sleeve assembly 4 is installed in the cavity formed between the outer cylinder 1 and the sleeve 7. The outer cylinder 1 is installed underground, the opening of the outer cylinder 1 is flush with the ground, and a pin 2 is installed at the bottom of the outer cylinder 1, and the cavity of the pin 2 is connected to the interior of the outer cylinder 1; A groove 4011 is provided on the outer side of the sleeve assembly 4; The telescopic assembly includes a telescopic rod 5 and a push rod 6. The telescopic rod 5 is installed inside the sleeve 7, and the push rod 6 is installed on the telescopic end of the sleeve 7; The driving assembly 3 includes a tube body 307 , and the rotating tube body 307 drives the air inside the outer cylinder 1 to circulate.

[0023] Since a plurality of columns 106 are evenly distributed on the outer surface of the outer cylinder 1, the columns 106 increase the contact area with the cooling water in the cavity, thereby improving the heat exchange effect. By dissipating heat to the outer cylinder 1, the temperature is kept stable.

[0024] Several columns 106 are provided on the peripheral side of the outer cylinder 1, two special-shaped holes 107 are provided on the bottom of the outer cylinder 1, and several convex strips are provided on the peripheral side of the pin 2. The pin 2 is a hollow structure, the upper end of the pin 2 is provided with an opening, the lower end of the pin 2 is a pointed end, and the port of the pin 2 is fitted in the special-shaped hole 107. The pin 2 is located in the cooling water, and heat exchange is achieved through the pin 2 shell. The pin 2 is made of heat-conducting metal.

[0025] A first extension body 101 is provided on the outside of the opening of the outer cylinder 1, and a deep groove 103 is provided on the upper end surface of the first extension body 101. A plurality of slots 102 connected to the deep groove 103 are provided on the peripheral side of the first extension body 101, and a plurality of first mounting holes 104 are passed through the bottom surface of the deep groove 103. The upper and lower ends of the sleeve 7 have openings. A second extension body 701 is provided on the outside of the upper end opening of the sleeve 7, and a plurality of limiting protrusions 702 are provided on the peripheral side of the second extension body 701. A plurality of third mounting holes 703 are provided on the second extension body 701. The sleeve 7 is installed inside the outer cylinder 1, and the second extension body 701 is located in the deep groove 103. The limiting protrusions 702 are cooperated and installed in the corresponding slots 102. The first mounting hole 104 corresponds to the third mounting hole 703 one by one, and the fixing bolt passes through the through hole formed by the first mounting hole 104 and the third mounting hole 703.

[0026] The sleeve assembly 4 includes a half shell 401 , and the two half shells 401 are spliced ​​into a cylindrical structure. The top of the cylindrical structure is fixed by a sleeved ring 402 , and the cylindrical structure is sleeved on the bottom of the sleeve 7 .

[0027] A groove body 4011 is provided on the outer surface of the half shell 401, and the groove body 4011 is close to the side of the mounting surface of the half shell 401. The bottom surface of the groove body 4011 is penetrated by a guide hole 4012 and a circular hole 4013. The circular hole 4013 is located in the middle position of the bottom surface of the groove body 4011. There are two guide holes 4012, and the two guide holes 4012 are respectively located on both sides of the circular hole 4013. The upper end of the half shell 401 is provided with a long groove 4016 that communicates with the interior of the half shell 401. A plurality of ridges 105 are evenly distributed on the inner side surface of the outer cylinder 1. The half shell 401 is mounted in cooperation with the interior of the outer cylinder 1, and the limiting groove 4015 is mounted in cooperation with the ridge 105. The driving assembly 3 is installed on the bottom surface of the groove body 4011. The upper end of the tube body 307 extends into the half shell 401 through the guide hole 4012, and the bottom end of the tube body 307 extends into the interior of the pin 2.

[0028] The drive assembly 3 includes a shell 301, the protrusion of the shell 301 fits in the circular hole 4013, and a motor 302 is installed inside the shell 301. The output end of the motor 302 is connected to the second transmission wheel 304 through the first transmission wheel 303. There are several first transmission wheels 303, and several first transmission wheels 303 and second transmission wheels 304 constitute a planetary gear assembly. A driven wheel 306 is sleeved on the tube body 307, and the driven wheel 306 is located in the shell 301. The driven wheel 306 is connected to the second transmission wheel 304 through the third transmission wheel 305. A spiral blade is provided inside the tube body 307, and the opening of the shell 301 is closed by a cover.

[0029] A retaining ring 3071 is provided at the top of the tube body 307. The top of the tube body 307 passes through the second mounting hole 4014. The retaining ring 3071 is located in the cavity formed by the half shell 401 and the sleeve 7. A spring 308 is sleeved on the tube body 307 and located between the retaining ring 3071 and the inner wall of the half shell 401. The upper end of the tube body 307 is provided with a plurality of protrusions 3072, which cooperate with the long grooves provided inside the driven wheel 306. After the telescopic rod 5 drives the push rod 6 to fully retract, the ring seat 601 pushes the limit ring 3071 to compress the spring 308, so that the protrusion 3072 is disengaged from the long groove provided inside the driven wheel 306, thereby preventing the driven wheel 306 from driving the tube body 307 to rotate.

[0030] A chassis 501 is provided at the bottom of the telescopic rod 5, and a plurality of bayonet holes 5011 are provided on the circumference of the chassis 501. The bayonet holes 5011 correspond to the guide holes 4012 or the second mounting holes 4014. The first screw 8 is installed in the through hole formed between the second mounting holes 4014 corresponding to the bayonet holes 5011.

[0031] The push rod 6 is fixedly connected to the telescopic end of the telescopic rod 5 by a second screw 9 . A ring seat 601 is provided at the bottom end of the push rod 6 . The outer diameter of the ring seat 601 is the same as the inner diameter of the sleeve 7 .

[0032] During the installation process, the water inlet is connected to the water supply pipe, and the water outlet is connected to the drainage pipe, and the outer shell of the outer cylinder 1 and the hydraulic oil inside the outer cylinder 1 are dissipated by the flowing cooling water; The outer cylinder 1 and the sleeve 7 are limited by the provided slot 102 and the limiting protrusion 702, thereby achieving the positioning installation of the sleeve 7, facilitating the alignment of the third mounting hole 703 with the first mounting hole 104 after installation, and facilitating quick installation; The pins 2 installed on the bottom surface of the outer cylinder 1 extend into the ground. A half shell 401 is installed inside the outer cylinder 1. The half shell 401 has a groove 4011 that communicates with the interior of the pins 2. The upper end of the groove 4011 has a long groove 4016, which communicates with the interior of the sleeve 7 through the air guide hole provided on the sleeve 7. A light hole is formed at the upper end of the sleeve 7, and the push rod 6 slides up and down along the light hole. During the extension of the telescopic rod 5, the telescopic rod 5 pushes the top end of the push rod 6 to extend along the light hole. When the telescopic rod 5 is extended to the maximum, the ring seat 601 of the push rod 6 is located above the air guide hole of the sleeve 7. At this time, the air guide hole is connected to the interior of the push rod 6 and the interior of the sleeve 7. When the push rod 6 moves upward, the ring seat 601 is separated from the top of the tube body 307, and the tube body 307 moves upward under the action of the spring 308, so that the protrusion 3072 cooperates with the long groove provided inside the driven wheel 306. During the operation of the motor 302, the driven wheel 306 drives the tube body 307 to rotate through the planetary gear. The interior of the tube body 307 is provided with spiral blades. At the same time, the top of the tube body 307 is connected with the interior of the push rod 6 and the interior of the sleeve 7. The rotating tube 307 drives the air inside the push rod 6 and the sleeve 7 to move toward the side of the pin 2. The air inside the pin 2 enters the groove 4011. The air inside the groove 4011 enters the interior of the sleeve 7 through the long groove 4016 and the air guide hole of the sleeve 7, thereby realizing air circulation. When the push rod 6 extends out of the sleeve 7, it comes into contact with the outside air, thereby changing the temperature of the air inside the cavity formed by the push rod 6 and the sleeve 7. The temperature increase or decrease affects the viscosity of the hydraulic oil stored in the telescopic rod 5. The pin 2 extends into the ground, so that the temperature inside the cavity formed by the push rod 6 and the sleeve 7 is close to the temperature inside the pin 2, thereby keeping the temperature variation of the cavity formed by the push rod 6 and the sleeve 7 small and maintaining the stability of the telescopic rod 5 during movement.

[0033] like Figure 11 As shown, a base 10 is sleeved on the outer side of the outer cylinder 1, a cavity is formed between the outer cylinder 1 and the base 10, and a water inlet and a water outlet communicating with the cavity are provided on the base 10; The water inlet and the water outlet are distributed up and down, the water inlet is connected to the upper end of the forming cavity, and the water outlet is connected to the lower end of the forming cavity; Since a plurality of columns 106 are evenly distributed on the outer surface of the outer cylinder 1, the columns 106 increase the contact area with the cooling water in the cavity, thereby improving the heat exchange effect and achieving heat dissipation. By dissipating heat to the outer cylinder 1, the temperature inside the equipment is reduced under high load conditions.

[0034] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A heavy-load multi-stage compound telescopic hydraulic cylinder, characterized in that: include: A shell assembly, the outer shell assembly comprising an outer cylinder (1), a sleeve assembly (4) and a sleeve (7), the sleeve (7) being fitted in the outer cylinder (1), and the sleeve assembly (4) being fitted in a cavity formed between the outer cylinder (1) and the sleeve (7); The outer cylinder (1) is installed underground, the opening of the outer cylinder (1) is flush with the ground, a pin (2) is installed at the bottom of the outer cylinder (1), and the cavity of the pin (2) is connected to the interior of the outer cylinder (1); A groove (4011) is provided on the outer side of the sleeve assembly (4); A telescopic assembly, the telescopic assembly comprising a telescopic rod (5) and a push rod (6), the telescopic rod (5) being mounted inside a sleeve (7), and the push rod (6) being mounted on the telescopic end of the sleeve (7); A drive assembly (3), the drive assembly (3) comprising a tube body (307), wherein the rotating tube body (307) drives the air inside the outer cylinder (1) to circulate.

2. A heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 1, characterized in that: The bottom of the outer cylinder (1) is provided with two special-shaped holes (107); The pin (2) is provided with a plurality of ridges on its peripheral side surface. The pin (2) is a hollow structure. The upper end of the pin (2) is provided with an opening. The lower end of the pin (2) is a pointed end. The port of the pin (2) is fitted into the special-shaped hole (107).

3. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 1, characterized in that: A first extension body (101) is provided on the outer side of the opening of the outer cylinder (1), a deep groove (103) is provided on the upper end surface of the first extension body (101), a plurality of slots (102) in communication with the deep groove (103) are provided on the circumferential side of the first extension body (101), and a plurality of first mounting holes (104) are passed through the bottom surface of the deep groove (103); The sleeve (7) has openings at both the upper and lower ends. A second extension (701) is provided outside the upper opening of the sleeve (7). A plurality of position-limiting protrusions (702) are provided on the circumference of the second extension (701). A plurality of third mounting holes (703) are provided on the second extension (701). The sleeve (7) is installed inside the outer cylinder (1), while the second extension (701) is located in the deep groove (103), and the limiting protrusion (702) is installed in the corresponding slot (102); The first mounting hole (104) corresponds to the third mounting hole (703) one by one, and the fixing bolt passes through a through hole formed by the first mounting hole (104) and the third mounting hole (703).

4. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 1, characterized in that: The sleeve assembly (4) comprises a half shell (401), wherein the two half shells (401) are spliced ​​together to form a cylindrical structure, the top of the cylindrical structure is fixed by a sleeved ring (402), and the cylindrical structure is sleeved on the bottom of the sleeve (7).

5. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 4, characterized in that: A groove body (4011) is provided on the outer surface of the half shell (401), and a guide hole (4012) and a circular hole (4013) are passed through the bottom surface of the groove body (4011) on the side close to the mounting surface of the half shell (401). The circular hole (4013) is located in the middle of the bottom surface of the groove body (4011). There are two guide holes (4012), and the two guide holes (4012) are respectively located on both sides of the circular hole (4013); The upper end of the half shell (401) is provided with a long groove (4016) communicating with the interior of the half shell (401); A plurality of ridges (105) are evenly distributed on the inner side surface of the outer cylinder (1), and the half shell (401) is mounted in cooperation with the interior of the outer cylinder (1), while the limiting groove (4015) is mounted in cooperation with the ridges (105); The bottom surface of the trough body (4011) is equipped with a driving assembly (3), the upper end of the tube body (307) extends into the semi-shell (401) through the guide hole (4012), and the bottom end of the tube body (307) extends into the interior of the pin (2).

6. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 5, characterized in that: The drive assembly (3) comprises a housing (301), wherein a protrusion of the housing (301) fits in a circular hole (4013); A motor (302) is installed inside the housing (301), and an output end of the motor (302) is connected to a second transmission wheel (304) via a first transmission wheel (303). There are a plurality of first transmission wheels (303), and the plurality of first transmission wheels (303) and the second transmission wheels (304) form a planetary gear assembly; A driven wheel (306) is sleeved on the tube body (307), the driven wheel (306) is located in the housing (301), and the driven wheel (306) is connected to the second transmission wheel (304) through the third transmission wheel (305); The interior of the tube body (307) is provided with spiral blades; The opening of the housing (301) is closed by a cover.

7. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 6, characterized in that: A limiting ring (3071) is provided at the top end of the tube body (307), the top end of the tube body (307) passes through the second mounting hole (4014), the limiting ring (3071) is located in the cavity formed by the half shell (401) and the sleeve (7), a spring (308) is sleeved on the tube body (307), and the spring (308) is located between the limiting ring (3071) and the inner wall of the half shell (401); The upper end of the tube body (307) is provided with a plurality of protrusions (3072), and the protrusions (3072) cooperate with the long grooves provided inside the driven wheel (306).

8. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 7, characterized in that: A chassis (501) is provided at the bottom of the telescopic rod (5), and a plurality of bayonet holes (5011) are provided on the circumference of the chassis (501), wherein the bayonet holes (5011) correspond to the guide holes (4012) or the second mounting holes (4014); A first screw (8) is installed in a through hole formed between the second mounting holes (4014) corresponding to the bayonet (5011).

9. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 8, characterized in that: The top rod (6) is fixedly connected to the telescopic end of the telescopic rod (5) via a second screw (9); A ring seat (601) is provided at the bottom end of the push rod (6), and the outer diameter of the ring seat (601) is the same as the inner diameter of the sleeve body (7).

10. The heavy-load multi-stage compound telescopic hydraulic cylinder according to claim 1, characterized in that: A base (10) is sleeved on the outer side of the outer cylinder (1), a cavity is formed between the outer cylinder (1) and the base (10), and a water inlet and a water outlet communicating with the cavity are provided on the base (10).

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