Anti-impact telescopic oil cylinder for crane

Abstract

The utility model relates to the technical field of hydraulic telescopic oil cylinders, in particular to an anti-impact telescopic oil cylinder for a crane. The buffering device comprises an oil cylinder, a piston rod, a lower limiting ring, a buffering spring a, an upper limiting ring, a sliding assembly and a buffering rod. The buffering spring a is vertically arranged in the buffering groove and located in the lower limiting ring, the upper limiting ring is slidably arranged in the sliding assembly, the buffering rod is arranged in the sliding assembly and slidably arranged in the buffering groove, the tail end of the buffering rod abuts against the buffering spring a, and the outer diameter of the buffering rod is larger than the inner diameter of the lower limiting ring. Through the arrangement of the lower limiting ring and the upper limiting ring, when the buffer spring a is stretched, the upper limiting ring limits the movement of the sliding assembly, and the buffer spring a is prevented from being excessively stretched; when the buffer spring a is compressed, the lower limiting ring limits movement of the buffer rod, and the buffer spring a is prevented from being excessively compressed. The buffer spring a is prevented from exceeding the elastic limit and losing efficacy, and the service life of the buffer spring a is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic telescopic oil cylinders, in particular to an impact-proof telescopic oil cylinder for a crane. Background Art

[0002] Telescopic hydraulic cylinder is composed of two or more piston hydraulic cylinders. The piston rod of the first piston cylinder is the cylinder of the second piston cylinder. Telescopic hydraulic cylinder is also called multi-stage hydraulic cylinder. When the pressure oil enters from the rodless chamber, the cylinder with the largest piston effective area begins to extend. When it reaches the end, the cylinder with the second largest piston effective area begins to extend. The order of telescopic hydraulic extension is from large to small, which can obtain a long working stroke. The smaller the effective area of ​​the extended cylinder, the faster the extension speed. When the piston rod extends quickly, it will impact the surface of the object, which is easy to cause damage to the object and the top of the piston rod.

[0003] Chinese patent publication number CN217055805U discloses a bidirectional anti-impact hydraulic telescopic cylinder for a truck crane. By setting an upper protection mechanism and a lower protection mechanism, the top of the piston rod and the bottom of the inner wall of the cylinder body can be prevented from being damaged by impact force, thereby extending the service life of the cylinder and creating good conditions for the normal use of the subsequent cylinder.

[0004] However, the above patent has the following shortcomings:

[0005] The telescopic oil cylinder is protected against the impact force at the top of the piston rod by arranging a buffer spring in the upper protection mechanism. The compression amount of the buffer spring a is easy to exceed the elastic limit and thus fail. Utility Model Content

[0006] The utility model aims to solve the problems existing in the background technology and proposes an anti-impact telescopic oil cylinder for cranes which can prevent a buffer spring from exceeding its elastic limit and thus becoming ineffective and prolong the service life of the buffer spring.

[0007] The technical solution of the utility model is an impact-proof telescopic oil cylinder for a crane, comprising an oil cylinder, a piston rod, a lower limit ring, a buffer spring a, an upper limit ring, a sliding assembly and a buffer rod; the piston rod is slidably arranged in the oil cylinder, a buffer groove is arranged on the top of the piston rod, the lower limit ring is arranged at the bottom of the buffer groove, the buffer spring a is vertically arranged in the buffer groove and the buffer spring a is located inside the lower limit ring, the upper limit ring is arranged on the top of the piston rod, the upper limit ring is slidably arranged in the sliding assembly, the sliding assembly is slidably arranged on the outside of the piston rod, the buffer rod is arranged in the sliding assembly and the buffer rod is slidably arranged in the buffer groove, the end of the buffer rod abuts against the buffer spring a, and the outer diameter of the buffer rod is larger than the inner diameter of the lower limit ring.

[0008] Preferably, it also includes a limit rod, which is vertically arranged at the bottom of the buffer groove and located inside the lower limit ring. The buffer spring a is sleeved on the outside of the limit rod, and a limit groove for the limit rod to be inserted is arranged inside the buffer rod.

[0009] Preferably, it also includes a fixed block and a buffer sleeve, wherein the fixed block is threadedly arranged on the top of the sliding assembly, and the buffer sleeve is sleeved on the outside of the fixed block.

[0010] Preferably, the sliding assembly includes a sliding ring and a mounting sleeve, the sliding ring is slidably arranged on the outside of the piston rod, the upper limit ring is slidably arranged inside the sliding ring, the inner diameter of the sliding ring is larger than the outer diameter of the buffer rod, the mounting sleeve is threadedly arranged on the outside of the sliding ring, and the buffer rod is arranged on the mounting sleeve.

[0011] Preferably, it also includes a bottom plate and a support frame, the bottom surface of the oil cylinder is arranged on the bottom plate, and the support frame is arranged on the top surface and the bottom plate of the oil cylinder.

[0012] Preferably, it also includes a rotating sleeve, an arc plate, a buffer ball, an air spring and two groups of lower buffer assemblies. The rotating sleeve has a closed thread arranged at the bottom of the oil cylinder, the two groups of lower buffer assemblies are symmetrically arranged at the bottom of the rotating sleeve, the arc plate is rotatably arranged on the two groups of lower buffer assemblies, the buffer ball is arranged on the arc plate, and the two ends of the air spring are respectively arranged on the rotating sleeve and the arc plate.

[0013] Preferably, the lower buffer assembly includes a sliding rod, a limit sleeve, a sliding block, a buffer spring b and a connecting rod. The sliding rod is horizontally arranged in the rotating sleeve, the limit sleeve is arranged in the rotating sleeve, the sliding rod is located in the limit sleeve, the sliding block is slidably arranged on the sliding rod, the buffer spring b is sleeved on the sliding rod and its two ends are respectively arranged on the rotating sleeve and the sliding block, and the two ends of the connecting rod are respectively rotatably arranged on the sliding block and the arc plate.

[0014] Preferably, it also includes a rotating block, a through hole is arranged on the bottom plate, the through hole is connected to the bottom of the oil cylinder, the rotating block is arranged at the bottom of the rotating sleeve and is located in the through hole, and a mounting blind hole is arranged at the bottom of the rotating block.

[0015] Compared with the prior art, the utility model has the following beneficial technical effects:

[0016] 1. The utility model sets a lower limit ring and an upper limit ring. When the buffer spring a is stretched, the upper limit ring limits the movement of the sliding component to prevent the buffer spring a from being overstretched; when the buffer spring a is compressed, the lower limit ring limits the movement of the buffer rod to prevent the buffer spring a from being overcompressed. The buffer spring a is prevented from exceeding the elastic limit and thus failing, thereby extending the service life of the buffer spring a.

[0017] 2. The utility model sets a sliding component and sets the installation sleeve thread on the sliding ring. After a period of use, the installation sleeve is removed by rotating the thread, and the buffer spring a can be taken out of the buffer groove for replacement, thereby extending the service life of the telescopic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2 A partial cross-sectional view of a piston rod in an embodiment of the utility model;

[0020] Figure 3 It is a partial cross-sectional view of the oil cylinder in the embodiment of the utility model.

[0021] : Illustrations: 1. cylinder; 2. piston rod; 201. buffer groove; 3. lower limit ring; 4. buffer spring a; 5. upper limit ring; 6. sliding assembly; 601. sliding ring; 602. mounting sleeve; 7. buffer rod; 8. limit rod; 9. fixed block; 10. buffer sleeve; 11. base plate; 111. through hole; 12. support frame; 13. rotating sleeve; 14. lower buffer assembly; 141. sliding rod; 142. limit sleeve; 143. sliding block; 144. buffer spring b; 145. connecting rod; 15. arc plate; 16. buffer ball; 17. air spring; 18. rotating block; 181. mounting blind hole. DETAILED DESCRIPTION Example

[0022] like Figure 1-Figure 3 As shown, the impact-proof telescopic cylinder for a crane proposed in this embodiment includes a cylinder 1, a piston rod 2, a lower limit ring 3, a buffer spring a4, an upper limit ring 5, a sliding assembly 6 and a buffer rod 7; the piston rod 2 is slidably arranged in the cylinder 1, a buffer groove 201 is arranged on the top of the piston rod 2, the lower limit ring 3 is arranged at the bottom of the buffer groove 201, the buffer spring a4 is vertically arranged in the buffer groove 201 and the buffer spring a4 is located inside the lower limit ring 3, the upper limit ring 5 is arranged on the top of the piston rod 2, the upper limit ring 5 is slidably arranged in the sliding assembly 6, the sliding assembly 6 is slidably arranged on the outside of the piston rod 2, the buffer rod 7 is arranged in the sliding assembly 6 and the buffer rod 7 is slidably arranged in the buffer groove 201, the end of the buffer rod 7 abuts on the buffer spring a4, and the outer diameter of the buffer rod 7 is larger than the inner diameter of the lower limit ring 3.

[0023] When in use, hydraulic oil is introduced into the oil cylinder 1 to drive the piston rod 2 to extend, the sliding assembly 6 first abuts against the object, and the buffer rod 7 compresses the buffer spring a4 to buffer the impact force to prevent damage to the piston rod 2 and the object. During compression, the buffer rod 7 abuts against the lower limit ring 3 to prevent the buffer spring a4 from being over-compressed, preventing the buffer spring a from exceeding the elastic limit and thus failing, thereby extending the service life of the buffer spring a. Example

[0024] like Figure 2 As shown, the anti-impact telescopic oil cylinder for crane proposed in this embodiment, compared with the first embodiment, in this embodiment, further includes a limit rod 8, the limit rod 8 is vertically arranged at the bottom of the buffer groove 201 and the limit rod 8 is located inside the lower limit ring 3, the buffer spring a4 is sleeved on the outside of the limit rod 8, and the buffer rod 7 is provided with a limit groove for the limit rod 8 to be inserted. The anti-impact telescopic oil cylinder for crane also includes a fixed block 9 and a buffer sleeve 10, the fixed block 9 is threadedly arranged on the top of the sliding assembly 6, and the buffer sleeve 10 is sleeved on the outside of the fixed block 9. The sliding assembly 6 includes a sliding ring 601 and a mounting sleeve 602, the sliding ring 601 is slidably arranged on the outside of the piston rod 2, the upper limit ring 5 is slidably arranged in the sliding ring 601, the inner diameter of the sliding ring 601 is larger than the outer diameter of the buffer rod 7, the mounting sleeve 602 is threadedly arranged on the outside of the sliding ring 601, and the buffer rod 7 is arranged on the mounting sleeve 602.

[0025] In this embodiment, the limit rod 8 is provided to prevent the buffer spring a4 from deflecting during compression or extension. By inserting the limit rod 8 into the buffer rod 7, the position of the buffer rod 7 can be positioned, which is convenient for installation. By providing the buffer sleeve 10, the impact force on the top of the piston rod 2 can be further buffered, and it is convenient for replacement. By threading the mounting sleeve 602 on the sliding ring 601, the mounting sleeve 602 can be removed after a period of use, which is convenient for replacing the buffer spring a4 and extending the service life of the telescopic cylinder. Example

[0026] like Figure 1 and Figure 3As shown, the anti-impact telescopic oil cylinder for crane proposed in this embodiment, compared with the first embodiment, in this embodiment, further includes a bottom plate 11 and a support frame 12, the bottom surface of the oil cylinder 1 is arranged on the bottom plate 11, and the support frame 12 is arranged on the top surface of the oil cylinder 1 and the bottom plate 11. The anti-impact telescopic oil cylinder for crane also includes a rotating sleeve 13, an arc plate 15, a buffer ball 16, an air spring 17 and two groups of lower buffer components 14, the rotating sleeve 13 is sealed and threadedly arranged at the bottom of the oil cylinder 1, the two groups of lower buffer components 14 are symmetrically arranged at the bottom of the rotating sleeve 13, the arc plate 15 is rotatably arranged on the two groups of lower buffer components 14, the buffer ball 16 is arranged on the arc plate 15, and the two ends of the air spring 17 are respectively arranged on the rotating sleeve 13 and the arc plate 15. The lower buffer assembly 14 includes a sliding rod 141, a limiting sleeve 142, a sliding block 143, a buffer spring b144 and a connecting rod 145. The sliding rod 141 is horizontally arranged in the rotating sleeve 13, the limiting sleeve 142 is arranged in the rotating sleeve 13, the sliding rod 141 is located in the limiting sleeve 142, the sliding block 143 is slidably arranged on the sliding rod 141, the buffer spring b144 is sleeved on the sliding rod 141 and its two ends are respectively arranged on the rotating sleeve 13 and the sliding block 143, and the two ends of the connecting rod 145 are respectively rotatably arranged on the sliding block 143 and the arc plate 15. The anti-impact telescopic oil cylinder for the crane also includes a rotating block 18, a through hole 111 is arranged on the bottom plate 11, the through hole 111 is connected to the bottom of the oil cylinder 1, the rotating block 18 is arranged at the bottom of the rotating sleeve 13 and is located in the through hole 111, and a mounting blind hole 181 is arranged at the bottom of the rotating block 18.

[0027] In this embodiment, the rotating sleeve 13 is installed at the bottom of the cylinder 1 by installing the blind hole 181. When the piston rod 2 is retracted, it abuts against the buffer ball 16 for buffering. The arc plate 15 is pressed downward to drive the connecting rod 145 to rotate. The sliding block 143 compresses the buffer spring b144 to buffer the impact force, and the limit sleeve 142 limits the compression amount of the buffer spring b144.

[0028] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Anti-impact telescopic cylinder for crane, characterized in that: It comprises an oil cylinder (1), a piston rod (2), a lower limit ring (3), a buffer spring a (4), an upper limit ring (5), a sliding assembly (6) and a buffer rod (7); The piston rod (2) is slidably arranged in the oil cylinder (1); a buffer groove (201) is arranged at the top of the piston rod (2); a lower limit ring (3) is arranged at the bottom of the buffer groove (201); a buffer spring a (4) is vertically arranged in the buffer groove (201) and the buffer spring a (4) is located inside the lower limit ring (3); an upper limit ring (5) is arranged at the top of the piston rod (2); the upper limit ring (5) is slidably arranged in a sliding assembly (6); the sliding assembly (6) is slidably arranged outside the piston rod (2); a buffer rod (7) is arranged in the sliding assembly (6) and the buffer rod (7) is slidably arranged in the buffer groove (201); a distal end of the buffer rod (7) abuts against the buffer spring a (4); and an outer diameter of the buffer rod (7) is greater than an inner diameter of the lower limit ring (3).

2. The impact-proof telescopic cylinder for a crane according to claim 1, characterized in that: It also includes a limiting rod (8), the limiting rod (8) is vertically arranged at the bottom of the buffer groove (201) and the limiting rod (8) is located inside the lower limiting ring (3), the buffer spring a (4) is sleeved on the outside of the limiting rod (8), and a limiting groove for the limiting rod (8) to be inserted is arranged inside the buffer rod (7).

3. The impact-proof telescopic cylinder for a crane according to claim 1, characterized in that: It also includes a fixed block (9) and a buffer sleeve (10), wherein the fixed block (9) is threadedly arranged on the top of the sliding assembly (6), and the buffer sleeve (10) is sleeved on the outside of the fixed block (9).

4. The impact-proof telescopic cylinder for a crane according to claim 1, characterized in that: The sliding assembly (6) comprises a sliding ring (601) and a mounting sleeve (602); the sliding ring (601) is slidably arranged on the outside of the piston rod (2); the upper limit ring (5) is slidably arranged inside the sliding ring (601); the inner diameter of the sliding ring (601) is larger than the outer diameter of the buffer rod (7); the mounting sleeve (602) is threadedly arranged on the outside of the sliding ring (601); and the buffer rod (7) is arranged on the mounting sleeve (602).

5. The impact-proof telescopic cylinder for a crane according to claim 1, characterized in that: It also includes a bottom plate (11) and a support frame (12), wherein the bottom surface of the oil cylinder (1) is arranged on the bottom plate (11), and the support frame (12) is arranged on the top surface of the oil cylinder (1) and the bottom plate (11).

6. The impact-proof telescopic cylinder for a crane according to claim 5, characterized in that: The invention also comprises a rotating sleeve (13), an arc plate (15), a buffer ball (16), an air spring (17) and two groups of lower buffer components (14); the rotating sleeve (13) is sealedly threadedly arranged at the bottom of the oil cylinder (1); the two groups of lower buffer components (14) are symmetrically arranged at the bottom of the rotating sleeve (13); the arc plate (15) is rotatably arranged on the two groups of lower buffer components (14); the buffer ball (16) is arranged on the arc plate (15); and the two ends of the air spring (17) are respectively arranged on the rotating sleeve (13) and the arc plate (15).

7. The impact-proof telescopic cylinder for a crane according to claim 6, characterized in that: The lower buffer assembly (14) comprises a sliding rod (141), a limiting sleeve (142), a sliding block (143), a buffer spring b (144) and a connecting rod (145); the sliding rod (141) is horizontally arranged in the rotating sleeve (13); the limiting sleeve (142) is arranged in the rotating sleeve (13); the sliding rod (141) is located in the limiting sleeve (142); the sliding block (143) is slidably arranged on the sliding rod (141); the buffer spring b (144) is sleeved on the sliding rod (141) and its two ends are respectively arranged on the rotating sleeve (13) and the sliding block (143); and the two ends of the connecting rod (145) are respectively rotatably arranged on the sliding block (143) and the arc plate (15).

8. The impact-proof telescopic cylinder for a crane according to claim 6, characterized in that: It also comprises a rotating block (18), a through hole (111) being provided on the bottom plate (11), the through hole (111) being communicated with the bottom of the oil cylinder (1), the rotating block (18) being arranged at the bottom of the rotating sleeve (13) and located in the through hole (111), and a mounting blind hole (181) being provided at the bottom of the rotating block (18).

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