A multi-stage hydraulic cylinder synchronous control structure

Abstract

This utility model discloses a multi-stage hydraulic cylinder synchronous control structure, relating to the field of hydraulic cylinder technology. It includes: a cylinder barrel, with a primary slide rod slidably connected to the inner wall of the cylinder barrel, and a secondary slide rod slidably connected to the inner wall of the primary slide rod. A synchronization device is installed inside the cylinder barrel, and a limit device is installed outside the synchronization device. This utility model achieves synchronized movement of the primary and secondary slide rods through a gear transmission mechanism using the synchronization device. When hydraulic oil is injected into the cylinder barrel to drive the secondary slide rod to move, the transmission chain composed of a connecting block, connecting rod, and driving rod transmits the motion to the driving gear. Through the meshing relationship between the driving gear and the actuating gear, the rotation is converted into a thrust on the primary slide rod. The moving distance of the secondary slide rod can be converted into a corresponding displacement of the primary slide rod through gear transmission, ensuring that the extension and retraction speeds of the two are matched.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a multi-stage hydraulic cylinder synchronous control structure. Background Technology

[0002] In industrial production, multistage hydraulic cylinders are widely used in engineering machinery, automated production lines, and metallurgical equipment due to their large extension stroke and compact structure. However, the deficiencies in synchronization control and safety protection of traditional multistage hydraulic cylinders have always been key issues restricting their performance improvement.

[0003] In terms of synchronization control, traditional multi-stage hydraulic cylinders rely primarily on the distribution of hydraulic oil flow to achieve synchronized extension and retraction of each slide rod. When hydraulic oil is injected into the cylinder, it drives the movement of different slide rods by pushing their piston surfaces. However, in this method, the viscosity of the hydraulic oil changes with temperature, leading to uneven force distribution on different slide rods. Furthermore, the differences in the length and diameter of the oil lines corresponding to each slide rod cause variations in hydraulic oil flow resistance, resulting in deviations in the extension and retraction speeds and strokes between the first and second stage slide rods. Utility Model Content

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: a multi-stage hydraulic cylinder synchronous control structure, comprising: a cylinder barrel, a first-stage slide rod slidably connected to the inner wall of the cylinder barrel, a second-stage slide rod slidably connected to the inner wall of the first-stage slide rod, a synchronization device disposed inside the cylinder barrel, a limit device disposed outside the synchronization device, and a moving groove formed on the outer wall of the first-stage slide rod; the synchronization device includes a connecting block, connecting rods symmetrically fixedly connected to the outer wall of the connecting block, a drive rod fixedly connected to the outer wall of the connecting rod, and a connecting handle disposed outside the drive rod.

[0005] Preferably, the outer wall of the connecting block is fixedly connected to the top end of the secondary slide rod, and the outer wall of the drive rod is slidably connected to the inner wall of the cylinder. When hydraulic oil is injected into the cylinder, as the secondary slide rod slides along the inner wall of the primary slide rod, the connecting block fixed at its top end will simultaneously drive the connecting rods on both sides to move, thereby pushing the drive rod to slide along the inner wall of the cylinder.

[0006] Preferably, a drive gear is rotatably connected to the inner wall of the connecting handle, and the drive gear meshes with a toggle gear. The toggle gear meshes with a toggle groove, and the drive gear meshes with the inner wall of the drive rod. The outer wall of the connecting handle is fixedly connected to the outer wall of the cylinder. The inner wall of the drive rod has toothed grooves. The drive rod drives the drive gear inside the connecting handle to rotate through the meshing relationship of the inner walls. The drive gear further meshes with the toggle gear, causing the toggle gear to roll along the toggle groove on the outer wall of the first-stage slide rod. Due to the meshing relationship between the toggle gear and the toggle groove, its rotation is converted into a thrust on the first-stage slide rod, forcing the first-stage slide rod to slide along the inner wall of the cylinder.

[0007] Preferably, the limiting device includes a limiting cylinder, a limiting rod is slidably connected to the inner wall of the limiting cylinder, a slot is provided in the wall of the limiting rod, and a fixing block is fixedly connected to the top end of the limiting rod.

[0008] Preferably, the bottom end of the limiting cylinder is fixedly connected to the outer wall of the cylinder, and the end of the fixing block away from the limiting rod is fixedly connected to the outer wall of the connecting block. When the secondary slide rod moves the connecting block, the connecting block will pull the limiting rod along the inner wall of the limiting cylinder through the fixing block. The slot in the limiting rod wall moves synchronously with it. When the slide rod extends or retracts to the preset position, the locking block on the outer wall of the limiting cylinder will engage with the corresponding slot under the elastic force of the torsion spring, thus mechanically restricting the continued movement of the limiting rod.

[0009] Preferably, a locking block is rotatably connected to the outer wall of the limiting cylinder, a torsion spring is fixedly connected to the outer surface of the locking block, the end of the torsion spring away from the locking block is fixedly connected to the outer wall of the limiting cylinder, and the outer wall of the locking block is slidably connected to the inner wall of the locking groove.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model achieves synchronized movement of the primary slide rod and the secondary slide rod by setting up a synchronization device and using a gear transmission mechanism. When hydraulic oil is injected into the cylinder to drive the secondary slide rod to move, the transmission chain composed of the connecting block, connecting rod, and driving rod transmits the motion to the driving gear. Then, through the meshing relationship between the driving gear and the actuating gear, the rotation is converted into a thrust on the primary slide rod. The moving distance of the secondary slide rod can be converted into the corresponding displacement of the primary slide rod through gear transmission, ensuring that the extension and retraction speeds of the two are matched.

[0012] 2. This utility model provides travel protection for multi-stage slide rods by setting a limiting device and a mechanical locking structure. When the second-stage slide rod drives the connecting block to move, the limiting rod slides synchronously with the fixed block. When the slide rod extends or retracts to the preset position, the locking block is locked into the slot under the elastic force of the torsion spring. By limiting the movement of the limiting rod, the second-stage slide rod and the first-stage slide rod are indirectly locked, preventing them from losing pressure due to hydraulic oil leakage or external impact. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the limiting device of this utility model;

[0015] Figure 3 This is a utility model Figure 2 Enlarged view of the structure at point B;

[0016] Figure 4 This is a schematic diagram of the synchronization device of this utility model;

[0017] Figure 5 This is a utility model Figure 4 Enlarged view of the structure at point A.

[0018] In the diagram: 1. Cylinder; 2. First-stage slide bar; 3. Second-stage slide bar; 4. Actuating groove; 6. Synchronizing device; 61. Connecting block; 62. Connecting rod; 63. Drive rod; 64. Connecting handle; 65. Drive gear; 66. Actuating gear; 7. Limiting device; 71. Limiting cylinder; 72. Limiting rod; 73. Slot; 74. Fixing block; 75. Locking block; 76. Torsion spring. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] Example:

[0021] Please see Figure 1 - Figure 5 This utility model provides a technical solution: a multi-stage hydraulic cylinder synchronous control structure, including: a cylinder 1, a first-stage slide rod 2 slidably connected to the inner wall of the cylinder 1, a second-stage slide rod 3 slidably connected to the inner wall of the first-stage slide rod 2, a synchronization device 6 is provided inside the cylinder 1, a limit device 7 is provided outside the synchronization device 6, and a moving groove 4 is provided on the outer wall of the first-stage slide rod 2; the synchronization device 6 includes a connecting block 61, a connecting rod 62 is symmetrically fixedly connected to the outer wall of the connecting block 61, a drive rod 63 is fixedly connected to the outer wall of the connecting rod 62, and a connecting handle 64 is provided outside the drive rod 63.

[0022] The outer wall of the connecting block 61 is fixedly connected to the top of the secondary slide rod 3, and the outer wall of the drive rod 63 is slidably connected to the inner wall of the cylinder 1.

[0023] A drive gear 65 is rotatably connected to the inner wall of the connecting handle 64. The drive gear 65 is meshed with a toggle gear 66. The toggle gear 66 meshes with the toggle groove 4. The drive gear 65 meshes with the inner wall of the drive rod 63. The outer wall of the connecting handle 64 is fixedly connected to the outer wall of the cylinder 1.

[0024] The limiting device 7 includes a limiting cylinder 71, a limiting rod 72 is slidably connected to the inner wall of the limiting cylinder 71, a slot 73 is provided in the wall of the limiting rod 72, and a fixing block 74 is fixedly connected to the top of the limiting rod 72.

[0025] The bottom end of the limiting cylinder 71 is fixedly connected to the outer wall of the cylinder 1, and the end of the fixing block 74 away from the limiting rod 72 is fixedly connected to the outer wall of the connecting block 61.

[0026] A locking block 75 is rotatably connected to the outer wall of the limiting cylinder 71. A torsion spring 76 is fixedly connected to the outer surface of the locking block 75. The end of the torsion spring 76 away from the locking block 75 is fixedly connected to the outer wall of the limiting cylinder 71. The outer wall of the locking block 75 is slidably connected to the inner wall of the locking groove 73.

[0027] Working principle:

[0028] In use, via the synchronization device 6, when hydraulic oil is injected into the cylinder 1, the secondary slide rod 3 slides along the inner wall of the primary slide rod 2. Simultaneously, the connecting block 61 fixed at its top drives the connecting rods 62 on both sides to move, thereby pushing the drive rod 63 to slide along the inner wall of the cylinder 1. At this time, the drive rod 63 drives the drive gear 65 inside the connecting handle 64 to rotate through the meshing relationship of the inner wall. The drive gear 65 further meshes with the actuating gear 66, causing the actuating gear 66 to roll along the actuating groove 4 on the outer wall of the primary slide rod 2. Due to the meshing relationship between the actuating gear 66 and the actuating groove 4, its rotation is converted into a thrust on the primary slide rod 2, forcing the primary slide rod 2 to slide along the inner wall of the cylinder 1. Through the tooth ratio design of the drive gear 65 and the actuating gear 66, the moving distance of the secondary slide rod 3 is converted into the corresponding displacement of the primary slide rod 2 through gear transmission, thus achieving synchronous extension and retraction of both.

[0029] When the secondary slide rod 3 moves the connecting block 61 via the limiting device 7, the connecting block 61 pulls the limiting rod 72 along the inner wall of the limiting cylinder 71 via the fixing block 74. The slot 73 in the wall of the limiting rod 72 moves synchronously with it. When the slide rod extends to the preset position, the locking block 75 on the outer wall of the limiting cylinder 71 will be locked into the corresponding slot 73 under the elastic force of the torsion spring 76. The mechanical locking restricts the continued movement of the limiting rod 72, and thus indirectly restricts the movement of the secondary slide rod 3 and the primary slide rod 2 via the connecting block 61, preventing the slide rod from slipping due to pressure loss caused by leakage of the cylinder 1 or external impact. If it is necessary to release the limit, the locking block 75 can be pushed by external force to compress the torsion spring 76 and disengage it from the slot 73. At this time, the limiting rod 72 can slide freely again, ensuring the normal operation of the multi-stage slide rod.

[0030] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A multi-stage hydraulic cylinder synchronization control structure, characterized by, include: A cylinder (1) is provided with a first-stage slide rod (2) slidably connected to the inner wall of the cylinder (1), and a second-stage slide rod (3) slidably connected to the inner wall of the first-stage slide rod (2). A synchronization device (6) is provided inside the cylinder (1), and a limit device (7) is provided outside the synchronization device (6). A push groove (4) is provided on the outer wall of the first-stage slide rod (2). The synchronization device (6) includes a connecting block (61), and a connecting rod (62) is symmetrically fixedly connected to the outer wall of the connecting block (61). A driving rod (63) is fixedly connected to the outer wall of the connecting rod (62), and a connecting handle (64) is provided on the outside of the driving rod (63).

2. The multi-stage hydraulic cylinder synchronization control structure according to claim 1, characterized in that: The outer wall of the connecting block (61) is fixedly connected to the top of the secondary slide rod (3), and the outer wall of the drive rod (63) is slidably connected to the inner wall of the cylinder (1).

3. The multi-stage hydraulic cylinder synchronization control structure of claim 1, wherein: The inner wall of the connecting handle (64) is rotatably connected to a drive gear (65), which is meshed with a toggle gear (66). The toggle gear (66) meshes with a toggle groove (4), and the drive gear (65) meshes with the inner wall of the drive rod (63). The outer wall of the connecting handle (64) is fixedly connected to the outer wall of the cylinder (1).

4. The multi-stage hydraulic cylinder synchronization control structure of claim 1, wherein: The limiting device (7) includes a limiting cylinder (71), a limiting rod (72) is slidably connected to the inner wall of the limiting cylinder (71), a slot (73) is provided in the wall of the limiting rod (72), and a fixing block (74) is fixedly connected to the top end of the limiting rod (72).

5. The multi-stage hydraulic cylinder synchronization control structure according to claim 4, characterized in that: The bottom end of the limiting cylinder (71) is fixedly connected to the outer wall of the cylinder (1), and the end of the fixing block (74) away from the limiting rod (72) is fixedly connected to the outer wall of the connecting block (61).

6. The multi-stage hydraulic cylinder synchronization control structure according to claim 5, characterized in that: The outer wall of the limiting cylinder (71) is rotatably connected to a locking block (75), and a torsion spring (76) is fixedly connected to the outer surface of the locking block (75). The end of the torsion spring (76) away from the locking block (75) is fixedly connected to the outer wall of the limiting cylinder (71), and the outer wall of the locking block (75) is slidably connected to the inner wall of the slot (73).

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