Double-acting self-locking hydraulic cylinder

Abstract

The utility model discloses a double -acting self -locking hydraulic cylinder, its characterized in that: still include at least one detachablely cover set in the hydraulic cylinder body bottom's high stacking mechanism, the high stacking mechanism include the positioning slot of opening in top portion for accommodating hydraulic cylinder body or the bottom of last high stacking mechanism, be equipped with the circumferential limiting structure on the positioning slot, the hydraulic cylinder body bottom and high stacking mechanism bottom are equipped with with the cooperation structure of the circumferential limiting structure adaptation, the utility model discloses through increasing or reducing the quantity of high stacking mechanism, can like the nimble, linearly adjust the overall applicable height of hydraulic cylinder like building blocks, greatly expands its application scene, and the versatility is strong, simultaneously, through the circumferential limiting mechanism that the limiting block and the limiting slot constitute, realized the reliable connection between modular assembly, has guaranteed the stability and safety of whole structure when bearing complex load, especially torque.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a double-acting self-locking hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders, as common linear drive components, are widely used in various mechanical and engineering equipment. Traditional hydraulic cylinders have a fixed cylinder height, which limits their working stroke and installation space due to their inherent structure. In certain specific working conditions, such as when temporarily lifting heavy objects or operating on foundations of varying heights, a single hydraulic cylinder cannot meet diverse height requirements. Although the height can be adjusted using external components such as shims, this method suffers from poor stability, unreliable connections, and cumbersome operation. Furthermore, if a leak occurs in the pipeline during pressure holding, a conventional hydraulic cylinder cannot reliably lock its position, posing a safety hazard. Therefore, a double-acting self-locking hydraulic cylinder is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by proposing a double-acting self-locking hydraulic cylinder.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a double-acting self-locking hydraulic cylinder, comprising a hydraulic cylinder body, characterized in that: it further comprises at least one stacking mechanism detachably sleeved on the bottom of the hydraulic cylinder body; the stacking mechanism comprises a positioning groove formed on the top for accommodating the bottom of the hydraulic cylinder body or the previous stacking mechanism, the positioning groove being provided with a circumferential limiting structure, and the bottom of the hydraulic cylinder body and the bottom of the stacking mechanism being provided with a matching structure adapted to the circumferential limiting structure.

[0005] Preferably, the circumferential limiting structure is a limiting block, and the mating structure is a limiting groove.

[0006] Preferably, the stacking mechanism has several axially distributed protrusions on its outer circumference.

[0007] Preferably, the outer circumference of the positioning groove is provided with a groove that matches the protrusion.

[0008] Preferably, the bottom of the stacking mechanism is provided with an anti-slip pad.

[0009] Preferably, the stacking mechanism is a stacking mechanism with uniform height or a stacking mechanism with inconsistent height.

[0010] The beneficial effects of this utility model are: by increasing or decreasing the number of stacking mechanisms, the overall applicable height of the hydraulic cylinder can be adjusted flexibly and linearly like building blocks, which greatly expands its application scenarios and has strong versatility; at the same time, the circumferential limiting mechanism composed of limiting blocks and limiting grooves realizes reliable connection between modular components, ensuring the stability and safety of the entire structure when subjected to complex loads, especially torque. The combination of convex strips and grooves provides a clear guiding path for the docking of the stacking mechanism, ensuring that it can only be assembled at the correct angle. This makes the assembly process fast and accurate, strengthens the overall torsional resistance of the stacked mechanism, and effectively transmits and withstands the torque generated during operation. At the same time, the convex strip structure increases the radial dimension and external contact area of ​​the stacking mechanism's cylinder wall, thereby improving the stability of the stacked column when subjected to lateral forces and preventing overturning. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the stacking mechanism of this utility model; Figure 3 This is a schematic diagram of the stacking mechanism of this utility model from another perspective; Figure 4 This is a schematic diagram of the hydraulic cylinder body structure of this utility model; Figure 5 This is a top view of the hydraulic cylinder body of this utility model; Figure 6 This is a cross-sectional view AA of the hydraulic cylinder of this utility model; Figure 7 This is a cross-sectional view of the hydraulic cylinder BB of this utility model; Figure 8 This is a CC cross-sectional view of the hydraulic cylinder of this utility model.

[0012] Legend: 1. Hydraulic cylinder body; 101. Cylinder body; 102. Cylinder inner cavity; 103. Extended oil filling hole; 104. Bottom end cap; 105. Sealing plug; 106. Internal piston rod; 107. Internal piston rod cavity; 108. Oil return hole; 109. Retractable oil filling hole; 110. Extrusion ring; 111. Self-locking piston rod; 112. Self-locking piston rod cavity; 113. Self-locking nut; 114. Positioning guide sleeve; 115. Overflow valve; 2. Stacking mechanism; 21. Positioning groove; 22. Limiting block; 23. Limiting groove; 24. Protrusion; 25. Groove. Detailed Implementation

[0013] The following description, in conjunction with the accompanying drawings, further illustrates a double-acting self-locking hydraulic cylinder according to this utility model.

[0014] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0015] See appendix Figure 1-8 As shown, this embodiment of a double-acting self-locking hydraulic cylinder includes a hydraulic cylinder body 1, characterized in that: it further includes at least one stacking mechanism 2 detachably sleeved on the bottom of the hydraulic cylinder body 1; the stacking mechanism 2 includes a positioning groove 21 formed on the top for accommodating the bottom of the hydraulic cylinder body 1 or the previous stacking mechanism 2, the positioning groove 21 is provided with a circumferential limiting structure 22, and the bottom of the hydraulic cylinder body 1 and the bottom of the stacking mechanism 2 are provided with a matching structure adapted to the circumferential limiting structure; the circumferential limiting structure is a limiting block 22, and the matching structure is a limiting groove 23.

[0016] The stacking mechanism 2 is a ring or cylindrical structure made of high-strength alloy steel or aluminum alloy to ensure its structural strength and load-bearing capacity. Each stacking mechanism 2 has a positioning groove 21 on its top to accurately accommodate the hydraulic cylinder body 1 or the bottom of the previous stacking mechanism 2, achieving axial and radial positioning and support. The circumferential limiting structure and the mating mechanism can also be other mating structures that achieve circumferential limiting, such as key and keyway or polygonal mating. If the circumferential limiting structure is a limiting block 22 and the mating mechanism is a limiting groove 23, the insertion and mating of the limiting block 22 and the limiting groove 23 effectively prevents relative rotation between the hydraulic cylinder body 1 and the stacking mechanism 2, as well as between each stacking mechanism 2, during operation, ensuring the torsional stability of the entire support structure.

[0017] By increasing or decreasing the number of stacking mechanisms 2, the overall applicable height of the hydraulic cylinder can be adjusted flexibly and linearly, like building blocks, greatly expanding its application scenarios and making it highly versatile. At the same time, the circumferential limiting mechanism formed by the limiting block 22 and the limiting groove 23 realizes a reliable connection between modular components, ensuring the stability and safety of the entire structure when subjected to complex loads, especially torque.

[0018] See appendix Figure 2-3 As shown, the stacking mechanism 2 has several axially distributed protrusions 24 on its outer circumference; the positioning groove 21 has grooves 25 on its outer circumference that are adapted to the protrusions 24; the shape and number of the protrusions 24 and the grooves 25 are matched, so that when the upper and lower stacking mechanisms 2 are connected, the protrusions 24 on the outer circumference of the upper stacking mechanism 2 can be accurately embedded in the grooves 25 on the positioning groove 21 of the lower stacking mechanism 2, forming an integral structure with stronger anti-torsion performance; The cooperation between the protrusion 24 and the groove 25 provides a clear guiding path for the docking of the stacking mechanism 2, ensuring that it can only be assembled at the single correct angle. This makes the assembly process fast and accurate, strengthens the overall torsional resistance of the stacking mechanism 2 after stacking, and can effectively transmit and withstand the torque generated during operation. At the same time, the structure of the protrusion 24 increases the radial dimension and external contact area of ​​the cylinder wall of the stacking mechanism 2, thereby improving the stability of the stacked column when subjected to lateral forces and preventing overturning.

[0019] See appendix Figure 1-3 As shown, the bottom of the stacking mechanism 2 is provided with an anti-slip pad; the anti-slip pad can be made of materials with a high coefficient of friction such as rubber or polyurethane, and is attached or embedded in the bottom of the stacking mechanism 2 to increase the friction between the hydraulic cylinder and the ground or support surface and prevent slippage.

[0020] See appendix Figure 1-3 As shown, the stacking mechanism 2 can be a stacking mechanism with a uniform height or a stacking mechanism with inconsistent heights. Depending on the needs, the user can choose one or more stacking mechanisms 2 to combine. The stacking mechanism 2 is convenient for standardized production and calculation of the total height. Alternatively, several stacking mechanisms 2 with different heights can be prepared to make more flexible and precise height adjustments.

[0021] See appendix Figure 4-8 As shown, the hydraulic cylinder body 1 is a double-acting self-locking hydraulic cylinder, and its specific structure can be referred to in existing technology (such as patent document with publication date: 2022.03.08, publication number CN114151408A, entitled "A single-rod self-locking double-acting hydraulic actuator"). The hydraulic cylinder body 1 mainly includes a cylinder body 101, a cylinder inner cavity 102 opened in the cylinder body 101, an extended oil filling hole 103 located on the outside of the cylinder body 101 and communicating with the cylinder inner cavity 102, a bottom end cap 104 located at the rear end of the cylinder body 101, a sealing plug 105 connected to the bottom end cap 104 by threads, an internal piston rod 106 connected to the sealing plug 105 by threads, an internal piston rod cavity 107 opened in the internal piston rod 106, and an internal piston rod cavity 107 opened in the internal piston rod 106. The rod 106 has an oil return hole 108 that connects the built-in piston rod cavity 107 and the cylinder inner cavity 102; a retraction oil injection hole 109 that is set on the bottom end cap 104 and connects to the built-in piston rod cavity 107; a compression ring 110 that is fixedly installed at the front end of the built-in piston rod 106; a self-locking piston rod 111 that is set inside the cylinder inner cavity 102 and sleeved on the outside of the built-in piston rod 106; and a self-locking piston rod cavity 112 that is set between the self-locking piston rod 111 and the built-in piston rod 106.

[0022] The outer wall of the self-locking piston rod 111 is machined with a trapezoidal thread, and a trapezoidal self-locking nut 113 is connected to it through the trapezoidal thread, thereby forming a mechanical self-locking mechanism. The front port of the cylinder body 101 is threadedly connected to a guide sleeve 114 for guiding and limiting the extension movement of the self-locking piston rod 111. In addition, an overflow valve 115 for system overload protection can be provided on the outer wall of the cylinder body 101, which communicates with the built-in piston rod cavity 107.

[0023] When hydraulic oil enters the cylinder body cavity 102 through the extended oil injection hole 103, the pressurized oil pushes the self-locking piston rod 111 to extend outward. After the self-locking piston rod 111 extends to the required working position, the trapezoidal self-locking nut 113 can be tightened to make its front end face tightly abut against the end face of the positioning guide sleeve 114, thereby achieving mechanical locking. This mechanical self-locking mechanism ensures that even if the hydraulic system loses pressure or leaks, the self-locking piston rod 111 can be firmly locked in place, effectively preventing its unexpected retraction and ensuring the absolute reliability and safety of the support operation.

[0024] When it is necessary to retract the self-locking piston rod 111, the trapezoidal self-locking nut 113 must be loosened first to disengage it from the positioning guide sleeve 114; then, hydraulic oil is injected through the retraction oil injection hole 109, and the pressurized oil enters the self-locking piston rod cavity 112 through the built-in piston rod cavity 107 and the return oil hole 108, pushing the self-locking piston rod 111 to retract under the action of oil pressure.

[0025] The hydraulic cylinder body 1 integrates dual-acting hydraulic drive and mechanical self-locking functions. When used in conjunction with the stacking mechanism 2 of this utility model, it can not only flexibly adjust the total support height of the system through the stacking module, but also achieve stable and reliable mechanical locking at any extended position. It is particularly suitable for lifting and supporting operations that require long-term pressure holding, large load capacity, or high safety requirements.

[0026] When using this utility model, the user can select one or more stacking mechanisms 2 according to the target height requirement; during installation, align the positioning groove 21 at the top of the first stacking mechanism 2 with the bottom of the hydraulic cylinder body 1, so that the limiting block 22 in the positioning groove 21 is accurately embedded in the limiting groove 23 at the bottom of the hydraulic cylinder body 1, thus completing the first level of stacking. If further height needs to be increased, the second stacking mechanism 2 is fitted with its top positioning groove 21 aligned with the bottom of the first stacking mechanism 2. At this time, it is necessary to ensure that the two stacking mechanisms 2 are circumferentially aligned, so that the protrusion 24 on the outer circumference of the first stacking mechanism 2 is inserted into the groove 25 on the outer circumference of the positioning groove 21 of the second stacking mechanism 2, to achieve initial circumferential guidance and limitation. At the same time, the limiting block 22 in the positioning groove 21 of the second stacking mechanism 2 is also embedded into the limiting groove 23 at the bottom of the first stacking mechanism 2, thus forming a reliable axial connection and circumferential limitation. The subsequent stacking mechanism 2 is stacked sequentially in this manner until the required total height is reached. The disassembly process is the reverse of the above steps.

[0027] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A double-acting self-locking hydraulic cylinder, comprising a hydraulic cylinder body (1), characterized in that: It also includes at least one stacking mechanism (2) that is detachably fitted onto the bottom of the hydraulic cylinder body (1); the stacking mechanism (2) includes a positioning groove (21) on the top for accommodating the bottom of the hydraulic cylinder body (1) or the previous stacking mechanism (2), the positioning groove (21) is provided with a circumferential limiting structure, and the bottom of the hydraulic cylinder body (1) and the bottom of the stacking mechanism (2) are provided with a matching structure adapted to the circumferential limiting structure.

2. The double-acting self-locking hydraulic cylinder according to claim 1, characterized in that: The circumferential limiting structure is a limiting block (22), and the mating structure is a limiting groove (23).

3. A double-acting self-locking hydraulic cylinder according to claim 1, characterized in that: The stacking mechanism (2) has several axially distributed protrusions (24) on its outer circumference.

4. A double-acting self-locking hydraulic cylinder according to claim 1, characterized in that: The positioning groove (21) has a groove (25) on its outer circumference that matches the protrusion (24).

5. A double-acting self-locking hydraulic cylinder according to claim 3, characterized in that: The bottom of the stacking mechanism (2) is provided with an anti-slip pad.

6. A double-acting self-locking hydraulic cylinder according to claim 5, characterized in that: The stacking mechanism (2) is either a stacking mechanism with a uniform height or a stacking mechanism with a non-uniform height.

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