A separable hydraulic jack with extensible top rod
By installing expandable, detachable hydraulic rods and extension modules on the hydraulic jack, the problem of limited support range of traditional hydraulic jacks is solved. It enables automatic expansion of the support surface within a small range, increases the support area, is suitable for various support positions, reduces construction costs, and avoids workpiece damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 河南省远基岩土工程有限公司
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional hydraulic jacks have limited support and lifting range, requiring the preparation of various models. They are also prone to slippage, tilting, or excessive local pressure at different support positions, resulting in high construction costs and workpiece damage.
Design a detachable hydraulic jack with an expandable jack rod. By setting a retractable expansion mechanism on the hydraulic rod, including a detachable expansion module and a sliding device, the support surface can be automatically expanded within a small range to increase the support area.
It enables automatic expansion of the support surface within a small area, increasing the support area, reducing construction preparation costs, avoiding slippage and excessive local pressure, and is suitable for various support positions.
Smart Images
Figure CN224394490U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of hydraulic jacks, and specifically relates to a detachable hydraulic jack with an expandable jack rod. Background Technology
[0002] Traditional hydraulic jacks typically consist of a base with an oil chamber, pump, piston, and valve, and a hydraulic rod for lifting or supporting. However, the diameter of the hydraulic rod is fixed, for example, a fixed diameter (e.g., 70mm), limiting the support area. Therefore, different models of hydraulic jacks need to be selected based on the structure being supported or lifted, requiring multiple models for a single project, wasting manpower and resources and increasing construction costs. Furthermore, using hydraulic jacks with large support areas makes it difficult to fit them into smaller support locations. Conversely, using smaller jacks for supporting or lifting larger surfaces, such as pipe inner wall support, lifting irregularly shaped structures, or basement foundation lifting, can easily lead to slippage and tilting, and excessive local pressure may damage the workpiece. Utility Model Content
[0003] To address the limitations in the support and lifting range of existing hydraulic jacks, this invention proposes a detachable hydraulic jack with an expandable jack rod. The support surface of the hydraulic jack is expanded by setting a retractable hydraulic rod top support.
[0004] The purpose of this utility model and the technical problem it solves are achieved by the following technical solution. According to this utility model, a detachable hydraulic jack with an expandable jack rod is proposed, including a hydraulic cylinder and a hydraulic rod that is telescopically connected via the hydraulic cylinder. Both the hydraulic cylinder and the hydraulic rod are disposed in a mounting hole for mounting the hydraulic cylinder. The hydraulic rod is also provided with an extension mechanism that can be telescopically connected via the mounting hole, the extension mechanism being used to expand the support area of the hydraulic rod.
[0005] As an improvement to the above technical solution, the expansion mechanism consists of several separable expansion modules that are slidably connected at the top of the hydraulic rod via a sliding device. The expansion modules are stacked sequentially and then slidably connected via the sliding device.
[0006] As a further improvement to the above technical solution, the expansion module includes at least two support blocks with corresponding fan-shaped connecting surfaces and support surfaces, wherein the support surface is larger than the connecting surface. The arc-shaped connecting surface and the support surface are connected by an arc-shaped inclined surface, and the sliding device is set through the connecting surface.
[0007] As a further improvement to the above technical solution, the straight line segment between the fan-shaped connecting surface and the supporting surface of the expansion module is connected by a surface perpendicular to it.
[0008] As an improvement to the above technical solution, the radius of the arc segment of the connecting surface is smaller than the radius of the hydraulic rod, and the radius of the supporting surface is less than or equal to the radius of the hydraulic rod.
[0009] As an improvement to the above technical solution, the expansion blocks in each expansion module are arranged in a frustum shape after shrinking.
[0010] As an improvement to the above technical solution, the sliding device includes a sliding groove and a slider. The sliding groove is disposed on the top of the hydraulic rod and on the support surface of the previous expansion module connected to the expansion module. The slider is disposed on the connecting surface. The expansion module is slidably configured through the cooperation of the sliding groove and the slider.
[0011] As a further improvement to the above technical solution, the sliding device also includes a spring-loaded structure, which is used to connect the hydraulic rod and an extension module disposed on the top of the hydraulic rod, as well as the extension module and another extension module superimposed on the extension module.
[0012] As a further improvement to the above technical solution, the springback structure is a spring disposed between the slide groove and the slider.
[0013] The beneficial effects of this utility model through the above technical solution are:
[0014] The hydraulic jack of this invention has an expansion mechanism for extending the support surface at the top of the hydraulic rod. In extreme cases, by combining the expansion mechanism with the installation position, the expansion mechanism can automatically expand the support surface in a small space without affecting the installation, thereby increasing the support area and expanding the application range of the hydraulic jack.
[0015] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, preferred embodiments are given below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description
[0016] Figure 1 This is a perspective view of the single-layer expansion module of this utility model inside the mounting hole.
[0017] Figure 2 This is a perspective view of the single-layer expansion module of this utility model outside the mounting hole.
[0018] Figure 3 This is a top view of the single-layer expansion module of this utility model outside the mounting hole.
[0019] Figure 4 This is an isometric drawing of the hydraulic rod of this utility model.
[0020] Figure 5 This is an isometric view of the support block of this utility model.
[0021] Figure 6 This is a schematic diagram of the retracted state of the multi-layer expansion module of this utility model on the hydraulic rod.
[0022] Figure 7 This is an isometric view of the multi-layer expansion module of this utility model in the retracted state on the hydraulic rod.
[0023] Figure 8 This is a schematic diagram of the multi-layer expansion module of this utility model in its expanded state on a hydraulic rod.
[0024] Figure 9 This is an isometric view of the extended state of the multi-layer extension module of this utility model on a hydraulic rod.
[0025] Figure 10 This is a top view of the multi-layer expansion module of this utility model in its expanded state on a hydraulic rod.
[0026] In the picture:
[0027] 1. Hydraulic cylinder; 2. Hydraulic rod; 3. Mounting hole; 4. Support block; 5. Connecting surface; 6. Supporting surface; 7. Slide groove; 8. Slider; 9. Springback structure. Detailed Implementation
[0028] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and preferred embodiments.
[0029] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.
[0030] Reference Figure 1 , Figure 2 , Figure 6A detachable hydraulic jack with an expandable jack rod is disclosed, particularly suitable for applications such as pipe wall support, jacking of irregular structures, and basement foundation jacking. In use, it needs to be installed in a small mounting hole 3, but after the hydraulic rod 2 extends, it is necessary to lift or support a larger structure. Therefore, the expandable detachable hydraulic jack includes a hydraulic cylinder 1 and a hydraulic rod 2 that extends and retracts through the hydraulic cylinder 1. Both the hydraulic cylinder 1 and the hydraulic rod 2 are installed in the mounting hole 3. The hydraulic rod 2 also has an extension mechanism that extends and retracts through the mounting hole 3 to increase the support area 6 of the hydraulic rod 2. The extension mechanism can be retracted during installation, allowing the entire hydraulic jack to be installed in the mounting hole 3. During use, the hydraulic rod 2 extends, and the extension mechanism on the hydraulic rod 2 provides support, thereby increasing the support area 6 of the hydraulic rod 2.
[0031] Reference Figure 1 , Figure 2 , Figure 3 In one embodiment of this application, the expansion module is configured with only one layer. The single-layer expansion module is directly slidably connected to the top of the hydraulic rod 2 via a sliding device. When the expansion module is configured with a single layer, the supporting force is greater and the support is more stable. Specifically, the expansion module includes at least two support blocks 4 with corresponding fan-shaped connecting surfaces 5 and supporting surfaces 6, and the supporting surfaces 6 are larger than the connecting surfaces 5. Preferably, three support blocks 4 are provided, and the angle between the three support blocks 4 is 120°.
[0032] When there are three support blocks 4 in the expansion module, the connecting surface 5 and the support surface 6 on each support block 4 are arranged in a fan shape. The arc-shaped segments of the connecting surface 5 and the support surface 6 are connected by an arc-shaped inclined surface. The straight segments between the connecting surface 5 and the support surface 6 of the expansion module are connected by a surface perpendicular to them. The arc-shaped inclined surface can not only adapt to the fan-shaped structure of the connecting surface 5 and the support surface 6, but also set the surface of the expansion module that contacts the mounting hole 3 during installation as an inclined surface. In this way, when the inclined surface contacts the edge of the mounting hole 3, it is squeezed by the edge of the mounting hole 3, thereby realizing the contraction of the support block 4 towards the center of the hydraulic rod 2.
[0033] Furthermore, to ensure that the inclined surface of the expansion module can fit into the edge of the mounting hole 3 when it retracts, thereby causing the mounting hole 3 to compress the inclined surface, the radius of the arc segment of the connecting surface 5 is smaller than the radius of the hydraulic rod 2. To ensure that the expansion module can fully enter the mounting hole 3 when it retracts, the radius of the supporting surface 6 is also smaller than or equal to the radius of the hydraulic rod 2.
[0034] The sliding device is positioned between the support block 4 and the hydraulic rod 2 via the connecting surface 5. When the hydraulic rod 2 retracts into the mounting hole 3, the three support blocks 4 are simultaneously compressed by the edges of the mounting hole 3 and retract synchronously towards the center. Until the retraction is complete, the vertical connecting surfaces 5 between adjacent support blocks 4 come into contact with each other during retraction, causing the connecting surfaces 5 and support surfaces 6 of the three support blocks 4 to form a complete circular plane, resulting in an inverted frustum shape. During expansion, the hydraulic rod 2 extends, the support blocks 4 disengage from the compression of the mounting hole 3, and the three support blocks 4 separate from each other via the sliding device. A gap exists between the vertical surfaces of adjacent support blocks 4, at which point the support surface 6 forms an enlarged support surface 6 with a gap, effectively enlarging the support surface 6 on the hydraulic rod 2.
[0035] Reference Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 In a second embodiment of this application, the expansion module is configured in multiple layers, with the multiple expansion modules stacked on top of each other. The first layer of the multi-layered expansion module is directly slidably connected to the top of the hydraulic rod 2 via a sliding device, while the remaining layers are slidably connected to the expansion modules stacked below them via sliding devices. This multi-layered expansion module configuration can further expand the support surface area 6 of the hydraulic rod 2, thus broadening its application range.
[0036] Specifically, each expansion module includes at least two support blocks 4 with corresponding fan-shaped connecting surfaces 5 and supporting surfaces 6, where the supporting surfaces 6 are larger than the connecting surfaces 5. Similar to a single-layer expansion module, each expansion module has three support blocks 4, with an angle of 120° between them. When there are three support blocks 4 in each expansion module, the arrangement of the connecting surfaces 5 and supporting surfaces 6 on each support block 4 is also the same as that on a single-layer expansion module.
[0037] When configured as a multi-layer expansion module, the sliding device of the first layer is located between the support block 4 and the hydraulic rod 2 via the connecting surface 5. However, the sliding devices on the superimposed support blocks 4 are located between the connecting surface 5 of the support block 4 of the upper layer and the supporting surface 6 of the support block 4 of the lower layer. When the hydraulic rod 2 retracts into the mounting hole 3, the expansion module of the first layer first contacts the edge of the mounting hole 3 and retracts. After retraction, the multi-layer expansion modules superimposed on top sequentially contact the edge of the mounting hole 3 and retract sequentially. Until the retraction is complete, the vertical connecting surfaces 5 between adjacent support blocks 4 contact each other during retraction, so that the connecting surfaces 5 and supporting surfaces 6 of the three support blocks 4 in each layer form a complete circular plane, and the three support blocks 4 form a multi-layered inverted frustum shape. During expansion, the hydraulic rod 2 extends, and each layer of support block 4 sequentially disengages from the compression of the mounting hole 3. The three support blocks 4 separate from each other through a sliding device, and there is a gap between the vertical surfaces of two adjacent support blocks 4. At this time, the support surface 6 forms an enlarged support surface 6 with gaps. At this time, the support surface 6 of each layer expands further on the basis of the expansion of the support surface 6 of the next layer, realizing multiple enlargements of the support surface 6 on the hydraulic rod 2.
[0038] In other embodiments of this application, the support block 4 in the expansion module can be set to two or more. When there are two or more support blocks 4, the arrangement of the support surface 6 and the connecting surface 5 is the same as that of three support blocks 4. With two support blocks 4, each support block 4 has only one vertical surface perpendicular to the mounting surface or connecting surface 5, and the two vertical surfaces abut each other to form a complete inverted frustum. The contraction and expansion of two or more support blocks 4 are the same as those of three support blocks 4.
[0039] Reference Figure 4 , Figure 5 In another embodiment of this application, the sliding device includes a sliding groove 7 and a slider 8. The sliding groove 7 is disposed on the top of the hydraulic rod 2 and on the support surface 6 of the previous expansion module connected to the expansion module. The slider 8 is integrally disposed with the support block 4 of the expansion module. The slider 8 is disposed on the connecting surface 5. The expansion module is slidably disposed through the cooperation of the sliding groove 7 and the slider 8. The sliding of the slider 8 in the sliding groove 7 also restricts the support block 4 to the hydraulic rod 2, preventing the support block 4 from separating from the hydraulic rod 2.
[0040] Additionally, when the support block 4 retracts, the mounting hole 3 created by the hydraulic rod 2 during retraction exerts a squeezing force on the support block 4. However, when the support block 4 unfolds, it needs to be pushed by the spring-loaded structure 9 to escape the squeezing force of the mounting hole 3. Therefore, the sliding device also includes a spring-loaded structure 9, which connects the hydraulic rod 2 and the extension module located on top of the hydraulic rod 2, as well as the extension module and another extension module superimposed on the extension module. Preferably, the spring-loaded structure 9 is a spring located between the slide groove 7 and the slider 8. One end of the spring can be connected to an inner edge of the slide groove 7, and the other end is located at the end of the slider 8. When the mounting hole 3 squeezes the support block 4, the slider 8 squeezes the spring. When the support block 4 disengages from the mounting hole 3, the slider 8 is pushed by the spring and unfolds in the slide groove 7.
[0041] The above description is merely a preferred embodiment of this utility model. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments without departing from the technical scope of this utility model and based on its technical essence shall still fall within the scope of this utility model.
Claims
1. A scalable split hydraulic jack with a top ram, characterized by: The device includes a hydraulic cylinder and a hydraulic rod that is telescopically mounted via the hydraulic cylinder. Both the hydraulic cylinder and the hydraulic rod are mounted in a mounting hole for mounting the hydraulic cylinder. The hydraulic rod is also provided with an extension mechanism that can be telescopically mounted on the hydraulic rod through the mounting hole. The extension mechanism is used to increase the support area of the hydraulic rod.
2. The expandable jack with a detachable hydraulic jack according to claim 1, characterized in that: The expansion mechanism consists of several separable expansion modules that are slidably connected at the top of the hydraulic rod via a sliding device. The expansion modules are stacked sequentially and then slidably connected via the sliding device.
3. A detachable hydraulic jack with an expandable jacking rod according to claim 2, characterized in that: The expansion module includes at least two support blocks with corresponding fan-shaped connecting surfaces and support surfaces, wherein the support surface is larger than the connecting surface. The arc-shaped connecting surface and the support surface are connected by an arc-shaped inclined surface, and the sliding device is set through the connecting surface.
4. A detachable hydraulic jack with an expandable jacking rod according to claim 3, characterized in that: The straight line segment between the fan-shaped connecting surface and the supporting surface of the expansion module is connected by a surface perpendicular to it.
5. A detachable hydraulic jack with an expandable jacking rod according to claim 3, characterized in that: The radius of the arc segment of the connecting surface is smaller than the radius of the hydraulic rod, and the radius of the supporting surface is smaller than or equal to the radius of the hydraulic rod.
6. A detachable hydraulic jack with an expandable jacking rod according to claim 3, characterized in that: The expansion blocks in each expansion module are arranged in a frustum shape after being shrunk.
7. A detachable hydraulic jack with an expandable jacking rod according to claim 3, characterized in that: The sliding device includes a groove and a slider. The groove is disposed on the top of the hydraulic rod and on the support surface of the previous expansion module connected to the expansion module. The slider is disposed on the connecting surface. The expansion module is slidably configured through the cooperation of the groove and the slider.
8. A detachable hydraulic jack with an expandable jacking rod according to claim 7, characterized in that: The sliding device also includes a spring-loaded structure, which is used to connect the hydraulic rod and the extension module disposed on the top of the hydraulic rod, as well as the extension module and another extension module superimposed on the extension module.
9. A detachable hydraulic jack with an expandable jacking rod according to claim 8, characterized in that: The rebound structure is a spring disposed between the slide and the slider.