A mechanical synchronization following protection of jacking jack self-locking device

Abstract

The present application relates to the technical fields of building jacking construction, especially to a jacking jack self-locking device with mechanical synchronous following protection, comprising a jack, a saddle connecting flange, a top cover, a supporting cylinder and a gear supporting cylinder, the saddle connecting flange is connected with the jack and the top cover through screws, the bottom end of the supporting cylinder is fixed with a top cover connecting plate, the outer side of the supporting cylinder is screw assembled with a connecting nut, the upper end of the connecting nut is fixedly connected with the gear supporting cylinder, and the inner side wall of the supporting cylinder is fixedly installed with a hydraulic motor. The present application realizes active controllable adjustment of the supporting process through the threaded engagement transmission between the gear supporting cylinder and the fixed supporting cylinder, solves the unavoidable supporting gap problem in the follow-up mode, can timely lock the supporting position through the threaded engagement structure locked in advance under the failure working conditions such as internal leakage and pressure relief of the jack, avoids the safety risk caused by supporting settlement, and realizes the instant mechanical protection after the failure of the jack.

Description

Technical Field

[0001] This invention relates to the field of building (structure) jacking construction technology, and in particular to a jacking jack self-locking device with mechanical synchronous following protection. Background Technology

[0002] Building jacking is a core technology in structural elevation adjustment, support replacement, defect repair, and existing structural reinforcement and renovation projects. It is a key means to ensure the operational safety of buildings and structures and restore their structural performance. In the current context of urban renewal and infrastructure upgrading, the demand for overall raising of existing buildings and structures, adjustment of longitudinal and transverse slopes, and improvement of access clearance continues to grow. Jacking technology has become an important engineering approach for achieving functional upgrades and spatial restructuring of existing structures.

[0003] In recent years, buildings and structures have been developing towards larger spans and heavier tonnages. Coupled with the continuously increasing demands for construction precision and safety standards in the engineering field, jacking construction places higher requirements on the synchronous control precision of hydraulic systems, the continuity of structural stress, and the system's safety redundancy. Especially in scenarios involving the overall raising and slope adjustment of buildings and structures, the structural stress state is more complex, and the requirements for multi-point coordinated control and differentiated jacking capabilities are more stringent. If the control precision is not up to standard, it can easily lead to engineering risks such as excessive additional internal forces in the structure, local instability, or even irreversible structural damage.

[0004] Currently, traditional jacking processes mostly employ alternating group jacking or a "active jacking + mechanical follow-up" control mode. In practical engineering applications, these methods generally suffer from three common problems: First, the support system exhibits discontinuous stress during the jacking process, resulting in insufficient structural stability. Second, the lack of mechanical follow-up devices easily leads to support gaps, insufficient clamping, and jack malfunctions, potentially causing "virtual support" safety hazards. Third, the switching control logic for multiple jacking units is complex, making it difficult to maintain stable synchronization accuracy. Construction quality relies excessively on operator experience, significantly limiting the overall safety and controllability of the construction. Therefore, how to achieve continuous stress on the support structure during jacking construction, eliminate support gaps and virtual supports, avoid safety risks caused by support settlement in the event of jack failure such as internal leakage or pressure relief, and provide immediate mechanical protection after jack failure are urgent technical problems to be solved in this field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that in the existing construction of building (structure) jacking, the lack of mechanical follow-up devices easily leads to failure conditions such as support gaps, insufficient clamping, and internal leakage and depressurization of jacks, resulting in safety hazards; at the same time, the support system has the defect of discontinuous stress in stages during the jacking process, which affects the structural stress stability.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: a self-locking device for a lifting jack with mechanical synchronous following protection, comprising a jack and a saddle connecting flange for mounting the jack. The saddle connecting flange is fixedly connected to the jack by a first screw, and fixedly connected to a top cover by a second screw. A support cylinder is provided below the top cover, and a top cover connecting plate is fixed to the bottom end of the support cylinder. A gear transmission assembly is provided between the top cover and the support cylinder. A connecting nut is threaded on the outer side of the support cylinder, and a gear support cylinder is fixedly connected to the upper end of the connecting nut. A hydraulic motor is fixedly installed on the inner wall of the support cylinder, and the output shaft of the hydraulic motor is connected to the inner wall of the gear support cylinder through the gear transmission assembly. During lifting, the jack extends and lifts, and at the same time, the hydraulic motor drives the gear transmission assembly to rotate the gear teeth on the inner wall of the gear support cylinder. The gear support cylinder moves axially through the threaded engagement of the connecting nut and the support cylinder, so that the gear support cylinder extends synchronously with the lifting action of the jack, realizing the active and controllable transmission of the supporting force.

[0007] Furthermore, the gear transmission assembly includes an intermediate gear fixedly connected to the output shaft of the hydraulic motor, a driven gear meshing with the intermediate gear, and a transmission gear meshing with the driven gear. The transmission gear meshes with the inner wall of the gear support cylinder.

[0008] Furthermore, driven gears and transmission gears are provided on both sides of the intermediate gear, and the gear transmission assembly is arranged in a straight line from left to right.

[0009] Furthermore, the hydraulic motor is connected to an outwardly extending oil inlet pipe and an oil outlet pipe.

[0010] Furthermore, the teeth of the transmission gear are vertical, the inner wall of the gear support cylinder has vertical teeth that match the transmission gear, the inner teeth of the connecting nut are horizontal, and the outer wall of the support cylinder has an external thread that matches the inner teeth of the connecting nut.

[0011] Furthermore, the outer wall of the gear support cylinder is provided with eye bolts, which are used for manual operation when hoisting the gear support cylinder and the gear chuck.

[0012] Furthermore, when the jack extends the cylinder, the speed at which the gear support cylinder moves upward due to the rotational speed of the hydraulic motor is greater than the speed at which the jack extends the cylinder, ensuring that the jack and the gear support cylinder remain in close contact at all times.

[0013] Furthermore, when the jack retracts its cylinder, the downward movement speed of the gear support cylinder caused by the rotation speed of the hydraulic motor is greater than the speed at which the jack retracts its cylinder, ensuring that the jack and the gear support cylinder are separated and will not jam.

[0014] The beneficial effects of this invention are as follows: This invention achieves active and controllable adjustment of the support process through the threaded meshing transmission between the gear support cylinder and the fixed support cylinder, solving the unavoidable support gap problem in the follow-up mode. In the event of jack failure such as internal leakage or pressure relief, the pre-locked threaded meshing structure can promptly lock the support position, avoiding safety risks caused by support settlement and providing immediate mechanical protection after jack failure. The hydraulic motor drives the gear transmission group to rotate the inner wall teeth of the gear support cylinder. The gear support cylinder, through the threaded engagement of the connecting nut and the support cylinder, converts the rotational motion into axial movement, allowing the gear support cylinder to extend synchronously with the jack's lifting action. This achieves smooth transfer and controlled unloading of the support force, ensuring continuous force on the support system and avoiding the additional internal forces and structural damage caused by discontinuous force in traditional lifting processes. The linear arrangement of the gear transmission group simplifies the number of gears and the overall structural dimensions while ensuring stable transmission. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of the present invention in the state of follow-up lifting.

[0019] Figure 4 This is a schematic diagram of the structure of a medium gear transmission assembly.

[0020] Figure 5 This is a schematic diagram of the internal structure of the connecting end of the connecting nut and the gear support cylinder in this invention.

[0021] Figure 6 This is a schematic diagram of the initial installation state of the present invention.

[0022] Figure 7 This is a schematic diagram of the structure after the connecting nut and gear support cylinder of the present invention are installed and raised close to each other.

[0023] Figure 8 This is a schematic diagram of the structure of the present invention in the follow-up lifting state.

[0024] Figure 9 This is a schematic diagram of the structure of the present invention in the state of dynamic contraction.

[0025] Figure 10 This is a schematic diagram of the structure of the present invention after the base is added.

[0026] Explanation of reference numerals in the attached drawings: 1. Saddle connecting flange; 2. First screw; 3. Second screw; 4. Top cover; 5. Top cover connecting plate; 6. Support cylinder; 7. Gear transmission assembly; 8. Connecting nut; 9. Gear support cylinder; 10. Hydraulic motor; 11. Intermediate gear; 12. Driven gear; 13. Transmission gear; 14. Oil inlet pipe; 15. Oil outlet pipe; 16. Eye bolt. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0028] like Figures 1-10 As shown, the present invention discloses a self-locking device for a lifting jack with mechanical synchronous following protection, comprising a jack and a saddle connecting flange 1 for mounting the jack. The saddle connecting flange 1, acting as a load-bearing conversion component, is fixedly connected to the bottom of the jack by a first screw 2, and simultaneously fixedly connected to the upper end face of a top cover 4 by a second screw 3. The top cover 4 has a disc-shaped structure, with a support cylinder 6 positioned below it. The support cylinder 6 is a cylindrical structure and serves as the core load-bearing component of the entire self-locking device, with external threads on its outer wall. A top cover connecting plate 5 is fixed to the bottom end of the support cylinder 6. A gear transmission assembly 7 is provided between the top cover 4 and the support cylinder 6.

[0029] A connecting nut 8 is threaded onto the outer side of the support cylinder 6, and a gear support cylinder 9 is fixedly connected to the upper end of the connecting nut 8. The internal teeth of the connecting nut 8 are of the cross-cut type, which matches the external threads on the outer wall of the support cylinder 6 to achieve thread engagement. The gear support cylinder 9 is coaxially sleeved on the outside of the support cylinder 6, and the inner wall of the gear support cylinder 9 is provided with internal teeth extending axially, which mesh with the transmission gear 13 of the gear transmission assembly 7.

[0030] A hydraulic motor 10 is fixedly mounted on the inner wall of the support cylinder 6. The hydraulic motor 10 is connected to an oil inlet pipe 14 and an oil outlet pipe 15, which are used to control the forward and reverse rotation and speed of the hydraulic motor 10. The output shaft of the hydraulic motor 10 is connected to a gear transmission group 7. The gear transmission group 7 is arranged in a straight line from left to right, including an intermediate gear 11 fixedly connected to the output shaft of the hydraulic motor 10, driven gears 12 and transmission gears 13 arranged on both sides of the intermediate gear 11. The intermediate gear 11 meshes with the driven gears 12 on both sides, the driven gears 12 mesh with the transmission gears 13, and the transmission gears 13 mesh with the teeth of the inner wall of the gear support cylinder 9 for transmission. There are two sets of driven gears 12 and transmission gears 13, which are symmetrically arranged on both sides of the intermediate gear 11, forming a "central drive, two-sided transmission" structural layout.

[0031] The gear support cylinder 9 is equipped with eye bolts 16 on its outer wall for hoisting the gear support cylinder 9 during installation, disassembly, or maintenance. When the gear transmission assembly 7 or the hydraulic motor 10 malfunctions and causes the gears to jam, the operator can also manually operate the equipment by rotating the eye bolts 16 to provide an emergency operation method.

[0032] During the lifting operation, the piston rod of the jack extends, driving the entire self-locking device to lift the building structure upwards. Simultaneously with the jack extension cylinder lifting, hydraulic oil controls the rotation of the hydraulic motor 10 through the inlet pipe 14 and outlet pipe 15. The output shaft of the hydraulic motor 10 drives the intermediate gear 11 to rotate, which in turn drives the driven gears 12 on both sides to rotate synchronously. The driven gears 12 drive the transmission gear 13 to rotate, and the transmission gear 13, through meshing with the teeth on the inner wall of the gear support cylinder 9, drives the gear support cylinder 9 to rotate circumferentially around the support cylinder 6. The rotational motion of the gear support cylinder 9 is converted into axial lifting and lowering movement of the gear support cylinder 9 through the meshing of the connecting nut 8 with the external thread of the support cylinder 6. When the jack extension cylinder lifts, the hydraulic motor 10 drives the gear support cylinder 9 to rotate synchronously and extend upwards. The lower end face of the gear support cylinder 9 always remains in contact with the foundation or pad, providing continuous and stable support force for the lifting structure.

[0033] The jack is welded to the building's underside via a pre-embedded plate. During cylinder retraction, the support cylinder 6 is lifted, and a support pad is installed in the space below. The jack is connected to the support cylinder 6 as a single unit via the first screw 2, ensuring the connection remains intact during cylinder retraction. The hydraulic motor 10 rotates in the reverse direction, causing the gear support cylinder 9 to rotate in the reverse direction, thus reducing the gap between the jack cylinder body and the saddle flange 1. Through the engagement of the connecting nut 8 with the external thread of the support cylinder 6, the gear support cylinder 9 moves axially downwards.

[0034] This invention achieves active and controllable adjustment of the support process through the threaded engagement between the gear support cylinder 9 and the support cylinder 6, possessing self-locking capability in both the lifting and lowering directions: when the gear support cylinder 9 is subjected to pressure from above, the cross-knotted teeth of the connecting nut 8 tightly engage with the external thread of the support cylinder 6, and the self-locking characteristic of the thread prevents the gear support cylinder 9 from rotating or slipping under external force, thus achieving stable support for the lifting load. The symmetrically distributed gear transmission sets 7 arranged in a straight line on both sides ensure that the driving force is evenly transmitted to both sides of the gear support cylinder 9, reducing off-center load and improving transmission smoothness.

[0035] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A self-locking device for a lifting jack with mechanical synchronous following protection, comprising a jack and a saddle connecting flange (1) for installing the jack, characterized in that: The saddle connecting flange (1) is fixedly connected to the jack by the first screw (2), and the saddle connecting flange (1) is fixedly connected to the top cover (4) by the second screw (3); a support cylinder (6) is provided below the top cover (4), and a top cover connecting plate (5) is fixed at the bottom of the support cylinder (6). A gear transmission group (7) is provided between the top cover (4) and the support cylinder (6). A connecting nut (8) is threaded on the outside of the support cylinder (6), and a gear support cylinder (9) is fixedly connected to the upper end of the connecting nut (8). A hydraulic motor (10) is fixedly installed on the inner wall of the support cylinder (6), and the output shaft of the hydraulic motor (10) is connected to the inner wall of the gear support cylinder (9) through the gear transmission group (7).

2. The self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 1, characterized in that: The gear transmission assembly (7) includes an intermediate gear (11) fixedly connected to the output shaft of the hydraulic motor (10), a driven gear (12) meshing with the intermediate gear (11) and a transmission gear (13) meshing with the driven gear (12). The transmission gear (13) meshes with the inner wall of the gear support cylinder (9).

3. A self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 2, characterized in that: Both sides of the intermediate gear (11) are provided with driven gears (12) and transmission gears (13), and the gear transmission group (7) is arranged in a straight line from left to right.

4. A self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 1, characterized in that: The hydraulic motor (10) is connected to an outwardly extending oil inlet pipe (14) and an oil outlet pipe (15).

5. A self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 1, characterized in that: The tooth pattern of the transmission gear (13) is vertical, the inner wall of the gear support cylinder (9) is provided with vertical patterns that match the transmission gear (13), the inner teeth of the connecting nut (8) are horizontal, and the outer wall of the support cylinder (6) is provided with an external thread that matches the inner teeth of the connecting nut (8).

6. A self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 1, characterized in that: The gear support cylinder (9) is provided with a lifting eye screw (16) on its outer wall. The lifting eye screw (16) is used for manual operation when hoisting the gear support cylinder (9) and the gear chuck.

7. A self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 1, characterized in that: When the jack extends the cylinder, the speed at which the gear support cylinder (9) moves upward due to the rotation speed of the hydraulic motor (10) is greater than the speed at which the jack extends the cylinder, ensuring that the jack and the gear support cylinder (9) remain in close contact at all times.

8. A self-locking device for a lifting jack with mechanical synchronous following protection as described in claim 1, characterized in that: When the jack retracts, the speed at which the gear support cylinder (9) moves downward due to the rotation speed of the hydraulic motor (10) is greater than the speed at which the jack retracts, ensuring that the jack and the gear support cylinder (9) are separated and will not be stuck.

Images