Automatic self-locking jack

Abstract

The invention relates to the technical field of jacks, in particular to an automatic self-locking jack which comprises a jack cylinder body, the lower portion of the jack cylinder body is fixedly sleeved with a sealing bearing mechanism used for stably installing the jack cylinder body, and a top cover is fixedly installed at the top of the jack cylinder body. The piston rod is effectively protected, the corrugated protection layer with the double-layer design is divided into a plurality of areas through the internal division layer, the situation that the whole leakage is caused by single-point damage of the protection layer is avoided, when the piston rod extends out, sealing between the top cover and the piston rod is achieved through pressing connection of the second sealing ring, and secondary sealing protection is achieved; through the arrangement of the sealing bearing mechanism, the whole jack cylinder body is limited and fixed through the fixed bearing assembly in the sealing bearing mechanism, and the situation that after the jack cylinder body is installed, concrete topples over is effectively avoided through the cooperation of the clamping assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of jacks, and in particular relates to an automatic self-locking jack. Background Art

[0002] A jack is a common manual or motorized tool, mainly used to lift heavy objects, such as vehicles such as cars. At the same time, due to its simple and convenient operation, the jack is also used in bridge inspection. Hydraulic jacks are a more common type of hydraulic jacks. Hydraulic jacks are divided into different types according to different usage scenarios. During the strength test of the bridge ring beam, the jack needs to be poured directly into the ring beam. After the ring beam is completely solidified, the output end of the jack is extended to test the bearing strength of the bridge ring beam. The existing jacks cast in concrete have the following problems when used: 1. Existing hydraulic jacks usually use the pressure of oil to push the piston upward and use the piston to lift the weight. However, after lifting the weight, it is usually necessary to manually rotate the locking cap and other related locking mechanisms to lock the piston to prevent the piston from falling back. However, the jacks used in the bridge ring beam structure strength test are directly cast in concrete and cannot be manually adjusted. Therefore, after long-term use, the jack's piston rod is prone to retreat, affecting the structural strength of the bridge.

[0003] 2. After the hydraulic jack lifts the weight, the piston extends from the inside of the cylinder. The piston is usually attached with lubricating oil. Therefore, after it extends, external dust, concrete debris and other impurities can easily enter the cylinder through the gap between the piston rod and the cylinder, causing wear on the piston surface and even a decrease in the sealing effect, shortening the service life of the jack.

[0004] 3. Since the jack is cast inside the concrete, during the pouring process, the impact and extrusion of the concrete can easily cause the jack to fall over, causing the direction of the extension test to change, affecting the test results. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic self-locking jack with a simple structure and reasonable design in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: An automatic self-locking jack comprises a jack cylinder, a sealing support mechanism is fixedly mounted on the lower part of the jack cylinder, a top cover is fixedly mounted on the top of the jack cylinder, and a piston cylinder is movably mounted inside the jack cylinder; A piston rod that is movable and passes through the center of the top cover is fixedly installed on the top of the piston cylinder. A fixed sleeve is threadedly connected to the top of the internal top of the jack cylinder body. An automatic locking mechanism for locking and fixing the piston rod is provided inside the fixed sleeve. The top of the piston rod is threadedly fixedly connected to a No. 1 support plate. A sealing and dustproof mechanism for protecting the piston rod is provided between the No. 1 support plate and the top cover.

[0007] Preferably, two sealing rings are symmetrically fixedly sleeved on the outside of the piston cylinder, the outsides of the two sealing rings fit into the inside of the jack cylinder body, and a number of No. 2 clamping teeth are evenly fixedly installed on the outside bottom of the piston rod.

[0008] Preferably, two oil inlet pipes are fixedly installed symmetrically on the bottom of the jack cylinder, and the oil inlet pipes are connected to the interior of the jack cylinder through a connecting hole.

[0009] Preferably, a No. 1 fixing ring is fixedly installed on the top of the connecting hole, a supporting ring is fixedly installed on the bottom of the connecting hole, two limiting grooves are symmetrically provided inside the connecting hole, a No. 1 spring is fixedly installed on the lower part of the No. 1 fixing ring, a movable snap ring is fixedly installed on the bottom of the No. 1 spring, two limiting blocks are symmetrically fixedly installed on the outside of the movable snap ring, the limiting blocks are slidably connected to the inside of the limiting groove, a snap-fitting steel ball is crimped and fixed on the bottom of the movable snap ring, and the snap-fitting steel ball is snap-fitted to the top of the supporting ring.

[0010] Preferably, the sealing and dustproof mechanism includes a No. 2 fixing ring fixedly sleeved on the top of the piston rod, an internal corrugated protective layer is fixedly installed between the No. 2 fixing ring and the top cover, an external corrugated protective layer is fixedly installed on the outside of the bottom of the No. 2 fixing ring, the bottom of the external corrugated protective layer is fixedly connected to the top of the top cover, and a number of internal partition layers are evenly fixedly installed between the external corrugated protective layer and the internal corrugated protective layer, and the internal partition layers divide the cavity enclosed between the internal corrugated protective layer and the external corrugated protective layer into a number of areas.

[0011] Preferably, the automatic locking mechanism includes a No. 2 sealing ring fixedly installed on the bottom of the top cover, the No. 2 sealing ring is slidably sleeved on the outside of the piston rod, the top of the No. 2 sealing ring fits with the bottom of the top cover, three arc-shaped clamping blocks are evenly sleeved on the outside of the piston rod, and a number of No. 1 clamping teeth are evenly fixedly installed inside the three arc-shaped clamping blocks, the No. 1 clamping teeth are clamped and fixed with the No. 2 clamping teeth, and two rubber rings are symmetrically and evenly sleeved on the outside of the three arc-shaped clamping blocks.

[0012] Preferably, the sealing support mechanism includes a clamping assembly, a fixed support assembly and a crimping assembly. The fixed support assembly is sleeved on the lower part of the jack cylinder, the crimping assembly is arranged at the lower part of the fixed support assembly, and the clamping assembly is symmetrically arranged on both sides of the fixed support assembly.

[0013] Preferably, the fixed support assembly includes two arc-shaped fixed plates movably sleeved on the lower part of the jack cylinder body, the two arc-shaped fixed plates are fixedly connected by screws and nuts, and a No. 1 L-shaped rod is fixedly installed on the outside of the two arc-shaped fixed plates, a No. 2 L-shaped rod is fixedly installed on the bottom of the No. 1 L-shaped rod, and a top sleeve is fixedly installed on the bottom of the No. 2 L-shaped rod, and a No. 2 supporting plate is fixedly connected to the bottom of the jack cylinder body, three fixing rods are evenly fixedly installed on the bottom of the No. 2 supporting plate, and a bottom plate is commonly fixedly installed on the bottom of the three fixing rods, and two bottom sleeves are symmetrically fixedly installed on the bottom of the No. 2 supporting plate, and the bottom sleeve and the top sleeve jointly seal and protect the oil inlet pipe, a crimping assembly is provided between the bottom sleeve and the top sleeve, and a U-shaped frame is fixedly installed on the arc-shaped fixed plate.

[0014] The second fixing plate is fixedly mounted on one end of the U-shaped frame, and the second fixing plate is fixedly mounted on the bottom of the side plate. The second fixing plate is fixedly mounted on the side of the first fixing plate close to the U-shaped frame. The first fixing plate is fixedly mounted on the second fixing arm. A guide rod is symmetrically inserted into the first mounting plate for sliding movement. The bottoms of the two guide rods are jointly slidably sleeved with the second mounting plate. Blocks are fixedly mounted on both ends of the two guide rods. A second spring is sleeved on the outside of the guide rod, and the second spring is arranged between the first mounting plate and the second mounting plate. The first fixing arm is fixedly mounted on the side of the second mounting plate away from the U-shaped frame, and the second fixing plate is fixedly mounted on one end of the first fixing arm. Rubber pressing plates are fixedly mounted on the side where the first and second fixing plates are close to each other.

[0015] Preferably, the crimping assembly includes a plug-in slot opened at the end of the bottom sleeve, one side of the plug-in slot is connected to the inside of the bottom sleeve, a plug-in block is slidably connected to the inside of the plug-in slot, the top of the plug-in block is fixedly connected to the bottom of the top sleeve, a crimping block is fixedly installed on the plug-in block, a No. 1 sealing ring is sleeved on the oil inlet pipe, and the crimping block crimps the No. 1 sealing ring to the step of the oil inlet pipe.

[0016] The beneficial effects of the present invention are: 1. The present invention adopts a double-layer telescopic design through the setting of a sealing and dustproof mechanism to effectively protect the piston rod. The double-layer corrugated protective layer is divided into multiple areas by an internal partition layer, avoiding the overall leakage caused by single-point damage of the protective layer, realizing primary sealing protection and improving the overall protection capability. A No. 2 sealing ring is installed on the top cover, and the No. 2 sealing ring is used to achieve sealing between the top cover and the piston rod, realizing secondary sealing protection.

[0017] 2. The present invention sets a sealing support mechanism and uses the fixed support assembly in the sealing support mechanism to limit and fix the entire jack cylinder body, and cooperates with the use of the clamping assembly to effectively avoid the jack cylinder body from tipping over on the concrete after installation. In addition, the coordinated use of the fixed support assembly and the crimping assembly realizes the protection of the oil inlet pipe and the sealing of the oil inlet pipe.

[0018] 3. The present invention adopts the setting of the automatic locking mechanism. When the piston rod is extended, the second engaging tooth on the outside of the piston rod is engaged and fixed with the No. 1 engaging tooth in the automatic locking mechanism, thereby realizing gradual extension and gradual engagement and fixation, effectively avoiding the problem of piston rod retraction. Moreover, through the setting of the engaging steel ball and the No. 1 spring, the oil can enter the jack cylinder from the oil inlet pipe in one direction, thereby avoiding the reverse leakage of oil from the oil inlet pipe and further preventing the piston rod from retracting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the overall structure of the present invention; Figure 3 It is a three-dimensional bottom view of the jack cylinder of the present invention; Figure 4 is a front cross-sectional view of the jack cylinder of the present invention; Figure 5 It is a partial structural cross-sectional view of the present invention; Figure 6 It is a partial cross-sectional view of the jack cylinder and the sealing and dustproof mechanism of the present invention; Figure 7 The present invention Figure 6 A magnified schematic diagram of area A in the middle; Figure 8 is a partial cross-sectional view of the automatic locking mechanism and piston rod of the present invention; Figure 9 is a three-dimensional diagram of the sealing support mechanism of the present invention; Figure 10 is a partial cross-sectional view of the sealing support mechanism of the present invention; Figure 11 The present invention Figure 10 A magnified schematic diagram of area B in the middle; Figure 12 It is an exploded view of the local structure of the sealing support mechanism of the present invention.

[0020] In the figure: 1. Jack cylinder; 2. Top cover; 3. Sealing dustproof mechanism; 31. Internal corrugated protective layer; 32. No. 2 fixing ring; 33. External corrugated protective layer; 34. Internal partition layer; 4. No. 1 supporting plate; 5. Sealing supporting mechanism; 51. Clamping assembly; 510. No. 1 fixed arm; 511. No. 1 fixed plate; 512. Rubber pressing plate; 513. No. 2 fixed plate; 514. Side plate; 515. No. 2 fixed arm; 516. No. 1 mounting plate; 517. Movable rod; 518. Guide rod; 519. No. 2 spring; 52. Fixed supporting assembly; 521. U-shaped frame; 522. No. 1 L-shaped rod; 523. Arc-shaped fixing plate; 52 4. Top sleeve; 525. Bottom sleeve; 526. Support plate No. 2; 527. Fixed rod; 528. Bottom plate; 529. L-shaped rod No. 2; 53. Crimping assembly; 531. Sealing ring No. 1; 532. Crimping block; 533. Plug-in block; 534. Plug-in slot; 6. Automatic locking mechanism; 61. Snap-fit tooth No. 1; 62. Rubber ring; 63. Arc-shaped clamping block; 64. Sealing ring No. 2; 7. Fixed sleeve; 8. Sealing ring; 9. Piston cylinder; 10. Piston rod; 11. Oil inlet pipe; 12. Snap-fit steel ball; 13. Fixed ring No. 1; 14. Spring No. 1; 15. Movable snap ring; 16. Support ring; 17. Connecting hole; 18. Limit block. DETAILED DESCRIPTION

[0021] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example: See Figure 1 、 Figure 2 and Figure 3An automatic self-locking jack includes a jack cylinder 1, a sealing support mechanism 5 for its stable installation is fixed on the lower part of the jack cylinder 1, a top cover 2 is fixed on the top of the jack cylinder 1, and a piston cylinder 9 is movably installed inside the jack cylinder 1; a piston rod 10 that movably passes through the top center of the top cover 2 is fixed on the top of the piston cylinder 9, a fixed sleeve 7 is threadedly connected to the top of the jack cylinder 1, and an automatic locking mechanism 6 is provided inside the fixed sleeve 7 for locking and fixing the piston rod 10. The fixed sleeve 7 is used to lock the automatic locking mechanism 6 for support and limitation, the top of the piston rod 10 is fixedly connected with the No. 1 supporting plate 4 by thread, and a sealing dustproof mechanism 3 for protecting the piston rod 10 is provided between the No. 1 supporting plate 4 and the top cover 2. Two sealing rings 8 are fixedly sleeved symmetrically on the outside of the piston cylinder 9, and the outsides of the two sealing rings 8 are fitted with the inside of the jack cylinder body 1. A number of No. 2 card teeth are evenly fixed on the bottom of the outside of the piston rod 10, and two oil inlet pipes 11 are fixedly installed symmetrically on the left and right sides of the bottom of the jack cylinder body 1. The oil inlet pipe 11 is connected to the inside of the jack cylinder body 1 through a connecting hole 17.

[0023] When in use, the sealing support mechanism 5 is used to fix and protect the jack cylinder body 1, the top cover 2 is used to achieve the sealing of the jack cylinder body 1, the sealing ring 8 on the piston cylinder 9 is used to achieve the sealing between the piston cylinder 9 and the inner wall of the jack cylinder body 1, the automatic locking mechanism 6 is used to gradually lock and fix the piston rod 10 to prevent the piston rod 10 from retreating, and the sealing dustproof mechanism 3 is used to achieve the sealing between the piston rod 10 and the top cover 2 to prevent concrete from entering the inside of the jack cylinder body 1.

[0024] See also Figure 2 、 Figure 4 and Figure 5 A No. 1 fixing ring 13 is fixedly installed on the top of the communicating hole 17, a supporting ring 16 is fixedly installed on the bottom of the communicating hole 17, two limiting slide grooves are symmetrically opened inside the communicating hole 17, a No. 1 spring 14 is fixedly installed on the lower part of the No. 1 fixing ring 13, a movable snap ring 15 is fixedly installed on the bottom of the No. 1 spring 14, and two limiting blocks 18 are symmetrically fixedly installed on the outside of the movable snap ring 15. The limiting blocks 18 are slidably connected to the inside of the limiting slide groove, and a snap-fitting steel ball 12 is press-fitted on the bottom of the movable snap ring 15. The snap-fitting steel ball 12 is snap-fitted to the top of the supporting ring 16, and the outer diameter of the movable snap ring 15 is smaller than the inner diameter of the communicating hole 17.

[0025] During use, the hydraulic oil enters the connecting hole 17 from the oil inlet pipe 11, and the clamping steel ball 12 is squeezed upward by the pressure of the oil, driving the clamping steel ball 12 to move upward, and synchronously driving the movable clamping ring 15 to move upward, and then synchronously compressing the No. 1 spring 14. At this time, the oil enters the connecting hole 17 from the gap between the clamping steel ball 12 and the supporting ring 16, and then enters the inside of the jack cylinder 1 from the gap between the movable clamping ring 15 and the connecting hole 17, realizing one-way transportation of the oil. After the oil enters the inside of the jack cylinder 1, under the elastic force of the No. 1 spring 14, the movable clamping ring 15 and the clamping steel ball 12 thereon are pressed downward, and the sealing between the clamping steel ball 12 and the supporting ring 16 is utilized. The supporting ring 16 is provided with an inclined groove that cooperates with the clamping steel ball 12 to avoid oil leakage.

[0026] See also Figure 2 、 Figure 6 and Figure 7 The sealing and dust-proof mechanism 3 includes a No. 2 fixing ring 32 fixedly sleeved on the outside of the top of the piston rod 10, an internal corrugated protective layer 31 is fixedly installed between the No. 2 fixing ring 32 and the top cover 2, an external corrugated protective layer 33 is fixedly installed on the outside of the bottom of the No. 2 fixing ring 32, the bottom of the external corrugated protective layer 33 is fixedly connected to the top of the top cover 2, and a number of internal partition layers 34 are evenly fixedly installed between the external corrugated protective layer 33 and the internal corrugated protective layer 31. The internal partition layers 34 divide the cavity enclosed by the internal corrugated protective layer 31 and the external corrugated protective layer 33 into several areas.

[0027] When in use, the outer corrugated protective layer 33 and the inner corrugated protective layer 31 achieve double-layer dust-proof protection for the piston rod 10 while ensuring expansion and contraction, preventing unsolidified concrete from entering the interior of the jack cylinder 1 through the gap between the piston rod 10 and the top cover 2, achieving a primary seal of the piston rod 10, and improving the dust-proof ability of the jack. The internal partition layer 34 divides the area composed of the outer corrugated protective layer 33 and the inner corrugated protective layer 31 into several areas, each area is independent of each other, avoiding the damage of the outer corrugated protective layer 33 in a single area affecting other areas.

[0028] See also Figure 2 、 Figure 4 、 Figure 8 The automatic locking mechanism 6 includes a No. 2 sealing ring 64 fixedly installed at the bottom of the top cover 2. The No. 2 sealing ring 64 is slidably sleeved on the outside of the piston rod 10. The top of the No. 2 sealing ring 64 fits with the bottom of the top cover 2. Three arc-shaped blocks 63 are evenly sleeved on the outside of the piston rod 10. Several No. 1 engaging teeth 61 are evenly fixed on the inside of the three arc-shaped blocks 63. The No. 1 engaging teeth 61 are fixedly engaged with the No. 2 engaging teeth. Two rubber rings 62 are evenly sleeved on the outside of the three arc-shaped blocks 63 in a symmetrical manner.

[0029] During use, after the hydraulic oil enters the interior of the jack cylinder 1 from the connecting hole 17, the piston cylinder 9 and the piston rod 10 thereon are driven by the hydraulic pressure to move upward, and at this time the No. 2 engaging tooth on the piston rod 10 is driven to move upward. When the No. 2 engaging tooth moves upward, it is engaged and fixed with the No. 1 engaging tooth 61, avoiding the piston rod 10 from retreating and collapsing, ensuring the stability of the pressure, and when the No. 2 engaging tooth on the upward piston rod 10 moves upward, the rubber ring 62 itself is elastic, which facilitates the upward squeezing of the No. 2 engaging tooth, avoiding the situation that the No. 2 engaging tooth cannot move upward. The setting of the No. 2 sealing ring 64 realizes direct pressure sealing between the piston rod 10 and the top cover 2, and the No. 2 sealing ring 64 also has the function of cleaning and scraping oil from the outer wall of the piston rod 10, effectively avoiding oil leakage and the occurrence of oil adhesion on the surface of the piston rod 10.

[0030] See also Figure 2 and Figure 9 The sealing support mechanism 5 includes a clamping assembly 51, a fixed support assembly 52 and a pressing assembly 53. The fixed support assembly 52 is sleeved on the lower part of the jack cylinder 1, and the pressing assembly 53 is arranged on the lower part of the fixed support assembly 52. The clamping assembly 51 is symmetrically arranged on both sides of the fixed support assembly 52. The fixed support assembly 52 includes two arc-shaped fixed plates 523 that are movably sleeved on the lower part of the jack cylinder 1. The two arc-shaped fixed plates 523 are fixedly connected by screws and nuts. The outside of the two arc-shaped fixed plates 523 is fixedly installed with a No. 1 L-shaped rod 522, and the bottom of the No. 1 L-shaped rod 522 is fixedly installed with a No. 2 L-shaped rod 5 29. A top sleeve 524 is fixedly installed at the bottom of the No. 2 L-shaped rod 529, and a No. 2 supporting plate 526 is welded and fixed to the bottom of the jack cylinder body 1. Three fixing rods 527 are evenly fixedly installed at the bottom of the No. 2 supporting plate 526, and a bottom plate 528 is fixedly installed together at the bottom of the three fixing rods 527. Two bottom sleeves 525 are fixedly installed symmetrically on the bottom of the No. 2 supporting plate 526. The bottom sleeve 525 and the top sleeve 524 jointly seal and protect the oil inlet pipe 11. A crimping assembly 53 is provided between the bottom sleeve 525 and the top sleeve 524, and a U-shaped frame 521 is fixedly installed on the arc-shaped fixing plate 523.

[0031] See also Figure 2 、 Figure 9 and Figure 10The clamping assembly 51 includes a movable rod 517 that slides through the middle of the U-shaped frame 521. The end of the movable rod 517 away from the U-shaped frame 521 is fixedly installed with a side plate 514. The bottom of the side plate 514 is fixedly installed with a No. 1 fixed plate 511. The side of the No. 1 fixed plate 511 close to the U-shaped frame 521 is fixedly installed with a No. 2 fixed arm 515. The No. 1 mounting plate 516 is fixedly installed on the No. 2 fixed arm 515. A guide rod 518 slides symmetrically through the No. 1 mounting plate 516. The bottom of the two guide rods 518 A No. 2 mounting plate is slidably sleeved together, and blocks are fixedly installed at both ends of the two guide rods 518. A No. 2 spring 519 is sleeved on the outside of the guide rod 518. The No. 2 spring 519 is arranged between the No. 1 mounting plate 516 and the No. 2 mounting plate. A No. 1 fixing arm 510 is fixedly installed on the side of the No. 2 mounting plate away from the U-shaped frame 521, and a No. 2 fixing plate 513 is fixedly installed on one end of the No. 1 fixing arm 510. A rubber pressing plate 512 is fixedly installed on the side where the No. 1 fixing plate 511 and the No. 2 fixing plate 513 are close to each other.

[0032] See also Figure 9 、 Figure 10 、 Figure 11 and Figure 12 The crimping assembly 53 includes a plug-in slot 534 opened at the end of the bottom sleeve 525, one side of the plug-in slot 534 is communicated with the interior of the bottom sleeve 525, a plug-in block 533 is slidably connected inside the plug-in slot 534, the top of the plug-in block 533 is fixedly connected to the bottom of the top sleeve 524, a crimping block 532 is fixedly installed on the plug-in block 533, a No. 1 sealing ring 531 is sleeved on the oil inlet pipe 11, and the crimping block 532 crimps the No. 1 sealing ring 531 to the step of the oil inlet pipe 11.

[0033] When in use, first sleeve the No. 1 sealing ring 531 onto the oil inlet pipe 11, and then weld the No. 2 supporting plate 526 to the bottom center of the jack cylinder body 1. When welding, ensure that the top of the bottom sleeve 525 fits the bottom of the oil inlet pipe 11, and ensure that the No. 1 sealing ring 531 is placed inside the mounting groove on the bottom sleeve 525, thereby realizing protection of the bottom of the oil inlet pipe 11. After the welding is completed, sleeve the arc-shaped fixing plate 523 onto the outside of the jack cylinder body 1. When sleeved, ensure that the plug-in block 533 is directly inserted into the plug-in groove 534, and use the crimping block 532 on the plug-in block 533 to press the No. The sealing ring 531 is crimped and fixed, and the No. 1 sealing ring 531 is crimped onto the stepped chamfer on the oil inlet pipe 11, thereby protecting the external gap of the oil inlet pipe 11 and preventing concrete from entering the integral interior composed of the bottom sleeve 525 and the top sleeve 524. The bottom sleeve 525 and the top sleeve 524 not only protect the oil inlet pipe 11 and avoid squeezing and damage, but also realize the sealing of the outside of the oil inlet pipe 11 and prevent concrete from entering between the bottom sleeve 525 and the top sleeve 524 and the oil inlet pipe 11, thereby extending the service life of the oil inlet pipe 11. After the fixed plate 523 is sleeved, it is tightened and fixed with screws and nuts. Then, the jack cylinder 1 and the sealing support mechanism 5 are put into the steel cage of the bridge ring beam or other position where support needs to be tested. At this time, the movable rod 517 is pulled to drive the side plate 514 and the No. 1 fixed plate 511 thereon to move, indirectly driving the No. 2 fixed plate 513 and the rubber pressing plate 512 to move until the rubber pressing plate 512 moves to the appropriate position, and synchronously presses the No. 1 mounting plate 516 and the No. 2 mounting plate along the axial direction of the guide rod 518, synchronously compresses the No. 2 spring 519, and drives the No. 2 fixed arm 515 and the No. 1 fixed arm. The fixed arm 510 moves away from each other, synchronously driving the No. 2 fixing plate 513 and the No. 1 fixing plate 511 to move away from each other, placing the No. 2 fixing plate 513 and the No. 1 fixing plate 511 on the side steel bars of the steel cage, loosening the No. 1 mounting plate 516 and the No. 2 mounting plate, and under the elastic force of the No. 2 spring 519, the steel cage is clamped and fixed by the rubber compression plate 512, and the bottom support of the fixing rod 527 and the bottom plate 528 is cooperated to ensure the stable installation of the jack cylinder body 1, avoid the jack cylinder body 1 from tipping over during concrete pouring, and ensure the installation stability of the jack cylinder body 1.

[0034] It should be noted that when using this automatic self-locking jack, first sleeve the No. 1 sealing ring 531 onto the oil inlet pipe 11, and then weld the No. 2 supporting plate 526 to the bottom center of the jack cylinder 1. When welding, ensure that the top of the bottom sleeve 525 fits the bottom of the oil inlet pipe 11 to achieve protection of the bottom of the oil inlet pipe 11. After the welding is completed, sleeve the arc-shaped fixing plate 523 onto the outside of the jack cylinder 1. When sleeved, ensure that the plug-in block 533 is directly inserted into the plug-in groove 534, and use the crimping block 532 on the plug-in block 533 to press the No. 1 sealing ring 531. The first sealing ring 531 is crimped and fixed onto the stepped chamfer on the oil inlet pipe 11, thereby protecting the external gap of the oil inlet pipe 11. The clamping assembly 51 is then used to clamp the steel bars on the side of the steel cage, and the bottom support of the fixing rod 527 and the bottom plate 528 is coordinated to ensure the stable installation of the jack cylinder 1, and at the same time, the protection and sealing of the oil inlet pipe 11 are achieved. After the installation is stable, the oil pump and the oil inlet pipe 11 are connected, and the two oil inlet pipes 11 are used to simultaneously feed oil, which improves the oil feeding efficiency. The concrete is then poured. After the pouring is completed and solidified and when testing is required, the oil is started. When the hydraulic oil in the oil pump enters the jack cylinder 1 through the connecting hole 17, and the seal between the clamping steel ball 12 and the supporting ring 16 is used to avoid oil leakage, thereby ensuring the stability of the oil pressure inside the jack cylinder 1. After the oil enters the jack cylinder 1, it drives the piston cylinder 9 and the piston rod 10 thereon to move upward, and simultaneously drives the No. 1 supporting plate 4 to move upward. The No. 1 supporting plate 4 is used to squeeze the concrete, thereby realizing the test of the strength and bearing capacity of the bridge concrete. Since the volume inside the jack cylinder 1 is fixed, the pressurized pressure can be measured according to the amount of oil injected. When the pressure is applied to the specified pressure, the bridge is still intact without cracks, which means that the surface bridge structure strength and pressure bearing capacity meet the standards, and when the piston rod 10 moves upward step by step, it drives the second engaging tooth and the first engaging tooth 61 to be engaged and fixed step by step, avoiding the piston rod 10 from retreating and shrinking, ensuring the stability of the pressure, and achieving the simultaneous support of the bridge during the strength test, and the sealing dustproof mechanism 3 realizes the double-layer dustproof protection of the piston rod 10, avoiding the unsolidified concrete from entering the interior of the jack cylinder 1 through the gap between the piston rod 10 and the top cover 2, thereby extending the service life of the equipment.

[0035] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. An automatic self-locking jack, comprising a jack cylinder (1), characterized in that: The lower part of the jack cylinder (1) is sleeved with a sealing support mechanism (5), the top of the jack cylinder (1) is fixedly mounted with a top cover (2), and the interior of the jack cylinder (1) is movably mounted with a piston cylinder (9); A piston rod (10) is fixedly installed on the top of the piston cylinder (9) and is movable and passes through the top center of the top cover (2). A fixed sleeve (7) is threadedly connected to the top of the jack cylinder body (1). An automatic locking mechanism (6) for locking and fixing the piston rod (10) is provided inside the fixed sleeve (7). The top of the piston rod (10) is threadedly fixedly connected to a No. 1 support plate (4). A sealing dustproof mechanism (3) for protecting the piston rod (10) is provided between the No. 1 support plate (4) and the top cover (2).

2. The automatic self-locking jack according to claim 1, characterized in that: The outer portion of the piston cylinder (9) is symmetrically and fixedly sleeved with two sealing rings (8), the outer portions of the two sealing rings (8) are fitted with the inner portion of the jack cylinder body (1), and the outer bottom portion of the piston rod (10) is evenly and fixedly mounted with a plurality of No. 2 snap-fit teeth.

3. The automatic self-locking jack according to claim 1, characterized in that: Two oil inlet pipes (11) are fixedly mounted symmetrically on the bottom of the jack cylinder (1), and the oil inlet pipes (11) are connected to the interior of the jack cylinder (1) via a connecting hole (17).

4. The automatic self-locking jack according to claim 3, characterized in that: A No. 1 fixing ring (13) is fixedly installed on the top of the connecting hole (17), a supporting ring (16) is fixedly installed on the bottom of the connecting hole (17), two limiting sliding grooves are symmetrically opened inside the connecting hole (17), a No. 1 spring (14) is fixedly installed on the lower part of the No. 1 fixing ring (13), a movable snap ring (15) is fixedly installed on the bottom of the No. 1 spring (14), two limiting blocks (18) are symmetrically fixedly installed on the outside of the movable snap ring (15), the limiting blocks (18) are slidably connected to the inside of the limiting sliding groove, a clamping steel ball (12) is press-fitted and fixed on the bottom of the movable snap ring (15), and the clamping steel ball (12) is clamped and fitted on the top of the supporting ring (16).

5. The automatic self-locking jack according to claim 1, characterized in that: The sealing dustproof mechanism (3) comprises a No. 2 fixing ring (32) fixedly sleeved on the top of the piston rod (10), an internal corrugated protective layer (31) fixedly installed between the No. 2 fixing ring (32) and the top cover (2), an external corrugated protective layer (33) fixedly installed on the outside of the bottom of the No. 2 fixing ring (32), the bottom of the external corrugated protective layer (33) is fixedly connected to the top of the top cover (2), and a plurality of internal partitioning layers (34) are evenly fixedly installed between the external corrugated protective layer (33) and the internal corrugated protective layer (31), and the internal partitioning layers (34) divide the cavity enclosed between the internal corrugated protective layer (31) and the external corrugated protective layer (33) into a plurality of areas.

6. The automatic self-locking jack according to claim 2, characterized in that: The automatic locking mechanism (6) includes a No. 2 sealing ring (64) fixedly mounted on the bottom of the top cover (2), the No. 2 sealing ring (64) is slidably sleeved on the outside of the piston rod (10), the top of the No. 2 sealing ring (64) is in contact with the bottom of the top cover (2), three arc-shaped clamping blocks (63) are evenly sleeved on the outside of the piston rod (10), a plurality of No. 1 clamping teeth (61) are evenly fixedly mounted inside the three arc-shaped clamping blocks (63), the No. 1 clamping teeth (61) are clamped and fixed with the No. 2 clamping teeth, and two rubber rings (62) are evenly sleeved on the outside of the three arc-shaped clamping blocks (63) in an upper and lower symmetrical manner.

7. The automatic self-locking jack according to claim 1, characterized in that: The sealing support mechanism (5) comprises a clamping assembly (51), a fixed support assembly (52) and a pressing assembly (53); the fixed support assembly (52) is sleeved on the lower part of the jack cylinder (1); the pressing assembly (53) is arranged on the lower part of the fixed support assembly (52); and the clamping assembly (51) is symmetrically arranged on both sides of the fixed support assembly (52).

8. The automatic self-locking jack according to claim 7, characterized in that: The fixed support assembly (52) comprises two arc-shaped fixed plates (523) movably sleeved on the lower part of the jack cylinder (1), the two arc-shaped fixed plates (523) are fixedly connected by screws and nuts, the outer parts of the two arc-shaped fixed plates (523) are fixedly mounted with a No. 1 L-shaped rod (522), the bottom of the No. 1 L-shaped rod (522) is fixedly mounted with a No. 2 L-shaped rod (529), the bottom of the No. 2 L-shaped rod (529) is fixedly mounted with a top sleeve (524), the bottom of the jack cylinder (1) is fixedly connected with a No. 2 support plate (526), and the No. 2 L-shaped rod (529) is fixedly mounted with a top sleeve (524). Three fixing rods (527) are evenly fixedly installed on the bottom of the No. 1 support plate (526), and a bottom plate (528) is fixedly installed on the bottom of the three fixing rods (527). Two bottom sleeves (525) are fixedly installed symmetrically on the bottom of the No. 2 support plate (526). The bottom sleeves (525) and the top sleeves (524) jointly seal and protect the oil inlet pipe (11). A pressing assembly (53) is provided between the bottom sleeves (525) and the top sleeves (524). A U-shaped frame (521) is fixedly installed on the arc-shaped fixing plate (523).

9. The automatic self-locking jack according to claim 8, characterized in that: The clamping assembly (51) includes a movable rod (517) that slides through the middle of the U-shaped frame (521), a side plate (514) is fixedly installed on one end of the movable rod (517) away from the U-shaped frame (521), a No. 1 fixed plate (511) is fixedly installed on the bottom of the side plate (514), a No. 2 fixed arm (515) is fixedly installed on the side of the No. 1 fixed plate (511) close to the U-shaped frame (521), a No. 1 mounting plate (516) is fixedly installed on the No. 2 fixed arm (515), a guide rod (518) is symmetrically slid through the No. 1 mounting plate (516), and the two guide rods (518) are fixedly installed on the No. 1 mounting plate (516). 8) The bottom is slidably sleeved with a No. 2 mounting plate, and both ends of the two guide rods (518) are fixedly mounted with a stopper, and the outer sleeve of the guide rod (518) is provided with a No. 2 spring (519), and the No. 2 spring (519) is arranged between the No. 1 mounting plate (516) and the No. 2 mounting plate, and the No. 2 mounting plate is fixedly mounted with a No. 1 fixed arm (510) on the side away from the U-shaped frame (521), and the No. 2 fixing plate (513) is fixedly mounted on one end of the No. 1 fixing arm (510), and the No. 1 fixing plate (511) and the No. 2 fixing plate (513) are fixedly mounted with a rubber pressing plate (512) on the side close to each other.

10. The automatic self-locking jack according to claim 8, characterized in that: The crimping assembly (53) includes a plug-in slot (534) opened at the end of the bottom sleeve (525), one side of the plug-in slot (534) is communicated with the interior of the bottom sleeve (525), a plug-in block (533) is slidably connected inside the plug-in slot (534), the top of the plug-in block (533) is fixedly connected to the bottom of the top sleeve (524), a crimping block (532) is fixedly mounted on the plug-in block (533), a No. 1 sealing ring (531) is sleeved on the oil inlet pipe (11), and the crimping block (532) crimps the No. 1 sealing ring (531) to the step of the oil inlet pipe (11).

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