Internal oil path middle cylinder applied to hydraulic lock anchor tensioning jack

Abstract

The invention relates to an inner oil path middle cylinder applied to a hydraulic lock anchor tensioning jack, and belongs to the technical field of tensioning jacks, the inner oil path middle cylinder comprises an outer cylinder, a middle cylinder and an inner cylinder, one end of the outer cylinder is provided with a sealing cover, one end of the outer cylinder is provided with an insertion groove along the circumferential inner wall, and the insertion groove penetrates through one end of the outer cylinder and is communicated end to end; clamping grooves are formed in the positions, on the side wall of the inserting groove, of the outer cylinder and the outer wall of the end, close to the inserting groove, of the inner cylinder, a moving groove is formed in the side wall of the sealing cover in a penetrating mode, two clamping rods are slidably connected to the position, in the moving groove, of the sealing cover, the clamping rods and the clamping grooves are matched in a clamped mode and correspond to each other in a one-to-one mode, and a cavity is formed in the side wall of the sealing cover; and the cavity communicates with the moving groove, a first moving assembly capable of driving the two clamping rods to move in the opposite direction is arranged at the cavity, a second moving assembly capable of driving the two clamping rods to move away from each other is arranged at the sealing cover, and the effect of improving the maintenance work efficiency of the tensioning jack is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of tensioning jacks, and in particular to an inner oil passage middle cylinder applied to a hydraulic lock-anchoring tensioning jack. Background Art

[0002] Tensioning jacks are mainly used in prestressed construction. By means of hydraulic or mechanical methods, steel strands, steel bars or wire bundles are accurately tensioned, so that concrete components are pre-stressed to improve their crack resistance and bearing capacity, and are widely used in prestressed concrete structure projects such as bridges, sleepers, and buildings.

[0003] Existing tensioning jacks adopt a multi-stage cylinder nested structure, mainly composed of an outer cylinder, a middle cylinder and an inner cylinder. Among them, the outer cylinder is sleeved outside the middle cylinder by a sliding fit method, and the middle cylinder is sleeved outside the inner cylinder in the same way, forming a compact telescopic structure. An integral cover is provided at the end of the cylinder body. The cover is reliably connected to both the outer cylinder and the inner cylinder through high-strength bolts, which not only ensures the structural stability, but also effectively seals the end of the cylinder body to prevent hydraulic oil leakage. A through-hole avoidance opening is precisely machined at the center position of the cover, which provides a smooth channel for the cable anchor to pass through. A clamping assembly for clamping the cable anchor is provided at one end of the inner cylinder away from the cover. During the tensioning operation, the tensioning jack needs to work synchronously with the anchor ring and the anchor plate. First, one end of the cable anchor is passed through the anchor ring, and then the anchor plate is manually inserted between the inner walls of the cable anchor and the anchor ring to realize the clamping and fixing of the cable anchor. Subsequently, the end of the cable anchor is inserted into the inner cylinder and led out through the avoidance opening of the cover. The position of the jack is adjusted so that the end of the middle cylinder is in close contact with the anchor ring. After starting the equipment, the clamping assembly automatically locks the cable anchor, and at the same time, the outer cylinder drives the inner cylinder to move in the reverse direction through the cover under the hydraulic drive until the preset tensile force is reached, so as to efficiently complete the cable anchor tensioning operation.

[0004] Regarding the above related technologies, during the daily maintenance of the tensioning jack, the traditional bolt connection method requires the staff to repeatedly disassemble and assemble with the help of special tools. The operation process is cumbersome and time-consuming, so there is a defect of low maintenance efficiency of the tensioning jack. Summary of the Invention

[0005] In order to improve the working efficiency of the maintenance of the tensioning jack, the present application provides an inner oil passage middle cylinder applied to a hydraulic lock-anchoring tensioning jack.

[0006] The inner oil passage middle cylinder applied to the hydraulic lock-anchoring tensioning jack provided by the present application adopts the following technical solutions: A middle cylinder with an inner oil circuit used for a hydraulic locking anchor tensioning jack comprises an outer cylinder, a middle cylinder and an inner cylinder, a cover is provided at one end of the outer cylinder, a plug-in groove is provided at one end of the outer cylinder along the circumferential inner wall, the plug-in groove runs through one end of the outer cylinder and is connected end to end, the cover and the plug-in groove are plug-fitted, the outer cylinder is provided with a slot on the side wall of the plug-in groove and the outer wall of the inner cylinder near one end of the plug-in groove, a movable groove is provided through the side wall of the cover, the cover is slidably connected with two clamping rods in the movable groove, the clamping rods and the clamping grooves are clamped and adapted and correspond one to one, a chamber is provided inside the side wall of the cover, the chamber and the movable groove are connected, a first movable component capable of driving the two clamping rods to move toward each other is provided at the chamber, and a second movable component capable of driving the two clamping rods to move away from each other is provided at the cover.

[0007] By adopting the above technical solution, during the installation of the tension jack, the outer cylinder, the middle cylinder and the inner cylinder are first precisely connected, and then the cover is smoothly pushed to the preset position along the direction of the plug-in slot. When the clamping rod and the slot are completely aligned, the second moving component is immediately started to drive the two clamping rods to move back to each other, so that their ends are firmly inserted into the corresponding slots, thereby realizing the quick locking of the cover with the outer cylinder and the inner cylinder. During maintenance operations, it is only necessary to release the clamping rod constraint through the second moving component, and the first moving component will drive the clamping rod to reset toward each other, so that the clamping rod and the slot are automatically disengaged, and the cover can be easily removed without disassembling bolts, saving time, thereby improving the work efficiency of the tension jack maintenance.

[0008] Optionally, the first moving component includes a push block and a first spring, two push blocks are provided, the two push blocks are respectively fixedly connected to one end of two clamping rods close to the chamber, the push block is in the chamber, and the first spring is fixed between the two clamping rods.

[0009] By adopting the above technical solution, after the clamping rod and the corresponding clamping slot are aligned, the second movable component pushes the two push blocks to move away from each other, the first spring is stretched, and at the same time, one end of the clamping rod is clamped into the corresponding clamping slot. When the tensioning jack is disassembled, the second movable component releases the restriction on the push block, the first spring retracts, and drives the two clamping rods to move toward each other, so that the clamping rod and the clamping slot are disengaged, thereby the first movable component realizes the function of driving the two clamping rods to move toward each other.

[0010] Optionally, a sliding groove is provided on the side of the cover facing away from the middle cylinder, a first through hole is provided on a side wall of the sliding groove close to the chamber, the first through hole is communicated with the chamber, the second movable component includes a push rod and a second spring, the push rod is arranged in the sliding groove, one end of the push rod passes through the first through hole and is slidably connected to the cover, an auxiliary plate is fixedly provided on the end of the push rod away from the first through hole, the auxiliary plate is located outside the cover, the second spring is fixedly provided between the auxiliary plate and the bottom wall of the sliding groove, the opposite sides of the two push blocks are both arranged as inclined surfaces, one end of the push rod is located between the two push blocks, and a fixing component capable of fixing the auxiliary plate is provided on the side of the cover facing away from the middle cylinder.

[0011] By adopting the above technical solution, when installing the cover, after the card rod and the corresponding card slot are aligned, the auxiliary plate moves toward the direction of the slide slot, and the auxiliary plate drives the push rod to move. The end of the push rod contacts the inclined surfaces of the two push blocks and pushes the two push blocks to move away from each other. After the card rod moves to the set position, the fixing component fixes the auxiliary plate so that the card rod is not easily separated from the card slot, so that the second moving component realizes the function of driving the two card rods to move away from each other.

[0012] Optionally, the fixing assembly includes a protective shell and a guide plate, the protective shell and the cover are rotatably connected on a side facing away from the middle cylinder, the auxiliary plate is located between the cover and the protective shell, the guide plate is fixedly connected to a side wall of the protective shell facing the cover, and one side of the guide plate is set as a slope.

[0013] By adopting the above technical solution, after the clamping rod and the clamping slot are aligned, the protective shell is rotated, and the protective shell drives the guide plate to move. During the movement of the guide plate, the inclined surface of the guide plate first contacts the auxiliary plate and pushes the auxiliary plate to move toward the direction of the slide slot, and the second spring is compressed. After the auxiliary plate moves to the set position, the inclined surfaces of the auxiliary plate and the guide plate are disengaged, and the auxiliary plate and the side of the guide plate facing the cover abut against each other, making it difficult for the auxiliary plate to move out of the slide slot. When disassembling the tensioning jack, the protective shell is rotated in the opposite direction to disengage the guide plate and the auxiliary plate, and at the same time, the second spring releases the elastic force to push the auxiliary plate toward the outside of the slide slot, and the auxiliary plate drives the push rod to move, so that the clamping rod can be disengaged from the clamping slot, thereby the fixing component realizes the function of fixing the auxiliary plate.

[0014] Optionally, limiting plates are provided on opposite sides of the guide plate, one end of the limiting plate is fixedly connected to the protective shell, and the auxiliary plate is located between the two limiting plates.

[0015] By adopting the above technical solution, during the rotation of the protective shell, the protective shell drives the limit plate to move. After the auxiliary plate moves to the set position, the auxiliary plate abuts against a limit plate, making it difficult for the auxiliary plate to separate from the guide plate. At the same time, under the limiting effect of the auxiliary plates, the two limit plates make it difficult for the protective shell to rotate at will.

[0016] Optionally, the outer cylinder is provided with a first positioning groove at the side wall of the plug-in groove, the first positioning groove runs through one end of the outer cylinder, and a first positioning block is fixedly provided on the outer side wall of the cover, and the first positioning block is plug-fitted with the first positioning groove.

[0017] By adopting the above technical solution, when the cover moves toward the plug-in slot, the first positioning block is first aligned with the first positioning slot. During the movement of the cover, the cover drives the first positioning block to move, and the first positioning block moves in the first positioning slot. After the first positioning block moves to the set position, the clamping rod and the clamping slot on the outer cylinder are aligned. Therefore, the setting of the first positioning slot and the first positioning block facilitates the alignment of the clamping rod and the clamping slot on the outer cylinder.

[0018] Optionally, an annular sealing sleeve is provided at one end of the inner cylinder close to the insertion slot. The annular sealing sleeve is sleeved outside the inner cylinder. The inner wall of the annular sealing sleeve abuts against the inner cylinder, and the outer wall of the annular sealing sleeve abuts against the inner wall of the outer cylinder. One end of the annular sealing sleeve extends into the insertion slot and abuts against the inner bottom wall of the insertion slot. An auxiliary groove is formed along the outer side wall at one end of the inner cylinder close to the cover. The auxiliary groove is connected end to end. A plurality of annular arc-shaped plates are provided at the auxiliary groove. The plurality of annular arc-shaped plates are arranged in sequence along the circumferential side wall of the inner cylinder. One end of the annular arc-shaped plate is embedded in the auxiliary groove, and the ends of adjacent annular arc-shaped plates abut against each other. One side of the annular arc-shaped plate abuts against one side of the annular sealing sleeve.

[0019] By adopting the above technical solution, when installing the tensioning jack, after the outer cylinder and the middle cylinder are sleeved, slide the annular sealing sleeve into the outer cylinder from the insertion slot. After one end of the annular sealing sleeve abuts against the inner bottom wall of the insertion slot, stop moving. Then embed a plurality of annular arc-shaped plates into the auxiliary groove, and the ends of adjacent annular arc-shaped plates abut against each other. Move the inner cylinder into the middle cylinder from the insertion slot. The inner cylinder drives the annular arc-shaped plate to move. After the annular arc-shaped plate abuts against the annular sealing sleeve, the installation of the inner cylinder is completed. Then install the cover. After the cover abuts against the annular arc-shaped plate and the annular sealing sleeve, the cover stops moving and reaches the set position. The arrangement of the annular arc-shaped plate and the annular sealing sleeve plays a limiting role on the inner cylinder. During the installation of the cover, the inner cylinder is not likely to move relative to the outer cylinder.

[0020] Optionally, sealing gaskets are provided at the inner bottom wall of the insertion slot and on the side of the annular arc-shaped plate facing the annular sealing sleeve.

[0021] By adopting the above technical solution, the arrangement of the sealing gaskets improves the sealing performance at the annular sealing sleeve, making it difficult for the hydraulic oil to leak from the annular sealing sleeve.

[0022] Optionally, a second positioning block is fixedly provided on the side wall of the annular sealing sleeve. The second positioning block is inserted and adapted to the first positioning groove. A plurality of second positioning grooves are formed on the side of the annular sealing sleeve facing the cover. The plurality of second positioning grooves are arranged in sequence along the circumferential side wall of the annular sealing sleeve. A third positioning block is fixedly provided on one side of the annular arc-shaped plate. The third positioning block is inserted and adapted to the second positioning groove and corresponds to it one by one. A plurality of third positioning grooves are formed at the inner bottom wall of the auxiliary groove of the inner cylinder. The plurality of third positioning grooves are arranged in sequence along the circumferential side wall of the auxiliary groove. A fourth positioning block is fixedly provided on the side of the annular arc-shaped plate facing the inner bottom wall of the auxiliary groove. The fourth positioning block is inserted and adapted to the third positioning groove and corresponds to it one by one.

[0023] By adopting the above technical solution, during the process of moving the annular seal sleeve into the outer cylinder, first align the second positioning block with the first positioning groove, then the annular seal sleeve drives the second positioning block to move within the first positioning groove. When inserting the annular arc plate into the auxiliary groove, align the fourth positioning block with the third positioning groove, and then insert the annular arc plate into the auxiliary groove. During the process of moving the inner cylinder towards the middle cylinder, first align the third positioning block with the second positioning groove. The inner cylinder drives the annular arc plate to move, and the annular arc plate drives the third positioning block to move. The third positioning block moves within the second positioning groove. In this way, the positioning of the inner cylinder is achieved, which facilitates the alignment of the clamping rod with the card slot on the inner cylinder.

[0024] Optionally, a top anchor head is fixedly provided at one end of the middle cylinder away from the cover. A top anchor tube and a small piston are arranged inside the top anchor head. Both the top anchor tube and the small piston are slidably connected to the top anchor head. The small piston is located at one end of the top anchor tube close to the cover. An inner oil passage is provided along the length direction on the side of the middle cylinder close to the cover. A hydraulic cavity is provided at the top anchor head. The end of the inner oil passage away from the cover is connected to the hydraulic cavity. One end of the small piston extends into the hydraulic cavity. The small piston is slidably connected to the top anchor head. A third spring is fixedly provided between the top anchor tube and the top anchor head. The third spring is sleeved outside the top anchor tube.

[0025] By adopting the above technical solution, after the anchor cable passes through the anchor ring, insert the anchor piece between the anchor ring and the anchor cable. Then one end of the anchor cable passes through the tensioning jack. Move the tensioning jack, and the tensioning jack drives the top anchor head to move. The top anchor head abuts against the anchor ring. Deliver hydraulic oil into the tensioning jack. During the extension process of the tensioning jack, the hydraulic oil flows along the inner oil passage to the hydraulic cavity. As the hydraulic pressure in the hydraulic cavity continuously increases, the hydraulic oil pushes the small piston towards the anchor ring direction. The small piston pushes the top anchor tube to move, and the third spring is stretched. The top anchor tube abuts against the anchor piece and always applies a force towards the inside of the anchor ring to the anchor piece. So that after the anchor cable undergoes deformation during tensioning, the anchor piece can always clamp and fix the anchor cable, thereby improving the retention coefficient of the anchoring force.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the cover is inserted into the insertion slot, the second moving component drives the two clamping rods to move away from each other. The ends of the two clamping rods are clamped into the corresponding card slots, realizing the clamping and fixing of the cover to the outer cylinder and the inner cylinder. When maintaining the jack, the second moving component releases the restriction on the clamping rod, and the first moving component drives the two clamping rods to move towards each other. The clamping rod and the card slot are disengaged, releasing the clamping and fixing of the cover to the outer cylinder and the inner cylinder. There is no need to disassemble and assemble bolts, saving time, thus improving the maintenance efficiency of the tensioning jack; 2. Through the setting of the first positioning groove and the first positioning block, it facilitates the alignment of the clamping rod with the card slot on the outer cylinder; 3. The restriction of the inner cylinder by the annular sealing sleeve and the annular arc-shaped plate makes it difficult for the inner cylinder to move relative to the outer cylinder when installing the cover, which facilitates the alignment of the clamping rod and the clamping groove on the inner cylinder. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a middle cylinder with an internal oil passage applied to a hydraulic lock-anchorage tensioning jack according to an embodiment of the present application; Figure 2 is a cross-sectional view showing the internal structure of the outer cylinder according to an embodiment of the present application; Figure 3 is Figure 2 a partial enlarged schematic view of part A in Figure 4 is Figure 2 a partial enlarged schematic view of part B in Figure 5 is a schematic structural diagram showing the fixing component according to an embodiment of the present application.

[0028] In the figure, 1. Outer cylinder; 11. Insertion slot; 12. First positioning slot; 13. Sealing gasket; 2. Middle cylinder; 21. Top anchor head; 211. Hydraulic cavity; 22. Top anchor pipe; 23. Small piston; 24. Internal oil passage; 25. Third spring; 3. Inner cylinder; 31. Auxiliary slot; 32. Annular arc-shaped plate; 321. Third positioning block; 322. Fourth positioning block; 33. Third positioning slot; 4. Cover; 41. Moving slot; 42. Clamping rod; 43. Chamber; 44. Sliding slot; 45. First through hole; 46. First positioning block; 5. Clamping groove; 6. First moving component; 61. Pushing block; 62. First spring; 7. Second moving component; 71. Push rod; 711. Auxiliary plate; 72. Second spring; 8. Fixing component; 81. Protective shell; 811. Limiting plate; 82. Guide plate; 9. Annular sealing sleeve; 91. Second positioning block; 92. Second positioning slot. Detailed Embodiment

[0029] The following is a further detailed description of the present application in conjunction with the attached Figures 1 - 5 drawings.

[0030] An embodiment of the present application discloses a middle cylinder with an internal oil passage applied to a hydraulic lock-anchorage tensioning jack.

[0031] Referring to Figure 1 , a middle cylinder with an internal oil passage applied to a hydraulic lock-anchorage tensioning jack includes an outer cylinder 1 and a middle cylinder 2. The outer cylinder 1 is sleeved outside the middle cylinder 2. The length directions of the outer cylinder 1 and the middle cylinder 2 are parallel. A cover 4 is inserted at one end of the outer cylinder 1, and a top anchor head 21 is fixedly provided at the end of the middle cylinder 2 away from the cover 4.

[0032] Referring to Figure 1 , Figure 2 andFigure 3 , an inner cylinder 3 is arranged in the middle cylinder 2. The length direction of the inner cylinder 3 is parallel to the length direction of the middle cylinder 2. A top anchor head 21 is fixedly arranged at one end of the middle cylinder 2 away from the cover 4. A top anchor pipe 22 and a small piston 23 are arranged in the top anchor head 21. Both the top anchor pipe 22 and the small piston 23 are slidably connected to the top anchor head 21. The top anchor head 21 is arranged on the side of the small piston 23 away from the cover 4. A hydraulic chamber 211 is arranged on the side of the top anchor head 21 facing the small piston 23. An inner oil passage 24 is opened along the length direction on the side of the middle cylinder 2 close to the cover 4. One end of the inner oil passage 24 close to the top anchor head 21 is communicated with the hydraulic chamber 211. A third spring 25 is fixedly arranged between the top anchor pipe 22 and the top anchor head 21, and the third spring 25 is sleeved outside the top anchor pipe 22.

[0033] After the anchor cable passes through the anchor ring and the tensioning jack, move the tensioning jack towards the anchor ring direction so that one end of the top anchor head 21 abuts against the anchor ring. Then, convey hydraulic oil into the tensioning jack. The outer cylinder 1 and the inner cylinder 3 move relative to the middle cylinder 2 towards the direction away from the anchor ring. At the same time, the hydraulic oil flows along the inner oil passage 24 into the hydraulic chamber 211. As the hydraulic pressure in the hydraulic chamber 211 gradually increases, the hydraulic oil pushes the small piston 23 to move. The small piston 23 pushes the top anchor pipe 22 to move, and the third spring 25 is compressed. The top anchor pipe 22 abuts against the anchor plate and always applies a force to the anchor plate in the direction away from the top anchor head 21, so that after the anchor cable deforms during the tensioning process, the anchor plate can always clamp and fix the anchor cable. After the tensioning is completed, the hydraulic oil flows back, and the third spring 25 releases its elastic force, pushing the top anchor pipe 22 to move, and the top anchor pipe 22 drives the small piston 23 to return to its original position.

[0034] Reference Figure 1 、 Figure 2 and Figure 4 , on the side of the outer cylinder 1 close to the cover 4, a plug-in groove 11 is opened along the circumferential inner wall. The plug-in groove 11 is connected end to end and penetrates through one side wall of the outer cylinder 1. The cover 4 is plug-in and adapted to the plug-in groove 11. An annular sealing sleeve 9 is sleeved at one end of the inner cylinder 3 close to the plug-in groove 11. The inner wall of the annular sealing sleeve 9 abuts against the outer side wall of the inner cylinder 3, and the outer side wall of the annular sealing sleeve 9 abuts against the inner wall of the outer cylinder 1. One end of the annular sealing sleeve 9 extends into the plug-in groove 11. An auxiliary groove 31 is opened along the axial outer side wall at one end of the inner cylinder 3 close to the cover 4. The auxiliary groove 31 is connected end to end. A plurality of annular arc-shaped plates 32 are arranged at the inner cylinder 3 at the auxiliary groove 31. One end of the annular arc-shaped plate 32 is embedded in the auxiliary groove 31. The plurality of annular arc-shaped plates 32 are arranged in sequence along the auxiliary groove 31. The ends of adjacent annular arc-shaped plates 32 abut against each other. Sealing gaskets 13 are arranged at the bottom wall of the plug-in groove 11 and on the side of the annular arc-shaped plate 32 facing the annular sealing sleeve 9. The sealing gaskets 13 are annular. In the embodiment of the present application, the sealing gaskets 13 are made of rubber material.

[0035] When installing the inner cylinder 3, first, sleeved the annular seal 9 on one end of the inner cylinder 3. Then, insert multiple annular arc-shaped plates 32 into the auxiliary groove 31, and move the middle cylinder 2 towards the inside of the inner cylinder 3. The middle cylinder 2 drives the annular arc-shaped plates 32 and the annular seal 9 to move. After the annular seal 9 moves to the set position, the annular seal 9 tightly abuts against the gasket 13 at the inner bottom wall of the insertion slot 11, so that the hydraulic oil is not easily leaked out from the gap between the annular seal 9 and the inner wall of the outer cylinder 1. Then, insert the cover 4. After the cover 4 moves to the set position, the cover 4 abuts against the annular seal 9 and the annular arc-shaped plates 32, and at the same time, pushes the annular arc-shaped plates 32 and the gasket 13 at the auxiliary groove 31 to tightly abut, so that the hydraulic oil is not easily leaked out from the gap between the annular seal 9 and the outer side wall of the inner cylinder 3. At the same time, due to the blocking effect of the inner bottom wall of the insertion slot 11 on the annular seal 9 and the blocking effect of the annular seal 9 on the annular arc-shaped plates 32, the inner cylinder 3 is not easily moved further towards the inside of the middle cylinder 2.

[0036] Reference Figure 1 、 Figure 2 and Figure 4 As shown in, a plurality of moving grooves 41 are formed through the side wall of the cover 4. The length direction of the moving grooves 41 is perpendicular to the length direction of the outer cylinder 1. Two clamping rods 42 are slidably connected to the cover 4 in the moving grooves 41. A plurality of clamping grooves 5 are formed on the side wall of the insertion slot 11 of the outer cylinder 1 and on the outer side wall of one end of the inner cylinder 3 close to the cover 4. The plurality of clamping grooves 5 on the outer cylinder 1 are arranged in sequence along the circumferential inner wall, and the plurality of clamping grooves 5 on the inner cylinder 3 are arranged in sequence along the circumferential outer side wall of the inner cylinder 3. The clamping rods 42 and the clamping grooves 5 are in clamping fit and correspond one by one. Chambers 43 are formed at the moving grooves 41 of the cover 4. The chambers 43 are communicated with the moving grooves 41. A first moving assembly 6 capable of driving the two clamping rods 42 to move towards each other is arranged at the chambers 43. A plurality of sliding grooves 44 are formed on the side of the cover 4 away from the middle cylinder 2. A first through hole 45 is formed at the inner bottom wall of the sliding grooves 44 of the cover 4. The first through hole 45 is communicated with and corresponds to the chambers 43 one by one. A second moving assembly 7 for driving the two push rods 71 to move away from each other is arranged at the sliding grooves 44.

[0037] The first moving assembly 6 includes a push block 61 and a first spring 62. There are two push blocks 61. The two push blocks 61 are respectively fixedly connected to the adjacent ends of the two clamping rods 42. The push block 61 is located in the chamber 43. The first spring 62 is fixed between the two clamping rods 42. The length direction of the first spring 62 is parallel to the length direction of the clamping rod 42. The opposite sides of the two push blocks 61 are both set as inclined surfaces.

[0038] The second moving component 7 includes a push rod 71 and a second spring 72. The push rod 71 is arranged in the slide groove 44. One end of the push rod 71 passes through the first through hole 45 and extends into the chamber 43 and is located between the two push blocks 61. The end of the push rod 71 away from the chamber 43 extends to the outside of the slide groove 44. An auxiliary plate 711 is fixed to the end of the push rod 71 outside the slide groove 44. The auxiliary plate 711 and the push rod 71 are perpendicular. The second spring 72 is fixed between the auxiliary plate 711 and the bottom wall of the slide groove 44, and the second spring 72 is sleeved outside the push rod 71.

[0039] When installing the tensioning jack, after the cover 4 moves to the set position and the clamping rod 42 is aligned with the corresponding clamping slot 5, the auxiliary plate 711 moves toward the slide slot 44, the auxiliary plate 711 drives the push rod 71 to move, the second spring 72 is compressed, the push rod 71 contacts the inclined surface of the push block 61, and pushes the two push blocks 61 to move in the direction away from each other, the push block 61 drives the clamping rod 42 to move, the first spring 62 is stretched, and one end of the clamping rod 42 is clamped in the corresponding clamping slot 5, so that the cover 4 and The inner cylinder 3 and the outer cylinder 1 are fixed by clamping. When the tensioning jack needs to be removed, the second spring 72 releases its elastic force to push the auxiliary plate 711 to move away from the slide groove 44. The auxiliary plate 711 drives the push rod 71 to move toward the movable groove 41, but the push rod 71 is always in contact with the inclined surface of the push block 61. The first spring 62 contracts and drives the two clamping rods 42 to move toward each other. The clamping rod 42 and the clamping groove 5 are disengaged, and the clamping fixation of the cover 4 with the inner cylinder 3 and the outer cylinder 1 is released. There is no need to disassemble the bolts, which saves time.

[0040] refer to Figure 2 , Figure 4 and Figure 5 A fixing assembly 8 capable of fixing the auxiliary plate 711 is provided on the side of the cover 4 facing away from the middle cylinder 2. The fixing assembly 8 includes a protective shell 81 and a guide plate 82. The protective shell 81 and the cover 4 are rotatably connected. A plurality of guide plates 82 are provided. The plurality of guide plates 82 are evenly fixed in the protective shell 81. The plurality of guide plates 82 correspond to the auxiliary plates 711 one by one. One side of the guide plate 82 is set as an inclined surface. The guide plate 82 is in an arc shape. Limiting plates 811 are provided on opposite sides of the guide plate 82. The limiting plates 811 are fixedly connected to the protective shell 81, and the auxiliary plate 711 is located between the corresponding two limiting plates 811.

[0041] After the clamping rod 42 and the clamping groove 5 are aligned, the protective shell 81 is rotated. The protective shell 81 drives the guide plate 82 and the limiting plate 811 to move. During the movement of the guide plate 82, the inclined surface of the guide plate 82 first contacts the auxiliary plate 711 and pushes the auxiliary plate 711 to move towards the chute 44. The second spring 72 is compressed. After the push rod 71 moves to the set position, the auxiliary plate 711 and the inclined surface of the guide plate 82 are separated. The auxiliary plate 711 and the side of the guide plate 82 facing the cover 4 are in contact, and at the same time, the limiting plate 811 on one side of the auxiliary plate 711 and the guide plate 82 are in contact, making it difficult for the auxiliary plate 711 to separate from the guide plate 82. The guide plate 82 blocks the auxiliary plate 711, and it is not easy for the auxiliary plate 711 to move away from the chute 44. When the tensioning jack needs to be disassembled, the protective shell 81 is rotated in the reverse direction, the auxiliary plate 711 is gradually separated from the guide plate 82, and the second spring 72 gradually releases the elastic force to push the auxiliary plate 711 to move away from the chute 44.

[0042] Reference Figure 2 And Figure 4 For the outer cylinder 1, a first positioning groove 12 is provided on the side wall of the insertion groove 11. A first positioning block 46 is fixedly provided on the side wall of the cover 4. The first positioning block 46 and the first positioning groove 12 are inserted and matched. One end of the annular sealing sleeve 9 extending into the insertion groove 11 is fixedly provided with a second positioning block 91. The second positioning block 91 and the first positioning groove 12 are inserted and matched. A second positioning groove 92 is provided on the side of the annular sealing sleeve 9 facing the cover 4. The second positioning groove 92 penetrates through one side wall of the annular sealing sleeve 9. A third positioning block 321 is fixedly provided on one side of the annular arc plate 32. The third positioning block 321 and the second positioning groove 92 are inserted and matched. The inner cylinder 3 is provided with a plurality of third positioning grooves 33 at the bottom wall of the auxiliary groove 31. A fourth positioning block 322 is fixedly provided on the side of the annular arc plate 32 facing the bottom wall of the auxiliary groove 31. The fourth positioning block 322 and the third positioning grooves 33 are inserted and matched and correspond one by one.

[0043] During the installation of the annular arc plate 32, align the fourth positioning block 322 with the third positioning groove 33, then embed one end of the annular arc plate 32 into the auxiliary groove 31, embed the fourth positioning block 322 into the third positioning groove 33, rotate the annular seal 9 to align the third positioning block 321 with the second positioning groove 92, push the annular arc plate 32 towards the annular seal 9, so that the third positioning block 321 slides into the second positioning groove 92. Then move the inner cylinder 3 towards the inside of the middle cylinder 2, and at the same time align the second positioning block 91 on the annular seal 9 with the first positioning groove 12. The inner cylinder 3 drives the annular seal 9 and the annular arc plate 32 to move, and the second positioning block 91 moves in the first positioning groove 12. After the inner cylinder 3 moves to the set position, move the cover 4 towards the insertion groove 11, and at the same time align the first positioning block 46 connected to the cover 4 with the first positioning groove 12. The cover 4 drives the first positioning block 46 to move. After the cover 4 moves to the set position, the cover 4 tightly abuts against the annular seal 9 and the annular arc plate 32, and at the same time the latch 42 aligns with the corresponding card slot 5.

[0044] The implementation principle of the inner oil passage middle cylinder of the hydraulic lock anchor tensioning jack in the embodiment of the present application is as follows: when maintaining the tensioning jack, the fixing component 8 releases the restriction on the auxiliary plate 711, the second spring 72 releases its elastic force, and pushes the auxiliary plate 711 to move away from the sliding groove 44. The auxiliary plate 711 drives the push rod 71 to move, and the first spring 62 contracts, driving the corresponding two latches 42 to move towards each other. The latches 42 disengage from the card slots 5, releasing the clamping and fixing of the cover 4 to the inner cylinder 3 and the outer cylinder 1. There is no need to disassemble and assemble bolts, saving time, and thus improving the maintenance efficiency of the tensioning jack.

[0045] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An inner oil passage middle cylinder applied to a hydraulic lock anchor tensioning jack, comprising an outer cylinder (1), a middle cylinder (2) and an inner cylinder (3), wherein a sealing cover (4) is arranged at one end of the outer cylinder (1), and is characterized in that: One end of the outer cylinder (1) is provided with a socket groove (11) along the circumferential inner wall. The socket groove (11) penetrates through one end of the outer cylinder (1) and is connected end to end. The cover (4) is inserted and adapted to the socket groove (11). The outer cylinder (1) is provided with clamping grooves (5) on the side wall of the socket groove (11) and on the outer wall of the inner cylinder (3) near one end of the socket groove (11). A moving groove (41) is penetrated through the side wall of the cover (4). Two clamping rods (42) are slidably connected in the moving groove (41) of the cover (4). The clamping rods (42) are clamped and adapted to the clamping grooves (5) and are in one-to-one correspondence. A chamber (43) is provided inside the side wall of the cover (4). The chamber (43) is communicated with the moving groove (41). A first moving component (6) capable of driving the two clamping rods (42) to move towards each other is arranged at the chamber (43). A second moving component (7) capable of driving the two clamping rods (42) to move away from each other is arranged at the cover (4).

2. The inner oil passage middle cylinder applied to the hydraulic lock anchor tensioning jack according to claim 1, characterized in that: The first moving component (6) includes a push block (61) and a first spring (62). There are two push blocks (61). The two push blocks (61) are respectively fixedly connected to one end of the two clamping rods (42) close to the chamber (43). The push block (61) is located inside the chamber (43). The first spring (62) is fixed between the two clamping rods (42).

3. The inner oil passage middle cylinder applied to the hydraulic lock anchor tensioning jack according to claim 2, characterized in that: A sliding groove (44) is provided on the side of the cover (4) facing away from the middle cylinder (2). A first through hole (45) is provided on one side wall of the sliding groove (44) close to the chamber (43). The first through hole (45) is communicated with the chamber (43). The second moving component (7) includes a push rod (71) and a second spring (72). The push rod (71) is arranged in the sliding groove (44). One end of the push rod (71) passes through the first through hole (45) and is slidably connected to the cover (4). An auxiliary plate (711) is fixedly arranged at the end of the push rod (71) away from the first through hole (45). The auxiliary plate (711) is located outside the cover (4). The second spring (72) is fixed between the auxiliary plate (711) and the inner bottom wall of the sliding groove (44). The opposite sides of the two push blocks (61) are both provided with inclined surfaces. One end of the push rod (71) is located between the two push blocks (61). A fixing component (8) capable of fixing the auxiliary plate (711) is arranged on the side of the cover (4) facing away from the middle cylinder (2).

4. The inner oil path middle cylinder applied to a hydraulic lock anchor tensioning jack according to claim 3, wherein: The fixing component (8) includes a protective shell (81) and a guide plate (82). The protective shell (81) is rotatably connected to the side of the cover (4) facing away from the middle cylinder (2). The auxiliary plate (711) is located between the cover (4) and the protective shell (81). The guide plate (82) is fixedly connected to the side wall of the protective shell (81) facing the cover (4). One side of the guide plate (82) is provided with an inclined surface.

5. The inner oil passage middle cylinder applied to a hydraulic lock anchor tensioning jack according to claim 4, characterized in that: Limiting plates (811) are provided on both opposite sides of the guide plate (82). One end of the limiting plate (811) is fixedly connected to the protective shell (81). The auxiliary plate (711) is located between the two limiting plates (811).

6. The inner oil passage middle cylinder applied to a hydraulic lock anchor tensioning jack according to claim 1, wherein: The outer cylinder (1) is provided with a first positioning groove (12) at the side wall of the insertion groove (11). The first positioning groove (12) penetrates through one end of the outer cylinder (1). A first positioning block (46) is fixedly arranged on the outer side wall of the cover (4). The first positioning block (46) and the first positioning groove (12) are inserted and adapted to each other.

7. The inner oil-way middle cylinder applied to a hydraulic lock-anchorage tensioning jack according to claim 1, wherein: One end of the inner cylinder (3) close to the insertion groove (11) is provided with an annular sealing sleeve (9). The annular sealing sleeve (9) is sleeved outside the inner cylinder (3). The inner wall of the annular sealing sleeve (9) abuts against the inner cylinder (3). The outer wall of the annular sealing sleeve (9) abuts against the inner wall of the outer cylinder (1). One end of the annular sealing sleeve (9) extends into the insertion groove (11) and abuts against the inner bottom wall of the insertion groove (11). An auxiliary groove (31) is formed in the outer side wall of one end of the inner cylinder (3) close to the cover (4). The auxiliary groove (31) is connected end to end. A plurality of annular arc-shaped plates (32) are arranged at the auxiliary groove (31). The plurality of annular arc-shaped plates (32) are arranged in sequence along the circumferential side wall of the inner cylinder (3). One end of the annular arc-shaped plate (32) is embedded in the auxiliary groove (31). The ends of adjacent annular arc-shaped plates (32) abut against each other. One side of the annular arc-shaped plate (32) abuts against one side of the annular sealing sleeve (9).

8. The inner oil passage middle cylinder applied to the hydraulic lock anchor tensioning jack according to claim 7, characterized in that: Sealing gaskets (13) are arranged at the inner bottom wall of the insertion groove (11) and on one side of the annular arc-shaped plate (32) facing the annular sealing sleeve (9).

9. The inner oil passage intermediate cylinder applied to a hydraulic lock-anchoring tension jack according to claim 7, characterized in that: A second positioning block (91) is fixedly arranged on the side wall of the annular sealing sleeve (9). The second positioning block (91) and the first positioning groove (12) are inserted and adapted to each other. A plurality of second positioning grooves (92) are formed on one side of the annular sealing sleeve (9) facing the cover (4). The plurality of second positioning grooves (92) are arranged in sequence along the circumferential side wall of the annular sealing sleeve (9). A third positioning block (321) is fixedly arranged on one side of the annular arc-shaped plate (32). The third positioning block (321) and the second positioning groove (92) are inserted and adapted to each other and are in one-to-one correspondence. A plurality of third positioning grooves (33) are formed in the inner bottom wall of the auxiliary groove (31) of the inner cylinder (3). The plurality of third positioning grooves (33) are arranged in sequence along the circumferential side wall of the auxiliary groove (31). A fourth positioning block (322) is fixedly arranged on one side of the annular arc-shaped plate (32) facing the inner bottom wall of the auxiliary groove (31). The fourth positioning block (322) and the third positioning groove (33) are inserted and adapted to each other and are in one-to-one correspondence.

10. The inner oil passage middle cylinder applied to the hydraulic lock anchor tensioning jack according to claim 1, characterized in that: One end of the middle cylinder (2) far away from the cover (4) is fixedly provided with a top anchor head (21). Inside the top anchor head (21), there are arranged a top anchor pipe (22) and a small piston (23). Both the top anchor pipe (22) and the small piston (23) are slidably connected to the top anchor head (21). The small piston (23) is located at one end of the top anchor pipe (22) close to the cover (4). On one side of the middle cylinder (2) close to the cover (4), an internal oil passage (24) is opened along its own length direction. A hydraulic cavity (211) is arranged at the top anchor head (21). One end of the internal oil passage (24) far away from the cover (4) is communicated with the hydraulic cavity (211). One end of the small piston (23) extends into the hydraulic cavity (211). The small piston (23) is slidably connected to the top anchor head (21). A third spring (25) is fixedly arranged between the top anchor pipe (22) and the top anchor head (21). The third spring (25) is sleeved outside the top anchor pipe (22).

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