Hydraulic bolt tensioner

Abstract

The application belongs to the technical field of hydraulic bolts, and particularly relates to a hydraulic bolt tightness device, which comprises a hydraulic nut body and an assembly seat, a screwing seat is fixedly installed below the hydraulic nut body, an assembly hole is formed below the screwing seat, an assembly screw rod head is fixedly installed above the assembly seat, the shape of the assembly hole is matched with the shape of the assembly screw rod head, and the shape of the hydraulic nut body is matched with the shape of the assembly screw rod head; the screwing seat on the surface of the hydraulic nut body is screwed into the surface of the assembly screw rod head, and the hydraulic nut body can be stably installed on the surface of the assembly seat under the fixing mechanism on the surfaces of the screwing seat and the assembly screw rod head, the problem that the hydraulic nut is welded on the surface of the assembly seat in the prior art is avoided, the hydraulic nut is convenient to replace, and the effect of reducing looseness can be obtained under high-frequency vibration of external equipment, the hydraulic nut has high flexibility, and the practicality of the hydraulic nut is improved.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic bolt technology, specifically a hydraulic bolt tightening and loosening device. Background Technology

[0002] Hydraulic bolts are a new type of bolt used on flange couplings. They consist of a tension bolt with a tapered outer surface, an intermediate tapered sleeve with a correspondingly tapered inner hole, and two set nuts. The tension bolt has threads at both ends, and the intermediate tapered sleeve is cylindrical with a certain gap between it and the bolt hole. Its biggest advantage is that it is easy and time-saving to install and remove, so it is gradually replacing traditional fastening bolts.

[0003] Hydraulic bolts can be used in couplings connecting propeller shafts and intermediate shafts, intermediate shafts and intermediate shafts, intermediate shafts and main engine or gearbox output shafts in ship shafting systems, as well as in steam turbines, rolling mills or other connecting parts subjected to high torque.

[0004] After the hydraulic bolts are disassembled, the taper of the tension bolt, the inner tapered hole and outer circle of the intermediate tapered sleeve, and the bolt holes on the coupling all retain their original surface roughness, so they can be reused. However, it is currently quite troublesome to adjust their tightness.

[0005] Therefore, the present invention provides a hydraulic bolt tightening device. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a hydraulic bolt tightening device, comprising a hydraulic nut body and an assembly seat. A tightening seat is fixedly installed below the hydraulic nut body, and an assembly hole is opened below the tightening seat. An assembly screw head is fixedly installed above the assembly seat. The shape of the assembly hole matches the shape of the assembly screw head. The shapes of the hydraulic nut body and the assembly screw head are matched. A fixing mechanism is provided on the inner wall of the tightening seat and the outer surface of the assembly screw head. The fixing mechanism is used to fix the tightening seat and the assembly screw head together.

[0008] Preferably, the fixing mechanism includes an embedded groove formed in the wall of the mounting hole of the tightening seat. Multiple embedded grooves are formed in a circumferential array within the mounting hole of the tightening seat. The fixing mechanism also includes multiple elastic clips installed on the mounting screw head. The multiple elastic clips and embedded grooves are arranged in a one-to-one correspondence, and the shapes of the elastic clips and embedded grooves are adapted to each other. During operation, as the hydraulic nut body is gradually installed above the mounting seat, as the tightening seat tightens towards the surface of the mounting screw head until the tightening seat is screwed into the entire surface of the mounting screw head, the elastic clips on the surface of the mounting screw head will engage in the embedded grooves on the inner wall of the tightening seat. At this point, the hydraulic nut body can be initially fixed, facilitating its subsequent use.

[0009] Preferably, each of the embedding slots has a through hole in its wall, a telescopic seat is fixedly installed on the outer surface of the elastic clip, an elastic embedding rod is slidably installed inside the telescopic seat, the shape of the elastic embedding rod is adapted to the shape of the through hole, the through hole extends into the interior of the tightening seat, and both the embedding slot and the outer surface of the elastic clip are provided with an arc-shaped chamfer.

[0010] Preferably, a limiting spring is sleeved on the outer surface of the elastic embedding rod, and a rectangular groove is formed on the inner wall of the telescopic seat. A rectangular plate is installed at the position corresponding to the elastic embedding rod and the rectangular groove. The shape of the rectangular plate matches the shape of the rectangular groove, and the rectangular plate is slidably installed in the rectangular groove. During operation, when the elastic embedding rod is subjected to pressure from the embedding groove, the elastic embedding rod will cause the limiting spring on its surface to contract, and the elastic embedding rod will cause the rectangular plate to move inside the rectangular groove. When the elastic embedding rod is aligned with the through hole, under the restoring force of the limiting spring, the elastic embedding rod will extend into the through hole. Moreover, under the mutual limiting of the rectangular plate and the rectangular groove, it can be ensured that the elastic embedding rod is on the same axis when moving, thereby facilitating the elastic embedding rod to be inserted into the through hole.

[0011] Preferably, a deflection seat is fixedly installed on the outer surface of the elastic embedded rod. Two deflection seats are provided and are symmetrically arranged with respect to the elastic embedded rod. A limit support plate is rotatably installed on the outer surface of each deflection seat. The distance between adjacent limit support plates is adapted to the shape of the through hole. A limit mechanism is provided on the surface of the limit support plate to fix the limit support plate to the outer surface of the tightening seat. The length of the elastic embedded rod is adapted to the length of the through hole. During operation, when the elastic embedded rod recovers under the elastic force of the limit spring, the limit support plate on the outer surface of the elastic embedded rod will move simultaneously on the inner wall of the through hole. Moreover, the limit support plate is deflected by the pressure of the through hole. When the limit spring fully recovers, the limit support plate will extend out of the through hole. At this time, under the action of the limit mechanism, the two limit support plates will be stuck on the outer surface of the tightening seat. This ensures the fixing effect of the hydraulic nut and avoids the problem of welding the hydraulic nut to the surface of the mounting seat in the prior art. It also improves the service life of the hydraulic nut to a certain extent.

[0012] Preferably, the limiting mechanism includes a telescopic spring installed on the outer surface of the limiting support plate. The side of the telescopic spring away from the limiting support plate is fixedly installed on the surface of the deflection seat. The shape of the limiting support plate at the contact position with the through hole is arc-shaped. During operation, when the limiting support plate moves within the inner wall of the through hole, the pressure on the limiting support plate will compress the telescopic spring on its side surface. When the limiting support plate extends out of the through hole, under the recovery of the elastic force of the telescopic spring, the two limiting support plates can be in an expanded state and wrap around the outer surface of the tightening seat, thus improving the fixing effect between the two.

[0013] Preferably, a limiting post is fixedly installed on the outer surface of the deflection seat, and the side of the limiting post away from the deflection seat contacts the surface of the deflection seat; during operation, the limiting post can limit the position of the limiting support plate and ensure the wrapping effect of the adjacent limiting support plate on the tightening seat.

[0014] Preferably, each of the limiting support plates has a locking hole on its outer surface, and an assembly rod is fixedly installed on the outer peripheral surface of the tightening seat at the position corresponding to the locking hole. The shape of the assembly rod matches the shape of the locking hole. During operation, when the limiting support plate wraps around the outer surface of the tightening seat, the assembly rod on the surface of the tightening seat will be locked into the locking hole, thus further improving the fixing effect of the tightening seat and enabling it to better adapt to different high-frequency vibrations.

[0015] Preferably, a ratchet plate one is rotatably mounted on the inner wall of the card hole, and a ratchet plate two is fixedly mounted on the outer surface of the assembly rod. Multiple ratchet plates one and two are provided and are arranged adjacent to each other. Both ratchet plates one and two are conical in shape and face opposite directions.

[0016] Preferably, a spring is installed on one side of the first ratchet plate, and the side of the spring away from the first ratchet plate is installed on the inner wall of the locking hole. The spring is designed to facilitate the subsequent locking of the first ratchet plate and the second ratchet plate.

[0017] The beneficial effects of this invention are as follows: 1. The hydraulic bolt tightening device of the present invention can securely install the hydraulic nut body on the surface of the mounting base by means of a fixing mechanism on the surface of the tightening seat and the mounting screw head, avoiding the problem of welding the hydraulic nut to the surface of the mounting base in the prior art, which facilitates the subsequent replacement of the hydraulic nut. Moreover, it can also reduce loosening under the high-frequency vibration of external equipment, making the hydraulic nut highly flexible in use and improving the practicality of the hydraulic nut.

[0018] 2. The hydraulic bolt tightening device of the present invention uses a limiting support plate that is deflected by the pressure of the through hole. When the limiting spring is fully restored, the limiting support plate will extend out of the through hole. At this time, under the action of the limiting mechanism, the two limiting support plates will be locked on the outer surface of the tightening seat. This ensures the fixing effect of the hydraulic nut and avoids the problem of welding the hydraulic nut to the surface of the mounting seat in the prior art. It also improves the service life of the hydraulic nut to a certain extent.

[0019] 3. The hydraulic bolt tightening device of the present invention allows for easy replacement of hydraulic nuts after prolonged use. Operators simply need to manually pull the elastic insert rod away from the through hole, moving it a certain distance away. Then, press the limiting plates on both sides, pressing the limiting plates and the elastic insert rod into the through hole until the elastic insert rod is positioned inside the insert groove. Finally, tighten the seat in the opposite direction to slowly remove the hydraulic nut, allowing for replacement with a new one. This device offers high flexibility, convenient operation, and easier replacement. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the assembly screw head part in this invention; Figure 3 In this invention Figure 2 Enlarged view of the structure at point A; Figure 4 This is a schematic diagram of the elastic embedded rod located inside the through hole in this invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the assembly base in this invention; Figure 6 This is a schematic diagram of the telescopic seat structure in this invention; Figure 7 This is a schematic diagram of the structure in this invention where the limiting support plate is supported on the outside of the tightening seat; Figure 8 This is a schematic diagram of the structure of the limiting support plate located inside the through hole in this invention; Figure 9 This is a schematic diagram of the limiting support plate structure in this invention; Figure 10 This is a schematic diagram of the structure of the first and second ratchet plates in this invention.

[0022] In the diagram: 1. Hydraulic nut body; 2. Assembly seat; 3. Tightening seat; 4. Assembly screw head; 5. Embedded groove; 6. Elastic chuck; 7. Through hole; 8. Telescopic seat; 801. Rectangular groove; 9. Elastic embedded rod; 901. Rectangular plate; 10. Limiting spring; 11. Deflection seat; 12. Limiting support plate; 14. Telescopic spring; 15. Limiting post; 16. Clamping hole; 17. Assembly rod; 20. Racket plate one; 21. Racket plate two. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figures 1 to 5 As shown in the embodiment of the present invention, a hydraulic bolt tightening device includes a hydraulic nut body 1 and an assembly seat 2. A tightening seat 3 is fixedly installed below the hydraulic nut body 1. An assembly hole is provided below the tightening seat 3. An assembly screw head 4 is fixedly installed above the assembly seat 2. The shape of the assembly hole and the shape of the assembly screw head 4 are adapted to each other. The shapes of the hydraulic nut body 1 and the assembly screw head 4 are adapted to each other. A fixing mechanism is provided on the inner wall of the tightening seat 3 and the outer surface of the assembly screw head 4. The fixing mechanism is used to fix the tightening seat 3 and the assembly screw head 4 together. When using the hydraulic nut body 1, the operator aligns it with the mounting screw head 4 on the surface of the mounting base 2. Then, the tightening seat 3 on the surface of the hydraulic nut body 1 is screwed into the surface of the mounting screw head 4. With the fixing mechanism of the tightening seat 3 and the surface of the mounting screw head 4, the hydraulic nut body 1 can be firmly installed on the surface of the mounting base 2, avoiding the problem of welding the hydraulic nut to the surface of the mounting base 2 in the prior art. This facilitates the subsequent replacement of the hydraulic nut and reduces loosening under the high-frequency vibration of external equipment, making the hydraulic nut highly flexible and improving its practicality.

[0025] like Figures 2 to 7As shown, the fixing mechanism includes an embedded groove 5 formed in the wall of the mounting hole of the tightening seat 3. Multiple embedded grooves 5 are formed in a circumferential array within the mounting hole of the tightening seat 3. The fixing mechanism also includes multiple elastic clips 6 installed on the mounting screw head 4. The multiple elastic clips 6 and embedded grooves 5 are arranged in a one-to-one correspondence, and the shape of the elastic clips 6 matches the shape of the embedded grooves 5. During operation, as the hydraulic nut body 1 is gradually installed above the mounting seat 2, as the tightening seat 3 tightens towards the surface of the mounting screw head 4, until the tightening seat 3 is screwed into the entire surface of the mounting screw head 4, the elastic clips 6 on the surface of the mounting screw head 4 will engage in the embedded grooves 5 on the inner wall of the tightening seat 3. At this point, the hydraulic nut body 1 can be initially fixed, facilitating its subsequent use.

[0026] Each of the embedded grooves 5 has a through hole 7 in its groove wall. A telescopic seat 8 is fixedly installed on the outer surface of the elastic clip 6. An elastic embedded rod 9 is slidably installed inside the telescopic seat 8. The shape of the elastic embedded rod 9 matches the shape of the through hole 7. The through hole 7 extends into the interior of the tightening seat 3. Both the outer surfaces of the embedded grooves 5 and the elastic clip 6 are provided with arc-shaped chamfers. During operation, when the tightening seat 3 is slowly and completely screwed into the surface of the assembly screw head 4, the arc-shaped chamfer on the outer surface of the elastic collet 6 will contact the arc-shaped chamfer on the insert groove 5, causing the elastic collet 6 to slowly enter the insert groove 5. Moreover, the elastic insert rod 9 on the outer surface of the elastic collet 6 will contract under the pressure of the insert groove 5. When the elastic collet 6 is completely placed inside the insert groove 5, the elastic insert rod 9 will also align with the through hole 7. Therefore, the elastic insert rod 9 will no longer be under pressure and will extend into the interior of the through hole 7. At this time, the tightening seat 3 and the assembly screw head 4 can be further fixed, which improves the effect of reducing the loosening of the hydraulic nut under the high-frequency vibration of external equipment.

[0027] like Figures 3 to 9 As shown, a limiting spring 10 is sleeved on the outer surface of the elastic embedding rod 9, and a rectangular groove 801 is provided on the inner wall of the telescopic seat 8. A rectangular plate 901 is installed at the position corresponding to the elastic embedding rod 9 and the rectangular groove 801. The shape of the rectangular plate 901 is adapted to the shape of the rectangular groove 801, and the rectangular plate 901 is slidably installed in the rectangular groove 801. During operation, when the elastic embedding rod 9 is subjected to the pressure of the embedding groove 5, the elastic embedding rod 9 will drive the limiting spring 10 on its surface to contract, and the elastic embedding rod 9 will drive the rectangular plate 901 to move inside the rectangular groove 801. When the elastic embedding rod 9 is aligned with the through hole 7, under the elastic force recovery action of the limiting spring 10, the elastic embedding rod 9 will extend into the through hole 7. Moreover, under the mutual limiting of the rectangular plate 901 and the rectangular groove 801, it can be ensured that the elastic embedding rod 9 is on the same axis when moving, thereby facilitating the elastic embedding rod 9 to be inserted into the through hole 7.

[0028] A deflection seat 11 is fixedly installed on the outer surface of the elastic embedded rod 9. Two deflection seats 11 are provided and are symmetrically arranged with respect to the elastic embedded rod 9. A limit support plate 12 is rotatably installed on the outer surface of each deflection seat 11. The distance between adjacent limit support plates 12 is adapted to the shape of the through hole 7. A limit mechanism is provided on the surface of the limit support plate 12 to fix the limit support plate 12 to the outer surface of the tightening seat 3. The length of the elastic embedded rod 9 is adapted to the length of the through hole 7. During operation, when the elastic embedded rod 9 returns to its original position under the elastic force of the limit spring 10, the limit support plate 12 on the outer surface of the elastic embedded rod 9 will move simultaneously on the inner wall of the through hole 7, and the limit support plate 12 will be deflected by the pressure of the through hole 7. When the limit spring 10 fully returns to its original position, the limit support plate 12 will extend out of the through hole 7. Figure 7 and Figure 9 As shown, under the action of the limiting mechanism, the two limiting support plates 12 will be stuck on the outer surface of the tightening seat 3. This ensures the fixing effect of the hydraulic nut and avoids the problem of welding the hydraulic nut to the surface of the mounting seat 2 in the prior art. It also improves the service life of the hydraulic nut to a certain extent.

[0029] The limiting mechanism includes a telescopic spring 14 installed on the outer surface of the limiting support plate 12. The side of the telescopic spring 14 away from the limiting support plate 12 is fixedly installed on the surface of the deflection seat 11. The shape of the limiting support plate 12 at the contact position with the through hole 7 is arc-shaped. During operation, when the limiting support plate 12 moves in the inner wall of the through hole 7, the limiting support plate 12 will be pressed and squeeze the telescopic spring 14 on its side surface. When the limiting support plate 12 extends out of the through hole 7, under the elastic force of the telescopic spring 14, the two limiting support plates 12 can be expanded and wrapped around the outer surface of the tightening seat 3, thus improving the fixing effect between the two. When the hydraulic nut needs to be replaced after prolonged use, the operator only needs to manually pull the elastic insert rod 9 away from the through hole 7, so that the elastic insert rod 9 is a certain distance away from the through hole 7. Then press the limit support plates 12 on both sides, and then press the limit support plates 12 and the elastic insert rod 9 into the through hole 7 until the elastic insert rod 9 is placed in the insert groove 5. Then tighten the seat 3 in the opposite direction, and the hydraulic nut can be slowly removed. At this time, a new hydraulic nut can be replaced. This makes the device highly flexible, easy to operate, and more convenient to replace.

[0030] like Figures 8 to 10 As shown, a limiting post 15 is fixedly installed on the outer surface of the deflection seat 11. The side of the limiting post 15 away from the deflection seat 11 is in contact with the surface of the deflection seat 11. During operation, the limiting post 15 can limit the position of the limiting support plate 12, ensuring the wrapping effect of the adjacent limiting support plate 12 on the tightening seat 3.

[0031] Each of the limiting support plates 12 has a locking hole 16 on its outer surface. An assembly rod 17 is fixedly installed on the outer peripheral surface of the tightening seat 3 at the position corresponding to the locking hole 16. The shape of the assembly rod 17 is adapted to the shape of the locking hole 16. During operation, when the limiting support plate 12 is wrapped around the outer surface of the tightening seat 3, the assembly rod 17 on the surface of the tightening seat 3 will be locked into the locking hole 16, thereby further improving the fixing effect of the tightening seat 3 and enabling it to better adapt to different high-frequency vibrations.

[0032] like Figures 8 to 10 As shown, a ratchet plate 20 is rotatably mounted on the inner wall of the locking hole 16, and a ratchet plate 21 is fixedly mounted on the outer surface of the assembly rod 17. Multiple ratchet plates 20 and 21 are provided and arranged adjacent to each other. Both ratchet plates 20 and 21 are conical in shape and face opposite directions. During operation, when the assembly rod 17 is fully inserted into the locking hole 16, the ratchet plate 21 on the outer surface of the assembly rod 17 contacts the ratchet plate 20, causing the ratchet plate 20 to deflect under pressure. When each ratchet plate 21 engages with each ratchet plate 20, the ratchet plate 21 will engage with the ratchet plate 20. The mutual meshing of the ratchet plates 20 and 21 strengthens the fixing effect of the device. (Refer to the attached diagram.) Figure 10 As shown.

[0033] A spring is installed on one side of the ratchet plate 20, and the side of the spring away from the ratchet plate 20 is installed on the inner wall of the locking hole 16. The spring is designed to facilitate the subsequent locking of the ratchet plate 20 and the ratchet plate 21.

[0034] During operation, when using the hydraulic nut body 1, the operator aligns the hydraulic nut body 1 with the mounting screw head 4 on the surface of the mounting base 2, and then screws the tightening seat 3 on the surface of the hydraulic nut body 1 into the surface of the mounting screw head 4. Under the fixing mechanism of the tightening seat 3 and the surface of the mounting screw head 4, the hydraulic nut body 1 can be firmly installed on the surface of the mounting base 2, avoiding the problem of welding the hydraulic nut to the surface of the mounting base 2 in the prior art. This facilitates the subsequent replacement of the hydraulic nut, and also reduces loosening under the high-frequency vibration of external equipment, making the hydraulic nut highly flexible and improving its practicality. As the hydraulic nut body 1 is gradually installed on the mounting base 2, as the tightening seat 3 is tightened towards the surface of the mounting screw head 4, until the tightening seat 3 is screwed into the entire surface of the mounting screw head 4, the elastic clip 6 on the surface of the mounting screw head 4 will be locked into the embedded groove 5 on the inner wall of the tightening seat 3. At this time, the hydraulic nut body 1 can be initially fixed, facilitating its subsequent use. When the tightening seat 3 is slowly and completely screwed into the surface of the assembly screw head 4, the arc-shaped chamfer on the outer surface of the elastic collet 6 will contact the arc-shaped chamfer on the insert groove 5, allowing the elastic collet 6 to slowly enter the insert groove 5. The elastic insert rod 9 on the outer surface of the elastic collet 6 will contract under the pressure of the insert groove 5. When the elastic collet 6 is completely placed inside the insert groove 5, the elastic insert rod 9 will also align with the through hole 7. Therefore, the elastic insert rod 9 will no longer be under pressure and will extend into the through hole 7, further securing the tightening seat 3 and the assembly screw head 4. This improves the effect of reducing loosening of the hydraulic nut under high-frequency vibration of external equipment. When the elastic insert rod 9 is under the pressure of the insert groove 5, the elastic insert rod 9 will drive the limiting spring 1 on its surface. When the elastic rod 9 contracts, it causes the rectangular plate 901 to move inside the rectangular groove 801. When the elastic rod 9 aligns with the through hole 7, under the restoring force of the limiting spring 10, the elastic rod 9 extends into the through hole 7. Furthermore, the mutual limiting of the rectangular plate 901 and the rectangular groove 801 ensures that the elastic rod 9 moves on the same axis, thus facilitating its insertion into the through hole 7. When the elastic rod 9 recovers under the restoring force of the limiting spring 10, the limiting support plate 12 on the outer surface of the elastic rod 9 moves simultaneously within the inner wall of the through hole 7. The limiting support plate 12 is deflected by the pressure of the through hole 7. When the limiting spring 10 fully recovers, the limiting support plate 12 extends outward from the through hole 7. Figure 7 and Figure 9 As shown, under the action of the limiting mechanism, the two limiting support plates 12 will be stuck on the outer surface of the tightening seat 3. This ensures the fixing effect of the hydraulic nut and avoids the problem of welding the hydraulic nut to the surface of the mounting seat 2 in the prior art. It also improves the service life of the hydraulic nut to a certain extent. When the limiting support plate 12 moves within the inner wall of the through hole 7, the pressure on the limiting support plate 12 will compress the telescopic spring 14 on its side surface. When the limiting support plate 12 extends out of the through hole 7, under the recovery of the elastic force of the telescopic spring 14, the two limiting support plates 12 can be in an expanded state and wrapped around the outer surface of the tightening seat 3, thus improving the fixing effect between the two. When the hydraulic nut needs to be replaced after prolonged use, the operator simply needs to manually pull the elastic insert rod 9 away from the through hole 7, so that the elastic insert rod 9 is a certain distance away from the through hole 7. Then, press the limiting support plates 12 on both sides, and then press the limiting support plates 12 and the elastic insert rod 9 into the through hole 7 until the elastic insert rod 9 is placed inside the insert groove 5. At this point, tighten the seat 3 in the opposite direction, and the hydraulic nut can be slowly removed. Then, a new hydraulic nut can be replaced. This makes the device highly flexible, easy to operate, and convenient to replace. When the assembly rod 17 is fully inserted into the locking hole 16, the second ratchet plate 21 on the outer surface of the assembly rod 17 contacts the first ratchet plate 20. The first ratchet plate 20 will be deflected under pressure. When each second ratchet plate 21 engages with each first ratchet plate 20, the second ratchet plate 21 will respectively engage with the first ratchet plate 20. The mutual meshing of the first ratchet plate 20 and the second ratchet plate 21 strengthens the fixing effect of the device. (Refer to the attached diagram.) Figure 10 As shown.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic bolt tightening / loosening device, characterized in that: The device includes a hydraulic nut body (1) and an assembly seat (2). A tightening seat (3) is fixedly installed below the hydraulic nut body (1). An assembly hole is provided below the tightening seat (3). An assembly screw head (4) is fixedly installed above the assembly seat (2). The shape of the assembly hole matches the shape of the assembly screw head (4). The shapes of the hydraulic nut body (1) and the assembly screw head (4) match. A fixing mechanism is provided on the inner wall of the tightening seat (3) and the outer surface of the assembly screw head (4). The fixing mechanism is used to fix the tightening seat (3) and the assembly screw head (4) together. The fixing mechanism includes an embedding groove (5) formed in the wall of the mounting hole of the tightening seat (3). Multiple embedding grooves (5) are formed and arranged in a circumferential array in the mounting hole of the tightening seat (3). The fixing mechanism also includes multiple elastic clips (6) installed on the mounting screw head (4). The multiple elastic clips (6) and the embedding grooves (5) are arranged in a one-to-one correspondence. The shape of the elastic clips (6) is adapted to the shape of the embedding grooves (5). Each of the embedded slots (5) has a through hole (7) in its wall. A telescopic seat (8) is fixedly installed on the outer surface of the elastic clip (6). An elastic embedded rod (9) is slidably installed inside the telescopic seat (8). The shape of the elastic embedded rod (9) matches the shape of the through hole (7). The through hole (7) extends into the interior of the tightening seat (3). The outer surfaces of the embedded slots (5) and the elastic clips (6) are both provided with arc-shaped chamfers. A limit spring (10) is sleeved on the outer surface of the elastic embedded rod (9). A rectangular groove (801) is provided on the inner wall of the telescopic seat (8). A rectangular plate (901) is installed at the position corresponding to the elastic embedded rod (9) and the rectangular groove (801). The shape of the rectangular plate (901) matches the shape of the rectangular groove (801). The rectangular plate (901) is slidably installed in the rectangular groove (801). A deflection seat (11) is fixedly installed on the outer surface of the elastic embedded rod (9). Two deflection seats (11) are provided and are symmetrically arranged relative to the elastic embedded rod (9). A limit support plate (12) is rotatably installed on the outer surface of each deflection seat (11). The distance between adjacent limit support plates (12) is adapted to the shape of the through hole (7). A limit mechanism is provided on the surface of the limit support plate (12). The limit mechanism is used to fix the limit support plate (12) on the outer surface of the tightening seat (3). The length of the elastic embedded rod (9) is adapted to the length of the through hole (7).

2. The hydraulic bolt tightening device according to claim 1, characterized in that: The limiting mechanism includes a telescopic spring (14) installed on the outer surface of the limiting support plate (12). The side of the telescopic spring (14) away from the limiting support plate (12) is fixedly installed on the surface of the deflection seat (11). The shape of the limiting support plate (12) at the contact position with the through hole (7) is arc-shaped.

3. The hydraulic bolt tightening device according to claim 2, characterized in that: A limiting post (15) is fixedly installed on the outer surface of the deflection seat (11), and the side of the limiting post (15) away from the deflection seat (11) is in contact with the surface of the deflection seat (11).

4. A hydraulic bolt tightening device according to claim 2, characterized in that: Each of the limiting support plates (12) has a locking hole (16) on its outer surface. An assembly rod (17) is fixedly installed on the outer circumference of the tightening seat (3) at the position corresponding to the locking hole (16). The shape of the assembly rod (17) is adapted to the shape of the locking hole (16).

5. A hydraulic bolt tightening device according to claim 4, characterized in that: The inner wall of the jack hole (16) is rotatably mounted with a ratchet plate one (20), and the outer surface of the assembly rod (17) is fixedly mounted with a ratchet plate two (21). Multiple ratchet plates one (20) and ratchet plates two (21) are provided and are arranged adjacent to each other. Both ratchet plates one (20) and ratchet plates two (21) are conical in shape and face opposite directions.

6. A hydraulic bolt tightening device according to claim 5, characterized in that: A spring is installed on one side of the ratchet plate (20), and the side of the spring away from the ratchet plate (20) is installed on the inner wall of the slot (16).

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