Hydraulic screw stretching device

Abstract

The application relates to the technical field of screw stretching devices, in particular to a hydraulic screw stretching device, which comprises a mounting frame, the inside of the mounting frame is provided with a bridge, a sleeve is rotationally and claspingly installed on the bottom end inner wall of the bridge, a pull rod is arranged on one side of the top end of the bridge, and a liquid injection cavity is embeddedly arranged on the top end inner wall of the bridge. The hydraulic screw stretching device is provided with the mounting frame and the moving wheel, and the screw rod, the auxiliary rod and the limiting block are positioned, so that the stretching device can be randomly pushed and shifted during on-site operation, the bridge and the sleeve can automatically sleeve and automatically rotate and tighten the nut needing to be tightened during use, the pull rod on the top can be automatically rotated into the top of the bolt needing to be stretched, the whole device does not need to be manually carried, shifted, sleeved and wiped during actual use, the whole device is more flexible, the stretching and tightening efficiency is improved, and the working pressure of the operator is reduced.

Description

Technical Field

[0001] This invention relates to the field of screw tensioning equipment technology, specifically a hydraulic screw tensioning device. Background Technology

[0002] A bolt tensioner is a device that uses a hydraulic booster pump to provide a hydraulic power source. The tension force is determined based on the tensile strength, yield coefficient, and elongation of the material. The tension generated by the ultra-high pressure oil pump causes the bolt to be stretched within its elastic deformation zone, resulting in a slight deformation of the bolt diameter, which makes it easier to loosen or tighten the nut.

[0003] Announcement No. CN111408931B discloses a hydraulic bolt tensioner. Through a structural design of six limiting wedges and a pull rod within a pull ring sleeve, the tensioner utilizes the force transmission of these wedges and the pull rod to easily pull the bolt upwards at the second nut. This reduces the length of the bolt being stretched, ensuring a sufficiently large proportion of the bolt being stretched at the first nut, thus increasing the effective utilization rate of the stretched bolt and improving work efficiency. Furthermore, by stretching the bolt using a second nut that is compatible with the bolt, and with a sufficient number and readily available second nuts, there is no need to manufacture matching nut sleeves for bolts of different sizes. This improves the ease of use of the bolt tensioner and eliminates the need for targeted replacement of damaged nut sleeves, saving on subsequent costs.

[0004] When assembling the spiral casing of a water pump turbine unit, a bolt tensioning device is needed to stretch multiple bolts before tightening the nuts to ensure the stability of the spiral casing installation. However, existing bolt tensioners require manual handling, relocation, and installation during on-site construction, which is cumbersome, increases the workload of operators, and reduces the overall assembly efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic screw tensioning device to solve the problem mentioned in the background art that existing bolt tensioners require manual handling, relocation, and installation during on-site construction, which is cumbersome, increases the workload of operators, and reduces the overall assembly efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic screw tensioning device, comprising a mounting frame, a bridge frame disposed inside the mounting frame, a sleeve rotatably engaged on the inner wall of the bottom end of the bridge frame, a pull rod disposed on one side of the top end of the bridge frame, an injection chamber embedded in the inner wall of the top end of the bridge frame, a hydraulic pump fixed to the outside of one side of the bridge frame, and the output end of the hydraulic pump being installed inside the bottom end of the injection chamber through a conduit, an abutment block being slidably sealed at the top end of the injection chamber, a movable tensioning mechanism disposed inside one side of the mounting frame, a center positioning mechanism disposed outside the bottom end of the bridge frame, and a cleaning mechanism disposed outside the bottom end of the mounting frame.

[0007] Furthermore, the movable tensioning mechanism includes movable wheels, a threaded rod, an auxiliary rod, a stepper motor, and a limiting block. Movable wheels are installed at the bottom corners of the mounting frame. A threaded rod is rotatably mounted on one side of the mounting frame, and an auxiliary rod is fixed longitudinally on the other side of the mounting frame. A limiting block is threadedly mounted through one side of the threaded rod, and a limiting block is also slidably mounted through one side of the auxiliary rod. One end of each limiting block is fixedly mounted to the outside of one side of the sleeve. A stepper motor is fixed to one side of the bottom of the mounting frame, and the output end of the stepper motor is coaxially fixed to one end of the threaded rod.

[0008] Furthermore, the movable tensioning mechanism also includes an electric telescopic rod, a limiting ring, a gear ring I, a stepper motor II, and a gear I. The electric telescopic rod is longitudinally fixed inside each of the limiting blocks. The limiting ring is fixed between the top ends of the output ends of the electric telescopic rod. One side of the top end of the pull rod is rotatably engaged inside one side of the limiting ring. The gear ring I is fixed through the outside of the top end of the pull rod. The stepper motor II is fixed outside one side of the limiting ring, and the output end of the stepper motor II is fixed with gear I. One side of gear I meshes with one side of gear ring I.

[0009] Furthermore, the movable stretching mechanism also includes a second gear ring, a first drive motor, and a second gear. The second gear ring is embedded and surrounded on the outer surface of the sleeve. The first drive motor is fixed to the outside of one side of the bridge frame, and the output end of the first drive motor is fixed to the second gear. One side of the second gear meshes with one side of the second gear ring.

[0010] Furthermore, the center positioning mechanism includes an abutment cover and an abutment plate. A semi-circular abutment cover is provided on one side of the bottom end of the cable tray, and a semi-circular abutment plate is fixed at the bottom edge of the abutment cover. The center points of the abutment cover, the cable tray, and the tie rod are on the same vertical line.

[0011] Furthermore, the central positioning mechanism also includes a connecting rod, a through groove, and a worm gear. The top of the contact cover is provided with a connecting rod, and the end of the connecting rod away from the contact cover is fixed with a worm gear. The mounting bracket is provided with a through groove on the side near the connecting rod.

[0012] Furthermore, the central positioning mechanism also includes a worm gear, a connecting gear, and a limiting rack. A through groove is provided on the side of the mounting bracket near the connecting rod. The worm gear is rotatably mounted on the inner wall of the through groove near the top. A worm gear is meshed at the top of the worm gear, and the worm gear is rotatably mounted on the outside of one side of the mounting bracket via a bracket. A connecting gear is fixed to one end of the worm gear. A limiting rack is fixed to the outside of one side of the bridge frame, and one side of the limiting rack is meshed with one side of the connecting gear.

[0013] Furthermore, the cleaning mechanism includes a second drive motor, a sweeping brush, and an iron scraper plate. The second drive motor is fixed to the side of the connecting rod near the top of the contact cover, and the output end of the second drive motor is fixed to the center of the top of the contact cover. Several sweeping brushes are fixed around the inner wall of the contact plate at equal angles, and an iron scraper plate is slidably installed through the top of the contact plate.

[0014] Furthermore, the cleaning mechanism also includes a limiting rod and a compression spring. The limiting rod is longitudinally fixed on the side of the contact plate away from the brush. The iron scraper plate is slidably mounted on the side of the limiting rod. A compression spring is sleeved on the side of the limiting rod, and the two ends of the compression spring are respectively mounted on the side of the iron scraper plate and the limiting rod.

[0015] Furthermore, the cleaning mechanism also includes a collection box and a limiting magnet. The collection box is fixed on the side of the mounting bracket near the bottom of the through groove, and the limiting magnet is fixed at an external angle on the top of the side of the collection box away from the iron scraper plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting up the mounting frame and moving wheels, and positioning the threaded rod, auxiliary rod and limiting block, this tensioning device can be pushed and moved freely during on-site operation. At the same time, it can automatically put the bridge and sleeve onto the nuts to be tightened and automatically rotate and tighten them. It can also automatically screw the top tie rod into the top of the bolt to be tensioned. Therefore, the whole device does not require manual handling, movement and fitting operations during actual use. It is more flexible, improves the overall tensioning and tightening efficiency, and reduces the workload of operators.

[0018] 2. The semi-circular abutment cover and abutment plate at the bottom of the mounting bracket allow for easy centering when relocating the device. Simply place the abutment plate against one side of the bolt to be stretched to determine the center position, ensuring that the center of the subsequent sleeve and tie rod is on the same center line as the bolt. This guarantees alignment during subsequent lowering and tightening, ensuring overall positioning accuracy. No manual relocation or alignment is required, making the device more convenient and improving the efficiency of alignment and stretching operations. After alignment, as the cable tray descends, the worm gear, worm, connecting gear, and limiting rack drive the connecting rod, abutment cover, and abutment plate to rotate synchronously at a certain angle. This causes the abutment cover and abutment plate to rotate away from the bottom of the sleeve, preventing collision with the descending sleeve and allowing for automatic retraction. After the subsequent stretching and tightening operation, the sleeve will rotate and reset synchronously when it returns to its original position, ensuring the accuracy of alignment when moving the device to align other screws. This results in better overall performance.

[0019] 3. By installing several brushes around the inner wall of the contact plate and setting up a second drive motor, when the contact plate comes into contact with the outer wall of the bolt to be stretched, the second drive motor drives the contact cover, contact plate, and brushes to rotate. This brushes clean the thread grooves on the outer wall of the bolt, preventing impurities from adhering to the inner wall of the threads and affecting the normal screwing in of the subsequent tie rod. This ensures that the tie rod and bolt can rotate and tighten smoothly, reducing wear. At the same time, when the bridge frame descends, the connecting rod drives the contact cover and contact plate to rotate and shift by a certain angle. At this time, one side of the bottom of the contact plate will align with one side of the limiting magnet. The attraction force of the limiting magnet will attract and move the iron scraper plate at the top of the contact plate. The movement of the iron scraper plate will sweep off the impurities adhering and stuck in the brushes and scrape them into the collection box at the bottom, ensuring the cleanliness of the brushes and ensuring their continuous use. Overall, it is more convenient to use and has a better cleaning effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the screw tensioning device of the present invention;

[0021] Figure 2 This is a cross-sectional perspective view of the installation structure of the cable tray and sleeve of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the movable stretching mechanism and mounting frame of the present invention;

[0023] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the central positioning mechanism and mounting frame of the present invention;

[0024] Figure 5 For the present invention Figure 4 A magnified structural diagram of section A;

[0025] Figure 6 This is a schematic diagram demonstrating the contact between the contact plate and the screw to be stretched according to the present invention.

[0026] Figure 7 This is a three-dimensional structural diagram of the cleaning mechanism and mounting frame of the present invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the iron scraper toothed plate and the limiting rod of the present invention.

[0028] Figure 9 This is a schematic diagram demonstrating the rotation of the contact plate and the alignment of the limiting magnet in this invention.

[0029] In the diagram: 1. Mounting bracket; 2. Cable tray; 3. Sleeve; 4. Tie rod; 5. Injection chamber; 6. Hydraulic pump; 7. Contact block; 8. Moving tensioning mechanism; 801. Moving wheel; 802. Threaded rod; 803. Auxiliary rod; 804. Stepper motor one; 805. Limit block; 806. Electric telescopic rod; 807. Limit ring; 808. Gear ring one; 809. Stepper motor two; 8010. Gear one; 8011. Gear ring two; 8012. Drive motor one ; 8013, Gear II; 9, Center Positioning Mechanism; 901, Contact Cover; 902, Contact Plate; 903, Connecting Rod; 904, Through Groove; 905, Worm Gear; 906, Worm; 907, Connecting Gear; 908, Limiting Rack; 10, Cleaning Mechanism; 1001, Drive Motor II; 1002, Sweeping Brush; 1003, Iron Scraper Plate; 1004, Limiting Rod; 1005, Compression Spring; 1006, Collection Box; 1007, Limiting Magnet. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-9This invention provides a technical solution: a hydraulic screw tensioning device, including a mounting frame 1, a bridge frame 2 inside the mounting frame 1, a sleeve 3 rotatably engaged on the inner wall of the bottom end of the bridge frame 2, a pull rod 4 on one side of the top end of the bridge frame 2, an injection chamber 5 embedded in the inner wall of the top end of the bridge frame 2, a hydraulic pump 6 fixed to the outside of one side of the bridge frame 2, and the output end of the hydraulic pump 6 being installed inside the bottom end of the injection chamber 5 through a conduit, a sliding sealing contact block 7 being installed at the top end of the injection chamber 5, a movable tensioning mechanism 8 located inside one side of the mounting frame 1, a center positioning mechanism 9 located outside the bottom end of the bridge frame 2, and a cleaning mechanism 10 located outside the bottom end of the mounting frame 1.

[0032] In practical use, the hydraulic screw tensioning device provided in this solution is first moved to one side of one of the bolts to be tensioned on the water pump turbine unit. During the movement, the center positioning mechanism 9 ensures that the center of the subsequent sleeve 3 and tie rod 4 is on the same center line as the center of the bolt to be tensioned, ensuring alignment during the subsequent lowering and tightening, and guaranteeing overall alignment accuracy. No manual movement or alignment is required. After alignment, the cleaning mechanism 10 cleans the thread grooves on the outer wall of the bolt to be tensioned, preventing impurities from adhering to the inner wall of the thread and affecting the normal screwing of the tie rod 4. This ensures that the tie rod 4 and the bolt can rotate and tighten smoothly, reducing wear. After cleaning, the operation of some components inside the moving tensioning mechanism 8 is activated to automatically tension and tighten the bolt. The overall tensioning and tightening efficiency is high, improving the overall assembly efficiency.

[0033] In some embodiments, the movable tensioning mechanism 8 includes a movable wheel 801, a threaded rod 802, an auxiliary rod 803, a stepper motor 804, and a limiting block 805. The movable wheel 801 is installed at the bottom corner of the mounting frame 1. The threaded rod 802 is rotatably mounted on one side of the mounting frame 1, and the auxiliary rod 803 is fixed longitudinally on the other side of the mounting frame 1. The limiting block 805 is threadedly installed through one side of the threaded rod 802, and the limiting block 805 is also slidably installed through one side of the auxiliary rod 803. One end of each limiting block 805 is fixedly mounted to one side of the sleeve 3. The stepper motor 804 is fixed to one side of the bottom of the mounting frame 1, and the output end of the stepper motor 804 is coaxially fixed to one end of the threaded rod 802.

[0034] Combination Figure 1 and Figure 3As shown, when in use, the device is first moved to one side of one of the bolts to be stretched on the water pump turbine unit. The cable tray 2, sleeve 3 and tie rod 4 are limited and fixed by the mounting frame 1 and the multiple moving wheels 801 at the bottom of the mounting frame 1 make the stretching device more convenient to use in actual use. There is no need for manual handling and alignment. The efficiency is higher when stretching multiple bolts, and the workload of the staff is reduced.

[0035] In some embodiments, the center positioning mechanism 9 includes an abutment cover 901 and an abutment plate 902. A semi-circular abutment cover 901 is provided on one side of the bottom end of the cable tray 2, and a semi-circular abutment plate 902 is fixed at the bottom edge of the abutment cover 901. The center points of the abutment cover 901, the cable tray 2, and the pull rod 4 are on the same vertical line. The center positioning mechanism 9 also includes a connecting rod 903, a through groove 904, and a worm gear 905. A connecting rod 903 is provided at the top end of the abutment cover 901, and a worm gear 905 is fixed at the end of the connecting rod 903 away from the abutment cover 901. A through groove 904 is provided through the side of the mounting bracket 1 near the connecting rod 903.

[0036] Combination Figure 4 and Figure 6 As shown, the semi-circular abutment cover 901 and abutment plate 902 at the bottom of the mounting bracket 1 allow the device to be moved and used by simply placing the abutment plate 902 against one side of the bolt to be stretched to determine the center position. This ensures that the center of the sleeve 3 and the tie rod 4 are on the same center line as the center of the bolt to be stretched, guaranteeing alignment during subsequent lowering and screwing in, ensuring overall alignment accuracy, eliminating the need for manual movement and alignment, making the overall use more convenient, and improving the efficiency of alignment and stretching operations.

[0037] In some embodiments, the cleaning mechanism 10 includes a second drive motor 1001, a brush 1002, and an iron scraper 1003. The second drive motor 1001 is fixed to the side of the connecting rod 903 near the top of the contact cover 901, and the output end of the second drive motor 1001 is fixed to the center of the top of the contact cover 901. Several brushes 1002 are fixed around the inner wall of the contact plate 902 at equal angles, and the iron scraper 1003 is slidably installed through the top of the contact plate 902.

[0038] Combination Figure 7As shown, after the center position of the contact plate 902 and the bolt is established, the second drive motor 1001 on the bottom side can be started. The rotation of the output shaft of the second drive motor 1001 will drive the contact cover 901 and the contact plate 902 installed at the bottom to rotate. This will cause the multiple brushes 1002 inside the contact plate 902 to rotate against the outside of the bolt, thereby brushing and cleaning the thread groove on the outer wall of the bolt to be stretched. This will prevent impurities from adhering to the inner wall of the thread, which would affect the normal screwing in of the tie rod 4. This will ensure that the tie rod 4 and the bolt can rotate and tighten smoothly, reducing wear.

[0039] In some embodiments, the center positioning mechanism 9 further includes a worm 906, a connecting gear 907, and a limiting rack 908. A through groove 904 is provided through the side of the mounting bracket 1 near the connecting rod 903. A worm wheel 905 is rotatably mounted on the inner wall of the through groove 904 near the top. The top of the worm wheel 905 is meshed with the worm 906, and the worm 906 is rotatably mounted on the outside of one side of the mounting bracket 1 via a bracket. A connecting gear 907 is fixed to one end of the worm 906. A limiting rack 908 is fixed to the outside of one side of the bridge frame 2, and one side of the limiting rack 908 is meshed with one side of the connecting gear 907.

[0040] Combination Figure 4 , Figure 5 and Figure 6 As shown, after the contact plate 902 is aligned with the bolt to establish its center position and the thread groove on the outer wall of the bolt is cleaned, the stepper motor 804 on one side is started. The rotation of the output shaft of the stepper motor 804 drives the threaded rod 802 to rotate. At the same time, with the limiting of the auxiliary rod 803 and the installation of the limiting block 805, the bridge frame 2 and the sleeve 3 begin to descend. When the bridge frame 2 and sleeve 3 descend, the limiting rack 908 on one side will descend synchronously. The movement of the limiting rack 908 drives the meshing connecting gear 907 on one side to rotate. The rotation of the connecting gear 907... This drives the worm gear 906 to rotate, which in turn drives the worm wheel 905 and the connecting rod 903 connected to its bottom to rotate. This causes the contact cover 901 and the contact plate 902 to rotate synchronously at a certain angle, thus moving the contact cover 901 and the contact plate 902 away from the bottom of the sleeve 3. This prevents them from colliding with the descending sleeve 3 and allows them to retract automatically. After the subsequent stretching and tightening operation is completed, when the sleeve 3 rises back to its original position, it will drive the contact cover 901 and the contact plate 902 to rotate synchronously and reset. This ensures that when the device is moved to align with other screws, the alignment accuracy can still be guaranteed, resulting in better overall performance.

[0041] When the bridge frame 2 drives the limiting rack 908 to descend a certain distance, the contact cover 901 and the contact plate 902 have rotated away from the bottom of the sleeve 3. Then the bridge frame 2 continues to descend, and the limiting rack 908 disengages from the connecting gear 907. At this time, through the self-locking performance of the worm 906 and the worm wheel 905, the contact cover 901 and the contact plate 902 will not rotate back to their original position after the limiting rack 908 disengages from the connecting gear 907, so as to ensure the stability after rotation and ensure the overall operational stability.

[0042] In some embodiments, the movable tensioning mechanism 8 further includes an electric telescopic rod 806, a limiting ring 807, a gear ring 808, a stepper motor 809, and a gear 8010. The electric telescopic rod 806 is longitudinally fixed through the interior of each limiting block 805. A limiting ring 807 is fixed between the top ends of the output ends of the electric telescopic rod 806. One side of the top end of the pull rod 4 is rotatably engaged inside one side of the limiting ring 807. A gear ring 808 is fixed through the outside of the top end of the pull rod 4. A stepper motor 809 is fixed to the outside of one side of the limiting ring 807. The output end of the stepper motor 809 is fixed with a gear 8010, and one side of the gear 8010 is meshed with one side of the gear ring 808. The moving tensioning mechanism 8 also includes a gear ring 8011, a drive motor 8012, and a gear 8013. The gear ring 8011 is embedded and surrounded on the outer surface of the sleeve 3. The drive motor 8012 is fixed to one side of the bridge 2, and the output end of the drive motor 8012 is fixed with a gear 8013, and one side of the gear 8013 is meshed with one side of the gear ring 8011.

[0043] Combination Figure 1 , Figure 2 and Figure 3 As shown, when the cable tray 2 and sleeve 3 descend to the bottom, sleeve 3 engages with the nut cover on the outside of the bolt. Then, stepper motor 804 stops running, and stepper motor 809 at the top starts, which drives gear 8010 to rotate. The rotation of gear 8010 drives the gear ring 808 on one side to rotate, which in turn drives the pull rod 4 to start rotating. At the same time, the electric telescopic rod 806 is started to retract, so that the pull rod 4 rotates and descends to be threaded and fixed to the top of the screw. At the same time, the bottom wall of one side of the top of the pull rod 4 is in contact with the top of the contact block 7. At this time, the electric telescopic rod 806 and stepper motor 804 are turned off.

[0044] Then, the hydraulic pump 6 is started to pressurize and inject liquid into the injection chamber 5, which causes the contact block 7 to rise and abut against the pull rod 4. The rise and movement of the pull rod 4 causes the bottom bolt to be stretched to a certain height. Then, the drive motor 8012 is started to drive the gear 8013 to rotate, which in turn drives the external meshing gear ring 8011 to rotate, thereby driving the sleeve 3 to rotate, thus tightening the nut on the outside of the bolt. Finally, the bolt stretching and tightening operation is completed.

[0045] In some embodiments, the cleaning mechanism 10 further includes a limiting rod 1004 and a compression spring 1005. The limiting rod 1004 is longitudinally fixed to the outer side of the contact plate 902 away from the brush 1002. The iron scraper plate 1003 is slidably mounted on the outer side of the limiting rod 1004 through one side. The compression spring 1005 is sleeved and mounted through the outer side of the limiting rod 1004, and the two ends of the compression spring 1005 are respectively mounted on the outer side of the iron scraper plate 1003 and the limiting rod 1004. The cleaning mechanism 10 also includes a collection box 1006 and a limiting magnet 1007. The collection box 1006 is fixed to the bottom end of the mounting bracket 1 near the through groove 904, and the limiting magnet 1007 is inclinedly fixed to the outer top of the collection box 1006 away from the iron scraper plate 1003.

[0046] Combination Figure 7 , Figure 8 and Figure 9 As shown, when the cable tray 2 descends, the connecting rod 903 drives the contact cover 901 and the contact plate 902 to rotate and shift by a certain angle. At this time, one side of the bottom of the contact plate 902 will align with the limiting magnet 1007 on one side. Through the attraction force of the limiting magnet 1007, the iron scraper plate 1003 at the top of the contact plate 902 will be attracted and moved. Through the movement of the iron scraper plate 1003, the impurities adhering and stuck in the brush 1002 will be swept off and scraped into the collection box 1006 at the bottom, ensuring the smooth operation of the brush. The cleanliness of 1002 ensures the sustainable use of the sweeping brush 1002, making it more convenient to use and providing better cleaning results. When the connecting rod 903 drives the contact cover 901 and the contact plate 902 to rotate and reset, if the limiting magnet 1007 and the iron scraper plate 1003 are not aligned, the iron scraper plate 1003 will simultaneously rebound and reset to the top of the contact plate 902 through the rebound of the compression spring 1005 and the guidance of the limiting rod 1004, ensuring subsequent secondary use and good overall performance.

[0047] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic screw tensioning device, comprising a mounting bracket (1), characterized in that: The mounting bracket (1) is provided with a cable tray (2) inside. A sleeve (3) is rotatably engaged on the inner wall of the bottom end of the cable tray (2). A pull rod (4) is provided on one side of the top end of the cable tray (2). An injection chamber (5) is embedded in the inner wall of the top end of the cable tray (2). A hydraulic pump (6) is fixed on the outside of one side of the cable tray (2). The output end of the hydraulic pump (6) is installed inside the bottom end of the injection chamber (5) through a conduit. An abutment block (7) is slidably sealed at the top end of the injection chamber (5). The movable tensioning mechanism (8) is located inside one side of the mounting frame (1); A central positioning mechanism (9) is located on the outside of the bottom side of the cable tray (2); Cleaning mechanism (10), the cleaning mechanism (10) is located on the outside of the bottom side of the mounting frame (1); The movable tensioning mechanism (8) includes a movable wheel (801), a threaded rod (802), an auxiliary rod (803), a stepper motor (804), and a limiting block (805). The movable wheel (801) is installed at the bottom corner of the mounting frame (1). The threaded rod (802) is rotatably installed on one side of the mounting frame (1), and the auxiliary rod (803) is fixed longitudinally on the other side of the mounting frame (1). The limiting block (805) is threaded through the outside of one side of the threaded rod (802), and the limiting block (805) is also slidably installed through the outside of one side of the auxiliary rod (803). One end of each limiting block (805) is fixed to the outside of one side of the sleeve (3). The stepper motor (804) is fixed on one side of the bottom of the mounting frame (1), and the output end of the stepper motor (804) is coaxially fixed to one end of the threaded rod (802). The movable tensioning mechanism (8) further includes an electric telescopic rod (806), a limiting ring (807), a gear ring (808), a stepper motor (809), and a gear (8010). The electric telescopic rod (806) is longitudinally fixed inside the limiting block (805). The limiting ring (807) is fixed between the top ends of the output end of the electric telescopic rod (806). The top end of the pull rod (4) is rotated and engaged inside one side of the limiting ring (807). The top end of the pull rod (4) is fixed outside the gear ring (808). The stepper motor (809) is fixed outside one side of the limiting ring (807). The output end of the stepper motor (809) is fixed with a gear (8010). One side of the gear (8010) meshes with one side of the gear ring (808). The center positioning mechanism (9) includes a contact cover (901) and a contact plate (902). A semi-circular contact cover (901) is provided on one side of the bottom end of the cable tray (2), and a semi-circular contact plate (902) is fixed at the bottom edge of the contact cover (901). The center points of the contact cover (901), the cable tray (2) and the pull rod (4) are on the same vertical line. The central positioning mechanism (9) also includes a connecting rod (903), a through groove (904) and a worm gear (905). The top of the contact cover (901) is provided with a connecting rod (903). The end of the connecting rod (903) away from the contact cover (901) is fixed with a worm gear (905). The mounting bracket (1) is provided with a through groove (904) on the side near the connecting rod (903). The cleaning mechanism (10) includes a second drive motor (1001), a brush (1002), and an iron scraper (1003). The second drive motor (1001) is fixed on the side of the connecting rod (903) near the top of the contact cover (901), and the output end of the second drive motor (1001) is fixed at the center of the top of the contact cover (901). Several brushes (1002) are fixed around the inner wall of the contact plate (902) at equal angles. An iron scraper (1003) is slidably installed through one side of the top of the contact plate (902).

2. The hydraulic screw tensioning device according to claim 1, characterized in that: The movable tensioning mechanism (8) further includes a second gear ring (8011), a first drive motor (8012), and a second gear (8013). The second gear ring (8011) is embedded and surrounded on the outer surface of the sleeve (3). The first drive motor (8012) is fixed to the outside of one side of the bridge frame (2), and the output end of the first drive motor (8012) is fixed to the second gear (8013). One side of the second gear (8013) is meshed with one side of the second gear ring (8011).

3. The hydraulic screw tensioning device according to claim 1, characterized in that: The central positioning mechanism (9) further includes a worm (906), a connecting gear (907), and a limiting rack (908). The mounting bracket (1) has a through groove (904) on the side near the connecting rod (903). The worm wheel (905) is rotatably mounted on the inner wall of the through groove (904) near the top. The top of the worm wheel (905) is meshed with the worm (906), and the worm (906) is rotatably mounted on the outside of one side of the mounting bracket (1) through a bracket. One end of the worm (906) is fixed with the connecting gear (907). The limiting rack (908) is fixed on the outside of one side of the bridge frame (2), and one side of the limiting rack (908) is meshed with one side of the connecting gear (907).

4. The hydraulic screw tensioning device according to claim 1, characterized in that: The cleaning mechanism (10) also includes a limiting rod (1004) and a compression spring (1005). The limiting rod (1004) is longitudinally fixed on the side of the contact plate (902) away from the brush (1002). The iron scraper plate (1003) is slidably mounted on the side of the limiting rod (1004) through one side. The compression spring (1005) is sleeved on the side of the limiting rod (1004) through one side. The two ends of the compression spring (1005) are respectively mounted on the side of the iron scraper plate (1003) and the limiting rod (1004).

5. The hydraulic screw tensioning device according to claim 1, characterized in that: The cleaning mechanism (10) also includes a collection box (1006) and a limiting magnet (1007). The collection box (1006) is fixed on the bottom side of the mounting bracket (1) near the through groove (904), and the limiting magnet (1007) is fixed on the top side of the collection box (1006) away from the iron scraper plate (1003) at an angle.

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