Hydraulic screw stretching device

Abstract

The invention relates to the technical field of screw stretching equipment, in particular to a hydraulic screw stretching device which comprises a mounting frame, a bridge frame is arranged in the mounting frame, a sleeve is rotationally mounted on the inner wall of the bottom end of the bridge frame in a clamped mode, a pull rod is arranged on one side of the top end of the bridge frame, and a liquid injection cavity is formed in the inner wall of the top end of the bridge frame in an embedded mode. According to the hydraulic screw stretching device, through the arrangement of the mounting frame and the moving wheels and the positioning of the threaded rod, the auxiliary rod and the limiting block, the stretching device can be freely pushed and moved during field operation, and meanwhile, when the hydraulic screw stretching device is used, a nut needing to be tightened can be automatically sleeved with a bridge frame and a sleeve and automatically rotated and tightened; and meanwhile, the pull rod at the top can be automatically screwed into the top of the to-be-stretched bolt, so that manual carrying, shifting, sleeving and wiping operation is not needed in the whole actual use process, the overall flexibility is higher, the overall stretching and tightening efficiency is improved, and the working pressure of operators is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of screw rod stretching equipment, in particular to a hydraulic screw rod stretching device. Background Art

[0002] A bolt tensioner is a hydraulic source provided by a hydraulic booster pump. The tensile force is determined according to the tensile strength, yield coefficient and elongation of the material. The tensile force generated by the ultra-high pressure oil pump is used to stretch the bolt to which force is applied within its elastic deformation zone, causing the bolt diameter to deform slightly, making it easier to loosen or tighten the nut.

[0003] Announcement No. CN111408931B shows a hydraulic bolt tensioner, which uses the structural design of six limiting wedge blocks and a pull rod in a pull ring sleeve, and utilizes the force transmission of the limiting wedge blocks and the pull rod to facilitate the upward stretching of the bolt at the second nut, thereby reducing the length of the stretched bolt, so that the stretched portion of the bolt at the first nut accounts for a sufficiently large proportion, the effective utilization rate of the stretched bolt is improved, and thus the work efficiency is improved. At the same time, by stretching the bolt through the second nut that matches the bolt, the number of second nuts is sufficient and easy to obtain, and there is no need to make matching nut sleeves for bolts of different sizes, which improves the convenience of using the bolt tensioner, and there is no need to replace the nut sleeve in a targeted manner due to damage, saving later costs.

[0004] When assembling the volute of a pump-turbine unit, a bolt tensioning device is required to stretch multiple bolts before tightening the nuts to ensure the stability of the volute installation in the later stage. However, the existing bolt tensioners need to be manually moved, shifted and installed during on-site construction. The entire operation process is relatively cumbersome, which increases the work pressure of the operators and reduces the overall assembly work efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a hydraulic screw tensioning device to solve the problem that the existing bolt tensioner proposed in the above background technology needs to be manually moved, shifted and installed during on-site construction, and the whole operation process is relatively cumbersome, which increases the work pressure of the operator and reduces the overall assembly work efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic screw stretching device, comprising a mounting frame, a bridge frame is arranged inside the mounting frame, a sleeve is rotatably mounted on the inner wall of the bottom end of the bridge frame, a pull rod is arranged on the top side of the bridge frame, a liquid injection cavity is embedded on the inner wall of the top end of the bridge frame, a hydraulic pump is fixed to the outside of one side of the bridge frame, and the output end of the hydraulic pump is installed inside the bottom side of the liquid injection cavity through a conduit, a resistance block is installed on the top sliding seal of the liquid injection cavity, a movable stretching mechanism, the movable stretching mechanism is arranged inside one side of the mounting frame; a center positioning mechanism, the center positioning mechanism is arranged outside the bottom side of the bridge frame; a cleaning mechanism, the cleaning mechanism is arranged outside the bottom side of the mounting frame.

[0007] Furthermore, the movable stretching mechanism includes a movable wheel, a threaded rod, an auxiliary rod, a stepper motor and a limit block. The movable wheels are installed at the bottom corners of the mounting frame. A threaded rod is longitudinally rotatably installed on one side of the mounting frame, and an auxiliary rod is longitudinally fixed on the other side of the mounting frame. A threaded limit block is passed through the outside of one side of the threaded rod, and a sliding limit block is also passed through the outside of one side of the auxiliary rod, and one end of the two limit blocks are fixed to the outside of one side of the sleeve, and a stepper motor is fixed to one side of the bottom end 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 mobile stretching mechanism also includes an electric telescopic rod, a limit ring, a gear ring 1, a stepper motor 2 and a gear 1. The electric telescopic rod is longitudinally penetrated and fixed inside the limit block, and a limit 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 penetrated and rotatably engaged and installed inside one side of the limit ring. A gear ring 1 is penetrated and fixed outside the top end of the pull rod, and a stepper motor 2 is fixed outside one side of the limit ring, and a gear 1 is fixed to the output end of the stepper motor 2, and one side of the gear 1 is meshed and connected with one side of the gear ring 1.

[0009] Furthermore, the movable stretching mechanism also includes a gear ring 2, a drive motor 1 and a gear 2. The outer surface of the sleeve is embedded with a gear ring 2, a drive motor 1 is fixed to the outside of one side of the bridge, and a gear 2 is fixed to the output end of the drive motor 1, and one side of the gear 2 is meshed and connected with one side of the gear ring 2.

[0010] Furthermore, the center positioning mechanism includes a resistance cover and a resistance plate, a semicircular resistance cover is provided on one side of the bottom end of the bridge frame, and a semicircular resistance plate is fixed at the bottom edge of the resistance cover, and the center points of the resistance cover, the bridge frame and the pull rod are on the same vertical line.

[0011] Furthermore, the center positioning mechanism also includes a connecting rod, a through slot and a worm gear. A connecting rod is provided at the top of the interference cover, a worm gear is fixed to the end of the connecting rod away from the interference cover, and a through slot is provided on one side of the mounting frame close to the connecting rod.

[0012] Furthermore, the center positioning mechanism also includes a worm, a connecting gear and a limiting rack. A through slot is provided on one side of the mounting frame close to the connecting rod. The worm wheel is rotatably installed on the inner wall of the through slot close to the top. A worm is meshed at the top of the worm wheel, and the worm is rotatably installed on the outside of one side of the mounting frame through a bracket. A connecting gear is fixed to one end of the worm, and a limiting rack is fixed to the outside of one side of the bridge frame, and one side of the limiting rack is meshed and connected 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 top side of the connecting rod close to the resistance cover, and the output end of the second drive motor is fixed to the top center of the resistance cover. A plurality of sweeping brushes are fixed at equal angles on the inner wall of the resistance plate, and an iron scraper plate is slidably installed through one side of the top of the resistance plate.

[0014] Furthermore, the cleaning mechanism also includes a limit rod and a compression spring. The limit rod is longitudinally fixed to the outside of the side of the resistance plate away from the sweeping brush, one side of the iron scraper plate is slidably installed on the outside of one side of the limit rod, and a compression spring is sleeved and installed on the outside of one side of the limit rod, and both ends of the compression spring are respectively installed on one side of the iron scraper plate and the limit rod.

[0015] Furthermore, the cleaning mechanism also includes a collecting box and a limiting magnet. The collecting box is fixed to one side of the bottom end of the mounting frame close to the through slot, and the limiting magnet is fixed obliquely to the outside of the top end of the collecting box away from the iron scraper plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the setting of the mounting frame and the moving wheel and the positioning of the threaded rod, the auxiliary rod and the limit block, the stretching device can be pushed and shifted at will during on-site operation. At the same time, the bridge frame and the sleeve can be automatically set on the nut to be tightened and automatically rotated and tightened during use. At the same time, the top pull rod can be automatically screwed into the top of the bolt to be stretched, so that the whole does not need to be manually carried, shifted, set and wiped during actual use. The overall flexibility is higher, the overall stretching and tightening efficiency is improved, and the work pressure of the operator is reduced;

[0018] 2. Through the arrangement of the semicircular interference cover and the interference plate at the bottom of the mounting frame, when the device is displaced for use, the center position can be determined by only contacting the interference plate on one side of the bolt to be stretched, so as to ensure that the center of the subsequent sleeve and the pull rod are on the same center line as the center of the bolt to be stretched, so as to ensure that they can be aligned when they are lowered and screwed in later, and the overall positioning accuracy is ensured, and there is no need for manual movement and positioning, which makes the overall use more convenient and improves the efficiency of the positioning and stretching operation. At the same time, after the positioning is completed, when the bridge and the lowering are lowered, the worm gear, the worm gear, the connecting gear and the limiting rack are driven to synchronously rotate a certain angle through the coordinated transmission of the worm gear, the worm gear, the connecting gear and the limiting rack, so that the interference cover and the interference plate rotate away from the bottom of the sleeve, so as to avoid collision and conflict with the descending sleeve, and can be automatically retracted. After the later stretching and tightening operation is completed, when the sleeve rises and resets, it will drive the interference cover and the interference plate to rotate and reset synchronously, so as to ensure that when the subsequent device moves to align other screws, the positioning accuracy can still be guaranteed, and the overall use effect is better;

[0019] 3. By setting a plurality of sweeping brushes installed around the inner wall of the contact plate and the second driving motor, when the contact plate contacts the outer wall of the bolt to be stretched, the second driving motor drives the contact cover, the contact plate and the sweeping brush to rotate, so as to brush and clean the thread groove on the outer wall of the bolt to be stretched, thereby avoiding impurities adhering to the inner wall of the thread and affecting the normal screwing of the subsequent pull rod, ensuring that the pull rod and the bolt can be smoothly rotated and tightened, reducing wear. At the same time, when the bridge frame is lowered, the connecting rod drives the contact cover and the contact plate to rotate and deviate by a certain angle. At this time, one side of the bottom of the contact plate will be aligned with the limiting magnet on one side, and the iron scraping plate at the top of the contact plate will be attracted and moved through the adsorption force of the limiting magnet, and the impurities adhered and stuck in the sweeping brush will be swept off and scraped into the collection box at the bottom through the movement of the iron scraping plate, so as to ensure the cleanliness of the sweeping brush and the sustainable use of the sweeping brush, and the overall use is more convenient and the cleaning effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the screw stretching device of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the bridge frame and the sleeve installation of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the mobile stretching mechanism and the mounting frame of the present invention;

[0023] Figure 4 It is a schematic diagram of a partial cross-sectional three-dimensional structure of the center positioning mechanism and the mounting frame of the present invention;

[0024] Figure 5 For the present invention Figure 4 A in the middle is a schematic diagram of the enlarged structure;

[0025] Figure 6 This is a schematic diagram showing the collision between the collision plate and the screw to be stretched according to the present invention;

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

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the iron scraper plate and the limit rod installed in the present invention;

[0028] Fig. 9 It is a schematic diagram demonstrating the rotation of the resistance plate and the alignment of the limiting magnet of the present invention.

[0029] In the figure: 1, mounting frame; 2, bridge frame; 3, sleeve; 4, pull rod; 5, injection chamber; 6, hydraulic pump; 7, resistance block; 8, mobile stretching mechanism; 801, moving wheel; 802, threaded rod; 803, auxiliary rod; 804, stepping motor 1; 805, limit block; 806, electric telescopic rod; 807, limit ring; 808, gear ring 1; 809, stepping motor 2; 8010, gear 1; 8011, gear ring 2; 8012, driving motor 1 ;8013, gear two; 9, center positioning mechanism; 901, resistance cover; 902, resistance plate; 903, connecting rod; 904, through slot; 905, worm wheel; 906, worm; 907, connecting gear; 908, limit rack; 10, cleaning mechanism; 1001, drive motor two; 1002, sweeping brush; 1003, iron scraping plate; 1004, limit rod; 1005, compression spring; 1006, collection box; 1007, limit magnet. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-9The present invention provides a technical solution: a hydraulic screw stretching device, comprising a mounting frame 1, a bridge frame 2 is arranged inside the mounting frame 1, a sleeve 3 is rotatably mounted on the inner wall of the bottom end of the bridge frame 2, a pull rod 4 is arranged on the top side of the bridge frame 2, a liquid injection cavity 5 is embedded on the inner wall of the top end of the bridge frame 2, a hydraulic pump 6 is fixed to the outside of one side of the bridge frame 2, and the output end of the hydraulic pump 6 is installed inside the bottom side of the liquid injection cavity 5 through a conduit, a resistance block 7 is installed on the top sliding seal of the liquid injection cavity 5, a mobile stretching mechanism 8, and the mobile stretching mechanism 8 is arranged inside one side of the mounting frame 1; a center positioning mechanism 9, and the center positioning mechanism 9 is arranged outside the bottom side of the bridge frame 2; a cleaning mechanism 10, and the cleaning mechanism 10 is arranged outside the bottom side of the mounting frame 1.

[0032] When the hydraulic screw stretching device provided by the present invention is actually used, the present device is first pushed to one side of one of the bolts to be stretched on the pump turbine unit. During the pushing process, the center positioning mechanism 9 is set to ensure that the center of the subsequent sleeve 3 and the pull rod 4 is on the same center line as the center of the bolt to be stretched, ensuring that they can be aligned when they are lowered and screwed in later, ensuring the overall positioning accuracy, and no manual movement and positioning are required. After the positioning is completed, the cleaning mechanism 10 is operated to brush and clean the thread groove on the outer wall of the bolt to be stretched to avoid impurities adhering to the inner wall of the thread, which affects the normal screwing in of the subsequent pull rod 4, ensuring that the pull rod 4 and the bolt can be smoothly rotated and tightened to reduce wear. After the cleaning is completed, the movement of some components inside the stretching mechanism 8 is started to automatically stretch the bolt and automatically tighten the bolt. The overall stretching and tightening efficiency is high, thereby improving the overall assembly efficiency.

[0033] In some embodiments, the movable stretching mechanism 8 includes a movable wheel 801, a threaded rod 802, an auxiliary rod 803, a stepper motor 804 and a limit block 805. The movable wheel 801 is installed at the bottom corner of the mounting frame 1, the threaded rod 802 is longitudinally rotatably installed on one side of the mounting frame 1, and the auxiliary rod 803 is longitudinally fixed on the other side of the mounting frame 1. The outer side of one side of the threaded rod 802 passes through the threaded installation limit block 805, and the outer side of one side of the auxiliary rod 803 also passes through the sliding installation limit block 805, and one end of the two limit blocks 805 are both fixed to the outside of one side of the sleeve 3, and a stepper motor 804 is fixed to one side of the bottom end of the mounting frame 1, and the output end of the stepper motor 804 is coaxially fixed with one end of the threaded rod 802.

[0034] Combination Figure 1 and Figure 3As shown, when in use, the device is first pushed to one side of one of the bolts to be stretched on the pump-turbine unit, and the bridge frame 2, sleeve 3 and pull rod 4 are limited and fixed by the mounting frame 1, and multiple moving wheels 801 are set at the bottom of the mounting frame 1. This makes the stretching device more convenient in actual use, without the need for manual transportation and alignment, and more efficient when stretching multiple bolts, reducing the work pressure of the staff.

[0035] In some embodiments, the center positioning mechanism 9 includes a contact cover 901 and a contact plate 902, a semicircular contact cover 901 is provided on one side of the bottom end of the bridge frame 2, and a semicircular contact plate 902 is fixed at the bottom edge of the contact cover 901, and the center points of the contact cover 901, the bridge frame 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 on the top of the contact cover 901, a worm gear 905 is fixed on the end of the connecting rod 903 away from the contact cover 901, and a through groove 904 is penetrated on the side of the mounting frame 1 close to the connecting rod 903.

[0036] Combination Figure 4 and Figure 6 As shown, by setting the semicircular abutment cover 901 and the abutment plate 902 at the bottom of the mounting frame 1, when the device is shifted for use, it is only necessary to abut the abutment plate 902 against one side of the bolt to be stretched to determine the center position, so as to ensure that the center of the subsequent sleeve 3 and the pull rod 4 is on the same center line as the center of the bolt to be stretched, to ensure that they can be aligned when they are lowered and screwed in later, to ensure the overall positioning accuracy, without the need for manual movement and positioning, the overall use is more convenient, and the efficiency of the positioning and stretching operation is improved.

[0037] In some embodiments, the cleaning mechanism 10 includes a driving motor 1001, a sweeping brush 1002 and an iron scraping plate 1003. The driving motor 1001 is fixed to the side of the connecting rod 903 close to the top of the resistance cover 901, and the output end of the driving motor 1001 is fixed to the center of the top of the resistance cover 901. A plurality of sweeping brushes 1002 are fixed at equal angles on the inner wall of the resistance plate 902, and an iron scraping plate 1003 is slidably installed through the top side of the resistance plate 902.

[0038] Combination Figure 7As shown, after the contact plate 902 and the bolt are aligned and the center position is established, the second driving motor 1001 on the bottom side can be started, and the output shaft of the second driving motor 1001 can be rotated, thereby driving the contact cover 901 and the contact plate 902 installed at the bottom to rotate, thereby driving the multiple sweeping brushes 1002 inside the contact plate 902 to rotate against the outside of the bolt, so as to brush and clean the thread groove on the outer wall of the tension bolt to avoid impurities adhering to the inner wall of the thread, affecting the normal screwing in of the subsequent pull rod 4, and ensuring that the pull rod 4 and the bolt can be rotated and tightened smoothly to reduce wear.

[0039] In some embodiments, the center positioning mechanism 9 also includes a worm 906, a connecting gear 907 and a limiting rack 908. A through slot 904 is provided on one side of the mounting frame 1 close to the connecting rod 903. A worm wheel 905 is rotatably mounted on an inner wall of the through slot 904 close to the top. A worm 906 is meshed at the top of the worm wheel 905, and the worm 906 is rotatably mounted on the outside of one side of the mounting frame 1 through a bracket. A connecting gear 907 is fixed at 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 and connected with one side of the connecting gear 907.

[0040] Combination Figure 4 , Figure 5 and Figure 6 As shown, when the contact plate 902 is aligned with the bolt to establish the center position and the thread groove on the outer wall of the bolt is cleaned, the stepper motor 804 on one side is controlled to start, and the output shaft of the stepper motor 804 is rotated to drive the threaded rod 802 to rotate, and at the same time, the auxiliary rod 803 is limited and the limit block 805 is installed, so as to drive the bridge 2 and the sleeve 3 to start descending. When the bridge 2 and are descending, the limit rack 908 on one side will be driven to move downward synchronously, and the movement of the limit rack 908 will drive the meshing connecting gear 907 on one side to rotate, and the connecting gear 907 is rotated to This drives the worm 906 to rotate, and finally drives the worm wheel 905 and the connecting rod 903 connected to its bottom end to rotate, so that the contact cover 901 and the contact plate 902 rotate synchronously by a certain angle, so that the contact cover 901 and the contact plate 902 rotate away from the bottom of the sleeve 3, thereby avoiding collision and conflict with the descending sleeve 3, and can be automatically retracted. After the subsequent stretching and tightening operation is completed, the sleeve 3 will drive the contact cover 901 and the contact plate 902 to rotate and reset synchronously when it rises and resets, ensuring that when the subsequent device moves to align other screws, the alignment accuracy can still be guaranteed, and the overall use effect is better.

[0041] When the bridge 2 drives the limit 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, and then the bridge 2 continues to descend. At this time, the limit rack 908 is disengaged from the connecting gear 907. At this time, through the self-locking performance of the worm 906 and the worm wheel 905, the limit rack 908 is disengaged from the connecting gear 907, and the contact cover 901 and the contact plate 902 will not rotate to reset, so as to ensure the stability after rotation and the overall operation stability.

[0042] In some embodiments, the mobile stretching mechanism 8 also includes an electric telescopic rod 806, a limiting ring 807, a gear ring 1 808, a stepper motor 2 809 and a gear 1 8010. The electric telescopic rod 806 is vertically penetrated and fixed inside the limiting block 805. The 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 and installed inside one side of the limiting ring 807. The gear ring 1 808 is penetrated and fixed outside the top end of the pull rod 4. The stepper motor 2 809 is fixed outside one side of the limiting ring 807. A gear 8010 is fixed to the output end of the stepper motor 809, and one side of the gear 8010 is meshedly connected to one side of the gear ring 808; the mobile stretching mechanism 8 also includes a gear ring 8011, a drive motor 8012 and a gear 8013, the outer surface of the sleeve 3 is embedded with a gear ring 8011, a drive motor 8012 is fixed to the outside of one side of the bridge 2, and a gear 8013 is fixed to the output end of the drive motor 8012, and one side of the gear 8013 is meshedly connected to one side of the gear ring 8011.

[0043] Combination Figure 1 , Figure 2 and Figure 3 As shown, when the bridge 2 and the sleeve 3 descend to the bottom, the sleeve 3 engages the nut cover outside the bolt, and then the stepper motor 804 is controlled to stop running. At this time, the stepper motor 2 809 at the top is controlled to start, thereby driving the gear 8010 to rotate. Through the rotation of the gear 8010, the gear ring 808 on one side is driven to rotate, thereby driving the pull rod 4 to start rotating, and synchronously starting the electric telescopic rod 806 to recover, so that the pull rod 4 rotates and descends to be threadedly fixed with the top of the screw. At the same time, the bottom wall on one side of the top of the pull rod 4 is in contact with the top of the resistance block 7. At this time, the electric telescopic rod 806 and the stepper motor 804 are turned off.

[0044] Then, the hydraulic pump 6 is started to pressurize and inject liquid into the injection chamber 5, so that the resistance block 7 is lifted to resist the pull rod 4, and the pull rod 4 is lifted and moved, thereby driving the bottom bolt to be synchronously stretched to a certain height, and then the drive motor 1 8012 is started to drive the gear 2 8013 to rotate, thereby driving the external meshing gear ring 2 8011 to rotate, thereby driving the sleeve 3 to rotate, thereby tightening the nut outside the bolt, and finally completing the bolt stretching and tightening operation.

[0045] In some embodiments, the cleaning mechanism 10 also includes a limiting rod 1004 and a compression spring 1005, the limiting rod 1004 is longitudinally fixed on the outside of the side of the contact plate 902 away from the sweeping brush 1002, one side of the iron scraping plate 1003 is slidably installed on the outside of one side of the limiting rod 1004, and a compression spring 1005 is installed on the outside of one side of the limiting rod 1004, and the two ends of the compression spring 1005 are respectively installed on one side of the iron scraping plate 1003 and the limiting rod 1004; the cleaning mechanism 10 also includes a collecting box 1006 and a limiting magnet 1007, the collecting box 1006 is fixed on the bottom side of the mounting frame 1 close to the through slot 904, and the limiting magnet 1007 is obliquely fixed on the top outside of the side of the collecting box 1006 away from the iron scraping plate 1003.

[0046] Combination Figure 7 , Figure 8 and Fig. 9 As shown, when the bridge 2 is descending, the connecting rod 903 drives the contact cover 901 and the contact plate 902 to rotate and deviate to a certain angle. At this time, the bottom side of the contact plate 902 will be aligned with the limiting magnet 1007 on one side. The iron scraper plate 1003 at the top of the contact plate 902 is attracted and moved by the adsorption force of the limiting magnet 1007. Through the movement of the iron scraper plate 1003, the impurities adhered to and stuck in the sweeping brush 1002 are swept away and scraped into the collection box 1006 at the bottom to ensure that the sweeping brush The cleanliness of 1002 ensures the sustainable usability of the sweeping brush 1002, and the overall use is more convenient and the cleaning effect is better. When the subsequent connecting rod 903 drives the resistance cover 901 and the resistance plate 902 to rotate and reset, when the limiting magnet 1007 and the iron scraping plate 1003 are not in alignment, at this time, through the rebound of the compression spring 1005 and the guidance of the limiting rod 1004, the iron scraping plate 1003 will synchronously rebound and reset to the top of the resistance plate 902, ensuring the subsequent secondary use and the overall use effect is good.

[0047] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

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

Claims

1. A hydraulic screw stretching device, comprising a mounting frame (1), characterized in that: A bridge frame (2) is arranged inside the mounting frame (1), a sleeve (3) is rotatably mounted on the inner wall of the bottom end of the bridge frame (2), a pull rod (4) is arranged on one side of the top end of the bridge frame (2), a liquid injection cavity (5) is embedded on the inner wall of the top end of the bridge frame (2), a hydraulic pump (6) is fixed to the outside of one side of the bridge frame (2), and the output end of the hydraulic pump (6) is installed inside the bottom end of the liquid injection cavity (5) through a conduit, and a resistance block (7) is installed on the top end of the liquid injection cavity (5) for sliding sealing; A movable stretching mechanism (8), wherein the movable stretching mechanism (8) is arranged inside one side of the mounting frame (1); A center positioning mechanism (9), the center positioning mechanism (9) being arranged outside one side of the bottom end of the bridge frame (2); A cleaning mechanism (10) is arranged outside one side of the bottom end of the mounting frame (1).

2. A hydraulic screw stretching device according to claim 1, characterized in that: The movable stretching mechanism (8) comprises a movable wheel (801), a threaded rod (802), an auxiliary rod (803), a stepping motor (804) and a limit block (805). The movable wheel (801) is installed at the bottom corner of the mounting frame (1). The threaded rod (802) is longitudinally rotatably installed on one side of the mounting frame (1), and the auxiliary rod (803) is longitudinally fixed on the other side of the mounting frame (1). The threaded limit block (805) is threadedly installed on the outside of one side of the threaded rod (802), and the auxiliary rod (803) is also slidably installed on the outside of one side of the auxiliary rod (803), and one end of the two limit blocks (805) is fixed to the outside of one side of the sleeve (3). The stepping motor (804) is fixed to one side of the bottom end of the mounting frame (1), and the output end of the stepping motor (804) is coaxially fixed with one end of the threaded rod (802).

3. A hydraulic screw stretching device according to claim 2, characterized in that: The movable stretching mechanism (8) also includes an electric telescopic rod (806), a limiting ring (807), a gear ring 1 (808), a stepper motor 2 (809) and a gear 1 (8010). The electric telescopic rod (806) is longitudinally penetrated and fixed inside the 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 penetrated and rotatably engaged and installed inside one side of the limiting ring (807). A gear ring 1 (808) is penetrated and fixed outside the top end of the pull rod (4). A stepper motor 2 (809) is fixed outside one side of the limiting ring (807), and a gear 1 (8010) is fixed to the output end of the stepper motor 2 (809), and one side of the gear 1 (8010) is meshedly connected with one side of the gear ring 1 (808).

4. A hydraulic screw stretching device according to claim 1, characterized in that: The movable stretching mechanism (8) further comprises a second gear ring (8011), a first drive motor (8012) and a second gear (8013); the outer surface of the sleeve (3) is embedded with the second gear ring (8011) and surrounded by it; the first drive motor (8012) is fixed to the outside of one side of the bridge (2); the second gear (8013) is fixed to the output end of the first drive motor (8012); and one side of the second gear (8013) is meshedly connected with one side of the second gear ring (8011).

5. The hydraulic screw stretching device according to claim 1, characterized in that: The center positioning mechanism (9) comprises a resistance cover (901) and a resistance plate (902); a semicircular resistance cover (901) is provided on one side of the bottom end of the bridge frame (2); a semicircular resistance plate (902) is fixed at the bottom edge of the resistance cover (901); and the center points of the resistance cover (901), the bridge frame (2) and the pull rod (4) are on the same vertical line.

6. A hydraulic screw stretching device according to claim 5, characterized in that: The center positioning mechanism (9) further comprises a connecting rod (903), a through slot (904) and a worm gear (905); the top end of the abutment cover (901) is provided with a connecting rod (903); the end of the connecting rod (903) away from the abutment cover (901) is fixed with a worm gear (905); and a through slot (904) is provided on one side of the mounting frame (1) close to the connecting rod (903).

7. A hydraulic screw stretching device according to claim 6, characterized in that: The center positioning mechanism (9) also includes a worm (906), a connecting gear (907) and a limiting rack (908); a through slot (904) is provided on one side of the mounting frame (1) close to the connecting rod (903); the worm wheel (905) is rotatably mounted on an inner wall of the through slot (904) close to the top; a worm (906) is meshedly provided at the top of the worm wheel (905); and the worm (906) is rotatably mounted on the outside of one side of the mounting frame (1) through a bracket; a connecting gear (907) is fixed at one end of the worm (906); a 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 meshedly connected with one side of the connecting gear (907).

8. A hydraulic screw stretching device according to claim 6, characterized in that: The cleaning mechanism (10) comprises a second driving motor (1001), a sweeping brush (1002) and an iron scraping plate (1003); the second driving motor (1001) is fixed to one side of the connecting rod (903) close to the top end of the contact cover (901), and the output end of the second driving motor (1001) is fixed to the center of the top end of the contact cover (901); a plurality of sweeping brushes (1002) are fixed at equal angles on the inner wall of the contact plate (902); and the iron scraping plate (1003) is slidably installed through one side of the top end of the contact plate (902).

9. A hydraulic screw stretching device according to claim 8, characterized in that: The cleaning mechanism (10) further comprises a limiting rod (1004) and a compression spring (1005); the limiting rod (1004) is longitudinally fixed to the outside of one side of the abutment plate (902) away from the sweeping brush (1002); one side of the iron scraping plate (1003) is slidably mounted on the outside of one side of the limiting rod (1004); a compression spring (1005) is sleeved and mounted on the outside of one side of the limiting rod (1004); and two ends of the compression spring (1005) are respectively mounted on one side of the iron scraping plate (1003) and the limiting rod (1004).

10. A hydraulic screw stretching device according to claim 8, characterized in that: The cleaning mechanism (10) further comprises a collecting box (1006) and a limiting magnet (1007); the collecting box (1006) is fixed to one side of the bottom end of the mounting frame (1) close to the through slot (904), and the limiting magnet (1007) is fixed obliquely to the outside of the top end of the collecting box (1006) away from the iron scraper plate (1003).

Images