A high-stability low-pressure tensioner

Abstract

The present invention discloses a high-stability low-pressure tensioner, comprising an upper pressure plate, a middle pressure plate, a lower pressure plate and a housing, wherein two screws are provided at the bottom of the upper pressure plate, two middle holes and a lower hole are provided on the middle pressure plate and the lower pressure plate respectively, the screws pass through the middle holes and the lower holes in sequence, and a locking nut is connected to the screws; the present invention also comprises a pre-tightening mechanism arranged on both sides of the lower pressure plate and matched with the two screws respectively, the pre-tightening mechanism comprising a pre-tightening knob, a follower block and a pre-tightening sleeve, the pre-tightening sleeve is mounted on the outer circumference of the screw, the side of the pre-tightening sleeve is vertically provided with a plurality of bevel teeth, a frustum is provided on each side of the lower pressure plate, an outer end of the frustum is provided with an active cavity, an inner end of the active cavity is provided with a guide hole, a pre-tightening knob is connected to the outer end of the frustum, a follower block is provided in the active cavity, and rotating the pre-tightening knob can drive the follower block to slide axially, and a locking protrusion is provided on the follower block. The present invention prevents the cable from sliding off when the nut is not tightened or when the nut is loosened, which facilitates high-altitude operation by the staff and is also safer.

Description

Technical Field

[0001] The present invention relates to the technical field of wire tensioners, in particular to a low-pressure wire tensioner with high stability. Background Art

[0002] Wire tensioners are typically categorized into top-fix, side-fix, and terminal-fix types. Terminal-fix wire tensioners are specialized tools used to secure conductor terminals during power construction. They are primarily used when laying low-voltage overhead insulated lines along walls or securing high-voltage line terminals. Their core function is to tighten and insulate conductors through mechanical structures, ensuring line stability and safety.

[0003] The utility model patent with application number CN202020918238.3 discloses a terminal tensioner. When installing, open the outer cover, screw the nut to the uppermost end of the first screw and the second screw, and then rotate the upper pressure plate and the middle pressure plate around the first screw respectively to make the upper pressure plate and the middle pressure plate disengage from the second screw. At this time, place the cable on the lower recessed portion of the lower pressure plate, rotate the middle pressure plate to return the middle pressure plate, and then place the cable on the concave surface on the upper side of the middle pressure plate, rotate the upper pressure plate to return the upper pressure plate, tighten the nut, and cover the outer cover so that the cable is passed through and pressed between the upper pressure plate and the middle pressure plate, and between the middle pressure plate and the upper pressure plate.

[0004] Since the cable fixing operation is carried out at high altitude, the above structure is adopted. When the nut is not tightened, the cables passed between the upper pressure plate and the middle pressure plate, and between the middle pressure plate and the lower pressure plate are not subjected to the compression force. They are prone to slipping or even detaching from the tensioner during operation. The staff need to pull the cables back, which is very troublesome, increases the workload, and has certain safety hazards. In addition, during disassembly, when the nut is loosened, the cable will instantly slide axially and detach from the tensioner under the action of the axial tension force, which is prone to safety accidents. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-stability low-pressure tensioner. The structure of the present invention is stable and reliable. When the nut is not tightened or when the nut is loosened, the lower pressure plate can be positioned through the pre-tightening mechanism, so that the cable is kept under a certain compression force, thereby preventing it from sliding and falling off, greatly facilitating the high-altitude operation of the staff and also improving safety.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-stability low-pressure tensioner, comprising an upper pressure plate, a middle pressure plate, a lower pressure plate and a shell, wherein two screws are symmetrically arranged at the bottom of the upper pressure plate, and two middle holes and a lower hole are respectively provided on the middle pressure plate and the lower pressure plate, and the screw passes through the middle hole and the lower hole in sequence, and the screw is threadedly connected with a locking nut at a position corresponding to the position below the lower pressure plate, and the shell is detachably mounted on the lower end of the lower pressure plate and covers the bottom of the screw and the locking nut inside; it also includes a pre-tightening mechanism arranged on both sides of the lower pressure plate and cooperating with the two screws, and the pre-tightening mechanism includes a pre-tightening screw A button, a follower block and a pre-tightening sleeve, the pre-tightening sleeve is installed on the outer circumference of the screw, and the side of the pre-tightening sleeve is evenly arranged with a plurality of bevel teeth with a horizontal upper end and an inclined lower end along the vertical direction. A frustum portion is provided on both sides of the lower pressure plate, and an active cavity is provided at the outer end of the frustum portion. A guide hole with a rectangular cross-section and connected to the lower hole is provided at the inner end of the active cavity. The pre-tightening knob is rotatably connected to the outer end of the frustum portion, and the follower block is arranged in the active cavity, and rotating the pre-tightening knob can drive the follower block to slide axially. The follower block is provided with a locking protrusion that passes through the guide hole and extends into the lower hole to cooperate with the bevel teeth.

[0007] When disassembling, it is only necessary to operate the pre-tightening knob to make the follower block drive the locking protrusion to disengage the bevel teeth of the pre-tightening sleeve to release the lock on the lower pressure plate and the screw.

[0008] The present invention is further provided that the pre-tightening mechanism also includes four first magnets and four second magnets, the inner end of the pre-tightening knob is distributed with four first mounting grooves in a circular array, the four first magnets are respectively embedded in the four first mounting grooves, and the magnetic poles of each two adjacent first magnets are set in opposite directions, and the inner wall of the first mounting groove is provided with a plurality of hemispherical first damping protrusions near the outer end for confining the first magnet in the first mounting groove; the outer end of the follower block is distributed with four second mounting grooves in a circular array, the four second magnets are respectively embedded in the four second mounting grooves, and the magnetic poles of each two adjacent second magnets are set in opposite directions, and the inner wall of the second mounting groove is provided with a plurality of hemispherical second damping protrusions near the outer end for confining the second magnet in the second mounting groove; when the pre-tightening knob is rotated, all the first magnets are in a state of mutual attraction or mutual repulsion with the corresponding second magnets.

[0009] By adopting the above technical solution, the initial state is that the first magnet and the second magnet are in a state of mutual repulsion. At this time, the follower block is located at the innermost end of the movable cavity under the action of the repulsive force, and its locking protrusion is engaged with the bevel teeth on the pre-tightening sleeve. At the same time, when the pre-tightening protrusion moves upward relative to the pre-tightening sleeve, its upward movement will not be blocked because the bottom of the bevel teeth is an inclined surface, and the top of the bevel teeth is a horizontal surface, thereby preventing the lower pressure plate from retreating. When disassembly is required, the pre-tightening knob is rotated 90° so that the first magnet and the second magnet are in a state of mutual attraction. At this time, the follower block slides outward under the action of the magnetic attraction force, and its locking protrusion is separated from the bevel teeth on the pre-tightening sleeve, thereby contacting the locking of the lower pressure plate and the screw. In addition, the installation structure of the first magnet and the second magnet is very convenient and firm.

[0010] The present invention is further configured such that the pre-tightening mechanism also includes a pre-tightening spring, a first spring groove is provided at the inner end of the pre-tightening knob, a second spring groove is provided at the outer end of the follower block, and both ends of the pre-tightening spring are respectively embedded in the first spring groove and the second spring groove.

[0011] By adopting the above technical solution, on the basis of the repulsive force of the magnet, a spring force is added to the follower block through the pre-tightening spring, so that the locking protrusion is not easily separated due to shaking when it presses against the bevel tooth, thereby improving the reliability of the locking structure.

[0012] The present invention is further configured such that two hemispherical positioning protrusions are provided on the inner circular surface of the pre-tightening knob, and two arc-shaped guide grooves are provided on the outer circular surface of the frustum for sliding positioning of the positioning protrusions, and the circular angle corresponding to the extension trajectory of the arc-shaped guide groove is 90°, and two ends of the arc-shaped guide groove are respectively provided with two engagement positioning grooves and separation positioning grooves for embedding the positioning protrusions, and the depth of the arc-shaped guide groove is smaller than the engagement positioning groove and the separation positioning groove.

[0013] By adopting the above technical solution, the positioning effect can be achieved after the pre-tightening knob is rotated 90°, which not only facilitates precise angle adjustment, so that the first magnet and the second magnet are perfectly attracted or repelled, but also improves the operating feel.

[0014] The present invention is further configured such that a screw hole is radially opened on the side of the pre-tightening sleeve, a slot corresponding to the screw hole is opened on the side of the screw rod, a hexagonal stud is threadedly connected to the screw hole, and the inner end of the hexagonal stud is inserted into the slot.

[0015] By adopting the above technical solution, the fixed installation of the shaft sleeve and the screw can be achieved, the connection structure is simple and reliable, and the disassembly and assembly is very convenient.

[0016] The present invention is further configured such that a plurality of card slots are provided on the outer side of the lower pressing plate, and a plurality of card blocks that fit with the card slots are provided on the inner side of the shell.

[0017] By adopting the above technical solution, which is the first connection method between the shell and the lower pressure plate, the shell and the lower pressure plate can be fixedly installed, and the disassembly and assembly operations are very convenient.

[0018] The present invention is further configured to include a locking mechanism for locking the shell, the locking mechanism including an operating component and an ejection component, the operating component including a base, a guide sleeve, a locking rod, an operating knob and a compression spring, a positioning groove is provided at the front of the shell, the base is fixedly installed in the positioning groove, and a directional recess is provided on the inner side wall of the positioning groove, the base is provided with a directional protrusion that fits with the directional recess, the guide sleeve is fixedly installed in the base, the front end of the guide sleeve is provided with a limiting flange extending inward, the locking rod passes through the guide sleeve, and the outer periphery of the locking rod is provided with a limit flange that fits the inner circular surface of the guide sleeve The guide flange fits tightly, the compression spring is clamped between the guide flange and the limit flange, the bottom of the lower pressure plate is provided with a movable frame extending into the shell, the side of the movable frame is provided with a lock hole, the shell is provided with an outer hole corresponding to the lock hole, the locking rod passes through the outer hole and cooperates with the lock hole, the outer end of the locking rod is connected to the operating knob, and the operating knob drives the locking rod to insert or disengage from the lock hole, the ejection assembly is arranged in the shell, and when the locking rod disengages from the lock hole, the ejection assembly acts on the movable frame to separate the shell from the lower pressure plate, and the bottom of the movable frame is also provided with an ejection inclined surface for pushing the locking rod out when the movable frame extends into the shell.

[0019] By adopting the above technical solution, which is a second connection method between the shell and the lower pressure plate, when the operating knob of the operating assembly is in the initial position, the compression spring acts on the guide flange on the locking rod, causing the locking rod to move inward and insert into the lock hole of the movable frame at the bottom of the lower pressure plate, thereby locking the shell and the lower pressure plate. When the shell needs to be disassembled, the locking rod is driven outward by the operating knob, and the locking rod is disengaged from the lock hole of the movable frame at the bottom of the lower pressure plate. At this time, the shell is automatically separated from the lower pressure plate under the action of the ejection assembly. This structure can not only lock the shell and the lower pressure plate, but also eliminate the hidden danger of loose connection caused by material aging in the first connection method, and the structural reliability is improved.

[0020] The present invention is further configured such that a plurality of first arc-shaped protrusions and first arc-shaped recesses are circumferentially spaced apart at the lower end of the operating knob, and a plurality of second arc-shaped protrusions and second arc-shaped recesses are circumferentially spaced apart at the upper end of the base, and the first arc-shaped protrusions and second arc-shaped recesses are matched with each other, and the first arc-shaped recesses and second arc-shaped protrusions are matched with each other.

[0021] By adopting the above technical solution, the operating knob is rotated. When the first arc-shaped convex portion on the operating knob fits with the second arc-shaped concave portion on the base, and the first arc-shaped concave portion and the second arc-shaped convex portion fit together, the locking rod is inserted into the lock hole. When the first arc-shaped convex portion on the operating knob abuts against the second arc-shaped convex portion on the base, the locking rod moves forward and disengages from the lock hole. Locking or unlocking is achieved by rotating the operating knob. The operation is very convenient and the structure is more stable and reliable.

[0022] The present invention is further configured such that the rear end of the guide sleeve is provided with an annular flange extending toward the periphery, and the rear end of the base is provided with an annular groove adapted to the annular flange.

[0023] By adopting the above technical solution, when the base is installed, the guide sleeve can be pressed and fixed, and the installation operation is very convenient.

[0024] The present invention is further configured as follows: the ejection assembly includes a sleeve, a ejector rod and an ejection spring, the sleeve is integrally arranged in the outer shell along the vertical direction, the ejector rod is movably arranged in the sleeve along the vertical direction, the ejection spring is arranged in the sleeve and applies an upward spring force to the ejector rod, so that the upper end of the ejector rod is tightly pressed against the lower end of the movable frame, the side of the sleeve is provided with at least one sliding hole extending vertically, and the sliding hole extends to the upper end of the sleeve, the side of the ejector rod is provided with a slider matching the sliding hole, and the inner wall of the sliding hole is provided near the upper end with a damping protrusion for constituting an upper travel limit for the slider, and the damping protrusion is hemispherical in shape.

[0025] By adopting the above technical solution, the extension and retraction of the ejector rod is achieved by the change in the force on the ejector spring. When the movable frame pushes the ejector rod to move into the sleeve, the ejector spring is compressed and stores energy. At the moment the ejector rod leaves the lock hole of the movable frame, the ejector spring releases energy, pushing out the movable frame and the upper pressure plate, and the outer shell is also moved in the direction away from the upper pressure plate under the reaction force, which facilitates the disassembly operation of the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a perspective view of the entire embodiment 1;

[0027] Figure 2 This is an exploded view of the entire embodiment 1;

[0028] Figure 3 A cross-sectional view of the entire embodiment 1;

[0029] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0030] Figure 5 This is a schematic diagram of the assembly structure of the pre-tightening knob and the first magnet in Example 1;

[0031] Figure 6 Schematic diagram of the assembly structure of the follower block and the second magnet in Example 1;

[0032] Figure 7 Schematic diagram of the structure of the lower pressing plate in Example 1;

[0033] Figure 8 Schematic diagram of the matching structure of the lower pressing plate and the housing in Example 1;

[0034] Figure 9 It is a perspective view of the entire embodiment 2;

[0035] Figure 10 A cross-sectional view of the entire embodiment 2;

[0036] Figure 11 Schematic diagram of the matching structure of the base and the housing in Example 2;

[0037] Figure 12 This is a schematic diagram of the first state of the operating component in Example 2;

[0038] Figure 13 This is a schematic diagram of the second state of the operating component in Example 2;

[0039] Figure 14 This is an exploded view of the operating assembly in Example 2;

[0040] Figure 15 Schematic diagram of the coordination structure between the ejection assembly and the movable frame in Example 2.

[0041] In the figure: 1. upper pressure plate; 2. middle pressure plate; 3. lower pressure plate; 4. housing; 5. screw; 6. middle hole; 7. lower hole; 8. locking nut; 9. preload mechanism; 10. preload knob; 11. follower block; 12. preload sleeve; 13. bevel gear; 14. frustum; 15. movable cavity; 16. guide hole; 17. locking protrusion; 18. first magnet; 19. second magnet; 20. first mounting groove; 21. first damping protrusion; 22. second mounting groove; 23. second damping protrusion; 24. preload spring; 25. first spring groove; 26. second spring groove; 27. positioning protrusion; 28. arc guide groove; 29. engaging positioning groove; 30. disengaging positioning groove; 31. screw hole; 32. slot; 33 , hexagonal screw; 34, slot; 35, block; 36, locking mechanism; 37, operating assembly; 38, ejection assembly; 39, base; 40, guide sleeve; 41, locking rod; 42, operating knob; 43, compression spring; 44, positioning groove; 45, directional recess; 46, directional protrusion; 47, limiting flange; 48, guide flange; 49, movable frame; 50, locking hole; 51, outer hole; 52, ejection slope; 53, first arc-shaped protrusion; 54, first arc-shaped recess; 55, second arc-shaped protrusion; 56, second arc-shaped recess; 57, annular flange; 58, annular groove; 59, sleeve; 60, ejector rod; 61, ejection spring; 62, sliding hole; 63, slider; 64, damping protrusion. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0043] Example: As shown in the attached Figures 1 to 8The shown embodiment shows a high-stability low-pressure tensioner, comprising an upper pressure plate 1, a middle pressure plate 2, a lower pressure plate 3 and a shell 4. Two screws 5 are symmetrically arranged at the bottom of the upper pressure plate 1, and two middle holes 6 and lower holes 7 are respectively provided on the middle pressure plate 2 and the lower pressure plate 3. The screw 5 passes through the middle hole 6 and the lower hole 7 in sequence. The screw 5 is threadedly connected with a locking nut 8 at the position corresponding to the position below the lower pressure plate 3. The shell 4 is detachably mounted on the lower end of the lower pressure plate 3 and covers the bottom of the screw 5 and the locking nut 8 inside. Among them, the lower end of the upper pressure plate 1, the upper end of the middle pressure plate 2, the lower end of the middle pressure plate 2 and the upper end of the lower pressure plate 3 all have an arc-shaped recess for limiting positioning, and a resistance-increasing convex strip is set in the arc-shaped recess; the tensioner also includes a pre-tightening mechanism 9 arranged on both sides of the lower pressure plate 3 and respectively matched with the two screws 5, the pre-tightening mechanism 9 includes a pre-tightening knob 10, a follower block 11 and a pre-tightening sleeve 12, the pre-tightening sleeve 12 is installed on the outer periphery of the screw 5, and the side of the pre-tightening sleeve 12 is evenly arranged with a plurality of bevel teeth 13 with a horizontal upper end and an inclined lower end along the vertical direction. A conical portion 14 is provided on each side of the plate 3, and an active cavity 15 is provided at the outer end of the conical portion 14. A guide hole 16 with a rectangular cross-section and connected to the lower hole 7 is provided at the inner end of the active cavity 15. The pre-tightening knob 10 is rotatably connected to the outer end of the conical portion 14, and the follower block 11 is arranged in the active cavity 15. Rotating the pre-tightening knob 10 can drive the follower block 11 to slide axially. The follower block 11 is provided with a locking protrusion 17 that passes through the guide hole 16 and extends into the lower hole 7 to cooperate with the bevel tooth 13. The upper end of the locking protrusion 17 is also a slope. When removing, just need to operate the pre-tightening knob 10 so that the following block 11 drives the locking convex part 17 to disengage the bevel teeth 13 of the pre-tightening sleeve 12, thereby releasing the lock of the lower pressure plate 3 and the screw 5, which greatly facilitates the high-altitude operation of the staff and has higher safety.

[0044] As attached Figures 3 to 6As shown, the pre-tightening mechanism 9 also includes four first magnets 18 and four second magnets 19, and the inner end of the pre-tightening knob 10 is provided with four first mounting grooves 20 in a circumferential array. The four first magnets 18 are respectively embedded in the four first mounting grooves 20, and the magnetic poles of each two adjacent first magnets 18 are set in opposite directions. The inner wall of the first mounting groove 20 is provided with a plurality of hemispherical first damping protrusions 21 near the outer end for limiting the first magnet 18 in the first mounting groove 20; the outer end of the follower block 11 is provided with four second mounting grooves 22 in a circumferential array, and the four second magnets 19 are respectively embedded in the four second mounting grooves 22, and the magnetic poles of each two adjacent second magnets 19 are set in opposite directions. The inner wall of the second mounting groove 22 is provided with a plurality of hemispherical second damping protrusions 23 near the outer end for limiting the second magnet 19 in the second mounting groove 22; when the pre-tightening knob 10 is rotated, all the first magnets 18 are in a state of mutual attraction or mutual repulsion with the corresponding second magnets 19. In the initial state, the first magnet 18 and the second magnet 19 are in a mutually repelling state. At this time, the follower block 11 is located at the innermost end of the movable cavity 15 under the action of the repulsive force, and its locking protrusion 17 is engaged with the bevel teeth 13 on the pre-tightening sleeve 12. At the same time, when the pre-tightening protrusion moves upward relative to the pre-tightening sleeve 12, its upward movement will not be blocked because the bottom of the bevel teeth 13 is an inclined surface, and the top of the bevel teeth 13 is a horizontal surface, thereby preventing the lower pressure plate 3 from retreating. When disassembly is required, the pre-tightening knob is rotated 1090° so that the first magnet 18 and the second magnet 19 are in a mutually attractive state. At this time, the follower block 11 slides outward under the action of the magnetic attraction, and its locking protrusion 17 separates from the bevel teeth 13 on the pre-tightening sleeve 12, thereby contacting the locking of the lower pressure plate 3 and the screw 5. In addition, the installation structure of the first magnet 18 and the second magnet 19 is very convenient and firm.

[0045] As attached Figure 4 As shown, the preload mechanism 9 also includes a preload spring 24. A first spring slot 25 is defined at the inner end of the preload knob 10, and a second spring slot 26 is defined at the outer end of the follower block 11. The two ends of the preload spring 24 are respectively embedded in the first spring slot 25 and the second spring slot 26. In addition to the repulsive force of the magnet, the preload spring 24 adds a spring force to the follower block 11, making it less likely for the locking protrusion 17 to separate due to shaking when it abuts the bevel teeth 13, thereby improving the reliability of the locking structure.

[0046] As attached Figure 5 and attached Figure 7As shown, the inner circumference of the preload knob 10 is provided with two hemispherical positioning protrusions 27, and the outer circumference of the truncated cone 14 is provided with two arcuate guide grooves 28 for sliding and positioning the positioning protrusions 27. The circular angle corresponding to the extension trajectory of the arcuate guide grooves 28 is 90 degrees. In addition, two ends of the arcuate guide groove 28 are respectively provided with two engaging positioning grooves 29 and disengaging positioning grooves 30 for the positioning protrusions 27 to be embedded. The depth of the arcuate guide grooves 28 is smaller than the engaging positioning grooves 29 and disengaging positioning grooves 30. The diameters of the engaging positioning grooves 29 and disengaging positioning grooves 30 are both equivalent to the diameters of the positioning protrusions 27. This design can achieve the positioning effect after the preload knob 10 is rotated 90 degrees, which not only facilitates precise angle adjustment, so that the first magnet 18 and the second magnet 19 are perfectly attracted or repelled, but also improves the operating feel.

[0047] As attached Figure 4 As shown, the preload sleeve 12 has a radially defined screw hole 31 on its side, and the screw rod 5 has a slot 32 corresponding to the screw hole 31 on its side. A hexagonal stud 33 is threadedly connected to the screw hole 31, and the inner end of the hexagonal stud 33 is inserted into the slot 32. This design allows for secure installation of both the sleeve and the screw rod 5, resulting in a simple and reliable connection structure and convenient assembly and disassembly. Alternatively, the two can be secured together by welding.

[0048] As attached Figure 8 As shown, the outer side of the lower pressing plate 3 is provided with a plurality of slots 34, and the inner side of the housing 4 is provided with a plurality of blocks 35 that fit into the slots 34. This is the first connection mode between the housing 4 and the lower pressing plate 3, which can realize the fixed installation of the housing 4 and the lower pressing plate 3, and the disassembly operation is very convenient.

[0049] Embodiment 2: Different from embodiment 1, the connection method between the lower pressing plate 3 and the housing 4 in this embodiment is different.

[0050] As attached Figures 9 to 15As shown, the tensioner also includes a locking mechanism 36 for locking the housing 4, the locking mechanism 36 includes an operating component 37 and an ejection component 38, the operating component 37 includes a base 39, a guide sleeve 40, a locking rod 41, an operating knob 42 and a compression spring 43, the front portion of the housing 4 is provided with a positioning groove 44, the base 39 is fixedly installed in the positioning groove 44, and a directional recess 45 is provided on the inner side wall of the positioning groove 44, the base 39 is provided with a directional protrusion 46 that fits with the directional recess 45, and the two can be connected by glue or hot melt, the guide sleeve 40 is fixedly installed in the base 39, the outer diameter of the guide sleeve 40 is equivalent to the inner diameter of the base 39, the front end of the guide sleeve 40 is provided with a limiting flange 47 extending inwardly, the locking rod 41 passes through the guide sleeve 40, and the outer periphery of the locking rod 41 is provided with a guide flange 48 that fits closely with the inner circular surface of the guide sleeve 40, and the compression spring 43 is clamped in Between the guide flange 48 and the limiting flange 47, a movable frame 49 is provided at the bottom of the lower pressure plate 3 and extends into the shell 4. The movable frame 49 and the lower pressure plate 3 are an integrated structure. A lock hole 50 is provided on the side of the movable frame 49. The inner diameter of the lock hole 50 is equivalent to the outer diameter of the lock rod 41. An outer hole 51 corresponding to the lock hole 50 is provided on the shell 4. The lock rod 41 passes through the outer hole 51 and cooperates with the lock hole 50. The outer end of the lock rod 41 is connected to the operating knob 42. The connection method is as follows: : The inner end of the operating knob 42 has a rectangular hole, and the outer end of the locking rod 41 has a rectangular protrusion that fits with the rectangular hole. The operating knob 42 drives the locking rod 41 to insert into or out of the locking hole 50. The ejection assembly 38 is arranged in the shell 4, and when the locking rod 41 is out of the locking hole 50, the ejection assembly 38 acts on the movable frame 49 to separate the shell 4 from the lower pressure plate 3. The bottom of the movable frame 49 is also provided with an ejection inclined surface 52 for pushing the locking rod 41 out when the movable frame 49 extends into the shell 4. This is the second connection method between the shell 4 and the lower pressure plate 3. When the operating knob 42 of the operating assembly 37 is in the initial position, the compression spring 43 acts on the guide flange 48 on the locking rod 41, causing the locking rod 41 to move inward and insert into the locking hole 50 of the movable frame 49 at the bottom of the lower pressure plate 3, thereby locking the shell 4 and the lower pressure plate 3. When the shell 4 needs to be disassembled, the locking rod 41 is driven outward by the operating knob 42, and the locking rod 41 is disengaged from the locking hole 50 of the movable frame 49 at the bottom of the lower pressure plate 3. At this time, under the action of the ejection assembly 38, the shell 4 automatically detaches from the lower pressure plate 3. During the detachment process of the shell 4, the locking rod 41 will abut against the surface of the movable frame 49, thereby achieving a damping and deceleration effect, preventing the shell 4 from detaching quickly and causing the staff to be unable to catch the shell 4 in time. This structure can not only achieve the locking of the shell 4 and the lower pressure plate 3, but also eliminate the hidden danger of loose connection caused by material aging caused by the first connection method, and has better structural reliability.

[0051] As attached Figure 10 、 12As shown in Figures 13 and 14, the lower end of the operating knob 42 is provided with a plurality of first arcuate protrusions 53 and first arcuate recesses 54 at intervals along the circumferential direction, and the upper end of the base 39 is provided with a plurality of second arcuate protrusions 55 and second arcuate recesses 56 at intervals along the circumferential direction, and the first arcuate protrusions 53 and second arcuate recesses 56 are matched with each other, and the first arcuate recesses 54 and second arcuate protrusions 55 are matched with each other. When the operating knob 42 is rotated, when the first arcuate protrusion 53 on the operating knob 42 is matched with the second arcuate recess 56 on the base 39, and the first arcuate recess 54 and second arcuate protrusion 55 are matched with each other, the locking rod 41 is inserted into the locking hole 50. When the first arcuate protrusion 53 on the operating knob 42 abuts the second arcuate protrusion 55 on the base 39, the locking rod 41 moves forward and disengages from the locking hole 50. Locking or unlocking is achieved by rotating the operating knob 42, which is very convenient to operate and has a more stable and reliable structure.

[0052] As attached Figure 10 As shown, the rear end of the guide sleeve 40 is provided with an annular flange 57 extending toward the periphery, and the rear end of the base 39 is provided with an annular groove 58 adapted to the annular flange 57. When the base 39 is installed, the guide sleeve 40 can be pressed and fixed, and the installation operation is very convenient.

[0053] As attached Figure 15 As shown, the ejection assembly 38 includes a sleeve 59, a push rod 60 and an ejection spring 61. The sleeve 59 is vertically integrated in the housing 4. The push rod 60 is vertically movable in the sleeve 59. The ejection spring 61 is arranged in the sleeve 59 and applies an upward spring force to the push rod 60, so that the upper end of the push rod 60 is tightly pressed against the lower end of the movable frame 49. The side of the sleeve 59 is provided with at least one sliding hole 62 extending vertically, and the sliding hole 62 is provided with a spring 61. 2 extends to the upper end of the sleeve 59. A slider 63 is provided on the side of the ejector rod 60, which engages with the slide hole 62. The slider 63 can be designed as a cylindrical shape. A damping protrusion 64 is provided on the inner wall of the slide hole 62 near the upper end, which serves to limit the upward travel of the slider 63. The damping protrusion 64 is hemispherical in shape. That is, a damping protrusion 64 is provided on both sides of the slide hole 62, and the distance between the two damping protrusions 64 is less than the diameter of the slider 63, thereby limiting the position of the slider 63. The extension and retraction of the ejector rod 60 is achieved by the change in the force applied to the ejector spring 61. When the movable frame 49 pushes the ejector rod 60 into the sleeve 59, the ejector spring 61 is compressed and accumulates energy. The moment the ejector rod 60 leaves the locking hole 50 of the movable frame 49, the ejector spring 61 releases the energy, pushing the movable frame 49 and the upper pressure plate 1 out. The shell 4, reacting to the reaction force, also moves away from the upper pressure plate 1, facilitating the removal of the shell 4.

Claims

1. A high-stability low-pressure tensioner, comprising an upper pressure plate (1), a middle pressure plate (2), a lower pressure plate (3) and a shell (4), wherein two screw rods (5) are symmetrically arranged at the bottom of the upper pressure plate (1), and two middle holes (6) and a lower hole (7) are respectively provided on the middle pressure plate (2) and the lower pressure plate (3), wherein the screw rods (5) pass through the middle holes (6) and the lower holes (7) in sequence, and the screw rods (5) are threadedly connected with a locking nut (8) at a position corresponding to the lower part of the lower pressure plate (3), and the shell (4) is detachably mounted on the lower end of the lower pressure plate (3) and covers the bottom of the screw rods (5) and the locking nut (8) inside; and the characteristics are: The invention also includes a pre-tightening mechanism (9) provided on both sides of the lower pressure plate (3) and respectively matched with the two screw rods (5), the pre-tightening mechanism (9) includes a pre-tightening knob (10), a follower block (11) and a pre-tightening sleeve (12), the pre-tightening sleeve (12) is installed on the outer periphery of the screw rod (5), and the side of the pre-tightening sleeve (12) is evenly provided with a plurality of bevel teeth (13) with a horizontal upper end and an inclined lower end in the vertical direction, and a truncated cone portion (14) is provided on both sides of the lower pressure plate (3), and the outer end of the truncated cone portion (14) is opened. A movable cavity (15) is provided, and a guide hole (16) with a rectangular cross section and connected to the lower hole (7) is opened at the inner end of the movable cavity (15). The pre-tightening knob (10) is rotatably connected to the outer end of the truncated cone portion (14). The follower block (11) is arranged in the movable cavity (15), and rotating the pre-tightening knob (10) can drive the follower block (11) to slide axially. The follower block (11) is provided with a locking protrusion (17) that passes through the guide hole (16) and extends into the lower hole (7) and cooperates with the bevel tooth (13).

2. A high-stability low-pressure tensioner according to claim 1, characterized in that: The pre-tightening mechanism (9) further comprises four first magnets (18) and four second magnets (19); the inner end of the pre-tightening knob (10) is provided with four first mounting grooves (20) in a circumferential array; the four first magnets (18) are respectively embedded in the four first mounting grooves (20); and the magnetic poles of each two adjacent first magnets (18) are arranged in opposite directions; a plurality of hemispherical first damping protrusions (21) are provided on the inner wall of the first mounting groove (20) near the outer end for confining the first magnet (18) in the first mounting groove (20); the follower block ( 11) Four second mounting grooves (22) are distributed in a circular array at the outer end, and four second magnets (19) are respectively embedded in the four second mounting grooves (22), and the magnetic poles of each two adjacent second magnets (19) are arranged in opposite directions. A plurality of hemispherical second damping protrusions (23) are provided on the inner wall of the second mounting groove (22) near the outer end for confining the second magnet (19) in the second mounting groove (22); when the preload knob (10) is rotated, all the first magnets (18) and the corresponding second magnets (19) are in a state of mutual attraction or mutual repulsion.

3. A high-stability low-pressure tensioner according to claim 2, characterized in that: The pre-tightening mechanism (9) further includes a pre-tightening spring (24), the inner end of the pre-tightening knob (10) is provided with a first spring slot (25), the outer end of the follower block (11) is provided with a second spring slot (26), and the two ends of the pre-tightening spring (24) are respectively embedded in the first spring slot (25) and the second spring slot (26).

4. The high-stability low-pressure tensioner according to claim 2, characterized in that: Two hemispherical positioning protrusions (27) are provided on the inner circular surface of the pre-tightening knob (10), and two arc-shaped guide grooves (28) for sliding positioning of the positioning protrusions (27) are provided on the outer circular surface of the truncated cone portion (14), and the circular angle corresponding to the extension trajectory of the arc-shaped guide groove (28) is 90 degrees, and two ends of the arc-shaped guide groove (28) are respectively provided with two suction positioning grooves (29) and separation positioning grooves (30) for the positioning protrusions (27) to be embedded, and the depth of the arc-shaped guide groove (28) is smaller than the suction positioning groove (29) and the separation positioning groove (30).

5. The high-stability low-pressure tensioner according to claim 1, characterized in that: The side of the pre-tightening sleeve (12) is provided with a screw hole (31) in the radial direction, and the side of the screw rod (5) is provided with a slot (32) corresponding to the screw hole (31). The screw hole (31) is threadedly connected with a hexagonal screw (33), and the inner end of the hexagonal screw (33) is inserted into the slot (32).

6. The high-stability low-pressure tensioner according to claim 1, characterized in that: The outer side of the lower pressing plate (3) is provided with a plurality of card slots (34), and the inner side of the shell (4) is provided with a plurality of card blocks (35) that fit with the card slots (34).

7. The high-stability low-pressure tensioner according to claim 1, characterized in that: The invention also includes a locking mechanism (36) for locking the housing (4), wherein the locking mechanism (36) includes an operating assembly (37) and an ejection assembly (38), wherein the operating assembly (37) includes a base (39), a guide sleeve (40), a locking rod (41), an operating knob (42) and a compression spring (43), and a positioning groove (44) is provided at the front of the housing (4), wherein the base (39) is fixedly installed in the positioning groove (44), and the positioning groove (44) The inner wall is provided with a directional recess (45), the base (39) is provided with a directional protrusion (46) that fits with the directional recess (45), the guide sleeve (40) is fixedly installed in the base (39), the front end of the guide sleeve (40) is provided with a limiting flange (47) extending inward, the locking rod (41) passes through the guide sleeve (40), and the outer periphery of the locking rod (41) is provided with a guide flange (48) that fits tightly with the inner surface of the guide sleeve (40). ), the compression spring (43) is sandwiched between the guide flange (48) and the limit flange (47), the bottom of the lower pressure plate (3) is provided with a movable frame (49) extending into the shell (4), the side of the movable frame (49) is provided with a lock hole (50), the shell (4) is provided with an outer hole (51) corresponding to the lock hole (50), the lock rod (41) passes through the outer hole (51) and cooperates with the lock hole (50), the outer end of the lock rod (41) is in contact with the operating knob (42 ) are connected, the operating knob (42) drives the locking rod (41) to be inserted into or out of the locking hole (50), the ejection assembly (38) is arranged in the housing (4), and when the locking rod (41) is out of the locking hole (50), the ejection assembly (38) acts on the movable frame (49) to make the housing (4) separate from the lower pressure plate (3), and the bottom of the movable frame (49) is also provided with an ejection inclined surface (52) for pushing the locking rod (41) out when the movable frame (49) is extended into the housing (4).

8. The high-stability low-pressure tensioner according to claim 7, characterized in that: The lower end of the operating knob (42) is provided with a plurality of first arc-shaped protrusions (53) and first arc-shaped recesses (54) at intervals along the circumferential direction, and the upper end of the base (39) is provided with a plurality of second arc-shaped protrusions (55) and second arc-shaped recesses (56) at intervals along the circumferential direction, and the first arc-shaped protrusions (53) and the second arc-shaped recesses (56) are matched with each other, and the first arc-shaped recesses (54) and the second arc-shaped protrusions (55) are matched with each other.

9. The high-stability low-pressure tensioner according to claim 7, characterized in that: The rear end of the guide sleeve (40) is provided with an annular flange (57) extending toward the outer periphery, and the rear end of the base (39) is provided with an annular groove (58) adapted to the annular flange (57).

10. The high-stability low-pressure tensioner according to claim 7, characterized in that: The ejection assembly (38) includes a sleeve (59), a push rod (60) and an ejection spring (61). The sleeve (59) is vertically integrated in the housing (4). The push rod (60) is vertically movable in the sleeve (59). The ejection spring (61) is arranged in the sleeve (59) and applies an upward spring force to the push rod (60), so that the upper end of the push rod (60) is tightly abutted against the lower end of the movable frame (49). The side of the sleeve (59) is provided with at least one sliding hole (62) extending vertically, and the sliding hole (62) extends to the upper end of the sleeve (59). The side of the push rod (60) is provided with a slider (63) matched with the sliding hole (62). The inner wall of the sliding hole (62) is provided with a damping protrusion (64) near the upper end for constituting an upper stroke limit for the slider (63). The damping protrusion (64) is hemispherical.

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