Closed pyramid sleeve jaw winding drum and operation method thereof

Abstract

The invention discloses a closed pyramid sleeve jaw winding drum which comprises a main shaft, a pyramid sleeve, a pull rod, a side disc, a fixed sector plate group and a collapsible sector plate group, wherein the fixed sector plate group and the collapsible sector plate group are alternately arranged in the circumferential direction. And the fixed sector plate group comprises two fixed sector plates which are rigidly connected with the side disc. The collapsible fan-shaped plate group comprises two collapsible fan-shaped plates I and a collapsible fan-shaped plate II, and is in sliding connection with the side disc through a T-shaped block. An expansion inclined plane is arranged outside the pyramid sleeve to drive the expansion sector plate to radially move. The closed structure assembly is arranged between the collapsible sector plates and comprises a closed axial wedge fixed to the pyramid sleeve and a closed radial wedge matched with the closed axial wedge, and the closed radial wedge is axially limited by the side disc and the protection plate. The double-jaw assembly is arranged between the fixed sector plates and comprises a jaw radial wedge, a jaw axial wedge matched with the jaw radial wedge, a spring push rod, a traction plate and a secondary clamp hinged to the fixed sector plates. When the winding drum is expanded, a completely-closed cylindrical surface is formed, gaps are eliminated, and strip indentation and foreign matter invasion are avoided; the service life is prolonged; and the maintenance cost and the fault rate are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cold-rolled strip coiling equipment, and in particular to a closed pyramid jaw reel and an operating method thereof. Background Art

[0002] Cold-rolled coils, key equipment in strip production lines, possess diverse and generally complex structures. Among them, the pyramidal sleeve coil consists primarily of core components: a main shaft, tie rods, sector plates, and a pyramidal sleeve. Its basic operating principle is that the tie rods drive the pyramidal sleeve axially, while the inclined surfaces of the sleeve drive the sector plates radially, expanding them. Furthermore, the pyramidal sleeve is typically designed with a specifically inclined hook structure that engages with a corresponding beveled hook inside the sector plates, pulling the sector plates radially inward when the pyramidal sleeve moves in the opposite direction.

[0003] However, due to its specific structural principle, the pyramid sleeve reel has several technical difficulties and limitations in application.

[0004] First, there are limitations in jaw design. This structure often makes it difficult to integrate complex mechanical jaws. Winding operations often rely on external belt assistance or the use of hydraulic jaws. Hydraulic jaw solutions require precision-machined cavities within the sector plates to accommodate the hydraulic cylinders, requiring extremely high manufacturing and assembly precision. Furthermore, there is a risk of seal failure in the hydraulic system. Leakage could result in oil contamination of the strip surface or the production environment.

[0005] Secondly, there's a risk of weakening and failing clamping capacity. The jaws of these reels are typically designed to only clamp the strip, specifically the strip head, once. Over extended periods of continuous operation, the jaws are susceptible to wear, leading to a gradual decrease in clamping force. In severe cases, the strip may become loosely clamped or even pulled out of the jaws, a phenomenon commonly known as strip pullout, directly impacting production safety and efficiency.

[0006] Third, insufficient drum closing precision can easily lead to the intrusion of foreign matter. When the drum expands to its maximum operating diameter, forming a perfect circle, it's difficult for adjacent sectors to form a completely continuous, closed cylindrical surface, and gaps inevitably exist. These gaps can imprint the strip surface during the winding process, creating indentations and seriously affecting the quality of the coil, particularly the core. Furthermore, foreign matter from the production line, such as iron oxide scale or coolant impurities, can easily fall through these gaps into the drum, causing mechanical jams and significantly shortening the equipment's lifespan.

[0007] Fourth, complex kinematic relationships create component reliability challenges. The expansion and contraction of the drum requires relative displacement of all the sector plates. This complex relative motion leads to a relatively high failure rate for the drum's internal components, especially the sector plates that serve as the jaw carriers. These sectors are typically more complex and relatively weak, resulting in a shorter service life than other sector plates due to repeated movement.

[0008] To address the above issues, relevant technologies have been explored. For example: Chinese patent document CN216175443U discloses a pyramidal sleeve winder with jaws. This solution utilizes a combination of a spindle sector plate, jaw sector plate pull rod, pyramid sleeve plate key clamping device, and a spring mechanism to achieve both basic expansion and contraction while also utilizing a spring to push the jaw bevel mechanism for mechanical clamping. This design avoids leakage issues associated with hydraulic jaws, but its improvements primarily focus on the jaw structure itself. This relatively complex structure requires improved controllability, and it fails to effectively address structural issues such as the high overall failure rate of indentations caused by gaps between the sector plates.

[0009] Chinese patent document CN222766958U discloses a pyramid sleeve reel with mechanical jaws. The structure includes an extended shaft head support, a main shaft, a pyramid sleeve, a guide key, a fan-shaped plate, a fan-shaped plate, a hollow sleeve, an inclined wedge, a jaw strip, a two-stroke cylinder, and a four-channel rotary joint. It introduces hydraulic oil through the rotary joint to drive the two-stroke cylinder, which in turn pushes the hollow sleeve and the inclined wedge to move axially, converting the axial displacement into radial movement of the jaw strip to achieve clamping and loosening. Although it is called a mechanical jaw, its core action still relies on a hydraulic actuator, namely a two-stroke cylinder, which fails to overcome the high cost and potential leakage risks inherent in the hydraulic system. In addition, the jaw strip parts in this design are not strong enough, and there is a risk of breakage.

[0010] Chinese patent document CN219944182U discloses a pyramidal sleeve-type reel. Its main components include a main shaft tie rod, a sector plate, a pyramidal sleeve, a thrust ring, a profile block, a dovetail key, and a dustproof device. Its expansion and contraction principle is similar to that of conventional structures, with the main improvement being that when adjacent sectors expand, staggered baffles attempt to cover the gaps created by expansion, preventing dust, rust, and other foreign matter from entering the reel. However, the dustproof device itself is easily damaged, making repair difficult and inconvenient.

[0011] It's important to note that none of the aforementioned patented solutions effectively address the critical technical challenge of pyramidal sleeve reels, which suffer from indentations on the coiled strip caused by the inevitable gaps between adjacent sector plates when in a perfect circular state, thus affecting the coil shape. Therefore, for pyramidal sleeve reels, finding a comprehensive solution that simultaneously overcomes or significantly improves the core drawbacks of hydraulic system leakage, jaw clamping force loss, foreign matter intrusion through sector plate gaps, and the high failure rate of indentations, while also offering a rational structure and ease of maintenance, is of great practical significance. Summary of the Invention

[0012] In response to the above technical problems in the related art, the present invention proposes a closed pyramid sleeve jaw reel and an operating method thereof, which can overcome the above-mentioned shortcomings of the prior art.

[0013] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: A closed pyramid sleeve jaw reel; The closed pyramid sleeve jaw reel comprises a main shaft, a pyramid sleeve coaxially sleeved on the outside of the main shaft, a pull rod for driving the pyramid sleeve to move axially, a side disc fixed at the main shaft diameter, and a fixed sector plate group and an expansion and contraction sector plate group alternately arranged along the circumferential direction; the fixed sector plate group comprises a fixed sector plate 1 and a fixed sector plate 2 rigidly connected to the side disc; the expansion and contraction sector plate group comprises two expansion and contraction sector plates 1 and one expansion and contraction sector plate 2 arranged in a mirror image, and the three are radially slidably connected to the sliding grooves of the side discs through T-shaped blocks respectively; the outer surface of the pyramid sleeve is provided with an expansion and contraction inclined surface that cooperates with the inner inclined surfaces of the expansion and contraction sector plates 1 and 2, and drives the expansion and contraction sector plate group to expand and contract radially when moving axially; It also includes a closed structure component and a double jaw component. The closed structure component is arranged between adjacent expansion and contraction sector plates, and includes a closed axial wedge fixed to the pyramid sleeve and a closed radial wedge matched with its dovetail bevel. The two sides of the closed radial wedge are restricted by side plates and protective plates; the double jaw component is arranged between fixed sector plate one and fixed sector plate two, and includes a radially movable jaw radial wedge, a jaw axial wedge matched with its dovetail bevel, a spring and a traction plate for driving the jaw axial wedge, and a secondary clamp hinged to fixed sector plate two.

[0014] Furthermore, the traction plate is fixedly connected to the pyramid sleeve, and the jaws are linked to the axial wedge through a spring guide rod, and the secondary clamp is connected to the spring reset device through a spherical concave block and a spherical convex block.

[0015] Furthermore, in the closed structural component, the two sides of the closed radial wedge are respectively restricted by the side disc and the ordinary protective plate 1 and the ordinary protective plate 2, and the axial displacement is converted into radial displacement through the inclined surface.

[0016] Furthermore, the radial wedges of the jaws of the double jaw assembly are restricted on both sides by the side plates and the jaw protection plates, and their radial displacement is achieved by the axial displacement of the jaws' axial wedges through the inclined surface conversion.

[0017] Furthermore, the secondary clamp is hinged in the semicircular hole of the second fixed sector plate, and its bottom is connected to the spring reset device through multiple groups of spherical concave blocks and spherical convex blocks, so that the spring reset device always provides reset force vertically.

[0018] Furthermore, the spring guide rod passes through the traction plate and is fixed to the jaw axial wedge. The spring is sleeved on the spring guide rod and its two ends respectively press against the jaw axial wedge and the traction plate. A limiting nut is provided at the end of the spring guide rod.

[0019] Furthermore, the fixed sector plate 1 and the fixed sector plate 2 are slidably connected to the pyramid sleeve via a dovetail key, and the ends are rigidly fixed to the side plate plane via screws.

[0020] Furthermore, the T-shaped blocks of the first and second expansion and contraction sector plates are clearance-matched with the sliding grooves of the side plates, limiting their movement to radial direction only.

[0021] In another aspect, the present invention provides a method for operating a closed pyramid sleeve jaw roll; The method for operating the closed pyramid sleeve jaw reel comprises the following steps: Steps for expanding the roll and clamping the jaws: The pull rod moves leftwards to drive the pyramid sleeve to move leftwards, and the expansion and contraction sector plate group is pushed up by the expansion and contraction inclined surface to expand radially; The pyramid sleeve drives the closed axial wedge to move leftward, pushing the closed radial wedge to expand radially and enlarge the closed gap; The pyramid sleeve drives the traction plate to move left to compress the spring, pushing the axial wedge of the jaws to move left, and then drives the radial wedge of the jaws to move upward through the inclined surface to clamp the strip, and pushes the secondary clamp to rotate to complete the secondary clamping; Steps for reducing the roll and opening the jaws: The rightward movement of the pull rod drives the pyramid sleeve to move rightward, and the expansion and contraction sector plate group is pulled back by the expansion and contraction inclined surface to reduce in radial direction; The pyramid sleeve drives the closed axial wedge to move rightward, and pulls back the closed radial wedge to reduce its radial size; The traction plate moves right and disengages from the spring, contacting the limit nut, pulling the axial wedge of the jaws to the right, pulling the radial wedge of the jaws back through the inclined surface and moving it downward to open the jaws. At the same time, the spring reset device pulls back the secondary clamp.

[0022] The beneficial effects of the present invention are as follows: a structure combining a fixed sector plate and an expansion and contraction sector plate is set up and a closed wedge assembly is introduced, so that the reel can form a completely closed cylindrical surface when it expands, eliminating the gap between adjacent sector plates, avoiding indentations on the strip and preventing foreign matter from invading the interior; at the same time, a double-jaw design is adopted, in which the fixed jaw sector plate cooperates with a spring-driven wedge mechanism to achieve primary clamping, and is combined with a rotatable secondary clamp to form a secondary clamp, which significantly improves the clamping reliability and prevents the belt pulling phenomenon under the condition of no hydraulic system, thereby achieving the comprehensive effect of improving the surface quality of the strip roll, extending the equipment life, and reducing maintenance costs and failure rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a cross-sectional view of the overall structure of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 2 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 1 The cross-section of the middle BB is in an enlarged state; Figure 3 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 2 A partial enlarged view of point a in the middle (the jaws are clamped, and the strip is inserted into the jaws and clamped); Figure 4 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 1 The X-axis view is enlarged; Figure 5 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 1 The cross-section of AA in the middle is in the expanded state; Figure 6 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 2 The cross-section of the middle CC is in a reduced state; Figure 7 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 1 The cross-section of the middle BB is in a reduced state; Figure 8 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 7 A partial enlarged view of point b in the middle (the jaws are open, waiting for the strip to be inserted into the jaws); Figure 9 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 1 The X-axis view is zoomed out; Figure 10 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 1 The cross-section of the middle AA is in a zoomed-out state; Figure 11 The invention relates to a closed pyramid sleeve jaw reel according to an embodiment of the present invention. Figure 2 Cross-sectional view of the middle DD; Figure 12 This is a first perspective perspective view of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 13 is a second perspective view of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 14 3. A first perspective view of a pyramid sleeve of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 15 is a second perspective view of a pyramid sleeve of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 16 is a perspective view of a closed radial wedge of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 17 3D diagram of a closed axial wedge of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 18 This is a three-dimensional diagram of an expansion and contraction sector plate 1 of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 19 This is a three-dimensional diagram of the expansion and contraction sector plate 2 of the closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 20 This is a perspective view of a second fixed sector plate of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 21 This is a partial side view of a second fixed sector plate of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 22 This is a perspective view of a fixed sector plate 1 of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 23 is a perspective view of a secondary clamp for a closed pyramid jaw reel according to an embodiment of the present invention; Figure 24This is a three-dimensional diagram of the axial wedge of the jaws of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 25 3D diagram of a radially inclined wedge of a jaw of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 26 is a perspective view of a T-shaped block of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 27 is a perspective view of a side disk of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 28 is a three-dimensional diagram of a spherical concave block of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; Figure 29 is a three-dimensional diagram of a spherical protrusion of a closed pyramid sleeve jaw reel according to an embodiment of the present invention; In the figure: 1, side plate; 2, radial wedge of jaws; 3, axial wedge of jaws; 3a, dovetail bevel of axial wedge of jaws; 3b, hook of tail of axial wedge of jaws; 4, main shaft; 5, pull rod; 6, pyramid sleeve; 6a, expansion and contraction bevel; 6b, hook of bevel; 7, pull key; 8, spring; 9, spring guide rod; 10, traction plate; 11, expansion and contraction sector plate 1; 12, fixed sector plate 1; 13, dovetail key; 14, Fixed sector plate 2; 15. Closed axial wedge; 15a. Closed axial wedge slope; 15b. Closed axial wedge hook; 16. Closed radial wedge; 17. Expansion sector plate 2; 18. Sliding key; 19. Secondary clamp; 20. Spherical concave block; 21. Spherical convex block; 22. Spring return device; 23. Jaw protection plate; 24. Ordinary protection plate 1; 25. Ordinary protection plate 2; 26. T-block. DETAILED DESCRIPTION

[0025] 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0026] It should be understood that in the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the embodiments of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0027] like Figures 1 to 29 As shown, a closed pyramid sleeve jaw reel according to an embodiment of the present invention comprises a main shaft 4, a pyramid sleeve 6 coaxially sleeved on the outside of the main shaft 4, a pull rod 5 for driving the pyramid sleeve 6 to move axially, a side disc 1 fixed at the axial diameter of the main shaft 4, and a fixed sector plate group and an expansion and contraction sector plate group alternately arranged along the circumferential direction; the fixed sector plate group comprises a fixed sector plate 12 and a fixed sector plate 2 14 rigidly connected to the side disc 1; the expansion and contraction sector plate group comprises two expansion and contraction sector plates 11 and one expansion and contraction sector plate 2 17 arranged in a mirror image, and the three are radially slidably connected to the sliding groove of the side disc 1 through a T-block 26 respectively; the outer surface of the pyramid sleeve 6 is provided with an expansion and contraction inclined surface 6a that cooperates with the inner inclined surfaces of the expansion and contraction sector plates 11 and the expansion and contraction sector plates 2 17, which drives the expansion and contraction sector plate group to expand and contract radially when moving axially; It also includes a closed structure component and a double jaw component. The closed structure component is arranged between adjacent expansion and contraction sector plates, and includes a closed axial wedge 15 fixed to the pyramid sleeve 6 and a closed radial wedge 16 matched with its dovetail bevel. The closed radial wedge 16 is restricted on both sides by the side plate 1 and the protective plate; the double jaw component is arranged between the fixed sector plate 1 12 and the fixed sector plate 2 14, and includes a radially movable jaw radial wedge 2, a jaw axial wedge 3 matched with its dovetail bevel, a spring 8 and a traction plate 10 for driving the jaw axial wedge 3, and a secondary clamp 19 hinged to the fixed sector plate 2 14.

[0028] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, the traction plate 10 is fixedly connected to the pyramid sleeve 6, and the jaw axial wedge 3 is linked through the spring guide rod 9, and the secondary clamp 19 is connected to the spring reset device 22 through the spherical concave block 20 and the spherical convex block 21.

[0029] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, in the closed structural component, the two sides of the closed radial wedge 16 are respectively restricted by the side plate 1 and the ordinary protective plate 1 24 and the ordinary protective plate 2 25, and the axial displacement is converted into radial displacement through the inclined surface.

[0030] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, the jaw radial wedge 2 of the double jaw assembly is restricted on both sides by the side plate 1 and the jaw protection plate 23, and its radial displacement is achieved by the axial displacement of the jaw axial wedge 3 through the inclined surface conversion.

[0031] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, the secondary clamp 19 is hinged in the semicircular hole of the fixed sector plate 2 14, and its bottom is connected to the spring reset device 22 through multiple groups of spherical concave blocks 20 and spherical protrusions 21, so that the spring reset device 22 always provides a reset force vertically.

[0032] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, the spring guide rod 9 passes through the traction plate 10 and is fixed to the jaw axial wedge 3, the spring 8 is sleeved on the spring guide rod 9 and its two ends respectively press against the jaw axial wedge 3 and the traction plate 10, and a limiting nut 27 is provided at the end of the spring guide rod 9.

[0033] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, the fixed sector plate 12 and the fixed sector plate 2 14 are slidingly connected to the pyramid sleeve 6 through a dovetail key 13, and the ends are rigidly fixed to the plane of the side plate 1 by screws.

[0034] According to a closed pyramid sleeve jaw reel described in an embodiment of the present invention, in a specific embodiment, the T-blocks 26 of the expansion and contraction sector plate 11 and the expansion and contraction sector plate 2 17 are clearance-matched with the sliding grooves of the side disc 1, limiting their radial movement only.

[0035] In addition, according to an embodiment of the present invention, a method for operating a closed pyramid sleeve jaw reel specifically includes the following steps: Steps for expanding the roll and clamping the jaws: The pull rod 5 moves leftwards to drive the pyramid sleeve 6 to move leftwards, and the expansion and contraction sector plate group is pushed up by the expansion and contraction inclined surface 6a to expand radially; The pyramid sleeve 6 drives the closed axial wedge 15 to move leftward, pushing the closed radial wedge 16 to expand radially to close the gap; The pyramid sleeve 6 drives the traction plate 10 to move left to compress the spring 8, pushing the jaw axial wedge 3 to move left, driving the jaw radial wedge 2 to move upward through the inclined surface to clamp the strip, and pushing the secondary clamp 19 to rotate to complete the secondary clamping; Steps for reducing the roll and opening the jaws: The pull rod 5 moves rightwards to drive the pyramid sleeve 6 to move rightwards, and the expansion and contraction sector plate group is pulled back through the expansion and contraction inclined surface 6a to reduce in radial direction; The pyramid sleeve 6 drives the closed axial wedge 15 to move rightward, and pulls back the closed radial wedge 16 to reduce in radial direction; The traction plate 10 moves rightward and disengages from the spring 8, contacting the limit nut 27, pulling the axial wedge 3 of the jaws to the right, pulling back the radial wedge 2 of the jaws through the inclined surface and moving it downward to open the jaws, while the spring reset device 22 pulls back the secondary clamp 19.

[0036] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0037] During specific use, a closed pyramid sleeve jaw reel according to the present invention includes a side plate 1, a jaw radial oblique wedge 2, a jaw axial oblique wedge 3, a main shaft 4, a pull rod 5, a pyramid sleeve 6, a pull key 7, a spring 8, a spring guide rod 9, a traction plate 10, an expansion and contraction sector plate 11, a fixed sector plate 12, a dovetail key 13, a fixed sector plate 2 14, a closed axial oblique wedge 15, a closed radial oblique wedge 16, an expansion and contraction sector plate 2 17, a sliding key 18, a secondary clamp 19, a spherical concave block 20, a spherical protrusion 21, a spring reset device 22, a jaw protection plate 23, an ordinary protection plate 1 24, an ordinary protection plate 2 25, a T-block 26, and a limit nut 27.

[0038] The side disc 1 is fixed to the axis diameter of the main shaft 4 by means of a key and a locking nut. The end face of the side disc 1 has sliding grooves on three sides, and the other side is a flat surface with a waist hole for bolts.

[0039] The jaw radial wedge 2 and the jaw axial wedge 3 are matched through dovetail bevels, and are placed between the fixed sector plate 12, the fixed sector plate 2 14 and between the side plate 1 and the jaw protection plate 23, and can move radially and clamp the strip.

[0040] The jaw axial wedge 3 is installed in the groove of the pyramid sleeve 6 and can move axially.

[0041] The main shaft 4 is supported by the main body of the equipment.

[0042] The pull rod 5 is placed in the inner hole of the main shaft 4 and can move axially through an external power source.

[0043] The pyramid sleeve 6 is matched with the outer circle of the main shaft through the inner hole and can move axially.

[0044] The pull key 7 connects the pull rod 5 and the pyramid sleeve 6 into a whole so as to move axially on the main shaft 4.

[0045] The spring 8 is placed on the spring guide rod 9, with one end close to the jaw axial wedge 3 and the other end close to the traction plate 10, a total of two places, providing jaw clamping force.

[0046] The spring guide rod 9 is fixed to the end of the jaw axial wedge 3 by a thread, passes through the hole on the traction plate 10, and moves axially with the jaw axial wedge 3, with a total of 2 locations.

[0047] The pulling plate 10 is fixed to the end of the pyramid sleeve 6 .

[0048] The expansion and contraction sector plate 11 cooperates with the pyramid sleeve 6 through the inclined surface, and a T-block 26 is installed on one end face to cooperate with the sliding groove of the side plate 1. The other end face is installed with an ordinary protective plate 24, which can move radially. The left and right pieces are arranged in mirror images, with a total of 2 pieces.

[0049] The fixed sector plate 12 is matched with the pyramid sleeve 6 through a dovetail key 13, one end face is fixed to the plane of the side plate 1 by screws, and a jaw protection plate 23 is installed on the side of the other end.

[0050] The dovetail key 13 is fixed to the pyramid sleeve 6 by screws.

[0051] The fixed sector plate 2 14 is matched with the pyramid sleeve 6 through the dovetail key 13, and one end face is fixed to the side plate 1 plane by screws, and the other end side is installed with a jaw protection plate 23. There is a semicircular hole in the middle to place the secondary clamp 19, and a waist-shaped hole on the bottom to place the spring reset device 22.

[0052] The closed axial wedge 15 is fixed in the positioning groove of the pyramid sleeve 6 by screws, and there are two pieces in total.

[0053] The closed radial wedge 16 and the closed axial wedge 15 are matched through the inclined surface, and are placed between the expansion and contraction sector plate 11, the expansion and contraction sector plate 2 17 and between the side plate 1, the ordinary protective plate 1 24, and the ordinary protective plate 2 25, and can move radially, with a total of 2 pieces.

[0054] The expansion and contraction sector plate 2 17 cooperates with the pyramid sleeve 6 through the inclined surface, and a T-block 26 is installed on one end face to cooperate with the sliding groove of the side plate 1, and an ordinary protective plate 25 is installed on the other end face, which can move radially and has only one piece.

[0055] The sliding key 18 is fixed on the main shaft 4 to guide and prevent rotation.

[0056] The secondary clamp 19 is hingedly placed in the semicircular hole of the second fixed sector plate 14, can rotate around the center of the semicircular hole, and can clamp the strip.

[0057] The spherical concave block 20 is fixedly placed in the secondary clamp 19 .

[0058] The spherical convex block 21 matches the spherical concave block 20 through the spherical surface and can rotate.

[0059] The spring return device 22 is placed in the waist-shaped hole on the bottom surface of the second fixed sector plate 14, and can pull the secondary clamp 19 back to its original position through the spherical protrusion 21 and the spherical concave block 20.

[0060] The jaw protection plate 23 is fixed to the fixed sector plate 1 12 and the fixed sector plate 2 14 by screws.

[0061] The ordinary protective plate 24 is fixed to the fixed sector plate 12 by screws, and there are two pieces in total.

[0062] The ordinary protective plate 25 is fixed to the fixed sector plate 2 14 by screws, and there is only one piece.

[0063] The T-shaped block 26 is fixed on the expansion and contraction sector plate 1 11 and the expansion and contraction sector plate 2 17 to guide, limit and prevent rotation.

[0064] The limit nut 27 is fixed on the appropriate position of the spring guide rod 9 and is used to adjust the opening degree of the jaws.

[0065] The specific working principle of the roll expansion-closed structure jaw clamping operation is as follows: 1: The expansion and contraction fan-shaped plate expands - the roll expands; The pull rod 5 moves to the left under the influence of an external power source, and the pull rod 5 drives the pyramid sleeve 6 to move to the left together through the pull key 7. The pyramid sleeve 6 lifts up two expanding and contracting fan plates 11 and one expanding and contracting fan plate 2 17 through three inclined surfaces. Since the sides of the expanding and contracting fan plates 11 and the expanding and contracting fan plates 2 17 are respectively connected and fastened to the T-block 26, the expanding and contracting fan plates 11 and the expanding and contracting fan plates 2 17 can only slide radially against the side plate 1 through the T-block 26. At this time, the expanding and contracting fan plates move upward and expand.

[0066] Since the fixed sector plates 12 and 14 are rigidly connected to the side plate 1 by screws, when the pyramid sleeve 6 moves axially, the fixed sector plates 12 and 14 only slide relative to each other on the large plane of the pyramid sleeve 6 through the dovetail key 13, and the fixed sector plates will not expand or shrink and will not move axially.

[0067] Therefore, the three expanding and contracting fan-shaped plates will expand, while the two fixed fan-shaped plates will not change, thus causing the roll to expand.

[0068] 2: The closed radial wedge expands to form a closed structure; At the same time, since the pyramid sleeve 6 moves to the left, the pyramid sleeve 6 moves to the left with the closed axial wedge 15. The closed axial wedge 15 cooperates with the closed radial wedge 16 through the inclined surface. The closed radial wedge 16 is blocked on both sides by the side plate 1 and the ordinary protective plate 1 24 and the ordinary protective plate 2 25, limiting the axial movement to radial movement. Therefore, the closed axial wedge 15 moves to the left and pushes the closed radial wedge 16 to move radially upward and expand through the inclined surface.

[0069] 3: Jaw clamping - clamping and coiling; At the same time, since the pyramid sleeve 6 moves to the left, the traction plate 10 fixed thereon will also move to the left. The opening on the traction plate 10 is larger than the spring guide rod 9. The traction plate 10 will pass through the spring guide rod 9 and then compress the spring 8 and then push the jaw axial wedge 3 to move to the left. The jaw axial wedge 3 cooperates with the jaw radial wedge 2 inclined surface. The jaw radial wedge 2 is blocked on both sides by the side plate 1 and the jaw guard plate 23, limiting the axial movement to radial movement. Therefore, the jaw axial wedge 3 moves to the left and pushes the jaw radial wedge 2 to move radially upward through the inclined surface until it hits the fixed sector plate 12, forming a jaw clamping.

[0070] At the same time, when the radial wedge 2 of the jaws moves radially upward, it will push the secondary clamp 19 to rotate clockwise around the hinge point. Since the angle of the secondary clamp 19 is different each time during the rotation process, multiple groups of spherical concave blocks 20 and spherical convex blocks 21 are provided in the secondary clamp 19 to solve the problem that the spring reset device 22 is always in a vertical state. When the secondary clamp 19 hits the fixed sector plate 12, the secondary jaws are clamped.

[0071] The above actions occur simultaneously to complete the operation process.

[0072] More specifically, the present invention discloses a closed pyramid jaw reel, which includes three main motion relationships: 1: The expansion and contraction of the reel is produced by the expansion and contraction sector plate group including two expansion and contraction sector plates 11 and one expansion and contraction sector plate 2 17 and the inclined surface and hook of the pyramid sleeve 6, and the inclined surface angle is R.

[0073] The expansion of the reel is caused by the expansion and contraction inclined surface 6a on the pyramid sleeve 6 pushing up the expansion and contraction sector plate group, thereby the reel expands.

[0074] When the reel is reduced, the bevel hook 6b on the pyramid sleeve 6 pulls back the expansion and contraction sector plate group to reduce the reel.

[0075] Second: The expansion and contraction of the closed structural component is caused by the fixed closed axial inclined wedge 15 and the moving closed radial inclined wedge 16 inclined surface and hook head, and the inclined surface angle is S.

[0076] The closed structure expands and the closed radial wedge 16 is lifted up by the closed axial wedge inclined surface 15a on the closed axial wedge 15, thereby expanding to form a closed outer circle.

[0077] The closed structure is reduced by pulling back the closed radial wedge 16 by the closed axial wedge hook 15b on the closed axial wedge 15, thereby making room for the expansion and contraction sector plate group to be reduced.

[0078] 3: The clamping and opening of the jaw assembly is produced by the inclined surfaces and hooks of the jaw axial wedge 3 and the jaw radial wedge 2, and the inclined surface angle is T.

[0079] The jaw assembly is clamped by the jaw axial wedge dovetail inclined surface 3a on the jaw axial wedge 3 lifting the jaw radial wedge 2, thereby expanding and clamping.

[0080] The jaw assembly opens by pulling back the jaw radial wedge 2 on the jaw axial wedge 3, thereby expanding and opening the jaw assembly.

[0081] Logical relationship of the bevel angle: In order to ensure that the roll can expand and contract at the same time and the jaws can be clamped and opened, the angular relationship between the bevel angle R, bevel angle S and bevel angle T must meet the following requirements: bevel angle R < bevel angle S < bevel angle T, thereby avoiding the self-locking condition that may occur during the movement, causing the movement mechanism to fail to meet the requirements.

[0082] To sum up, with the help of the above-mentioned technical solution of the present invention, by setting a structure combining a fixed fan-shaped plate and an expanding and contracting fan-shaped plate and introducing a closed wedge assembly, the reel can form a completely closed cylindrical surface when it expands, eliminating the gap between adjacent fan-shaped plates, avoiding indentations on the strip and preventing foreign matter from invading the interior; at the same time, a double jaw design is adopted, in which the fixed jaw fan-shaped plate cooperates with a spring-driven wedge mechanism to achieve primary clamping, and combines with a rotatable secondary clamp to form a secondary clamp, which significantly improves the clamping reliability and prevents the belt pulling phenomenon under the condition of no hydraulic system, thereby achieving the comprehensive effect of improving the surface quality of the strip roll, extending the life of the equipment, and reducing maintenance costs and failure rates.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A closed pyramid sleeve jaw reel, characterized in that: It comprises a main shaft (4), a pyramid sleeve (6) coaxially sleeved on the outside of the main shaft (4), a pull rod (5) for driving the pyramid sleeve (6) to move axially, a side disc (1) fixed at the axial diameter of the main shaft (4), and a fixed sector plate group and an expansion and contraction sector plate group arranged alternately along the circumferential direction; the fixed sector plate group comprises a fixed sector plate 1 (12) and a fixed sector plate 2 (14) rigidly connected to the side disc (1); the expansion and contraction sector plate group comprises two mirror-image expansion and contraction sector plates 1 (11) and one expansion and contraction sector plate 2 (17), the three of which are radially slidably connected to the sliding grooves of the side disc (1) through T-blocks (26); the outer surface of the pyramid sleeve (6) is provided with an expansion and contraction inclined surface (6a) that matches the inner inclined surfaces of the expansion and contraction sector plates 1 (11) and the expansion and contraction sector plates 2 (17), and drives the expansion and contraction sector plate group to expand and contract radially when moving axially; The invention also includes a closed structure component and a double jaw component. The closed structure component is arranged between adjacent expansion and contraction sector plates, and includes a closed axial wedge (15) fixed to the pyramid sleeve (6) and a closed radial wedge (16) matched with its dovetail bevel. Both sides of the closed radial wedge (16) are restricted by the side plate (1) and the protective plate. The double jaw component is arranged between the fixed sector plate 1 (12) and the fixed sector plate 2 (14), and includes a radially movable jaw radial wedge (2), a jaw axial wedge (3) matched with its dovetail bevel, a spring (8) and a traction plate (10) for driving the jaw axial wedge (3), and a secondary clamp (19) hinged to the fixed sector plate 2 (14).

2. A closed pyramid sleeve jaw reel according to claim 1, characterized in that: The traction plate (10) is fixedly connected to the pyramid sleeve (6), and is linked to the jaw axial wedge (3) through the spring guide rod (9), and the secondary clamp (19) is connected to the spring reset device (22) through the spherical concave block (20) and the spherical convex block (21).

3. A closed pyramid sleeve jaw reel according to claim 1, characterized in that: In the closed structural component, both sides of the closed radial wedge (16) are respectively restricted by the side disc (1) and the ordinary protective plate 1 (24) and the ordinary protective plate 2 (25), and the axial displacement is converted into radial displacement through the inclined surface.

4. A closed pyramid sleeve jaw reel according to claim 1, characterized in that: The jaw radial wedge (2) of the double jaw assembly is limited on both sides by the side disc (1) and the jaw protection plate (23), and its radial displacement is achieved by the axial displacement of the jaw axial wedge (3) through the inclined surface conversion.

5. The closed pyramid jaw reel according to claim 1, characterized in that: The secondary clamp (19) is hinged in the semicircular hole of the second fixed sector plate (14), and its bottom is connected to the spring return device (22) through multiple groups of spherical concave blocks (20) and spherical convex blocks (21), so that the spring return device (22) always provides a vertical return force.

6. A closed pyramid sleeve jaw reel according to claim 1, characterized in that: The spring guide rod (9) passes through the traction plate (10) and is fixed to the jaw axial wedge (3). The spring (8) is sleeved on the spring guide rod (9) and its two ends respectively press against the jaw axial wedge (3) and the traction plate (10). A limit nut (27) is provided at the end of the spring guide rod (9).

7. A closed pyramid sleeve jaw reel according to claim 1, characterized in that: The fixed sector plate 1 (12) and the fixed sector plate 2 (14) are slidably connected to the pyramid sleeve (6) via a dovetail key (13), and the ends are rigidly fixed to the plane of the side plate (1) via screws.

8. The closed pyramid jaw reel according to claim 1, characterized in that: The T-shaped blocks (26) of the expansion and contraction sector plate 1 (11) and the expansion and contraction sector plate 2 (17) are clearance-matched with the sliding grooves of the side plate (1), limiting their radial movement only.

9. A method for operating a closed pyramid jaw reel according to any one of claims 1 to 8, characterized in that include: Steps for expanding the roll and clamping the jaws: The pull rod (5) moves leftward to drive the pyramid sleeve (6) to move leftward, and the expansion and contraction sector plate group is lifted up by the expansion and contraction inclined surface (6a) to expand radially; The pyramid sleeve (6) drives the closed axial inclined wedge (15) to move leftward, pushing the closed radial inclined wedge (16) to radially expand the closed gap; The pyramid sleeve (6) drives the traction plate (10) to move leftward to compress the spring (8), pushes the axial wedge (3) of the jaws to move leftward, drives the radial wedge (2) of the jaws to move upward to clamp the strip through the inclined surface, and pushes the secondary clamp (19) to rotate to complete the secondary clamping; Steps for reducing the roll and opening the jaws: The pull rod (5) moves rightward to drive the pyramid sleeve (6) to move rightward, and the expansion and contraction sector plate group is pulled back through the expansion and contraction inclined surface (6a) to reduce radially; The pyramid sleeve (6) drives the closed axial wedge (15) to move rightward, and pulls back the closed radial wedge (16) to reduce radially; The traction plate (10) moves rightward and disengages from the spring (8) to contact the limit nut (27), pulling the axial wedge (3) of the jaws to move rightward, and pulling back the radial wedge (2) of the jaws through the inclined surface to move downward to open the jaws. At the same time, the spring return device (22) pulls back the secondary clamp (19).

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