A pay-off reel expansion and contraction device

Abstract

The present invention provides a decompressor for an unwinder, which solves problems such as axial decompressor offset. The decompressor comprises a central rotating shaft, with a decompressor base mounted on the outer side of the central rotating shaft. The decompressor base is slidably mounted with a plurality of decompressor blocks symmetrically arranged relative to its center via an inclined guide mechanism. Each decompressor block is mounted with an arc-shaped decompressor plate on its outwardly facing side. A synchronous drive mechanism is provided between the decompressor blocks, and an axial positioning mechanism is provided between the decompressor plates and the decompressor base. This invention offers advantages such as good positioning and easy adjustment.

Description

Technical Field

[0001] The invention belongs to the technical field of unwinders, and in particular relates to an unwinder expander. Background Art

[0002] The unwinding mechanism is one of the main mechanisms of the strip winding machine, and its main function is to pull the strip evenly out of the material tray with a certain tension. To realize the unwinding action of the strip, the unwinding mechanism needs to have an outward-extending rotating main shaft, and the rotation of the shaft is generally controlled by a motor. However, in actual use, existing unwinders usually use air pressure or hydraulic pressure to control the expansion and locking of the tile structure, and once the pressure supply stops, self-locking cannot be achieved. In addition, when the conventional unwinder is tightening, the internal oblique guide structure drives the tightening tile to move radially, and it also causes the expander as a whole to translate axially along the rotating main shaft, causing the unwinding direction to shift, affecting the strip supply.

[0003] To address the shortcomings of the existing technology, researchers have conducted extensive research and proposed various solutions. For example, Chinese patent document [201210133631.1] discloses a rewinder [201210133631.1], which includes a sleeve bearing chamber. The sleeve bearing chamber is provided with, from the outer end to the inner end, a bidirectional thrust bearing mounted on a pull rod, a first compression spring, and a limit member. The pull rod is provided with a first shoulder. The first compression spring is clamped between the limit member and the first shoulder of the pull rod. The pull rod is provided with a force-applying structure for pushing the bidirectional thrust bearing inward. The inner ring of the bidirectional thrust bearing is mounted on a first inner ring sleeve. The first inner ring sleeve is slidably mounted on the pull rod relative to the pull rod. The first inner ring sleeve is located within the outer ring of the bidirectional thrust bearing and is provided with a second shoulder for tightening the inner ring of the bidirectional thrust bearing inward. The first compression spring applies a spring force directly or indirectly to the inner end surface of the first inner ring sleeve.

[0004] The above solution solves the problem of internal self-locking of the shrinking and expanding mechanism to a certain extent, but the solution still has many shortcomings, such as axial deviation of the shrinking and expanding mechanism during unwinding. Summary of the Invention

[0005] The object of the present invention is to provide a retractor for an unwinder with a reasonable design and effective avoidance of axial deviation in order to solve the above problems.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a retractor for an unwinder, comprising a central rotating shaft, a retractor base mounted on the outer side of the central rotating shaft, a plurality of retractor blocks symmetrically arranged relative to its center being slidably mounted on the retractor base via an inclined guide mechanism, arc-shaped retractor plates being mounted on the outwardly facing sides of the retractor blocks, a synchronous drive mechanism being provided between the retractor blocks, and an axial positioning mechanism being provided between the retractor plates and the retractor base. The retractor plates and retractor blocks are symmetrically arranged, radially retracting and expanding under the guidance of the inclined guide mechanism, and the synchronous drive mechanism maintaining the synchronous movement of the retractor blocks. Due to the overall symmetrical structure, the retractor plates maintain a relatively fixed axial position during the synchronous sliding of the front-to-back symmetrical retractor blocks, and the axial positioning mechanism limits the range of motion of the retractor plates and the retractor base.

[0007] In the aforementioned unwinder expander, the inclined guide mechanism includes a guide block positioned outside the expansion and contraction base, a circumferential limit assembly positioned between the guide block and the expansion and contraction base, an axial adjustment mechanism positioned between the guide block and the expansion and contraction base, and an inclined guide assembly positioned between the guide block and the expansion and contraction block. The guide block in the inclined guide mechanism moves synchronously with the expansion and contraction block, enabling bidirectional adjustment and ensuring a wide radial adjustment range for the expansion and contraction plate.

[0008] In the aforementioned unwinder expander, the inclined guide assembly includes inclined guide surfaces disposed on the exterior of a guide block and the interior of the expansion and contraction block. The guide block is symmetrically arranged relative to the center of the expansion and contraction base, and the expansion and contraction block is symmetrically arranged relative to the center of the expansion and contraction base. The inclined guide surfaces of the expansion and contraction block and the guide block mate with each other and are slidably connected by guide grooves and guide strips, each having a T-shaped or dovetail-shaped cross-section. The guide grooves and guide strips in the inclined guide assembly connect the expansion and contraction block to the guide block without affecting their normal sliding.

[0009] In the aforementioned unwinder expander, the circumferential limit assembly includes a circumferential limit groove disposed outside the expander base and extending axially, and the guide block includes a circumferential limit strip slidably connected to the circumferential limit groove. The circumferential limit assembly ensures that the guide block can only slide axially along the expander base.

[0010] In the aforementioned unwinder expander, the axial adjustment mechanism includes an adjustment support ring disposed in the middle of the expander base and positioned between the guide blocks. An adjustment screw corresponding to each guide block is rotatably mounted on the adjustment support ring. The threads on the adjustment screw are symmetrically arranged relative to the adjustment support ring. The guide blocks have adjustment holes that are threaded with the adjustment screws. An adjustment gear is fixed in the middle of the adjustment screw. An adjustment ring is rotatably mounted on the adjustment support ring and meshes with the adjustment gear. The adjustment ring meshes with the adjustment motor via a planetary gear set. The axial adjustment mechanism drives the guide blocks toward or away from each other, and the slidably connected expander blocks also move toward or away from each other, thereby driving the expander plate to move radially.

[0011] In the aforementioned unwinder shrinker, the synchronous drive mechanism includes a drive plate disposed on one side of an adjustable support ring, fixedly mounted between circumferentially adjacent guide blocks. The drive plate has a synchronization bar extending radially outward. A shrinking block on the other side of the adjustable support ring has a synchronization groove opposite the drive plate. The synchronization groove extends radially and is slidably connected to the synchronization bar. The drive plates on either side of the adjustable support ring are circumferentially spaced apart, and the adjustable support ring has a drive slot for the drive plates to pass through. The synchronous drive mechanism ensures synchronization between the symmetrically arranged shrinking blocks and guide blocks, preventing them from getting stuck during sliding.

[0012] In the aforementioned unwinder expander, the axial positioning mechanism includes positioning plates fixed to both ends of the expander base. The plates are provided with radially extending positioning slots. Positioning slides are provided at the ends of the expander plates, engaging with the positioning plates. The slides have positioning blocks that are slidably connected to the positioning slots. The axial positioning mechanism limits the sliding range of the guide blocks.

[0013] In the aforementioned unwinder expander, the expansion and contraction plates comprise paired sub-plates, with locking assemblies located at the junction of the sub-plate ends. A translation assembly is provided between the sub-plates and the expansion and contraction block. The translation assembly includes a translation slot located within the sub-plates, and the expansion and contraction block includes a translation bar slidably connected to the translation slot. The translation slot and the translation bar each extend axially. The expansion and contraction plates can be separated or combined using the locking and translation assemblies to accommodate the unwinding needs of strips of varying widths.

[0014] In the aforementioned unwinder expander, the locking assembly includes an electric push rod disposed between the inner and outer sides of the sub-plate bodies, with a locking block fixed at the end of the electric push rod; a locking cavity is defined within the opposing ends of the paired sub-plate bodies, a locking plate is rotatably mounted within the locking cavity, and an elastic reset member is provided between the locking plate and the locking cavity; a locking opening communicating with the locking cavity is defined on the side of the sub-plate body opposite the electric push rod and its locking block; a locking slot is defined on the locking plate opposite the locking opening; a locking clip at the end of the locking block passes through the locking opening and engages with the locking slot; a separation opening communicating with the locking cavity is defined on the side of the sub-plate body opposite the expansion and contraction block; a separation clip is provided on the locking plate; and a separation slot is defined on the expansion and contraction block for the separation clip to pass through the separation opening and engage with the separation clip. The locking assembly is independently separated by the electric push rod to adjust the length of each expansion and contraction plate.

[0015] In the above-mentioned unwinder shrinker, a linkage assembly is provided between the shrinking and expanding base and the central rotating shaft, and the linkage assembly is equipped with a loosening assembly; the linkage assembly includes a linkage groove provided on the inner side of the shrinking and expanding base and the linkage grooves are arranged symmetrically with respect to the center, and the central rotating shaft is slidably mounted with a linkage block plugged into the linkage groove; the loosening assembly includes a loosening shaft telescopically mounted in the central rotating shaft and extending axially, the loosening shaft and the central rotating shaft are connected by a pneumatic push rod, a linkage cavity is provided between the linkage block and the central rotating shaft, the linkage cavity is connected to a hydraulic cavity extending circumferentially along the central rotating shaft through a hydraulic circuit, a hydraulic valve plate is slidably mounted in the hydraulic cavity, and the hydraulic valve plate is connected to a loosening plate provided on the loosening shaft through a hydraulic push rod. The linkage assembly and the loosening assembly facilitate the rapid disassembly and assembly of the shrinking and expanding base and the central rotating shaft, and can be loosened in time when necessary to avoid torque overload on the shrinker.

[0016] Compared with the existing technology, the advantages of the present invention are: each expansion and contraction plate moves in the radial direction, and its axial position relative to the expansion and contraction base remains unchanged, preventing the strip from shifting and dislocating during the unwinding process; the expansion and contraction block and the guide block are synchronously offset in the opposite direction, ensuring that the expansion and contraction plate has a larger adjustment range and can adapt to the winding requirements of strips with different curling radians; the expansion and contraction base and the center shaft can be quickly disassembled and assembled, and can be loosened in time to serve as a safety measure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural cross-sectional view of the present invention;

[0018] Figure 2 yes Figure 1 Structural cross-sectional view in the AA direction;

[0019] Figure 3 It is a partial enlarged view of the present invention;

[0020] Figure 4 It is a partial enlarged view of the present invention;

[0021] Figure 5 It is a partial enlarged view of the present invention;

[0022] In the figure, the central shaft 1, the loosening shaft 11, the pneumatic push rod 12, the linkage chamber 13, the hydraulic circuit 14, the hydraulic chamber 15, the hydraulic valve plate 16, the hydraulic push rod 17, the loosening plate 18, the shrinkage base 2, the linkage groove 21, the linkage block 22, the inclined plane guide mechanism 3, the guide block 31, the circumferential limit assembly 32, the circumferential limit groove 321, the circumferential limit strip 322, the axial adjustment mechanism 33, the adjustment support ring 331, the adjustment screw 332, the adjustment hole 333, the adjustment gear 334, the adjustment gear ring 335, the planetary gear set 336, the adjustment motor 337, the inclined plane guide assembly 34, the guide inclined plane 341, the guide Slot 342, guide bar 343, expansion and contraction block 4, expansion and contraction plate 5, sub-plate body 51, locking assembly 52, electric push rod 521, locking block 522, locking cavity 523, locking plate 524, elastic reset member 525, locking mouth 526, locking slot 527, locking buckle 528, translation assembly 53, separation mouth 531, separation buckle 532, separation slot 533, translation slot 54, translation bar 55, synchronous drive mechanism 6, drive pull plate 61, synchronization bar 62, synchronization groove 63, drive slide 64, axial positioning mechanism 7, positioning sealing plate 71, positioning slot 72, positioning slide 73, positioning block 74. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-5 As shown, a retractor for an unwinder includes a central rotating shaft 1 connected to a rewinding drive motor, a retracting base 2 mounted on the outside of the central rotating shaft 1, and a mounting hole for inserting the central rotating shaft 1 is provided on the retracting base 2. The retracting base 2 is slidably mounted with a number of retracting blocks 4 arranged symmetrically relative to its center through an inclined guide mechanism 3, and two groups of retracting blocks 4 are arranged symmetrically front to back relative to the retracting base 2. An arc-shaped retracting plate 5 is mounted on the outward side of the retracting block 4 for direct contact with the strip, a synchronous driving mechanism 6 is provided between the retracting blocks 4 to maintain synchronous sliding of the retracting blocks 4 and ensure that the radial movement distance of the retracting plate 5 is the same, and an axial positioning mechanism 7 is provided between the retracting plate 5 and the retracting base 2 to limit the relative position of the retracting plate 5 and the retracting base 2, so as to avoid axial displacement of the retracting plate 5 relative to the retracting base 2 during the adjustment process.

[0025] Specifically, similar to existing inclined guide structures, the inclined guide mechanism 3 in this application includes a guide block 31 disposed outside the expansion base 2. The guide block 31 corresponds one-to-one with the expansion block 4 and, like the expansion block 4, is symmetrical with respect to the expansion base 2. A circumferential limit assembly 32 is provided between the guide block 31 and the expansion base 2 to ensure that the guide block 31 slides circumferentially along the expansion base 2. An axial adjustment mechanism 33 is provided between the guide block 31 and the expansion base 2 to provide driving torque for the guide block 31 and the expansion block 4. A inclined guide assembly 34 is provided between the guide block 31 and the expansion block 4 to convert the axial driving torque provided by the axial adjustment mechanism 33 into radial expansion torque.

[0026] from Figure 1 As can be seen, the volume of the guide block 31 is generally larger than that of the expansion block 4. The inclined guide assembly 34 includes a guide bevel 341 provided on the outside of the guide block 31 and on the inside of the expansion block 4. The inclined length of the guide bevel 341 of the guide block 31 is also generally greater than the length of the expansion block 4, ensuring that the guide block 31 provides better support stability for the expansion block 4. Unlike existing guide structures, the guide block 31 in this application is symmetrically arranged relative to the middle of the expansion base 2. The guide block 31 and the expansion base 2 are respectively divided into two groups relative to the front and rear of the expansion base 2. The expansion block 4 is symmetrically arranged relative to the middle of the expansion base 2 and corresponds one-to-one with the guide block 31. The expansion block 4 and the guide bevel 341 of the guide block 31 fit together and are provided with a guide groove 342 and a guide bar 343 in sliding connection therebetween. The cross-sections of the guide groove 342 and the guide bar 343 are T-shaped or dovetail-shaped. When the expansion block 4 and the guide block 31 slide relative to each other, the guide bar 343 will not disengage from the guide groove 342.

[0027] Furthermore, since each guide block 31 is relatively independent, a circumferential limit assembly 32 is employed to ensure axial sliding freedom, enabling a sliding connection between the guide block 31 and the expanding / contracting base 2. This circumferential limit assembly 32 includes a circumferential limit groove 321 disposed outside the expanding / contracting base 2 and extending axially. The guide block 31 includes a circumferential limit strip 322 slidably connected to the circumferential limit groove 321. The cross-sections of the circumferential limit groove 321 and the circumferential limit strip 322 also exhibit a T-shaped or dovetail-shaped anti-slip structure.

[0028] from Figure 5As can be seen in the figure, when the radial relative distance of the expansion and contraction plates 5 needs to be adjusted to accommodate the requirements of strip winding with different curvatures, the axial adjustment mechanism 33 is activated under the action of the main control unit. The axial adjustment mechanism 33 includes an adjustment support ring 331 arranged in the middle of the expansion and contraction base 2 and located between the guide blocks 31 as a base point. An adjustment screw 332 corresponding to the guide blocks 31 is rotatably mounted on the adjustment support ring 331. The threads on the adjustment screw 332 are symmetrically arranged relative to the adjustment support ring 331. The guide blocks 31 are provided with adjustment holes 333 that are threaded with the adjustment screw 332. When the adjustment screw 332 rotates, the guide blocks 31 threaded at both ends thereof move synchronously in opposite directions and move the same distance. An adjustment gear 334 is fixed in the middle of the adjustment screw 332 and the adjustment gear 334 is mounted inside the adjustment support ring 331. An adjustment tooth ring 335 that meshes with the adjustment gear 334 is rotatably mounted on the adjustment support ring 331, and the adjustment tooth ring 335 drives the adjustment gears 334 to rotate synchronously. The adjusting gear ring 335 is meshed with the adjusting motor 337 through the planetary gear set 336. The adjusting motor 337 and the adjusting gear ring 335 are driven by the planetary gear set 336, and the transmission ratio is switched with the clutch structure to adjust the rotation direction of the adjusting screw 322.

[0029] In addition, since the expansion block 4 and the guide block 31 at different radial positions in front and behind the expansion base 2 need to move synchronously, a synchronous drive mechanism 6 is used to transmit part of the axial drive torque of the expansion block 4 to the other guide block 31. The synchronous drive mechanism 6 includes a drive pull plate 61 arranged on one side of the adjustment support ring 331 and the drive pull plate 61 is arranged on the outside of the expansion base 2. Figure 2 As shown, the drive plate 61 is fixedly mounted between circumferentially adjacent guide blocks 31. The drive plate 61 has a synchronization bar 62 extending radially outward. A synchronization groove 63 is defined on the side of the expansion / contraction block 4 on the other side of the adjustment support ring 331, facing the drive plate 61. The synchronization groove 63 extends radially and is slidably connected to the synchronization bar 62. The drive plates 61 on either side of the adjustment support ring 331 are circumferentially spaced apart. The adjustment support ring 331 has a drive slot 64 through which the drive plate 61 passes. The drive plate 61 slides within the drive slot 64, and under the action of the inclined guide assembly 34, its synchronization bar 62 slides within the synchronization slot 63 accordingly.

[0030] At the same time, the axial positioning mechanism 7 includes a positioning sealing plate 71 fixed to both ends of the expansion base 2. The positioning sealing plate 71 has a radially extending positioning groove 72. The expansion plate 5 is provided with a positioning slide 73 at the end thereof, which is in contact with the positioning sealing plate 71. Under normal conditions, the positioning slide 73 is in contact with the outer side of the positioning sealing plate 71. The positioning slide 73 has a positioning block 74 slidably connected to the positioning groove 72 to ensure that the expansion plate 5 moves radially relative to the expansion base 2.

[0031] It can be seen that in addition to meeting the winding requirements of strips of a single width, the expander also needs to flexibly adapt to strips of different widths. The expander plate 5 includes a pair of sub-plates 51. A locking assembly 52 is provided at the intersection of the ends of the sub-plates 51. A translation assembly 53 is provided between the sub-plates 51 and the expander block 4. The locking assembly 52 and the translation assembly 53 cooperate to control the relative distance between the two ends of the expander plate 5. During the radial adjustment process, they can be separated in time to increase the pressing force on the coiled strip and improve the coiling stability of the strip. The translation assembly 53 includes a translation slot 54 provided on the inner side of the sub-plate 51. The expander block 4 has a translation bar 55 slidably connected to the translation slot 54. The translation slot 54 and the translation bar 55 extend axially. When the sub-plate 51 is in the locked state, the translation slot 54 and the translation bar 55 can slide relative to each other axially. When the sub-plate 51 is in the separated state, the translation slot 54 and the translation bar 55 are relatively fixed in the axial direction.

[0032] like Figure 3 As shown, the locking assembly 52 includes an electric push rod 521 arranged between the inner sides of the sub-plate bodies 51 to provide a locking torque. Under normal conditions, each electric push rod 521 extends and retracts synchronously to keep the radial relative distance between each expansion and contraction plate 5 and the expansion and contraction base 2 the same. The electric push rod 521 can also extend and retract independently, so that the radial relative distance between the expansion and contraction plate 5 and the expansion and contraction base 2 is inconsistent, so that the strip wound by the expansion and contraction plate 5 changes from a circular shape to an irregular shape, which meets the winding requirements of the flexible strip. A locking block 522 is fixed at the end of the electric push rod 521; a locking cavity 523 is respectively provided inside the opposite ends of the sub-plate bodies 51 arranged in pairs, and a locking plate 524 is rotatably installed in the locking cavity 523, and an elastic reset member 525 is provided between the locking plate 524 and the locking cavity 523. A locking opening 526 connected to the locking cavity 523 is provided on the side of the sub-plate body 51 opposite to the electric push rod 521 and its locking block 522. The locking plate 524 A locking slot 527 is formed opposite the locking opening 526. A locking clip 528 at the end of the locking block 522 passes through the locking opening 526 and engages with the locking slot 527. A separation opening 531 is formed on the side of the sub-plate 51 opposite the expansion block 4, communicating with the locking cavity 523. A separation clip 532 is provided on the locking piece 524. A separation slot 533 is formed on the expansion block 4 for the separation clip 532 to pass through and engage with the separation opening 531. Each extension and retraction movement of the electric push rod 521 switches between a locked and released state.

[0033] like Figure 4As shown, the conventional expansion and contraction base 2 and the central shaft 1 are connected by a pin to achieve axial and circumferential limiting fixation, which requires manual operation to accurately insert the pin. When the central shaft 1 is in motion, it cannot be separated and unlocked. A linkage assembly is provided between the expanding and contracting base 2 and the central rotating shaft 1 in the present application to realize circumferential and axial locking, and the linkage assembly is equipped with a loosening assembly to play an overload protection role; the linkage assembly includes a linkage groove 21 provided on the inner side of the expanding and contracting base 2, and the linkage groove 21 is arranged in a central symmetrical manner, and the central rotating shaft 1 is slidably installed with a linkage block 22 plugged into the linkage groove 21; the loosening assembly includes a loosening shaft 11 telescopically installed in the central rotating shaft 1 and extending axially, the loosening shaft 11 and the central rotating shaft 1 are connected to each other through a pneumatic push rod 12, a linkage chamber 13 is provided between the linkage block 22 and the central rotating shaft 1, the linkage chamber 12 is connected to the hydraulic chamber 15 extending circumferentially along the central rotating shaft 1 through a hydraulic circuit 14, a hydraulic valve plate 16 is slidably installed in the hydraulic chamber 15, and the hydraulic valve plate 16 is connected to the loosening plate 18 provided on the loosening shaft 11 through a hydraulic push rod 17. When the pneumatic push rod 12 drives the release shaft 11 to move telescopically relative to the central rotating shaft 1, the release plate 18, the hydraulic valve plate 16 and the hydraulic push rod 17 move axially synchronously, and the hydraulic oil in the hydraulic chamber 15 is pressed into the linkage chamber 12 through the hydraulic circuit 14. The linkage block 22 telescopically installed in the linkage chamber 13 is then pushed out and plugged into the linkage groove 21.

[0034] To sum up, the principle of this embodiment is that the expansion and contraction base 2 is slidably installed with expansion and contraction blocks 4 arranged in pairs and symmetrically relative to the middle part of the expansion and contraction base 2 through the inclined guide mechanism 3. The expansion and contraction bases 2 approach or move away from each other under the synchronous drive mechanism 6, and the expansion and contraction blocks 4 are guided by the inclined guide mechanism 3 to expand or contract in the radial direction relative to the expansion and contraction base 2. The expansion plate 5 installed on the expansion block 4 is kept balanced by the expansion block 4 and the axial position with the expansion and contraction base 2 is always kept fixed, and will not axially deviate due to the guidance of the inclined guide mechanism 3.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0036] Although this article uses more central shaft 1, loosening shaft 11, pneumatic push rod 12, linkage chamber 13, hydraulic circuit 14, hydraulic chamber 15, hydraulic valve plate 16, hydraulic push rod 17, loosening plate 18, expansion and contraction base 2, linkage groove 21, linkage block 22, inclined plane guide mechanism 3, guide block 31, circumferential limit assembly 32, circumferential limit groove 321, circumferential limit strip 322, axial adjustment mechanism 33, adjustment support ring 331, adjustment screw 332, adjustment hole 333, adjustment gear 334, adjustment gear ring 335, planetary gear set 336, adjustment motor 337, inclined plane guide assembly 34, guide inclined plane 341, guide groove 342, guide The terms guide bar 343, expansion block 4, expansion plate 5, auxiliary plate body 51, locking assembly 52, electric push rod 521, locking block 522, locking cavity 523, locking piece 524, elastic reset member 525, locking opening 526, locking slot 527, locking buckle 528, translation assembly 53, separation opening 531, separation buckle 532, separation slot 533, translation slot 54, translation bar 55, synchronous drive mechanism 6, drive pull plate 61, synchronization bar 62, synchronization slot 63, drive slide 64, axial positioning mechanism 7, positioning sealing plate 71, positioning slot 72, positioning slide 73, positioning block 74, etc. are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A retractor for an unwinding machine, comprising a central rotating shaft (1), a retractor base (2) being mounted on the outer side of the central rotating shaft (1), a plurality of retractor blocks (4) being slidably mounted on the retractor base (2) via an inclined guide mechanism (3) and arranged symmetrically relative to the center thereof, an arc-shaped retractor plate (5) being mounted on each outward side of the retractor blocks (4), and characterized in that: A synchronous driving mechanism (6) is provided between the shrinking and expanding blocks (4), and an axial positioning mechanism (7) is provided between the shrinking and expanding plate (5) and the shrinking and expanding base (2); the inclined guide mechanism (3) includes a guide block (31) provided on the outside of the shrinking and expanding base (2), a circumferential limiting assembly (32) is provided between the guide block (31) and the shrinking and expanding base (2), an axial adjustment mechanism (33) is provided between the guide block (31) and the shrinking and expanding base (2), and the guide block (31) is provided on the outside of the shrinking and expanding base (2). An inclined guide assembly (34) is provided between the guide block (31) and the shrinking block (4); the inclined guide assembly (34) includes a guiding inclined surface (341) provided on the outside of the guide block (31) and the inside of the shrinking block (4); the guide block (31) is symmetrically arranged relative to the middle of the shrinking base (2); the shrinking block (4) is symmetrically arranged relative to the middle of the shrinking base (2); the guiding inclined surfaces (341) of the shrinking block (4) and the guide block (31) fit together and are provided between them. A guide groove (342) and a guide bar (343) are provided for sliding connection, and the cross-sections of the guide groove (342) and the guide bar (343) are T-shaped or dovetail-shaped; the axial adjustment mechanism (33) includes an adjustment support ring (331) arranged in the middle of the expansion and contraction base (2) and located between the guide blocks (31), and an adjustment screw (332) corresponding to the guide blocks (31) is rotatably mounted on the adjustment support ring (331), and the screw on the adjustment screw (332) is The grooves are symmetrically arranged relative to the adjustment support ring (331), the guide block (31) is provided with an adjustment hole (333) threadedly driven with the adjustment screw (332), an adjustment gear (334) is fixed in the middle of the adjustment screw (332), an adjustment gear ring (335) is rotatably mounted on the adjustment support ring (331) and meshed with the adjustment gear (334), and the adjustment gear ring (335) is meshed with the adjustment motor (337) through the planetary gear set (336).

2. The unwinding machine shrinking device according to claim 1, characterized in that: The circumferential limiting assembly (32) comprises a circumferential limiting groove (321) arranged outside the shrinking and expanding base (2) and extending axially, and the guide block (31) comprises a circumferential limiting strip (322) slidably connected to the circumferential limiting groove (321).

3. The unwinding machine shrinking device according to claim 1, characterized in that: The synchronous drive mechanism (6) includes a driving pull plate (61) arranged on one side of the adjustment support ring (331), the driving pull plate (61) is fixedly installed between circumferentially adjacent guide blocks (31), the driving pull plate (61) has a synchronization bar (62) extending radially outward, the shrinkage block (4) on the other side of the adjustment support ring (331) is provided with a synchronization groove (63) opposite to the driving pull plate (61), the synchronization groove (63) extends radially and is slidably connected to the synchronization bar (62), the driving pull plates (61) on both sides of the adjustment support ring (331) are arranged at intervals along the circumferential direction, and the adjustment support ring (331) is provided with a driving slide groove (64) for the driving pull plate (61) to pass through.

4. The unwinding machine shrinking device according to claim 1, characterized in that: The axial positioning mechanism (7) includes a positioning sealing plate (71) fixed at both ends of the expansion and contraction base (2), the positioning sealing plate (71) is provided with a positioning groove (72) extending in the radial direction, and the end of the expansion and contraction plate (5) is provided with a positioning slide (73) that fits with the positioning sealing plate (71), and the positioning slide (73) has a positioning block (74) that is slidably connected to the positioning groove (72).

5. The unwinding machine shrinking device according to claim 1, characterized in that: The expansion and contraction plate (5) includes auxiliary plate bodies (51) arranged in pairs, a locking assembly (52) is provided at the junction of the ends of the auxiliary plate bodies (51), and a translation assembly (53) is provided between the auxiliary plate bodies (51) and the expansion and contraction block (4); the translation assembly (53) includes a translation groove (54) provided on the inner side of the auxiliary plate body (51), and the expansion and contraction block (4) has a translation bar (55) slidably connected to the translation groove (54), and the translation groove (54) and the translation bar (55) extend axially respectively.

6. The unwinder shrinking device according to claim 5, characterized in that: The locking assembly (52) includes an electric push rod (521) arranged between the inner sides of the auxiliary plate (51), and a locking block (522) is fixed at the end of the electric push rod (521); a locking cavity (523) is respectively opened inside the opposite ends of the auxiliary plate (51) arranged in pairs, a locking plate (524) is rotatably installed in the locking cavity (523), and an elastic reset member (525) is provided between the locking plate (524) and the locking cavity (523); a locking member (525) is opened on the side of the auxiliary plate (51) opposite to the electric push rod (521) and its locking block (522) and communicated with the locking cavity (523). The locking piece (524) is provided with a locking slot (527) opposite to the locking slot (526), and the locking buckle (528) at the end of the locking block (522) passes through the locking slot (526) and is plugged into the locking slot (527); the auxiliary plate (51) is provided with a separation opening (531) connected to the locking cavity (523) on the side opposite to the shrinking and expanding block (4), and the locking piece (524) is provided with a separation buckle (532), and the shrinking and expanding block (4) is provided with a separation slot (533) for the separation buckle (532) to pass through the separation opening (531) and be plugged into it.

7. The unwinder shrinking device according to claim 1, characterized in that: A linkage assembly is provided between the shrinking and expanding base (2) and the central rotating shaft (1), and the linkage assembly is equipped with a loosening assembly; the linkage assembly includes a linkage groove (21) provided on the inner side of the shrinking and expanding base (2), and the linkage groove (21) is arranged in a central symmetrical manner, and the central rotating shaft (1) is slidably mounted with a linkage block (22) plugged into the linkage groove (21); the loosening assembly includes a loosening shaft (11) telescopically mounted in the central rotating shaft (1) and extending in the axial direction, and the loosening shaft ( 11) is connected to the central rotating shaft (1) through a pneumatic push rod (12), a linkage chamber (13) is provided between the linkage block (22) and the central rotating shaft (1), the linkage chamber (13) is communicated with a hydraulic chamber (15) extending circumferentially along the central rotating shaft (1) through a hydraulic circuit (14), a hydraulic valve plate (16) is slidably installed in the hydraulic chamber (15), and the hydraulic valve plate (16) is connected to a release plate (18) provided on the release shaft (11) through a hydraulic push rod (17).

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