Center-shaft-less driving mechanism of double-sided circular knitting machine and double-sided circular knitting machine

Abstract

The present invention relates to a center-shaft-free driving mechanism of a double-sided circular knitting machine and a double-sided circular knitting machine. The machine frame, a large plate, a large plate gear, a large tripod outer ring, a large tripod gear, a bead plate, a driving assembly and a large tripod inner ring; the large tripod outer ring is provided with an annular large tripod mounting groove; the large tripod outer ring is provided with a first through hole; the large tripod inner ring is provided with an inner ring kit; the bottom outer periphery of the large tripod gear is provided with an annular positioning flange; the outer peripheral wall of the large tripod inner ring includes a cylindrical matching positioning surface and a step support surface, the large tripod inner ring is coaxially rotated with the inner peripheral wall of the annular positioning flange of the large tripod gear through the cylindrical matching positioning surface, the large tripod gear is installed in the large tripod mounting groove and the bottom is movably supported on the step support surface of the large tripod inner ring. The present invention adopts a center-shaft-free design, the large tripod gear is rotated and positioned through the large tripod inner ring, and the bead plate is directly locked and fixed to the lower end of the large tripod gear, which can effectively solve the problem of asynchronism of the upper and lower disc knitting needles, thereby improving the quality of the knitted finished product.

Description

Technical Field

[0001] The invention relates to the field of knitting machines, in particular to a center-shaft-free driving mechanism of a double-sided circular knitting machine and a double-sided circular knitting machine. Background Art

[0002] like Figure 1-4 As shown, a large plate 2 is placed horizontally on the frame 1 of the existing knitting machine, a large plate gear 3 is installed in the large plate 2, and the large plate gear 3 is provided with lower plate knitting needles c distributed in a circumferential direction around the vertical central axis. The lower plate knitting needles c are placed vertically and can perform up and down knitting movements. A large tripod outer ring 4 is provided above the large plate 2, and a large tripod gear 6 is installed in the large tripod outer ring 4. The large tripod gear 6 is synchronously and fixedly connected with a bead plate 7 located between the large plate 2 and the large tripod outer ring 4 through a central axis d. The bead plate 7 is provided with upper plate knitting needles e distributed in a circumferential direction around the vertical central axis, the upper plate knitting needles e extend in a radial direction, and the upper plate knitting needles e can move and weave in the radial direction. At the same time, the large tripod gear 6 and the large plate gear 3 are driven synchronously through the driving assembly 8, wherein the rotation of the large tripod gear 6 can drive the bead plate 7 thereon to rotate synchronously with the large plate gear 3 through the central axis d. Since the large tripod gear 6 will be deformed during the transmission process from the central axis d to the bead plate 7, the upper plate knitting needles e on the bead plate 7 and the corresponding lower plate knitting needles c on the large plate gear 3 cannot be knitted synchronously, and a lag will occur, which reduces the quality of the knitted product. Summary of the invention

[0003] The purpose of the present invention is to overcome the above shortcomings and provide a center-shaft-free driving mechanism for a double-sided knitting circular knitting machine and a double-sided knitting circular knitting machine. The mechanism and the double-sided knitting circular knitting machine adopt a center-shaft-free design. The large tripod gear is rotated and positioned by the inner ring of the large tripod, and the bead disk is directly locked and fixed at the lower end of the large tripod gear, which can effectively solve the problem of the upper and lower disk knitting needles being out of sync, thereby improving the quality of the woven product.

[0004] The present invention is achieved through the following technical solutions:

[0005] Solution 1:

[0006] A center-axis-free driving mechanism for a double-sided circular knitting machine comprises a frame, a large plate fixedly mounted on the lower part of the frame, a large plate gear rotatably connected with the large plate and having a vertical rotation center axis for mounting and driving the lower plate knitting needles to rotate, a large tripod outer ring fixedly mounted on the upper part of the frame, a large tripod gear rotatably connected with the large tripod outer ring and having a rotation center axis coincident with the rotation center axis of the large plate gear, a bead plate coaxially fixedly mounted on the bottom of the large tripod gear for mounting and driving the upper plate knitting needles to rotate, and a driving assembly for driving the large tripod gear and the large plate gear to rotate; the characteristic is that the center-axis-free driving mechanism further comprises a large tripod inner ring;

[0007] The upper end of the outer ring of the large tripod is provided with an annular large tripod mounting groove which is concave downwards and arranged around the central axis of the large disc gear and is open at the top for mounting the large tripod inner ring and the large tripod gear; the middle part of the outer ring of the large tripod is provided with a first through hole which is located in the middle part of the large tripod mounting groove and passes through the upper and lower end surfaces of the outer ring of the large tripod upward and downward; the inner ring of the large tripod is coaxially mounted in the large tripod mounting groove, and the middle part of the inner ring of the large tripod is provided with an inner ring kit which extends upward and inwards over the inner groove wall of the large tripod mounting groove and then extends downward and is hollow, and the inner ring kit moves through the first through hole of the outer ring of the large tripod and continues to extend downward, and the extended bottom is used to mount the upper disc knitting needle guide device;

[0008] The bottom periphery of the large tripod gear is provided with an annular positioning flange protruding downward and arranged around the rotation center axis of the large tripod gear; the outer peripheral wall of the large tripod inner ring includes a cylindrical matching positioning surface coaxial with the large tripod inner ring, and a step support surface connected to the bottom of the cylindrical matching positioning surface and protruding outward, the large tripod inner ring is coaxially rotated with the inner peripheral wall of the annular positioning flange of the large tripod gear through the cylindrical matching positioning surface, the large tripod gear is installed in the large tripod installation groove and the bottom is movably supported on the step support surface of the large tripod inner ring;

[0009] The middle part of the gear of the big tripod also extends inward and downward to form a gear set, which moves through the hollow hole of the inner ring set of the inner ring of the big tripod and extends downward out of the hollow hole of the inner ring set; the bead plate is coaxially fixed and locked to the lower part of the gear set of the gear of the big tripod and is located between the big plate and the outer ring of the big tripod;

[0010] The driving assembly includes a main transmission shaft extending in the vertical direction and rotatably connected to the frame and located on the radial side of the large plate gear and the large tripod gear, a main transmission lower gear coaxially fixedly installed on the main transmission shaft and capable of cooperating with the outer gear ring of the large plate gear for transmission, a main transmission upper gear installed on the main transmission shaft and capable of cooperating with the outer gear ring of the large tripod gear for transmission, and a driving motor and its transmission components for driving the main transmission shaft to rotate.

[0011] Preferably, a large disc installation groove for installing the large disc gear is also provided in the middle of the large disc, which is arranged around the central axis of the large disc gear and is recessed downward and open at the top, and the large disc gear is rotatably connected in the large disc installation groove.

[0012] In order to facilitate the adjustment of the intersection position of the upper disc knitting needles and the lower disc knitting needles, the center-shaft-free driving mechanism also includes a lifting mechanism for driving the gear of the large tripod and the inner ring of the large tripod to vertically lift and lower;

[0013] The lifting mechanism comprises lifting units with two or more sets of spacer rings arranged at the bottom of the inner ring of the large tripod, each lifting unit comprises a lifting base, a lifting center screw, a lifting nut, a lifting gear, a lifting ring, a first top ring and a second top ring;

[0014] The lifting base is fixedly mounted on the large tripod mounting groove of the large tripod outer ring, the lower end of the lifting center screw is fixedly connected to the lifting base and the upper end extends upward in the vertical direction, the lifting nut is threadedly connected to the outer periphery of the lifting center screw, the lifting gear is coaxially fixedly sleeved on the outer periphery of the lifting nut, the lifting ring is movably sleeved on the upper outer periphery of the lifting nut and the lifting center screw and fixedly locked on the lifting gear, the large tripod inner ring is provided with an inner ring through hole penetrating the upper and lower planes of the large tripod inner ring at a position corresponding to each group of lifting units, the lifting rings of each group of lifting units are movably inserted into the corresponding inner ring through holes, the first top ring is fixedly sleeved on the outer periphery of the lifting ring and is located below the corresponding inner ring through hole, the second top ring is fixedly locked to the upper end of the lifting ring and is placed above the inner ring through hole, and the outer diameters of the first top ring and the second top ring are both larger than the outer diameter of the inner ring through hole, so that the lifting unit cannot move axially relative to the inner ring through hole of the large tripod inner ring;

[0015] The lifting mechanism also includes a lifting drive assembly which is uniformly transmission-connected with the lifting gears of each group of lifting units and is used to drive the lifting gears of each lifting unit to spirally rotate relative to the lifting center screw.

[0016] Preferably, the inner groove wall of the large tripod mounting groove is an annular protrusion coaxially arranged around the first through hole and extending upward in the vertical direction, and the lifting drive assembly includes a lifting gear ring installed in the large tripod mounting groove and rotatably sleeved on the outer periphery of the annular protrusion, and a driving gear arranged on the radial outer side of the lifting gear ring for driving the lifting gear ring to rotate;

[0017] Each lifting unit is located on the radial outer side of the lifting gear ring, and the outer teeth of the lifting gear ring cooperate with the lifting gears of each lifting unit for transmission. The driving gear is rotatably connected to the large tripod mounting groove through a driving shaft coaxially fixed at its center and vertically arranged, and the driving gear cooperates with the lifting gear ring for transmission. The lower end of the driving shaft extends downward and is exposed below the bottom of the outer ring of the large tripod.

[0018] In order to facilitate manual adjustment, a polygonal joint is provided on the outer periphery of the lower end of the driving shaft, and a handle for driving the driving shaft to rotate is cooperatively connected to the outer periphery of the polygonal joint.

[0019] Preferably, the center-shaft-less driving mechanism further comprises a cauldron cover arranged above the outer ring of the cauldron.

[0020] In order to assist the rotation of the large tripod gear, the center-shaft-less driving mechanism further includes an auxiliary gear set with more than one spacer ring arranged on the periphery of the large tripod gear to assist the rotation of the large tripod gear;

[0021] Each auxiliary gear set includes an auxiliary shaft which is rotatably connected to the outer ring of the large tripod in the vertical direction and whose axial end extends into the mounting groove of the large tripod, and an auxiliary gear which is coaxially fixedly installed on the outer periphery of the auxiliary shaft and cooperates with the large tripod gear for transmission.

[0022] Option 2:

[0023] A double-sided circular knitting machine, characterized in that: the double-sided circular knitting machine is provided with a center-shaft-less driving mechanism as described in Scheme 1, and the double-sided circular knitting machine is also provided with lower disk needles installed and connected to a large disk gear, upper disk needles installed on a bead disk for cooperating with the lower disk needles for knitting, and an upper disk needle guide device installed at the bottom of an inner ring kit for guiding the movement of the upper disk needles.

[0024] Compared with the previous technology, the beneficial effects of the present invention are:

[0025] 1. The present invention discloses a center-shaft-free driving mechanism for a double-sided circular knitting machine and a double-sided circular knitting machine. The mechanism and the double-sided circular knitting machine adopt a center-shaft-free design. The large gear is rotated and positioned by the inner ring of the large gear, and the bead plate is directly locked and fixed at the lower end of the large gear, which can effectively solve the problem of the asynchronism of the knitting needles of the upper and lower plates, thereby improving the quality of the knitted product.

[0026] 2. The present invention provides a center-axis-free driving mechanism of a double-sided circular knitting machine and a double-sided circular knitting machine. The mechanism and the double-sided circular knitting machine are also provided with a lifting mechanism for adjusting the intersection position of the upper disk needles and the lower disk needles to facilitate the alignment of the upper disk needles and the lower disk needles.

[0027] 3. The center-shaft-free driving mechanism of a double-sided circular knitting machine and the double-sided circular knitting machine of the present invention also have the advantages of simplifying the mechanical structure, saving manufacturing costs, and being easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of an existing braiding machine;

[0029] Figure 2 It is a schematic diagram of the internal structure of an existing braiding machine;

[0030] Figure 3 It is a transmission schematic diagram of an existing braiding machine;

[0031] Figure 4 It is a schematic diagram of the use status of an existing knitting machine;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the first embodiment;

[0033] Figure 6 is a top view of the first embodiment;

[0034] Figure 7 for Figure 6 Sectional view of AA

[0035] Figure 8 for Figure 6 Cross-sectional view of the middle BB;

[0036] Fig. 9 This is a schematic diagram of the use status of the first embodiment;

[0037] Fig.10 It is a transmission relationship schematic diagram of the first embodiment;

[0038] Fig.11 for Fig.10 A vertical cross-sectional view of

[0039] Fig.12 This is a schematic diagram of the structure of the inner ring of the large tripod in Example 1;

[0040] Fig.13 It is a structural schematic diagram of the large tripod gear in the first embodiment;

[0041] Fig.14 It is a vertical cross-sectional view of the large tripod gear in the first embodiment;

[0042] Fig.15 This is a schematic diagram of the structure of the outer ring of the large tripod and the lifting mechanism in Example 1;

[0043] Fig.16 It is a structural schematic diagram of the lifting mechanism in the first embodiment;

[0044] Fig.17 It is a structural schematic diagram of the lifting unit in the first embodiment.

[0045] Explanation of reference numerals: 1-frame, 2-large plate, 21-large plate mounting groove, 3-large plate gear, 4-large tripod outer ring, 41-large tripod mounting groove, 42-first through hole, 43-annular protrusion, 5-large tripod inner ring, 51-inner ring kit, 52-cylindrical matching positioning surface, 53-inner ring through hole, 54-step support surface, 6-large tripod gear, 61-second positioning flange, 62-gear kit, 7-bead plate, 8-drive assembly, 81-main rotating shaft, 82-main transmission lower gear, 83-main transmission upper gear, 84-drive motor and its transmission parts, 9-lifting mechanism, 91-lifting unit, 911-lifting base, 912-lifting center screw, 913-lifting nut, 914-lifting gear, 915-lifting ring, 916-first top ring, 917-second top ring, 92-lifting drive assembly, 921-lifting gear ring, 922-driving gear, 923-driving shaft, 924-polygonal joint, a-auxiliary gear set, a1-auxiliary shaft, a2-auxiliary gear, b-large tripod cover, c-lower disc knitting needles, d-center shaft, e-upper disc knitting needles, f-upper disc knitting needle guide device. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with the accompanying drawings: Embodiment 1:

[0047] like Figure 5-17 As shown, a center-axis-free driving mechanism of a double-sided circular knitting machine comprises a frame 1, a large plate 2 fixedly mounted on the lower part of the frame 1, a large plate gear 3 which is rotatably connected with the large plate 2 and whose rotation center axis is vertically arranged and is used to install and drive the lower plate knitting needles c to rotate, a large tripod outer ring 4 fixedly mounted on the upper part of the frame 1, a large tripod gear 6 which is rotatably connected with the large tripod outer ring 4 and whose rotation center axis coincides with the rotation center axis of the large plate gear 3, a bead plate 7 which is coaxially fixedly mounted on the bottom of the large tripod gear 6 and is used to install and drive the upper plate knitting needles e to rotate, and a driving assembly 8 for driving the large tripod gear 6 and the large plate gear 3 to rotate; characterized in that: the center-axis-free driving mechanism also comprises a large tripod inner ring 5;

[0048] The upper end of the large tripod outer ring 4 is provided with an annular large tripod mounting groove 41 which is concave downward and arranged around the central axis of the large disc gear 3 and is open at the top, and is used to mount the large tripod inner ring 5 and the large tripod gear 6; the middle part of the large tripod outer ring 4 is provided with a first through hole 42 which is located in the middle part of the large tripod mounting groove 41 and passes through the upper and lower end surfaces of the large tripod outer ring 4 upward and downward; the large tripod inner ring 5 is coaxially installed in the large tripod mounting groove 41, and the middle part of the large tripod inner ring 5 is provided with an inner ring sleeve 51 which extends upward and inward over the inner groove wall of the large tripod mounting groove 41 and then extends downward and is hollow, and the inner ring sleeve 51 moves through the first through hole 42 of the large tripod outer ring 4 and then continues to extend downward, and the extended bottom is used to mount the upper disk knitting needle guide device f, and the upper disk knitting needle guide device f is used to control the telescopic movement of the upper disk knitting needle e in the radial direction;

[0049] The bottom periphery of the large tripod gear 6 is provided with an annular positioning flange 61 protruding downward and arranged around the rotation center axis of the large tripod gear 6; the outer peripheral wall of the large tripod inner ring 5 includes a cylindrical matching positioning surface 52 coaxial with the large tripod inner ring 5, and a step support surface 54 connected to the bottom of the cylindrical matching positioning surface 52 and protruding outward, and the large tripod inner ring 5 is coaxially rotated with the inner peripheral wall of the annular positioning flange 61 of the large tripod gear 6 through the cylindrical matching positioning surface 52, and the large tripod gear 6 is installed in the large tripod installation groove 41 and the bottom is movably supported on the step support surface 54 of the large tripod inner ring 5;

[0050] The middle part of the large tripod gear 6 also extends inward and downward to form a gear set 62, which moves through the hollow hole of the inner ring set 51 of the large tripod inner ring 5 and extends downward out of the hollow hole of the inner ring set 51; the bead plate 7 is coaxially fixed and locked to the lower part of the gear set 62 of the large tripod gear 6 and is located between the large plate 2 and the large tripod outer ring 4;

[0051] The driving assembly 8 includes a main transmission shaft 81 extending in the vertical direction and rotatably connected to the frame 1 and located on the radial side of the large plate gear 3 and the large tripod gear 6, a main transmission lower gear 82 coaxially fixedly mounted on the main transmission shaft 81 and capable of cooperating with the outer gear ring of the large plate gear 3 for transmission, a main transmission upper gear 83 mounted on the main transmission shaft 81 and capable of cooperating with the outer gear ring of the large tripod gear 6 for transmission, and a driving motor and its transmission components 84 for driving the main transmission shaft 81 to rotate.

[0052] Preferably, a large disc installation groove 21 for installing the large disc gear 3 is also provided in the middle of the large disc 2, which is arranged around the central axis of the large disc gear 3, recessed downward and open at the top, and the large disc gear 3 is rotatably connected in the large disc installation groove 21.

[0053] In order to facilitate the adjustment of the intersection position of the upper knitting needles and the lower knitting needles, the center-shaft-free driving mechanism further includes a lifting mechanism 9 for driving the large tripod gear 6 and the large tripod inner ring 5 to vertically lift and lower;

[0054] The lifting mechanism 9 includes two or more sets of lifting units 91 with spacer rings arranged at the bottom of the inner ring 5 of the cauldron, and each lifting unit 91 includes a lifting base 911, a lifting center screw 912, a lifting nut 913, a lifting gear 914, a lifting ring 915, a first top ring 916 and a second top ring 917;

[0055] The lifting base 911 is fixedly mounted on the large tripod mounting groove 41 of the large tripod outer ring 4, the lower end of the lifting center screw 912 is fixedly connected to the lifting base 911 and the upper end extends upward in the vertical direction, the lifting nut 913 is threadedly connected to the outer periphery of the lifting center screw 912, the lifting gear 914 is coaxially fixedly sleeved on the outer periphery of the lifting nut 913, the lifting ring 915 is movably sleeved on the upper outer periphery of the lifting nut 913 and the lifting center screw 912 and fixedly locked on the lifting gear 914, the large tripod inner ring 5 is in the corresponding position of each group of lifting units 91 The positions are all provided with inner ring through holes 53 penetrating the upper and lower planes of the inner ring 5 of the large tripod, and the lifting rings 915 of each group of lifting units 91 are movably inserted into the corresponding inner ring through holes 53, and the first top ring 916 is fixedly sleeved on the outer periphery of the lifting ring 915 and is located below the corresponding inner ring through hole 53, and the second top ring 917 is fixedly locked to the upper end of the lifting ring 915 and is placed above the inner ring through hole 53, and the outer diameters of the first top ring 916 and the second top ring 917 are both larger than the outer diameter of the inner ring through hole 53, so that the lifting unit 91 cannot move axially relative to the inner ring through hole 53 of the inner ring 5 of the large tripod;

[0056] The lifting mechanism 9 also includes a lifting drive assembly 92 which is transmission-connected to the lifting gears 914 of each group of lifting units 91 and is used to drive the lifting gears 914 of each lifting unit 91 to spirally rotate relative to the lifting center screw 912 .

[0057] Preferably, the inner groove wall of the large tripod mounting groove 41 is an annular protrusion 43 coaxially arranged around the first through hole 42 and extending upward in the vertical direction, and the lifting drive assembly 92 includes a lifting gear ring 921 installed in the large tripod mounting groove 41 and rotatably sleeved on the outer periphery of the annular protrusion 43, and a driving gear 922 arranged on the radial outer side of the lifting gear ring 921 for driving the lifting gear ring 921 to rotate;

[0058] Each lifting unit 91 is located on the radial outer side of the lifting gear ring 921, and the outer teeth of the lifting gear ring 921 cooperate with the lifting gear 914 of each lifting unit 91 for transmission. The driving gear 922 is rotatably connected to the large tripod mounting groove 41 through a driving shaft 923 coaxially fixed at its center and vertically arranged, and the driving gear 922 cooperates with the lifting gear ring 921 for transmission. The lower end of the driving shaft 923 extends downward and is exposed below the bottom of the large tripod outer ring 4.

[0059] In order to facilitate manual adjustment, a polygonal joint 924 is provided on the outer periphery of the lower end of the driving shaft 923 , and a handle for driving the driving shaft 923 to rotate is cooperatively connected to the outer periphery of the polygonal joint 924 .

[0060] Preferably, the center-shaft-less driving mechanism further comprises a cauldron cover b disposed above the cauldron outer ring 4 .

[0061] In order to assist the rotation of the large tripod gear, the center-shaft-free driving mechanism further includes an auxiliary gear set a having one or more spacer rings arranged around the outer periphery of the large tripod gear 6 for assisting the rotation of the large tripod gear 6;

[0062] Each auxiliary gear set a includes an auxiliary shaft a1 which is rotatably connected to the large tripod outer ring 4 in the vertical direction and has one axial end extending into the large tripod mounting groove 41, and an auxiliary gear a2 which is coaxially fixedly mounted on the outer periphery of the auxiliary shaft a1 and cooperates with the large tripod gear 6 for transmission. Embodiment 2:

[0063] A double-sided circular knitting machine, characterized in that: the double-sided circular knitting machine has the center-shaft-less driving mechanism described in Example 1, and the double-sided circular knitting machine also has a lower disk knitting needle c installed and connected to the large disk gear 3, an upper disk knitting needle e installed on the bead disk 7 for cooperating with the lower disk knitting needle c for knitting, and an upper disk knitting needle guide device f installed at the bottom of the inner circle kit 51 for guiding the movement of the upper disk knitting needle e.

[0064] Although the present invention is illustrated and described by specific embodiments and their alternatives, it should be understood that various changes and modifications within the spirit and scope of the present invention can be implemented. Therefore, it should be understood that the present invention is not limited in any sense except by the limitations of the attached claims and their equivalents.

Claims

1. A center-axis-free driving mechanism for a double-sided circular knitting machine, comprising a frame, a large plate fixedly mounted on the lower part of the frame, a large plate gear rotatably connected with the large plate and having a vertical rotation center axis for mounting and driving the lower plate knitting needles to rotate, a large tripod outer ring fixedly mounted on the upper part of the frame, a large tripod gear rotatably connected with the large tripod outer ring and having a rotation center axis coincident with the rotation center axis of the large plate gear, a bead plate coaxially fixedly mounted on the bottom of the large tripod gear for mounting and driving the upper plate knitting needles to rotate, and a driving assembly for driving the large tripod gear and the large plate gear to rotate; characterized in that: The center-shaft-less driving mechanism further includes a large tripod inner ring; The upper end of the outer ring of the large tripod is provided with a downwardly recessed annular large tripod mounting groove; the large tripod mounting groove is arranged around the central axis of the large disc gear and is open at the top, and is used to install the large tripod inner ring and the large tripod gear; the middle part of the outer ring of the large tripod is provided with a first through hole located in the middle part of the large tripod mounting groove and penetrating upward and downward through the upper and lower end surfaces of the outer ring of the large tripod; the inner ring of the large tripod is coaxially installed in the large tripod mounting groove, and the middle part of the inner ring of the large tripod is provided with an inner ring kit that extends upward and inward over the inner groove wall of the large tripod mounting groove and then extends downward and is hollow, and the inner ring kit movably passes through the first through hole of the outer ring of the large tripod and continues to extend downward, and the extended bottom is used to install the upper disc knitting needle guide device; The bottom periphery of the large tripod gear is provided with an annular positioning flange protruding downward and arranged around the rotation center axis of the large tripod gear; the outer peripheral wall of the large tripod inner ring includes a cylindrical matching positioning surface coaxial with the large tripod inner ring, and a step support surface connected to the bottom of the cylindrical matching positioning surface and protruding outward, the large tripod inner ring is coaxially rotated with the inner peripheral wall of the annular positioning flange of the large tripod gear through the cylindrical matching positioning surface, the large tripod gear is installed in the large tripod installation groove and the bottom is movably supported on the step support surface of the large tripod inner ring; The middle part of the gear of the big tripod also extends inward and downward to form a gear set, which moves through the hollow hole of the inner ring set of the inner ring of the big tripod and extends downward out of the hollow hole of the inner ring set; the bead plate is coaxially fixed and locked to the lower part of the gear set of the gear of the big tripod and is located between the big plate and the outer ring of the big tripod; The driving assembly includes a main transmission shaft extending in the vertical direction and rotatably connected to the frame and located on the radial side of the large plate gear and the large tripod gear, a main transmission lower gear coaxially fixedly installed on the main transmission shaft and capable of cooperating with the outer gear ring of the large plate gear for transmission, a main transmission upper gear installed on the main transmission shaft and capable of cooperating with the outer gear ring of the large tripod gear for transmission, and a driving motor and its transmission components for driving the main transmission shaft to rotate.

2. The center-shaft-less driving mechanism of the double-sided circular knitting machine according to claim 1, characterized in that: The middle part of the large plate is also provided with a large plate installation groove which is arranged around the central axis of the large plate gear and is recessed downward and open at the top and is used to install the large plate gear. The large plate gear is rotatably connected in the large plate installation groove.

3. The center-shaft-less driving mechanism of the double-sided circular knitting machine according to claim 2, characterized in that: The center-shaft-less driving mechanism also includes a lifting mechanism for driving the gear of the large tripod and the inner ring of the large tripod to vertically lift and lower; The lifting mechanism comprises lifting units with two or more sets of spacer rings arranged at the bottom of the inner ring of the large tripod, each lifting unit comprises a lifting base, a lifting center screw, a lifting nut, a lifting gear, a lifting ring, a first top ring and a second top ring; The lifting base is fixedly mounted on the large tripod mounting groove of the large tripod outer ring, the lower end of the lifting center screw is fixedly connected to the lifting base and the upper end extends upward in the vertical direction, the lifting nut is threadedly connected to the outer periphery of the lifting center screw, the lifting gear is coaxially fixedly sleeved on the outer periphery of the lifting nut, the lifting ring is movably sleeved on the upper outer periphery of the lifting nut and the lifting center screw and fixedly locked on the lifting gear, the large tripod inner ring is provided with an inner ring through hole that passes through the upper and lower planes of the large tripod inner ring at a position corresponding to each group of lifting units, the lifting ring of each group of lifting units is movably inserted into the corresponding inner ring through hole, the first top ring is fixedly sleeved on the outer periphery of the lifting ring and is located below the corresponding inner ring through hole, the second top ring is fixedly locked to the upper end of the lifting ring and is placed above the inner ring through hole, and the outer diameters of the first top ring and the second top ring are both larger than the outer diameter of the inner ring through hole, so that the lifting unit cannot move axially relative to the inner ring through hole of the large tripod inner ring; The lifting mechanism also includes a lifting drive assembly which is uniformly transmission-connected with the lifting gears of each group of lifting units and is used to drive the lifting gears of each lifting unit to spirally rotate relative to the lifting center screw.

4. The center-shaft-less driving mechanism of the double-sided circular knitting machine according to claim 3, characterized in that: The inner groove wall of the large tripod mounting groove is an annular protrusion coaxially arranged around the first through hole and extending upward in the vertical direction, and the lifting drive assembly includes a lifting gear ring installed in the large tripod mounting groove and rotatably sleeved on the outer periphery of the annular protrusion, and a driving gear arranged on the radial outer side of the lifting gear ring for driving the lifting gear ring to rotate; Each lifting unit is located on the radial outer side of the lifting gear ring, and the outer teeth of the lifting gear ring cooperate with the lifting gears of each lifting unit for transmission. The driving gear is rotatably connected to the large tripod mounting groove through a driving shaft coaxially fixed at its center and vertically arranged, and the driving gear cooperates with the lifting gear ring for transmission. The lower end of the driving shaft extends downward and is exposed below the bottom of the outer ring of the large tripod.

5. The center-shaft-less driving mechanism of the double-sided circular knitting machine according to claim 4, characterized in that: A polygonal joint is disposed on the outer periphery of the lower end of the driving shaft, and a handle for driving the driving shaft to rotate is cooperatively connected to the outer periphery of the polygonal joint.

6. The center-shaft-less driving mechanism of the double-sided circular knitting machine according to claim 1, characterized in that: The center-shaft-free driving mechanism further comprises a large tripod cover which is arranged above the outer ring of the large tripod.

7. The center-shaft-less driving mechanism of the double-sided circular knitting machine according to claim 1, characterized in that: The center-shaft-less driving mechanism also includes an auxiliary gear set with one or more spacer rings arranged around the outer periphery of the large tripod gear for assisting the rotation of the large tripod gear; Each auxiliary gear set includes an auxiliary shaft which is rotatably connected to the outer ring of the large tripod in the vertical direction and whose axial end extends into the mounting groove of the large tripod, and an auxiliary gear which is coaxially fixedly installed on the outer periphery of the auxiliary shaft and cooperates with the large tripod gear for transmission.

8. A double-sided circular knitting machine, characterized in that: The double-sided circular knitting machine has a center-axis-free driving mechanism as described in any one of claims 1 to 6, and also has a lower disk needle installed and connected to a large disk gear, an upper disk needle installed on a bead disk for cooperating with the lower disk needle in knitting work, and an upper disk needle guide device installed at the bottom of the inner circle kit for guiding the movement of the upper disk needle.

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