Round setting mechanism and weft knitting machine

Abstract

The circle fixing mechanism comprises a supporting arm, a positioning block and a pushing block, the upper end face of the supporting arm is an adjusting plane, the positioning block and the pushing block are both connected to the adjusting plane, the pushing block is located on the side, away from an inner ring, of the positioning block, the positioning block is provided with a sinking table used for abutting against an outer ring, and the sinking table is provided with a concave groove. The side wall, away from the pushing block, of the positioning block is used for abutting against and attaching to the peripheral wall of the outer ring, a first adjusting hole is formed in the upper end face of the positioning block in a penetrating mode, the positioning block is provided with a first bolt penetrating through the first adjusting hole and locked to the supporting arm, and a second adjusting hole is formed in the upper end face of the pushing block in a penetrating mode. The pushing block is provided with a second bolt which penetrates through the second adjusting hole and is locked to the supporting arm, a gasket is arranged between the lower end face of the positioning block and the adjusting plane, a third adjusting hole is formed in the upper plane of the sinking table in a penetrating mode and is an arc-shaped hole, and the lower end face of the sinking table is provided with a third bolt which penetrates through the third adjusting hole and is locked to the outer ring.

Description

Technical Field

[0001] The present application relates to the field of knitting technology, and in particular to a circle-fixing mechanism and a weft knitting machine. Background Art

[0002] A weft knitting machine is a knitting machine used to weave weft knitted fabrics. The characteristic of this machine is that the yarn is fed into the knitting needles along the weft direction for weaving.

[0003] In the prior art, the outer ring of a weft knitting machine is fixed relative to the frame, and the cam is mounted on the outer ring. The outer ring is stationary, while the needle cylinder is fixed to the inner ring. The inner ring and the needle cylinder rotate relative to the cam, thereby driving the knitting needles to move back and forth. In other words, the coaxiality of the outer ring relative to the inner ring is extremely critical, affecting the position of the yarn during the knitting process, thereby affecting the fabric forming effect. The coaxiality of the outer ring is mainly positioned using an external fixed positioning ring. The positioning ring fixes the outer ring, that is, the outer ring is stationary, while the inner ring rotates. The cross-section of the positioning ring is L-shaped, that is, the positioning ring has a stepped surface. The flat surface of the stepped surface is used to support the bottom surface of the outer ring to adjust the flatness of the outer ring. To ensure the flatness of the outer ring, a spacer is added on the plane of the stepped surface, or on the bottom surface of the positioning ring. The flatness of the outer ring is adjusted by adjusting the spacers of different thicknesses and then matching the flatness of the stepped surface. The inner ring surface of the step surface fits the outer circumference of the outer ring. By adjusting the horizontal position of the positioning ring, the position of the outer ring can be adjusted so that the outer ring and the inner ring are coaxial. At the same time, the positioning ring can clamp the outer ring and reduce the deformation of the outer ring, so that the roundness of the outer ring remains stable.

[0004] However, the method of using a positioning ring for circular adjustment has the following defects: First, the positioning ring itself has a large diameter, and its roundness is difficult to guarantee, and the processing is difficult. Due to the large diameter of the positioning ring and the large space occupancy rate, it is easy to deform during use, resulting in a decrease in the roundness of the positioning ring, which in turn affects the circular accuracy of the outer ring. Therefore, the cross-section of the existing positioning ring is often larger in size to enhance the structural strength of the positioning ring, thereby reducing its deformation. However, due to the large outer diameter of the positioning ring, the columns on the machine need to avoid the position of the positioning ring, so the diameter of the virtual circle formed by the columns needs to be increased, which makes the size of the entire machine increase accordingly, thereby increasing the manufacturing cost and transportation cost of the machine, and also reducing the utilization rate of the production workshop. If an avoidance hole is opened on the positioning ring, the column can pass through the avoidance hole, then the diameter of the virtual circle formed by the column is larger. Although it is not large, the size of the machine is maintained well. However, once the avoidance hole is opened on the locating ring, the stress balance of the locating ring will be destroyed, causing the locating ring to be more easily deformed and out of round. Secondly, since the locating ring is integrally formed, once the locating ring is deformed (possibly under the action of external force, such as transportation collision or natural stress deformation), the difficulty of correcting the roundness of the locating ring increases, resulting in a decrease in the accuracy of the fixed circle adjustment of the outer ring. Furthermore, in order to adjust the density or pattern of the weft-knitted fabric, the outer ring needs to be rotated slightly in the circumferential direction to change the circumferential position of the outer ring and the triangular seat relative to the inner ring. However, after the circumferential position of the outer ring is changed, the flatness and concentricity of the outer ring will change, and the flatness and concentricity of the outer ring need to be repeatedly readjusted (by adjusting the position of the locating ring and readjusting the position and number of the gaskets). The adjustment efficiency is low, so it needs further improvement. Utility Model Content

[0005] In order to improve the accuracy of circular adjustment of the outer ring, one of the purposes of this application is to provide a circular adjustment mechanism.

[0006] The present application provides a circle-fixing mechanism that adopts the following technical solution:

[0007] A circle fixing mechanism includes a support arm, a positioning block and a pushing block. The support arms are provided with an even number and are distributed around the axis of the inner ring. The two opposing support arms are symmetrically arranged along the axis of the inner ring. The upper end surface of the support arm is an adjustment plane. The positioning block and the pushing block are both connected to the adjustment plane. The pushing block is located on the side of the positioning block away from the inner ring. The positioning block has a sinking platform for the outer ring to abut. The upper plane of the sinking platform is used for the lower end surface of the outer ring to abut. The side wall of the positioning block away from the pushing block is used for the outer peripheral wall of the outer ring to abut and abut. A first adjustment hole is opened through the upper end surface of the positioning block. The positioning block is provided with a hole inserted through the first adjustment hole. The first adjusting hole is formed and locked to the first bolt of the support arm, the upper end surface of the pushing block is penetrated by a second adjusting hole, the pushing block is provided with a second bolt which is penetrated by the second adjusting hole and locked to the support arm, the first adjusting hole and the second adjusting hole are both waist-shaped holes, the length directions of the first adjusting hole and the second adjusting hole are parallel to the radial direction of the inner ring, a gasket is provided between the lower end surface of the positioning block and the adjustment plane, a third adjusting hole is penetrated by the plane on the sinking platform, the third adjusting hole is an arc hole and the axis of the arc hole coincides with the axis of the outer ring, the lower end surface of the sinking platform is provided with a third bolt which is penetrated by the third adjusting hole and locked to the outer ring.

[0008] By adopting the above technical solution, in the initial state, the push block is connected to the adjustment plane of the support arm, and the second bolt is not tightened, so that the push block can slide and adjust in the radial direction. First, the third bolt is tightened to fix the positioning block to the outer ring. At this time, the upper plane of the sinking platform and the side wall of the positioning block are respectively fitted to the bottom surface and outer peripheral surface of the outer ring, so that there is no gap between the outer ring, the sinking platform and the positioning block. Then, the positioning block is placed on the adjustment plane of the support arm, and there is an adjustment gap between the positioning block and the push block. At this time, the first bolt is not tightened, so that the positioning block can Adjust along the radial sliding, and then adjust the height of each positioning block by adding a gasket to make the flatness of the outer ring meet the requirements; then adjust the concentricity of the outer ring: use the sliding of the two opposite pushing blocks to realize the positioning block's one push and one retreat to achieve the radial displacement adjustment of the outer ring, keep the pushing block always in contact with the outer wall of the positioning block, perform the initial concentricity test on the outer ring, after the test meets the requirements, tighten the first bolt and the second bolt to fix the positioning block and the pushing block, use the pushing block to perform secondary reinforcement on the positioning block, and also prevent the positioning block from The outer ring is moved in a circular motion to improve its structural stability after adjustment, thereby improving its circularity accuracy. The concentricity of the outer ring is then tested at different positions: the third bolt is unlocked to release the outer ring from its relative fixation to the positioning block, a force is applied to the outer ring to make it rotate slightly around its own axis, and the third bolt is tightened, thereby performing a second test on the concentricity of the outer ring at this position. If the test deviation is large, the position of each positioning block needs to be adjusted again until the outer ring meets the test requirements. The third bolt is unlocked again, the outer ring is rotated again to make it rotate slightly to the next position, the third bolt is tightened, and the concentricity is tested three times until the outer ring meets the test requirements. The test and adjustment are repeated in this way. After the test meets the requirements, it can be understood that after the outer ring is adjusted and installed, each positioning block has been adjusted to a perfect circle. When the outer ring is rotated and switched in the subsequent knitting operation, there is no need to move and adjust the position of each positioning block and the push block and the number of shims. This greatly saves the circularity adjustment time spent on position switching of the outer ring during work, greatly improving knitting efficiency. There are multiple circular fixing mechanisms, which are dispersed, that is, there is enough space between the circular fixing mechanisms for the installation of columns, so there is no need to increase the size of the machine; the positioning blocks and the push blocks are small in size, and it is easy to process high-precision dimensions, such as flatness and roundness, with low processing difficulty and low cost; since the positioning blocks and the push blocks have high dimensional accuracy, the dimensional accuracy of the outer ring is high, and the dimensional accuracy of the technical solution can be controlled within 1-2 wires, and it is also not easy to have the problem of deformation and out-of-roundness that is difficult to correct in the existing integrated positioning ring.

[0009] Preferably, the pushing block is provided with a radial pushing screw for driving the positioning block to slide, the radial pushing screw thread is passed through the pushing block, the axial direction of the radial pushing screw is parallel to the radial direction of the inner ring, and one end of the radial pushing screw abuts against the outer wall of the positioning block.

[0010] By adopting the above technical solution, when the concentricity of the outer ring is adjusted, the second bolt is first locked so that the push block is fixed relative to the support arm, and then the feed amount of the radial push screw is adjusted by rotating the radial push screw, and the radial push screws on the two opposing push blocks are used to adjust the radial displacement of the positioning block and the outer ring. After the initial concentricity test of the outer ring is performed and it meets the test requirements, the first bolt is locked to fix the positioning block, and then the radial push screw is rotated so that the end face of the radial push screw close to the positioning block does not protrude from the side face of the push block close to the positioning block, the push block is moved so that the side wall of the push block abuts against the outer wall of the positioning block, and finally the second bolt is locked to fix the push block, and the radial push screw is screwed in again so that the end face of the radial push screw abuts against the outer wall of the positioning block. The two opposing push blocks cooperate to press against the positioning block to apply two opposite external forces to the outer ring, thereby correcting the deformation of the outer ring and ensuring the roundness of the outer ring.

[0011] Preferably, an anti-slip nut is provided on the threaded sleeve of one end of the radial push screw away from the positioning block.

[0012] By adopting the above technical solution, after the pushing block abuts against the positioning block and the radial pushing screw abuts against the positioning block, the anti-slip nut is screwed on so that the end face of the anti-slip nut abuts against the outer wall of the pushing block away from the positioning block. The anti-slip nut is added, and the anti-slip nut can perform secondary reinforcement on the radial pushing screw, effectively preventing the radial pushing screw from loosening after rotation, and maintaining the pushing effect of the radial pushing screw on the positioning block.

[0013] Preferably, a third threaded hole for threaded locking of a third bolt is opened on the lower end surface of the outer ring, and a plurality of third threaded holes are provided and distributed along the circumference of the outer ring.

[0014] By adopting the above technical solution, a plurality of third threaded holes are provided, and they are arranged at intervals along the circumference of the outer ring. The purpose is that due to different fabrics (such as sweatshirts or towels), the outer ring needs to make a relatively large circumferential movement adjustment, so the third threaded holes are provided in multiple locations. Even if the circumferential movement distance of the outer ring is too large, some of the third threaded holes are still located within the range of the arc hole for the third bolt to cooperate and lock.

[0015] Preferably, both sides of the sink are threadedly connected with circumferential thrust bolts, and the ends of the circumferential thrust bolts extend into the third adjustment hole and abut against the outer wall of the third bolt.

[0016] By adopting the above technical solution, when the circumferential position of the outer ring needs to be rotated and switched, the third bolt is first loosened so that the third bolt is only locked on the outer ring. After the nut end face of the third bolt is separated from the plane under the sink table, the two circumferential pushing bolts are tightened or loosened, that is, when one of the circumferential pushing bolts is screwed in, it will abut and push the third bolt. At this time, the other circumferential pushing bolt is loosened and retreated, providing rotation and sliding space for the third bolt. The screwed-in circumferential pushing bolt pushes the third bolt, thereby driving the outer ring to move circumferentially relative to the positioning block, thereby adjusting the circumferential position of the outer ring, so as to facilitate the outer ring circular adjustment or the adjustment in actual production and processing. After the outer ring completes the circumferential position adjustment, the third bolt is tightened.

[0017] Preferably, the bottom surface of the outer ring is detachably connected to a pair of protective columns located on both sides of the third bolt, the protective columns are slidably passed through the third adjustment hole, the protective columns are located between the circumferential push bolts and the third bolts, and the ends of the circumferential push bolts abut against the outer wall of the protective columns.

[0018] By adopting the above technical solution, when the circumferential position of the outer ring is switched, the fitting strength between the third bolt and the outer ring is poor after the third bolt is loosened. When adjusting the circumferential position of the outer ring, the circumferential pushing bolt directly pushes on the third bolt. The third bolt will tilt when subjected to lateral force and push the outer ring to complete the circumferential movement. At this time, the circumferential pushing bolt still maintains the pushing pressure on the third bolt. After the outer ring position adjustment is completed, in the process of tightening the third bolt, the force of the third bolt will be applied in the opposite direction to the circumferential pushing bolt, and the circumferential pushing bolt and the positioning block are fixed, that is, the force is applied to the positioning block, thereby causing the positioning block to deviate relative to the support arm, resulting in failure of the circle fixing or damage to the positioning block; therefore, protective columns are added on both sides of the third bolt, that is, the circumferential pushing bolt pushes on the protective columns to complete the circumferential movement of the outer ring, effectively avoiding direct pushing action on the third bolt, thereby avoiding the tilting of the third bolt. After the outer ring completes the circumferential position adjustment, the third bolt is tightened again.

[0019] Preferably, the protective column is interference-inserted into the outer ring or threadedly connected to the outer ring.

[0020] Preferably, the side of the positioning block away from the push block is an arc surface adapted to the outer peripheral wall of the outer ring, the arc surface and the upper plane of the sinker are both formed by grinding, and the arc surface and the upper plane of the sinker are both provided with stress reducing grooves.

[0021] By adopting the above technical solution, the arc surface of the positioning block and the upper plane of the sinker are both ground and formed, and their surface roughness and dimensional accuracy are good. The arc surface and the upper plane of the sinker are both provided with stress reducing grooves, which effectively reduce the processing difficulty and reduce the processing error, and improve the matching accuracy of the outer ring, sinker and positioning block.

[0022] In order to improve the circular adjustment accuracy of the outer ring, the second purpose of this application is to provide a weft knitting machine.

[0023] A weft knitting machine includes a circle-fixing mechanism, a base, an outer ring, an inner ring and a needle cylinder. The needle cylinder is rotatably connected to the base, and the inner ring is coaxially fixedly sleeved on the needle cylinder. The support arm is installed on the upper end surface of the base, and the outer ring is sleeved on the inner ring. Multiple triangular seats are installed on the outer ring. The bottom surface of the outer ring is in contact with the upper plane of the sinking platform, and the outer peripheral wall of the outer ring is in contact with the side wall of the positioning block away from the pushing block.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. Using the push block to reinforce the positioning block for the second time can also prevent the positioning block from moving, improve the structural stability of the outer ring after adjustment, and thus improve the circularity accuracy of the outer ring;

[0026] 2. After the outer ring is adjusted and installed, each positioning block has been debugged into a perfect circle. When the outer ring is rotated and switched in subsequent work, there is no need to move and adjust the positions of each positioning block and push block. This greatly saves the time spent on circle adjustment when the outer ring is switched during work, greatly improving work efficiency.

[0027] 3. Multiple circle-fixing mechanisms are provided and dispersedly distributed, that is, there is enough space between the circle-fixing mechanisms for the installation of columns, so there is no need to increase the size of the machine; the positioning blocks and the push blocks are small in size, and it is easy to process high-precision dimensions, such as flatness and roundness, with low processing difficulty and low cost; since the positioning blocks and the push blocks have high dimensional accuracy, the dimensional accuracy of the outer ring is high, and the dimensional accuracy of the technical solution can be controlled within 1-2 wires, and it is also not prone to the problem of deformation and out-of-roundness that is difficult to correct in the existing integrated positioning ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a weft knitting machine in Example 1.

[0029] Figure 2 Schematic diagram of the connection structure between the outer ring and the triangular seat in Example 1.

[0030] Figure 3 It is a structural diagram of the circle-fixing mechanism in Example 1.

[0031] Figure 4 Schematic diagram of the connection structure between the outer ring and the positioning block in Example 1.

[0032] Figure 5 It is a structural schematic diagram of the push block in Example 1.

[0033] Figure 6Schematic diagram of the structure of the protective column in Example 2.

[0034] Explanation of the accompanying drawings: 1. Base; 2. Syringe; 3. Inner ring; 4. Outer ring; 41. Triangular seat; 42. Step; 43. Third threaded hole; 44. Protective column; 5. Support arm; 51. Fixed block; 52. Oblique arm; 53. Support block; 54. Adjustment plane; 55. Gasket; 56. First threaded hole; 57. Second threaded hole; 6. Positioning block; 61. Sink; 62. Arc surface; 63. First adjustment hole; 64. First bolt; 65. First nut; 66. Third adjustment hole; 67. Third bolt; 68. Circumferential push bolt; 7. Push block; 71. Second adjustment hole; 72. Second bolt; 73. Radial push screw; 74. Anti-slip nut; 75. Abutment convex surface; 76. Second nut. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] Example 1:

[0037] The present application embodiment discloses a weft knitting machine, referring to Figure 1 The invention comprises a base 1, a syringe 2 coaxially connected to the upper end surface of the base 1, an inner ring 3 coaxially fixedly sleeved on the syringe 2, an outer ring 4 coaxially sleeved on the inner ring 3, and a circle setting mechanism provided on the base 1 for adjusting the circle of the outer ring 4. A plurality of triangular seats 41 are mounted on the outer ring 4. The syringe 2, inner ring 3, and triangular seats 41 are all existing technologies and are not described in detail here.

[0038] Reference Figure 1 、 Figure 2 A step 42 for mounting a triangular seat 41 is fixedly protruding from the lower portion of the inner circumferential wall of the outer ring 4. The triangular seat 41 is bolted to the top surface of the step 42 of the outer ring 4. An even number of circular positioning mechanisms are provided and distributed around the axis of the inner ring 3. The circular positioning mechanisms are arranged symmetrically along the axis of the inner ring 3 in pairs. The number of circular positioning mechanisms can be four, six, or eight. In this embodiment, six circular positioning mechanisms are preferably provided.

[0039] Reference Figure 2 、 Figure 3Each set of circular positioning mechanisms includes a support arm 5, a positioning block 6, and a push block 7. The support arm 5 comprises a fixed block 51 bolted to the upper end of the base 1, an inclined arm 52 fixedly connected to the fixed block 51, and a support block 53 fixedly connected to the upper end of the inclined arm 52. The upper end of the inclined arm 52 is tilted toward the axis of the inner ring 3. The upper end of the support block 53 is an adjustment plane 54. The positioning block 6 and the push block 7 are both connected to the adjustment plane 54. The push block 7 is located on the side of the positioning block 6 away from the inner ring 3. The positioning block 6 has a sinking platform 61 for the outer ring 4 to abut against. The side of the positioning block 6 away from the pushing block 7 is an arc surface 62 adapted to the outer peripheral wall of the outer ring 4. The arc surface 62 and the upper plane of the sinking platform 61 are both ground. Stress reducing grooves are provided in the middle of the arc surface 62 and the upper plane of the sinking platform 61. The bottom surface of the outer ring 4 fits against the upper plane of the sinking platform 61, and the outer peripheral wall of the outer ring 4 fits against the arc surface 62, so that there is no gap between the outer ring 4, the sinking platform 61 and the positioning block 6.

[0040] Reference Figure 3 、 Figure 4 A washer 55 is placed between the lower end surface of the positioning block 6 and the adjustment plane 54. A first adjustment hole 63 is defined through the upper end surface of the positioning block 6. This first adjustment hole 63 is a waist-shaped hole, with its length parallel to the radial direction of the inner ring 3. A first bolt 64 is provided on the upper end surface of the positioning block 6, passing through the first adjustment hole 63 and locked to the support block 53. In this embodiment, the first bolt 64 comprises an optical axis section that passes through the first adjustment hole 63 and a threaded section that passes through the washer 55 and the support block 53. The outer diameter of the optical axis section of the first bolt 64 is larger than that of the threaded section. A first threaded hole 56 is defined through the upper end surface of the support block 53 for threaded engagement with the first bolt 64. The threaded section of the first bolt 64 is threadedly locked with a first nut 65 that abuts the lower end surface of the support block 53. When the first bolt 64 is not fully tightened, the positioning block 6 can slide on the adjustment plane 54 along the radial direction of the inner ring 3.

[0041] Reference Figure 4 、 Figure 5The push block 7 has two abutting convex surfaces 75 protruding and fixed on the side wall near the positioning block 6. The abutting convex surfaces 75 abut the outer wall of the positioning block 6. The upper end surface of the push block 7 is penetrated by a second adjustment hole 71. The second adjustment hole 71 is a waist-shaped hole. The length direction of the second adjustment hole 71 is parallel to the radial direction of the inner ring 3. There are two second adjustment holes 71 and they are symmetrically distributed along the width centerline of the first adjustment hole 63. The upper end surface of the push block 7 is provided with a second bolt 72 that passes through the second adjustment hole 71 and is locked to the support block 53. In this embodiment, the second bolt 72 has an optical axis section that passes through the second adjustment hole 71 and a threaded section that passes through the support block 53. The outer diameter of the optical axis section of the second bolt 72 is larger than the outer diameter of the threaded section. The upper end surface of the support block 53 is penetrated by a second threaded hole 57 for the second bolt 72 to be threadedly connected. The threaded section of the second bolt 72 is threadedly locked with a second nut 76 that abuts the lower end surface of the support block 53. When the second bolt 72 is not completely tightened, the pushing block 7 can slide on the adjustment plane 54 along the radial direction of the inner ring 3 .

[0042] The push block 7 is provided with a radial push screw 73 for driving the positioning block 6 to slide. The radial push screw 73 is threaded through the push block 7. The axial direction of the radial push screw 73 is parallel to the length direction of the first adjustment hole 63. The radial push screw 73 is located between the two second adjustment holes 71 and between the two abutting convex surfaces 75. One end of the radial push screw 73 abuts the outer wall of the positioning block 6. The end surface of the radial push screw 73 away from the positioning block 6 is provided with a rotation groove along the axial direction. The radial push screw 73 can be rotated by inserting an Allen wrench into the rotation groove. The end of the radial push screw 73 away from the positioning block 6 is threadedly sleeved with an anti-slip nut 74.

[0043] A third adjustment hole 66 is defined through the bottom wall of the stress-reducing groove of the sink 61. This third adjustment hole 66 is an arc-shaped hole, whose axis coincides with the axis of the outer ring 4. A third bolt 67 is provided on the lower end surface of the sink 61, which passes through the third adjustment hole 66 and is secured to the outer ring 4. In this embodiment, the third bolt 67 comprises an optical axis section that passes through the third adjustment hole 66 and a threaded section that passes through the support block 53. The outer diameter of the optical axis section of the third bolt 67 is larger than that of the threaded section. The lower end surface of the outer ring 4 defines a plurality of third threaded holes 43 for the third bolt 67 to be threadedly secured. Multiple third threaded holes 43 are provided and distributed along the circumference of the outer ring 4. Circumferential thrust bolts 68 are threadedly connected to both sides of the sink 61. Fourth threaded holes, connected to the third adjustment hole 66 and threadedly engaged with the circumferential thrust bolts 68, are defined on both side walls of the sink 61. Circumferential thrust bolts 68 are threadedly connected to both sides of the sink 61 . Ends of the circumferential thrust bolts 68 extend into the third adjustment hole 66 and abut against the outer wall of the third bolt 67 .

[0044] The adjustment principle of the embodiment of this application:

[0045] Adjust the flatness of the outer ring 4: first tighten the third bolt 67 so that the nut end face of the third bolt 67 is pressed against the lower end face of the sinking platform 61, thereby fixing the positioning block 6 to the outer ring 4, so that the upper plane of the sinking platform 61 and the side wall of the positioning block 6 are respectively fitted to the bottom surface and outer peripheral surface of the outer ring 4, so that there is no gap between the outer ring 4 and the sinking platform 61 and the positioning block 6; then place the positioning block 6 and the pushing block 7 on the adjustment plane 54 of the support arm 5, so that the outer ring 4 is sleeved on the inner ring 3, and the outer ring 4 and the inner ring are fixed. The ring 3 has a gap and is penetrated by the first bolt 64 and the second bolt 72. There is an adjustable gap between the positioning block 6 and the push block 7. At this time, the first bolt 64 and the second bolt 72 are not tightened, so that the positioning block 6 and the outer ring 4 can slide and adjust along the radial direction of the inner ring 3. Then, the height of each positioning block 6 is adjusted by adding a gasket 55 between the lower end face of each positioning block 6 and the adjustment plane 54. The flatness of the outer ring 4 is tested by a precision tester to ensure that the flatness of the outer ring 4 meets the requirements.

[0046] Adjust the concentricity of the outer ring 4: first tighten the second bolt 72 to fix the push block 7 relative to the support arm 5, then adjust the feed amount of the radial push screw 73 by rotating the radial push screw 73. Use the advance and retreat of the radial push screws 73 on the two opposing push blocks 7 to push the positioning block 6 and the outer ring 4 to slide together in the radial direction. During the continuous radial movement of the six positioning blocks 6, the concentricity of the outer ring 4 relative to the inner ring 3 is gradually adjusted. Test the concentricity with a precision tester to ensure that the concentricity meets the requirements at a certain circumferential position of the outer ring 4.

[0047] After the first concentricity test of the outer ring 4 is performed and it meets the test requirements, the first bolt 64 is tightened to fix the positioning block 6, and then the second bolt 72 is loosened to release the fixation of the pushing block 7, and the radial pushing screw 73 is rotated back so that the end surface of the radial pushing screw 73 close to the positioning block 6 does not protrude from the side surface of the pushing block 7 close to the positioning block 6. Then, the pushing block 7 is moved so that the abutting convex surface 75 on the pushing block 7 abuts against the outer wall of the positioning block 6, and then the second bolt 72 is tightened to fix the pushing block 7, and the radial pushing screw 73 is screwed in again so that the end surface of the radial pushing screw 73 abuts against the outer wall of the positioning block 6, that is, the pushing block 7 forms a three-point abutment with the positioning block 6, and the two opposing pushing blocks 7 cooperate to press against the positioning block 6, so as to apply two opposite external forces to the outer ring 4, reduce the possibility of deformation of the outer ring 4, and ensure the roundness of the outer ring 4.

[0048] The concentricity of the outer ring 4 at different positions is tested: first, the third bolt 67 is loosened so that the third bolt 67 is only locked on the outer ring 4. After the nut end face of the third bolt 67 is separated from the lower plane of the sink 61, the fixation of the outer ring 4 relative to the positioning block 6 is released. The two circumferential pushing bolts 68 are tightened or loosened, that is, when one of the circumferential pushing bolts 68 is screwed in, it abuts and pushes the third bolt 67. At this time, the other circumferential pushing bolt 68 is loosened and retreated, providing a rotation and sliding space for the third bolt 67. The screwed-in circumferential pushing bolt 68 pushes Push the third bolt 67 to drive the outer ring 4 to move circumferentially relative to the positioning block 6, thereby adjusting the circumferential position of the outer ring 4. After the outer ring 4 completes the circumferential position change, tighten the third bolt 67 and perform a second test on the concentricity of the outer ring 4 at that position. At this time, the flatness and concentricity of the outer ring 4 may or may not change, or the changes may be within the allowable range (the allowable error range is 1-2 millimeters). If the test result exceeds the error range, it is necessary to adjust the position of each positioning block 6 again until the outer ring 4 meets the test requirements;

[0049] The outer ring 4 is subjected to multiple circumferential position switching and multiple inspection and adjustment: the third bolt 67 is unlocked again, and the circumferential position of the outer ring 4 is fine-tuned again, so that the outer ring 4 rotates slightly to the next position, and the third bolt 67 is locked, and the concentricity is inspected for the third time until the outer ring 4 meets the inspection requirements. The inspection and adjustment are repeated multiple times in this way. After the inspection meets the standards, the anti-slip nut 74 is finally screwed on the tail end of the radial pushing screw 73, so that the end face of the anti-slip nut 74 is pressed against the outer wall of the pushing block 7 away from the positioning block 6, and the pushing effect of the radial pushing screw 73 on the positioning block 6 is maintained. The first nut 65 is screwed on the lower end of the threaded section of the first bolt 64, and the second nut 76 is screwed on the lower end of the threaded section of the second bolt 72, and then normal weaving work can be started. It can be understood that after the outer ring 4 is adjusted and installed, each positioning block 6 has been debugged into a perfect circle state, so that after the outer ring 4 is rotated and switched in the subsequent weaving operation, there is no need to move and adjust the positions of each positioning block 6 and the push block 7 and the number of adjustment gaskets 55. This greatly saves the circle adjustment time spent on position switching of the outer ring 4 during work, greatly improving the weaving work efficiency.

[0050] When testing the flatness and concentricity of the outer ring 4, the precision tester is installed and fixed on the inner ring 3. The jumping needle of the precision tester points to the corresponding position of the outer ring 4. When the inner ring 3 rotates, the jumping needle of the precision tester moves on the corresponding surface of the outer ring 4 to measure the runout value. If the runout value is within the allowable deviation, it means that the adjustment is successful.

[0051] Example 2:

[0052] The difference from Example 1 is that, referring to Figure 6A pair of protective posts 44 are detachably connected to the bottom surface of the outer ring 4, located on either side of the third bolt 67. These posts 44 slide through the third adjustment hole 66. The protective posts 44 are either interference-fitted or threadedly connected to the outer ring 4. In this embodiment, a fifth threaded hole is defined between two adjacent third threaded holes 43, into which the protective posts 44 are threaded. The protective posts 44 are positioned between the circumferential thrust bolt 68 and the third bolt 67. The end of the circumferential thrust bolt 68 extends into the third adjustment hole 66 and abuts the outer wall of the protective posts 44.

[0053] When the outer ring 4 is rotated and switched in the circumferential position, the third bolt 67 and the outer ring 4 have a poor fit strength after the third bolt 67 is loosened. When the circumferential position of the outer ring 4 is adjusted, the circumferential pushing bolt 68 directly pushes on the third bolt 67. When the third bolt 67 is subjected to lateral force, it will tilt and push the outer ring 4 to complete the circumferential movement. At this time, the circumferential pushing bolt 68 still maintains the pushing pressure on the third bolt 67. After the position adjustment of the outer ring 4 is completed, in the process of tightening the third bolt 67, the force of the third bolt 67 will be applied in the opposite direction to the circumferential position. The outer ring 4 is moved in the circumferential direction by the push bolt 68, and the circumferential push bolt 68 is fixed to the positioning block 6, that is, the force is applied to the positioning block 6, thereby causing the positioning block 6 to deviate relative to the support arm 5, resulting in failure of the circle setting or damage to the positioning block 6; therefore, protective columns 44 are added on both sides of the third bolt 67, that is, the circumferential push bolt 68 pushes on the protective column 44 to complete the circumferential movement of the outer ring 4, effectively avoiding direct push action on the third bolt 67, thereby avoiding the tilt of the third bolt 67, and after the outer ring 4 completes the circumferential position adjustment, the third bolt 67 is tightened.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A circle-fixing mechanism, characterized in that: The invention comprises a support arm (5), a positioning block (6) and a push block (7), wherein the support arm (5) is provided with an even number and is distributed around the axis of the inner ring (3), and the two opposing support arms (5) are symmetrically arranged along the axis of the inner ring (3), and the upper end surface of the support arm (5) is an adjustment plane (54), the positioning block (6) and the push block (7) are both connected to the adjustment plane (54), and the push block (7) is located on the side of the positioning block (6) away from the inner ring (3), and the positioning block (6) has a sinking platform (61) for the outer ring (4) to abut, and the upper plane of the sinking platform (61) is used for the lower end surface of the outer ring (4) to abut, and the side wall of the positioning block (6) away from the push block (7) is used for the outer peripheral wall of the outer ring (4) to abut, and the upper end surface of the positioning block (6) is provided with a first adjustment hole (63) through which the positioning block (6) is provided, and a locking plate is provided through the first adjustment hole (63). A first bolt (64) is attached to the support arm (5), a second adjustment hole (71) is formed through the upper end surface of the push block (7), and the push block (7) is provided with a second bolt (72) which is passed through the second adjustment hole (71) and is locked to the support arm (5). The first adjustment hole (63) and the second adjustment hole (71) are both waist-shaped holes. The length directions of the first adjustment hole (63) and the second adjustment hole (71) are parallel to the radial direction of the inner ring (3). A gasket (55) is provided between the lower end surface of the positioning block (6) and the adjustment plane (54). A third adjustment hole (66) is formed through the upper plane of the sinking platform (61), and the third adjustment hole (66) is an arc-shaped hole and the axis of the arc-shaped hole coincides with the axis of the outer ring (4). The lower end surface of the sinking platform (61) is provided with a third bolt (67) which is passed through the third adjustment hole (66) and is locked to the outer ring (4).

2. A circle-fixing mechanism according to claim 1, characterized in that: The pushing block (7) is provided with a radial pushing screw (73) for driving the positioning block (6) to slide. The radial pushing screw (73) is threadedly arranged in the pushing block (7). The axial direction of the radial pushing screw (73) is parallel to the radial direction of the inner ring (3). One end of the radial pushing screw (73) abuts against the outer wall of the positioning block (6).

3. A circle-fixing mechanism according to claim 2, characterized in that: An anti-slip nut (74) is provided on a threaded sleeve at one end of the radial push screw (73) away from the positioning block (6).

4. A circle-fixing mechanism according to claim 1, characterized in that: The lower end surface of the outer ring (4) is provided with a third threaded hole (43) for threaded locking of a third bolt (67), and a plurality of third threaded holes (43) are provided and distributed along the circumference of the outer ring (4).

5. The circle-fixing mechanism according to claim 1, characterized in that: Both sides of the sink (61) are threadedly connected with circumferential push bolts (68), and the ends of the circumferential push bolts (68) extend into the third adjustment hole (66) and abut against the outer wall of the third bolt (67).

6. A circle-fixing mechanism according to claim 5, characterized in that: The bottom surface of the outer ring (4) is detachably connected to a pair of protective columns (44) located on both sides of the third bolt (67). The protective columns (44) are slidably inserted into the third adjustment hole (66). The protective columns (44) are located between the circumferential push bolt (68) and the third bolt (67). The end of the circumferential push bolt (68) abuts against the outer wall of the protective column (44).

7. A circle-fixing mechanism according to claim 6, characterized in that: The protective column (44) is interference-inserted into the outer ring (4) or threadedly connected to the outer ring (4).

8. The circle-fixing mechanism according to claim 1, characterized in that: The side of the positioning block (6) away from the push block (7) is an arc surface (62) adapted to the outer peripheral wall of the outer ring (4), and the arc surface (62) and the upper plane of the sinking platform (61) are both formed by grinding, and the arc surface (62) and the upper plane of the sinking platform (61) are both provided with stress relief grooves.

9. A weft knitting machine, characterized in that: The invention comprises a circle fixing mechanism as described in any one of claims 1 to 8, and further comprises a base (1), an outer ring (4), an inner ring (3) and a syringe (2), wherein the syringe (2) is rotatably connected to the base (1), the inner ring (3) is coaxially fixedly sleeved on the syringe (2), the support arm (5) is installed on the upper end face of the base (1), the outer ring (4) is sleeved on the inner ring (3), a plurality of triangular seats (41) are installed on the outer ring (4), the bottom surface of the outer ring (4) is in contact with the upper plane of the sinking platform (61), and the outer peripheral wall of the outer ring (4) is in contact with the side wall of the positioning block (6) away from the pushing block (7).

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