A round setting mechanism, a weft knitting machine and a round setting adjustment method

Abstract

A kind of round mechanism and weft knitting machine and round adjustment method, a kind of round mechanism, including support arm, locating block and push block, the upper end surface of support arm is adjustment plane, locating block and push block are connected to adjustment plane, push block is located at the side of locating block away from inner ring, locating block has the sink for the abutment of outer ring, the side wall of locating block away from push block is used for the outer peripheral wall of outer ring abutment fit, the upper end surface of locating block is through first adjusting hole, locating block is provided with first bolt being passed in first adjusting hole and being locked to support arm, the upper end surface of push block is through second adjusting hole, push block is provided with second bolt being passed in second adjusting hole and being locked to support arm, pad is arranged between the lower end surface of locating block and adjustment plane, the upper surface of sink is through third adjusting hole, third adjusting hole is arc-shaped hole, the lower end surface of sink is provided with third bolt being passed in third adjusting hole and being locked to outer ring.

Description

Technical Field

[0001] This application relates to the field of knitting technology, and in particular to a circle-fixing mechanism, a weft knitting machine, and a circle-fixing adjustment method. Background Technology

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

[0003] In existing technology, the outer ring of a weft knitting machine is fixed relative to the frame, and a cam set is installed on the outer ring. The outer ring remains stationary, while the cylinder and inner ring are fixed. The inner ring and cylinder rotate relative to the cam set, thereby driving the needles to move up and down reciprocally. Therefore, the coaxiality of the outer ring relative to the inner ring is extremely critical, affecting the yarn position during knitting and thus the fabric formation. The coaxiality of the outer ring is primarily determined using an externally fixed positioning ring. This positioning ring fixes the outer ring in place, meaning the outer ring remains stationary while the inner ring rotates. The positioning ring has an L-shaped cross-section, meaning it has a stepped surface. The flat surface of the stepped surface is used to press against the bottom surface of the outer ring to adjust its flatness. To ensure the flatness of the outer ring, shims are added to the stepped surface or to the bottom surface of the positioning ring. By adjusting shims of different thicknesses and their alignment with the stepped surface, the flatness of the outer ring is adjusted. The inner ring of the stepped surface fits into the outer circumference of the outer ring. By adjusting the horizontal position of the positioning ring, the position of the outer ring is adjusted so that the outer ring and the inner ring are coaxial. At the same time, the positioning ring can hold the outer ring in place and reduce the deformation of the outer ring, so that the roundness of the outer ring remains stable.

[0004] However, using positioning rings for circle adjustment has the following drawbacks: First, the positioning ring itself has a large diameter, making it difficult to guarantee its roundness and increasing manufacturing difficulty. Due to its large diameter, the positioning ring occupies a large space and is prone to deformation during use, leading to a decrease in its roundness and affecting the circle-fixing accuracy of the outer ring. Therefore, existing positioning rings often have a large cross-section to enhance their structural strength and reduce deformation. Furthermore, because of the large outer diameter of the positioning ring, the machine's columns need to avoid its position, requiring an increase in the diameter of the virtual circle formed by the columns. This increases the overall machine size, raising manufacturing and handling costs and reducing the utilization rate of the production workshop. If clearance holes are made on the positioning ring, allowing the columns to pass through, then the diameter of the virtual circle formed by the columns... While the overall dimensions of the machine remain relatively stable, opening clearance holes on the positioning ring disrupts its stress balance, making it more prone to deformation and loss of roundness. Secondly, since the positioning ring is integrally molded, once it deforms (potentially due to external forces such as handling collisions or natural stress deformation), correcting its roundness becomes more difficult, reducing the accuracy of the outer ring's roundness adjustment. Furthermore, to adjust the density or pattern of the weft-knitted fabric, a small circumferential rotation of the outer ring is required to change the circumferential position of the outer ring and the triangular seat relative to the inner ring. However, this change alters the outer ring's flatness and concentricity, necessitating repeated readjustments (by adjusting the positioning ring's position and the position and number of shims), resulting in low efficiency and requiring further improvement. Summary of the Invention

[0005] To improve the accuracy of the circle adjustment of the outer ring, one of the objectives of this application is to provide a circle adjustment mechanism.

[0006] The circular fixing mechanism provided in this application adopts the following technical solution:

[0007] A circle-fixing mechanism includes support arms, positioning blocks, and pushing blocks. An even number of support arms are distributed around the axis of an inner circle, with pairs of opposing support arms symmetrically arranged along the inner circle axis. The upper surface of each 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 circle. The positioning block has a recessed platform for the outer circle to abut against. The upper surface of the recessed platform is used for the lower end face of the outer circle to abut against. The side wall of the positioning block away from the pushing block is used for the outer peripheral wall of the outer circle to abut against. A first adjustment hole is formed through the upper surface of the positioning block. The positioning block is provided with a through-hole in the first adjustment hole. The first bolt is inserted into the joint hole and locked to the support arm. The upper end face of the push block is provided with a second adjustment hole. The push block is provided with a second bolt that passes through the second adjustment hole and is locked to the support arm. Both the first and second adjustment holes are oblong holes. The length direction of the first and second adjustment holes is parallel to the radial direction of the inner ring. A shim is provided between the lower end face of the positioning block and the adjustment plane. The upper surface of the sinking platform is provided with a third adjustment hole. The third adjustment hole is an arc-shaped hole and the axis of the arc-shaped hole coincides with the axis of the outer ring. The lower end face of the sinking platform is provided with a third bolt that passes through the third adjustment hole and is locked to the outer ring.

[0008] By adopting the above technical solution, in the initial state, the jacking block is connected to the adjustment plane of the support arm, and the second bolt is not tightened, allowing the jacking block to slide and adjust radially. First, the third bolt is tightened to fix the positioning block to the outer ring. At this time, the upper surface of the countersunk platform and the side wall of the positioning block are respectively attached to the bottom surface and outer circumferential surface of the outer ring, so that there is a gapless fit between the outer ring, the countersunk 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 jacking block. At this time, the first bolt is not tightened, allowing the positioning block to slide and adjust radially. The outer ring is adjusted radially by sliding, and then the height of each positioning block is adjusted by adding shims to ensure the flatness of the outer ring meets the requirements. Next, the concentricity of the outer ring is adjusted: by sliding two opposing push blocks, the positioning blocks are pushed and pulled back, thus adjusting the radial displacement of the outer ring. The push blocks are kept in contact with the outer wall of the positioning blocks. An initial concentricity test is performed on the outer ring. After the test meets the requirements, the first and second bolts are tightened to fix the positioning blocks and push blocks. The push blocks provide secondary reinforcement to the positioning blocks and also prevent the positioning blocks from... The outer ring is positioned to improve structural stability and thus enhance its circle-keeping accuracy. Then, the concentricity of the outer ring at different positions is checked: the third bolt is unlocked to release the outer ring from the positioning blocks, a force is applied to the outer ring to make it rotate slightly around its own axis, and the third bolt is tightened. This allows for a second check of the concentricity at this position. If the deviation is large, the positions of each positioning block need to be adjusted again until the outer ring meets the requirements. The third bolt is then unlocked again, and the outer ring is rotated slightly to the next position. The third bolt is then tightened, and a third concentricity check is performed until the outer ring meets the requirements. This process is repeated until the outer ring meets the standards. Once the checks are successful, it can be understood that after adjusting and installing the outer ring, each positioning block has been adjusted to a perfect circle. This means that during subsequent weaving operations, when the outer ring rotates and switches positions, there is no need to move and adjust the positions of the positioning blocks and push blocks, or adjust the number of shims. This greatly saves the circle-keeping adjustment time spent on position switching during operation, significantly improving weaving efficiency. Multiple circular positioning mechanisms are set up and distributed in a dispersed manner, meaning there is sufficient space between the circular positioning mechanisms for the installation of columns, thus eliminating the need to increase the machine size; the positioning blocks and push blocks are small in size, making it easy to process with high precision dimensions, such as flatness and roundness, with low processing difficulty and low cost; due to the high dimensional accuracy of the positioning blocks and push blocks, the dimensional accuracy of the outer ring is also high. The dimensional accuracy of this technical solution can be controlled within 1-2 microns, and it is also less likely to have the problem of deformation and out-of-roundness that is difficult to correct in existing integrated positioning rings.

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

[0010] By adopting the above technical solution, when adjusting the concentricity of the outer ring, first tighten the second bolt to fix the push block relative to the support arm. Then, by rotating the radial push screw, the feed amount of the radial push screw is adjusted. By using the forward and backward movement of the radial push screws on the two opposing push blocks, the radial displacement of the positioning block and the outer ring is adjusted. After the initial concentricity test of the outer ring is performed and meets the test requirements, tighten the first bolt to fix the positioning block. Then, rotate the radial push screw so that the end face of the radial push screw near the positioning block does not protrude from the side of the push block near the positioning block. Move the push block so that the side wall of the push block abuts against the outer wall of the positioning block. Finally, tighten the second bolt to fix the push block, and screw the radial push screw in again so that the end face of the radial push screw abuts against the outer wall of the positioning block. By the two opposing push blocks cooperating and pressing against the positioning block, two opposing external forces are applied to the outer ring, thereby correcting the deformation of the outer ring and ensuring the roundness of the outer ring.

[0011] Preferably, the end of the radial push screw furthest from the positioning block is threaded with an anti-loosening nut.

[0012] By adopting the above technical solution, after the push block abuts against the positioning block and the radial push screw abuts against the positioning block, the anti-loosening nut is screwed on, so that the end face of the anti-loosening nut is pressed against the outer wall of the push block away from the positioning block. The addition of the anti-loosening nut can provide secondary reinforcement to the radial push screw, effectively preventing the radial push screw from loosening after it has been rotated, and maintaining the pushing effect of the radial push screw on the positioning block.

[0013] Preferably, the lower end face of the outer ring is provided with a third threaded hole for the third bolt to be threaded and locked, and multiple third threaded holes are provided and distributed along the circumference of the outer ring.

[0014] By adopting the above technical solution, multiple third threaded holes are provided and arranged at intervals along the outer ring circumference. The purpose is that, due to different fabrics (such as sweatshirts or towels), the outer ring needs to be adjusted circumferentially by a large range. Therefore, by setting multiple third threaded holes, even if the circumferential movement distance of the outer ring is too large, some third threaded holes will still be within the range of the arc-shaped hole for the third bolt to engage and lock.

[0015] Preferably, both sides of the recessed platform are threaded with circumferential push bolts, and the ends of the circumferential push 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 outer ring needs to be rotated and switched in the circumferential position, the third bolt is first loosened so that the third bolt is only locked to the outer ring. After the end face of the nut of the third bolt is separated from the lower plane of the countersunk platform, the two circumferential push bolts are tightened or loosened in coordination. That is, when one circumferential push bolt is screwed in, it will abut and push the third bolt. At this time, the other circumferential push bolt is loosened and retracted to provide rotation and sliding space for the third bolt. The screwed-in circumferential push 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 adjustment of the outer ring's circle or the adjustment in actual production and processing. After the outer ring has completed 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 posts located on both sides of the third bolt. The protective posts are slidably inserted through the third adjustment hole. The protective posts are located between the circumferential push bolt and the third bolt, and the end of the circumferential push bolt abuts against the outer wall of the protective post.

[0018] By adopting the above technical solution, when switching the circumferential position of the outer ring, the third bolt, after being loosened, has poor fit strength with the outer ring. When adjusting the circumferential position of the outer ring, the circumferential push bolt directly pushes against the third bolt. When the third bolt is subjected to lateral force, it will tilt and push the outer ring to complete the circumferential movement. At this time, the circumferential push bolt still maintains pressure on the third bolt. After the outer ring position is adjusted, during the tightening of the third bolt, the force of the third bolt will be applied in the opposite direction to the circumferential push bolt. Since the circumferential push bolt is fixed to the positioning block, the force is applied to the positioning block, causing the positioning block to shift relative to the support arm, resulting in failure of the fixed circle or damage to the positioning block. Therefore, protective posts are added on both sides of the third bolt. The circumferential push bolt pushes against the protective posts to complete the circumferential movement of the outer ring, effectively avoiding direct pushing against the third bolt, thus preventing the tilting of the third bolt. After the outer ring completes the circumferential position adjustment, the third bolt is tightened.

[0019] Preferably, the protective post is interference-fitted into the outer ring or threaded into 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. Both the arc surface and the upper surface of the countersink are formed by grinding. Both the arc surface and the upper surface of the countersink are provided with stress-reducing grooves.

[0021] By adopting the above technical solution, the arc surface of the positioning block and the upper surface of the countersink are both formed by grinding, resulting in good surface roughness and dimensional accuracy. Stress-reducing grooves are provided on the arc surface and the upper surface of the countersink, which effectively reduces the processing difficulty and processing error, and improves the fitting accuracy of the outer ring, the countersink, and the positioning block.

[0022] To improve the accuracy of the outer circle adjustment, the second objective 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, the inner ring is coaxially fixedly sleeved on the needle cylinder, a support arm is installed on the upper end face of the base, the outer ring is sleeved on the inner ring, a plurality of triangular seats are installed on the outer ring, the bottom surface of the outer ring is in contact with the upper plane of the countersink, and the outer peripheral wall of the outer ring is in contact with the side wall of the positioning block away from the push block.

[0024] To improve the accuracy of the fixed circle adjustment of the outer ring, a third objective of this application is to provide a fixed circle adjustment method.

[0025] A method for adjusting a fixed circle includes:

[0026] Adjusting the flatness of the outer ring: First, tighten the third bolt to fix the positioning block to the outer ring, so that the upper surface of the countersunk platform and the side wall of the positioning block are respectively attached to the bottom surface and outer circumference of the outer ring, thus making the outer ring, the countersunk platform, and the positioning block fit without gaps. Then, place the positioning block and the push block on the adjustment plane of the support arm, so that the outer ring is fitted onto the inner ring, with a gap between the outer ring and the inner ring, and the first bolt and the second bolt are inserted. There is an adjustment gap between the positioning block and the push block. At this time, the first bolt and the second bolt are not tightened, so that the positioning block together with the outer ring can slide and adjust along the radial direction of the inner ring. Then, adjust the height of each positioning block by adding shims between the lower end face of the positioning block and the adjustment plane. The flatness of the outer ring is tested by a precision measuring instrument to ensure that the flatness of the outer ring meets the requirements.

[0027] To adjust the concentricity of the outer ring: Two opposing push blocks slide and adjust, pushing and pulling the positioning block to achieve radial displacement adjustment of the outer ring. The push blocks are kept in contact with the outer wall of the positioning block. An initial concentricity test is performed on the outer ring using a precision testing instrument. Once the test meets the requirements, the first and second bolts are tightened to fix the positioning block and push blocks. Next, the concentricity of the outer ring is tested at different positions: the third bolt is unlocked to release the outer ring from the positioning block, and a force is applied to the outer ring to make it rotate slightly around its own axis. The third bolt is then tightened, and a second concentricity test is performed at that position. If the deviation is large, the positions of each positioning block need to be adjusted again until the outer ring meets the test requirements. The third bolt is then unlocked again, and the outer ring is rotated slightly to the next position. The third bolt is then tightened, and a third concentricity test is performed until the outer ring meets the test requirements. This process is repeated until the outer ring meets the requirements. Once the test is passed, normal weaving work can begin.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. Using the jacking block to reinforce the positioning block a second time can also prevent the positioning block from shifting, improve the structural stability of the outer ring after adjustment, and thus improve the circle positioning accuracy of the outer ring;

[0030] 2. After adjusting and installing the outer ring, each positioning block has been adjusted to a perfect circle. This means that when the outer ring rotates and switches positions in subsequent work, there is no need to move and adjust the positions of each positioning block and the push block. This greatly saves the time spent on adjusting the circle when the outer ring switches positions during work, and greatly improves work efficiency.

[0031] 3. Multiple circular positioning mechanisms are set up and distributed in a dispersed manner, meaning there is sufficient space between the circular positioning mechanisms for the installation of columns, thus eliminating the need to increase the machine size; the positioning blocks and push blocks are small in size, making it easy to process with high precision dimensions, such as flatness and roundness, with low processing difficulty and low cost; due to the high dimensional accuracy of the positioning blocks and push blocks, the dimensional accuracy of the outer ring is also high. The dimensional accuracy of this technical solution can be controlled within 1-2 microns, and it is also less likely to have the problem of deformation and out-of-roundness that is difficult to correct in existing integrated positioning rings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of a weft knitting machine in Example 1.

[0033] Figure 2 This is a schematic diagram of the connection structure between the outer ring and the triangular seat in Example 1.

[0034] Figure 3 This is a schematic diagram of the fixed circle mechanism in Example 1.

[0035] Figure 4 This is a schematic diagram of the connection structure between the outer ring and the positioning block in Example 1.

[0036] Figure 5 This is a schematic diagram of the push block in Example 1.

[0037] Figure 6 This is a schematic diagram of the protective column in Example 2.

[0038] Explanation of reference numerals in the attached drawings: 1. Base; 2. Syringe; 3. Inner ring; 4. Outer ring; 41. Triangular seat; 42. Step; 43. Third threaded hole; 44. Protective post; 5. Support arm; 51. Fixing block; 52. Slanted arm; 53. Support block; 54. Adjustment plane; 55. Shim; 56. First threaded hole; 57. Second threaded hole; 6. Positioning block; 61. Countersunk platform; 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-loosening nut; 75. Abutting convex surface; 76. Second nut. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0040] Example 1:

[0041] This application discloses a weft knitting machine, referring to... Figure 1 The device includes a base 1, a syringe 2 coaxially rotatably connected to the upper end face 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-fixing mechanism disposed on the base 1 for adjusting the outer ring 4. Multiple 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 will not be described in detail here.

[0042] Reference Figure 1 , Figure 2 The lower part of the inner circumferential wall of the outer ring 4 has a protruding step 42 for mounting the triangular seat 41. The triangular seat 41 is locked to the top surface of the step 42 of the outer ring 4 by bolts. The fixed circle mechanism is provided with an even number of groups and distributed around the axis of the inner ring 3. The fixed circle mechanisms are arranged symmetrically along the axis of the inner ring 3 in pairs. The number of fixed circle mechanisms is four, six or eight. In this embodiment, six fixed circle mechanisms are preferred.

[0043] Reference Figure 2 , Figure 3Each set of circle-fixing mechanisms includes a support arm 5, a positioning block 6, and a pushing block 7. The support arm 5 includes a fixing block 51 bolted to the upper surface of the base 1, an inclined arm 52 fixedly connected to the fixing block 51, and a support block 53 fixedly connected to the upper surface of the inclined arm 52. The upper end of the inclined arm 52 is inclined towards the axis of the inner ring 3. The upper surface of the support block 53 is an adjustment plane 54. The positioning block 6 and the pushing block 7 are both connected to the adjustment plane 54. The pushing block 7 is located on the side of the positioning block 6 away from the inner ring 3. The positioning block 6 has a recessed platform 61 for the outer ring 4 to abut against. The side of the positioning block 6 away from the push block 7 is an arc surface 62 that fits the outer peripheral wall of the outer ring 4. Both the arc surface 62 and the upper surface of the recessed platform 61 are ground and formed. Stress-reducing grooves are provided in the middle of the arc surface 62 and the upper surface of the recessed platform 61. The bottom surface of the outer ring 4 is in contact with the upper surface of the recessed platform 61, and the outer peripheral wall of the outer ring 4 is in contact with the arc surface 62, so that there is a gapless fit between the outer ring 4, the recessed platform 61, and the positioning block 6.

[0044] Reference Figure 3 , Figure 4 A shim 55 is placed between the lower end face of the positioning block 6 and the adjustment plane 54. A first adjustment hole 63 is provided through the upper end face of the positioning block 6. The first adjustment hole 63 is an oblong hole, and its length direction is parallel to the radial direction of the inner ring 3. A first bolt 64 is provided on the upper end face of the positioning block 6, which passes through the first adjustment hole 63 and is locked to the support block 53. In this embodiment, the first bolt 64 has an optical axis section passing through the first adjustment hole 63 and a threaded section passing through the shim 55 and the support block 53. The outer diameter of the optical axis section of the first bolt 64 is larger than the outer diameter of the threaded section. A first threaded hole 56 is provided through the upper end face of the support block 53 for threaded connection of the first bolt 64. A first nut 65 is threadedly locked to the lower end face of the support block 53 on the threaded section of the first bolt 64. When the first bolt 64 is not fully locked, the positioning block 6 can slide radially along the inner ring 3 on the adjustment plane 54.

[0045] Reference Figure 4 , Figure 5Two abutting protrusions 75 are fixed to the side wall of the push block 7 near the positioning block 6. The abutting protrusions 75 abut against the outer side wall of the positioning block 6. A second adjustment hole 71 is provided through the upper end face of the push block 7. The second adjustment hole 71 is an oblong 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, which are symmetrically distributed along the center line of the width of the first adjustment hole 63. A second bolt 72 is provided through the second adjustment hole 71 and locked to the support block 53 on the upper end face of the push block 7. In this embodiment, the second bolt 72 has an optical axis section through the second adjustment hole 71 and a threaded section 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. A second threaded hole 57 is provided through the upper end face of the support block 53 for the second bolt 72 to be threadedly connected. A second nut 76 is threadedly locked to the lower end face of the support block 53 on the threaded section of the second bolt 72. When the second bolt 72 is not fully tightened, the push block 7 can slide radially along the inner ring 3 on the adjustment plane 54.

[0046] The push block 7 is equipped 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, and its axial direction is parallel to the length direction of the first adjusting hole 63. The radial push screw 73 is located between the two second adjusting holes 71 and between the two abutting protrusions 75. One end of the radial push screw 73 abuts against the outer wall of the positioning block 6. The end face of the radial push screw 73 away from the positioning block 6 has a rotating groove along its axial direction. The radial push screw 73 can be rotated by inserting an Allen wrench into the rotating groove. The end of the radial push screw 73 away from the positioning block 6 is threaded with an anti-loosening nut 74.

[0047] A third adjustment hole 66 is provided through the bottom wall of the stress-reducing groove of the recessed platform 61. 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. A third bolt 67 is provided on the lower end face of the recessed platform 61, which passes through the third adjustment hole 66 and is locked to the outer ring 4. In this embodiment, the third bolt 67 has a smooth axis section passing through the third adjustment hole 66 and a threaded section passing through the outer ring 4. The outer diameter of the smooth axis section of the third bolt 67 is larger than the outer diameter of the threaded section. A third threaded hole 43 is provided on the lower end face of the outer ring 4 for the threaded locking of the third bolt 67. Multiple third threaded holes 43 are provided and distributed along the circumference of the outer ring 4. Both sides of the recessed platform 61 are threadedly connected to circumferential push bolts 68. Both side walls of the recessed platform 61 are provided with fourth threaded holes that communicate with the third adjustment hole 66 for the threaded connection of the circumferential push bolts 68. Both sides of the recessed platform 61 are threaded with circumferential push bolts 68, the ends of which extend into the third adjusting hole 66 and abut against the outer wall of the third bolt 67.

[0048] This application also discloses a method for adjusting a fixed circle, including:

[0049] Adjust the flatness of the outer ring 4: First, tighten the third bolt 67 so that the end face of the nut of the third bolt 67 abuts against the lower end face of the countersunk platform 61, thereby fixing the positioning block 6 to the outer ring 4, so that the upper surface of the countersunk platform 61 and the side wall of the positioning block 6 respectively fit against the bottom surface and the outer circumferential surface of the outer ring 4, thereby ensuring a gapless fit between the outer ring 4, the countersunk platform 61, and the positioning block 6; then place the positioning block 6 and the push block 7 on the adjustment plane 54 of the support arm 5, so that the outer ring 4 is fitted onto the inner ring 3, and the outer ring 4 and the inner ring 3 are fitted together. The ring 3 has a gap and a first bolt 64 and a second bolt 72 are inserted through it. There is an adjustment 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 together with the outer ring 4 can slide and adjust radially along the inner ring 3. Then, the height of each positioning block 6 is adjusted by adding a shim 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 testing instrument to ensure that the flatness of the outer ring 4 meets the requirements.

[0050] To 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. By using the forward and backward movement of the radial push screw 73 on the two opposing push blocks 7, the positioning block 6 and the outer ring 4 are pushed to slide and adjust radially together. 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. The concentricity is tested by a precision testing instrument to ensure that the concentricity of the outer ring 4 meets the requirements at a certain circumferential position.

[0051] After the initial concentricity test of the outer ring 4 is performed and meets the test requirements, the first bolt 64 is tightened to fix the positioning block 6. Then, the second bolt 72 is loosened to release the fixation of the push block 7, and the radial push screw 73 is rotated so that the end face of the radial push screw 73 near the positioning block 6 does not protrude from the side of the push block 7 near the positioning block 6. The push block 7 is then moved so that the abutting protrusion 75 on the push block 7 abuts against the outer wall of the positioning block 6. Then, the second bolt 72 is tightened to fix the push block 7, and the radial push screw 73 is screwed in again so that the end face of the radial push screw 73 abuts against the outer wall of the positioning block 6. That is, the push block 7 forms a three-point abutment with the positioning block 6, and the two opposing push blocks 7 cooperate to push against the positioning block 6 to apply two opposing external forces to the outer ring 4, reducing the possibility of deformation of the outer ring 4 and ensuring the roundness of the outer ring 4.

[0052] The concentricity of the outer ring 4 at different positions is checked: First, loosen the third bolt 67 so that it is only locked onto the outer ring 4. After the nut end face of the third bolt 67 is detached from the lower plane of the countersunk platform 61, release the fixation of the outer ring 4 relative to the positioning block 6. Through the tightening or loosening of the two circumferential push bolts 68, that is, when one of the circumferential push bolts 68 is screwed in, it abuts against and pushes the third bolt 67. At this time, the other circumferential push bolt 68 is loosened and retracted, providing rotational sliding space for the third bolt 67. The screwed-in circumferential push bolt 68 pushes... Push the third bolt 67 to move the outer ring 4 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 switch, tighten the third bolt 67 and perform a second test on the concentricity of the outer ring 4 at this position. At this time, the flatness and concentricity of the outer ring 4 may change, or they may not change, or the change may be within the allowable range (the allowable error range is 1-2 microns). When 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.

[0053] Multiple circumferential position switching and multiple tests and adjustments are performed on the outer ring 4: the third bolt 67 is unlocked again, and the circumferential position of the outer ring 4 is finely adjusted again so that the outer ring 4 rotates slightly to the next position. The third bolt 67 is locked, and the concentricity is checked for the third time until the outer ring 4 meets the test requirements. This process is repeated multiple times. After the test meets the standard, the anti-loosening nut 74 is screwed onto the tail end of the radial push screw 73 so that the end face of the anti-loosening nut 74 is pressed against the outer wall of the push block 7 away from the positioning block 6, maintaining the pushing effect of the radial push screw 73 on the positioning block 6. The first nut 65 is screwed onto the lower end of the threaded section of the first bolt 64, and the second nut 76 is screwed onto the lower end of the threaded section of the second bolt 72. Then, normal weaving work can begin. This can be understood as follows: after adjusting and installing the outer ring 4, each positioning block 6 has been adjusted to a perfect circle state. This means that after the outer ring 4 rotates and switches positions in subsequent weaving operations, there is no need to move and adjust the positions of each positioning block 6 and the push block 7, or adjust the number of shims 55. This greatly saves the time spent on adjusting the circle when the outer ring 4 switches positions during operation, and greatly improves the efficiency of weaving work.

[0054] When testing the flatness and concentricity of the outer ring 4, the precision measuring instrument is fixed to the inner ring 3. The jumper of the precision measuring instrument is at the corresponding position on the outer ring 4. When the inner ring 3 rotates, the jumper of the precision measuring instrument moves on the corresponding surface of the outer ring 4 to measure the runout value. If the runout value is within the allowable deviation, the adjustment is successful.

[0055] Example 2:

[0056] 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 both sides of the third bolt 67. The protective posts 44 are slidably inserted into the third adjusting hole 66. The protective posts 44 are either interference-fitted into the outer ring 4 or threaded into the outer ring 4. In this embodiment, a fifth threaded hole is provided between two adjacent third threaded holes 43, and the protective posts 44 are threaded into the fifth threaded hole. The protective posts 44 are located between the circumferential push bolt 68 and the third bolt 67. The end of the circumferential push bolt 68 extends into the third adjusting hole 66 and abuts against the outer wall of the protective posts 44.

[0057] When switching the circumferential position of the outer ring 4, because the third bolt 67 is loosened, the fit strength between the third bolt 67 and the outer ring 4 is poor. When adjusting the circumferential position of the outer ring 4, the circumferential push bolt 68 directly pushes against 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 push bolt 68 still maintains pressure on the third bolt 67. After the position of the outer ring 4 is adjusted, during the tightening of the third bolt 67, the force of the third bolt 67 will be applied in the opposite direction to the circumferential position. The circumferential jacking bolt 68 is fixed to the positioning block 6, meaning that the force is applied to the positioning block 6, causing the positioning block 6 to shift relative to the support arm 5, resulting in failure of the fixed circle or damage to the positioning block 6. Therefore, protective posts 44 are added on both sides of the third bolt 67, meaning that the circumferential jacking bolt 68 pushes on the protective posts 44 to complete the circumferential movement of the outer ring 4, effectively avoiding direct jacking on the third bolt 67, thus preventing the third bolt 67 from tilting. After the outer ring 4 completes the circumferential position adjustment, the third bolt 67 is tightened.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fixed-circle mechanism, characterized in that: The device includes a support arm (5), a positioning block (6), and a push block (7). The support arm (5) is provided in an even number and distributed around the axis of the inner ring (3). The support arms (5) are symmetrically arranged in pairs along the axis of the inner ring (3). 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). 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 recess (61) for the outer ring (4) to abut. The upper surface of the recess (61) is used for the lower end surface of the outer ring (4) to fit and abut. 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 fit. The upper end surface of the positioning block (6) is provided with a first adjustment hole (63). The positioning block (6) is provided with a locking device that passes through the first adjustment hole (63). The first bolt (64) is attached to the support arm (5). The upper end face of the push block (7) is provided with a second adjustment hole (71). 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 arm (5). The first adjustment hole (63) and the second adjustment hole (71) are both waist-shaped holes. The length direction of the first adjustment hole (63) and the second adjustment hole (71) is parallel to the radial direction of the inner ring (3). A shim (55) is provided between the lower end face of the positioning block (6) and the adjustment plane (54). The upper plane of the sink platform (61) is provided with a third adjustment hole (66). 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 face of the sink platform (61) is provided with a third bolt (67) that passes through the third adjustment hole (66) and is locked to the outer ring (4).

2. The circle-fixing mechanism according to claim 1, characterized in that: 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 radial direction of the inner ring (3). One end of the radial push screw (73) abuts against the outer wall of the positioning block (6).

3. A circle-fixing mechanism according to claim 2, characterized in that: The radial push screw (73) is threaded with an anti-loosening nut (74) at the end away from the positioning block (6).

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

5. A circle-fixing mechanism according to claim 1, characterized in that: Both sides of the settling platform (61) are threaded with circumferential push bolts (68), the ends of which 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 1, characterized in that: Both sides of the recessed platform (61) are threaded with circumferential push bolts (68). The bottom surface of the outer ring (4) is detachably connected with a pair of protective posts (44) located on both sides of the third bolt (67). The protective posts (44) slide through the third adjustment hole (66). The protective posts (44) are located between the circumferential push bolts (68) and the third bolt (67). The end of the circumferential push bolts (68) abuts against the outer wall of the protective posts (44).

7. A circle-fixing mechanism according to claim 6, characterized in that: The protective post (44) is either interference-fitted to the outer ring (4) or threaded to the outer ring (4).

8. A 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). The upper surface of the arc surface (62) and the sinker (61) are both formed by grinding. The upper surface of the arc surface (62) and the sinker (61) are both provided with stress-reducing grooves.

9. A weft knitting machine, characterized in that: The fixed circle mechanism according to any one of claims 1-8 further includes a base (1), an outer ring (4), an inner ring (3), and a syringe (2). 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 attached to the upper plane of the sinking platform (61), and the outer peripheral wall of the outer ring (4) is attached to the side wall of the positioning block (6) away from the push block (7).

10. A method for adjusting the circle of a circle-fixing mechanism according to any one of claims 1-8, characterized in that: include: Adjust the flatness of the outer ring (4): First, tighten the third bolt (67) to fix the positioning block (6) to the outer ring (4), so that the upper surface of the countersunk platform (61) and the side wall of the positioning block (6) are respectively attached to the bottom surface and the outer circumferential surface of the outer ring (4), so that the outer ring (4), the countersunk platform (61), and the positioning block (6) are in a gapless fit. Then, place the positioning block (6) and the push block (7) on the adjustment plane (54) of the support arm (5), so that the outer ring (4) is fitted onto the inner ring (3), with a gap between the outer ring (4) and the inner ring (3), and passing through. Assume there is an adjustment gap between the first bolt (64) and the second bolt (72), the positioning block (6) and the push block (7). At this time, neither the first bolt (64) nor the second bolt (72) is tightened, so that the positioning block (6) together with the outer ring (4) can slide and adjust radially along the inner ring (3). Then, the height of each positioning block (6) is adjusted by adding a shim (55) between the lower end face of the positioning block (6) and the adjustment plane (54). The flatness of the outer ring (4) is tested by a precision testing instrument to ensure that the flatness of the outer ring (4) meets the requirements. Adjust the concentricity of the outer ring (4): Use the sliding cooperation of two opposing push blocks (7) to adjust the radial displacement of the outer ring (4) by pushing and pulling the positioning block (6). Keep the push block (7) always in contact with the outer wall of the positioning block (6). Perform the initial concentricity test on the outer ring (4) using a precision testing instrument. After the test meets the requirements, tighten the first bolt (64) and the second bolt (72) to fix the positioning block (6) and the push block (7). Then, test the concentricity of the outer ring (4) at different positions: Unlock the third bolt (67) to release the fixation of the outer ring (4) relative to the positioning block (6). Apply force to the outer ring (4) to make it rotate around its own axis for fine adjustment, and tighten the third bolt (67) to perform a second test on the concentricity of the outer ring (4) at this position. If the test deviation is large, the position of each positioning block (6) needs to be adjusted again until the outer ring (4) meets the test requirements. Unlock the third bolt (67) again, rotate the outer ring (4) again to make it rotate slightly to the next position, tighten the third bolt (67), and perform a third test on the concentricity until the outer ring (4) meets the test requirements. Repeat the test and adjustment in this way. After the test meets the standard, normal weaving work can begin.

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