Circle setting mechanism, weft knitting machine and circle setting adjusting method

Abstract

The circle setting 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 for abutting against an outer ring, and the sinking table is provided with an adjusting 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, a weft knitting machine, and a circle-fixing adjustment method. 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 the weft knitting machine is fixed relative to the frame, the triangular seat is installed on the outer ring, the outer ring is stationary, the needle cylinder is fixed to the inner ring, the inner ring and the needle cylinder rotate relative to the triangular seat, thereby driving the knitting needle to move up and down, that is, 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. For the positioning of the coaxiality of the outer ring, an external fixed positioning ring is mainly used. The positioning ring fixes the outer ring, that is, the outer ring is stationary, and the inner ring rotates. The cross-section of the positioning ring is L-shaped, that is, the positioning ring has a step surface, and the plane of the step surface is used to resist the bottom surface of the outer ring to adjust the flatness of the outer ring. In order to ensure the flatness of the outer ring, a pad will be added on the plane of the step surface, or a pad will be added on the bottom surface of the positioning ring. The pads of different thicknesses are adjusted and then matched with the plane of the step surface to adjust the flatness of the outer ring. The inner ring surface of the step surface fits the outer circumference of the outer ring. The position of the outer ring is adjusted by adjusting the horizontal position of the positioning ring 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 ensure, 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 and thus reduce 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 machine manufacturing cost and transportation cost, 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, although the diameter of the virtual circle formed by the columns is 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 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 outer ring circle adjustment. 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 the position and number of the gasket). The adjustment efficiency is low, so it needs further improvement. Summary of the invention

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

[0006] The circular positioning mechanism provided in this application adopts the following technical solution: A circle fixing mechanism comprises a support arm, a positioning block and a push block, wherein an even number of support arms are provided and distributed around the axis of an inner ring, and two opposing support arms are symmetrically arranged along the axis of the inner ring, and the upper end surface of the support arm is an adjustment plane, and the positioning block and the push block are both connected to the adjustment plane, and the push block is located on the side of the positioning block away from the inner ring, and the positioning block has a sinking platform for the outer ring to abut, and the upper plane of the sinking platform is used for the lower end surface of the outer ring to abut, and the side wall of the positioning block away from the push block is used for the outer peripheral wall of the outer ring to abut, and a first adjustment hole is opened through the upper end surface of the positioning block, and the positioning block is provided with a hole penetrating through the first adjustment hole. A first bolt is provided on the support arm and is locked with a node hole, a second adjusting hole is penetrated through the upper end surface of the push block, and the push block is provided with a second bolt which is penetrated through the second adjusting hole and is locked with the support arm, the first adjusting hole and the second adjusting hole are both waist-shaped holes, and 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 through the upper plane of 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, and the lower end surface of the sinking platform is provided with a third bolt which is penetrated through the third adjusting hole and is locked with the outer ring.

[0007] 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 sinker and the side wall of the positioning block are respectively attached to the bottom surface and the outer peripheral surface of the outer ring, so that the outer ring and the sinker and the positioning block are matched without clearance. 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 Slide along the radial direction for adjustment, 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 two opposite push blocks to realize the radial displacement adjustment of the outer ring by pushing and retreating the positioning block, keep the push block always in contact with the outer wall of the positioning block, and 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 push block. Use the push block to reinforce the positioning block for the second time, which can also prevent the positioning block from The third bolt is unlocked to release the fixation of the outer ring relative to the positioning block, and a force is applied to the outer ring to make the outer ring rotate around its own axis for fine adjustment, and the third bolt is locked, so as to perform a second detection of the concentricity of the outer ring at this position. When the detection deviation is large, it is necessary to adjust the position of each positioning block again until the outer ring meets the detection requirements, unlock the third bolt again, rotate the outer ring again, so that the outer ring rotates slightly to the next position, lock the third bolt, and perform three concentricity tests until the outer ring meets the detection requirements. Repeat the detection and adjustment by analogy. After the detection meets the standard, it can be understood that after the outer ring is adjusted and installed, each positioning block has been debugged to a perfect circle state, so that after the outer ring is rotated and switched in position in the subsequent weaving operation, there is no need to move and adjust the position of each positioning block and the push block and the number of adjustment gaskets. This greatly saves the time spent on the circle adjustment when the outer ring switches its position during work, and greatly improves the weaving work efficiency. There are multiple circle-fixing mechanisms, which are dispersedly arranged, that is, there is enough space between the circle-fixing mechanisms for installing the columns, so there is no need to increase the size of the machine; the positioning block and the push block 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 block and the push block 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 one-piece positioning ring.

[0008] Preferably, the pushing block is provided with a radial pushing screw for driving the positioning block to slide, the radial pushing screw thread is penetrated 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.

[0009] By adopting the above technical scheme, 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 radial push screw is rotated to adjust the feed amount of 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 detection of the outer ring is performed and meets the detection 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, and the push block is moved so that the side wall of the push block is 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 is against the outer wall of the positioning block, and the two opposing push blocks cooperate to press against the positioning block to apply two opposing external forces to the outer ring, thereby correcting the deformation of the outer ring and ensuring the roundness of the outer ring.

[0010] Preferably, an anti-slip nut is provided on a threaded sleeve at one end of the radial push screw away from the positioning block.

[0011] 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, and an anti-slip nut is added. 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.

[0012] Preferably, a third threaded hole for threaded locking of a third bolt is provided 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.

[0013] 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 plurality. Even if the circumferential movement distance of the outer ring is too large, some of the third threaded holes are still within the range of the arc hole, so as to be locked with the third bolt.

[0014] 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.

[0015] By adopting the above technical solution, when it is necessary to switch the circumferential position of the outer ring, first loosen the third bolt 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 lower plane of the sinker, the two circumferential push bolts are tightened or loosened, that is, when one of the circumferential push bolts is screwed in, it will abut and push the third bolt. At this time, the other circumferential push bolt is loosened and retreated to provide rotation and sliding space for the third bolt. The screwed-in circumferential push bolt pushes the third bolt to drive 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 circle adjustment or the actual production and processing adjustment. After the circumferential position adjustment of the outer ring is completed, the third bolt is tightened.

[0016] Preferably, the bottom surface of the outer ring is detachably connected to a pair of protective columns respectively located on both sides of the third bolt, the protective columns are slidably inserted into 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.

[0017] By adopting the above technical scheme, when the circumferential position of the outer ring is switched, the matching 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 push 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 push bolt still maintains the push pressure on the third bolt. After the outer ring position is adjusted, in the process of tightening the third bolt, the force of the third bolt will be applied to the circumferential push bolt in the reverse direction, and the circumferential push bolt and the positioning block are fixed, that is, the force is applied to the positioning block, thereby 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 columns are added on both sides of the third bolt, that is, the circumferential push bolt pushes on the protective column to complete the circumferential movement of the outer ring, effectively avoiding direct pushing 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.

[0018] Preferably, the protective column is interference-inserted into the outer ring or threadedly connected to the outer ring.

[0019] 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.

[0020] By adopting the above technical solution, the arc surface of the positioning block and the upper plane of the sinker are both formed by grinding, and their surface roughness and dimensional accuracy are good. The arc surface and the upper plane of the sinker are provided with stress reducing grooves, which effectively reduce the processing difficulty and processing errors, and improve the matching accuracy of the outer ring, sinker and positioning block.

[0021] In order to improve the circularity adjustment accuracy of the outer ring, the second purpose of the present application is to provide a weft knitting machine.

[0022] 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, the support arm is installed on the upper end surface 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 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.

[0023] In order to improve the circle adjustment accuracy of the outer ring, the third purpose of the present application is to provide a circle adjustment method.

[0024] A method for adjusting a fixed circle, comprising: Adjust the flatness of the outer ring: first tighten the third bolt to fix the positioning block to the outer ring, so that the upper plane of the sinking platform and the side wall of the positioning block are respectively fitted to the bottom surface and the outer peripheral surface of the outer ring, so that the outer ring and the sinking platform, as well as the positioning block, are matched without clearance. Then place the positioning block and the push block on the adjustment plane of the support arm, so that the outer ring is sleeved on the inner ring, and there is a gap between the outer ring and the inner ring. The first bolt and the second bolt are inserted, and 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 and the outer ring can slide and adjust along the radial direction of the inner ring. Then, the height of each positioning block is adjusted by adding a gasket between the lower end face of the positioning block and the adjustment plane. The flatness of the outer ring is detected by a precision detector, so that the flatness of the outer ring meets the requirements. Adjust the concentricity of the outer ring: use the sliding cooperation adjustment of the two opposing push blocks to realize the radial displacement adjustment of the outer ring by pushing and retreating the positioning block, keep the push block always in contact with the outer wall of the positioning block, and use the precision detector to 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 push block. Then, test the concentricity of the outer ring at different positions: unlock the third bolt, release the fixation of the outer ring relative to the positioning block, apply force to the outer ring to make the outer ring rotate around its own axis for fine adjustment, and lock the third bolt, so as to perform a secondary test on the concentricity of the outer ring at this position. When the test deviation is large, it is necessary to adjust the position of each positioning block again until the outer ring meets the test requirements, unlock the third bolt again, rotate the outer ring again, so that the outer ring rotates slightly to the next position, lock the third bolt, and perform three tests on the concentricity until the outer ring meets the test requirements. Repeat the test and adjustment by analogy. After the test meets the standards, normal weaving work can be started.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 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; 2. After the outer ring is adjusted and installed, each positioning block has been debugged to a perfect circle state, so that after 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 the circle adjustment when the outer ring is switched during work, and greatly improves work efficiency; 3. Multiple circle-fixing mechanisms are provided and dispersedly distributed, that is, there is enough space between the circle-fixing mechanisms for installing the columns, so there is no need to increase the size of the machine; the positioning block and the push block 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 block and the push block 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 one-piece positioning ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a weft knitting machine in Example 1.

[0027] Figure 2 It is a schematic diagram of the connection structure between the outer ring and the triangular seat in Example 1.

[0028] Figure 3 It is a structural schematic diagram of the circle-fixing mechanism in Example 1.

[0029] Figure 4 It is a schematic diagram of the connection structure between the outer ring and the positioning block in Example 1.

[0030] Figure 5 It is a schematic structural diagram of the push block in Example 1.

[0031] Figure 6 It is a schematic diagram of the structure of the protective column in Example 2.

[0032] 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. fixing block; 52. inclined arm; 53. support block; 54. adjustment plane; 55. gasket; 56. first threaded hole; 57. second threaded hole; 6. positioning block; 61. sinker; 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. abutting convex surface; 76. second nut. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] Embodiment 1: The present application embodiment discloses a weft knitting machine, referring to Figure 1 , comprising a base 1, a syringe 2 coaxially rotatably 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 arranged on the base 1 to adjust the circle of the outer ring 4. A plurality of triangular seats 41 are installed on the outer ring 4. The syringe 2, the inner ring 3 and the triangular seats 41 are all existing technologies and are not described in detail here.

[0035] Reference Figure 1 , Figure 2 The lower part of the inner peripheral wall of the outer ring 4 is protruding and fixed with a step 42 for the installation of the triangular seat 41, and the triangular seat 41 is bolted to the top surface of the step 42 of the outer ring 4. The circular fixing mechanism is arranged in an even number of groups and distributed around the axis of the inner ring 3. The circular fixing mechanisms facing each other are symmetrically arranged along the axis of the inner ring 3. The number of the circular fixing mechanisms is four, six or eight groups. In this embodiment, the circular fixing mechanisms are preferably six groups.

[0036] Reference Figure 2 , Figure 3 Each set of circle fixing mechanism includes a support arm 5, a positioning block 6 and a push block 7. The support arm 5 includes a fixed block 51 fixed to the upper end surface of the base 1 by bolts, an inclined arm 52 fixedly connected to the fixed block 51, and a support block 53 fixedly connected to the upper end surface of the inclined arm 52. The upper end of the inclined arm 52 is inclined close to the axis direction of the inner ring 3. The upper end surface 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 sinker 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 adapted to the outer peripheral wall of the outer ring 4. The arc surface 62 and the upper plane of the sinker 61 are both formed by grinding. The middle of the arc surface 62 and the upper plane of the sinker 61 are provided with stress reducing grooves. The bottom surface of the outer ring 4 fits against the upper plane of the sinker 61, and the outer peripheral wall of the outer ring 4 fits against the arc surface 62, so that the outer ring 4 and the sinker 61 and the positioning block 6 are fitted without gap.

[0037] Reference Figure 3 , Figure 4A gasket 55 is provided between the lower end surface of the positioning block 6 and the adjustment plane 54. A first adjustment hole 63 is provided through the upper end surface of the positioning block 6. The first adjustment hole 63 is a waist-shaped hole. The length direction of the first adjustment hole 63 is 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, which is penetrated through the first adjustment hole 63 and locked to the support block 53. In this embodiment, the first bolt 64 has an optical axis section penetrated through the first adjustment hole 63 and a threaded section penetrated through the gasket 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 for threaded connection of the first bolt 64 is provided through the upper end surface of the support block 53. The threaded section of the first bolt 64 is threadedly locked with a first nut 65 that is tightly pressed against the lower end surface of the support block 53. When the first bolt 64 is not completely locked, the positioning block 6 can slide on the adjustment plane 54 along the radial direction of the inner ring 3.

[0038] Reference Figure 4 , Figure 5 The push block 7 is provided with two abutting convex surfaces 75 protruding and fixed on the side wall close to the positioning block 6. The abutting convex surfaces 75 abut against the outer wall of the positioning block 6. The upper end surface of the push block 7 is penetrated with 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 center line of the first adjustment hole 63. The upper end surface of the push block 7 is provided with a second bolt 72 that penetrates 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 penetrates the second adjustment hole 71 and a threaded section that penetrates 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 with 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 is tightly pressed against 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 .

[0039] 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 threadedly penetrated 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 against the outer wall of the positioning block 6. The end face 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 inner hexagonal 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.

[0040] The bottom wall of the stress relief groove of the sink 61 is penetrated by a third adjustment hole 66, which is an arc hole and the axis of the arc hole coincides with the axis of the outer ring 4. The lower end surface of the sink 61 is provided with a third bolt 67 which is penetrated through the third adjustment hole 66 and locked to the outer ring 4. In this embodiment, the third bolt 67 has an optical axis section penetrated through the third adjustment hole 66 and a threaded section penetrated through the support block 53, and the outer diameter of the optical axis section of the third bolt 67 is greater than the outer diameter of the threaded section. The lower end surface of the outer ring 4 is provided with a third threaded hole 43 for the third bolt 67 to be threadedly locked, and the third threaded hole 43 is provided in plurality and distributed along the circumference of the outer ring 4. Both sides of the sink 61 are threadedly connected with circumferential thrust bolts 68, and both side walls of the sink 61 are provided with fourth threaded holes connected to the third adjustment hole 66 for the circumferential thrust bolts 68 to be threadedly connected. 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 .

[0041] The present application also discloses a method for adjusting a fixed circle, including: 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 sinker 61, so that the positioning block 6 is fixed to the outer ring 4, so that the upper plane of the sinker 61 and the side wall of the positioning block 6 are respectively fitted to the bottom face and the outer peripheral face of the outer ring 4, so that the outer ring 4 and the sinker 61 and the positioning block 6 are matched without clearance; 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 sleeved on the inner ring 3, and the outer ring 4 and the inner ring 3 are in a straight line. The ring 3 has a gap, and the first bolt 64 and the second bolt 72 are passed through, and 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 be slid and adjusted along the radial direction of the inner ring 3, and then the height of each positioning block 6 is adjusted by adding a gasket 55 between the lower end surface of each positioning block 6 and the adjustment plane 54, and 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; 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 rotate the radial push screw 73 to adjust the feed amount of the radial push screw 73, and use the advance and retreat of the radial push screws 73 on the two opposite push blocks 7 to push the positioning block 6 and the outer ring 4 to slide and adjust radially. In the continuous radial movement of the six positioning blocks 6, gradually adjust the concentricity of the outer ring 4 relative to the inner ring 3, and test the concentricity with a precision detector to ensure that the concentricity of the outer ring 4 meets the requirements at a certain circumferential position; After the initial concentricity test of the outer ring 4 is carried out 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 push block 7, and the radial push screw 73 is rotated so that the end face of the radial push screw 73 close to the positioning block 6 does not protrude from the side face of the push block 7 close to the positioning block 6, and then the push block 7 is moved so that the abutting convex surface 75 on the push block 7 abuts against the outer wall of the positioning block 6, and 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 abut 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.

[0042] 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, and the two circumferential push bolts 68 are tightened or loosened to cooperate, that is, when one of the circumferential push bolts 68 is screwed in, it abuts and pushes the third bolt 67. At this time, the other circumferential push bolt 68 is loosened and retreated to provide a rotation and sliding space for the third bolt 67. The screwed in circumferential push bolt 68 pushes Push the third bolt 67 to drive the outer ring 4 to move circumferentially relative to the positioning block 6, so as to adjust the circumferential position of the outer ring 4. After the outer ring 4 completes the circumferential position switching, the third bolt 67 is then locked, and the concentricity of the outer ring 4 at this position is tested for the second time. At this time, the flatness and concentricity of the outer ring 4 may change, or may not change, or the change is within the allowable range (the allowable error range is 1-2 wires). 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; The outer ring 4 is subjected to multiple circumferential position switching and multiple detection and adjustment: 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, and the third bolt 67 is locked, and the concentricity is detected for the third time, until the outer ring 4 meets the detection requirements, and the detection and adjustment are repeated multiple times by analogy. After the detection 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 to 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 the position switching of the outer ring 4 during work, greatly improving the weaving work efficiency.

[0043] When testing the flatness and concentricity of the outer ring 4, the precision tester is installed and fixed on the inner ring 3, and 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 run-out value. If the run-out value is within the allowable deviation, it means that the adjustment is successful.

[0044] Embodiment 2: The difference from Example 1 is that, referring to Figure 6 The bottom surface of the outer ring 4 is detachably connected with a pair of protective columns 44 located on both sides of the third bolt 67, and the protective columns 44 are slidably inserted into the third adjustment hole 66. The protective columns 44 are inserted into the outer ring 4 by interference fit or threadedly connected to the outer ring 4. In this embodiment, a fifth threaded hole is provided between two adjacent third threaded holes 43, and the protective columns 44 are threadedly connected to the fifth threaded hole. The protective columns 44 are located between the circumferential thrust bolts 68 and the third bolts 67, and the ends of the circumferential thrust bolts 68 extend into the third adjustment hole 66 and abut against the outer wall of the protective columns 44.

[0045] When the outer ring 4 is rotated and switched in the circumferential position, the third bolt 67 and the outer ring 4 have poor matching strength after the third bolt 67 is loosened. When the circumferential position of the outer ring 4 is adjusted, the circumferential push bolt 68 directly pushes the third bolt 67. The third bolt 67 will tilt when subjected to lateral force and push the outer ring 4 to complete the circumferential movement. At this time, the circumferential push bolt 68 still maintains the push 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 reversely applied to the circumferential The outer ring 4 is moved in the circumferential direction by the push bolts 68, and the circumferential push bolts 68 are 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 fixing 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 bolts 68 push on the protective columns 44 to complete the circumferential movement of the outer ring 4, effectively avoiding direct push action on the third bolts 67, thereby avoiding the tilting of the third bolts 67, and after the outer ring 4 completes the circumferential position adjustment, the third bolts 67 are tightened.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope 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 an even number of support arms (5) are provided and distributed around the axis of the inner ring (3), and 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), and 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 a side of the positioning block (6) away from the inner ring (3), and the positioning block (6) has a sinking platform (61) for abutting against the outer ring (4), and the upper plane of the sinking platform (61) is used for abutting against the lower end surface of the outer ring (4), and the side wall of the positioning block (6) away from the push block (7) is used for abutting against the outer peripheral wall of the outer ring (4), and the upper end surface of the positioning block (6) is provided with a first adjustment hole (63) penetrating therethrough, and the positioning block (6) is provided with a locking plate which is penetrated through the first adjustment hole (63) and is locked. A first bolt (64) is attached to the support arm (5), a second adjustment hole (71) is penetrated through the upper end surface of the push block (7), the push block (7) is provided with a second bolt (72) which is penetrated through the second adjustment hole (71) and 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 both parallel to the radial direction of the inner ring (3), a gasket (55) is padded between the lower end surface of the positioning block (6) and the adjustment plane (54), a third adjustment hole (66) is penetrated through the upper plane of the sinking platform (61), the third adjustment hole (66) is an arc hole and the axis of the arc hole coincides with the axis of the outer ring (4), and the lower end surface of the sinking platform (61) is provided with a third bolt (67) which is penetrated through the third adjustment hole (66) and 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 inserted into 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 threadedly sleeved on one end of the radial thrust 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. A circle fixing mechanism according to claim 1, characterized in that: Circumferential thrust bolts (68) are threadedly connected to both sides of the sink platform (61), and 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).

6. A circle fixing mechanism according to claim 5, characterized in that: A pair of protective columns (44) are detachably connected to the bottom surface of the outer ring (4), and are respectively located on both sides of the third bolt (67). The protective columns (44) are slidably inserted into the third adjustment holes (66). The protective columns (44) are located between the circumferential thrust bolts (68) and the third bolts (67). The ends of the circumferential thrust bolts (68) abut against the outer walls of the protective columns (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. A circle fixing mechanism according to claim 1, characterized in that: The side surface 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 arc surface (62) and the upper plane of the sinker (61) are both formed by grinding, and the arc surface (62) and the upper plane of the sinker (61) are both provided with stress reducing grooves.

9. A weft knitting machine, characterized in that: It comprises the circle fixing mechanism as described in any one of claims 1 to 8, and also 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 surface 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 away from the pushing block (7).

10. A method for adjusting a circle of a circle-fixing mechanism according to any one of claims 1 to 8, characterized in that: include: The flatness of the outer ring (4) is adjusted: first, the third bolt (67) is tightened to fix the positioning block (6) and 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 the outer peripheral surface of the outer ring (4), so that there is no gap between the outer ring (4), the sinking platform (61) and the positioning block (6), and then the positioning block (6) and the push block (7) are placed on the adjustment plane (54) of the support arm (5), so that the outer ring (4) is sleeved on the inner ring (3), and there is a gap between the outer ring (4) and the inner ring (3), and the outer ring (4) and the inner ring (3) are inserted. A first bolt (64) and a second bolt (72) are provided, and an adjustment gap is provided 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 be slidably adjusted along the radial direction of the inner ring (3). Then, a gasket (55) is provided between the lower end surface of the positioning block (6) and the adjustment plane (54), and the flatness of the outer ring (4) is tested by a precision tester, so that the flatness of the outer ring (4) meets the requirements. The concentricity of the outer ring (4) is adjusted by sliding and cooperating two opposing push blocks (7) to achieve a push and a retreat of the positioning block (6) to achieve radial displacement adjustment of the outer ring (4), keeping the push block (7) always in contact with the outer wall of the positioning block (6), and performing an initial concentricity test on the outer ring (4) using a precision tester. After the test meets the requirements, the first bolt (64) and the second bolt (72) are tightened to fix the positioning block (6) and the push block (7), and then the concentricity of the outer ring (4) at different positions is tested: the third bolt (67) is unlocked to release the fixation of the outer ring (4) relative to the positioning block (6). , a force is applied to the outer ring (4) so ​​that the outer ring (4) rotates slightly around its own axis, and the third bolt (67) is locked, thereby performing a second test on the concentricity of the outer ring (4) at that position. When the test deviation is large, it is necessary to adjust the position of each positioning block (6) again until the outer ring (4) meets the test requirements, unlock the third bolt (67) again, rotate the outer ring (4) again, so that the outer ring (4) rotates slightly to the next position, lock 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 requirements, normal weaving work can be started.

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