A circular knitting machine suitable for mixed yarns

Abstract

The application discloses a circular knitting machine suitable for mixed yarns, which comprises a rack, a knitting mechanism and a yarn feeding mechanism; the yarn feeding mechanism comprises a connecting frame and a plurality of yarn feeding units; each yarn feeding unit comprises a fixing block, a cotton combing yarn feeding nozzle and a plurality of cotton yarn feeding nozzles; the connecting frame and the knitting mechanism are arranged on the rack; the fixing blocks are detachably connected to the connecting frame, and a plurality of the fixing blocks are connected end to end to form a ring-shaped fixing seat; the cotton combing yarn feeding nozzle and the plurality of cotton yarn feeding nozzles are detachably installed on the fixing block in sequence. The circular knitting machine suitable for mixed yarns feeds the yarns through the cotton combing yarn feeding nozzle and the cotton yarn feeding nozzle respectively, keeps the structure of the cotton combing yarn stable during feeding, reduces the scattering of the cotton combing yarn, reduces the breaking rate of the cotton combing yarn and improves the production efficiency. Moreover, the number of the yarn feeding nozzles can be flexibly adjusted according to the specific structure of the mixed yarns, the knitting requirements of different types of mixed yarns can be met, and the adaptability and the versatility of the equipment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of textile equipment, and more particularly to a circular knitting machine suitable for mixed yarns. Background Technology

[0002] The circular knitting machine, also known as a circular weft knitting machine, has a large number of loop-forming systems, high speed, high output, fast pattern changes, good fabric quality, fewer processes, and strong product adaptability, and has been widely used.

[0003] In the prior art, thermal fabrics woven from blended yarns have emerged. These fabrics consist of two outer layers and an intermediate layer located between them. Both the outer and intermediate layers are woven from blended yarns, with interlayer yarns connecting the blended yarns. The blended yarns are composed of combed cotton and reinforcing yarns wrapped around the combed cotton. This blended yarn combines the strength of reinforcing yarns with the softness and comfort of combed cotton, significantly improving the fabric's warmth and durability.

[0004] However, in actual production, due to the low viscosity of combed cotton in the blended yarn, when using the existing circular knitting machine's feeding nozzle, the yarn is prone to separation under tension. The resulting stiff yarn, which is difficult to twist, requires the machine to be stopped for adjustment, seriously affecting production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a circular knitting machine suitable for mixed yarns, so as to solve the problem of combed cotton being difficult to wrap around the ribbed yarn during the feeding process of the above-mentioned circular knitting machine.

[0006] To achieve this objective, the present invention adopts the following technical solution: This invention provides a circular knitting machine suitable for mixed yarns, comprising a frame, a knitting mechanism, and a yarn feeding mechanism; The yarn feeding mechanism includes a connecting frame and multiple yarn feeding units; each yarn feeding unit includes a fixed block, a combed cotton yarn feeder, and several cotton yarn feeders; both the connecting frame and the weaving mechanism are mounted on the machine frame; the fixed block is detachably connected to the connecting frame, and multiple fixed blocks are connected end to end to form a ring-shaped fixed seat; the combed cotton yarn feeder and several cotton yarn feeders are sequentially and detachably installed on the fixed block, so that the combed cotton yarn feeder and several cotton yarn feeders are suspended above the weaving mechanism.

[0007] In the circular knitting machine suitable for mixed yarns, the combed cotton feeder includes a cotton guide copper tube and a connecting bracket; one end of the connecting bracket is set on a fixed block, and the middle part of the cotton guide copper tube is detachably connected to the other end of the connecting bracket; the outlet end of the cotton guide copper tube faces the side of the cotton yarn feeder.

[0008] In the circular knitting machine suitable for mixed yarns, the cotton guide copper tube includes an integrally formed inlet section, a fixed section, a curved transition section, and an inclined section; the inlet section, the fixed section, the curved transition section, and the inclined section are connected in sequence, the fixed section is detachably connected to the connecting bracket, the inclined sections between the fixed sections are connected by the curved transition section, and the inclined sections are inclined downwards.

[0009] In the circular knitting machine suitable for mixed yarns, the opening of the inlet section extends outward to form a raised edge, and the raised edge and the inner wall of the inlet section are provided with a transition arc surface.

[0010] In the circular knitting machine suitable for mixed yarns, the cotton yarn feeder includes a first feeder and a second feeder; The first yarn feeder includes a first connecting seat, a first yarn feeder support, a first yarn feeder seat, and a pressing rod; one end of the first connecting seat is detachably connected to a fixing block, the first yarn feeder support is detachably connected to the other end of the first connecting seat, the first yarn feeder seat is disposed at the bottom of the first yarn feeder support, and the pressing rod is disposed at the first yarn feeder seat; the pressing rod is inclined toward the combed cotton yarn feeder side, and the pressing rod is provided with a first thread hole; The second yarn feeder includes a second connecting seat, a second yarn feeder support, and a second yarn feeder seat; one end of the second connecting seat is detachably connected to the fixing block, the second yarn feeder support is detachably connected to the other end of the second connecting seat, the second yarn feeder seat is disposed at the bottom of the second yarn feeder support, and the second yarn feeder seat is provided with a second threading hole; the top of the first yarn feeder support and the second yarn feeder support are provided with yarn guide holes.

[0011] In the circular knitting machine suitable for mixed yarns, the inclination angle of the pressure bar is 25-60°.

[0012] In the circular knitting machine suitable for mixed yarns, the first yarn feeding support and the second yarn feeding support have the same structure, both including a connecting rod and a guide rod. The middle part of the connecting rod is detachably connected to the first connecting seat, one end of the guide rod is connected to the top of the connecting rod, and the yarn guide hole is located near the other end of the guide rod.

[0013] In the circular knitting machine suitable for mixed yarns, the top of the fixed block is provided with a mounting groove, and the bottom of the mounting groove is provided with a plurality of mounting screw holes spaced apart. One end of the first connecting seat / second connecting seat is provided with an avoidance notch adapted to the shape of the mounting groove, and one end of the first connecting seat / second connecting seat is provided with a through hole. The first connecting seat / second connecting seat is connected to the fixed block by a first bolt, and the first bolt passes through the through hole and is threadedly connected to the mounting screw hole.

[0014] In the circular knitting machine suitable for mixed yarns, the inner wall of the fixing block is provided with a slot, the top of the fixing block is provided with a through hole penetrating the top of the slot, the bottom of the slot is provided with a fixing screw hole, the position of the through hole and the fixing screw hole are matched, the outer wall of the connecting frame has an insert protruding outward, the insert is matched with the shape of the slot; the insert is embedded in the slot; the fixing block and the connecting frame are connected by a second bolt, the second bolt passes through the through hole and the insert in sequence and is threadedly connected to the fixing screw hole.

[0015] One of the technical solutions in this invention can have the following beneficial effects: The circular knitting machine for blended yarns described above uses separate feed nozzles for combed cotton and cotton yarn to feed the yarn, maintaining a stable structure for the combed cotton during feeding, reducing the likelihood of the combed cotton spreading out, lowering the breakage rate, and improving production efficiency. Furthermore, the number of feed nozzles can be flexibly adjusted according to the specific structure of the blended yarn, adapting to the knitting needs of different types of blended yarns, significantly improving the equipment's adaptability and versatility. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the weaving mechanism and the yarn feeding mechanism in one embodiment of the present invention; Figure 3 yes Figure 1 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the connection between the yarn feeding mechanism and the frame in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the cotton-guiding copper tube in one embodiment of the present invention; In the attached diagram: 1. Frame; 2. Weaving mechanism; 3. Yarn feeding mechanism; 31. Connecting frame; 32. Fixing block; 33. Combed cotton yarn feeding nozzle; 34. Cotton yarn feeding nozzle; Connecting rod 301, guide rod 302; through hole 303; first bolt 304; second bolt 305; insert block 311; mounting groove 321; mounting screw hole 322; fixing screw hole 323; cotton guide copper tube 331, connecting bracket 332; first connecting seat 341, first yarn feeding support 342, first yarn feeding seat 343, pressure rod 344; first threading hole 345; second connecting seat 346, second yarn feeding support 347, second yarn feeding seat 348; second threading hole 349; yarn guide hole 340; Introduction section 3311, fixed section 3312, curved transition section 3313, inclined section 3314; protruding edge 3315. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0019] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Please refer to Figures 1-5 The present invention provides a circular knitting machine suitable for mixed yarns, including a frame 1, a knitting mechanism 2 and a yarn feeding mechanism 3; The yarn feeding mechanism 3 includes a connecting frame 31 and multiple yarn feeding units; each yarn feeding unit includes a fixing block 32, a combed cotton yarn feeding nozzle 33, and several cotton yarn feeding nozzles 34; the connecting frame 31 and the weaving mechanism 2 are both mounted on the frame 1; the fixing block 32 is detachably connected to the connecting frame 31, and multiple fixing blocks 32 are connected end to end to form a ring-shaped fixing seat; the combed cotton yarn feeding nozzle 33 and several cotton yarn feeding nozzles 34 are sequentially and detachably installed on the fixing block 32, so that the combed cotton yarn feeding nozzle 33 and several cotton yarn feeding nozzles 34 are suspended above the weaving mechanism 2.

[0022] Each yarn feeding unit is independently equipped with a combed cotton feeding nozzle 33 and several cotton yarn feeding nozzles 34, which are responsible for feeding combed cotton and ribbed yarn respectively. Multiple yarn feeding units are connected end to end by a fixing block to form a ring-shaped fixing seat that matches the knitting mechanism, ensuring that the yarn feeding position corresponds precisely to the knitting needle position.

[0023] The combed cotton feeding nozzle 33 is used to feed combed cotton. The nozzle 33 reduces dispersion of the combed cotton before mixing with the reinforcing yarn, keeping the combed cotton in a fine thread shape for easy mixing with the reinforcing yarn. The cotton yarn feeding nozzle 34 is used to feed the reinforcing yarn; the amount of reinforcing yarn fed can be controlled according to the number of cotton yarn feeding nozzles 34 installed.

[0024] The knitting mechanism 2 can refer to the existing knitting mechanism of a circular knitting machine, including structures such as a cylinder, knitting needles, and cams. The knitting mechanism 2 knits the yarn into fabric through the cooperation of the cylinder, knitting needles, and cams.

[0025] The circular knitting machine for blended yarns described above uses separate feeding nozzles 33 for combed cotton and 34 for cotton yarn, ensuring a stable structure for the combed cotton during feeding, reducing the likelihood of the combed cotton scattering, lowering the breakage rate, and improving production efficiency. Furthermore, the number of feeding nozzles can be flexibly adjusted according to the specific structure of the blended yarn, adapting to the knitting needs of different types of blended yarns, significantly improving the equipment's adaptability and versatility.

[0026] Specifically, the combed cotton feeding nozzle 33 includes a cotton guiding copper tube 331 and a connecting bracket 332; one end of the connecting bracket 332 is disposed on the fixing block 32, and the middle part of the cotton guiding copper tube 331 is detachably connected to the other end of the connecting bracket 332; the outlet end of the cotton guiding copper tube 331 faces the side of the cotton yarn feeding nozzle 34.

[0027] The combed cotton is introduced through the guide copper tube 331, with the outlet end of the guide copper tube 331 facing the side of the yarn feed nozzle 34, so that the combed cotton directly enters the wrapping area after exiting the guide copper tube 331. Copper has excellent thermal conductivity and a low coefficient of friction, allowing the combed cotton to be smoothly transported inside the guide copper tube 331, avoiding tension fluctuations caused by friction with external contact surfaces during transport. Moreover, it keeps the combed cotton in a stable position, ensuring constant yarn tension.

[0028] The connecting bracket 332 is used to fix the cotton-guiding copper tube 331 to the fixing block 32. The connecting bracket 332 includes a connecting rod and a copper tube clamp. One end of the connecting rod is connected to the fixing block 32, and the other end is connected to the copper tube clamp. The copper tube clamp is threaded with bolts, which are tightened against the cotton-guiding copper tube 331 to achieve a detachable connection of the cotton-guiding copper tube 331. With the above structure, it is convenient for personnel to adjust the position of the cotton-guiding copper tube 331 according to the actual situation, so that the combed cotton can evenly wrap the rib yarn from the optimal angle.

[0029] Specifically, the guide copper tube 331 includes an integrally formed inlet section 3311, a fixing section 3312, a bending transition section 3313, and an inclined section 3314; the inlet section 3311, the fixing section 3312, the bending transition section 3313, and the inclined section 3314 are connected in sequence; the fixing section 3312 is detachably connected to the connecting bracket 332; the inclined sections 3314 of the fixing sections 3312 are connected through the bending transition section 3313; and the inclined sections 3314 are inclined downward.

[0030] The smooth, curved transition section 3313 maintains stable tension in the combed cotton during the turning process, preventing yarn stretching, twisting, or dispersion caused by abrupt turning. The inclined section 3314 is set downwards, allowing the combed cotton to hang naturally after being output from the cotton guide tube 331, facilitating mixing with the reinforcing yarn.

[0031] Preferably, the opening of the inlet section 3311 extends outward to form a convex edge 3315, and the convex edge 3315 and the inner wall of the inlet section 3311 are provided with a transition arc surface.

[0032] With the above structure, the inlet of the inlet section 3311 is in the shape of a gentle trumpet, which guides the yarn to enter the cotton guide copper tube 331 smoothly, reducing the friction between the combed cotton and the edge of the inlet, avoiding wear between the combed cotton and the opening of the inlet section 3311, and preventing damage to the combed cotton.

[0033] Furthermore, the yarn feeding nozzle 34 includes a first yarn feeding nozzle and a second yarn feeding nozzle; The first yarn feeder includes a first connecting seat 341, a first yarn feeder support 342, a first yarn feeder seat 343, and a pressing rod 344; one end of the first connecting seat 341 is detachably connected to the fixing block 32, the first yarn feeder support 342 is detachably connected to the other end of the first connecting seat 341, the first yarn feeder seat 343 is disposed at the bottom of the first yarn feeder support 342, and the pressing rod 344 is disposed on the first yarn feeder seat 343; the pressing rod 344 is inclined toward the combed cotton yarn feeder 33, and the pressing rod 344 is provided with a first thread hole 345; The second yarn feeder includes a second connecting seat 346, a second yarn feeder support 347, and a second yarn feeder seat 348; one end of the second connecting seat 346 is detachably connected to the fixing block 32, the second yarn feeder support 347 is detachably connected to the other end of the second connecting seat 346, the second yarn feeder seat 348 is disposed at the bottom of the second yarn feeder support 347, and the second yarn feeder seat 348 is provided with a second threading hole 349; the top of the first yarn feeder support 342 and the second yarn feeder support 347 are provided with yarn guide holes 340.

[0034] By adopting the above structure, the first and second yarn feeding nozzles are set to introduce the reinforcing yarn from different angles, which facilitates the combed cotton to cover the reinforcing yarn and avoids the problem of uneven coverage caused by wrapping from a single angle.

[0035] In one specific embodiment of the present invention, two reinforcing yarns are introduced. One reinforcing yarn is inserted through the yarn guide hole 340 of the first yarn feeding support 342, then through the first threading hole 345, and is woven by the braiding mechanism 2. The other reinforcing yarn is inserted through the yarn guide hole 340 of the second yarn feeding support 347, then through the second threading hole 349, and is woven by the braiding mechanism 2.

[0036] Furthermore, the tilt angle of the pressure bar 344 is 25 to 60°.

[0037] By adopting the above structure, the contact area between the combed cotton and the reinforcing yarn is increased, and the tightness of the wrapping is improved; the component force generated by the tilt angle makes the combed cotton adhere tightly to the surface of the reinforcing yarn, preventing slippage.

[0038] Specifically, the first yarn feeding support 342 and the second yarn feeding support 347 have the same structure, both including a connecting rod 301 and a guide rod 302. The middle part of the connecting rod 301 is detachably connected to the first connecting seat 341. One end of the guide rod 302 is connected to the top of the connecting rod 301. The yarn guide hole 340 is located near the other end of the guide rod 302.

[0039] With the above structure, the cross-sections of the first yarn feeding support 342 and the second yarn feeding support 347 are shaped like the number 7, forming a stable support structure that provides reliable support for the guide rod 302, preventing it from swaying or shifting during high-speed operation. The middle part of the connecting rod 301 is detachably connected to the first connecting seat 341. By replacing the connecting rod 301, the height of the guide rod can be adjusted, thereby adjusting the entry angle of the reinforcing yarn.

[0040] Specifically, the top of the fixing block 32 is provided with a mounting groove 321, and the bottom of the mounting groove 321 is provided with a plurality of mounting screw holes 322 at intervals. One end of the first connecting seat 341 / second connecting seat 346 is provided with an avoidance notch that matches the shape of the mounting groove 321, and one end of the first connecting seat 341 / second connecting seat 346 is provided with a through hole 303. The first connecting seat 341 / second connecting seat 346 is connected to the fixing block 32 by a first bolt 304. The first bolt 304 passes through the through hole 303 and is threadedly connected to the mounting screw holes 322.

[0041] Using the above structure, precise positioning and rapid installation can be achieved by cooperating with the mounting groove 321 and the clearance notch; moreover, the bottom of the mounting groove 321 is provided with multiple mounting screw holes at intervals. By selecting different mounting screw holes to align with and tighten the through holes 303 of the first connecting seat 341 / second connecting seat 346, the position of the first connecting seat 341 / second connecting seat 346 on the fixing block 32 can be flexibly adjusted, and multiple cotton yarn feeding nozzles 34 can also be installed.

[0042] The first connecting seat 341 / second connecting seat 346 and the fixing block 32 are detachably connected by the first bolt 304 to prevent the first connecting seat 341 / second connecting seat 346 and the fixing block 32 from loosening or falling off during operation.

[0043] Specifically, the inner sidewall of the fixing block 32 is provided with a slot, the top of the fixing block 32 is provided with a through hole penetrating the top of the slot, the bottom of the slot is provided with a fixing screw hole 323, the through hole and the fixing screw hole 323 are matched in position, the outer sidewall of the connecting frame 31 has an insert 311 protruding outward, the insert 311 is matched in shape with the slot; the insert 311 is embedded in the slot; the fixing block 32 and the connecting frame 31 are connected by a second bolt 305, the second bolt 305 passes through the through hole and the insert 311 in sequence and is threadedly connected to the fixing screw hole 323.

[0044] The nested structure of the insert 311 embedded in the slot enables the positioning and guidance between the fixing block 32 and the connecting frame 31; and the second bolt 305 is used for fastening to achieve a detachable connection, which is convenient for replacement and maintenance.

[0045] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A circular knitting machine suitable for mixed yarns, characterized in that, Includes the frame, weaving mechanism, and yarn feeding mechanism; The yarn feeding mechanism includes a connecting frame and multiple yarn feeding units; each yarn feeding unit includes a fixed block, a combed cotton yarn feeder, and several cotton yarn feeders; both the connecting frame and the weaving mechanism are mounted on the machine frame; the fixed block is detachably connected to the connecting frame, and multiple fixed blocks are connected end to end to form a ring-shaped fixed seat; the combed cotton yarn feeder and several cotton yarn feeders are sequentially and detachably installed on the fixed block, so that the combed cotton yarn feeder and several cotton yarn feeders are suspended above the weaving mechanism.

2. The circular knitting machine for mixed yarns according to claim 1, characterized in that, The combed cotton yarn feeder includes a cotton guide copper tube and a connecting bracket; one end of the connecting bracket is set on a fixed block, and the middle part of the cotton guide copper tube is detachably connected to the other end of the connecting bracket; the outlet end of the cotton guide copper tube faces the side of the cotton yarn feeder.

3. A circular knitting machine suitable for mixed yarns according to claim 2, characterized in that, The cotton guide copper tube includes an integrally formed inlet section, a fixed section, a bending transition section, and an inclined section; the inlet section, the fixed section, the bending transition section, and the inclined section are connected in sequence; the fixed section is detachably connected to the connecting bracket; the inclined sections of the fixed sections are connected by the bending transition section; and the inclined sections are inclined downwards.

4. A circular knitting machine suitable for mixed yarns according to claim 3, characterized in that, The opening of the inlet section extends outward to form a convex edge, and the convex edge and the inner wall of the inlet section are provided with a transition arc surface.

5. A circular knitting machine suitable for mixed yarns according to claim 1, characterized in that, The cotton yarn feeding nozzle includes a first feeding nozzle and a second feeding nozzle; The first yarn feeder includes a first connecting seat, a first yarn feeder support, a first yarn feeder seat, and a pressing rod; one end of the first connecting seat is detachably connected to a fixing block, the first yarn feeder support is detachably connected to the other end of the first connecting seat, the first yarn feeder seat is disposed at the bottom of the first yarn feeder support, and the pressing rod is disposed at the first yarn feeder seat; the pressing rod is inclined toward the combed cotton yarn feeder side, and the pressing rod is provided with a first thread hole; The second yarn feeder includes a second connecting seat, a second yarn feeder support, and a second yarn feeder seat; one end of the second connecting seat is detachably connected to the fixing block, the second yarn feeder support is detachably connected to the other end of the second connecting seat, the second yarn feeder seat is disposed at the bottom of the second yarn feeder support, and the second yarn feeder seat is provided with a second threading hole; the top of the first yarn feeder support and the second yarn feeder support are provided with yarn guide holes.

6. A circular knitting machine suitable for mixed yarns according to claim 5, characterized in that, The inclination angle of the pressure bar is 25 to 60°.

7. A circular knitting machine suitable for mixed yarns according to claim 5, characterized in that, The first and second yarn feeding supports have the same structure, both including a connecting rod and a guide rod. The middle part of the connecting rod is detachably connected to the first connecting seat, one end of the guide rod is connected to the top of the connecting rod, and the yarn guide hole is located near the other end of the guide rod.

8. A circular knitting machine suitable for mixed yarns according to claim 5, characterized in that, The top of the fixing block is provided with a mounting groove, and the bottom of the mounting groove is provided with a plurality of mounting screw holes spaced apart. One end of the first connecting seat / second connecting seat is provided with an avoidance notch adapted to the shape of the mounting groove, and one end of the first connecting seat / second connecting seat is provided with a through hole. The first connecting seat / second connecting seat is connected to the fixing block by a first bolt, which passes through the through hole and is threadedly connected to the mounting screw hole.

9. A circular knitting machine suitable for mixed yarns according to claim 1, characterized in that, The inner wall of the fixing block is provided with a slot, the top of the fixing block is provided with a through hole penetrating the top of the slot, the bottom of the slot is provided with a fixing screw hole, the through hole and the fixing screw hole are matched in position, the outer wall of the connecting frame has an insert protruding outward, the insert is matched in shape with the slot; the insert is embedded in the slot; the fixing block and the connecting frame are connected by a second bolt, the second bolt passes through the through hole and the insert in sequence and is threadedly connected to the fixing screw hole.

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