A circular loom

Abstract

The present invention discloses a circular loom, belonging to the field of plastic weaving machinery, which solves the problem that the weak rigidity of the top ring causes the upper roller to bounce up and down. The technical solution to solve this problem is mainly that the bottom of the frame is fixedly connected to the chassis, the middle ring is fixedly connected to the middle part of the frame, the top of the frame is fixedly connected to the top ring, the lower door ring is fixedly connected to the middle ring, the upper door ring is fixedly connected to the top of the top ring or the frame. The top ring includes a first ring body extending radially and a second ring body extending axially. The top end of the second ring body is integrally connected to the inner ring of the first ring body. The axial thickness of the first ring body is B1, B1≥15mm, and the height distance from the bottom end of the second ring body to the bottom surface of the first ring body is H, H = 20mm - 80mm. The upper roller is hoisted on the first ring body. The present invention is mainly used for the production of plastic woven bags, improves the structural strength of the top ring, makes the upper roller not easy to bounce up and down, and ensures that the warp tape can be tensioned.

Description

Technical Field

[0001] The invention relates to a plastic weaving machine, in particular to a circular weaving machine. Background Art

[0002] The existing circular loom includes a warp frame, a main machine and a winding machine. The main machine is the main component for completing the plastic flat wire cylindrical weaving, which includes a gate ring assembly and a top ring. The top ring is fixed above the gate ring assembly. The warp is transported from the outside to the inside into the gate ring assembly. The gate ring assembly is provided with a runway for the shuttle to move in a circle. The shuttle is equipped with a weft and during the circular motion, the weft is continuously unwound and passes through the warp at intervals up and down to complete the cross interweaving of the warp and the weft. In order to allow the adjacent warp to form an up-and-down relationship to allow the weft to pass through, the adjacent healds need to move up and down to achieve this, and the up and down movement of the healds is driven by a swing rod, and the swing rod is driven by a cam installed on the main shaft of the main machine. In order to ensure the smooth up and down movement of the heald, an upper roller for positioning the heald belt is set on the top ring, and the heald belt is connected to the heald. For details, please refer to the prior art CN219032507U.

[0003] Since the circular loom will generate large vibrations during operation, especially when the shuttle moves in a circle on the gate ring assembly, and the top ring and the upper gate ring are fixedly connected, the vibrations generated by the movement of the shuttle can be easily transmitted to the top ring, so the rigidity requirements of the top ring are relatively high. For example, the top ring disclosed in CN219032507U adopts a planar ring structure, which has relatively weak rigidity in the axial direction, and the upper roller will have obvious up and down jumping, resulting in the heald belt not being tensioned by the upper roller, affecting the cross-interweaving of the warp yarns, and causing problems with the weaving quality. For example, in CN201534907U, a boss is set on the top ring (upper ring 1) to install the upper roller. Since the bosses are scattered on the circumference of the top ring, there is no connection between adjacent bosses, resulting in a weaker structural strength of the bosses, and the upper roller is more likely to jump up and down. Summary of the invention

[0004] The purpose of the present invention is to provide a circular loom to solve the problem that the upper roller jumps up and down due to the weak rigidity of the top ring, improve the structural strength of the top ring, prevent the upper roller from jumping up and down, and ensure that the heald belt can be tensioned.

[0005] To achieve the above object, the present invention adopts the following technical solution: A circular loom, comprising a frame, a chassis, a main shaft, a cam, a swing rod, a heddle tape assembly, a housing, a middle ring, a top ring, a lower door ring and an upper door ring. The chassis is fixed to the frame, the main shaft is axially positioned on the chassis, the cam is installed and fixed on the main shaft. The heddle tape assembly includes an upper heddle tape, a lower heddle tape, outer heddle wires and inner heddle wires. The upper heddle tape is wrapped around the upper roller, the lower heddle tape is wrapped around the lower roller, the lower roller is installed on the chassis. The upper end of the outer heddle wire is connected to the outer end of the upper heddle tape, and the lower end is connected to the outer end of the lower heddle tape. The upper end of the inner heddle wire is connected to the inner end of the upper heddle tape, and the lower end is connected to the inner end of the lower heddle tape. The middle part of the swing rod is hinged to the chassis, the inner end of the swing rod is connected to the cam and moves along the working surface of the cam, and the outer end of the swing rod is connected to the lower heddle tape. The bottom of the housing is fixedly connected to the chassis, the middle ring is fixedly connected to the middle part of the housing, the top of the housing is fixedly connected to the top ring, the lower door ring is fixedly connected to the middle ring, the upper door ring is fixedly connected to the top ring or the top of the housing. The top ring includes a first ring body extending radially and a second ring body extending axially. The top end of the second ring body is integrally connected to the inner ring of the first ring body. The axial thickness of the first ring body is B1, B1≥15mm, and the height distance from the bottom end of the second ring body to the bottom surface of the first ring body is H, H = 20mm - 80mm. A plurality of upper rollers for installing heddle tapes are suspended on the first ring body.

[0006] After adopting the above technical solution, the present invention has the following advantages: First, on the basis that the top of the housing is fixedly connected to the top ring, by fixedly connecting the upper door ring to the top ring or the top of the housing, the housing, the top ring and the upper door ring are fixed to form an integral body, so that the vibration generated by the movement of the shuttle can also be transmitted to the housing, and the bottom of the housing is fixedly connected to the chassis. Therefore, part of the vibration can be transmitted to the chassis again, and during the long-distance transmission process, part of the vibration energy is consumed. Second, the top ring is designed to include a first ring body extending radially and a second ring body extending axially. The top end of the second ring body is integrally connected to the inner ring of the first ring body. Then, by selecting appropriate sizes for B1 and H, a higher structural strength is obtained by using the large size of the second ring body in the axial direction. The circular ring structure of the second ring body can evenly disperse the vibration, making the inner ring of the first ring body not easily deformed. Then, by using the thickness B1 of the first ring body itself, a higher structural strength is obtained in the radial direction, so as to ensure that the outer ring of the first ring body is not easily deformed. At this time, by suspending the upper roller on the first ring body, the stability of the upper roller can be ensured, and it is not easy to jump up and down, ensuring that the heddle tape is tensioned by the upper roller, which is beneficial to ensuring the weaving quality.

[0007] Further, the radial thickness of the second ring body is B2, 8mm≤B2≤16mm and B2≤B1.

[0008] Further, the upper roller is installed on the upper bracket, the radius of the upper roller is R1, the upper bracket is connected to the first ring body through a connecting member, the first ring body is provided with an installation through hole for the connecting member to pass through, and the distance from the center of the installation through hole to the outer peripheral side surface of the first ring body is L1, where R1 < L1 ≤ 25 mm.

[0009] Further, the radial distance from the upper bracket to the second ring body is L2, where 1 mm ≤ L2 ≤ 5 mm.

[0010] Further, the top surface of the frame is in contact with the bottom surface of the first ring body, and the inner side surface of the frame is in contact with the outer side surface of the second ring body.

[0011] Further, the upper door ring is fixedly connected to the top ring or the top of the frame through a support rod. The support rod includes an upper connecting portion and at least two lower connecting portions. The upper connecting portion is fixedly connected to the top ring or the frame. The upper end of the lower connecting portion is connected to the lower end of the upper connecting portion, and the lower end of the lower connecting portion is fixedly connected to the upper door ring. The number of support rods does not exceed 10.

[0012] Further, there are two lower connecting portions, which extend towards both sides relative to the upper connecting portion to form a Λ-shaped structure.

[0013] Further, the lower end of the lower connecting portion is closer to the center of the upper door ring than the upper end of the lower connecting portion.

[0014] Further, a connecting foot is provided at the bottom end of the lower connecting portion. The connecting foot extends from the outside to the inside relative to the upper door ring, and the lower connecting portion is fixedly connected to the upper door ring through the connecting foot.

[0015] Further, the upper connecting portion is fixedly connected to the second ring body; or, the upper connecting portion is fixedly connected to the inner side surface of the frame, and the number of support rods is equal to the number of frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Figure 1 is a schematic diagram of a circular loom according to the present invention;

[0018] Figure 2 is Figure 1 an enlarged view (I) of part A in

[0019] Figure 3 is Figure 1 an enlarged view (II) of part A in

[0020] Figure 4 is a schematic diagram of the connection between the support rod and the second ring body in the present invention;

[0021] Figure 5Schematic diagram of the connection between the top ring and the upper door ring in the present invention through a support rod. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention.

[0023] The terms "first", "second", etc. (if any) in the description and claims of the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used before a certain technical feature to distinguish, it does not necessarily imply the existence of "first". It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. It should be understood that in the present invention, "a plurality of" means two or more. "And / or" is merely a description of the relationship between associated objects, indicating that three relationships may exist. For example, X and / or Y may represent: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Including X, Y, and Z", "including X, Y, Z" means that X, Y, and Z are all included, "including X, Y, or Z" means including any one of X, Y, and Z, and "including X, Y, and / or Z" means including any one or any two or three of X, Y, and Z.

[0024] The technical solutions of the present invention will be described in detail below with specific embodiments. These specific embodiments can be combined or replaced according to the actual situation, and the same or similar concepts or processes may not be repeated in some embodiments.

[0025] The present invention provides a circular loom, as Figure 1As shown in the figure, it includes a frame 100, a chassis 101, a main shaft 102, a cam 103, a swing rod 104, a heald tape assembly, a housing 200, a middle ring 300, a top ring 400, a lower door ring 500 and an upper door ring 600. The chassis 101 is fixed on the frame 100. The main shaft 102 is axially positioned on the chassis 101. The cam 103 is installed and fixed on the main shaft 102. The heald tape assembly includes an upper heald tape 701, a lower heald tape 702, outer heald wires 703 and inner heald wires 704. The upper heald tape 701 is wrapped around an upper roller 705. The lower heald tape 702 is wrapped around a lower roller 706. The lower roller 706 is installed on the chassis 101. The upper end of the outer heald wire 703 is connected to the outer end of the upper heald tape 701, and the lower end is connected to the outer end of the lower heald tape 702. The upper end of the inner heald wire 704 is connected to the inner end of the upper heald tape 701, and the lower end is connected to the inner end of the lower heald tape 702. The middle part of the swing rod 104 is hinged to the chassis 101. The inner end of the swing rod 104 is connected to the cam 103 and moves along the working surface of the cam 103. The outer end of the swing rod 104 is connected to the lower heald tape 702. The main shaft 102 drives the cam 103 to rotate under the drive of a motor. The working surface on the outer periphery of the cam 103 is wavy. The inner end of the swing rod 104 moves on the working surface and moves up and down along with the working surface, so that the outer end of the swing rod 104 swings, further driving the lower heald tape 702 to move up and down reciprocally, enabling the outer heald wires 703 and the inner heald wires 704 to achieve a staggered up and down reciprocating movement, that is, when the outer heald wires 703 move upward, the inner heald wires 704 move downward, and when the outer heald wires 703 move downward, the inner heald wires 704 move upward. The outer heald wires 703 and the inner heald wires 704 are radially staggered from each other. The warp threads pass through the heald eyes of the outer heald wires 703 and the inner heald wires 704 one by one, that is, one warp thread passes through the heald eye of the outer heald wire 703, and the next warp thread passes through the heald eye of the inner heald wire 704, alternately at intervals. Through the staggered up and down reciprocating movement of the outer heald wires 703 and the inner heald wires 704, the adjacent two warp threads are opened up and down. Then, the shuttle brings the weft thread to pass through the opened warp threads, and cross knitting can be achieved.

[0026] The bottom of the housing 200 is fixedly connected to the chassis 101. The middle ring 300 is fixedly connected to the middle part of the housing 200. The top of the housing 200 is fixedly connected to the top ring 400. The lower door ring 500 is fixedly connected to the middle ring 300. The upper door ring 600 is fixedly connected to the top ring 400 or the top of the housing 200. In combination Figure 2 Look, the top ring 400 includes a first ring body 401 extending radially and a second ring body 402 extending axially. The top end of the second ring body 402 is integrally connected to the inner ring of the first ring body 401. The axial thickness of the first ring body 401 is B1, B1≥15mm, for example, B1 = 20mm or 25mm, etc. The height distance from the bottom end of the second ring body 402 to the bottom surface of the first ring body 401 is H, H = 20mm - 80mm, for example, H = 30mm or 35mm, etc. The upper roller 705 is hoisted on the first ring body 401.

[0027] The present invention firstly has the top of the archway 200 fixedly connected to the foundation of the top ring 400, and the upper door ring 600 is fixedly connected to the top ring 400 or the top of the archway 200, so that the archway 200, the top ring 400 and the upper door ring 600 are fixed to form a whole, so that the vibration generated by the shuttle movement of the upper door ring 600 can also be transmitted to the archway 200, and the bottom of the archway 200 is fixedly connected to the chassis 101, so that part of the vibration can be transmitted to the chassis 101, and part of the vibration energy is consumed in the long-distance transmission process; secondly, the top ring 400 is designed to include a radially extending first ring body 401 and an axially extending second ring body 402, and the top of the second ring body 402 It is connected to the inner ring of the first ring body 401 as a whole, and then the appropriate size of B1 and H is selected. The large size of the second ring body 402 in the axial direction is used to obtain a higher structural strength. The circular ring structure of the second ring body 402 can evenly disperse the vibration, so that the inner ring of the first ring body 401 is not easy to deform. Then the thickness B1 of the first ring body 401 itself is used to obtain a higher structural strength in the radial direction, thereby ensuring that the outer ring of the first ring body 401 is not easy to deform. At this time, the upper roller 705 is hoisted on the first ring body 401 to ensure the stability of the upper roller 705, and it is not easy to jump up and down, ensuring that the heddle 700 is tensioned by the upper roller 705, which is conducive to ensuring the weaving quality. Considering the cost, B1 should not be too large, generally not more than 30mm.

[0028] The radial thickness of the second ring body 402 is B2. In order to make the second ring body 402 have sufficient strength in the radial direction and reduce the influence of the centrifugal force generated by the circular motion of the shuttle on the upper roller 705, 8mm≤B2≤16mm can be reasonably selected, for example, B2=12mm, etc. At the same time, after obtaining sufficient strength, in order to save material consumption and reduce the weight of the top ring, B2≤B1 can be selected at the same time.

[0029] Specific references Figure 3 , the upper roller 705 is installed on the upper bracket 7051, the radius of the upper roller 705 is R1, the upper bracket 7051 is connected to the first ring body 401 through the connecting piece 7052, the first ring body 401 is provided with a mounting hole 403 for the connecting piece 7052 to pass through, the distance from the center of the mounting hole 403 to the outer peripheral side of the first ring body 401 is L1, R1<L1≤25mm. First, L1 should be greater than R1, which can reduce the probability of dust falling on the upper roller 705 when it is reduced by gravity. Secondly, L1 does not exceed 25mm, for example, L1=16mm, etc., to ensure that the upper roller 705 will not be far away from the second ring body 402, and the upper roller 705 is hoisted at a position with higher structural stability of the first ring body 401. The specific installation scheme of the upper roller 705 can refer to the prior art CN219032507U, which will not be expanded here.

[0030] The radial distance from the upper support 7051 to the second ring body 402 is L2. Since the strength of the first ring body 401 gradually increases from the outside to the inside, the closer the position where the upper roller 705 hoists is to the second ring body 402, the better the seismic effect. Therefore, 1mm ≤ L2 ≤ 5mm can be selected, for example, L2 = 3mm, etc.

[0031] In order to enable the top ring 400 to obtain a better supporting effect from the frame 200, the top surface of the frame 200 can be made to abut against the bottom surface of the first ring body 401, and the inner side surface of the frame 200 can be made to abut against the outer side surface of the second ring body 402. The frame 200 can withstand axial and radial vibrations.

[0032] In the prior art, since the top ring 400 is formed by machining steel, it is heavy. In order to fix the top ring 400 above the upper door ring 600, a support rod 800 is used to fixedly connect the upper door ring 600 and the top ring 400. Specifically, the support rod 800 is connected between the top ring 400 and the upper door ring 600. The number of support rods 800 is relatively large, generally 12 to 16. Since the top of the support rod 800 needs to be drilled and processed on the top ring 400, in order to ensure uniform force on the support rod 800, the accuracy requirements for the drilling and processing position on the top ring 400 are relatively high, which not only increases the production cost, but also makes the installation time-consuming due to the large number.

[0033] Combined Figure 4 and Figure 5 seen, therefore, in order to reduce the number of support rods 800 used, the support rod 800 includes an upper connection part 801 and at least two lower connection parts 802. The upper connection part 801 is fixedly connected to the top ring 400. The upper end of the lower connection part 802 is connected to the lower end of the upper connection part 801, and the lower end of the lower connection part 802 is fixedly connected to the upper door ring 600. The number of support rods 800 does not exceed 10. The support rod 800 is designed to have a structure including at least two lower connection parts 802. Each support rod 800 has at least two lower connection parts 802 fixedly connected to the upper door ring 600, which is equivalent to providing at least two force application points. Therefore, all support rods 800 can provide at least twice the number of force application points as the number of support rods 800, making the vibrations generated by the shuttle movement more evenly distributed to the support rods 800. Thus, the fixed connection between the top ring 400 and the upper door ring 600 can be achieved when the number of support rods 800 does not exceed 10, improving the structural stability of the upper door ring 600, facilitating the smooth movement of the shuttle, effectively reducing the number of support rods 800, reducing the production cost, and improving the assembly efficiency.

[0034] In one embodiment, there are two lower connecting parts 802, which extend toward both sides relative to the upper connecting part 801 to form a Λ-shaped structure. After the two lower connecting parts 802 are fixedly connected to the upper door ring 600, a triangular structure is formed, and the structural stability is better. It can be understood that when the structural strength is satisfied, the two lower connecting parts 802 can form other common shapes such as a ∩-shaped structure or a Π-shaped structure.

[0035] Since the circular loom generates large vibrations during operation, on the premise of reducing the number of support rods 800, to further improve the connection stability of the support rods 800 to the top ring 400 and the upper door ring 600, it can be designed that the lower end of the lower connecting part 802 is closer to the center of the upper door ring 600 than the upper end of the lower connecting part 802. All the support rods 800 can form an annular diagonal tension effect, canceling out the vibrations generated during the operation of the circular loom, thereby reducing the vibration influence and improving the structural stability of the top ring 400 and the upper door ring 600.

[0036] To facilitate the installation and connection of the lower connecting part 802 to the upper door ring 600, a connecting foot 803 can be provided at the bottom end of the lower connecting part 802. The lower connecting part 802 is fixedly connected to the upper door ring 600 through the connecting foot 803. The connecting foot 803 extends from the outside to the inside relative to the upper door ring 600, which can make the connecting foot 803 in a visible state for workers to stand. There is no need to adopt ways such as bending over or squatting to change the body posture for installation, which is more labor-saving and is beneficial to further improving the assembly efficiency.

[0037] In one embodiment, the support rods 800 can be provided with 6 or 8. In a smaller circular loom, a scheme with a smaller number such as only 5 or 4 support rods 800 can be selected, and generally it will not be less than 3. It can be understood that to improve the support stability, the number of support rods 800 can also be set to 7, 8, 9, 10, etc. For example Figure 5 is provided with 8 support rods 800.

[0038] To enable the support rods 800 to evenly distribute the force, it can be selected that the support rods 800 are evenly distributed in the circumferential direction of the top ring 400.

[0039] In the above embodiment, only one upper connecting part 801 is provided, so the number of holes to be drilled on the top ring 400 is greatly reduced, and the assembly efficiency is very high. In some cases, setting two upper connecting parts 801, and the support rods 800 are in an X shape or an H shape, etc., can also improve the assembly efficiency, but the effect is not obvious enough. Therefore, it is not recommended to increase the number of upper connecting parts 801 too much. To increase the support effect of the support rods 800, more lower connecting parts 802 can be set. Similarly, after the number of lower connecting parts 802 increases, the effect on improving the assembly efficiency will gradually decline. Therefore, it is not recommended to increase the number of lower connecting parts 802 too much.

[0040] Specifically, the upper connecting portion 801 can be fixedly connected to the second ring body 402, for example, the inner side surface of the second ring body 402. Refer to Figure 4 , which is convenient for workers to observe and assemble. Of course, it can also be connected to the outer side surface of the second ring body 402. Refer to Figure 5 . The solution that the upper connecting portion 801 is fixedly connected to the first ring body 401 is not excluded either.

[0041] In another embodiment, the upper connecting portion 801 can be fixedly connected to the inner side surface of the frame 200. For example, Figure 2 and Figure 3 as shown, the vibration of the upper door ring is directly transmitted to the frame 200 by using the support rod 800, reducing the influence on the top ring 400. The number of support rods 800 is equal to the number of frames 200. For example, in a four-shuttle or eight-shuttle circular loom, the number of frames 200 is generally 8, and in a six-shuttle circular loom, the number of frames 200 is generally 6.

[0042] In addition to the above preferred embodiments, the present invention has other implementation manners. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope claimed by the present invention.

Claims

1. A circular loom, comprising a frame, a chassis, a main shaft, a cam, a swing rod, a heald tape assembly, a housing, a middle ring, a top ring, a lower door ring and an upper door ring. The chassis is fixed on the frame, the main shaft is axially positioned on the chassis, the cam is installed and fixed on the main shaft. The heald tape assembly includes an upper heald tape, a lower heald tape, outer heald wires and inner heald wires. The upper heald tape is wrapped around an upper roller, the lower heald tape is wrapped around a lower roller, the lower roller is installed on the chassis. The upper end of the outer heald wire is connected to the outer end of the upper heald tape, and the lower end is connected to the outer end of the lower heald tape. The upper end of the inner heald wire is connected to the inner end of the upper heald tape, and the lower end is connected to the inner end of the lower heald tape. The middle part of the swing rod is hinged to the chassis, the inner end of the swing rod is connected to the cam and moves along the working surface of the cam, the outer end of the swing rod is connected to the lower heald tape. The bottom of the housing is fixedly connected to the chassis, the middle ring is fixedly connected to the middle part of the housing, the top of the housing is fixedly connected to the top ring, the lower door ring is fixedly connected to the middle ring, the upper door ring is fixedly connected to the top ring or the top of the housing, and it is characterized in that, The top ring includes a first annular body extending radially and a second annular body extending axially. The top end of the second annular body is integrally connected to the inner ring of the first annular body. The axial thickness of the first annular body is B1, where B1 ≥ 15 mm. The height distance from the bottom end of the second annular body to the bottom surface of the first annular body is H, where H = 20 mm to 80 mm. The upper roller is hoisted on the first annular body. The upper door ring is fixedly connected to the top of the top ring or the portal through a support rod. The support rod includes an upper connecting portion and at least two lower connecting portions. The upper connecting portion is fixedly connected to the top ring or the portal. The upper end of the lower connecting portion is connected to the lower end of the upper connecting portion, and the lower end of the lower connecting portion is fixedly connected to the upper door ring. The lower end of the lower connecting portion is closer to the center of the upper door ring than the upper end of the lower connecting portion.

2. The circular loom according to claim 1, characterized in that, The radial thickness of the second annular body is B2, where 8 mm ≤ B2 ≤ 16 mm and B2 ≤ B1.

3. The circular loom according to claim 1, characterized in that, The upper roller is installed on an upper bracket. The radius of the upper roller is R1. The upper bracket is connected to the first annular body through a connecting member. The first annular body is provided with an installation through-hole for the connecting member to pass through. The distance from the center of the installation through-hole to the outer peripheral side surface of the first annular body is L1, where R1 < L1 ≤ 25 mm.

4. The circular loom according to claim 3, characterized in that, The radial distance from the upper bracket to the second annular body is L2, where 1 mm ≤ L2 ≤ 5 mm.

5. The circular loom according to claim 1, characterized in that, The top surface of the portal abuts against the bottom surface of the first annular body, and the inner side surface of the portal abuts against the outer side surface of the second annular body.

6. The circular loom according to any one of claims 1 to 5, characterized in that The number of the support rods does not exceed 10.

7. The circular loom according to claim 6, characterized in that, There are two lower connecting portions, which extend towards both sides relative to the upper connecting portion to form a Λ-shaped structure.

8. The circular loom according to claim 6, characterized in that, The bottom end of the lower connecting portion is provided with a connecting foot. The connecting foot extends from the outside to the inside relative to the upper door ring. The lower connecting portion is fixedly connected to the upper door ring through the connecting foot.

9. The circular loom according to claim 6, characterized in that, The upper connecting portion is fixedly connected to the second annular body; alternatively, the upper connecting portion is fixedly connected to the inner side surface of the portal, and the number of the support rods is equal to the number of the portals.

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