A needle holder for making a densely packed roving and a weft knitting machine

Abstract

The application relates to the technical field of weft knitting machines, and provides a needle holder for making thick roving and a weft knitting machine, which comprises a needle holder, the needle holder is provided with needle grooves for linear movement of knitting needles, the end face of the groove wall at the needle-out end of the needle groove is provided with a yarn guide surface, the surface where the yarn guide surface is located is gradually inclined from the needle-out direction to the needle-in direction, one end of the yarn guide surface away from the groove bottom is located on one side of the needle-in direction at the needle-out end, and the yarn guide surface is used for supporting new yarn and guiding the upward movement of old loops when the knitting needle is retracted. The yarn guide surface is arranged to improve the slot thickness width of the downward movement of the yarn, so that the new yarn can adopt thicker yarn, the new yarn can be in a clamped angle tension state under the cooperation of the traction force of the needle tongue and the supporting force of the yarn guide surface, balance and stability are provided for the two sides of the needle tongue, the needle tongue can be in a stable moving state, and the needle shaking phenomenon is reduced.

Description

Technical Field

[0001] This application relates to the technical field of weft knitting machines, and in particular to a needle holder and a weft knitting machine for producing densely woven fabric. Background Technology

[0002] In the loop-forming process of a double-sided weft knitting machine (such as a circular knitting machine), the movement of the knitting needle is crucial. The needle hook pulls the new yarn toward the needle groove. As it descends, the old loop is pulled and causes the needle latch to close. At the same time, the old loop passes over the needle hook to release the loop. At this point, the new yarn forms a new loop, and the old loop is looped onto the new loop, completing one loop-forming cycle.

[0003] In the high-speed knitting operation of a double-sided knitting machine, to ensure the effective implementation of the loop-out and loop-forming process, the hook part of the needle latch and the new yarn it hooks need to be further displaced into the needle groove so that the old loop located at the needle groove opening can completely pass over the hook. Figure 1 , Figure 2 As shown. If the hook does not move further into the needle groove, the top of the hook and the new yarn it hooks can easily block the unhooking path of the old loop, reducing the success rate of unhooking. This is especially true in high-speed knitting, where millimeter-level matching accuracy is required, making knitting problems more obvious. Incomplete or abnormal unhooking can lead to poor unhooking, which may cause defects such as yarn slippage, i.e., the loop structure unraveling, affecting product quality.

[0004] At the same time, because the yarn will enter the needle groove along with the hook part of the knitting needle, such as Figure 3 As shown, the yarn thickness needs to match the needle groove width to allow for its movement within the needle groove along with the needle latch. Typically, the yarn thickness requirement is less than (needle groove width - needle thickness) / 2. If the yarn thickness exceeds this upper limit, it is prone to clogging at the needle groove opening, affecting needle movement and hindering effective knitting. Furthermore, the higher the required knitting density, the denser the needle groove distribution on the circular knitting machine cylinder needs to be (referring to the number of needle grooves per inch of cylinder length, usually expressed in the circular knitting machine designation, abbreviated as "G", such as 18G, 24G, 28G, 32G, etc.; the higher the G value, the denser the needle grooves). A smaller needle groove width allows for a smaller required yarn thickness. If roving is to be used, as mentioned earlier, to ensure smooth knitting, the needle groove width must be widened. However, a wider needle groove reduces the number of needle grooves, resulting in a lower knitting density and a looser fabric structure, making it difficult to obtain high-density knitted fabric. This is why high-density knitted fabrics are usually knitted from fine yarn. So how can we obtain high-density fabric woven from coarser yarns while ensuring smooth knitting? Summary of the Invention

[0005] To address the above issues, this application provides a needle holder and weft knitting machine for producing densely woven fabrics, which, compared to existing technologies, allows for dense knitting using thicker yarns without altering the size and specifications of the circular knitting machine.

[0006] This application provides a needle holder and weft knitting machine for producing densely woven fabric, employing the following technical solution:

[0007] A needle holder for making roving fabric includes a needle holder with a needle groove for linear movement of the needle. The end face of the groove wall at the needle exit end has a yarn guide surface. The surface of the yarn guide surface gradually slopes from the needle exit direction to the needle take-off direction. The end of the yarn guide surface away from the bottom of the needle groove is located on the side of the needle exit end in the needle take-off direction. The yarn guide surface is used to support the new yarn and guide the old loop upward when the needle takes off.

[0008] By adopting the above technical solution, during the needle pull-down process, the needle tongue rotates and the needle hook abuts. At this time, the old loop is affected by the knitting cloth force formed earlier and is lifted up by the yarn guide surface. The new yarn moves down with the needle tongue hook. During the movement, the new yarn can be placed on the yarn guide surface to move down along the yarn guide surface. There is relative movement between the old loop, the needle tongue, and the new yarn, which facilitates the old loop to come off the loop, and the new yarn forms a new loop. The old loop is looped on the new loop to complete one loop formation.

[0009] Meanwhile, due to the presence of a yarn guide surface to increase the width of the groove for yarn downward movement, thicker yarns can be used. For example, the upper limit of yarn thickness can be increased to (groove width - needle thickness) / 2 + groove wall thickness. In this case, the new yarn does not enter the needle groove, but it will be in an angled tension state under the combined force of the needle tongue's traction and the yarn guide surface's support. This provides a balancing and stabilizing effect on both sides of the needle tongue, allowing the needle tongue to move in a stable state, reducing needle shaking, reducing uneven knitting loop lengths caused by instability in the loop-forming process due to needle shaking, and reducing knitting defects such as horizontal stripes and cloud spots on the knitted fabric surface.

[0010] Preferably, the yarn guide surface is planar.

[0011] By adopting the above technical solution, the yarn guide surface is set as a plane. During the needle take-off process, the plane yarn guide surface can stably support the new yarn, allowing the new yarn to move smoothly down along the plane. At the same time, it can better guide the old loop to move upward, promoting relative movement between the old loop, the needle tongue, and the new yarn, making it easier for the old loop to complete the loop-off action. Moreover, compared with non-planar complex shapes, the plane yarn guide surface is easier to process. Since the needle groove itself has a very thin wall, the plane setting can improve the processing success rate.

[0012] Preferably, the yarn guide surface is an arc-shaped surface, and the convex side of the arc-shaped surface faces the needle take-off direction.

[0013] The above-mentioned technical solution, which includes a yarn guide surface, is primarily designed to produce densely woven rovings. However, this presents a challenge during manufacturing: relatively high friction. To address this, the yarn guide surface is made curved, reducing friction between the yarn and the guide surface, thus minimizing yarn and needle wear. This is particularly suitable for roving materials with lower strength. Furthermore, reduced yarn wear further minimizes loop formation caused by yarn damage, decreasing the probability of knitting defects such as horizontal stripes and cloudiness on the fabric surface, thereby improving the quality of knitted products.

[0014] Preferably, the yarn guiding surface includes a plurality of sub-inclined surfaces connected in sequence and arranged in a stepped manner.

[0015] By adopting the above technical solution, the guide surface composed of sub-inclined surfaces with multiple steps can be adapted to rovings of different thicknesses. When the knitting needles are drawn back, the new yarns of different thicknesses can be graded and supported, making it easier to adjust the tension of the new yarns, reducing uneven tension of the new yarns, thereby reducing defects caused by yarn tension problems during the knitting process, improving the adaptability of knitting, and facilitating the production of dense fabrics with various specifications of rovings.

[0016] Preferably, the connection between the plurality of sub-inclined surfaces is an inclined transition surface.

[0017] By adopting the above technical solution, the connection between multiple sub-inclined surfaces is set as an inclined transition surface, which can reduce the occurrence of right angles between two adjacent sub-inclined surfaces, reduce the collision and jamming of the yarn with the connection during the movement, make the transition of the new yarn between multiple sub-inclined surfaces smoother, further adapt to rovings of different thicknesses, make the tension of the new yarn easier to adjust, improve knitting adaptability, and at the same time reduce the wear of yarn and needle, ensure the smooth progress of the knitting process, and help to obtain high-density fabrics woven from coarser yarns.

[0018] Preferably, the needle holder is provided with a heat dissipation mechanism, the heat dissipation mechanism includes a first delivery pipe passing through the needle holder to deliver refrigerant, the needle holder has a heat dissipation channel for refrigerant flow, two first delivery pipes are provided and are respectively connected to the two ends of the heat dissipation channel, the two first delivery pipes are respectively used to deliver refrigerant into the needle holder and to output the heat-exchanged refrigerant out of the needle holder.

[0019] By adopting the above technical solution, a heat dissipation mechanism is set on the needle holder, and a refrigerant is transported through the first delivery pipe passing through the needle holder. The refrigerant flows in the heat dissipation channel opened in the needle holder and exchanges heat with the needle holder, carrying away the large amount of heat generated by knitting at high speed using roving. The heat-exchanged refrigerant is then output through the first delivery pipe passing through the needle holder, which can dissipate heat from the needle holder in a timely and effective manner, reduce the impact of heat accumulation on the needle latch and yarn, ensure the stable performance of the needle latch and yarn during the knitting process, reduce knitting failures caused by overheating, and improve the quality and efficiency of knitting.

[0020] Preferably, the heat dissipation mechanism further includes an exhaust pipe, the exhaust direction of which is toward the opening area of ​​the needle groove, and the exhaust pipe is used to transport gas or a gas-liquid mixture containing a lubricating medium.

[0021] By adopting the above technical solution, the air outlet pipe delivers gas or a gas-liquid mixture containing lubricating medium to the opening area of ​​the needle groove. When delivering gas, it can dissipate heat from the needle groove and knitting needles, reducing the impact of the large amount of heat generated by knitting with roving at high speed on the needle latch and yarn. In addition, some dust will fall off during the knitting process, so the air outlet pipe can also be used to blow away the dust that falls into the needle groove, thereby reducing the accumulation of dust in the needle groove and affecting the movement of subsequent knitting needles.

[0022] When the air outlet pipe delivers a gas-liquid mixture containing a lubricating medium, it not only dissipates heat but also lubricates the needle groove and knitting needles, reducing the frictional resistance of the knitting needles during linear movement within the needle groove, making the knitting needles move more smoothly, ensuring the smooth progress of the knitting process, and improving knitting efficiency and product quality.

[0023] Preferably, the heat dissipation mechanism further includes a collection component located on the extension path of the air outlet pipe in the blowing direction, for collecting dust blown away by the air outlet pipe. The collection component includes a dust collection cylinder with an inlet on the extension path of the air outlet pipe after it bounces off the needle groove. The dust collection cylinder has a receiving cavity for containing dust, which is connected to the inlet. An air extraction component is provided on the dust collection cylinder.

[0024] By adopting the above technical solution, during the production of dense roving fabric, fiber dust generated by high-speed knitting is blown away by the air outlet pipe, and the collection component, positioned along the extended path, collects this dust. Specifically, the dust collection cylinder in the collection component has an inlet tangentially to the air outlet pipe's blowing path. When the air outlet pipe blows out air containing dust, the airflow smoothly enters the dust collection cylinder's receiving cavity tangentially, reducing the amount of dust escaping the collection area due to collisions. Simultaneously, the suction device on the dust collection cylinder generates suction, enhancing the force of dust entering the receiving cavity, allowing for more efficient collection of dust into the cavity. This reduces dust accumulation around the needle holder, thereby minimizing the impact of dust accumulation on the normal operation of the needle holder and the knitting quality, ensuring the smooth production process of dense roving fabric.

[0025] Preferably, the heat dissipation mechanism further includes a collection component located on the extension path of the air outlet pipe in the blowing direction, for collecting dust and debris blown away by the air outlet pipe. The collection component includes a rotating frame, an adsorption element rotatably connected to the rotating frame, and a driving element for driving the adsorption element to rotate. The outer surface of the adsorption element is positioned facing the blowing path of the air outlet pipe for absorbing and capturing the blown lubricating liquid and / or fibrous dust.

[0026] By adopting the above technical solution, during the heat dissipation process of the needle holder, the air outlet pipe blows through the needle groove opening area, generating dust, lubricating liquid, or fibrous dust. A collection component positioned along the blowing path of the air outlet pipe effectively collects these substances. The rotating frame within the collection component provides support for the adsorption element, which is rotatably connected to the frame and driven to rotate by a drive component. The outer surface of the adsorption element faces the blowing path of the air outlet pipe. When airflow containing dust, lubricating liquid, or fibrous dust arrives, the adsorption element can promptly and effectively absorb and capture it, reducing the diffusion of these substances into the surrounding environment and minimizing their impact on equipment operation and the cleanliness of the working environment.

[0027] A weft knitting machine includes a base, a needle holder rotatably connected to the base, and a drive mechanism for driving the needle holder to rotate.

[0028] In summary, this application has the following beneficial effects:

[0029] The designed yarn guide surface facilitates the release of old loops. During the needle take-off and downward movement, the yarn guide surface lifts the old loops upward, while the new yarn rests on the yarn guide surface and moves downward with the needle tongue. The relative movement of the old loops, needle tongue, and new yarn facilitates the release of loops. Thicker yarns can be used, and the upper limit of the new yarn thickness can be increased to (needle groove width - needle thickness) / 2 + groove wall thickness. The new yarn does not enter the needle groove and is tensioned at an angle under the combined traction force of the needle tongue and the supporting force of the yarn guide surface, providing a balancing and stabilizing effect for the needle tongue and reducing needle shaking and knitting defects. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of old coil decoupling in existing technology;

[0031] Figure 2 This is a schematic diagram of the structure in the prior art where the new coil enters the needle groove;

[0032] Figure 3 This is a three-dimensional structural diagram of a new coil entering a needle groove in existing technology;

[0033] Figure 4 This is a schematic diagram of the structure of a knitting needle holder for making a densely packed roving in Embodiment 1;

[0034] Figure 5 yes Figure 4 A magnified view of part A in the middle;

[0035] Figure 6 This is a schematic diagram of the structure of the new coil abutting against the yarn guide surface in Embodiment 1;

[0036] Figure 7 This is a schematic diagram of the arc-shaped surface in Embodiment 1;

[0037] Figure 8 This is a schematic diagram of the sub-inclined surface in Embodiment 1;

[0038] Figure 9 This is a schematic diagram of the inclined transition surface in Embodiment 1;

[0039] Figure 10 This is a front view structural diagram of Embodiment 1;

[0040] Figure 11 This is a schematic diagram of the heat dissipation mechanism in Embodiment 1;

[0041] Figure 12 This is a schematic diagram of the weft knitting machine in Embodiment 1;

[0042] Figure 13 This is a schematic diagram of the structure of the second conveying pipe in Embodiment 1;

[0043] Figure 14 This is a schematic diagram of the structure of the collecting component in Embodiment 2;

[0044] Figure 15 This is a schematic diagram of the structure of the collecting component in embodiment 3;

[0045] Figure 16 This is a top view of the collection component in embodiment 3.

[0046] Explanation of reference numerals in the attached drawings: 1. Needle holder; 11. Needle groove; 12. Needle barrel; 13. Needle plate; 14. Heat dissipation channel; 2. Knitting needle; 21. Needle hook; 22. Needle tongue; 3. Yarn guide surface; 31. Flat surface; 32. Arc-shaped surface; 33. Sub-inclined surface; 34. Inclined transition surface; 4. New yarn; 41. New loop; 5. Old loop; 6. Heat dissipation mechanism; 61. First delivery pipe; 62. Air outlet pipe; 63. Second delivery pipe; 7. Base; 71. Drive mechanism; 72. Triangle seat; 721. Needle barrel triangle 722. Pin plate triangular seat; 73. Mounting bracket; 8. Collection assembly; 81. Dust collection cylinder; 811. Receiving cavity; 812. Inlet; 813. Exhaust component; 814. Filter screen; 815. Dust collection trough; 816. Sponge pad; 817. Slot; 818. Scraper; 82. Rotating frame; 821. Rotating rod; 822. Groove; 823. Insert block; 824. Connecting bolt; 83. Adsorption component; 831. Unwinding roller; 832. Rewinding roller; 833. Adhesive paper; 84. Drive component. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 1 - Appendix Figure 16 This application will be described in further detail below.

[0048] This application discloses a needle holder and a weft knitting machine for producing densely woven fabric.

[0049] Example 1

[0050] A needle holder for making coarse yarn fabric, see reference Figure 4 , Figure 5 The system includes a needle holder 1, on which a needle groove 11 is provided for the linear movement of the knitting needle 2. A yarn guide surface 3 is provided on the end face of the groove wall at the needle exit end of the needle groove 11. It should be noted that since the knitted fabric is double-sided, the corresponding needle holder 1 specifically includes a needle cylinder 12 for mounting the vertically arranged knitting needle 2 and a needle plate 13 for mounting the horizontally arranged knitting needle 2.

[0051] The yarn guide surface 3 is located on a surface that gradually slopes from the needle exit direction towards the needle take-off direction. The end of the yarn guide surface 3 furthest from the bottom of the needle groove 11 is located on the side of the needle exit end in the needle take-off direction. The yarn guide surface 3 is used to support the new yarn 4 and guide the old loop 5 upwards when the knitting needle 2 takes off. Figure 6 As shown. Therefore, the structural feature of the yarn guide surface 3 is its inclined setting. This setting allows the old loop 5 to be lifted and moved upward during the down-moving process of the needle 2, while the new yarn 4 is hooked and moved downward along with the needle tongue 22. The new yarn 4 can be placed on the yarn guide surface 3 and moved downward.

[0052] In this embodiment, the yarn guide surface 3 can take various forms, such as... Figure 5 , Figure 6When the plane 31 is shown, since the yarn guide surface 3 of the plane 31 is relatively easy to process and the success rate is high, the included angle α formed between the plane 31 and the needle groove 11 is greater than 0 degrees and less than 90 degrees. The specific setting of the α angle is based on the thickness of the yarn.

[0053] Or as Figure 7 When the arc-shaped surface 32 is shown, the convex surface of the yarn guide surface 32 faces the needle take-off direction, which can reduce the friction between the yarn and the yarn guide surface 3, reduce yarn wear and needle holder 1 wear, and is especially suitable for low-strength roving materials; or as shown Figure 8 As shown, the yarn guide surface 3 is composed of multiple sequentially connected, stepped sub-inclined surfaces 33. This multi-step structure can accommodate rovings of different thicknesses. Through the graded support of the stepped surfaces, the tension of the new yarn 4 is more easily adjusted, improving knitting adaptability. When the yarn guide surface 3 is composed of multiple sub-inclined surfaces 33, the connections between the multiple sub-inclined surfaces 33 can be as follows... Figure 9 As shown, the inclined transition surface 34 reduces the problems caused by setting right angle surfaces and makes the yarn move more smoothly on the yarn guide surface 3.

[0054] Reference Figure 10 It should be noted that, due to the presence of the yarn guide surface 3 to increase the width of the groove for yarn downward movement, the new yarn 4 can be made of thicker yarn. The corresponding upper limit of the thickness can be increased to (groove width w1 of needle groove 11 - needle thickness t1) / 2 + groove wall thickness t2. At this time, the new yarn 4 does not enter the interior of the needle groove 11, but the new yarn 4 will be in a tensioned state with an angle under the combined force of the traction of the needle tongue 22 and the supporting force of the yarn guide surface 3, providing a balancing and stabilizing effect on both sides of the needle tongue 22, so that the needle tongue 22 can be in a stable moving state, reducing needle shaking, reducing the uneven knitting loop length caused by the instability of the loop forming process due to needle shaking, and reducing knitting defects such as horizontal stripes and cloud spots on the knitted fabric surface.

[0055] Reference Figure 11Furthermore, due to the use of roving, more heat will be generated between the knitting needle 2 and the roving during use. To address this, in this embodiment, a heat dissipation mechanism 6 is provided on the needle holder 1. The heat dissipation mechanism 6 includes a first delivery pipe 61 and an outlet pipe 62. The first delivery pipe 61 passes through the needle holder 1 and is constructed as a pipe. Two first delivery pipes 61 are provided, one for delivering refrigerant into the needle holder 1 and the other for outputting the refrigerant after heat exchange. The first delivery pipe 61 can be made of metal, such as copper, which has good thermal conductivity, or it can be made of plastic, which has the advantages of being lightweight and low-cost. A heat dissipation channel 14 is provided inside the needle holder 1 for the refrigerant to flow. Its shape can be a tortuous channel, or arranged in a ring or spiral around the needle holder 1 to increase the flow path of the refrigerant within the needle holder 1 and improve heat exchange efficiency. The two first delivery pipes 61 are respectively connected to the two ends of the heat dissipation channel 14. The refrigerant enters the heat dissipation channel 14 through the first delivery pipe 61, exchanges heat with the needle holder 1, and then flows out through the first delivery pipe 61. It should be noted that the refrigerant is specifically lubricating oil, and the refrigerant is transported through an external refrigerant circulation device connected to two first delivery pipes 61, which specifically includes an oil pump and an oil tank connected to the oil pump.

[0056] In this embodiment, the outlet pipe 62 is oriented towards the opening area of ​​the needle groove 11, and is used to transport gas or a gas-liquid mixture containing a lubricating medium. The outlet pipe 62 can be a straight pipe or a pipe with a certain bending angle to better transport the gas or gas-liquid mixture to the opening area of ​​the needle groove 11. It should be noted that the gas transported by the outlet pipe 62 can be air or an inert gas such as nitrogen, and the lubricating medium can be lubricating oil, etc. For the installation of the outlet pipe 62, the outlet pipe 62 is specifically installed on the triangular base 72, which includes a mounting plate fixed on the outlet pipe 62 and mounting bolts passing through the mounting plate. The mounting bolts are threadedly connected to the triangular base 72.

[0057] The implementation principle of a needle holder for producing densely packed roving in this embodiment is as follows: The needle holder in this embodiment, through a specially designed yarn guide surface 3, effectively guides the movement of the old loop 5 and the new yarn 4 during the take-off and downward movement of the needle 2. This allows the old loop 5 to smoothly unravel, and the new yarn 4 to move stably downward. Simultaneously, the new yarn 4 does not enter the needle groove 11, allowing for the use of thicker yarn. Furthermore, the new yarn 4, under the combined traction of the needle tongue 22 and the supporting force of the yarn guide surface 3, maintains an angled tension, providing balance and stability to both sides of the needle tongue 22. This solves the problems of low loop unraveling success rate and limited yarn thickness in existing technologies, enabling the use of thicker yarn for high-density knitting while ensuring smooth knitting, thus improving product quality and production efficiency. Simultaneously, the heat dissipation mechanism 6 effectively dissipates heat generated during high-speed knitting, protecting the needle tongue 22 and the yarn, further improving knitting stability and product quality, representing a significant improvement and contribution to existing technologies.

[0058] This application also discloses a weft knitting machine, with reference to... Figure 12 It includes a base 7, a needle holder rotatably connected to the base 7, a drive mechanism 71 for driving the needle holder to rotate, and several triangular seats 72 fixed on the base 7. Since it is a double-sided fabric, the corresponding triangular seats 72 are a cylinder triangular seat 721 and a needle plate triangular seat 722. As the drive mechanism 71 drives the needle holder to rotate, the triangular seats 72 are used to drive the needle 2 to enter and exit the needle groove 11.

[0059] Reference Figure 13 Furthermore, the heat dissipation mechanism 6 also includes a second delivery pipe 63. Several groups of second delivery pipes 63 are arranged at intervals around the axis of the needle holder. One group includes several second delivery pipes 63. Several second delivery pipes 63 are arranged at intervals along the height direction of the needle cylinder cam seat 721. Several second delivery pipes 63 are arranged along the length direction of the needle plate cam seat 722. The second delivery pipes 63 pass through the cam seat 72, thereby delivering lubricating oil to the cam seat 72. The lubricating oil flows to the guide rail opened on the cam seat 72 and flows to the needle 2 and the unexposed needle groove 11 to play a role in cooling and lubrication.

[0060] Example 2

[0061] Reference Figure 14The difference from Embodiment 1 is that the heat dissipation mechanism 6 also includes a collection component 8. The collection component 8 is mounted on the base 7 via a mounting bracket 73. The collection component 8 is located on the extension path of the air outlet pipe 62 in the blowing direction and is used to collect dust and debris blown away by the air outlet pipe 62. In this embodiment, the collection component 8 includes a dust collection cylinder 81, which has a receiving cavity 811 for containing dust and debris. The dust collection cylinder 81 has an inlet 812 on the extension path after the air outlet pipe 62 bounces off the needle groove 11. The inlet 812 is connected to the receiving cavity 811. An air extraction component 813 is provided on the dust collection cylinder 81. The air extraction component 813 may include an air extraction pipe fixedly inserted through the dust collection cylinder 81 and an air extraction pump connected to the air extraction pipe. Through the action of the air extraction pump, the dust and debris blown out by the air outlet pipe 62 is sucked into the receiving cavity 811 through the inlet 812. A filter screen 814 is provided inside the dust collection cylinder 81 at the inlet end of the exhaust pipe, and a dust collection trough 815 is provided in the receiving cavity 811 below the filter screen 814.

[0062] Furthermore, a sponge pad 816 with an adsorption function is provided on the filter screen 814 to adsorb oil and block dust. Under the influence of gravity, it will flow into the dust collection trough 815 below. The dust collection trough 815 is then detachably connected to the dust collection cylinder 81, specifically installed by bolts, so as to facilitate disassembly, cleaning and replacement. Specifically, a slot 817 is opened on the side wall or bottom wall of the dust collection cylinder 81 for the dust collection trough to slide and insert. For cleaning the sponge, a scraper 818 can be provided on the dust collection trough 815. The scraper 818 is pressed against the sponge pad. When the slot 817 is set on the bottom wall of the dust collection cylinder 81, when the dust collection trough 815 is moved, it causes the scraper 818 to press against the sponge pad 816, thereby squeezing out the oil contained therein and the dust attached to the sponge pad.

[0063] By collecting dust and debris using component 8, the cleanliness of the knitting environment is ensured, further improving the stability of knitting and product quality, and making a significant improvement and contribution to existing technologies.

[0064] Example 3

[0065] Reference Figure 15 , Figure 16The difference from Embodiment 2 is that the collecting assembly 8 includes a rotating frame 82, an adsorption member 83 rotatably connected to the rotating frame 82, and a driving member 84 for driving the adsorption member 83 to rotate. The outer surface of the adsorption member 83 faces the air outlet pipe 62 and is swept onto the extended path after rebounding from the needle groove 11, for absorbing and capturing the blown lubricating liquid and / or fibrous dust. The adsorption member 83 includes an unwinding roller 831, a winding roller 832, and adhesive paper 833 wound on the unwinding roller 831 and the winding roller 832 to adhere dust flowing in the tangential direction along the blowing path of the air outlet pipe 62. Both the unwinding roller 831 and the take-up roller 832 are detachably connected to the rotating frame 82. Specifically, the rotating frame 82 is rotatably connected to a rotating rod 821, which has a groove 822. Both ends of the unwinding roller 831 and the take-up roller 832 have protruding inserts 823 that fit into the grooves 822. Connecting bolts 824 are threaded onto the inserts 823 and are threaded onto the rotating rod 821. The driving component 84 is a motor, which is fixedly connected to the rotating frame 82. The motor's output shaft is fixedly inserted through the rotating frame 82 and fixedly connected to one of the rotating rods 821. The motor drives the adsorption component 83 to rotate, enabling it to continuously absorb dust or oily dust mixtures. This drive motor can also be connected to a gearbox to control the rotation speed of the take-up roller 832 and the unwinding roller 831.

[0066] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A needle holder for making coarse yarn dense fabric, characterized in that: Includes a needle holder (1), on which a needle groove (11) is provided for the linear movement of the knitting needle (2). The end face of the groove wall at the needle exit end of the needle groove (11) is provided with a yarn guide surface (3). The surface of the yarn guide surface (3) gradually slopes from the needle exit direction to the needle retraction direction. The end of the yarn guide surface (3) away from the bottom of the needle groove (11) is located on the side of the needle exit end in the needle retraction direction. The yarn guide surface (3) is used to support the new yarn (4) and guide the old loop (5) to move upward when the knitting needle (2) retracts.

2. The needle holder for making roving fabric according to claim 1, characterized in that: The yarn guide surface (3) is a plane (31).

3. A needle holder for making roving fabric according to claim 1, characterized in that: The yarn guide surface (3) is an arc-shaped surface (32), and the convex surface of the arc-shaped surface (32) faces the needle take-off direction.

4. A needle holder for making roving fabric according to claim 1, characterized in that: The yarn guide surface (3) includes multiple sub-inclined surfaces (33) that are connected in sequence and arranged in a stepped manner.

5. A needle holder for making roving fabric according to claim 4, characterized in that: The connection between the multiple sub-inclined surfaces (33) is an inclined transition surface (34).

6. A needle holder for making roving fabric according to claim 1, characterized in that: The needle holder (1) is provided with a heat dissipation mechanism (6). The heat dissipation mechanism (6) includes a first delivery pipe (61) passing through the needle holder (1) to deliver refrigerant. The needle holder (1) has a heat dissipation channel (14) for refrigerant flow. There are two first delivery pipes (61) and they are respectively connected to the two ends of the heat dissipation channel (14). The two first delivery pipes (61) are respectively used to deliver refrigerant into the needle holder (1) and to output the heat-exchanged refrigerant out of the needle holder (1).

7. A needle holder for making roving fabric according to claim 6, characterized in that: The heat dissipation mechanism (6) also includes an exhaust pipe (62), the exhaust direction of which is toward the opening area of ​​the needle groove (11), and the exhaust pipe (62) is used to transport gas or a gas-liquid mixture containing a lubricating medium.

8. A needle holder for making roving fabric according to claim 7, characterized in that: The heat dissipation mechanism (6) also includes a collection component (8), which is located on the extension path of the air outlet pipe (62) in the blowing direction and is used to collect dust blown away by the air outlet pipe (62). The collection component (8) includes a dust collection cylinder (81), which has an inlet (812) on the extension path of the air outlet pipe (62) after it bounces back towards the needle groove (11). The dust collection cylinder (81) has a receiving cavity (811) for containing dust, which is connected to the inlet (812). The dust collection cylinder (81) is provided with an air extraction component (813).

9. A needle holder for making roving fabric according to claim 7, characterized in that: The heat dissipation mechanism (6) further includes a collection component (8), which is located on the extension path of the air outlet pipe (62) in the blowing direction and is used to collect dust blown away by the air outlet pipe (62). The collection component (8) includes a rotating frame (82), an adsorption element (83) rotatably connected to the rotating frame (82), and a driving element (84) for driving the adsorption element (83) to rotate. The outer surface of the adsorption element (83) faces the extension path after the air outlet pipe (62) bounces off the needle groove (11) and is used to absorb and capture the blown lubricating liquid and / or fiber dust.

10. A weft knitting machine, characterized in that: It includes a base (7), a needle holder rotatably connected to the base (7), and a drive mechanism (71) for driving the needle holder to rotate, wherein the needle holder is the needle holder according to any one of claims 1-9.

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