Needle bed drive structure with improved motion accuracy

Abstract

The present application relates to the field of textile equipment, in particular to a needle bed driving structure with improved motion precision, comprising a transmission assembly, a cam assembly, a roller assembly, a connecting rod assembly, a air supply assembly and a cleaning assembly. The present application utilizes the cam body of the cam assembly to set a plurality of air outlet holes in a scattering double-layer arrangement with corrugated hole walls, which blows the cold air provided by the air supply assembly to the outside of the outer and inner curved surfaces of the cam body, forming a cold air flow layer to cool and isolate the dust of the cam assembly and the wheel body of the roller assembly, to avoid the heat deformation of the cam or the roller, which changes the size of the cam curved surface and affects the curved surface track; the cleaning shovel of the cleaning assembly shovels and scrapes the outer curved surface of the cam body and sucks the floating dust, to avoid the continuous adhesion and accumulation of the floating dust on the cam, which is rolled by the roller of the roller assembly, changes the size of the cam curved surface and affects the curved surface track, so that the motion precision of the needle bed body can be improved, and the product quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile equipment, in particular to a needle bed driving structure with improved movement accuracy. BACKGROUND

[0002] The needle bed is an important unit of the loop forming section of the high-speed warp knitting machine. The needle bed comprises a needle bed body and a driving structure for driving the needle bed body to move up and down according to a certain rule. The needle bed body is provided with a needle bed seat, a needle rail, a knitting needle and a sliding seat for controlling the up and down sliding of the needle bed seat. The needle bed can be divided into a single needle bed and a double needle bed. At present, the double needle bed is widely used. The double needle bed is composed of two symmetrical front and rear single needle beds. The driving structure type of the needle bed is mostly a crank connecting rod type or a cam connecting rod type. However, the connecting rod and the hinge connecting member of the driving structure of the crank connecting rod type are generally in a large number. For example, the utility model patent of the double needle warp knitting machine with the authorization announcement number CN203320243U is described as follows: "... the front and rear needle bed transmission mechanisms each have a needle bed crank. The needle bed crank and the tongue needle bed are connected by a first needle bed connecting rod, a second needle bed connecting rod, a third needle bed connecting rod, a fourth needle bed connecting rod, a fifth needle bed connecting rod, a sixth needle bed connecting rod, a seventh needle bed connecting rod and an eighth needle bed connecting rod...". "... the needle bed crank of the front and rear needle bed transmission mechanisms is connected with the first needle bed connecting rod through a bearing roller. The first needle bed connecting rod and the second needle bed connecting rod are connected with a pin shaft on the first support. The first support is connected with the machine frame. The second needle bed connecting rod and the third needle bed connecting rod are connected with a pin shaft on the second support. The second support is connected with the machine frame. The third needle bed connecting rod and the fourth needle bed connecting rod are connected with a pin shaft. The fourth needle bed connecting rod is connected with the machine frame through a fixed shaft. The fourth needle bed connecting rod and the fifth needle bed connecting rod are connected with a pin shaft. The sixth needle bed connecting rod and the seventh needle bed connecting rod are connected with a pin shaft on the needle bed swing arm. The needle bed swing arm is connected with the machine frame. The seventh needle bed connecting rod and the eighth needle bed connecting rod are directly connected...". As can be seen, the driving structure of the crank connecting rod type needs too many connecting rods and hinge connecting members. Too many connecting rods and hinge connecting members can easily increase the accumulated error and failure rate of the driving structure, affect the transmission efficiency and the movement precision of the needle bed body, and further affect the product quality. In addition, it is difficult for the crank connecting rod mechanism to realize the variable curve motion trajectory. It is also difficult to meet the requirements of the complex motion process required by the needle bed body of the modern high-speed warp knitting machine. Since the cam surface form is easy to design and process, the cam connecting rod type needle bed driving structure is more suitable for the complex motion needs of the needle bed body of the modern high-speed warp knitting machine. However, the cam connecting rod mechanism realizes the connecting rod movement through the friction between the cam and the roller rotatingly connected with the end of the connecting rod. The friction between the high-speed rotating cam and the roller can easily increase the temperature of the cam and the roller. If the temperature cannot be lowered in time, the cam or the roller will be thermally deformed, which will affect the cam surface trajectory and further affect the movement precision of the needle bed body. In addition, many fibers and dust on the yarn will fall from above to the cam during the operation of the warp knitting machine. If the floating dust cannot be cleaned in time, it will also be easily crushed by the roller and adhered to the cam, which will change the size of the cam surface and affect the movement precision of the needle bed body. Therefore, it is necessary to provide a needle bed driving structure that can improve the movement precision to solve the existing problems. In view of this, the present case arises. SUMMARY

[0003] In order to overcome the deficiencies in the prior art, the present application discloses a needle bed driving structure with improved movement precision, comprising a transmission assembly, a cam assembly, a roller assembly, a connecting rod assembly, a air supply assembly and a cleaning assembly. The transmission assembly can drive the cam assembly to rotate, the cam assembly is provided with a cam body with an outer curved surface and an inner curved surface, and a plurality of air outlet holes are arranged in a scattering manner on the cam body, the air outlet holes are arranged on the inner layer and the outer layer of the cam body, and the hole wall of the air outlet hole is in a corrugated shape; the air supply assembly can provide cold air to the inside of the cam assembly, and the cold air can be blown to the outside of the outer curved surface and the inner curved surface of the cam body through the plurality of air outlet holes; the roller assembly is provided with an upper roller and a lower roller, the outer surfaces of the upper roller and the lower roller can respectively abut against the outer curved surface and the inner curved surface of the cam body; the connecting rod assembly is arranged above the roller assembly and is hinged to the roller assembly for driving the needle bed body to move up and down; the cleaning assembly is provided with a cleaning shovel which can elastically abut against the outer curved surface of the cam body. The cold air provided by the air supply assembly is blown to the outside of the outer curved surface and the inner curved surface of the cam body through the plurality of air outlet holes arranged in a scattering double-layer manner and with corrugated hole walls on the cam body, forming a cold air flow layer to cool and isolate dust for the cam assembly and the roller assembly of the roller assembly, so as to avoid the thermal deformation of the cam or the roller, which changes the size of the cam curved surface and affects the curved surface track; the cleaning shovel of the cleaning assembly scrapes the outer curved surface of the cam body and sucks the dust, so as to avoid the continuous adhesion and accumulation of dust on the cam and the rolling of the roller of the roller assembly, which changes the size of the cam curved surface and affects the curved surface track, thereby improving the movement precision of the needle bed body and improving the product quality.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] The needle bed driving structure with improved movement precision comprises a transmission assembly provided with a transmission shaft and a driving motor connected with the transmission shaft, characterized in that it further comprises a cam assembly, a roller assembly, a connecting rod assembly, an air supply assembly and a cleaning assembly, the cam assembly is provided with a cam body with an outer curved surface and an inner curved surface, a plurality of air outlet holes are arranged in a scattered manner on the wheel body between the outer curved surface and the inner curved surface of the cam body, the air outlet holes are arranged on the inner layer and the outer layer of the wheel body, the air outlet holes arranged on the outer layer are in communication with the outer part of the outer curved surface, and the air outlet holes arranged on the inner layer are in communication with the outer part of the inner curved surface, the inner wall of the air outlet hole is corrugated to slow down the wind speed, the air supply assembly is arranged on one side of the cam assembly, the air supply assembly can provide cold air to the inside of the cam assembly, and the cold air can be blown to the outside of the outer curved surface and the inner curved surface of the cam body through the air outlet holes to form a cold air flow layer for cooling and isolating floating dust, the cam assembly is connected to the transmission shaft of the transmission assembly, and the transmission assembly can drive the cam assembly to rotate, the roller assembly is provided with an upper roller and a lower roller, the upper roller is arranged above the cam body of the cam assembly, and the outer surfaces of the upper roller and the lower roller are respectively in contact with the outer curved surface and the inner curved surface of the cam body, the connecting rod assembly is arranged above the roller assembly and is hinged to the roller assembly, the upper part of the connecting rod assembly is connected to the needle bed body, the cam assembly can drive the roller assembly to swing up and down to make the connecting rod assembly move up and down, and the connecting rod assembly can drive the needle bed body to move up and down, and the cleaning assembly is provided with a cleaning shovel with a dust collection air duct, the cleaning assembly is slidingly connected to the connecting rod assembly, and the cleaning shovel thereof can elastically contact the outer curved surface of the cam body, the cleaning assembly can scrape the outer curved surface of the cam body and suck floating dust.

[0006] The outer curved surface and the inner curved surface of the cam body are annular continuous curved surfaces, and the rotation radius changes with the fluctuation of the curved surface.

[0007] The two sides of the cam body are recessed towards the middle to form respective inner recessed cavities, the annular surface of the inner recessed cavity on one side is the inner curved surface, the inner recessed cavity on the other side is a wind cavity, an annular air guide groove is arranged in the middle of the wheel body between the outer curved surface and the inner curved surface of the cam body, one side of the air guide groove is open and the other side is closed, the opening of the air guide groove is in communication with the wind cavity, and one end of the plurality of air outlet holes is in communication with the air guide groove, and the diameter of the air outlet hole is not greater than 2mm.

[0008] The cam assembly is further provided with an end plate, the end plate is a circular ring plate body, one side of the end plate is provided with an outwardly extending convex edge, the other side of the end plate is detachably and sealingly connected with the cam body, and the transmission shaft of the transmission assembly penetrates the cam body and the end plate and is detachably and sealingly connected with the cam body.

[0009] The upper roller of the roller assembly is placed above the lower roller. The upper roller and the lower roller each have a mandrel and a bearing. The roller assembly further has a roller frame and a support shaft. The upper roller and the lower roller are connected to the roller frame by their respective mandrels, and the roller bodies of the upper roller and the lower roller are rotatable. The roller frame is rotatably connected to the support shaft, and the support shaft is fixedly connected to an external frame.

[0010] The connecting rod assembly has a telescopically adjustable connecting rod and a Y-shaped hinge head fixedly connected to the lower end of the connecting rod. The Y-shaped hinge head is hinged to the mandrel provided on the upper roller.

[0011] The air supply assembly has an air inlet plate and an air inlet joint. The air inlet plate is an annular plate body. One side of it has a recessed groove inward. The inside of the air inlet plate has an L-shaped air inlet hole. One end of the air inlet hole is exposed, and the other end is communicated with the groove of the air inlet plate. One end of the air inlet joint is connected to the exposed end of the air inlet hole, and the other end of the air inlet joint is communicated with the air supply duct of an external cold air source. The convex edge of the end plate of the cam assembly can be embedded into the groove of the air inlet plate and can rotate in the groove. The air inlet plate is fixedly connected to the external frame by a bracket. The transmission shaft of the transmission assembly passes through the through hole provided at the center of the air inlet plate movably.

[0012] Sealing members are provided between the convex edge of the end plate and the groove of the air inlet plate, and between the through hole provided at the center of the air inlet plate and the transmission shaft of the transmission assembly.

[0013] The cleaning assembly includes a cleaning shovel, a sliding sleeve, springs and fixing rings. The upper end of the cleaning shovel is fixedly connected to the sliding sleeve. The sliding sleeve is slidably connected to the connecting rod of the connecting rod assembly. There are two springs and two fixing rings. Both of the two springs are movably sleeved on the connecting rod of the connecting rod assembly and are respectively placed at both ends of the sliding sleeve. The two fixing rings are fixedly connected to the connecting rod of the connecting rod assembly and are respectively placed at the upper end and the lower end of the two springs.

[0014] The cleaning shovel is a shovel-shaped cavity member with a dust collection air duct inside and an open bottom. The lower part of the cleaning shovel is inclined and gradually becomes wider in its width direction and thinner in its thickness direction to form a scraping surface.

[0015] The cleaning assembly further includes an air extraction joint. One end of the air extraction joint is connected to the cleaning shovel and is communicated with the dust collection air duct of the cleaning shovel. The other end of the air extraction joint is communicated with the suction pipe of an external vacuum cleaner.

[0016] As can be seen from the above description, the advantages of the needle bed drive structure with improved motion accuracy provided by the present invention are as follows: a number of air outlets are arranged in a radiating pattern on the cam body with outer and inner curved surfaces of the cam assembly, and the number of air outlets are distributed on its inner and outer layers, and the walls of the air outlets are corrugated; the air supply assembly can provide cold air to the inside of the cam assembly, and the cold air can be blown to the outside of the outer and inner curved surfaces of the cam body through the number of air outlets; the outer surfaces of the upper roller and the lower roller of the roller assembly can respectively abut against the outer and inner curved surfaces of the cam body; the connecting rod of the linkage assembly is placed above the roller assembly and hinged to the roller assembly to drive the needle bed body to move up and down; the cleaning assembly is provided with a cleaning shovel, which can elastically abut against the outer curved surface of the cam body. First, several air outlets arranged in a radiating, double-layered pattern with corrugated walls on the cam body blow the cold air supplied by the air supply assembly to the outer and inner curved surfaces of the cam body, forming a cold airflow layer to cool the cam assembly and roller assembly and isolate floating dust, thus preventing thermal deformation of the cam or roller from changing the cam surface dimensions and affecting its curved trajectory. Second, the cleaning component uses a cleaning scraper to scrape the outer curved surface of the cam body and suck up floating dust, preventing the dust from continuously adhering and accumulating on the cam and being crushed by the rollers of the roller assembly. The invention addresses several issues: First, changes in surface dimensions affect the surface trajectory. Second, corrugated hole walls reduce the flow speed of cold air, improving cooling efficiency. Third, the reduced airflow pressure isolates dust from the cam and prevents dust from being blown around. Fourth, simplified linkage structure avoids excessive linkages and hinges that increase cumulative errors and failure rates, affecting transmission efficiency and needle bed motion accuracy. The needle bed drive structure improves motion accuracy and product quality through cooling, dust isolation, and simplified linkage structure. This invention is rationally designed, simple in structure, low in cost, and easy to promote. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the needle bed drive structure that can improve motion accuracy according to the present invention;

[0018] Figure 2 for Figure 1 A-direction diagram in the diagram;

[0019] Figure 3 for Figure 2 A magnified diagram of BB in the image;

[0020] Figure 4 This is an enlarged schematic diagram of the cam assembly;

[0021] Figure 5 for Figure 4Enlarged schematic diagram of part C in the diagram;

[0022] Figure 6 This is an enlarged schematic diagram of the air outlet;

[0023] Figure 7 This is an enlarged schematic diagram of the roller assembly;

[0024] Figure 8 for Figure 7 Enlarged diagram of direction D in the diagram;

[0025] Figure 9 This is an enlarged schematic diagram of the air supply component;

[0026] Figure 10 An enlarged diagram of the cleanup components;

[0027] Figure 11 for Figure 10 A schematic diagram of direction E in the diagram.

[0028] Figure label:

[0029] 1. Transmission assembly; 2. Cam assembly; 21. Cam body; 211. Outer curved surface; 212. Inner curved surface; 213. Air cavity; 214. Air guide groove; 215. Air outlet; 22. End plate; 3. Roller assembly; 31. Upper roller; 32. Lower roller; 33. Roller frame; 34. Support shaft; 4. Linkage assembly; 5. Air supply assembly; 51. Air inlet plate; 511. Air inlet hole; 52. Air inlet connector; 6. Cleaning assembly; 61. Cleaning shovel; 611. Dust collection air duct; 612. Scraping surface; 62. Sliding sleeve; 63. Spring; 64. Fixing ring; 65. Exhaust connector; 900. Needle bed body. Detailed Implementation

[0030] The present invention will be further described below through specific embodiments.

[0031] like Figures 1 to 11As shown, the needle bed drive structure of the present invention, which improves motion accuracy, includes a transmission assembly 1, a cam assembly 2, a roller assembly 3, a connecting rod assembly 4, an air supply assembly 5, and a cleaning assembly 6. The transmission assembly 1 is provided with a transmission shaft and a drive motor connected to the transmission shaft. The cam assembly 2 is provided with a cam body 21 and an end plate 22. The cam body 21 includes an outer curved surface 211 and an inner curved surface 212. A plurality of air outlets 215 are arranged in a radiating pattern on the wheel body between the outer curved surface 211 and the inner curved surface 212 of the cam body 21. The plurality of air outlets 215 are respectively located on the inner and outer layers of the wheel body. The air outlets 215 located on the outer layer communicate with the outside of the outer curved surface 211, and the air outlets 215 located on the inner layer communicate with the outside of the inner curved surface 212. The inner wall of the air outlet 215 is corrugated to reduce the air speed. The air supply assembly 5 is located on one side of the cam assembly 2, and the air supply assembly 5 can supply air to the cam. The component 2 provides cold air inside, and the cold air can be blown to the outside of the outer curved surface 211 and inner curved surface 212 of the cam body 21 through several air outlets 215 to form a cold air flow layer for cooling and isolating floating dust. The cam assembly 2 is connected to the drive shaft of the transmission assembly 1, and the transmission assembly 1 can drive the cam assembly 2 to rotate. The roller assembly 3 is provided with an upper roller 31, a lower roller 32, a roller frame 33 and a support shaft 34. The upper roller 31 is placed above the cam body 21 of the cam assembly 2, and the outer surfaces of the upper roller 31 and the lower roller 32 can respectively abut against the outer curved surface 211 and the inner curved surface 212 of the cam body 21. The connecting rod assembly 4 is placed above the roller assembly 3 and is hinged to the roller assembly 3. The upper part of the connecting rod assembly 4 is connected to the needle bed body 900. When the cam assembly 2 rotates, it can drive the roller assembly 3 to swing up and down, causing the connecting rod assembly 4 to move up and down. The connecting rod assembly 4 can drive the needle bed body 900 to move up and down.

[0032] like Figures 3 to 6 As shown, the outer curved surface 211 and inner curved surface 212 of the cam body 21 of the present invention are both annular continuous curved surfaces, and their radius of rotation varies with the undulation of the curved surface. Both sides of the cam body 21 are recessed towards the middle to form concave cavities. The annular surface of the concave cavity on one side is the inner curved surface 212, and the concave cavity on the other side is the air cavity 213. An annular air guide groove 214 is provided in the middle of the wheel body between the outer curved surface 211 and the inner curved surface 212 of the cam body 21. One side of the air guide groove 214 is open and the other side is closed. The open side of the air guide groove 214 is connected to the air cavity 213. One end of several air outlets 215 is connected to the air guide groove 214. The diameter of the air outlets 215 is no greater than 2 mm. The end plate 22 is a circular plate with an outwardly extending protrusion on one side and a detachable and sealed connection to the cam body 21 on the other side. The transmission shaft of the transmission assembly 1 passes through the cam body 21 and the end plate 22 and is detachably and sealed to the cam body 21.

[0033] like Figure 3 , Figure 7and Figure 8 As shown, in the roller assembly 3 of the present invention, the upper roller 31 is positioned above the lower roller 32. Both the upper roller 31 and the lower roller 32 are equipped with a spindle and a bearing. The upper roller 31 and the lower roller 32 are connected to the roller frame 33 by their respective spindles, and the wheel bodies of the upper roller 31 and the lower roller 32 are rotatable. The roller frame 33 is rotatably connected to a support shaft 34, which is fixed to an external frame. The connecting rod assembly 4 is equipped with a telescopically adjustable connecting rod and a Y-shaped hinge joint fixed to the lower end of the connecting rod. The Y-shaped hinge joint is hinged to the spindle of the upper roller 31.

[0034] like Figure 2 , Figure 4 and Figure 9 As shown, the air supply assembly 5 of the present invention includes an air inlet plate 51 and an air inlet connector 52. The air inlet plate 51 is an annular plate with an inwardly recessed groove on one side. An L-shaped air inlet hole 511 is located inside the air inlet plate 51, with one end exposed and the other end connected to the groove. One end of the air inlet connector 52 is connected to the exposed end of the air inlet hole 511, and the other end is connected to the air supply duct of an external cold air source. The protruding edge of the end plate 22 of the cam assembly 2 can be embedded into the groove of the air inlet plate 51 and can rotate within the groove. The air inlet plate 51 is fixed to an external frame by a bracket. The drive shaft of the transmission assembly 1 movably passes through a through hole in the center of the air inlet plate 51. Sealing elements are provided between the protruding edge of the end plate 22 and the groove of the air inlet plate 51, and between the through hole in the center of the air inlet plate 51 and the drive shaft of the transmission assembly 1.

[0035] like Figure 3 , Figure 10 and Figure 11As shown, the cleaning component 6 of the present invention includes a cleaning shovel 61, a sliding sleeve 62, a spring 63, a fixing ring 64, and a suction connector 65. The cleaning component 6 is slidably connected to the connecting rod assembly 4, and its cleaning shovel 61 can elastically abut against the outer curved surface 211 of the cam body 21. The cleaning component 6 can scrape the outer curved surface 211 of the cam body 21 and can suck up floating dust. The cleaning shovel 61 is a shovel-shaped cavity component with an internal dust collection air duct 611 and an open bottom. The lower part of the cleaning shovel 61 is inclined and increases in its width direction while gradually thinning in its thickness direction to form a scraping surface 612. The upper end of the cleaning shovel 61 is fixedly connected to the sliding sleeve 62. The sliding sleeve 62 is slidably connected to the connecting rod of the connecting rod assembly 4 and restricts the sliding sleeve 62 from rotating around the connecting rod. There are two springs 63 and two fixing rings 64. The two springs 63 are movably sleeved on the connecting rod of the connecting rod assembly 4 and are respectively placed at both ends of the sliding sleeve 62. The two fixing rings 64 are fixedly connected to the connecting rod of the connecting rod assembly 4 and are respectively placed at the upper and lower ends of the two springs 63. One end of the exhaust connector 65 is connected to the cleaning shovel 61 and communicates with the dust collection duct 611 of the cleaning shovel 61. The other end of the exhaust connector 65 is connected to the suction pipe of an external vacuum cleaner.

[0036] The method of using the needle bed drive structure that improves motion accuracy is as follows:

[0037] When the warp knitting machine is working, the transmission component 1 of this drive structure drives the cam body 21 of the cam assembly 2 to rotate at high speed; the upper roller 31 and the lower roller 32 of the roller assembly 3 abut and rub against the outer curved surface 211 and the inner curved surface 212 of the cam body 21 respectively. At this time, the cam body 21 of the cam assembly 2 drives the upper roller 31 and the lower roller 32 of the roller assembly 3 and the roller frame 33 to swing up and down around the support shaft 34, so that the connecting rod of the connecting rod assembly 4 moves up and down to drive the needle bed body 900 to move up and down. Because the friction between the upper roller 31 and the lower roller 32 and the cam body 21 generates a lot of heat, the cam body 21 is prone to thermal deformation. Therefore, the cold air source connected to the external air supply assembly 5 can be turned on. The cold air can be sent into the air outlet 215 through the air cavity 213 and the air guide groove 214 of the cam body 21, and diffused to the outside of the outer curved surface 211 and the inner curved surface 212 of the cam body 21 through several corrugated air outlets 215 to form a cold air flow layer for cooling and dust isolation, thus avoiding the influence of thermal deformation on the curved surface dimensions of the cam body 21. In addition, due to the damping effect of the corrugated hole wall of the air outlet 215, the flow speed of the cold air in the air outlet 215 is slowed down, which prolongs the residence time of the cold air inside the cam body 21, thereby improving the cooling effect and ensuring the stability of the curved surface dimensions of the cam body 21. The airflow layer pressure formed by the blown cold air is also reduced, which can keep the airflow layer at a low pressure to isolate floating dust and prevent the floating dust falling from above from accumulating on the surface of the cam body 21 and being rolled into the contact point between the upper roller 31 and the cam body 21 and then accumulating and adhering to the cam body 21. It can also prevent the floating dust from being blown around by the cold air. Meanwhile, when the connecting rod of the linkage assembly 4 moves up and down, it can drive the cleaning shovel 61 of the cleaning assembly 6 to move up and down together. Under the elastic force of the spring 63, the scraping surface 612 of the cleaning shovel 61 always elastically contacts the outer curved surface 211 of the cam body 21. When the cam body 21 rotates, the cleaning shovel 61 can scrape the outer curved surface 211 of the cam body 21. At the same time, the vacuum cleaner connected to the outside of the cleaning assembly 6 is turned on. The floating dust and scraped material isolated by the airflow layer on the periphery of the cam body 21 can be sucked in through the opening at the bottom of the dust collection duct 611 and sucked away by the external vacuum cleaner, which can avoid the floating dust from accumulating and crushing and affecting the curved surface size of the cam body 21.

[0038] This invention utilizes a plurality of air outlets 215 arranged in a radiating double layer on the cam body 21 of the cam assembly 2, with corrugated hole walls, to blow the cold air provided by the air supply assembly 5 to the outside of the outer curved surface 211 and inner curved surface 212 of the cam body 21, forming a cold airflow layer to cool the cam assembly 2 and the roller assembly 3 and isolate floating dust, so as to avoid thermal deformation of the cam or roller causing changes in the cam surface dimensions and affecting its curved trajectory. The cleaning shovel 61 of the cleaning assembly 6 scrapes the outer curved surface 211 of the cam body 21 and sucks up the floating dust, so as to avoid the floating dust from continuously adhering and accumulating on the cam and being crushed by the rollers of the roller assembly 3, which would change the cam surface dimensions and affect its curved trajectory. This can improve the motion accuracy of the needle bed body and improve product quality.

[0039] The above is only one specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing the protection scope of the present invention.

Claims

1. A needle bed drive structure with improved motion accuracy, comprising a transmission assembly (1), wherein the transmission assembly (1) is provided with a transmission shaft and a drive motor connected to the transmission shaft, characterized in that: It also includes a cam assembly (2), a roller assembly (3), a connecting rod assembly (4), an air supply assembly (5), and a cleaning assembly (6). The cam assembly (2) is provided with a cam body (21) with an outer curved surface (211) and an inner curved surface (212). Several air outlets (215) are arranged in a radiating pattern on the wheel body between the outer curved surface (211) and the inner curved surface (212) of the cam body (21). The several air outlets (215) are respectively located on the inner and outer layers of the wheel body. The outer air outlet (215) is connected to the outside of the outer curved surface (211), and the inner air outlet (215) is connected to the outside of the inner curved surface (212). The inner wall of the air outlet (215) is corrugated. The air supply assembly (5) is placed on one side of the cam assembly (2). The air supply assembly (5) can provide cold air to the inside of the cam assembly (2), and the cold air can be blown to the outer curved surface (211) and inner curved surface (212) of the cam body (21) through several air outlets (215). A cold airflow layer is formed outside the cam assembly (2). The cam assembly (2) is connected to the drive shaft of the transmission assembly (1). The transmission assembly (1) can drive the cam assembly (2) to rotate. The roller assembly (3) is provided with an upper roller (31) and a lower roller (32). The upper roller (31) is placed above the cam body (21) of the cam assembly (2), and the outer surfaces of the upper roller (31) and the lower roller (32) can respectively interact with the outer curved surface (211) and the inner curved surface (212) of the cam body (21). 2) The linkage assembly (4) is positioned above the roller assembly (3) and hinged to the roller assembly (3). The cleaning assembly (6) is provided with a cleaning shovel (61) with a dust collection duct (611). The cleaning assembly (6) is slidably connected to the linkage assembly (4) and its cleaning shovel (61) can elastically abut against the outer curved surface (211) of the cam body (21). The cleaning assembly (6) can scrape the outer curved surface (211) of the cam body (21) and can suck up the floating dust.

2. The needle bed drive structure with improved motion accuracy according to claim 1, characterized in that: The outer curved surface (211) and inner curved surface (212) of the cam body (21) are both annular continuous curved surfaces, and their radius of rotation varies with the undulation of the curved surface.

3. The needle bed drive structure with improved motion accuracy according to claim 2, characterized in that: Both sides of the cam body (21) are recessed towards the middle to form concave cavities. The annular surface of the concave cavity on one side is an inner curved surface (212), and the concave cavity on the other side is a wind cavity (213). An annular air guide groove (214) is provided in the middle of the wheel body between the outer curved surface (211) and the inner curved surface (212) of the cam body (21). One side of the air guide groove (214) is open and the other side is closed. The open side of the air guide groove (214) is connected to the wind cavity (213). One end of several air outlets (215) is connected to the air guide groove (214). The diameter of the air outlets (215) is no more than 2 mm.

4. The needle bed drive structure with improved motion accuracy according to claim 3, characterized in that: The cam assembly (2) is also provided with an end plate (22), which is an annular plate with an outwardly extending protrusion on one side and a fixed connection to the cam body (21) on the other side. The transmission shaft of the transmission assembly (1) passes through the cam body (21) and the end plate (22) and is fixedly connected to the cam body (21).

5. The needle bed drive structure with improved motion accuracy according to claim 4, characterized in that: The upper roller (31) of the roller assembly (3) is positioned above the lower roller (32). The roller assembly (3) is also provided with a roller frame (33) and a support shaft (34). The upper roller (31) and the lower roller (32) are connected to the roller frame (33) by their respective spindles, and the wheel bodies of the upper roller (31) and the lower roller (32) are rotatable. The roller frame (33) is rotatably connected to the support shaft (34).

6. The needle bed drive structure with improved motion accuracy according to claim 5, characterized in that: The connecting rod assembly (4) is provided with a connecting rod and a Y-shaped hinge joint fixed to the lower end of the connecting rod. The Y-shaped hinge joint is hinged to the spindle provided on the upper roller (31).

7. The needle bed drive structure with improved motion accuracy according to claim 6, characterized in that: The air supply assembly (5) is provided with an air inlet plate (51) and an air inlet connector (52). The air inlet plate (51) has an inwardly recessed groove on one side. The air inlet plate (51) has an L-shaped air inlet hole (511) inside. One end of the air inlet hole (511) is exposed, and the other end is connected to the groove of the air inlet plate (51). One end of the air inlet connector (52) is connected to the exposed end of the air inlet hole (511). The protruding edge of the end plate (22) of the cam assembly (2) can be embedded into the groove of the air inlet plate (51) and can rotate in the groove. The air inlet plate (51) is fixedly set. The transmission shaft of the transmission assembly (1) moves through the air inlet plate (51).

8. The needle bed drive structure with improved motion accuracy according to claim 7, characterized in that: The cleaning assembly (6) includes a cleaning shovel (61), a sliding sleeve (62), a spring (63), and a retaining ring (64). The upper end of the cleaning shovel (61) is fixed to the sliding sleeve (62), and the sliding sleeve (62) is slidably connected to the connecting rod of the linkage assembly (4). There are two springs (63) and two retaining rings (64). The two springs (63) are movably sleeved on the connecting rod of the linkage assembly (4) and are placed at both ends of the sliding sleeve (62). The two retaining rings (64) are fixed to the connecting rod of the linkage assembly (4) and are placed at the upper and lower ends of the two springs (63).

9. The needle bed drive structure with improved motion accuracy according to claim 8, characterized in that: The cleaning shovel (61) is a shovel-shaped cavity component with a dust collection air duct (611) inside and an open bottom. The lower part of the cleaning shovel (61) is inclined and increases in width while gradually thinning in thickness to form a scraping surface (612).

10. The needle bed drive structure with improved motion accuracy according to claim 9, characterized in that: The cleaning assembly (6) also includes an exhaust connector (65), one end of which is connected to the cleaning shovel (61) and communicates with the dust collection duct (611) of the cleaning shovel (61).

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