Traction device of stenter

Abstract

The utility model discloses a traction device of a stenter. Comprising a rack, a U-shaped plate fixed to the rack, a pair of parallel driven guide rollers with the two ends rotationally connected with the two inner side walls of the U-shaped plate correspondingly, and a hollow traction roller located between the two driven guide rollers in parallel and with the two ends rotationally connected with the two inner side walls of the U-shaped plate correspondingly. The telescopic holes are formed in the outer side wall of the hollow traction roller and evenly formed in the side face of the hollow traction roller, the telescopic needles stretch out and draw back in the telescopic holes in a sliding mode, the telescopic assemblies control the telescopic needles to stretch out of and draw back into the telescopic holes, and the rotating assembly drives the hollow traction roller to rotate. The outer wall of the hollow traction roller is provided with a plurality of rows of parallel and spaced telescopic holes, the telescopic holes in each row uniformly surround the axis of the hollow traction roller, and the axes of the telescopic holes are perpendicular to the axis of the hollow traction roller. The utility model has the following advantages and effects: the utility model has the effects of strong applicability and small occupied space.

Description

Technical Field

[0001] The utility model relates to the technical field of textile equipment, in particular to a traction device of a tenter frame. Background Art

[0002] During the production process of printing and dyeing enterprises in the textile industry, the surface of the cloth will be wrinkled and uneven after printing, dyeing and washing, and must be dried and shaped. When the cloth is shaped by steam, it is necessary to first use the expansion roller in the stenter setting machine to unfold the cloth, and then convey it through two conveyor chains located on the sides of the cloth, and fix the edge of the cloth through the needle plate of the conveyor chain, and insert the needles on the needle plate into the cloth to fix the cloth and perform fixed width traction. However, the distance between the conveyor chains on both sides of the existing stenter setting machine frame is fixed, and the width of the processed cloth is fixed, which cannot adapt to cloth of different widths. At the same time, the conveyor chain is long and the number of needle plates is large, resulting in a large overall size of the stenter machine and a large space occupied. Utility Model Content

[0003] The utility model aims to provide a tenter frame traction device, which has the effects of strong applicability and small occupied space.

[0004] The above-mentioned technical purpose of the utility model is achieved through the following technical scheme: a tenter traction device, comprising a frame, a U-shaped plate fixed on the frame, a pair of driven guide rollers parallel to each other and rotatably connected to the two inner side walls of the U-shaped plate at both ends, a hollow traction roller located parallel to the two driven guide rollers and rotatably connected to the two inner side walls of the U-shaped plate at both ends, a plurality of telescopic holes opened on the outer side wall of the hollow traction roller and evenly arranged on its side, a telescopic needle slidingly telescopic in the telescopic hole, a telescopic assembly for controlling the telescopic needle to extend and retract into the telescopic hole, and a rotating assembly for driving the hollow traction roller to rotate, the diameter of the hollow traction roller is larger than that of the driven guide roller, and the axes of the two are located on the same horizontal reference plane, the outer wall of the hollow traction roller is provided with a plurality of rows of parallel and spaced telescopic holes, and the telescopic holes in each row evenly surround the axis of the hollow traction roller, and the axis of the telescopic hole and the axis of the hollow traction roller are perpendicular to each other.

[0005] The utility model is further configured as follows: the telescopic needle comprises a needle body and a circular needle seat, the circular needle seat slides in the telescopic hole, and the outer diameter of the needle seat is consistent with the inner diameter of the telescopic hole, the needle body is fixed on the circular needle seat, and the outer diameter of the needle body is smaller than the outer diameter of the circular needle seat, a limiting retaining ring is fixedly provided at the opening of the telescopic hole, and the inner diameter of the limiting retaining ring is consistent with the inner diameter of the needle body.

[0006] The utility model is further configured as follows: the rotating assembly includes a driven gear fixedly mounted on one end of the hollow traction roller, a worm gear reduction motor fixedly mounted on the side wall of the U-shaped plate, and a driving gear fixedly connected to the output end of the worm gear reduction motor and meshing with the driven gear.

[0007] The utility model is further configured as follows: a support hole is provided on an inner side wall of the U-shaped plate for rotatably inserting one end of a hollow traction roller, a groove for accommodating a driven gear and a driving gear is provided on the other side of the U-shaped plate, a cover plate is screwed to the opening of the groove on the U-shaped plate, the other end of the hollow traction roller rotates through the cover plate and extends into the groove to connect with the driven gear, the worm gear reduction motor is fixed on the outer side wall of the U-shaped plate, and the output end rotates through the groove to connect with the driving gear.

[0008] The utility model is further configured as follows: the telescopic assembly includes a pair of sliding cylinders that slide inside the hollow traction roller and are pointed at both ends and thick in the middle, a pair of cylinders that respectively drive the two sliding cylinders to slide along the inside of the hollow traction roller, a through hole opened at the bottom of the telescopic hole and connected to the inside of the hollow traction roller, a push rod fixed to the bottom of the circular needle seat and passing through the through hole, and a spring that is sleeved on the needle body and whose two ends are respectively close to the limit retaining ring and the needle seat; the outer diameter of the push rod and the inner diameter of the through hole are smaller than the inner diameter of the telescopic hole, and the lower end of the push rod slides in contact with the side of the sliding cylinder; the length of the sliding cylinder does not exceed the spacing between four adjacent telescopic holes, and the maximum outer diameter of the sliding cylinder is smaller than the inner diameter of the hollow traction roller; the two cylinders are symmetrically fixed on the two outer side walls of the U-shaped plate, and the piston rod of the cylinder passes through the side wall of the U-shaped plate and the end of the hollow traction roller in turn, and extends into the inside of the hollow traction roller to rotatably connect the sliding cylinder.

[0009] The utility model is further configured as follows: a plurality of limiting grooves are provided on the side of the sliding cylinder for the push rods to extend into and slide in contact with each other.

[0010] The utility model is further configured as follows: a hemispherical contact head is fixed to the lower end of the push rod.

[0011] The utility model is further configured as follows: a connecting hole is provided at one end of the sliding cylinder, a connecting column inserted into the connecting hole is fixedly provided at one end of the cylinder piston rod, the inner diameter of the connecting hole is consistent with the outer diameter of the connecting column, and the outer diameter of the connecting column or the inner diameter of the connecting hole is larger than the outer diameter of the cylinder piston rod, a limiting retaining ring 2 is fixedly provided at the opening of the connecting hole of the sliding cylinder, and the inner diameter of the limiting retaining ring 2 is consistent with the outer diameter of the cylinder piston rod.

[0012] The utility model is further configured as follows: the U-shaped plate is located above the hollow traction roller and a needle grinding assembly is arranged, the needle grinding assembly includes a support plate fixed to the top of the U-shaped plate and located parallel to the hollow traction roller, a pair of cylinders 2 fixedly installed on the top of the support plate and with piston rods passing through the support plate, a grinding plate located horizontally below the support plate and connecting the piston rods of the two cylinders 2, and a plurality of grinding grooves opened at the bottom of the grinding plate and corresponding to each row of telescopic holes on the side of the hollow traction roller.

[0013] The utility model is further configured as follows: the upper end of the grinding groove is narrow and the lower end is wide.

[0014] The beneficial effect of the utility model is that by adopting the above technical scheme, when it is necessary to pull cloths of different widths, firstly, the cloth is passed above the gap between the hollow pulling roller and a driven guide roller, and then passed downward, and then it is passed from the bottom of the hollow pulling roller to the bottom of the gap between it and another driven guide roller, and then passed upward to ensure that the cloth can contact the telescopic hole on the side of the hollow pulling roller, and then the cylinders on both sides of the U-shaped plate will extend or retract the piston rods at the same time, and respectively make the two sliding cylinders of the hollow pulling roller slide relatively close to or away from each other, because the sliding cylinder is a cylinder with pointed ends and thick middle. , and a limiting groove is provided on its side for the contact head of the lower end of the push rod to extend into and slide into contact. Therefore, when the two sliding cylinders move to the bottom of the two rows of telescopic holes with appropriate spacing, the push rod and the needle seat will be used to push the needle bodies in the two rows of telescopic holes out accordingly, and part of the needle bodies will be inserted into the edge of the cloth. After that, the cylinder stops working and the worm gear reduction motor starts to drive the driving gear to mesh with the driven gear. Finally, the driven gear drives the hollow traction roller to rotate, so that a circle of needle bodies on the hollow traction roller continuously pierces the edge of the cloth, thereby achieving the effect of pulling the cloth forward with a fixed width.

[0015] The above-mentioned tenter frame traction device can not only realize the fixed-width traction work of the cloth through a pair of driven guide rollers and a small structure with a hollow traction roller with needles, but also can control the extension of the telescopic needles in the telescopic holes with appropriate spacing on the side of the hollow traction roller through the telescopic component according to the length of the cloth, thereby saving the space occupied by the tenter frame while effectively adapting to cloths of different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of this embodiment;

[0018] Figure 2 is a structural cross-sectional view of this embodiment;

[0019] Figure 3 yes Figure 2 A magnified image of point A;

[0020] In the figure, 1, frame; 2, U-shaped plate; 21, support hole; 22, groove; 23, cover plate; 3, driven guide roller; 4, hollow traction roller; 41, telescopic hole; 42, limit retaining ring 1; 5, telescopic needle; 51, needle body; 52, circular needle seat; 6, rotating assembly; 61, driven gear; 62, worm gear reduction motor; 63, driving gear; 7, telescopic assembly; 71, sliding column; 711, connecting hole; 712, limit retaining ring 2; 713, limit groove; 72, cylinder 1; 721, connecting column; 73, through hole; 74, push rod; 741, contact head; 75, spring; 8, needle grinding assembly; 81, support plate; 82, cylinder 2; 83, grinding plate; 84, grinding groove. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment: A tenter traction device, such as Figure 1-3 As shown, it includes a frame 1, a U-shaped plate 2 fixed on the frame 1, a pair of driven guide rollers 3 which are parallel to each other and whose two ends are rotatably connected to the two inner walls of the U-shaped plate 2, a hollow traction roller 4 which is parallel and located between the two driven guide rollers 3 and whose two ends are rotatably connected to the two inner walls of the U-shaped plate 2, a plurality of telescopic holes 41 which are opened on the outer wall of the hollow traction roller 4 and evenly arranged on its side, a telescopic needle 5 which slides and telescopes in the telescopic hole 41, a telescopic component 7 which controls the telescopic needle 5 to extend and retract into the telescopic hole 41, and a rotating component 6 which drives the hollow traction roller 4 to rotate. The diameter of the hollow traction roller 4 is larger than that of the driven guide roller 3, and the axes of the two are located on the same horizontal reference plane. There are multiple rows of parallel and spaced telescopic holes 41 on the outer wall of the hollow traction roller 4, and the telescopic holes 41 in each row evenly surround the axis of the hollow traction roller 4, and the axis of the telescopic hole 41 and the axis of the hollow traction roller 4 are perpendicular to each other.

[0023] like Figure 3As shown, the telescopic needle 5 includes a needle body 51 and a circular needle seat 52. The circular needle seat 52 slides in the telescopic hole 41, and the outer diameter of the needle seat is consistent with the inner diameter of the telescopic hole 41. The needle body 51 is fixed on the circular needle seat 52, and the outer diameter of the needle body 51 is smaller than the outer diameter of the circular needle seat 52. A limit retaining ring 42 is fixedly provided at the opening of the telescopic hole 41, and the inner diameter of the limit retaining ring 42 is consistent with the inner diameter of the needle body 51. By adopting the above-mentioned telescopic needle 5 and telescopic hole 41 structure, not only can the sliding connection stability of the telescopic needle 5 and the telescopic hole 41 be effectively guaranteed, but also the spring 75 can be conveniently arranged to assist the telescopic needle 5 to automatically retract the telescopic hole 41.

[0024] like Figure 2 As shown, the rotating assembly 6 includes a driven gear 61 fixedly mounted on one end of the hollow traction roller 4, a worm gear reduction motor 62 fixedly mounted on the side wall of the U-shaped plate 2, and a driving gear 63 fixedly connected to the output end of the worm gear reduction motor 62 and meshing with the driven gear 61; a support hole 21 is provided on an inner side wall of the U-shaped plate 2 for one end of the hollow traction roller 4 to be rotatably inserted, and a groove 22 for accommodating the driven gear 61 and the driving gear 63 is provided on the other side of the U-shaped plate 2. A cover plate 23 is screwed to the U-shaped plate 2 at the opening of the groove 22, and the other end of the hollow traction roller 4 rotates through the cover plate 23 and extends into the interior of the groove 22 to connect with the driven gear 61, and the worm gear reduction motor 62 is fixed on the outer side wall of the U-shaped plate 2, and the output end rotates through the interior of the groove 22 to connect with the driving gear 63. By adopting the support hole 21 and the groove 22 structure of the U-shaped plate 2, not only can the hollow traction roller 4 be stably supported for rotation, but also the meshing stability and transmission safety of the driven gear 61 and the driving gear 63 can be effectively guaranteed.

[0025] like Figure 2As shown, the telescopic assembly 7 includes a pair of sliding cylinders 71 that slide inside the hollow traction roller 4 and are pointed at both ends and thick in the middle, a pair of cylinders 72 that respectively drive the two sliding cylinders 71 to slide along the inside of the hollow traction roller 4, a through hole 73 that is opened at the bottom of the telescopic hole 41 and communicates with the inside of the hollow traction roller 4, a push rod 74 that is fixed to the bottom of the circular needle seat 52 and passes through the through hole 73, and a spring 75 that is sleeved on the needle body 51 and has its two ends close to the limit ring and the needle seat; the outer diameter of the push rod 74 is equal to the through hole 73. 3 is smaller than the inner diameter of the telescopic hole 41, and the lower end of the push rod 74 slides and contacts the side of the sliding cylinder 71; the length of the sliding cylinder 71 does not exceed the spacing between four adjacent telescopic holes 41, and the maximum outer diameter of the sliding cylinder 71 is smaller than the inner diameter of the hollow traction roller 4; the two cylinders 1 72 are symmetrically fixed on the two outer side walls of the U-shaped plate 2, and the piston rods of the cylinders 1 72 pass through the side walls of the U-shaped plate 2 and the ends of the hollow traction roller 4 in turn, and extend into the hollow traction roller 4 to rotate and connect the sliding cylinder 71. Among them, the side of the sliding cylinder 71 is provided with a plurality of limiting grooves 713 for each push rod 74 to extend into and slide in contact, and the lower end of the push rod 74 is fixed with a hemispherical contact head 741, which can effectively ensure the stable sliding contact between the sliding cylinder 71 and the push rod 74.

[0026] like Figure 2 As shown, a connecting hole 711 is provided at one end of the sliding cylinder 71, and a connecting column 721 inserted into the connecting hole 711 is fixedly provided at one end of the piston rod of the cylinder 72. The inner diameter of the connecting hole 711 is consistent with the outer diameter of the connecting column 721, and the outer diameter of the connecting column 721 or the inner diameter of the connecting hole 711 is larger than the outer diameter of the piston rod of the cylinder 72. A limiting retaining ring 712 is fixedly provided at the opening of the connecting hole 711 of the sliding cylinder 71, and the inner diameter of the limiting retaining ring 712 is consistent with the outer diameter of the piston rod of the cylinder 72. By adopting the above-mentioned connecting structure of the sliding cylinder 71 and the piston rod of the cylinder 72, it can ensure that the piston rod of the cylinder 72 pulls the sliding cylinder 71 to slide stably relative to the inside of the hollow traction roller 4, and at the same time, it can also avoid the pulling and pushing action of the piston rod of the cylinder 72 and the rotation action of the hollow traction roller 4 and the sliding cylinder 71 from influencing and interfering with each other.

[0027] like Figure 1As shown, the U-shaped plate 2 is located above the hollow traction roller 4 and a needle grinding assembly 8 is provided. The needle grinding assembly 8 includes a support plate 81 fixed to the top of the U-shaped plate 2 and located parallel to the hollow traction roller 4, a pair of cylinders 82 fixedly installed on the top of the support plate 81 and with piston rods passing through the support plate 81, a grinding plate 83 located horizontally below the support plate 81 and connecting the piston rods of the two cylinders 82, and a plurality of grinding grooves 84 opened at the bottom of the grinding plate 83 and corresponding to each row of telescopic holes 41 on the side of the hollow traction roller 4. By adopting the needle tip grinding device, when the needle body 51 needs to be ground, firstly, the air cylinder 2 82 is controlled to drive the grinding plate 83 close to the hollow traction roller 4, and then the telescopic needle 5 of the needle body 51 that needs to be ground is controlled to extend out of the telescopic hole 41 through the telescopic component 7, so that the needle tip of the needle body 51 extends into the grinding groove 84 of the grinding plate 83, and finally the hollow traction roller 4 is driven by the rotating component 6 to achieve the grinding of the needle tip of the needle body 51, so as to ensure the puncture strength of the needle body 51 and extend the service life of the needle body 51. Among them, the grinding groove 84 is narrow at the upper end and wide at the lower end, and the coarseness of the grinding of the needle tip of the needle body 51 can be indirectly changed by adjusting the height of the grinding plate 83 and the hollow traction roller 4, thereby further improving the puncture strength and service life of the telescopic needle 5.

[0028] The working principle of this embodiment:

[0029] When it is necessary to pull cloth of different widths, firstly, the cloth is passed over the gap between the hollow pulling roller 4 and a driven guide roller 3, and then passed downward, and then it is passed from the bottom of the hollow pulling roller 4 to the bottom of the gap between it and the other driven guide roller 3, and then passed upward to ensure that the cloth can contact the telescopic hole 41 on the side of the hollow pulling roller 4, and then the cylinder 72 on both sides of the U-shaped plate 2 will extend or retract the piston rod at the same time, and respectively make the two sliding cylinders 71 of the hollow pulling roller 4 slide relatively close to or away from each other. Since the sliding cylinder 71 is a cylinder with pointed ends and thick middle, and its side is provided with a contact head 741 for the lower end of the push rod 74 The limiting groove 713 extends into and slides in contact with the two sliding cylinders 71. Therefore, when the two sliding cylinders 71 move to the bottom of the two rows of telescopic holes 41 with appropriate spacing, the needle bodies 51 in the two rows of telescopic holes 41 will be pushed out through the push rod 74 and the needle seat accordingly, and part of the needle bodies 51 will be inserted into the edge of the cloth. After that, the cylinder 72 stops working, and the worm gear reduction motor 62 starts to drive the driving gear 63 to engage the driven gear 61. Finally, the driven gear 61 drives the hollow traction roller 4 to rotate, so that a circle of needle bodies 51 on the hollow traction roller 4 continuously pierces the edge of the cloth, thereby achieving the effect of pulling the cloth forward with a fixed width.

[0030] The above-mentioned tenter frame traction device can not only realize the fixed-width traction work of the cloth through a pair of driven guide rollers 3 and a small structure with a hollow traction roller 4 with needles, but also can control the extension of the telescopic needles 5 in the telescopic holes 41 with appropriate spacing on the side of the hollow traction roller 4 through the telescopic component 7 according to the length of the cloth, thereby saving the space occupied by the tenter frame while effectively adapting to cloths of different widths.

Claims

1. A tenter frame traction device, characterized in that: The invention comprises a frame (1), a U-shaped plate (2) fixed on the frame (1), a pair of driven guide rollers (3) which are parallel to each other and whose two ends are respectively rotatably connected to the two inner side walls of the U-shaped plate (2), a hollow traction roller (4) which is located parallel to the two driven guide rollers (3) and whose two ends are respectively rotatably connected to the two inner side walls of the U-shaped plate (2), a plurality of telescopic holes (41) which are opened on the outer side wall of the hollow traction roller (4) and are evenly arranged on the side surface thereof, a telescopic needle (5) which slides and telescopes in the telescopic hole (41), and a control device for controlling the telescopic needle (5) to extend and retract. A telescopic component (7) for extending and retracting the telescopic hole (41), and a rotating component (6) for driving the hollow traction roller (4) to rotate, wherein the diameter of the hollow traction roller (4) is larger than that of the driven guide roller (3), and the axes of the two are located on the same horizontal reference plane, and the outer wall of the hollow traction roller (4) has a plurality of rows of parallel and spaced telescopic holes (41), and the telescopic holes (41) in each row are uniformly arranged around the axis of the hollow traction roller (4), and the axis of the telescopic hole (41) and the axis of the hollow traction roller (4) are perpendicular to each other.

2. A tenter frame pulling device according to claim 1, characterized in that: The telescopic needle (5) comprises a needle body (51) and a circular needle seat (52); the circular needle seat (52) slides in the telescopic hole (41), and the outer diameter of the needle seat is consistent with the inner diameter of the telescopic hole (41); the needle body (51) is fixed on the circular needle seat (52), and the outer diameter of the needle body (51) is smaller than the outer diameter of the circular needle seat (52); a limit stop ring (42) is fixedly provided at the opening of the telescopic hole (41), and the inner diameter of the limit stop ring (42) is consistent with the inner diameter of the needle body (51).

3. The tenter frame pulling device according to claim 1, characterized in that: The rotating assembly (6) comprises a driven gear (61) fixedly mounted on one end of the hollow traction roller (4), a worm gear reduction motor (62) fixedly mounted on the side wall of the U-shaped plate (2), and a driving gear (63) fixedly connected to the output end of the worm gear reduction motor (62) and meshing with the driven gear (61).

4. A tenter frame pulling device according to claim 3, characterized in that: A support hole (21) is provided on an inner side wall of the U-shaped plate (2) for rotatably inserting one end of the hollow traction roller (4), and a groove (22) for accommodating a driven gear (61) and a driving gear (63) is provided on the other side of the U-shaped plate (2). A cover plate (23) is screwed to the opening of the groove (22) of the U-shaped plate (2). The other end of the hollow traction roller (4) rotates through the cover plate (23) and extends into the groove (22) to connect with the driven gear (61). The worm gear reduction motor (62) is fixed on the outer side wall of the U-shaped plate (2), and the output end rotates through the groove (22) to connect with the driving gear (63).

5. The tenter frame pulling device according to claim 3, characterized in that: The telescopic assembly (7) comprises a pair of sliding cylinders (71) which slide inside the hollow traction roller (4) and are pointed at both ends and thick in the middle, a pair of cylinders (72) which respectively drive the two sliding cylinders (71) to slide along the inside of the hollow traction roller (4), a through hole (73) which is opened at the bottom of the telescopic hole (41) and communicates with the inside of the hollow traction roller (4), a push rod (74) which is fixed to the bottom of the circular needle seat (52) and passes through the through hole (73), and a spring (75) which is sleeved on the needle body (51) and has its two ends close to the limit ring and the needle seat respectively; the outer diameter of the push rod (74) and the inner diameter of the through hole (73) are equal to the diameter of the needle body (51). The diameter of the sliding cylinder (71) is smaller than the inner diameter of the telescopic hole (41), and the lower end of the push rod (74) slides in contact with the side surface of the sliding cylinder (71); the length of the sliding cylinder (71) does not exceed the spacing between four adjacent telescopic holes (41), and the maximum outer diameter of the sliding cylinder (71) is smaller than the inner diameter of the hollow traction roller (4); the two cylinders (72) are symmetrically fixed on the two outer side walls of the U-shaped plate (2), respectively, and the piston rods of the cylinders (72) pass through the side walls of the U-shaped plate (2) and the end of the hollow traction roller (4) in sequence, and extend into the interior of the hollow traction roller (4) to rotatably connect with the sliding cylinder (71).

6. A tenter frame pulling device according to claim 5, characterized in that: The side surface of the sliding column (71) is provided with a plurality of limiting grooves (713) for the push rods (74) to extend into and slide into contact with.

7. The tenter frame pulling device according to claim 5, characterized in that: A hemispherical contact head (741) is fixed to the lower end of the push rod (74).

8. The tenter frame pulling device according to claim 5, characterized in that: A connecting hole (711) is formed at one end of the sliding column (71), and a connecting column (721) inserted into the connecting hole (711) is fixedly provided at one end of the piston rod of the cylinder one (72), the inner diameter of the connecting hole (711) is consistent with the outer diameter of the connecting column (721), and the outer diameter of the connecting column (721) or the inner diameter of the connecting hole (711) is greater than the outer diameter of the piston rod of the cylinder one (72), and a limiting retaining ring (712) is fixedly provided at the opening of the connecting hole (711) of the sliding column (71), and the inner diameter of the limiting retaining ring (712) is consistent with the outer diameter of the piston rod of the cylinder one (72).

9. The tenter frame pulling device according to claim 1, characterized in that: The U-shaped plate (2) is located above the hollow traction roller (4) and a needle grinding assembly (8) is arranged thereon. The needle grinding assembly (8) comprises a support plate (81) fixed to the top of the U-shaped plate (2) and located parallel to the top of the hollow traction roller (4), a pair of cylinders (82) fixedly mounted on the top of the support plate (81) and with piston rods passing through the support plate (81), a grinding plate (83) located horizontally below the support plate (81) and connecting the piston rods of the two cylinders (82), and a plurality of grinding grooves (84) opened at the bottom of the grinding plate (83) and corresponding to each row of telescopic holes (41) on the side of the hollow traction roller (4).

10. A tenter frame pulling device according to claim 9, characterized in that: The grinding groove (84) is narrow at the upper end and wide at the lower end.

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