A tension detection device for knitted sweater production

Abstract

The present invention discloses a tension detection device for knitted sweater production, comprising a bottom plate, a support leg fixedly connected to the lower side of the bottom plate, an electric push rod fixedly connected to the upper side of the bottom plate, a lifting plate fixedly connected to the upper end of the electric push rod, a pressure sensor fixedly connected to the upper side of the lifting plate, a top roller fixedly connected to the upper side of the pressure sensor, fixed rods fixedly connected to the upper sides of the left and right ends of the bottom plate, and limiting units are provided at the upper ends of the fixed rods on the left and right sides, the limiting units include a U-shaped frame, and the U-shaped frame is fixedly connected to the upper end of the fixed rod. The present invention relates to the field of tension detection technology. The tension detection device for knitted sweater production is convenient for double limiting before yarn tension detection by arranging a pressure plate, a contact plate, a fixed plate and limiting rollers on both sides on the U-shaped frame, so as to avoid the yarn from sliding from the clamping point and affecting the accuracy of tension detection.

Description

Technical Field

[0001] The invention relates to the technical field of tension detection, in particular to a tension detection device for knitted sweater production. Background Art

[0002] Sweaters are a type of clothing made of knitted fabrics, usually used to make casual or sportswear. Knitted fabrics are made up of a series of interwoven coils that can form a variety of patterns and structures. The production process of sweaters involves knitting yarn into fabric through a knitting machine or by hand, and then cutting and sewing the fabric into the shape of the garment. During the production of sweaters, tension detection devices are required to perform tension detection to ensure the production quality of sweaters.

[0003] When performing tension testing, both ends of the yarn used in sweaters need to be fixed, and the tension of the yarn is tested by moving the top roller up and down. The yarn is prone to slip at the clamping point, resulting in deviations in the measured value. When the yarn is limited, it shifts and is not placed level, making the tension test inaccurate. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a tension detection device for knitted sweater production, which solves the problems of poor yarn clamping effect, slippage at the clamping point, and large measurement deviation.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A tension detection device for knitwear production, comprising a bottom plate, a support leg fixedly connected to the lower side of the bottom plate, an electric push rod fixedly connected to the upper side of the bottom plate, a lifting plate fixedly connected to the upper end of the electric push rod, a pressure sensor fixedly connected to the upper side of the lifting plate, a top roller fixedly connected to the upper side of the pressure sensor, fixed rods fixedly connected to the upper sides of the left and right ends of the bottom plate, and limited position units are provided on the upper ends of the fixed rods on the left and right sides;

[0007] The upper side of the slides on the front and rear sides are fixedly connected to the U-shaped plate, and the upper sides of the slides on the front and rear sides are fixedly connected to the U-shaped plate, and the U-shaped plate is fixedly connected to a limiting roller 1 on one side of the U-shaped plate close to the U-shaped frame.

[0008] Preferably, the lower sides of the left and right ends of the front skateboard are rotatably connected to rotating plate 2, and the lower sides of the left and right ends of the rear skateboard are rotatably connected to rotating plate 1. A rectangular groove is provided on the front side of rotating plate 1, and rotating plate 1 is rotatably connected to the rectangular groove. A moving block is fixedly connected to the lower side of the front skateboard, and an electric push rod 2 is fixedly connected to the front side of the moving block, and the electric push rod 2 is fixedly connected to the fixed plate.

[0009] Preferably, an L-shaped plate is fixedly connected to the lower side of the fixed plate, a fixed frame is fixedly connected to the front side of the L-shaped plate, an air cylinder is fixedly connected to the inner side of the fixed frame, a piston disk is provided on the inner side of the air cylinder, a bottom block is fixedly connected to the lower side of the movable block, a control rod is fixedly connected between the bottom block and the piston disk, a fixed box is fixedly connected to the inside of the lower side of the U-shaped frame, two air bags are fixedly connected to the inner side of the fixed box, a U-shaped tube is fixedly connected between the two air bags, and a connecting tube is fixedly connected between the U-shaped tube and the air cylinder.

[0010] Preferably, the outer side of the U-shaped frame and the outer side of the fixing box are both provided with perforations.

[0011] Preferably, a lifting groove is provided on the rear side of the U-shaped plate on the front side, and lifting blocks are slidably connected to the inner sides of the upper and lower ends of the lifting groove, and mounting frames are fixedly connected to the rear sides of the lifting blocks on the upper and lower sides, and limiting rollers are fixedly connected to the outer side of the mounting frame, and a side plate is fixedly connected to the side of the fixed plate away from the U-shaped frame, and two movable grooves are provided on the outer side of the side plate, and inclined grooves are provided on the outer sides of the two side plates and at the rear ends of the movable grooves, and a sliding rod is slidably connected to the inner side of the movable groove, and a connecting block is fixedly connected between the sliding rod and the lifting block.

[0012] Preferably, the two inclined grooves are symmetrically arranged, and the sliding rod is slidably connected to the inclined grooves.

[0013] Preferably, a gear is fixedly connected to the outer side of the front end of the rotating rod, a guide plate and a mounting block are fixedly connected to the upper inner wall of the U-shaped frame, the outer side of the guide plate is slidably connected to the guide block, the upper side of the guide block is fixedly connected to a toothed plate, a side of the mounting block close to the guide plate is fixedly connected to a second pressure sensor, and the upper side of the U-shaped frame is fixedly connected to an alarm light.

[0014] Preferably, the gear is meshingly connected to a toothed plate.

[0015] The present invention provides a tension detection device for knitted sweater production. Compared with the prior art, it has the following beneficial effects:

[0016] (1) The tension detection device for knitted sweater production is provided with a pressure plate, a contact plate, a fixed plate and limit rollers on both sides on a U-shaped frame, so as to facilitate double limiting before yarn tension detection, thereby preventing the yarn from sliding from the clamping point and affecting the accuracy of tension detection.

[0017] (2) The tension detection device for knitted sweater production facilitates yarn deviation correction by bringing the limiting rollers on the fixed plate closer to each other, thereby avoiding the yarn being offset and affecting the detection result.

[0018] (3) The tension detection device for knitted sweater production uses an air bag on a fixed box and an air cylinder on a fixed plate to facilitate the air bag to clamp the yarn, and uses limiting rollers on the upper and lower sides to clamp and limit the yarn again, so that the yarn is not easy to slide during tension detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall three-dimensional structure diagram of the present invention;

[0020] Figure 2 It is a three-dimensional structural diagram of the limiting unit in the present invention;

[0021] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 It is a partial three-dimensional structural diagram of the limiting unit in the present invention;

[0023] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0024] Figure 6 It is a partial cross-sectional three-dimensional structural diagram of the limiting unit in the present invention;

[0025] Figure 7 It is a three-dimensional structural diagram of the fixing plate of the limiting unit in the present invention;

[0026] Figure 8 It is a three-dimensional structural diagram of the U-shaped plate in the present invention;

[0027] Fig. 9 This is a three-dimensional structural diagram of the U-shaped plate in the present invention from another perspective.

[0028] In the figure: 1, bottom plate; 2, supporting leg; 3, electric push rod 1; 4, lifting plate; 5, pressure sensor 1; 6, top roller; 7, fixed rod; 8, limit unit; 801, U-shaped frame; 802, rear plate; 803, alarm light; 804, perforation; 805, hydraulic cylinder; 806, pressure plate; 807, mounting rod; 808, contact plate; 809, slot; 810, fixing box; 811, rotating rod; 812, rotating roller; 813, gear; 814, guide plate; 815, tooth plate; 816, mounting block; 817, pressure sensor 2; 818, fixed plate; 819, slideway; 820, slide plate ;821, rotating plate one;822, rectangular groove;823, electric push rod two;824, moving block;825, bottom block;826, control rod;827, air cylinder;828, connecting pipe;829, fixing frame;830, L-shaped plate;831, piston disc;832, air bag;833, U-shaped tube;834, U-shaped plate;835, limiting roller one;836, lifting groove;837, lifting block;838, connecting block;839, side plate;840, moving groove;841, inclined groove;842, sliding rod;843, mounting frame;844, limiting roller two;845, guide block;846, rotating plate two. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0030] See also Figure 1 - Figure 7 The present invention provides a technical solution: a tension detection device for knitted sweater production, comprising a bottom plate 1, a supporting leg 2 is fixedly connected to the lower side of the bottom plate 1, an electric push rod 3 is fixedly connected to the upper side of the bottom plate 1, a lifting plate 4 is fixedly connected to the upper end of the electric push rod 3, a pressure sensor 5 is fixedly connected to the upper side of the lifting plate 4, a top roller 6 is fixedly connected to the upper side of the pressure sensor 5, fixed rods 7 are fixedly connected to the upper sides of the left and right ends of the bottom plate 1, and limiting units 8 are arranged on the upper ends of the fixed rods 7 on the left and right sides. When the tension of the yarn used for the production of the knitted sweater is detected, the two ends of the yarn are first limited by the limiting units 8, and then the electric push rod 3 is controlled to drive the lifting plate 4 to rise, and the lifting plate 4 drives the top roller 6 to lift the upper yarn, and the tension is detected by the pressure sensor 5.

[0031] The limiting unit 8 includes a U-shaped frame 801, which is fixedly connected to the upper end of the fixed rod 7, a rear plate 802 is fixedly connected to the rear side of the U-shaped frame 801, a hydraulic cylinder 805 is fixedly connected to the upper side of the U-shaped frame 801, and a pressure plate 806 is fixedly connected to the output end of the lower side of the hydraulic cylinder 805, a mounting rod 807 is fixedly connected to the upper inner wall of the U-shaped frame 801, and a contact plate 808 is fixedly connected to the upper end of the mounting rod 807, and a card slot 809 is provided on the outer sides of the contact plate 808 and the pressure plate 806, and the front side of the rear plate 802 is rotatably connected to The rotating rod 811 has a rotating roller 812 fixedly connected to the outer side of the rotating rod 811, a fixed plate 818 fixedly connected to the lower side of the U-shaped frame 801, a slide groove 819 is provided on the upper side of the fixed plate 818, and a slide plate 820 is slidably connected to the inner side of the front and rear ends of the slide groove 819, and the upper sides of the front and rear slide plates 820 are fixedly connected to the U-shaped plate 834, and the side of the U-shaped plate 834 close to the U-shaped frame 801 is fixedly connected to the limiting roller 1 835, and the lower sides of the left and right ends of the front slide plate 820 are rotatably connected to the rotating plate 2 846, and the left and right sides of the rear slide plate 820 are fixedly connected to the U-shaped plate 834. The lower sides of both ends are rotatably connected to the rotating plate 821, and a rectangular groove 822 is provided on the front side of the rotating plate 821. The rotating plate 821 is rotatably connected to the rectangular groove 822. The lower side of the front slide 820 is fixedly connected to a moving block 824, and the front side of the moving block 824 is fixedly connected to an electric push rod 823. The electric push rod 823 is fixedly connected to the fixed plate 818. Before use, the two ends of the yarn are placed on the contact plate 808, and then the hydraulic cylinder 805 is controlled to drive the pressing plate 806 to descend, so that the pressing plate 806 performs preliminary positioning on the two ends of the yarn. , and then control the electric push rod 823 to push the moving block 824 to move, the moving block 824 drives the slide plate 820 to move, the slide plate 820 drives the rotating plate 846 to rotate, the rotating plate 846 drives the rotating plate 821 to rotate, so that the slide plates 820 on the front and rear sides are close to each other, the slide plate 820 drives the U-shaped plate 834 to move, the U-shaped plate 834 drives the limiting roller 835 to approach each other, so that the limiting rollers 835 on the front and rear sides limit the yarn and correct the yarn at the same time to avoid yarn installation deviation, increase the stability of yarn clamping, and avoid sliding. Embodiment 2

[0032] See also Figure 1 - Fig. 9The present invention provides a technical solution: a tension detection device for knitted sweater production, comprising a bottom plate 1, a supporting leg 2 is fixedly connected to the lower side of the bottom plate 1, an electric push rod 3 is fixedly connected to the upper side of the bottom plate 1, a lifting plate 4 is fixedly connected to the upper end of the electric push rod 3, a pressure sensor 5 is fixedly connected to the upper side of the lifting plate 4, a top roller 6 is fixedly connected to the upper side of the pressure sensor 5, fixed rods 7 are fixedly connected to the upper sides of the left and right ends of the bottom plate 1, and limiting units 8 are arranged on the upper ends of the fixed rods 7 on the left and right sides. When the tension of the yarn used for the production of the knitted sweater is detected, the two ends of the yarn are first limited by the limiting units 8, and then the electric push rod 3 is controlled to drive the lifting plate 4 to rise, and the lifting plate 4 drives the top roller 6 to lift the upper yarn, and the tension is detected by the pressure sensor 5.

[0033] The limiting unit 8 includes a U-shaped frame 801, which is fixedly connected to the upper end of the fixed rod 7, a rear plate 802 is fixedly connected to the rear side of the U-shaped frame 801, a hydraulic cylinder 805 is fixedly connected to the upper side of the U-shaped frame 801, and a pressure plate 806 is fixedly connected to the output end of the lower side of the hydraulic cylinder 805, a mounting rod 807 is fixedly connected to the upper inner wall of the U-shaped frame 801, and a contact plate 808 is fixedly connected to the upper end of the mounting rod 807, and a card slot 809 is provided on the outer sides of the contact plate 808 and the pressure plate 806, and the front side of the rear plate 802 is rotatably connected to The rotating rod 811 has a rotating roller 812 fixedly connected to the outer side of the rotating rod 811, a fixed plate 818 fixedly connected to the lower side of the U-shaped frame 801, a slide groove 819 is provided on the upper side of the fixed plate 818, and a slide plate 820 is slidably connected to the inner side of the front and rear ends of the slide groove 819, and the upper sides of the front and rear slide plates 820 are fixedly connected to the U-shaped plate 834, and the side of the U-shaped plate 834 close to the U-shaped frame 801 is fixedly connected to the limiting roller 1 835, and the lower sides of the left and right ends of the front slide plate 820 are rotatably connected to the rotating plate 2 846, and the left and right sides of the rear slide plate 820 are fixedly connected to the U-shaped plate 834. The lower sides of both ends are rotatably connected to the rotating plate 821, and a rectangular groove 822 is provided on the front side of the rotating plate 821. The rotating plate 821 is rotatably connected to the rectangular groove 822. The lower side of the front slide 820 is fixedly connected to a moving block 824, and the front side of the moving block 824 is fixedly connected to an electric push rod 823. The electric push rod 823 is fixedly connected to the fixed plate 818. Before use, the two ends of the yarn are placed on the contact plate 808, and then the hydraulic cylinder 805 is controlled to drive the pressing plate 806 to descend, so that the pressing plate 806 performs preliminary positioning on the two ends of the yarn. , and then control the electric push rod 823 to push the moving block 824 to move, the moving block 824 drives the slide plate 820 to move, the slide plate 820 drives the rotating plate 846 to rotate, the rotating plate 846 drives the rotating plate 821 to rotate, so that the slide plates 820 on the front and rear sides are close to each other, the slide plate 820 drives the U-shaped plate 834 to move, the U-shaped plate 834 drives the limiting roller 835 to approach each other, so that the limiting rollers 835 on the front and rear sides limit the yarn and correct the yarn at the same time to avoid yarn installation deviation, increase the stability of yarn clamping, and avoid sliding.

[0034] The lower side of the fixed plate 818 is fixedly connected to an L-shaped plate 830, the front side of the L-shaped plate 830 is fixedly connected to a fixed frame 829, the inner side of the fixed frame 829 is fixedly connected to an air cylinder 827, the inner side of the air cylinder 827 is provided with a piston disc 831, the lower side of the moving block 824 is fixedly connected to a bottom block 825, a control rod 826 is fixedly connected between the bottom block 825 and the piston disc 831, the lower side of the U-shaped frame 801 is fixedly connected to a fixed box 810, the inner side of the fixed box 810 is fixedly connected to two air bags 832, a U-shaped tube 833 is fixedly connected between the two air bags 832, a connecting tube 828 is fixedly connected between the U-shaped tube 833 and the air cylinder 827, and the U-shaped The outer side of the frame 801 and the outer side of the fixed box 810 are both provided with a perforation 804, and the perforation 804 facilitates one end of the yarn to pass through the fixed box 810 and the U-shaped frame 801. When the limiting roller 835 limits the yarn, the electric push rod 823 drives the bottom block 825 on the moving block 824 to move backward, and the bottom block 825 drives the control rod 826 to move backward, and the control rod 826 drives the piston plate 831 to move backward, so that the gas in the air cylinder 827 is pushed out and distributed to the two air bags 832 through the connecting tube 828 and the U-shaped tube 833, so that the two air bags 832 are expanded at the same time, and the expanded air bags 832 are close to the yarn, so that the two air bags 832 limit the yarn, thereby increasing the clamping effect.

[0035] A lifting groove 836 is provided on the rear side of the front U-shaped plate 834, and lifting blocks 837 are slidably connected to the inner sides of the upper and lower ends of the lifting groove 836, and the rear sides of the upper and lower lifting blocks 837 are fixedly connected to mounting frames 843, and the outer side of the mounting frames 843 is fixedly connected to the limiting roller 844, and the side of the fixed plate 818 away from the U-shaped frame 801 is fixedly connected to the side plate 839, and two moving grooves 840 are provided on the outer side of the side plate 839, and inclined grooves 841 are provided on the outer sides of the two side plates 839 and at the rear ends of the moving grooves 840, and the inner side of the moving grooves 840 is slidably connected to the sliding rod 842, and the sliding rod 842 and the lifting block 837 are fixedly connected to the connecting rod. The connecting block 838 and the two inclined grooves 841 are symmetrically arranged, and the slide bar 842 is slidably connected with the inclined groove 841. When the U-shaped plate 834 drives the limiting roller 1 835 to move, the front U-shaped plate 834 drives the limiting roller 2 844 to approach the yarn, and the limiting roller 2 844 drives the slide bar 842 on the connecting block 838 to move backward inside the moving groove 840. When the slide bar 842 moves to the position of the inclined groove 841, the limiting roller 2 844 on the lifting block 837 is controlled to move up and down. Since the two inclined grooves 841 are symmetrical, the upper and lower sides move backward and approach each other, so that the limiting rollers 2 844 on the upper and lower sides limit the yarn again, thereby increasing the clamping effect and preventing the yarn from sliding. Embodiment 3

[0036] like Figure 2 , Figure 3As shown, the outer side of the front end of the rotating rod 811 is fixedly connected with a gear 813, the upper inner wall of the U-shaped frame 801 is fixedly connected with a guide plate 814 and a mounting block 816, the outer side of the guide plate 814 is slidably connected with a guide block 845, the upper side of the guide block 845 is fixedly connected with a tooth plate 815, the side of the mounting block 816 close to the guide plate 814 is fixedly connected with a pressure sensor 817, the upper side of the U-shaped frame 801 is fixedly connected with an alarm light 803, the gear 813 is meshed with the tooth plate 815, and a PLC controller is arranged on the outer side of the device, P The LC controller is connected to the pressure sensor 817 and the alarm light 803. When the yarn slips during the tension detection, the friction between the sand wire and the roller 812 causes the yarn to drive the roller 812 to rotate, and the roller 812 drives the rotating rod 811 to rotate, and the rotating rod 811 drives the gear 813 to rotate, and the gear 813 drives the tooth plate 815 to move. When the tooth plate 815 contacts the pressure sensor 817, a pressure signal is generated. Under the action of the PLC controller, the alarm light 803 is activated to remind the staff that the yarn is slipping.

[0037] Working principle: Before testing, first place the two ends of the yarn on the upper side of the left and right contact plates 808, and control the hydraulic cylinder 805 to drive the pressure plate 806 to press down the sand line for preliminary limit, then control the electric push rod 823 to drive the slide plate 820 to move, and under the action of the rotating plate 1 821 and the rotating plate 2 846, the limit rollers 1 835 on the front and rear sides are brought close to each other, so that the limit rollers 1 835 again limit and clamp the yarn, and correct the deviation, and at the same time the electric push rod 823 drives the piston plate 831 to move back. When the limiting roller 835 moves, under the action of the air cylinder 827, the connecting tube 828 and the U-shaped tube 833, the two air bags 832 are expanded to facilitate the air bags 832 to clamp the yarn. When the limiting roller 835 moves, under the action of the side plate 839, the movable groove 840, the inclined groove 841, the slide bar 842 and the connecting block 838, the limiting rollers 844 on the upper and lower sides clamp and limit the yarn again to prevent the yarn from sliding. When the tension is detected, the electric push rod 3 is controlled to drive the top roller 6 to rise to detect the tension of the yarn.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tension detection device for knitwear production, comprising a bottom plate (1), a support leg (2) fixedly connected to the bottom side of the bottom plate (1), an electric push rod (3) fixedly connected to the top side of the bottom plate (1), a lifting plate (4) fixedly connected to the upper end of the electric push rod (3), a pressure sensor (5) fixedly connected to the top side of the lifting plate (4), and a top roller (6) fixedly connected to the top side of the pressure sensor (5), characterized in that: The upper sides of the left and right ends of the bottom plate (1) are fixedly connected to fixing rods (7), and the upper ends of the fixing rods (7) on the left and right sides are provided with limiting units (8); The limiting unit (8) comprises a U-shaped frame (801), wherein the U-shaped frame (801) is fixedly connected to the upper end of the fixing rod (7), a rear plate (802) is fixedly connected to the rear side of the U-shaped frame (801), a hydraulic cylinder (805) is fixedly connected to the upper side of the U-shaped frame (801), a pressure plate (806) is fixedly connected to the output end of the lower side of the hydraulic cylinder (805), a mounting rod (807) is fixedly connected to the upper inner wall of the U-shaped frame (801), a contact plate (808) is fixedly connected to the upper end of the mounting rod (807), and the contact plate (808) and the pressure plate (806) are both provided with a card slot on the outer side. The rear plate (802) is rotatably connected to a rotating rod (811) at the front side, a rotating roller (812) is fixedly connected to the outer side of the rotating rod (811), a fixed plate (818) is fixedly connected to the lower side of the U-shaped frame (801), a sliding groove (819) is provided on the upper side of the fixed plate (818), a sliding plate (820) is slidably connected to the inner sides of the front and rear ends of the sliding groove (819), the upper sides of the sliding plates (820) at the front and rear sides are fixedly connected to U-shaped plates (834), and a limiting roller (835) is fixedly connected to the side of the U-shaped plate (834) close to the U-shaped frame (801).

2. A tension detection device for knitted sweater production according to claim 1, characterized in that: The lower sides of the left and right ends of the front side slide plate (820) are both rotatably connected to a rotating plate 2 (846), and the lower sides of the left and right ends of the rear side slide plate (820) are both rotatably connected to a rotating plate 1 (821). A rectangular groove (822) is provided on the front side of the rotating plate 1 (821), and the rotating plate 1 (821) is rotatably connected to the rectangular groove (822). The lower side of the front side slide plate (820) is fixedly connected to a moving block (824), and the front side of the moving block (824) is fixedly connected to an electric push rod 2 (823), and the electric push rod 2 (823) is fixedly connected to the fixed plate (818).

3. A tension detection device for knitwear production according to claim 2, characterized in that: The lower side of the fixed plate (818) is fixedly connected to an L-shaped plate (830), the front side of the L-shaped plate (830) is fixedly connected to a fixed frame (829), the inner side of the fixed frame (829) is fixedly connected to an air cylinder (827), the inner side of the air cylinder (827) is provided with a piston disc (831), the lower side of the moving block (824) is fixedly connected to a bottom block (825), a control rod (826) is fixedly connected between the bottom block (825) and the piston disc (831), the lower side of the U-shaped frame (801) is fixedly connected to a fixed box (810), the inner side of the fixed box (810) is fixedly connected to two air bags (832), a U-shaped tube (833) is fixedly connected between the two air bags (832), and a connecting tube (828) is fixedly connected between the U-shaped tube (833) and the air cylinder (827).

4. A tension detection device for knitted sweater production according to claim 3, characterized in that: The outer side of the U-shaped frame (801) and the outer side of the fixing box (810) are both provided with perforations (804).

5. The tension detection device for knitted sweater production according to claim 1, characterized in that: A lifting groove (836) is provided on the rear side of the U-shaped plate (834) at the front side, and lifting blocks (837) are slidably connected to the inner sides of the upper and lower ends of the lifting groove (836), and the rear sides of the lifting blocks (837) at the upper and lower sides are fixedly connected to mounting frames (843), and the outer side of the mounting frame (843) is fixedly connected to a second limiting roller (844), and the fixed plate (818) is fixedly connected to a side plate (839) on the side away from the U-shaped frame (801), and two movable grooves (840) are provided on the outer side of the side plate (839), and oblique grooves (841) are provided on the outer sides of the two side plates (839) and at the rear ends of the movable grooves (840), and a sliding rod (842) is slidably connected to the inner side of the movable groove (840), and a connecting block (838) is fixedly connected between the sliding rod (842) and the lifting block (837).

6. A tension detection device for knitted sweater production according to claim 5, characterized in that: The two inclined grooves (841) are symmetrically arranged, and the sliding rod (842) is slidably connected to the inclined grooves (841).

7. The tension detection device for knitted sweater production according to claim 1, characterized in that: The outer side of the front end of the rotating rod (811) is fixedly connected to a gear (813); the upper inner wall of the U-shaped frame (801) is fixedly connected to a guide plate (814) and a mounting block (816); the outer side of the guide plate (814) is slidably connected to a guide block (845); the upper side of the guide block (845) is fixedly connected to a toothed plate (815); a side of the mounting block (816) close to the guide plate (814) is fixedly connected to a second pressure sensor (817); and the upper side of the U-shaped frame (801) is fixedly connected to an alarm light (803).

8. A tension detection device for knitted sweater production according to claim 7, characterized in that: The gear (813) is meshingly connected with the toothed plate (815).

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