Tension monitoring device

Abstract

The utility model discloses a tension monitoring device. The tension monitoring device comprises a fixed bracket, the tension monitoring roller is movably arranged on the fixed support and can move in the first direction relative to the fixed support, and the first direction is perpendicular to the axis of the tension monitoring roller; the first end of the elastic piece is connected with the fixed support, the second end of the elastic piece is connected with the tension monitoring roller, and the elastic piece is used for providing elastic force in the first direction for the tension monitoring roller; the trigger part is arranged on the downstream side of the tension monitoring roller in the first direction; and the alarm device is electrically connected with the trigger component. In the transmission process of the carbon fiber precursor, when the tension of the carbon fiber precursor is small, the force of the carbon fiber precursor for supporting the bottom of the tension monitoring roller is reduced, and the tension monitoring roller moves downwards to be in contact with the trigger component, so that the alarm device gives an alarm. Whether the tension problem exists in the carbon fiber precursor or not can be timely and accurately determined by judging whether the tension monitoring roller triggers the alarm device or not, and the accuracy of tension monitoring of the carbon fiber precursor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tension monitoring, in particular to a tension monitoring device. Background Art

[0002] In the production process of carbon fiber precursor, the carbon fiber precursor is stretched by a steam drawing machine using high-temperature steam to improve the tension, orientation and other properties of the carbon fiber precursor. When there is a tension problem with the carbon fiber precursor, it will affect the quality of the carbon fiber precursor and reduce the production efficiency of the carbon fiber precursor. In the prior art, in order to monitor the tension of the carbon fiber precursor, the driving current of the steam drawing machine is usually used to monitor whether the carbon fiber precursor has a tension problem. However, there are many factors that affect the driving current. When the driving current is abnormal, it is impossible to immediately determine whether it is caused by the tension problem of the carbon fiber precursor.

[0003] Therefore, how to find a device that can timely and accurately monitor whether there is a tension problem in the carbon fiber precursor is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a tension monitoring device.

[0005] The utility model provides a tension monitoring device, which includes:

[0006] Fixed bracket;

[0007] a tension monitoring roller, movably disposed on the fixed bracket and capable of moving relative to the fixed bracket along a first direction, wherein the first direction is perpendicular to the axis of the tension monitoring roller;

[0008] an elastic member, wherein a first end of the elastic member is connected to the fixed bracket, a second end of the elastic member is connected to the tension monitoring roller, and the elastic member is used to provide an elastic force in the first direction to the tension monitoring roller;

[0009] a trigger component, wherein the trigger component is disposed on a downstream side of the tension monitoring roller in the first direction;

[0010] An alarm device is electrically connected to the trigger component.

[0011] Wherein, the fixing bracket comprises:

[0012] a first fixing plate connected to the first end of the elastic member;

[0013] a second fixing plate connected to a first end of the first fixing plate;

[0014] a third fixing plate, the third fixing plate being connected to the second end of the first fixing plate;

[0015] Among them, the second fixed plate is provided with a first longitudinal through hole, the third fixed plate is provided with a second longitudinal through hole, and the first longitudinal through hole and the second longitudinal through hole both extend along the first direction; the first end of the tension monitoring roller is slidably set in the first longitudinal through hole, and the second end of the tension monitoring roller is movably set in the second longitudinal through hole.

[0016] Wherein, the tension monitoring roller comprises:

[0017] Active roller body;

[0018] A first roller shaft, the first roller shaft is arranged at the first end of the movable roller body, and the first roller shaft is slidably matched with the first longitudinal through hole;

[0019] A second roller shaft, the second roller shaft is arranged at the second end of the movable roller body, and the second roller shaft is slidably matched with the second longitudinal through hole;

[0020] The diameter of the first roller shaft and the diameter of the second roller shaft are both smaller than the diameter of the movable roller body.

[0021] Wherein, two elastic members are provided, and the two elastic members are connected to the first roller shaft and the second roller shaft respectively.

[0022] Wherein, the trigger component includes a trigger spring.

[0023] Wherein, the trigger spring is located on the second fixing plate, and in the first direction, the trigger spring is located on the side of the first longitudinal through hole away from the elastic member and extends toward the movable roller body; and / or,

[0024] The trigger spring is located on the third fixing plate. In the first direction, the trigger spring is located on a side of the second longitudinal through hole away from the elastic member and extends toward the movable roller body.

[0025] Wherein, the tension monitoring device further comprises:

[0026] A connecting rod, wherein a first end of the connecting rod is connected to the first fixing plate, and a second end of the connecting rod is used to be connected to the workbench.

[0027] Wherein, the tension monitoring device further comprises:

[0028] A first drafting roller is used to guide the carbon fiber precursor into the tension monitoring roller.

[0029] Wherein, the tension monitoring device further comprises:

[0030] The second drafting roller is used to guide the carbon fiber precursor on the tension monitoring roller.

[0031] Beneficial effects: The tension monitoring device includes a fixed bracket, a tension monitoring roller, an elastic member, a trigger component and an alarm device. The elastic member is connected between the fixed bracket and the tension monitoring roller, the trigger component is electrically connected to the alarm component, and the trigger component is arranged on the downstream side of the tension monitoring roller. During the transmission of the carbon fiber precursor, when the tension of the carbon fiber precursor is small, the force of the carbon fiber precursor supporting the bottom of the tension monitoring roller becomes smaller, and the downward movement of the tension monitoring roller will contact the trigger component, so that the alarm device will sound an alarm. By determining whether the tension monitoring roller triggers the alarm device, it is possible to timely and accurately determine whether there is a tension problem with the carbon fiber precursor, thereby improving the accuracy of the carbon fiber precursor tension monitoring. Moreover, when the steam drawing machine causes the carbon fiber precursor to relax due to driving reasons, the tension monitoring device can timely sound an alarm to avoid the carbon fiber precursor from being entangled, thereby avoiding the waste of carbon fiber precursor and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a structural schematic diagram of a tension monitoring device provided according to an exemplary embodiment of the utility model;

[0034] Figure 2 It is a structural schematic diagram of a tension monitoring device provided according to another exemplary embodiment of the utility model;

[0035] Figure 3 It is a schematic structural diagram of a tension monitoring device provided according to another exemplary embodiment of the utility model.

[0036] The following are marked in the accompanying drawings:

[0037] 10. Fixed bracket; 11. First fixed plate; 12. Second fixed plate; 121. First longitudinal through hole; 13. Third fixed plate; 131. Second longitudinal through hole; 20. Tension monitoring roller; 21. Active roller body; 22. First roller shaft; 23. Second roller shaft; 30. Elastic member; 40. Trigger component; 41. Trigger spring; 50. Connecting rod; 60. First stretching roller; 70. Second stretching roller; T. Carbon fiber precursor. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the utility model.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the prior art, in order to monitor the tension of carbon fiber precursor, the driving current of the steam drawing machine is usually used to monitor whether the carbon fiber precursor has tension problems. However, the driving current needs to be obtained by real-time observation by the staff through a computer, and there are many factors that affect the driving current. When the driving current is abnormal, it is impossible to immediately determine whether it is caused by the tension problem of the carbon fiber precursor.

[0041] Combine the following Figures 1 to 3 The embodiments of the present utility model are further described.

[0042] In order to solve the above technical problems, Figure 1 As shown, an exemplary embodiment of the utility model provides a tension monitoring device, which includes a fixed bracket 10, a tension monitoring roller 20, an elastic member 30, a trigger component 40 and an alarm device (not shown in the figure). The tension monitoring roller 20 is movably arranged on the fixed bracket 10, and can move relative to the fixed bracket 10 along a first direction, and the first direction is perpendicular to the axis of the tension monitoring roller 20. The first end of the elastic member 30 is connected to the fixed bracket 10, and the second end of the elastic member 30 is connected to the tension monitoring roller 20. The elastic member 30 is used to provide an elastic force in the first direction to the tension monitoring roller 20. In the first direction, the trigger component 40 is arranged on the downstream side of the tension monitoring roller 20. The alarm device is electrically connected to the trigger component 40.

[0043] In this embodiment, the tension monitoring device includes a fixed bracket, a tension monitoring roller, an elastic member, a trigger component and an alarm device. The elastic member is connected between the fixed bracket and the tension monitoring roller, the trigger component is electrically connected to the alarm component, and the trigger component is arranged on the downstream side of the tension monitoring roller. During the transmission of the carbon fiber precursor, when the tension of the carbon fiber precursor is small, the force of the carbon fiber precursor supporting the bottom of the tension monitoring roller becomes smaller, and the tension monitoring roller moves downward to contact the trigger component, so that the alarm device sounds an alarm. By determining whether the tension monitoring roller triggers the alarm device, it is possible to timely and accurately determine whether there is a tension problem with the carbon fiber precursor, thereby improving the accuracy of the carbon fiber precursor tension monitoring. Moreover, when the steam drawing machine causes the carbon fiber precursor to relax due to driving reasons, the tension monitoring device can timely alarm to avoid the carbon fiber precursor from being entangled, thereby avoiding the waste of the carbon fiber precursor and reducing the production cost.

[0044] For example, Figure 1 As shown, during the transmission of the carbon fiber precursor T, when the tension of the carbon fiber precursor T is normal, the carbon fiber precursor T supports the bottom of the tension monitoring roller 20 so that the tension monitoring roller 20 is subjected to an upward force, the elastic member 30 contracts, the tension monitoring roller 20 cannot contact the trigger component 40, and the alarm device does not sound an alarm. When the tension of the carbon fiber precursor T is small, the upward force on the tension monitoring roller 20 becomes smaller, the elastic member 30 stretches, the tension monitoring roller 20 moves downward so that the tension monitoring roller 20 contacts the trigger component 40, and the alarm device sounds an alarm.

[0045] For example, Figure 2 As shown, in the first direction, the trigger component 40 is arranged on the upstream side of the tension monitoring roller 20. During the transmission of the carbon fiber precursor T, when the tension of the carbon fiber precursor T is normal, the carbon fiber precursor T applies force to the top of the tension monitoring roller 20 so that the tension monitoring roller 20 is subjected to a downward force, the elastic member 30 contracts, the tension monitoring roller 20 cannot contact the trigger component 40, and the alarm device does not sound an alarm. When the tension of the carbon fiber precursor T is small, the downward force on the tension monitoring roller 20 becomes smaller, the elastic member 30 stretches, the tension monitoring roller 20 moves upward so that the tension monitoring roller 20 contacts the trigger component 40, and the alarm device sounds an alarm.

[0046] Exemplarily, the alarm device can be arranged on the fixed bracket 10, or can be arranged at the production site of the carbon fiber precursor, and the alarm device can be a buzzer alarm, a light alarm, an audible and visual alarm, or other alarms.

[0047] For example, when the surface of the tension monitoring roller 20 is smooth, the tension monitoring roller 20 can be in a rotating state or in a stationary state during the transmission of the carbon fiber precursor T. When the surface of the tension monitoring roller 20 is rough, the tension monitoring roller 20 is in a rotating state during the transmission of the carbon fiber precursor T. This avoids the carbon fiber precursor T from being damaged by the friction of the tension monitoring roller 20, thereby improving the quality of the carbon fiber precursor T.

[0048] In one embodiment, if Figure 1 As shown, the fixing bracket 10 includes a first fixing plate 11, a second fixing plate 12 and a third fixing plate 13. The first fixing plate 11 is connected to the first end of the elastic member 30, the second fixing plate 12 is connected to the first end of the first fixing plate 11, and the third fixing plate 13 is connected to the second end of the first fixing plate 11. The second fixing plate 12 and the third fixing plate 13 are arranged side by side along the axis direction of the tension monitoring roller 20, and the two ends of the tension monitoring roller 20 are slidably connected to the second fixing plate 12 and the third fixing plate 13 respectively.

[0049] In this embodiment, the tension monitoring roller is limited in the space formed by the first fixed plate, the second fixed plate and the third fixed plate, which improves the compactness of the tension monitoring device structure. Moreover, the tension monitoring roller is limited by the second fixed plate and the third fixed plate, so that the tension monitoring roller can move along the gravity direction, and the movement path of the tension monitoring roller is more regular, thereby improving the accuracy of the tension monitoring roller monitoring.

[0050] In one embodiment, if Figure 1 As shown, the second fixing plate 12 is provided with a first longitudinal through hole 121, and the third fixing plate 13 is provided with a second longitudinal through hole 131, and both the first longitudinal through hole 121 and the second longitudinal through hole 131 extend along the first direction. The first end of the tension monitoring roller 20 is slidably disposed in the first longitudinal through hole 121, and the second end of the tension monitoring roller 20 is movably disposed in the second longitudinal through hole 131.

[0051] In the present embodiment, since the tension monitoring roller moves along the direction of gravity, the path of the tension monitoring roller moving along the direction of gravity is further limited by setting the first longitudinal through hole and the second longitudinal through hole, so as to avoid the carbon fiber filament being torn by the tension monitoring roller due to the unrestricted movement path when the tension monitoring roller moves along the direction of gravity, thereby improving the reliability of the tension monitoring device.

[0052] Exemplarily, a first longitudinal slide rail can be set on the second fixed plate 12, and a second longitudinal slide rail can be set on the third fixed plate 13. The first longitudinal slide rail and the second longitudinal slide rail both extend in the first direction. The first end of the tension monitoring roller 20 is movably set on the first longitudinal slide rail, and the second end of the tension monitoring roller 20 is movably set on the second longitudinal slide rail.

[0053] In one embodiment, if Figure 1 As shown, the tension monitoring roller 20 includes a movable roller body 21, a first roller shaft 22, and a second roller shaft 23. The first roller shaft 22 is disposed at the first end of the movable roller body 21, and the first roller shaft 22 is slidably matched with the first longitudinal through hole 121. The second roller shaft 23 is disposed at the second end of the movable roller body 21, and the second roller shaft 23 is slidably matched with the second longitudinal through hole 131. The diameter of the first roller shaft 22 and the diameter of the second roller shaft 23 are both smaller than the diameter of the movable roller body 21.

[0054] In this embodiment, since the movable roller body is in a rotating state when supported by the carbon fiber precursor, the carbon fiber precursor is prevented from being damaged by the friction of the movable roller body, thereby improving the quality of the carbon fiber precursor. In addition, the movable roller body is slidably connected to the first longitudinal through hole and the second longitudinal through hole through the first roller shaft and the second roller shaft, respectively, avoiding the wear of the movable roller body directly connected to the longitudinal through hole and affecting the monitoring result, thereby extending the service life of the tension monitoring device and improving the accuracy of the tension monitoring device.

[0055] In one embodiment, if Figure 1 As shown, two elastic members 30 are provided, and the two elastic members 30 are connected to the first roller shaft 22 and the second roller shaft 23 respectively.

[0056] In this embodiment, two elastic members are respectively connected to the first roller shaft and the second roller shaft, so that the two elastic members are respectively connected to the first end and the second end of the movable roller body, thereby improving the stability of the movable roller body in the tension monitoring device. Moreover, when the movable roller body moves in the direction of gravity, due to the elastic force of the elastic member, the movable roller body will be reset to the vicinity of the initial position after moving a certain distance, further avoiding the movable roller body from breaking the carbon fiber precursor, thereby improving the reliability of the tension monitoring device.

[0057] Exemplarily, the elastic member 30 may be a spring.

[0058] In one embodiment, the trigger component 40 includes a trigger spring 41 .

[0059] In this embodiment, since the structure of the trigger spring is simple, the complexity of the structure of the tension monitoring device is reduced by the trigger component including the trigger spring.

[0060] Exemplarily, the trigger spring 41 may be electrically connected to the alarm device via a signal line.

[0061] In one embodiment, if Figure 1As shown, the trigger spring is located on the second fixed plate 12, and in the first direction, the trigger spring is located on the side of the first longitudinal through hole 121 away from the elastic member 30 and extends toward the movable roller body 21; and / or, the trigger spring is located on the third fixed plate 13, and in the first direction, the trigger spring is located on the side of the second longitudinal through hole 131 away from the elastic member 30 and extends toward the movable roller body 21.

[0062] In this embodiment, since the trigger spring extends toward the movable roller body, when the tension of the carbon fiber precursor is small, the movable roller body will move downward to contact the trigger spring so that the alarm device will sound an alarm. When the trigger spring is located on the second fixed plate or the third fixed plate, the manufacturing cost of the tension monitoring device can be saved. When the trigger spring is located on the second fixed plate and the third fixed plate, the accuracy of the tension monitoring device can be improved.

[0063] For example, a trigger spring 41 may be provided and located at both the second fixing plate 12 and the third fixing plate 13. Two trigger springs 41 may also be provided, and the two trigger springs 41 are respectively located at the second fixing plate 12 and the third fixing plate 13. When two trigger springs 41 are provided, one alarm device may be provided or two alarm devices may be provided. When one alarm device is provided, the two trigger springs 41 are electrically connected to the same alarm device. When two alarm devices are provided, the two trigger springs 41 are electrically connected to the two alarm devices respectively.

[0064] In one embodiment, if Figure 3 As shown, the tension monitoring device further includes a connecting rod 50, a first end of the connecting rod 50 is connected to the first fixing plate 11, and a second end of the connecting rod 50 is used to connect to the workbench.

[0065] In this embodiment, since the carbon fiber precursor is always in a transmission state during the steam drawing process, the connecting rod fixes the tension monitoring device on the workbench to monitor the tension of the carbon fiber precursor transmitted during the steam drawing process. By monitoring the tension of the carbon fiber precursor during the steam drawing process, the monitoring efficiency is improved.

[0066] For example, when the tension of the carbon fiber precursor T is relatively small, the tension of the carbon fiber precursor T can be increased by adjusting the parameters of the steam drawing machine.

[0067] In one embodiment, if Figure 3 As shown, the tension monitoring device further includes a first drafting roller 60 , which is used to guide the carbon fiber precursor T into the tension monitoring roller 20 .

[0068] In this embodiment, the carbon fiber precursor is introduced into the tension monitoring roller through the first drafting roller, so that the transmission speed of the carbon fiber precursor is controlled by the rotation speed of the first drafting roller, thereby reducing the risk of carbon fiber precursor breakage during the production process.

[0069] In one embodiment, if Figure 3 As shown, the tension monitoring device further includes a second drafting roller 70 , which is used to guide the carbon fiber precursor T on the tension monitoring roller 20 .

[0070] In this embodiment, the carbon fiber precursor is guided out of the tension monitoring roller by the second stretching roller, so that the transmission speed of the carbon fiber precursor is controlled by the rotation speed of the second stretching roller, so that the transmission speed of the carbon fiber precursor matches the speed of other processes on the production line, thereby improving the reliability of carbon fiber precursor production.

[0071] An exemplary embodiment of the present disclosure provides a tension monitoring device, such as Figure 1 and Figure 3 As shown, the tension monitoring device includes a first fixed plate 11, a second fixed plate 12, a third fixed plate 13, a movable roller body 21, a first roller shaft 22, a second roller shaft 23, two elastic members 30, a trigger spring 41, an alarm device (not shown in the figure), a connecting rod 50, a workbench (not shown in the figure), a first drafting roller 60 and a second drafting roller 70. The first fixed plate 11 is connected to the workbench (not shown in the figure) through the connecting rod 50, the first end of the first fixed plate 11 is connected to the first end of one elastic member 30 and the second fixed plate 12, the second end of the first fixed plate 11 is connected to the first end of another elastic member 30 and the third fixed plate 13, the second end of one elastic member 30 is connected to the first roller shaft 22, and the second end of the other elastic member 30 is connected to the second roller shaft 23. The first roller shaft 22 is slidably matched with the first longitudinal through hole 121 of the second fixed plate 12, the second roller shaft 23 is slidably matched with the second longitudinal through hole 131 of the third fixed plate 13, and the first roller shaft 22 and the second roller shaft 23 are respectively arranged at the first end and the second end of the movable roller body 21. The trigger spring piece 41 is located on the second fixed plate 12. In the first direction, the trigger spring piece 41 is located on the side of the first longitudinal through hole 121 away from an elastic member 30 and extends toward the movable roller body 21. The trigger spring piece 41 is electrically connected to an alarm device (not shown in the figure). The first drafting roller 60 and the second drafting roller 70 are both located on the workbench. The first drafting roller 60 is used to introduce the carbon fiber precursor T into the movable roller body 21, and the second drafting roller 70 is used to guide the carbon fiber precursor T on the movable roller body 21.

[0072] The working principle of the utility model is described as follows:

[0073] During the transmission of the carbon fiber precursor T, the movable roller body 21 keeps rotating. When the tension of the carbon fiber precursor T is normal, the carbon fiber precursor T supports the bottom of the movable roller body 21 so that the movable roller body 21 is subjected to an upward force, the elastic member 30 contracts, the movable roller body 21 cannot contact the trigger spring 41, and the alarm device does not sound an alarm. When the tension of the carbon fiber precursor T is small, the upward force on the movable roller body 21 becomes smaller, the elastic member 30 stretches, the movable roller body 21 moves downward so that the movable roller body 21 contacts the trigger spring 41, and the alarm device sounds an alarm.

[0074] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the utility model concept. The protection scope of the utility model should not be deemed to be limited to the specific forms described in the embodiments. The protection scope of the utility model also includes equivalent technical means that can be thought of by technical personnel in this field based on the concept of the utility model.

Claims

1. A tension monitoring device, characterized in that: The tension monitoring device comprises: Fixed bracket; a tension monitoring roller, movably disposed on the fixed bracket and capable of moving relative to the fixed bracket along a first direction, wherein the first direction is perpendicular to the axis of the tension monitoring roller; an elastic member, wherein a first end of the elastic member is connected to the fixed bracket, a second end of the elastic member is connected to the tension monitoring roller, and the elastic member is used to provide an elastic force in the first direction to the tension monitoring roller; a trigger component, wherein the trigger component is disposed on a downstream side of the tension monitoring roller in the first direction; An alarm device is electrically connected to the trigger component.

2. The tension monitoring device according to claim 1, characterized in that: The fixing bracket comprises: a first fixing plate connected to the first end of the elastic member; a second fixing plate connected to a first end of the first fixing plate; a third fixing plate, the third fixing plate being connected to the second end of the first fixing plate; The second fixing plate and the third fixing plate are arranged side by side along the axis direction of the tension monitoring roller, and two ends of the tension monitoring roller are slidably connected to the second fixing plate and the third fixing plate respectively.

3. The tension monitoring device according to claim 2, characterized in that: The second fixed plate is provided with a first longitudinal through hole, and the third fixed plate is provided with a second longitudinal through hole, and the first longitudinal through hole and the second longitudinal through hole both extend along the first direction; the first end of the tension monitoring roller is slidably arranged in the first longitudinal through hole, and the second end of the tension monitoring roller is movably arranged in the second longitudinal through hole.

4. The tension monitoring device according to claim 3, characterized in that: The tension monitoring roller comprises: Active roller body; A first roller shaft, the first roller shaft is arranged at the first end of the movable roller body, and the first roller shaft is slidably matched with the first longitudinal through hole; A second roller shaft, the second roller shaft is arranged at the second end of the movable roller body, and the second roller shaft is slidably matched with the second longitudinal through hole; The diameter of the first roller shaft and the diameter of the second roller shaft are both smaller than the diameter of the movable roller body.

5. The tension monitoring device according to claim 4, characterized in that: Two elastic members are provided, and the two elastic members are connected to the first roller shaft and the second roller shaft respectively.

6. The tension monitoring device according to claim 4, characterized in that: The trigger component includes a trigger spring.

7. The tension monitoring device according to claim 6, characterized in that: The trigger spring is located on the second fixing plate, and in the first direction, the trigger spring is located on the side of the first longitudinal through hole away from the elastic member and extends toward the movable roller body; and / or, The trigger spring is located on the third fixing plate. In the first direction, the trigger spring is located on a side of the second longitudinal through hole away from the elastic member and extends toward the movable roller body.

8. The tension monitoring device according to any one of claims 2 to 7, characterized in that: The tension monitoring device also includes: A connecting rod, wherein a first end of the connecting rod is connected to the first fixing plate, and a second end of the connecting rod is used to be connected to the workbench.

9. The tension monitoring device according to any one of claims 2 to 7, characterized in that: The tension monitoring device also includes: A first drafting roller is used to guide the carbon fiber precursor into the tension monitoring roller.

10. The tension monitoring device according to any one of claims 2 to 7, characterized in that: The tension monitoring device also includes: The second drafting roller is used to guide the carbon fiber precursor on the tension monitoring roller.

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