Low-stress temperature-sensing triggering fireproof curtain

Abstract

The invention belongs to the technical field of building fire prevention, and particularly relates to a low-stress temperature-sensing triggering fireproof curtain. Comprising a roller shutter, a guide rail and a reel assembly. The upper end of the roller shutter is connected with the reel assembly; the reel assembly comprises a winding part used for winding and unwinding the roller shutter. The energy storage mechanism drives the winding part to have a winding trend; the low-stress temperature sensing trigger mechanism comprises a brittle thermosensitive element; the mechanism is configured to enable the brittle thermosensitive element to bear a preset axial pre-tightening force in a normal state, so as to maintain the locking of the energy storage mechanism; when the brittle thermosensitive element fails due to temperature rise, the energy storage mechanism is unlocked, so that the roller shutter is unfolded; through the original'supporting wheel-locking pin 'clutch design, 'force decoupling' is realized; huge shear load generated by the self weight of the roller shutter is rigidly borne by a metal structure of the locking pin and a supporting wheel hole; the brittle thermosensitive element only bears an adjustable tiny axial pre-tightening force used for maintaining the position of the locking pin.

Description

Technical Field

[0001] This invention belongs to the field of building fire protection technology, specifically relating to a low-stress temperature-triggered fireproof curtain. Background Technology

[0002] One of the most feared hidden dangers for residents and office workers in high-rise residential and office buildings is fires starting on lower floors. Once a fire breaks out on a lower floor, not only are downward escape routes cut off, but the fire can also spread violently upwards using the vertical airflow from the building's facade, allowing flames to directly lick at the windows of upper floors. The high temperature causes the glass to shatter, the surrounding seals to melt, and open flames then enter the upper floors, igniting various flammable materials and causing the fire to spread upwards floor by floor. To prevent the impact of lower-floor fires on upper floors, protective measures such as installing fire-resistant doors and windows have been implemented, but the problem of window glass being easily damaged by high temperatures has not been effectively solved, and open flames can still enter the room through broken windows.

[0003] Existing technologies disclose several fire-resistant roller shutters that can be installed inside windows to close them in the event of a fire. For example, CN208251964U discloses an automatic fire-extinguishing roller shutter door, CN223497812U discloses a heat-insulating fire-resistant roller shutter door, and CN218347293U discloses an inflatable fire-resistant roller shutter door. However, all of these utilize motors to drive the shutters to roll up or open. Since motors rely on electricity, the spread of fire could damage the electrical system, posing a safety hazard as the shutters may fail to completely close the window.

[0004] Furthermore, existing mechanical temperature-controlled release devices that use brittle components such as fusible alloys and thermosensitive glass typically place the trigger element directly in the main load-bearing chain (e.g., directly locking the pivot that bears the weight of the curtain). This forces the brittle component to continuously withstand enormous static loads (often hundreds of Newtons) during long periods of standby, making it highly susceptible to unexpected breakage due to stress relaxation or material fatigue before reaching the preset temperature, leading to malfunctions and compromising reliability. Simultaneously, such devices are extremely sensitive to vibration. Summary of the Invention

[0005] This invention aims to solve the problems of false triggering and poor reliability caused by the long-term high load on brittle components in existing mechanical temperature control triggering devices.

[0006] This invention provides the following technical solution: a low-stress, temperature-sensitive, triggered fireproof curtain, comprising a roller shutter, a guide rail, and a roller assembly; the upper end of the roller shutter is connected to the roller assembly; the roller assembly includes: The winding section is used to raise and lower the roller blind; An energy storage mechanism that drives the winding section to have a winding tendency; A low-stress temperature-sensitive triggering mechanism includes a brittle thermistor; the mechanism is configured to: under normal conditions, subject the brittle thermistor to a preset axial preload, thereby maintaining the locking of the energy storage mechanism; when the brittle thermistor fails due to temperature rise, release the locking of the energy storage mechanism, allowing the roller shutter to unfold.

[0007] Furthermore, the low-stress temperature-sensitive triggering mechanism includes a lockable support wheel, a locking pin, and an elastic element that drives the locking pin; the brittle thermal element maintains the locking pin's lock on the support wheel by resisting the driving force of the elastic element.

[0008] Furthermore, the winding part is rotatably mounted on the outer casing, the support wheel is coaxial with the winding part, one end of the support wheel is rotatably connected to the winding part and the other end is rotatably connected to the outer casing, and the energy storage mechanism is a coil spring connected between the support wheel and the winding part.

[0009] Furthermore, the low-stress temperature-sensing triggering mechanism includes a bracket, which is fixedly connected to the housing. A locking pin is slidably inserted into the bracket. The support wheel has a pin hole that matches the locking pin. An elastic element is connected between the bracket and the locking pin, and the elastic element imparts a force to the locking pin to disengage from the pin hole.

[0010] Furthermore, the low-stress temperature-sensing triggering mechanism also includes a breaker, which is linked to the fire protection system. The breaker triggers the brittle thermal element by receiving a signal from the fire protection system.

[0011] Furthermore, an adjusting screw is threaded onto the bracket, and a brittle thermal element is located between the adjusting screw and the locking pin.

[0012] Furthermore, the guide rail is equipped with a first fire-resistant expansion strip on both the front and rear sides of the roller shutter; a second fire-resistant expansion strip is provided at the lower end of the roller shutter.

[0013] Furthermore, a third fire-resistant expansion strip is provided at the joint between the slats of the roller shutter.

[0014] Furthermore, it also includes two upper fireproof edge strips, which are located on the front and rear sides of the roller shutter. The inner surfaces of the two upper fireproof edge strips are provided with a fourth fireproof expansion strip, and the first fireproof expansion strip, the second fireproof expansion strip, and the fourth fireproof expansion strip are connected to form a closed sealing ring.

[0015] Furthermore, a downward elastic booster is installed on the upper fireproof edge strip. The lower end of the roller shutter is stopped by the elastic booster, and the roller shutter pushes the elastic booster to store force when it rolls up.

[0016] Furthermore, the friction between the locking pin and the bracket, and between the locking pin and the support wheel, is rolling friction.

[0017] Furthermore, the locking pin has a variable cross-section structure. The cross-section of the mating part between the locking pin and the bracket is wide, and the cross-section narrows from the mating part toward the direction in which the locking pin disengages.

[0018] Compared with the prior art, the advantages of the present invention are: This invention provides a low-stress temperature-triggered fireproof curtain that achieves "force decoupling" through an innovative "support wheel-locking pin" clutch design: the enormous shear load generated by the curtain's own weight is rigidly borne by the metal structure of the locking pin and the support wheel hole; while the brittle thermal element only bears a small, adjustable axial preload (≤15N) to maintain the locking pin's position. This fundamentally solves the industry problem of false triggering caused by long-term high-stress operation of mechanical temperature control elements, achieving near-intrinsically safe and reliable standby.

[0019] The winding section is connected to the energy storage mechanism, which is used to roll up the shutter. The energy storage mechanism is connected between the support wheel and the winding section. The low-stress temperature-sensing trigger mechanism switches between the fixed state and the free rotation state of the support wheel. When the support wheel is in the fixed state, it can provide reaction force support to the energy storage mechanism, and the energy storage mechanism can provide rotational torque to the winding section. When the support wheel is in the free rotation state, the support wheel can rotate with the winding section, and the energy storage mechanism is ineffective. The shutter wound on the winding section unfolds under its own weight at the lower end and automatically closes the window.

[0020] The low-stress temperature-sensing trigger mechanism is activated by a brittle thermistor. When this brittle thermistor breaks under high temperature, the mechanism switches the support wheel from a fixed state to a free-rotating state, enabling automatic activation in case of fire. The triggering process is purely physical; the roller shutter releases using gravity, requiring no electricity and ensuring high safety. Compared to other energy-storage drive methods that do not rely on electricity, the roller shutter's gravity-based release offers significant advantages: the energy storage device may be damaged due to age or high temperatures during a fire, but gravity will not disappear, and it is unaffected by temperature or maintenance cycles.

[0021] The roller shutter relies on an energy storage mechanism to maintain its retracted state. If the energy storage mechanism fails or the brittle thermal element breaks, the roller shutter will only unfold unexpectedly, and the user can repair and reset it after discovering the problem; there is no safety hazard of the roller shutter failing to unfold in the event of a fire. Furthermore, no matter where the roller shutter is stopped, as long as the brittle thermal element is triggered, the roller shutter will completely close the window.

[0022] To increase the roll-up speed of the shutter, an elastic booster is added to the upper fireproof edge strip. When the energy storage mechanism fails, the elastic booster applies a downward thrust to the shutter, accelerating its roll-up speed.

[0023] The first fire-resistant expansion strip in the guide rail, the second fire-resistant expansion strip at the bottom of the roller shutter, and the fourth fire-resistant expansion strip in the upper fire-resistant edge strip form a closed sealing ring. When the temperature is high, the first, second, and fourth fire-resistant expansion strips expand due to heat, and the roller shutter is sealed around its perimeter, preventing smoke from flowing into the room. A third fire-resistant expansion strip is installed in the gaps of the roller shutter itself. When the temperature is high, the third fire-resistant expansion strip expands due to heat, and the roller shutter itself forms a "complete baffle" to prevent smoke from flowing into the room. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a low-stress temperature-sensitive fireproof curtain. Figure 2 This is a schematic diagram of the low-stress temperature-sensing triggering mechanism of Example 1; Figure 3 This is a schematic diagram of the low-stress temperature-sensing triggering mechanism of Example 2; Figure 4 This is a schematic diagram of the viewable window on the outer casing; Figure 5 This is a schematic diagram of the fourth, third, and second fire-resistant expansion strips; Figure 6 This is a cross-sectional view of the guide rail; Figure 7 This is a schematic diagram of the low-stress temperature-sensing triggering mechanism of Example 3; Figure 8 for Figure 7 A magnified view of a specific part.

[0025] In the diagram: 1-Roller blind; 1.1-Slats; 2-Guide rail; 3-Outer shell; 3.1-Viewing window; 4-Rolling section; 5-Fragile heat-sensitive element; 6-Energy storage mechanism; 7-Support wheel; 8-Bracket; 9-Locking pin; 10-Elastic element; 11-Breaker; 12-Adjusting screw; 13-First fireproof expansion strip; 14-Second fireproof expansion strip; 15-Third fireproof expansion strip; 16-Upper fireproof edge strip; 17-Fourth fireproof expansion strip; 18-Booster; 19-Wide lower beam; 20-Linear bearing; 21-Flexible pad. Detailed Implementation

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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 effort.

[0027] like Figure 1As shown: A low-stress temperature-triggered fireproof curtain includes a roller shutter 1, guide rails 2 and a roller assembly; the upper end of the roller shutter 1 is connected to the roller assembly, and the lower end is slidably nested between two guide rails 2; the guide rails 2 guide the unfolded roller shutter 1, so that the roller shutter 1 is unfolded into a flat state.

[0028] like Figure 2 As shown: The roller assembly includes a housing 3, a winding section 4, an energy storage mechanism 6, and a low-stress temperature-sensing trigger mechanism; the low-stress temperature-sensing trigger mechanism includes a brittle thermal element 5, a support wheel 7, a bracket 8, a locking pin 9, and an elastic element 10; the winding section 4 is rotatably mounted on the housing 3, and the upper end of the roller blind 1 is connected to the winding section 4. The winding section 4 can rotate freely on the housing 3. When the winding section 4 rotates clockwise, it winds up the roller blind 1; when the winding section 4 rotates counterclockwise, it unfolds the roller blind 1. The winding section 4 is connected to the energy storage mechanism 6, and the driving force of the energy storage mechanism 6 keeps the winding section 4 inclined to wind up the roller blind 1.

[0029] The state of the energy storage mechanism 6 is adjusted by a low-stress temperature-sensing trigger mechanism. Under normal conditions, the brittle thermistor 5 remains intact, and the energy storage mechanism 6 drives the winding section 4 to roll up the shutter 1. In an emergency, the brittle thermistor 5 breaks, the energy storage mechanism 6 fails, releasing the driving force on the winding section 4, allowing the winding section 4 to freely reverse, and the shutter 1 to unfold. The normal state represents a safe state, meaning no fire or other high-temperature disaster has occurred. In an emergency, the high temperature damages the brittle thermistor 5, causing the energy storage mechanism 6 to fail.

[0030] The energy storage mechanism 6 uses a coil spring. The support wheel 7 is coaxial with the winding part 4. One end of the support wheel 7 is rotatably connected to the winding part 4, and the other end is rotatably connected to the outer casing 3. The energy storage mechanism 6 is connected between the support wheel 7 and the winding part 4. The energy storage mechanism 6 uses the support wheel 7 as a reaction force to support and push the winding part 4 to maintain the tendency of the roller blind 1 to roll up. The bracket 8 is fixedly connected to the outer casing 3. The locking pin 9 is slidably inserted into the bracket 8. The locking pin 9 can move along its axial direction. The support wheel 7 has a pin hole that matches the locking pin 9. The elastic element 10 is connected between the bracket 8 and the locking pin 9. The elastic element 10 gives the locking pin 9 the force to disengage from the pin hole. The brittle thermal element 5 is located at the bottom of the locking pin 9. The locking pin 9 and the pin hole of the support wheel 7 are rigidly engaged. The load caused by the weight of the roller blind 1 is borne by the engagement position as a shear force and is not transmitted to the brittle thermal element 5. By using the intermediate conversion structure of "support wheel 7-locking pin 9", the brittle thermal element 5 is decoupled from the high shear force load-bearing chain, so that it only bears a small axial preload (≤15N), thereby achieving unprecedented triggering reliability.

[0031] The low-stress temperature-sensing trigger mechanism can lock or release the support wheel 7. When the low-stress temperature-sensing trigger mechanism locks the support wheel 7, the support wheel 7 is fixed relative to the outer shell 3. At this time, the spring force drives the winding part 4 to rotate. When the low-stress temperature-sensing trigger mechanism releases the support wheel 7, that is, the fixed relationship between the support wheel 7 and the outer shell 3 is released, the support wheel 7 can rotate freely relative to the outer shell 3. That is, both the support wheel 7 and the winding part 4 are in a free rotation state. The spring cannot use the support wheel 7 as a reaction force to support and drive the winding part 4 to rotate, and the spring fails.

[0032] In this embodiment, the support wheel 7 does not necessarily have to be a "wheel". It can also be a disc, block, rod, etc. It is rotatable and coaxially assembled with the winding part 4 to realize the action of a "wheel".

[0033] Under normal conditions, the brittle thermal element 5 supports the locking pin 9, preventing the locking pin 9 from coming out of the pin hole. The locking pin 9 remains inserted into the pin hole of the support wheel 7, and the rotation of the support wheel 7 is hindered. In a dangerous situation, the brittle thermal element 5 fails to support the locking pin 9, the elastic element 10 pushes the locking pin 9 away from the pin hole, and the support wheel 7 can rotate freely.

[0034] The elastic element 10 is a spring, which is sleeved on the locking pin 9. One end of the spring supports the bracket 8 and the other end supports the protrusion on the locking pin 9. The elastic element 10 can also be a tension spring, with one end of the tension spring hanging on the locking pin 9 and the other end hanging on the bracket 8.

[0035] An adjusting screw 12 is threaded onto the bracket 8. The brittle thermal element 5 is located between the adjusting screw 12 and the locking pin 9. The adjusting screw 12 is adjusted according to the length of the brittle thermal element 5.

[0036] The brittle thermal element 5 uses a thermal glass bulb and is available in various specifications with breakage rates of 57℃, 68℃, 79℃, and 93℃, which can be selected according to the installation location and / or fire protection requirements of the fire curtain.

[0037] In the locked state, the weight of the roller shutter 1 and the winding force of the energy storage mechanism 6 together constitute a torque that causes the support wheel 7 to rotate clockwise. This torque is converted into a shear force F1 between the locking pin 9 and the pin hole wall, which is entirely borne by the metal locking pin 9 and the support wheel 7. At the same time, the locking pin 9 is subjected to an axial thrust F2 exerted by the elastic element 10 to disengage it from the pin hole. The brittle thermal element 5 balances F2 by providing an axial support force of equal magnitude and opposite direction. Therefore, the brittle thermal element 5 only bears the axial pressure F2, the value of which can be set in a very low range (e.g., 8N) by adjusting the screw 12, and is completely independent of the large shear force F1. This achieves "low-stress triggering".

[0038] like Figure 4As shown: The outer casing 3 has a viewing window 3.1, which allows for external inspection of the status of the low-stress temperature-sensing trigger mechanism.

[0039] When installing the fireproof curtain, the roller assembly is installed at the top of the window, and the two guide rails 2 are installed on both sides of the window.

[0040] like Figure 5 , Figure 6 As shown: A first fire-resistant expansion strip 13 is provided on both the front and rear sides of the roller shutter 1 within the guide rail 2; a second fire-resistant expansion strip 14 is provided at the lower end of the roller shutter 1. A third fire-resistant expansion strip 15 is provided at the connection between the slats 1.1 of the roller shutter 1. The first fire-resistant expansion strip 13, the second fire-resistant expansion strip 14, and the third fire-resistant expansion strip 15 expand in volume due to high temperature. The first fire-resistant expansion strip 13 seals the gap between the guide rail 2 and the roller shutter 1 to prevent smoke from entering; the second fire-resistant expansion strip 14 seals the gap between the roller shutter 1 and the windowsill to prevent smoke from entering; and the third fire-resistant expansion strip 15 blocks the gap between the slats 1.1 of the roller shutter 1 to prevent smoke from entering. The slats 1.1 of the roller blind 1 are made of stainless steel. The connection between the slats 1.1 of the roller blind 1 is that two adjacent slats 1.1 are connected by a large hook and a small hook in a movable nesting manner, so as to realize the relative rotation of the two slats 1.1. The third fireproof expansion strip 15 is located inside the small hook. The third fireproof expansion strip 15 expands inside the small hook and seals the gap between the large hook and the small hook after expansion.

[0041] It also includes two upper fire-resistant edge strips 16, located on the front and rear sides of the roller shutter 1, below the roller assembly. The two upper fire-resistant edge strips 16 are connected to the outer casing 3 of the roller assembly. A fourth fire-resistant expansion strip 17 is provided inside the two upper fire-resistant edge strips 16 facing the roller shutter 1. The first fire-resistant expansion strip 13, the second fire-resistant expansion strip 14, and the fourth fire-resistant expansion strip 17 form a closed sealing ring. The fourth fire-resistant expansion strip 17 seals the gap between the roller shutter 1 and the roller assembly, preventing smoke from entering the room through the roller assembly.

[0042] The first fire-resistant expansion strip 13, the second fire-resistant expansion strip 14, the third fire-resistant expansion strip 15, and the fourth fire-resistant expansion strip 17 are graphite-based fire-resistant expansion strips with an expansion ratio of 5 to 30 times.

[0043] like Figure 5 As shown: A downward-facing elastic booster 18 is provided on the upper fireproof edge strip 16. The lower end of the roller shutter 1 is stopped by the elastic booster 18. When the roller shutter 1 rolls up, it pushes the elastic booster 18 to store force. After the coil spring in the roller assembly fails, the roller shutter 1 unfolds under the combined force of gravity and the thrust of the elastic booster 18. The elastic booster 18 can be a spring push rod, a pneumatic push rod, or a spring.

[0044] The lower end of the roller shutter 1 is equipped with a widened lower beam 19, and the second fireproof expansion strip 14 is installed on the widened lower beam 19. On the one hand, the widened lower beam 19 adds weight to the lower end of the roller shutter 1, pulling the roller shutter 1 open; on the other hand, it increases the installation area of ​​the second fireproof expansion strip 14.

[0045] Example 2 like Figure 3 As shown: In this embodiment, the low-stress temperature-sensing triggering mechanism also includes a breaker 11. The breaker 11 is linked to the fire protection system. The breaker 11 triggers the brittle thermal element 5 by receiving a signal from the fire protection system. After the fire protection system alarms, the breaker 11 breaks the brittle thermal element 5, causing the roller shutter 1 to close the window. The breaker 11 is made of an electric push rod, an electromagnetic push rod, or other components that can cause impact or knocking action, which can cause the brittle thermal element 5 to break. The breaker 11 is connected in series with the alarm light of the fire protection system. When the alarm light of the fire protection system alarms, the breaker 11 is also energized and activated.

[0046] Example 3 like Figure 7 , Figure 8 As shown: To reduce the resistance when the locking pin 9 slides out of the pin hole of the support wheel 7, the friction between the locking pin 9 and the bracket 8, and between the locking pin 9 and the support wheel 7, is designed as rolling friction. Specifically, linear bearings 20 are installed on the bracket 8 and the support wheel 7, with the locking pin 9 inserted into the linear bearings 20. Of course, the linear bearing 20 can be a separate component nested in the bracket 8 and the support wheel 7, or the balls can be directly embedded in the hole walls of the bracket 8 and the support wheel 7 to achieve the bearing function; alternatively, the balls of the linear bearing 20 can face outwards, and the linear bearing 20 can be fixedly sleeved on the locking pin 9, with the balls of the linear bearing 20 making rolling contact with the hole walls of the bracket 8 and the support wheel 7.

[0047] When linear bearing 20 is used as part of bracket 8 and support wheel 7, to prevent the locking pin 9 from being obstructed by dirt adhering to its surface, the locking pin 9 has a variable cross-section structure. The cross-section of the locking pin 9 is wide at the mating part with bracket 8 and narrows from the mating part towards the direction of the locking pin 9's disengagement. When the locking pin 9 disengages from the pin hole of support wheel 7, the transition between the locking pin 9 and bracket 8 is from the wide section to the narrow section, so even if the surface of the locking pin 9 is covered with dirt, it will not cause obstruction.

[0048] To prevent the locking pin 9 from making hard contact with the brittle thermal element 5, which could lead to accidental damage to the brittle thermal element 5, a flexible pad 21 is provided at the contact position between the locking pin 9 and the brittle thermal element 5, and a flexible pad 21 is also provided at the contact position between the locking pin 9 and the adjusting screw 12.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-stress temperature-triggered fireproof curtain, comprising a roller shutter (1), a guide rail (2), and a roller assembly; the upper end of the roller shutter (1) is connected to the roller assembly; characterized in that, The reel assembly includes: The winding section (4) is used to raise and lower the roller blind (1). The energy storage mechanism (6) drives the winding part (4) to have a winding tendency; The low-stress temperature-sensing triggering mechanism includes a brittle thermal element (5); the mechanism is configured such that: under normal conditions, the brittle thermal element (5) is subjected to a preset axial preload, thereby maintaining the locking of the energy storage mechanism (6); when the brittle thermal element (5) fails due to temperature rise, the locking of the energy storage mechanism (6) is released, allowing the roller shutter (1) to unfold.

2. The low-stress temperature-triggered fireproof curtain according to claim 1, characterized in that: The low-stress temperature-sensing triggering mechanism includes a lockable support wheel (7), a locking pin (9), and an elastic element (10) that drives the locking pin (9); the brittle thermal element (5) maintains the locking pin (9) on the support wheel (7) by resisting the driving force of the elastic element (10).

3. The low-stress temperature-triggered fireproof curtain according to claim 2, characterized in that: The winding part (4) is rotatably mounted on the outer shell (3). The support wheel (7) is coaxial with the winding part (4). One end of the support wheel (7) is rotatably connected to the winding part (4) and the other end is rotatably connected to the outer shell (3). The energy storage mechanism (6) is a coil spring and is connected between the support wheel (7) and the winding part (4).

4. The low-stress temperature-triggered fireproof curtain according to claim 3, characterized in that: The low-stress temperature-sensing triggering mechanism includes a bracket (8), which is fixedly connected to the outer shell (3). A locking pin (9) is slidably inserted into the bracket (8). The support wheel (7) has a pin hole that matches the locking pin (9). An elastic element (10) is connected between the bracket (8) and the locking pin (9). The elastic element (10) imparts a force to the locking pin (9) to disengage from the pin hole.

5. A low-stress temperature-triggered fireproof curtain according to claim 4, characterized in that: The low-stress temperature-sensing triggering mechanism also includes a breaker (11), which is linked to the fire protection system. The breaker (11) triggers the brittle thermal element (5) by receiving a signal from the fire protection system.

6. A low-stress temperature-triggered fireproof curtain according to claim 4, characterized in that: The bracket (8) is threaded with an adjusting screw (12), and the brittle thermal element (5) is located between the adjusting screw (12) and the locking pin (9).

7. The low-stress temperature-triggered fireproof curtain according to claim 1, characterized in that: The guide rail (2) is provided with a first fireproof expansion strip (13) on the front and rear sides of the roller shutter (1); the lower end of the roller shutter (1) is provided with a second fireproof expansion strip (14).

8. A low-stress temperature-triggered fireproof curtain according to claim 1, characterized in that: A third fire-resistant expansion strip (15) is provided at the connection between the curtain slats (1.1) of the roller shutter (1).

9. A low-stress temperature-triggered fireproof curtain according to claim 7, characterized in that: It also includes two upper fireproof edge strips (16), which are located on the front and rear sides of the roller shutter (1). The inner side of the two upper fireproof edge strips (16) is provided with a fourth fireproof expansion strip (17) facing the roller shutter (1). The first fireproof expansion strip (13), the second fireproof expansion strip (14), and the fourth fireproof expansion strip (17) are connected to form a closed sealing ring.

10. A low-stress temperature-triggered fireproof curtain according to claim 9, characterized in that: The upper fireproof edge strip (16) is provided with a downward elastic booster (18), and the lower end of the roller shutter (1) is stopped by the elastic booster (18). When the roller shutter (1) is rolled up, it pushes the elastic booster (18) to store power.

11. A low-stress temperature-triggered fireproof curtain according to claim 4, characterized in that: The friction between the locking pin (9) and the bracket (8), and between the locking pin (9) and the support wheel (7), is rolling friction.

12. A low-stress temperature-triggered fireproof curtain according to claim 11, characterized in that: The locking pin (9) is a variable cross-section structure. The cross-section of the mating part of the locking pin (9) and the bracket (8) is wide, and the cross-section narrows from the mating part toward the direction of disengagement of the locking pin (9).

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