A test device for the smoke resistance performance of fire doors

Abstract

This utility model relates to the technical field of fire door testing equipment, and discloses a fire door smoke prevention performance testing device, including a static pressure furnace body. A fire door specimen frame is slidably connected to the front side of the static pressure furnace body. Multiple U-shaped limiting plates are fixedly connected to the top of the static pressure furnace body. A damping shaft is rotatably connected inside the U-shaped limiting plate, and a fixing ring a is fixedly connected to the outside of the damping shaft. In this utility model, by pushing the fire door specimen frame to slide into the static pressure furnace body, a hook-shaped rotating locking plate engages with the outside of the hook-shaped fixing plate to fix the fire door specimen frame in the left and right directions. The screw slides into the inside of the U-shaped fixing plate along the damping shaft, and the rotating handle rotates the locking ring to move backward and make close contact with the U-shaped fixing plate, thereby fixing the top of the fire door specimen frame. This achieves stable installation of the fire door specimen and prevents displacement caused by high-pressure airflow impacting the door during operation, which would affect the stability of the test results.

Description

Technical Field

[0001] This utility model relates to the technical field of fire door testing equipment, and in particular to a fire door smoke prevention performance testing device. Background Technology

[0002] The fire door smoke resistance performance testing device is a specialized device used to simulate a fire smoke environment. Through a prescribed testing procedure and instruments, it measures the ability of a fire door to prevent smoke penetration when closed. It can quantify parameters such as the amount of smoke leakage through door gaps and pressure difference, providing a basis for evaluating the smoke resistance performance of fire doors.

[0003] In the existing technology, the fire door smoke prevention performance testing device is constructed by setting up a sealed test chamber, installing the fire door specimen at the opening of the chamber, applying a stable air pressure to simulate a pressure difference on one side, and using a smoke generation and detection system on the other side to monitor the smoke leakage concentration and flow rate through the door gap, and determining whether the smoke penetration prevention performance of the door meets the standard through parameter analysis.

[0004] However, in the existing technology, some fire door smoke resistance performance testing devices are cumbersome to operate when installing fire door specimens, and the stability of the fixing is poor. During the test, the specimens may shift, affecting the accuracy of the test results. Therefore, a fire door smoke resistance performance testing device is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a fire door smoke resistance performance testing device, which aims to improve the problems of cumbersome operation and poor fixation stability when installing fire door test specimens in some existing fire door smoke resistance performance testing devices, thus affecting the accuracy of test results.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a fire door smoke prevention performance testing device, comprising a static pressure furnace body, a fire door specimen frame slidably connected to the front side of the static pressure furnace body, a plurality of U-shaped limiting plates fixedly connected to the top of the static pressure furnace body, a damping shaft rotatably connected inside the U-shaped limiting plates, a fixing ring a fixedly connected to the outside of the damping shaft, a lead screw fixedly connected to the outside of the fixing ring a, a limiting plate fixedly connected to the front side of the lead screw, a rotating locking ring threadedly connected to the outside of the lead screw, a plurality of rotating handles fixedly connected to the outside of the rotating locking ring, a plurality of U-shaped fixing plates fixedly connected to the top of the fire door specimen frame, and the lead screw slidably connected to the inside of the U-shaped fixing plates.

[0007] As a further description of the above technical solution: multiple U-shaped mounting plates a are fixedly connected to the left and right sides of the fire door test specimen frame, multiple fixed shafts are fixedly connected to the left and right sides of the fire door test specimen frame, a rotating ring is rotatably connected to the outside of the fixed shaft, a hook-shaped rotating lock plate is fixedly connected to the rear side of the rotating ring, a spring a is provided on the top of the hook-shaped rotating lock plate, and the top of the spring a is located inside the U-shaped mounting plate a;

[0008] As a further description of the above technical solution: multiple U-shaped mounting plates b are fixedly connected to the left and right sides of the external static pressure furnace body, a hook-shaped fixing plate is fixedly connected to the front side of the internal part of the U-shaped mounting plate b, the hook-shaped rotating locking plate is slidably connected to the outside of the hook-shaped fixing plate, and the rear side of the U-shaped mounting plate a is slidably connected to the front side of the U-shaped mounting plate b.

[0009] As a further description of the above technical solution: the interior of the fireproof door test piece frame is rotatably connected to a fireproof door a via a door hinge, and the exterior of the static pressure furnace body is fixedly connected to a PLC cabinet;

[0010] As a further description of the above technical solution: two supporting inclined plates are fixedly connected to the front side of the fire door test piece frame, and a U-shaped base plate is fixedly connected to the bottom of the supporting inclined plates. Slide rails are slidably connected to the outside of the two U-shaped base plates.

[0011] As a further description of the above technical solution: an air inlet pipe is fixedly connected inside the static pressure furnace body, a ball-holding ring is fixedly connected outside the air inlet pipe, a fixing ring b is fixedly connected outside the ball-holding ring, a T-shaped ring is slidably connected outside the ball-holding ring, a spring b is provided on the right side of the fixing ring b, the right side of the spring b is provided on the left side of the T-shaped ring, and the outside of the fixing ring b is slidably connected inside the T-shaped ring;

[0012] As a further description of the above technical solution: the ball-placement ring has multiple ball-placement grooves inside, and a sliding ball is slidably connected inside the ball-placement groove. The external parts of the multiple sliding balls are slidably connected inside the T-shaped ring. The ball-placement ring has a fan outlet pipe slidably connected inside, and the fan outlet pipe has multiple slots inside. The internal parts of the slots are slidably connected to the external parts of the sliding balls.

[0013] As a further description of the above technical solution: a retaining ring a is fixedly connected to the inside left side of the blower outlet pipe, a retaining ring b is fixedly connected to the inside right side of the furnace body inlet pipe, the left side of the retaining ring a is slidably connected to the right side of the retaining ring b, and a test blower is fixedly connected to the outside of the blower outlet pipe.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, by pushing the fire door test specimen frame along the slide rail to the front side of the static pressure furnace body, the hook-shaped rotating locking plate, due to its special shape, engages with the outside of the hook-shaped fixing plate, thus fixing the fire door test specimen frame in the left and right directions. Then, the screw is rotated along the damping shaft, and the screw slides into the interior of the U-shaped fixing plate. Then, by rotating the handle, the rotating locking ring is rotated, causing the rotating locking ring to move backward on the screw until it is in close contact with the U-shaped fixing plate, thereby fixing the top of the fire door test specimen frame. This achieves stable installation and convenient operation of the fire door test specimen, and prevents the high-pressure airflow from impacting the door during operation and causing displacement that affects the stability of the test results.

[0016] 2. In this utility model, when connecting the gas pipeline, the blower outlet pipe is inserted into the inside of the ball-holding ring, and the T-ring is pushed to compress the spring, so that the sliding ball can slide in the ball-holding groove. When the groove on the blower outlet pipe is aligned with the sliding ball, the T-ring is released. Under the elastic force of spring b, the T-ring pushes the sliding ball into the groove, completing the locking of the pipeline. At this time, the abutment ring a and abutment ring b are used to achieve quick disassembly of the pipe fitting. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a fire door smoke prevention performance testing device proposed in this utility model;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0020] Figure 4 This is a schematic diagram of the U-shaped base plate of a fire door smoke prevention performance testing device proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the air outlet pipe of a fire door smoke prevention performance testing device proposed in this utility model.

[0022] Legend:

[0023] 1. Static pressure furnace body; 2. Fireproof door test piece frame; 3. U-shaped limiting plate; 4. Damping rotating shaft; 5. Fixing ring a; 6. Screw; 7. Limiting plate; 8. Rotary locking ring; 9. Rotating handle; 10. U-shaped fixing plate; 11. U-shaped mounting plate a; 12. Fixing shaft; 13. Rotating ring; 14. Hook-shaped rotating locking plate; 15. Spring a; 16. U-shaped mounting plate b; 17. Hook-shaped fixing plate; 18. Fireproof door a; 19. Supporting inclined plate; 20. U-shaped base plate; 21. Slide rail; 22. PLC cabinet; 23. Furnace body air inlet pipe; 24. Ball placement ring; 25. Fixing ring b; 26. T-shaped ring; 27. Spring b; 28. Sliding ball clamp; 29. ​​Ball placement groove; 30. Fan air outlet pipe; 31. Slot; 32. Abutment ring a; 33. Abutment ring b; 34. Test fan. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4This utility model provides an embodiment of a fire door smoke prevention performance testing device, comprising a static pressure furnace body 1. The static pressure furnace body 1 serves as the core container simulating a high-temperature flue gas environment during the test, providing a stable sealed space for smoke prevention performance testing. A fire door specimen frame 2 is slidably connected to the front side of the static pressure furnace body 1. The fire door specimen frame 2 is used to install the fire door specimen to be tested, achieving precise docking between the specimen and the furnace body. Multiple U-shaped limiting plates 3 are fixedly connected to the top of the static pressure furnace body 1. The U-shaped limiting plates 3 provide fixed support points for the subsequent installation of the rotating shaft and lead screw 6. A damping rotating shaft 4 is rotatably connected inside the U-shaped limiting plates 3. The damping rotating shaft 4 can rotate flexibly within the U-shaped limiting plates 3 and has a certain damping resistance, maintaining a stable position after rotation. A fixing ring a5 is fixedly connected to the outside of the damping rotating shaft 4. The fixing ring a5 is used to firmly connect the damping rotating shaft 4 and the lead screw 6. The external fixed connection is a lead screw 6, which locks the specimen frame in place through a threaded engagement. A limit plate 7 is fixedly connected to the front of the lead screw 6, which prevents the rotating locking ring 8 from falling off the front end of the lead screw 6, thus providing a limiting protection function. The external thread of the lead screw 6 is connected to the rotating locking ring 8, which moves back and forth through the threaded transmission with the lead screw 6, thereby pressing or loosening the fixed structure. The external fixed connection of the rotating locking ring 8 is multiple rotating handles 9, which make it easy for the operator to hold and rotate the rotating locking ring 8, reducing the difficulty of operation. The top of the fire door specimen frame 2 is fixedly connected to multiple U-shaped fixing plates 10, which provide a through channel for the lead screw 6 to connect the specimen frame and the lead screw 6. The external sliding connection of the lead screw 6 is inside the U-shaped fixing plate 10, allowing the lead screw 6 to pass freely within the U-shaped fixing plate 10, providing space for the locking operation.

[0026] Multiple U-shaped mounting plates a11 are fixedly connected to the left and right sides of the fire door test specimen frame 2. The U-shaped mounting plates a11 provide installation and support positions for the springs a15. Multiple fixed shafts 12 are fixedly connected to the left and right sides of the fire door test specimen frame 2. The fixed shafts 12 provide the rotation axis for the rotating rings 13, ensuring the stability of the rotating structure. The rotating rings 13 are rotatably connected to the outside of the fixed shafts 12. The rotating rings 13 can rotate flexibly around the fixed shafts 12, driving the hook-shaped rotating locking plates 14 to move synchronously. The hook-shaped rotating locking plates 14 are fixedly connected to the rear side of the rotating rings 13. The hook-shaped rotating locking plates 14 lock and fix the side of the test specimen frame by cooperating with the hook-shaped fixed plates 17. A spring a15 is provided on the top of the hook-shaped rotating locking plates 14. The spring a15 keeps the hook-shaped rotating locking plates 14 in the initial locked position through the elastic force, enhancing the connection stability. The top of the spring a15 is located inside the U-shaped mounting plates a11, so that the spring a15 is limited. The U-shaped mounting plate a11 is fixed inside to ensure the stability of the elastic force direction. Multiple U-shaped mounting plates b16 are fixedly connected to the left and right sides of the external static pressure furnace body 1. The U-shaped mounting plate b16 provides a fixed base for the hook-shaped fixing plate 17 and cooperates with the U-shaped mounting plate a11 to achieve lateral positioning. The hook-shaped fixing plate 17 is fixedly connected to the front side of the internal part of the U-shaped mounting plate b16. The hook-shaped fixing plate 17 and the hook-shaped rotating locking plate 14 hook each other to form a side fixing structure. The hook-shaped rotating locking plate 14 is slidably connected to the outside of the hook-shaped fixing plate 17, so that the hook-shaped rotating locking plate 14 can smoothly hook or detach from the hook-shaped fixing plate 17. The rear side of the U-shaped mounting plate a11 is slidably connected to the front side of the U-shaped mounting plate b16 to achieve precise docking and preliminary positioning of the specimen frame and the furnace body on the side. Through the above structural cooperation, the stable installation and convenient operation of the fire door specimen are achieved, and the displacement caused by the high-pressure airflow during operation is prevented from affecting the stability of the test results.

[0027] Reference Figure 1 , Figure 4 , Figure 5The static pressure furnace body 1 is internally fixedly connected to an air inlet pipe 23, which is used to introduce test gas into the static pressure furnace body 1. An externally fixed ball-holding ring 24 is fixedly connected to the externally of the air inlet pipe 23. The ball-holding ring 24 provides installation space and limits the sliding ball 28. An externally fixed ring b25 is fixedly connected to the externally of the ball-holding ring 24. The fixed ring b25 provides a support point for the spring b27 and limits the sliding range of the T-ring 26. An externally slidably connected T-ring 26 is attached to the externally of the ball-holding ring 24. The T-ring 26, under the action of the spring, compresses the sliding ball 28, keeping it locked. A spring b27 is located on the right side of the fixed ring b25, providing continuous elastic force to the T-ring 26 to ensure the locking effect of the sliding ball 28. The right side of the spring b27 is located on the left side of the T-ring 26, allowing the spring b27 to push the T-ring 26 to the right. The externally slidably connected fixed ring b25 is inside the T-ring 26. The T-ring 26 slides smoothly along the axial direction of the fixed ring b25. The ball-placement ring 24 has multiple ball-placement grooves 29 inside, which are used to accommodate and limit the sliding ball 28 to prevent it from falling off. The ball-placement groove 29 is slidably connected to the sliding ball 28 inside. The sliding ball 28 is fixedly connected to the air inlet pipe and the air outlet pipe by being inserted into the slot 31. The external parts of the multiple sliding balls 28 are slidably connected to the inside of the T-ring 26, so that the T-ring 26 can squeeze the sliding balls 28 to shrink towards the center. The ball-placement ring 24 is slidably connected to the inside of the blower air outlet pipe 30, which is used to transport the gas generated by the test blower 34 to the furnace body air inlet pipe 23. The blower air outlet pipe 30 has multiple slots 31 inside. The slots 31 cooperate with the sliding balls 28 to form a locking structure to realize the quick connection of the pipe. The internal parts of the slots 31 are slidably connected to the outside of the sliding balls 28, so that the sliding balls 28 can be inserted into the slots 31 to fix the pipe.

[0028] A retaining ring a32 is fixedly connected to the inside left side of the blower outlet pipe 30. The retaining ring a32 and retaining ring b33 cooperate to enhance the sealing of the pipe connection. A retaining ring b33 is fixedly connected to the inside right side of the furnace body inlet pipe 23. The retaining ring b33 is in close contact with the retaining ring a32 to prevent gas leakage. The left side of the retaining ring a32 is slidably connected to the right side of the retaining ring b33 to ensure that the two retaining rings fit tightly. A test blower 34 is fixedly connected to the outside of the blower outlet pipe 30. The test blower 34 provides a stable airflow for the test and simulates the flue gas flow state under different working conditions. Through the above structural cooperation, the pipe fittings can be quickly disassembled.

[0029] Reference Figure 1 , Figure 4The interior of the fire door test specimen frame 2 is connected to a fire door a18 via a hinge. The fire door a18 simulates the state of a fire door in actual use and is used for smoke prevention performance testing. The external of the static pressure furnace body 1 is fixedly connected to a PLC cabinet 22. The PLC cabinet 22 serves as the control core and can realize the setting of test parameters, data acquisition, and automated control. The front of the fire door test specimen frame 2 is fixedly connected to two support inclined plates 19. The support inclined plates 19 transfer the weight of the test specimen frame to the U-shaped base plate 20, which serves as a load-bearing and connecting element. The bottom of the support inclined plates 19 is fixedly connected to the U-shaped base plate 20. The U-shaped base plate 20 cooperates with the slide rail 21 to achieve smooth sliding of the test specimen frame. The two U-shaped base plates 20 are externally slidably connected to the slide rail 21. The slide rail 21 provides a sliding track for the U-shaped base plate 20, reducing the friction when the test specimen frame moves.

[0030] Working principle: First, the fire door to be tested, a18, is installed inside the fire door test piece frame 2 via a door hinge, completing the initial assembly of the fire door test piece. Simultaneously, it is ensured that the fire door a18 can rotate normally within the fire door test piece frame 2, preparing the test piece for subsequent tests. The fire door test piece frame 2 is then pushed, causing its bottom U-shaped base plate 20 to slide on the slide rail 21, moving the entire fire door test piece frame 2 closer to the static pressure furnace body 1. During the movement, the supporting inclined plate 19 provides stable support, ensuring a smooth movement. When the fire door test piece frame 2 moves to the position corresponding to the front side of the static pressure furnace body 1, the U-shaped fixing plate 10 at the top of the fire door test piece frame 2 is fitted onto the outside of the screw rod 6 connected to the inner damping shaft 4 and outer fixing ring a5 of the U-shaped limiting plate 3 at the top of the static pressure furnace body 1, completing the initial connection. The screw rod 6 at the top of the static pressure furnace body 1 is then rotated... The rotating locking ring 8 with the threaded connection is moved backward along the screw 6 by rotating the handle 9 until it is tightly pressed against the front side of the U-shaped fixing plate 10. Under the limiting action of the limiting plate 7, the U-shaped fixing plate 10 is firmly fixed, thereby locking the top of the fire door test piece frame 2 to the static pressure furnace body 1. At the same time, the rear side of the U-shaped mounting plates a11 on the left and right sides of the fire door test piece frame 2 slides into the front side of the U-shaped mounting plates b16 on the left and right sides of the static pressure furnace body 1. Rotating the outer rotating ring 13 of the fixing shaft 12 causes the hook-shaped rotating locking plate 14 to rotate and hook the hook-shaped fixing plate 17 inside the U-shaped mounting plate b16. Under the elastic force of the spring a15, the hook-shaped rotating locking plate 14 is tightly attached to the hook-shaped fixing plate 17, further locking and fixing the fire door test piece frame 2 to the static pressure furnace body 1 from the left and right sides, ensuring that the connection between the two is stable during the test.

[0031] Insert the blower outlet pipe 30 into the furnace inlet pipe 23 inside the static pressure furnace body 1, so that the blower outlet pipe 30 is slidably connected inside the ball-holding ring 24. The inner wall of the blower outlet pipe 30 compresses the sliding ball 28, and the sliding ball 28 moves outward in the ball-holding groove 29 of the ball-holding ring 24, pushing the T-ring 26 to compress the spring b27. When the groove 31 inside the blower outlet pipe 30 moves to the position corresponding to the sliding ball 28, the elastic force of the spring b27 pushes... The moving T-ring 26 resets, and the inner wall of the T-ring 26 presses against the sliding ball 28, causing the sliding ball 28 to engage in the slot 31, thus achieving a tight connection between the furnace body air inlet pipe 23 and the blower air outlet pipe 30. Simultaneously, the abutment ring a32 inside the blower air outlet pipe 30 and the abutment ring b33 inside the furnace body air inlet pipe 23 fit tightly together, enhancing the sealing of the connection. After all connections are completed and fixed, test parameters are set through the PLC cabinet 22 outside the static pressure furnace body 1, and the measurement is controlled. The test fan 34 is started, and the test fan 34 delivers gas into the static pressure furnace 1 through the fan outlet pipe 30 and the furnace inlet pipe 23. The fire door a18 is closed. The sealing performance of each part of the device is used to simulate the smoke prevention scenario in actual use of the fire door. The PLC cabinet 22 monitors and records various data during the test to complete the fire door smoke prevention performance test. After the test, the rotating locking ring 8 is rotated in the opposite direction to loosen the fixation of the U-shaped fixing plate 10. The hook-shaped rotating locking plate 14 is rotated to disengage it from the hook-shaped fixing plate 17, and the left and right sides are released from locking. The T-shaped ring 26 is pulled to compress the spring b27, so that the sliding ball 28 is disengaged from the slot 31. The fan outlet pipe 30 is pulled out from the furnace inlet pipe 23. The fire door test piece frame 2 is pushed forward along the slide rail 21 to separate it from the static pressure furnace 1. Finally, the fire door a18 is taken out from the fire door test piece frame 2, completing the disassembly work of the entire test process.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the smoke resistance of fire doors, comprising a static pressure furnace (1), characterised in that: The front side of the static pressure furnace body (1) is slidably connected to a fireproof door test piece frame (2). The top of the static pressure furnace body (1) is fixedly connected to multiple U-shaped limiting plates (3). The inside of the U-shaped limiting plate (3) is rotatably connected to a damping shaft (4). The outside of the damping shaft (4) is fixedly connected to a fixing ring a (5). The outside of the fixing ring a (5) is fixedly connected to a lead screw (6). The front side of the lead screw (6) is fixedly connected to a limiting plate (7). The outside of the lead screw (6) is threadedly connected to a rotating locking ring (8). The outside of the rotating locking ring (8) is fixedly connected to multiple rotating handles (9). The top of the fireproof door test piece frame (2) is fixedly connected to multiple U-shaped fixing plates (10). The outside of the lead screw (6) is slidably connected to the inside of the U-shaped fixing plate (10).

2. The fire door smoke resistance performance test device according to claim 1, characterized in that: Multiple U-shaped mounting plates a (11) are fixedly connected to the left and right sides of the fire door test specimen frame (2). Multiple fixed shafts (12) are fixedly connected to the left and right sides of the fire door test specimen frame (2). A rotating ring (13) is rotatably connected to the outside of the fixed shaft (12). A hook-shaped rotating lock plate (14) is fixedly connected to the rear side of the rotating ring (13). A spring a (15) is provided on the top of the hook-shaped rotating lock plate (14). The top of the spring a (15) is located inside the U-shaped mounting plate a (11).

3. The fire door smoke resistance performance test device according to claim 2, characterized in that: Multiple U-shaped mounting plates b (16) are fixedly connected to the left and right sides of the static pressure furnace body (1). A hook-shaped fixing plate (17) is fixedly connected to the front side of the U-shaped mounting plate b (16). The hook-shaped rotating locking plate (14) is slidably connected to the outside of the hook-shaped fixing plate (17). The rear side of the U-shaped mounting plate a (11) is slidably connected to the front side of the U-shaped mounting plate b (16).

4. The fire door smoke resistance performance test device of claim 1, wherein: The fire door test piece frame (2) is internally connected to a fire door a (18) via a door hinge, and the static pressure furnace body (1) is externally fixedly connected to a PLC cabinet (22).

5. The fire door smoke control performance testing apparatus of claim 1, wherein: The front side of the fire door test piece frame (2) is fixedly connected to two support inclined plates (19), and the bottom of the support inclined plates (19) is fixedly connected to a U-shaped base plate (20). The two U-shaped base plates (20) are slidably connected to a slide rail (21).

6. The fire door smoke resistance performance test device of claim 1, wherein: The static pressure furnace body (1) is fixedly connected to the furnace body air inlet pipe (23), and the furnace body air inlet pipe (23) is fixedly connected to the outside of the furnace body air inlet pipe (23). The ball-placed ring (24) is fixedly connected to the outside of the ball-placed ring (24), and the ball-placed ring (24) is slidably connected to the outside of the ball-placed ring (24). A spring (27) is provided on the right side of the fixed ring (25), and the right side of the spring (27) is provided on the left side of the T-shaped ring (26). The outside of the fixed ring (25) is slidably connected to the inside of the T-shaped ring (26).

7. The fire door smoke resistance performance test device of claim 6, wherein: The ball-placement ring (24) has multiple ball-placement grooves (29) inside, and a sliding ball (28) is slidably connected inside the ball-placement groove (29). The external parts of the multiple sliding balls (28) are slidably connected inside the T-shaped ring (26). The ball-placement ring (24) has a fan outlet pipe (30) slidably connected inside, and the fan outlet pipe (30) has multiple slots (31) inside. The internal parts of the slots (31) are slidably connected to the external parts of the sliding balls (28).

8. The fire door smoke resistance performance test device according to claim 7, characterized in that: A stop ring a (32) is fixedly connected to the inside left side of the blower outlet pipe (30), a stop ring b (33) is fixedly connected to the inside right side of the furnace body inlet pipe (23), the left side of the stop ring a (32) is slidably connected to the right side of the stop ring b (33), and a test blower (34) is fixedly connected to the outside of the blower outlet pipe (30).

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