A pressure fatigue testing device for fire extinguishers

Abstract

This utility model discloses a pressure fatigue testing device for fire extinguishers, relating to the technical field of fire extinguisher devices. The base has a slide rail in the middle, with mounting seats at both ends. An electric push rod is mounted on the upper part of each mounting seat, and a push plate is connected to the free end of each of the two electric push rods. A slider adapted to the slide rail is located at the bottom of the push plate, and several arc-shaped pressure plates adapted to the fire extinguisher are located on the outer side of the push plate. The electric push rod provides a stable and adjustable clamping force, avoiding uneven manual clamping force that could cause the fire extinguisher to shift during the pressure cycle test, ensuring that the fire extinguisher remains in the preset testing position throughout the test, thus improving the accuracy of pressure loading. The cooperation between the slide rail and the slider ensures the straightness of the push plate's movement trajectory, preventing uneven contact between the pressure plate and the fire extinguisher shell due to push plate tilting. Furthermore, the design of multiple arc-shaped pressure plates can accommodate fire extinguishers of different diameters, improving testing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of fire extinguisher devices, specifically to a fire extinguisher pressure fatigue testing device. Background Technology

[0002] As an important fire emergency equipment, fire extinguishers are subject to fatigue damage to their shells and internal pressure components during long-term storage, transportation and use due to repeated pressure fluctuations (such as pressure rise and fall caused by temperature changes, pressure shocks after multiple fillings, etc.). If the fatigue strength does not meet the standards, it may cause safety hazards such as shell rupture and pressure leakage.

[0003] Currently, existing fire extinguisher pressure fatigue testing devices have the following shortcomings: the clamping components of traditional devices are only compatible with a single specification of fire extinguisher, and the clamps need to be frequently disassembled and replaced when changing fire extinguishers of different diameters, which is cumbersome and has low testing efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a fire extinguisher pressure fatigue testing device that meets the testing needs of fire extinguishers of various diameters and greatly improves the testing efficiency, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A pressure fatigue testing device for fire extinguishers includes a base, a slide rail in the middle of the base, mounting seats at both ends of the slide rail, an electric push rod on the upper part of the mounting seat, a push plate connected to the free end of each of the two electric push rods, a slider adapted to the slide rail at the bottom of the push plate, and several arc-shaped pressure plates adapted to fire extinguishers on the outer side of the push plate.

[0007] As an improved technical solution, the slide rail is provided with a slide rod, and the slider is provided with a slide hole adapted to the slide rod.

[0008] As an improved technical solution, an elastic pad is provided on the outer side of the pressure plate.

[0009] As an improved technical solution, the upper part of the base is provided with a fixing seat, and the interior of the fixing seat is provided with a circular fixing cavity adapted to the fire extinguisher.

[0010] As an improved technical solution, the fixed base and the mounting base are respectively fixedly connected to the base by bolts.

[0011] As an improved technical solution, the inner wall of the fixed cavity is provided with several connecting rods, the outer side of the connecting rods is provided with a sleeve, the free end of the sleeve is provided with a fixing plate adapted to the fire extinguisher, and the outer side of the sleeve is provided with a spring.

[0012] As an improved technical solution, the inner side of the sleeve is provided with an anti-detachment groove, and the top of the connecting rod is provided with a stop block adapted to the anti-detachment groove.

[0013] As a preferred technical solution, the upper part of the base is provided with several columns, and a baffle is provided through the several columns. The baffle has a fixing hole in the middle that is adapted to the top of the fire extinguisher.

[0014] As a preferred technical solution, the baffle is provided with a number of weight-reducing holes.

[0015] As a preferred technical solution, the base is provided with a plurality of screws that penetrate the baffle, and the upper part of the baffle is provided with nuts that are compatible with the screws.

[0016] As a preferred technical solution, the nut is provided with a handle on its outer side.

[0017] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] This utility model discloses a pressure fatigue testing device for fire extinguishers, comprising a base, a slide rail in the middle of the base, mounting seats at both ends of the slide rail, an electric push rod on the upper part of the mounting seat, a push plate connected to the free end of each of the two electric push rods, a slider adapted to the slide rail at the bottom of the push plate, and several arc-shaped pressure plates adapted to the fire extinguisher on the outer side of the push plate. The push plate, driven by an electric push rod, slides along a track, and in conjunction with the arc-shaped pressure plate, clamps and fixes the fire extinguisher. On the one hand, the electric push rod provides a stable and adjustable clamping force, avoiding uneven clamping force caused by manual clamping that could lead to displacement of the fire extinguisher during pressure cycling tests. This ensures that the fire extinguisher remains in the preset testing position throughout the test, improving the accuracy of pressure loading. On the other hand, the cooperation between the track and the slider ensures the linearity of the push plate's movement trajectory, preventing uneven contact between the pressure plate and the fire extinguisher shell caused by the push plate tilting. Furthermore, the design of multiple arc-shaped pressure plates can accommodate fire extinguishers of different diameters (achieved by adjusting the distance between the push plates), eliminating the need for frequent replacement of clamping components. This significantly improves the device's adaptability to various fire extinguisher specifications, reduces test preparation time, and increases testing efficiency.

[0019] The slide rail of this invention is provided with a slide rod, and the slider is provided with a sliding hole that matches the slide rod. The precise fit between the slide rod and the sliding hole provides clear guiding constraints for the movement of the slider within the slide rail, completely avoiding the lateral offset or wobbling problems that may occur when the slider is limited solely by the side wall of the slide rail in traditional methods.

[0020] An elastic pad is provided on the outer side of the pressure plate. The elastic pad serves several purposes: First, its deformation characteristics allow for flexible contact between the pressure plate and the fire extinguisher casing, preventing direct rigid collision or compression between the metal pressure plate and the casing. This effectively prevents physical damage such as scratches and dents during testing, ensuring the fire extinguisher remains in good condition after inspection. Second, the elastic pad fills the small gaps between the pressure plate and the fire extinguisher casing, enhancing clamping tightness. Even with slight unevenness in the casing (such as welding marks or coating thickness differences), the elastic pad can conform to the surface through deformation, preventing minor wobbling during pressure cycling or vibration simulation experiments due to clamping gaps, further ensuring the accuracy of experimental data. Third, the elastic pad provides cushioning; when the fire extinguisher vibrates slightly due to pressure fluctuations during testing, it absorbs some vibration energy, reducing the impact of vibration on the clamping structure and extending the device's lifespan.

[0021] The upper part of the base is equipped with a fixing seat, and the interior of the fixing seat has a circular fixing cavity adapted to the fire extinguisher. The design of the fixing seat and the circular fixing cavity provides bottom positioning support for the fire extinguisher, forming a dual fixing structure of "bottom positioning + lateral fixing" with the lateral clamping of the push plate and pressure plate, completely solving the problem of bottom displacement of the fire extinguisher that may occur when relying solely on lateral clamping; the size of the circular fixing cavity is adapted to the bottom of the fire extinguisher, which can accurately position the fire extinguisher and ensure that the axis of the fire extinguisher is consistent with the axis of the air inlet of the pressure supply system during each test, avoiding uneven pressure loading caused by the fire extinguisher's eccentric installation, which would affect the consistency of fatigue test results.

[0022] The fixed base and the mounting base are respectively fixedly connected to the base by bolts. The bolted connection has strong fastness, which can ensure that the fixed base and the mounting base will not loosen or shift during the experiment, ensuring the stability of the clamping structure and positioning structure, and thus avoiding experimental errors caused by loose parts. In addition, the bolted connection facilitates the maintenance and repair of the device. When the fixed base or the mounting base has problems such as wear or deformation, the damaged parts can be disassembled and replaced individually without replacing the entire base or other structures, thus reducing maintenance costs.

[0023] The inner wall of the fixed cavity is provided with several connecting rods, and a sleeve is slidably provided on the outer side of each connecting rod. The free end of the sleeve is provided with a fixing plate adapted to the fire extinguisher, and a spring is provided on the outer side of the sleeve. Through the combination of "connecting rods + sleeve + spring + fixing plate," an adaptive bottom clamping mechanism is formed. First, the elastic force of the spring can drive the fixing plate to automatically conform to the outer wall of the bottom of the fire extinguisher. Regardless of slight deviations in the diameter of the bottom of the fire extinguisher or slight irregularities in its shape, the fixing plate can flexibly adjust its position under the action of the spring, achieving a tight wrapping fixation of the bottom of the fire extinguisher. Compared with the rigid positioning of traditional fixed cavities, this further improves the adaptability and stability of the bottom fixation. Second, when the fire extinguisher undergoes slight axial expansion or contraction due to pressure changes during the experiment, the spring can absorb this slight displacement through its own extension and contraction, avoiding additional constraint stress on the bottom of the fire extinguisher caused by the rigid fixed cavity. In addition, this structure can also play a certain buffering role, reducing the impact of vibration on the bottom of the fire extinguisher during testing, while preventing vibration from being transmitted to the fixing seat and base, enhancing the overall device's vibration resistance.

[0024] The inner side of the sleeve is provided with an anti-detachment groove, and the top of the connecting rod is provided with a stop block that adapts to the anti-detachment groove. The cooperative design of the anti-detachment groove and the stop block can effectively prevent the sleeve from falling off the connecting rod during sliding. The stop block can be locked in the anti-detachment groove, limiting the maximum sliding distance of the sleeve and avoiding damage or safety hazards caused by improper operation (such as excessive force) such as the sleeve detaching from the connecting rod, resulting in the fixed plate falling off, the spring being lost, etc., thus ensuring the structural integrity of the device. Secondly, during the experiment, when the spring undergoes violent expansion and contraction due to vibration or pressure fluctuations, the limiting effect of the stop block and the anti-detachment groove can ensure that the sleeve always slides along the axis of the connecting rod, preventing the fixed plate from tilting due to sleeve displacement, which would affect the fixing effect on the bottom of the fire extinguisher and ensure that the bottom clamping mechanism maintains a stable working state throughout the experiment.

[0025] The upper part of the base is provided with several columns, and a baffle is provided through several columns. The baffle has a fixing hole in the middle that is adapted to the top of the fire extinguisher. The combination of the column and baffle provides top positioning for the fire extinguisher, forming a three-dimensional "bottom-side-top" fixing structure with the bottom positioning of the bottom fixing seat and the lateral clamping of the push plate and pressure plate. This completely solves the problem of top displacement of the fire extinguisher that may occur when relying solely on bottom and side fixing. The fixing hole in the middle of the baffle matches the top of the fire extinguisher, allowing for precise positioning of the top and ensuring that the fire extinguisher remains vertical throughout the experiment. This prevents the air inlet of the pressure supply system from becoming loose and causing a leak at the connection between the air inlet and the fire extinguisher valve due to top tilting. At the same time, the fixing hole also restricts the axial displacement of the fire extinguisher. When the pressure supply system is subjected to high pressure, the fire extinguisher may generate a small upward thrust due to the increased internal pressure. The fixing hole prevents the fire extinguisher from moving upward, ensuring that the air inlet and valve are always tightly connected, preventing the experiment from being interrupted or the pressure from dropping suddenly due to interface detachment. In addition, the baffle also provides a certain degree of protection. If the top component of the fire extinguisher falls off due to fatigue damage during the experiment, the baffle can prevent the falling component from splashing, reducing safety risks.

[0026] The baffle is equipped with several weight-reduction holes. These holes significantly reduce the overall weight of the baffle, thus reducing the load on the columns and extending their lifespan. Furthermore, the reduced weight makes adjusting the baffle height easier and less strenuous for operators. Secondly, the weight-reduction holes increase ventilation. When the multi-parameter simulation chamber is adjusting temperature and humidity, air can circulate through the holes, preventing the formation of localized enclosed spaces below the baffle that could lead to uneven temperature and humidity distribution and affect the accuracy of experimental parameters. Finally, the weight-reduction holes reduce material costs and prevent excessive weight from causing installation difficulties, thus improving the practicality and economy of the device.

[0027] The base is equipped with several screws that pass through the baffle, and the upper part of the baffle is equipped with nuts that are compatible with the screws. The screw and nut design enables adjustable baffle height. First, rotating the nut moves the baffle up and down along the screws, thus adjusting the baffle height to accommodate fire extinguishers of different heights. This eliminates the need to replace baffles or posts of different heights, significantly improving the device's adaptability to various fire extinguisher sizes. Second, the threaded connection between the screw and nut is self-locking. When the baffle is adjusted to the desired height, the nut automatically locks the baffle position, preventing it from sliding or rising due to vibration or accidental contact during testing, ensuring accurate positioning of the top fixing hole on the top of the fire extinguisher. Furthermore, this structure offers high height adjustment precision, allowing for precise adjustment of the baffle position according to the fire extinguisher height, ensuring a perfect fit between the fixing hole and the top of the fire extinguisher, preventing the top fixation from being too loose or too tight due to height deviation. Simultaneously, the screw and nut structure is simple and reliable, with low maintenance costs. Compared to electric lifting structures, it eliminates problems such as motor failure and circuit damage, improving the device's reliability and durability.

[0028] The nut has a handle on its outer side. This handle greatly simplifies the adjustment of the baffle height. Workers can rotate the nut manually without using wrenches, pliers, or other tools, thus adjusting the baffle height. This is especially beneficial when frequently changing fire extinguishers of different heights during experiments, significantly reducing adjustment time and improving efficiency. Secondly, the handle increases the torque during rotation, reducing the effort required for operation. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0031] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0032] Figure 3 This is a cross-sectional view from another direction of an embodiment of the present utility model;

[0033] Figure 4 This is an exploded view of an embodiment of the present utility model;

[0034] Figure 5 yes Figure 2 Enlarged view of point A in the middle;

[0035] The components are as follows: 1. Base; 2. Slide rail; 3. Mounting seat; 4. Electric push rod; 5. Push plate; 6. Slider; 7. Fire extinguisher; 8. Pressure plate; 9. Elastic pad; 10. Fixed seat; 11. Fixed cavity; 12. Connecting rod; 13. Sleeve; 14. Fixed plate; 15. Spring; 16. Anti-detachment groove; 17. Stop block; 18. Column; 19. Baffle; 20. Fixed hole; 21. Weight reduction hole; 22. Screw; 23. Nut; 24. Handle; 25. Slide rod; 26. Slide hole. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] like Figure 1-5 As shown, a fire extinguisher pressure fatigue testing device includes a base 1, a slide 2 in the middle of the base 1, mounting seats 3 at both ends of the slide 2, an electric push rod 4 on the upper part of the mounting seat 3, a push plate 5 connected to the free end of each of the two electric push rods 4, a slider 6 adapted to the slide 2 at the bottom of the push plate 5, and several arc-shaped pressure plates 8 adapted to the fire extinguisher 7 on the outer side of the push plate 5. The electric push rod 4 drives the push plate 5 to slide along the slide rail 2, which, together with the arc-shaped pressure plate 8, clamps and fixes the fire extinguisher 7. On the one hand, the electric push rod 4 can provide a stable and adjustable clamping force, avoiding uneven manual clamping force that could cause the fire extinguisher 7 to shift during the pressure cycle test, ensuring that the fire extinguisher 7 is always in the preset detection position during the test, thus improving the accuracy of pressure loading. On the other hand, the cooperation between the slide rail 2 and the slider 6 ensures the straightness of the push plate 5's movement trajectory, preventing the push plate 5 from tilting and causing uneven contact between the pressure plate 8 and the fire extinguisher 7's shell. At the same time, the design of multiple arc-shaped pressure plates 8 can accommodate fire extinguishers 7 of different diameters (achieved by adjusting the spacing of the push plates 5), eliminating the need for frequent replacement of clamping components, significantly improving the device's adaptability to multiple specifications of fire extinguishers 7, reducing test preparation time, and improving testing efficiency.

[0038] The slide rail 2 is provided with a slide rod 25, and the slider 6 is provided with a sliding hole 26 that is adapted to the slide rod. Through the precise cooperation between the slide rod 25 and the sliding hole 26, a clear guiding constraint is provided for the movement of the slider 6 in the slide rail 2, which completely avoids the problem of left and right deviation or wobbling that may occur when the slider 6 is limited by the side wall of the slide rail 2 in the traditional way.

[0039] An elastic pad 9 is provided on the outer side of the pressure plate 8. The elastic pad 9 serves several purposes: First, its deformation characteristics allow for flexible contact between the pressure plate 8 and the fire extinguisher 7 shell, preventing direct rigid collision or compression between the metal pressure plate 8 and the fire extinguisher 7 shell. This effectively prevents physical damage such as scratches and dents caused by the pressure plate 8 during testing, ensuring the fire extinguisher 7 maintains its intact appearance after testing. Second, the elastic pad 9 fills the small gaps between the pressure plate 8 and the fire extinguisher 7 shell, enhancing the clamping tightness. Even if the fire extinguisher 7 shell has slight unevenness (such as welding marks or coating thickness differences), the elastic pad 9 can conform to the shell surface through its own deformation, preventing slight shaking of the fire extinguisher 7 during pressure cycling or vibration simulation experiments due to clamping gaps, further ensuring the accuracy of experimental data. Furthermore, the elastic pad 9 also provides a certain buffering effect. When the fire extinguisher 7 vibrates slightly due to pressure fluctuations during the experiment, the elastic pad 9 can absorb some of the vibration energy, reducing the impact of vibration on the clamping structure and extending the service life of the device.

[0040] The upper part of the base 1 is provided with a fixing seat 10, and the interior of the fixing seat 10 is provided with a circular fixing cavity 11 adapted to the fire extinguisher 7. The design of the fixing seat 10 and the circular fixing cavity 11 provides bottom positioning support for the fire extinguisher 7, forming a dual fixing structure of "bottom positioning + lateral fixing" with the lateral clamping of the push plate 5 and the pressure plate 8, which completely solves the problem of bottom displacement of the fire extinguisher 7 that may occur when relying solely on lateral clamping; the size of the circular fixing cavity 11 is adapted to the bottom of the fire extinguisher 7, which can accurately position the fire extinguisher 7 and ensure that the axis of the fire extinguisher 7 is consistent with the axis of the air inlet of the pressure supply system during each experiment, avoiding uneven pressure loading due to the eccentric installation of the fire extinguisher 7, which in turn affects the consistency of fatigue test results.

[0041] The fixed base 10 and the mounting base 3 are respectively fixedly connected to the base 1 by bolts. The bolt connection has strong fastness, which can ensure that the fixed base 10 and the mounting base 3 will not loosen or shift during the experiment, ensuring the stability of the clamping structure and the positioning structure, and thus avoiding experimental errors caused by loose parts. In addition, the bolt connection facilitates the maintenance and repair of the device. When the fixed base 10 or the mounting base 3 has problems such as wear or deformation, the damaged parts can be disassembled and replaced individually without replacing the entire base 1 or other structures, thus reducing maintenance costs.

[0042] The inner wall of the fixed cavity 11 is provided with a plurality of connecting rods 12, and a sleeve 13 is slidably provided on the outer side of the connecting rods 12. The free end of the sleeve 13 is provided with a fixing plate 14 adapted to the fire extinguisher 7, and a spring 15 is provided on the outer side of the sleeve 13. The combination of "connecting rod 12 + sleeve 13 + spring 15 + fixing plate 14" forms an adaptive bottom clamping mechanism. First, the elastic force of spring 15 can drive fixing plate 14 to automatically fit against the bottom outer wall of fire extinguisher 7. Regardless of the slight deviation in the bottom diameter of fire extinguisher 7 or the slight irregularity in the bottom shape, fixing plate 14 can flexibly adjust its position under the action of spring 15 to achieve a tight wrapping fixation of the bottom of fire extinguisher 7. Compared with the rigid positioning of traditional fixing cavity 11, the adaptability and stability of bottom fixation are further improved. Second, when fire extinguisher 7 undergoes slight axial expansion or contraction due to pressure changes during the experiment, spring 15 can absorb this slight displacement through its own extension and contraction, avoiding additional constraint stress on the bottom of fire extinguisher 7 caused by rigid fixing cavity 11. In addition, this structure can also play a certain buffering role, reducing the impact of vibration on the bottom of fire extinguisher 7 during the test, while preventing vibration from being transmitted to fixing seat 10 and base 1, thus enhancing the overall device's vibration resistance.

[0043] The inner side of the sleeve 13 is provided with an anti-detachment groove 16, and the top of the connecting rod 12 is provided with a stop block 17 that is adapted to the anti-detachment groove 16. The cooperative design of the anti-detachment groove 16 and the stop block 17 can effectively prevent the sleeve 13 from falling off the connecting rod 12 during sliding. The stop block 17 can be locked in the anti-detachment groove 16, limiting the maximum sliding distance of the sleeve 13, avoiding the sleeve 13 from falling off the connecting rod 12 due to improper operation (such as excessive force), which could cause damage to components such as the fixing plate 14 falling off or the spring 15 being lost, or safety hazards, thus ensuring the structural integrity of the device. Secondly, during the experiment, when the spring 15 undergoes violent expansion and contraction due to vibration or pressure fluctuations, the limiting effect of the stop block 17 and the anti-detachment groove 16 can ensure that the sleeve 13 always slides along the axis of the connecting rod 12, preventing the sleeve 13 from shifting and causing the fixing plate 14 to tilt, which would affect the fixing effect on the bottom of the fire extinguisher 7, and ensuring that the bottom clamping mechanism maintains a stable working state throughout the experiment.

[0044] The upper part of the base 1 is provided with several columns 18, and a baffle 19 is provided through the columns 18. The middle of the baffle 19 has a fixing hole 20 that is adapted to the top of the fire extinguisher 7. The combination of the columns 18 and the baffle 19 provides top positioning for the fire extinguisher 7. Together with the bottom positioning of the bottom fixing seat 10 and the lateral clamping of the push plate 5 and the pressure plate 8, it forms a three-dimensional fixing structure of "bottom-side-top", which completely solves the problem of top displacement of the fire extinguisher 7 that may occur if only bottom and side fixing is used. The fixing hole 20 in the middle of the baffle 19 is adapted to the top of the fire extinguisher 7, which can accurately position the top of the fire extinguisher 7 and ensure that the fire extinguisher 7 remains vertical during the experiment. This avoids the air inlet of the pressure supply system from interfering with the valve of the fire extinguisher 7 due to top tilting. The door joint is not properly sealed; at the same time, the fixing hole 20 can also limit the axial displacement of the fire extinguisher 7. When the pressure supply system is subjected to high pressure, the fire extinguisher 7 may generate a small upward thrust due to the increase in internal pressure. The fixing hole 20 can prevent the fire extinguisher 7 from moving upward, ensuring that the air inlet interface and the valve are always tightly connected, avoiding the interruption of the experiment or a sudden drop in pressure due to the interface detachment; in addition, the baffle 19 can also play a certain protective role. If the top part of the fire extinguisher 7 falls off due to fatigue damage during the experiment, the baffle 19 can prevent the falling part from splashing, reducing the safety risk.

[0045] The baffle 19 is provided with several weight-reducing holes 21. The weight-reducing holes 21 on the baffle 19 firstly significantly reduce the overall weight of the baffle 19, thereby reducing the load on the column 18 and extending its service life. Secondly, the reduced weight of the baffle 19 makes adjusting its height easier and less strenuous for operators. Thirdly, the weight-reducing holes 21 increase the ventilation of the baffle 19. When the multi-parameter simulation chamber is adjusting temperature and humidity, air can circulate vertically through the weight-reducing holes 21, preventing the formation of localized enclosed spaces below the baffle 19, which could lead to uneven temperature and humidity distribution and affect the accuracy of experimental environmental parameters. Furthermore, the weight-reducing holes 21 also reduce material costs and prevent the baffle 19 from being too heavy, thus improving the practicality and economy of the device.

[0046] The base 1 is provided with several screws 22 passing through the baffle 19, and the upper part of the baffle 19 is provided with nuts 23 that are adapted to the screws 22. The design of the screws 22 and nuts 23 enables the height of the baffle 19 to be adjustable. First, by rotating the nuts 23, the baffle 19 can be moved up and down along the screws 22, thereby adjusting the height of the baffle 19 to accommodate fire extinguishers 7 of different heights. There is no need to replace the baffles 19 or the uprights 18 of different heights, which greatly improves the compatibility of the device with fire extinguishers 7 of various sizes. Second, the threaded connection between the screws 22 and the nuts 23 has self-locking properties. When the baffle 19 is adjusted to the required height, the nuts 23 can automatically lock the position of the baffle 19 to prevent the baffle 19 from being... During the experiment, the device may slide or rise due to vibration or accidental contact, ensuring that the top fixing hole 20 is always accurately positioned on the top of the fire extinguisher 7. In addition, the structure has high height adjustment precision, and the position of the baffle 19 can be precisely adjusted according to the height of the fire extinguisher 7 to ensure that the fixing hole 20 fits perfectly with the top of the fire extinguisher 7, avoiding the top fixing being too loose or too tight due to height deviation. At the same time, the screw 22 and nut 23 have a simple and reliable structure with low maintenance costs. Compared with the electric lifting structure, there are no problems such as motor failure or circuit damage, which improves the reliability and durability of the device.

[0047] A handle 24 is provided on the outside of the nut 23. The handle 24 on the outside of the nut 23 firstly greatly simplifies the height adjustment of the baffle 19. Workers do not need to use wrenches, pliers, or other tools; they can simply rotate the handle 24 manually to rotate the nut 23 and adjust the height of the baffle 19. This is especially beneficial when the fire extinguisher 7 needs to be frequently changed at different heights during experiments, significantly shortening the height adjustment time and improving experimental efficiency. Secondly, the handle 24 increases the torque during rotation, reducing the effort required for operation.

[0048] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A fire extinguisher pressure fatigue testing apparatus comprising a base, characterised in that: The base has a slide rail in the middle, and mounting seats are provided at both ends of the slide rail. An electric push rod is provided on the upper part of the mounting seat. The free ends of the two electric push rods are connected to push plates. The bottom of the push plate is provided with a slider that is compatible with the slide rail. Several arc-shaped pressure plates that are compatible with fire extinguishers are provided on the outer side of the push plate.

2. The pressure fatigue testing device for fire extinguisher as claimed in claim 1, wherein: An elastic pad is provided on the outer side of the pressure plate.

3. The pressure fatigue testing apparatus for fire extinguisher as claimed in claim 1 wherein: The upper part of the base is provided with a fixing seat, and the interior of the fixing seat is provided with a circular fixing cavity adapted to the fire extinguisher.

4. The pressure fatigue testing apparatus for fire extinguisher as claimed in claim 3 wherein: The fixed base and the mounting base are respectively fixedly connected to the base by bolts.

5. The pressure fatigue testing apparatus for fire extinguisher as claimed in claim 3 wherein: The inner wall of the fixed cavity is provided with several connecting rods, and a sleeve is slidably provided on the outer side of the connecting rods. The free end of the sleeve is provided with a fixing plate adapted to the fire extinguisher, and a spring is provided on the outer side of the sleeve.

6. A pressure fatigue testing apparatus for fire extinguishers as defined in claim 5, characterized in that: The inner side of the sleeve is provided with an anti-detachment groove, and the top of the connecting rod is provided with a stop block that is adapted to the anti-detachment groove.

7. The pressure fatigue testing apparatus for fire extinguisher as claimed in claim 1 wherein: The upper part of the base is provided with several columns, and a baffle is provided through several columns. The baffle has a fixing hole in the middle that is adapted to the top of the fire extinguisher.

8. The fire extinguisher pressure fatigue testing apparatus as described in claim 7, characterized in that: The baffle is provided with several weight-reducing holes.

9. The fire extinguisher pressure fatigue testing apparatus as described in claim 7, characterized in that: The base is provided with a plurality of screws that pass through the baffle, and the upper part of the baffle is provided with nuts that are adapted to the screws.

10. The fire extinguisher pressure fatigue testing apparatus as described in claim 9, characterized in that: The nut has a handle on its outer side.

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