A porous material pore size testing apparatus and method of use thereof

Abstract

The present application belongs to the technical field of material aperture testing, and particularly relates to a porous material aperture testing device and a use method thereof, which comprises a water supply assembly, a pressure supply testing mechanism, a workpiece self-locking mechanism, a circulating assembly and a main base plate, the water supply assembly comprises a water supply disc and a pressure sensor, the water supply disc is arranged on the main base plate, and the pressure sensor is arranged in the water supply disc. According to the flow calculation formula of the fluid in the pipeline, in combination with the relationship between the pipeline specific resistance and the pipe diameter, it can be concluded that in the relationship curve of the pressure difference and the square of the flow velocity, the inclination degree is mainly affected by the pipe diameter, and on this basis, the pipe diameter and the total cross-sectional area jointly affect the height of the curve. According to this phenomenon, in combination with the continuous measurement feature of the present application, a continuous pressure velocity relationship curve can be obtained, so that the small and dense holes and the large and sparse holes can be distinguished.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of material aperture testing, and particularly relates to a porous material aperture testing device and a use method thereof. BACKGROUND

[0002] Porous materials are widely applied in the fields of filtration, catalysis and biomedicine, and the aperture distribution thereof is a key performance index; the aperture testing of the porous materials is microscopic, and the traditional mercury injection method and bubble point method have problems such as complex equipment steps, long testing period and possible sample damage; the present scheme judges the aperture and density of the porous materials through the relationship between the pressure and flow rate of the liquid passing through the porous materials, and has the advantages of simplicity and rapidness.

[0003] The basic principle of the present scheme is similar to the above two methods, that is, the fluid is made to pass through the micropores through pressure application, but there is a problem in such testing: small and dense pores and large and sparse pores may have the same speed of passing through the sample under the same pressure, and therefore how to distinguish the two cases is a key step for perfecting the present scheme. SUMMARY

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present application provides a porous material aperture testing device and a use method thereof; according to the flow calculation formula of the fluid in the pipeline, in combination with the relationship between the pipeline specific resistance and the pipe diameter, it can be concluded that in the pressure difference and flow rate square relationship curve, the inclination degree is mainly affected by the pipe diameter, and on this basis, the pipe diameter and the total cross-sectional area jointly affect the height of the curve; according to this phenomenon, in combination with the continuous measurement feature of the present scheme, a continuous pressure difference and flow rate square curve can be obtained, so as to distinguish the two cases of small and dense pores and large and sparse pores.

[0005] The technical scheme adopted by the present application is as follows: the present application provides a porous material aperture testing device, which comprises a water supply assembly, a pressure supply testing mechanism, a workpiece self-locking mechanism, a circulating assembly and a main base plate, the water supply assembly comprises a water supply disc and a pressure sensor, the water supply disc is arranged on the main base plate, and the pressure sensor is arranged in the water supply disc;

[0006] The pressure supply testing mechanism comprises a test box body and a flow rate sensing assembly, the test box body is arranged on the main base plate, the flow rate sensing assembly comprises a box cover, a drain pipe and a flow rate sensor, the box cover is arranged on the test box body, the drain pipe is arranged on the box cover, and the flow rate sensor is arranged in the drain pipe;

[0007] According to the flow calculation formula of the fluid in the pipeline, in combination with the relationship between the pipe resistance and the pipe diameter, it can be concluded that in the differential pressure and flow rate square relationship curve, the inclination degree is mainly affected by the pipe diameter, and on this basis, the pipe diameter and the total flow area jointly affect the height of the curve; According to this feature, the small and dense holes and the large and sparse holes can be distinguished through continuous measurement.

[0008] The water supply disc is provided with a water distribution pipe connected with the bottom of the test box body.

[0009] The workpiece self-locking mechanism is arranged in the test box body.

[0010] Through the pressure sensor and the flow rate sensor, the pressure difference between the two ends of the measured workpiece and the speed of the liquid flowing through the measured workpiece can be collected, and the relative relationship can be obtained, and according to the height and inclination of the curve, the aperture of the measured workpiece can be detected, so as to judge the deviation between the measured workpiece and the standard sample, which is beneficial to the judgment of the qualification of the product.

[0011] Further, the workpiece self-locking mechanism comprises a pressing plate locking assembly and an automatic telescopic assembly, the pressing plate locking assembly is arranged in the test box body, and the automatic telescopic assembly is slidingly arranged in the pressing plate locking assembly.

[0012] As preferred, the pressing plate locking assembly comprises a workpiece mounting rack, a sliding lock pin and a supporting pressure disc, the workpiece mounting rack is fixedly connected to the inner wall of the test box body, the horizontal sliding groove is uniformly arranged on the workpiece mounting rack, the sliding lock pin is slidingly arranged in the horizontal sliding groove, and the supporting pressure disc is arranged in the workpiece mounting rack and located above the measured workpiece.

[0013] Through the extension of the sliding lock pin, the measured workpiece and the supporting pressure disc can be locked and limited, so as to avoid the position deviation of the measured workpiece and the supporting pressure disc upwardly caused by the impact of the liquid.

[0014] The supporting pressure disc can support the measured workpiece, avoid the problem that the sliding lock pin cannot lock the measured workpiece of flexible material, and the supporting pressure disc will interfere with the flow of the liquid, but the interference caused by the supporting pressure disc to all samples is the same, so the interference can be eliminated through software compensation.

[0015] As further preferred of the present application, the automatic telescopic assembly comprises a hollow floating ring, a ridge-shaped chain and a return spring, the bottom of the workpiece mounting rack is further provided with a ring-shaped sliding groove, the hollow floating ring is slidingly arranged in the ring-shaped sliding groove, and the two ends of the ridge-shaped chain are connected with the sliding lock pin and the hollow floating ring respectively, and the ridge-shaped chain can transmit the pulling force and the pushing force while deforming.

[0016] The lifting driving of the hollow floating ring and the push-pull transmission of the ridge-shaped chain can automatically lock the measured workpiece and the supporting pressure disc when the liquid level in the test box reaches a certain value, and can automatically unlock the measured workpiece and the supporting pressure disc when the liquid level in the test box is lower than the value, thereby simplifying the operation steps and accelerating the loading and unloading speed of the measured workpiece.

[0017] As a further preferred embodiment of the present application, the reset spring is arranged between the hollow floating ring and the workpiece mounting rack.

[0018] Further, the pressure supply testing mechanism further comprises an exhaust assembly, the exhaust assembly comprising an exhaust valve body and a floating valve core, the exhaust valve body being arranged on the box cover, a T-shaped limiting rod being arranged on the floating valve core and located in the exhaust valve body, and the floating valve core being capable of plugging the exhaust valve body when being lifted.

[0019] As a preferred embodiment, a water inlet is further arranged on the box cover, the exhaust assembly further comprising a soft plug, the soft plug being detachably arranged in the water inlet, and a handle being further arranged on the box cover.

[0020] By opening and closing the floating valve core, the air in the test box can be automatically exhausted during the rising of the liquid level, and the floating valve core can be automatically closed after the test box is filled with liquid, thereby avoiding the overflow of the liquid from the exhaust valve body.

[0021] As a preferred embodiment, the circulating assembly comprises a water tank and a water pump, the water tank being provided with a filtering device, the water pump being arranged below the water supply disc, the main bottom plate and the water tank being connected through the water pump and a hose, and the drain pipe and the filtering device being connected through a hose, the water in the filtering device being returned to the water tank after being filtered.

[0022] The present application further provides a use method of the porous material pore size testing device, specifically comprising the following steps:

[0023] Step one: first open the box cover, put the measured workpiece and the supporting pressure disc into the test box in sequence, so that they enter the workpiece mounting rack, and then close the box cover;

[0024] Step two: start the water pump to pump the liquid in the water tank into the water supply disc, and then into the test box through the water distribution pipe, so that the liquid level in the test box rises, and the test box needs to be filled with liquid before measurement, and this step can also be manually added after the soft plug is removed;

[0025] Step three: during the rising of the liquid level in the test box, the air in the test box is exhausted through the gap between the exhaust valve body and the floating valve core, and when the test box is filled with liquid, the floating valve core plugs the exhaust valve body by rising, so that the liquid in the test box does not leak from the exhaust valve body after being filled with liquid;

[0026] Step four: as the liquid level rises, the buoyancy of the hollow float will continue to increase until it is sufficient to overcome the elastic force of the reset spring and rise, the hollow float can push the sliding lock pin to slide transversely and extend when rising, the sliding lock pin can lock and limit the support pressure plate, the ridge-shaped chain is composed of a plurality of blocks that are hingedly connected in sequence, and the rotation angle of adjacent blocks is limited;

[0027] Step five: after the preparation work is completed, the water pump can be started for testing, the water pressure under the measured workpiece can be sensed by the pressure sensor in the water supply disc during the testing process, the water in the testing box body can overflow through the drain pipe, and the flow rate can be sensed through the flow rate sensor;

[0028] Step six: the monitoring result of the pressure sensor can form a closed-loop regulation for the water pump, so that the water supply pressure in the water supply disc presents a stable and slow rising trend, according to the indications of the pressure sensor and the flow rate sensor, the relationship between the square of the flow rate and the water supply pressure can be obtained; when the liquid flows from the hole in the middle of the measured workpiece, the square of the flow rate is proportional to the pressure difference between the two ends, and since the overflow end is communicated with the atmosphere, the indication change trend of the pressure sensor is the change trend of the pressure difference between the two ends, and the relationship between the square of the flow rate and the water supply pressure is a straight line as a whole; the hole diameter affects the inclination degree of the straight line, and on this basis, the total cross-sectional area affects the height of the straight line;

[0029] Step seven: compare the measured curve with the curve of the standard sample to judge the deviation amplitude of the measured workpiece, and then judge the qualification of the measured workpiece;

[0030] Step eight: the liquid overflowing from the drain pipe enters the filtering device and returns to the water tank after being filtered by the filtering device.

[0031] The beneficial effects obtained by the above structure are as follows:

[0032] (1) according to the flow calculation formula of the fluid in the pipeline, combined with the relationship between the pipe resistance and the pipe diameter, it can be obtained that in the relationship curve between the pressure difference and the square of the flow rate, the inclination degree is mainly affected by the pipe diameter, and on this basis, the pipe diameter and the total cross-sectional area jointly affect the height of the curve; according to this feature, the small and dense hole and the large and sparse hole can be distinguished by continuous measurement.

[0033] (2) through the pressure sensor and the flow rate sensor, the pressure difference between the two ends of the measured workpiece and the speed of the liquid flowing through the measured workpiece can be collected, and the relative relationship can be obtained, according to the height and inclination degree of the curve, the hole diameter of the measured workpiece can be detected, so as to judge the deviation amplitude between the measured workpiece and the standard sample, which is beneficial to judge the qualification of the product.

[0034] (3) Through the extension of the sliding lock pin, the measured workpiece and the supporting pressure plate can be locked and limited, so that the position deviation of the measured workpiece and the supporting pressure plate upwardly is avoided when the liquid impact occurs.

[0035] (4) Through the lifting opening and closing of the floating valve core, the air in the test box can be automatically discharged during the process of the liquid level rising, and the floating valve core is automatically closed after the liquid fills the test box, so that the overflow of the liquid from the exhaust valve body is avoided.

[0036] (5) The supporting pressure plate can support the measured workpiece, so that the problem that the sliding lock pin cannot be locked when the flexible material measured workpiece is tested is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a perspective view of a porous material pore size testing device provided by the present application;

[0038] Figure 2 It is a front view of a porous material pore size testing device provided by the present application;

[0039] Figure 3 It is a left view of a porous material pore size testing device provided by the present application;

[0040] Figure 4 It is a top view of a porous material pore size testing device provided by the present application;

[0041] Figure 5 It is a sectional view along the cutting line A-A in the Figure 3

[0042] Figure 6 It is a half-sectional structural schematic view of a porous material pore size testing device provided by the present application;

[0043] Figure 7 It is a partial enlarged view of I in the Figure 5

[0044] Figure 8 It is a partial enlarged view of II in the Figure 5

[0045] Figure 9 It is a partial enlarged view of III in the Figure 6

[0046] Figure 10 It is a schematic view of the relationship between the pressure sensor display and the square of the flow rate sensor display.

[0047] ​​​​Wherein, 1, water supply assembly, 2, pressure supply testing mechanism, 3, workpiece self-locking mechanism, 4, circulating assembly, 5, main base plate, 6, water supply tray, 7, pressure sensor, 8, water distribution pipe, 9, test box, 10, flow rate sensing assembly, 11, exhaust assembly, 12, support leg, 13, box cover, 14, drain pipe, 15, flow rate sensor, 16, exhaust valve body, 17, floating valve core, 18, soft plug, 19, handle, 20, water inlet, 21, T-shaped limiting rod, 22, pressing plate locking assembly, 23, automatic telescopic assembly, 24, workpiece mounting rack, 25, sliding locking pin, 26, supporting pressing disc, 27, hollow floating ring, 28, ridge-shaped chain, 29, return spring, 30, annular sliding groove, 31, transverse sliding groove, 32, water tank, 33, water pump, 34, filtering device, 35, measured workpiece.

[0048] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0050] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] As Figures 1-9 shown, the present application provides a porous material pore size testing device, which comprises a water supply assembly 1, a pressure supply testing mechanism 2, a workpiece self-locking mechanism 3, a circulating assembly 4 and a main base plate 5, the water supply assembly 1 comprises a water supply tray 6 and a pressure sensor 7, the water supply tray 6 is arranged on the main base plate 5, and the pressure sensor 7 is arranged in the water supply tray 6;

[0052] The pressure supply testing mechanism 2 comprises a testing box 9 and a flow rate sensing assembly 10, the testing box 9 is provided with a supporting leg 12, the testing box 9 is arranged on the main base plate 5 through the supporting leg 12, the flow rate sensing assembly 10 comprises a box cover 13, a drain pipe 14 and a flow rate sensor 15, the box cover 13 is arranged on the testing box 9, the drain pipe 14 is arranged on the box cover 13, and the flow rate sensor 15 is arranged in the drain pipe 14;

[0053] According to the flow calculation formula of the fluid in the pipeline, in combination with the relationship between the pipe resistance and the pipe diameter, it can be concluded that in the differential pressure and flow rate square relationship curve, the inclination degree is mainly affected by the pipe diameter, and on this basis, the pipe diameter and the total flow area jointly affect the height of the curve; according to this feature, the small and dense holes and the large and sparse holes can be distinguished through continuous measurement.

[0054] The water supply disc 6 is provided with a water distribution pipe 8 connected with the bottom of the testing box 9.

[0055] The workpiece self-locking mechanism 3 is arranged in the testing box 9.

[0056] Through the pressure sensor 7 and the flow rate sensor 15, the pressure difference between the two ends of the measured workpiece 35 and the speed of the liquid flowing through the measured workpiece 35 can be collected, and the relative relationship can be obtained, according to the height and inclination degree of the curve, the aperture of the measured workpiece 35 can be detected, so as to judge the deviation amplitude between the measured workpiece 35 and the standard sample, which is beneficial to the judgment of the qualification of the product.

[0057] The workpiece self-locking mechanism 3 comprises a pressing plate locking assembly 22 and an automatic telescopic assembly 23, the pressing plate locking assembly 22 is arranged in the testing box 9, and the automatic telescopic assembly 23 is slidingly arranged in the pressing plate locking assembly 22.

[0058] The pressing plate locking assembly 22 comprises a workpiece mounting rack 24, a sliding locking pin 25 and a supporting pressure disc 26, the workpiece mounting rack 24 is fixedly connected to the inner wall of the testing box 9, a plurality of transverse sliding grooves 31 are uniformly arranged in the annular workpiece mounting rack 24, the sliding locking pin 25 is slidingly arranged in the transverse sliding groove 31, and the supporting pressure disc 26 is clamped in the workpiece mounting rack 24 and located above the measured workpiece 35.

[0059] Through the extension of the sliding locking pin 25, the measured workpiece 35 and the supporting pressure disc 26 can be locked and limited, so as to avoid the position deviation of the measured workpiece 35 and the supporting pressure disc 26 upwardly when the liquid impacts.

[0060] The supporting pressure disc 26 can support the measured workpiece 35, so as to avoid the problem that the sliding locking pin 25 cannot lock the measured workpiece 35 made of flexible material.

[0061] The automatic telescopic assembly 23 comprises a hollow float 27, a ridge chain 28 and a reset spring 29, the bottom of the workpiece mounting rack 24 is further provided with an annular sliding groove 30, the hollow float 27 is clamped and slidably arranged in the annular sliding groove 30, the two ends of the ridge chain 28 are connected with the sliding locking pin 25 and the hollow float 27 respectively, and the ridge chain 28 can transmit the pulling force and the pushing force while deforming.

[0062] Through the lifting driving of the hollow float 27 and the pushing and pulling driving of the ridge chain 28, the locking of the measured workpiece 35 and the support pressing disc 26 can be automatically completed when the liquid level in the test box 9 reaches a certain value, and the measured workpiece 35 and the support pressing disc 26 can be automatically unlocked when the liquid level in the test box 9 is lower than the value, so that the operation steps are simplified, and the loading and unloading speed of the measured workpiece 35 is accelerated.

[0063] The reset spring 29 is arranged between the hollow float 27 and the workpiece mounting rack 24.

[0064] The pressure supply testing mechanism 2 further comprises an exhaust assembly 11, the exhaust assembly 11 comprises an exhaust valve body 16 and a floating valve core 17, the exhaust valve body 16 is arranged on the box cover 13, the floating valve core 17 is provided with a T-shaped limiting rod 21, the T-shaped limiting rod 21 is located in the exhaust valve body 16, and the floating valve core 17 can block the exhaust valve body 16 when the floating valve core 17 rises.

[0065] The box cover 13 is further provided with a water inlet 20, the exhaust assembly 11 further comprises a soft plug 18, the soft plug 18 is detachably arranged in the water inlet 20, and the box cover 13 is further provided with a handle 19.

[0066] Through the opening and closing of the floating valve core 17, the air in the test box 9 can be automatically exhausted in the process of the liquid level rising, and the floating valve core 17 can be automatically closed after the liquid fills the test box 9, so that the overflow of the liquid from the exhaust valve body 16 can be avoided.

[0067] The circulating assembly 4 comprises a water tank 32 and a water pump 33, the water tank 32 is provided with a filtering device 34, the water pump 33 is arranged below the water supply disc 6, the main bottom plate 5 and the water tank 32 are connected through the water pump 33 and a hose, the drain pipe 14 and the filtering device 34 are connected through the hose, and the water in the filtering device 34 is returned to the water tank 32 after being filtered.

[0068] As shown in the figure, Figure 10 the horizontal axis represents the indication P of the pressure sensor 7, since the drain pipe 14 is connected with the external atmosphere, the change trend of the indication of the pressure sensor 7 is the change trend of the pressure difference between the two ends of the test box 9, and the vertical axis represents the square of the indication of the flow rate sensor 15, which can reflect the flow rate or flow volume of the liquid flowing through the measured workpiece 35;

[0069] The area between a and b represents the measurement range of the statistical index, and the workpiece self-locking mechanism 3 has completed automatic locking before a;

[0070] D, B, and C are curve examples of three samples. Considering factors such as accuracy and error, the actual curve may fluctuate, but the overall trend is linear as shown in the figure;

[0071] According to the formula for calculating the flow in the pipeline:

[0072] ; ;

[0073] Where Q is the flow, A is the cross-sectional area, v is the flow rate, P is the pressure difference between the two ends, p is the fluid density, g is the acceleration of gravity, S is the pipe resistance, L is the pipe length, n is the pipe roughness coefficient (related to material), and d is the pipe diameter.

[0074] According to the above formula, P is proportional to v², and d affects the proportional coefficient of the two (the smaller d is, the smaller the proportional coefficient of the two, and the smaller the slope of the curve), and the remaining parameters are constant values.

[0075] D represents the measurement result curve of the standard sample, and B and D have intersection points, that is, when the test pressure is c, the flow rates of the two are equal, but according to the analysis of the slope of the curve, it can be known that the aperture of the B sample is smaller than that of the D sample, and the total cross-sectional area of the B sample is larger than that of the D sample. The total cross-sectional area represents the sum of all aperture diameters of the sample.

[0076] The slopes of C curve and B curve are equal, indicating that the apertures of the two are close, but the density of the holes is different, resulting in different total cross-sectional areas, so the heights of the two curves are different.

[0077] In specific use, first open the box cover 13, and then put the measured workpiece 35 and the supporting pressure plate 26 into the test box body 9 in sequence, so that they enter the workpiece mounting frame 24, and then close the box cover 13.

[0078] Start the water pump 33 to pump the liquid in the water tank 32 into the water supply plate 6, and then into the test box body 9 through the water distribution pipe 8, so that the liquid level in the test box body 9 rises. Before measurement, the test box body 9 needs to be filled with liquid, and this step can also be manually added after the soft plug 18 is removed.

[0079] During the process of rising of the liquid level in the test box body 9, the air in the test box body 9 will be discharged through the gap between the exhaust valve body 16 and the floating valve core 17. When the test box body 9 is filled with liquid, the floating valve core 17 will block the exhaust valve body 16 by rising itself, so the test box body 9 will not leak from the exhaust valve body 16 after being filled with liquid.

[0080] With the increase of the liquid level, the hollow float 27 will continue to increase the buoyancy, until enough to overcome the elastic force of the reset spring 29 and rise, hollow float 27 rises when the ridge chain 28 can push the slide lock pin 25 lateral sliding extension, ridge chain 28 by a number of blocks in turn hinged, wherein the adjacent block rotation angle is limited.

[0081] After the preparation is completed, the water pump 33 can be started for testing. During the test, the pressure sensor 7 in the water supply disc 6 can sense the water pressure below the measured workpiece 35. The water in the test box 9 can overflow through the drain pipe 14 and be sensed by the flow rate sensor 15. At the same time, the flow rate can also be obtained.

[0082] The monitoring result of the pressure sensor 7 can form a closed loop regulation for the water pump 33, so that the water supply pressure in the water supply disc 6 presents a stable and slow rising trend. According to the readings of the pressure sensor 7 and the flow rate sensor 15, the relationship between the square of the flow rate and the water supply pressure can be obtained. When the liquid flows from the hole in the middle of the measured workpiece 35, the square of the flow rate is proportional to the pressure difference between the two ends. Since the overflow end is connected with the atmosphere, the change trend of the reading of the pressure sensor 7 is the change trend of the pressure difference between the two ends. The relationship between the square of the flow rate and the water supply pressure is a straight line as a whole. The hole diameter affects the inclination of the straight line, and the total cross-sectional area affects the height of the straight line.

[0083] By comparing the measured curve with the standard sample curve, the deviation amplitude of the measured workpiece 35 can be judged, and the qualification of the measured workpiece 35 can be judged.

[0084] The liquid overflowing from the drain pipe 14 enters the filter device 34 and flows back to the water tank 32 after being filtered by the filter device 34.

[0085] Example one: when the research and development test is carried out, the hole diameter and hole density of the material can be reflected according to the test result curve.

[0086] Example two: when the production quality inspection test is carried out, the deviation of the hole diameter and hole density of the material from the standard value can be reflected according to the deviation amplitude of the test result curve from the standard sample curve, so as to provide a basis for judging the qualification of the product.

[0087] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; thus the use of any

[0088] The above description of the application and its embodiments is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the application.

Claims

1. A porous material pore size testing apparatus, characterized by: Including water supply assembly (1), supply pressure test mechanism (2), workpiece self-locking mechanism (3), circulating assembly (4) and main base plate (5), the water supply assembly (1) includes water supply tray (6) and pressure sensor (7), the water supply tray (6) is located on the main base plate (5), the pressure sensor (7) is located in the water supply tray (6); The supply pressure test mechanism (2) includes test box body (9) and flow rate sensing assembly (10), the test box body (9) is located on the main base plate (5), the flow rate sensing assembly (10) includes tank cover (13), drain pipe (14) and flow rate sensor (15), the tank cover (13) is located on the test box body (9), the drain pipe (14) is located on the tank cover (13), the flow rate sensor (15) is located in the drain pipe (14); The water supply tray (6) is provided with a water distribution pipe (8) connected with the bottom of the test box body (9); The workpiece self-locking mechanism (3) is located in the test box body (9); The monitoring result of the pressure sensor (7) can form closed-loop regulation for the water pump (33), so that the water supply pressure in the water supply tray (6) presents a stable and slow rising trend.

2. A porous material pore size testing apparatus according to claim 1, wherein: The workpiece self-locking mechanism (3) includes pressure plate locking assembly (22) and automatic telescopic assembly (23), the pressure plate locking assembly (22) is located in the test box body (9), and the automatic telescopic assembly (23) is slidingly arranged in the pressure plate locking assembly (22).

3. A porous material pore size testing apparatus according to claim 2, wherein: The pressure plate locking assembly (22) includes workpiece mounting bracket (24), sliding lock pin (25) and support pressure disc (26), the workpiece mounting bracket (24) is fixedly connected to the inner wall of the test box body (9), the workpiece mounting bracket (24) is uniformly arranged with horizontal sliding groove (31) on the annular, the sliding lock pin (25) is slidingly arranged in the horizontal sliding groove (31), the support pressure disc (26) is clamped in the workpiece mounting bracket (24), and the support pressure disc (26) is located above the measured workpiece (35).

4. A porous material pore size testing apparatus according to claim 3, wherein: The automatic telescopic assembly (23) includes hollow floating ring (27), ridge chain (28) and reset spring (29), the bottom of the workpiece mounting bracket (24) is further provided with annular sliding groove (30), the hollow floating ring (27) is slidingly arranged in the annular sliding groove (30), the two ends of the ridge chain (28) are connected with the sliding lock pin (25) and the hollow floating ring (27) respectively, and the ridge chain (28) can transmit tension and thrust while deforming.

5. A porous material pore size testing apparatus according to claim 4, wherein: The reset spring (29) is arranged between the hollow floating ring (27) and the workpiece mounting bracket (24).

6. A porous material pore size testing apparatus according to claim 5, wherein: The supply pressure test mechanism (2) further includes exhaust assembly (11), the exhaust assembly (11) includes exhaust valve body (16) and floating valve core (17), the exhaust valve body (16) is arranged on the tank cover (13), the floating valve core (17) is provided with T-shaped limiting rod (21), the T-shaped limiting rod (21) is located in the exhaust valve body (16), and the floating valve core (17) can block the exhaust valve body (16) when rising.

7. A porous material pore size testing apparatus according to claim 6, wherein: The box cover (13) is further provided with a water adding opening (20), and the exhaust assembly (11) further comprises a soft plug (18) which is detachably arranged in the water adding opening (20), and the box cover (13) is further provided with a handle (19).

8. A porous material pore size testing apparatus according to claim 7, wherein: The circulating assembly (4) comprises a water tank (32) and a water pump (33), the water tank (32) is provided with a filtering device (34), the water pump (33) is arranged below the water supply disc (6), the main bottom plate (5) and the water tank (32) are connected through the water pump (33) and a hose, the drain pipe (14) and the filtering device (34) are connected through a hose, and the water in the filtering device (34) is returned to the water tank (32) after being filtered.

9. A method of using a porous material pore size testing device according to claim 8, characterized in that, The method comprises the following steps: Step one: first open the box cover (13), put the measured workpiece (35) and the supporting pressure plate (26) into the test box body (9) in sequence, so that they enter the workpiece mounting frame (24), and then close the box cover (13); Step two: start the water pump (33), pump the liquid in the water tank (32) into the water supply disc (6), and then into the test box body (9) through the water distribution pipe (8), so that the liquid level in the test box body (9) rises, and the test box body (9) needs to be filled with liquid before measurement, or the soft plug (18) is removed and manually added; Step three: in the process of rising of the liquid level in the test box body (9), the air in the test box body (9) is discharged through the gap between the exhaust valve body (16) and the floating valve core (17), when the test box body (9) is filled with liquid, the floating valve core (17) will block the exhaust valve body (16) by rising, so the test box body (9) will not leak from the exhaust valve body (16) after being filled with liquid; Step four: as the liquid level rises, the buoyancy of the hollow floating ring (27) will also continue to increase until it is sufficient to overcome the elastic force of the return spring (29) and rise, when the hollow floating ring (27) rises, it can push the sliding lock pin (25) to slide transversely and extend through the ridge-shaped chain (28), so as to lock and limit the supporting pressure plate (26), the ridge-shaped chain (28) is composed of a plurality of blocks which are hingedly connected in sequence, and the rotation angle of adjacent blocks is limited; Step five: after the preparation work is completed, continue to start the water pump (33) for testing, during the testing, the water pressure below the measured workpiece (35) can be sensed through the pressure sensor (7) in the water supply disc (6), the water in the test box body (9) will overflow through the drain pipe (14) and the flow rate sensor (15) senses the flow rate, and the flow rate can also be known; Step six: according to the indication of the pressure sensor (7) and the flow rate sensor (15), the relationship between the square of the flow rate and the water supply pressure can be obtained; when the liquid flows through the hole in the middle of the measured workpiece (35), the square of the flow rate is proportional to the pressure difference between the two ends, and since the overflow end is communicated with the atmosphere, the change trend of the indication of the pressure sensor (7) is the change trend of the pressure difference between the two ends, and the relationship between the square of the flow rate and the water supply pressure is a straight line as a whole; The hole diameter affects the inclination degree of the straight line, and the total cross-sectional area affects the height of the straight line. Step seven: compare the measured curve with the curve of the standard sample to determine the deviation range of the measured workpiece (35) and further determine its qualification; Step eight: the liquid overflowing from the drain pipe (14) enters the filter device (34) and is returned to the water tank (32) after being filtered by the filter device (34).

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