A mortar permeability meter

Abstract

The utility model discloses a mortar impermeability appearance relates to building material performance test technical field, including including box, be equipped with pressure supply system in the box, a plurality of moulds are detachably connected through screw threads to the box top wall, the pressure supply system includes water pump, a plurality of installation components are equipped with in the box, the installation component all includes push rod, and first rack is fixedly connected on the arbitrary one side wall of push rod, the inside wall hinged of box has the lever, the hinged place of lever and box is equipped with first torsional spring, the upper portion of lever is equipped with the turntable, the second rack is rotatably connected in the turntable, and second rack is arc, and second rack and adjacent mould coaxial arrangement, the first pawl is engaged on the second rack, and first pawl is hinged with the box top wall, the hinged place of first pawl and box is equipped with the second torsional spring, to promote the efficiency of mortar impermeability test.

Description

Technical Field

[0001] This utility model relates to the field of building material performance testing technology, and in particular to a mortar impermeability tester. Background Technology

[0002] Mortar, a widely used material in construction engineering, directly affects the durability and safety of structures due to its impermeability. Impermeability refers to the mortar's ability to resist the penetration of pressurized water. Especially in hydraulic engineering, underground structures, or humid environments, insufficient impermeability can lead to water seepage, causing problems such as steel reinforcement corrosion, freeze-thaw cycle damage, or chemical corrosion, thus accelerating structural deterioration. Therefore, mortar impermeability testing is a crucial step in evaluating its waterproofing performance and quality control. By simulating actual water pressure environments, the test can determine the impermeability of specimens under specific pressures, and use impermeability grades (such as P4, P6) as quantitative indicators to provide a scientific basis for material selection and construction acceptance.

[0003] The existing mortar permeability tester is a comprehensive device integrating pressure control, sealing, and observation analysis. Its core structure includes a pressure system, a specimen mold, a sealing device, a control system, and an observation system. The pressure system generates and maintains a water pressure of 0.1~1.5MPa through a water pump and pressure vessel, with a pressure gauge monitoring the changes in pressure in real time. The specimen mold adopts a standard frustum-shaped metal structure with a smaller inner diameter at the top and a larger inner diameter at the bottom (175mm at the top, 185mm at the bottom), and a height of 150mm, used to fix the specimen. The sealing device typically consists of rubber gaskets or flexible sealant to prevent water leakage from the gap between the specimen and the mold. The control system can set the pressure increase rate (e.g., 0.1MPa per hour) and the pressure holding time. The observation system determines the permeability performance by observing water seepage on the back of the specimen or the height of the seepage.

[0004] The core of the experiment lies in the standardized installation of the specimens. First, mortar specimens conforming to standards must be prepared, cured for 28 days, and then wiped dry and allowed to air dry completely. Before installation, the inner wall of the mold and any residue at the bolt threads must be thoroughly cleaned, and the rubber sealing rings must be checked for integrity. A mixture of molten grease and cement or a special sealant should be evenly applied to the sides of the specimen, with a thickness controlled at 1-2 mm, ensuring the sealing material is flexible and does not clog the permeable pores. Then, the specimen is placed in the mold, ensuring its bottom surface fits tightly against the permeable plate. Finally, the mold is installed onto the permeability meter using its built-in threads.

[0005] In the above process, operators often need to remove the mold and use manual pressure devices to press the specimen into the mold to install it. Then, the mold with the mold installed is placed in the appropriate position on the permeability analyzer. However, since permeability tests often require six to eight specimens to be tested simultaneously, installing the specimens and molds sequentially would undoubtedly result in a waste of test specimens. Utility Model Content

[0006] The purpose of this invention is to provide a mortar impermeability tester to solve the above-mentioned problems.

[0007] This utility model is achieved through the following technical solution:

[0008] A mortar permeability tester includes a housing with a pressure supply system inside. Several molds are detachably connected to the top wall of the housing via threads. The pressure supply system includes a water pump, and all molds are connected to the water pump. Several mounting components are provided inside the housing, each including a push rod that slides within the housing. A first rack is fixedly connected to any side wall of the push rod. A lever is hinged to the inner wall of the housing, and a first torsion spring is provided at the hinge point between the lever and the housing. A turntable is located above the lever, and the turntable has an elongated hole. The lever slides through the elongated hole and engages with the turntable. The bottom wall of the turntable is rotatably connected to the top wall of the housing. A second rack, which is arc-shaped, is rotatably connected inside the turntable and coaxially arranged with adjacent molds. A first pawl engages with the second rack, and the first pawl is hinged to the top wall of the housing. A second torsion spring is sleeved at the hinge point between the first pawl and the housing.

[0009] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0010] This embodiment, through the design of the installation components, uses levers, a second rack, and a first pawl to convert the downward force of the specimen and mold into torque, which is then transmitted back to the mold, thereby helping to tighten the mold and reducing the workload of the operator during the specimen installation process.

[0011] Compared with existing technologies, this solution requires no additional power input, effectively reducing the energy consumption of the device. At the same time, since the specimens and molds can be installed synchronously in this solution, the overall duration of the anti-permeability test can be reduced, improving the operating efficiency of the operators and simplifying the operation steps of the anti-permeability test.

[0012] Furthermore, a second pawl is also engaged on the second rack. The second pawl is hinged to the outer top wall of the housing, and a third torsion spring is sleeved at the hinge point between the second pawl and the housing. The first pawl and the second pawl are arranged symmetrically, and a cam is provided between the first pawl and the second pawl. The cam is rotatably connected to the outer wall of the housing.

[0013] Beneficial effects: The design of the second pawl and cam in this solution makes it applicable to molds with threads having different tightening directions, effectively expanding the scope of application and facilitating its subsequent promotion and application.

[0014] Furthermore, the installation assembly also includes a pressure accumulator assembly, which includes a spring. The top and bottom ends of the spring are fixedly connected to baffles, and the sidewalls of the baffles are slidably engaged with the inner sidewall of the housing. The baffle located below the spring is fixedly connected to the push rod. The inner sidewall of the housing has several grooves, and the grooves are all arranged below the spring. The sidewalls of the grooves are all hinged to partitions, and a fourth torsion spring is sleeved at the hinge joint between the partitions and the sidewalls of the grooves.

[0015] Beneficial effects: The design of the pressure accumulator component in this solution utilizes a spring to store energy, thereby transferring a larger kinetic energy to the push rod during the spring reset process. This increases the torque applied to the specimen by the second rack, helping the mold to tighten further. Compared with existing technologies, this solution can adapt to situations where the required torque for tightening increases due to the increase in preload during mold tightening.

[0016] Furthermore, the top wall of the enclosure is detachably connected to a frame, and several electric bars are installed on the frame.

[0017] Beneficial effects: Compared with existing technologies, this solution further reduces the number of steps required for operators through the design of the electric bar. At the same time, by detachably connecting the frame and the housing, it effectively avoids the electric bar and frame from hindering the operation of the operator, thus improving the ease of use of the device.

[0018] Furthermore, a pressure plate is rotatably connected to the output end of the electric lever.

[0019] Beneficial effects: The design of the pressure plate in this scheme ensures that the pressure applied to the mold by the electric rod is evenly distributed during the pressurization process, avoiding damage to the mold or specimen surface during the pressurization process, which would affect the service life of the device and the accuracy and validity of the test data.

[0020] Furthermore, the pressure plate is arranged coaxially with the output end of the electric lever.

[0021] Beneficial effects: Compared with the existing technology, this solution arranges the pressure plate and the electric rod coaxially, so that the electric rod can apply force along the axial direction of the pressure plate. Compared with the eccentric arrangement, it can avoid the pressure plate tilting during the force application process, which would cause damage to the pressure plate.

[0022] Furthermore, the outer wall of the mold is provided with several sharp edges.

[0023] Beneficial effects: The design of the angular shape in this solution increases the number of contact points between the mold and the second rack compared to the design of the arc-shaped mold surface, thereby reducing the energy loss during the process of the second rack transmitting torque to the mold.

[0024] Furthermore, the pressure supply system also includes a water storage tank, several regulating valves, and several pressure gauges. The water pump is connected to the output end of the water storage tank, all the regulating valves are connected to the water pump, all the pressure gauges are connected to the adjacent regulating valves, and all the pressure gauges are connected to the adjacent molds.

[0025] Beneficial effects: Compared with existing technologies, this solution effectively expands its applicability through the design of the water storage tank, regulating valve, and pressure gauge, making it easier for operators to adjust and monitor the pressure during the anti-seepage test in real time.

[0026] Furthermore, a channel is provided in the baffle located above the spring. The output end of the channel is connected to the mold, and the input end of the channel is connected to the adjacent pressure gauge. A solenoid valve is provided at the connection between the channel and the pressure gauge.

[0027] Beneficial effects: This solution, through the design of the channel, enables pressure to be applied to the specimen from the center of the bottom surface of the mold. Compared with other design solutions, this solution can reduce water concentration between the mold and the specimen, thereby reducing the damage to the waterproofing measures on the side wall of the specimen and affecting the test.

[0028] Furthermore, the lever is L-shaped, and the length of the segment of the lever near the first rack is shorter than the length of the segment near the turntable.

[0029] Beneficial effects: Compared with the existing technology, this solution changes the shape of the lever so that the angular velocity at the contact point between the lever and the turntable is greater than that at the contact point with the first rack, thereby increasing the angle at which the turntable can be rotated by a single swing of the lever. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a top view of the present invention;

[0032] Figure 2 for Figure 1 Sectional view along the AA direction;

[0033] Figure 3 for Figure 1 Cross-sectional view along the BB direction;

[0034] Figure 4 for Figure 1 Cross-sectional view along the CC direction.

[0035] The reference numerals in the attached drawings represent: 1. Housing; 2. Mounting assembly; 21. Turntable; 211. Oblong hole; 22. First pawl; 221. Cam; 222. Second pawl; 23. Second rack; 24. Baffle; 241. Channel; 25. Spring; 26. Partition; 261. Groove; 27. Push rod; 28. First rack; 29. ​​Lever. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are for explaining the utility model only and are not intended to limit the utility model. It should be noted that this utility model is already in the actual research and development stage.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, this embodiment includes a housing 1, which is equipped with a pressure supply system. Several molds are detachably connected to the top wall of the housing 1 via threads.

[0039] The pressure supply system includes a water pump (not shown in the figure), a water storage tank, several regulating valves, and several pressure gauges. The water pump is connected to the output end of the water storage tank, the regulating valves are all connected to the water pump, the pressure gauges are all connected to the adjacent regulating valves, and the pressure gauges are all connected to the adjacent molds.

[0040] The housing 1 contains several mounting components 2, each including a push rod 27. The push rod 27 slides within the housing 1, and a first rack 28 is bolted to either side wall of the push rod 27. A lever 29 is hinged to the inner wall of the housing 1. A first torsion spring is located at the hinge point between the lever 29 and the housing 1. One end of the first torsion spring is welded to the inner wall of the housing 1, and the other end is welded to the lever 29. A turntable 21 is located above the lever 29, and an elongated hole 211 is formed on the turntable 21. The lever 29 slides through the elongated hole 211 with the turntable 21. The bottom wall of the turntable 21 is rotatably connected to the top wall of the housing 1. A second rack 23, which is arc-shaped, is rotatably connected to the top wall of the turntable 21. A first pawl 22 is engaged on the second rack 23, and the first pawl 22 is hinged to the top wall of the turntable 21. A second torsion spring is sleeved at the hinge point between the first pawl 22 and the housing 1. One end of the second torsion spring is welded and fixed to the first pawl 22, and the other end of the second torsion spring is welded and fixed to the top wall of the turntable 21. A second pawl 222 is also engaged on the second rack 23, and the second pawl 222 is hinged to the outer top wall of the turntable 21. A third torsion spring is sleeved at the hinge point between the second pawl 222 and the turntable 21. One end of the third torsion spring is welded and fixed to the turntable 21, and the other end of the third torsion spring is welded and fixed to the second pawl 222. The first pawl 22 and the second pawl 222 are symmetrically arranged, and a cam 221 is provided between the first pawl 22 and the second pawl 222. The cam 221 is rotatably connected to the top wall of the turntable 21.

[0041] The installation assembly 2 also includes a pressure accumulator assembly, which includes a spring 25. A baffle 24 is welded and fixed to the top and bottom of the spring 25, and the side wall of the baffle 24 is slidably engaged with the inner side wall of the housing 1. The baffle 24 located below the spring 25 is welded and fixed to the push rod 27. The inner side wall of the housing 1 has several grooves 261, and the grooves 261 are all arranged below the spring 25. The side walls of the grooves 261 are all hinged to partitions 26, and a fourth torsion spring is sleeved at the hinge point between the partitions 26 and the side walls of the grooves 261. One end of the fourth torsion spring is welded and fixed to the partition 26, and the other end of the fourth torsion spring is welded and fixed to the side wall of the groove 261.

[0042] A channel 241 is opened in the baffle 24 located above the spring 25. The output end of the channel 241 is connected to the mold, and the input end of the channel 241 is connected to the adjacent pressure gauge. A solenoid valve is provided at the connection between the channel 241 and the pressure gauge.

[0043] The specific implementation method is as follows: Before using this device, prepare a suitable mortar specimen. After the specimen has been cured, perform appropriate waterproofing treatment on the side wall of the specimen, such as by installing rubber rings. Place the specimen with the bottom surface facing down in a suitable position on the top wall of the box 1. Then place the mold on top of the specimen. Since the standard specimen used in the mortar impermeability test is in the shape of a frustum, after the mold is placed, it moves downward under the action of gravity, thereby moving to a position almost coaxial with the specimen. The operator adjusts the mold according to the positional relationship between the two and adjusts the angle of the cam according to the thread direction of the mold (for example, the thread of the mold is a right-hand thread under normal conditions. At this time, the operator should rotate the cam to abut against the pawl on the right side, so that the first pawl 22 and the second rack 23 are engaged). Then, use a screw press or other downward force along the mold axis to push the mold downward.

[0044] During this process, as the mold and the specimen gradually move downwards, the specimen pushes the baffle 24 downwards as it enters the mold, simultaneously causing the spring 25 to move downwards. When the spring 25 reaches the position of the partition 26, the partition 26 obstructs the spring 25 from continuing to move downwards. At this time, with the movement of the baffle 24, the spring 25 is gradually compressed. During the movement of the spring 25, the baffle 24 located below the spring 25 continuously pushes the push rod 27 downwards. At this time, the first rack 28 also moves downwards following the movement of the push rod 27. When the contact position between the lever 29 and the first rack 28 moves from the tooth groove to the tooth tip, the teeth cause the lever 29 to rotate. When the contact position between the lever 29 and the first rack 28 moves from the tooth tip to the tooth groove, the pushing action of the teeth on the lever 29 is released. At this time, the first torsion spring resets, causing the lever 29 to reset. With the movement of the first rack 28, the above process repeats, causing the lever 29 to swing back and forth.

[0045] The lever 29 drives the turntable 21 to rotate through the elongated hole 211 (during this process, since the turntable 21 is rotatably connected to the housing 1, the lever 29 drives the turntable 21 to rotate and collide with the elongated hole 211 at different positions). When the direction of rotation of the turntable 21 is opposite to the direction of the test piece thread (that is, rotating the test piece in this direction can separate the test piece from the housing 1), the second rack 23 cannot follow the turntable 21 due to the friction between the second rack 23 and the outer surface of the mold. At this time, the turntable 21 drives the first pawl 22 to rotate, causing the second rack 23 to move against the first pawl 22. When the turntable 21 rotates in the opposite direction under the action of the lever 29, the first pawl 22 restricts the rotation direction of the second rack 23, thus enabling the turntable 21 to drive the test piece to rotate through the first pawl 22 and the second rack 23.

[0046] As the first rack 28 moves, the above steps are repeated, thereby achieving intermittent prying of the specimen, which in turn helps to fix the specimen to the housing 1.

[0047] When the pusher below the spring 25 moves to the position of the baffle 24, the spring 25 is compressed due to the restriction of the partition 26. However, as the electric lever continues to work, the force exerted by the baffle 24 on the partition 26 gradually increases, pushing the partition 26 to rotate at a certain moment. As the partition 26 rotates, the obstruction effect of the partition 26 on the baffle 24 is released, the spring 25 returns to its original position, and the push rod 27 is quickly pushed downward through the partition 26. The first rack 28 drives the lever 29 to swing rapidly, and then the second rack 23 increases the rotation speed of the specimen. The mold transmits high torque in a short time, thereby further helping the mold to tighten.

[0048] Compared to existing technologies, this solution, through the design of the first rack 28, converts the force applied to the mold to propel the specimen into the mold into the reciprocating oscillation power of the lever 29. Subsequently, through the turntable 21 and the second rack 23, torque is provided to the specimen, causing both the specimen and the mold to rotate. This allows for simultaneous installation of the mold and the specimen. Furthermore, compared to solutions using rack and pinion gear transmission, this solution requires less space for each component during operation, minimizing the impact on the overall size of the device. The design of the lever 29 also contributes to this improvement.

[0049] Meanwhile, during the process of tightening the specimen and the housing 1 by screwing them together, the axial preload generated by the mold increases due to factors such as the increase in the contact area between the two and material deformation, and the required torque also increases accordingly. In this scheme, the design of the spring 25 utilizes the partition plate 26 to store energy in the spring 25 and release the spring 25 in an instant, increasing the kinetic energy transmitted to the second rack 23 through the first rack 28, thereby increasing the torque applied to the specimen by the second rack 23, further tightening the mold, and reducing the occurrence of mold detachment affecting the test during the impermeability test.

[0050] After the specimens and molds are installed, start the solenoid valve, water pump and regulating valve according to the test requirements to inject water into the bottom of each specimen, and monitor the water pressure through a pressure gauge.

[0051] After the test is completed, the operator rotates the cam 221 so that the cam 221 does not contact the first pawl 22. Then, the mold is rotated in the opposite direction to remove the mold from the housing 1. At this time, the lever 29 is moved away from the first rack 28, and the fixing effect of the lever 29 on the first rack 28 is released. After the baffle 24 is returned to its position, the lever 29 is released. After the first torsion spring is reset, the return of this scheme is completed.

[0052] Example 2

[0053] The difference from the above embodiment is that: the top wall of the box 1 is detachably connected to a frame (not shown in the figure) by bolts, and several electric rods are fixedly connected to the frame by bolts. The output end of the electric rod is rotatably connected to a pressure plate, and the pressure plate is arranged coaxially with the output end of the electric rod.

[0054] The specific implementation method is as follows: When using this solution, after the mold is placed above the specimen, the frame is installed on the box 1, and then the electric lever is started. The electric lever pushes the pressure plate downward. After contacting the mold, pressure is applied to the mold, thereby realizing the installation of the specimen and the subsequent installation of the mold.

[0055] Compared to existing technologies, this solution, through the design of the electric lever, eliminates the need for operators to apply pressure to the mold using a screw press or similar equipment. Furthermore, the use of a detachable frame effectively avoids obstruction of the operator during specimen placement by the frame and electric lever. The pressure plate design ensures that the pressure applied to the mold by the electric lever is evenly distributed along the top wall of the mold, preventing damage to the mold or specimen caused by uneven distribution. Since the pressure plate is rotatably connected to the electric lever, it rotates with the mold under friction after contact with the top wall. Compared to fixed connections, this solution effectively avoids friction between the pressure plate and the mold, preventing mold damage. The pressure plate design also provides some fixation to the mold, preventing displacement during pressurization and potential stripping, which could negatively impact subsequent impermeability tests.

[0056] In this solution, by arranging the pressure plate and the output end of the electric rod coaxially, the force applied to the pressure plate by the electric rod is distributed along the axial direction of the pressure plate, thereby making the force applied to the mold by the pressure plate also distributed along its axial direction. This helps to further avoid the mold axis tilting that may be caused by uneven pressure distribution, which could lead to damage to the mold or the test piece.

[0057] Example 3

[0058] The difference from the above embodiment is that: the outer wall of the mold is provided with several edges, the lever 29 is L-shaped, and the length of the segment of the lever 29 near the first rack 28 is less than the length of the segment near the turntable 21.

[0059] The specific implementation method is as follows: When using this solution, the design of the sharp angles makes the outer surface of the mold and the second rack 23 have more contact points. Compared with the solution of using a mold with a rounded surface, this solution can effectively reduce the risk of relative sliding between the mold and the second rack 23 and reduce the loss in the torque transmission process.

[0060] This solution changes the shape of the lever 29, increasing the movement distance of the end of the lever 29 closest to the turntable 21. Since both ends of the lever 29 have the same angular velocity, compared to using a shorter end of the lever 29 closest to the turntable 21, this solution reduces the range of motion required by the lever 29 while giving the end of the lever 29 closest to the turntable 21 a larger radius of motion, resulting in a greater linear velocity. Consequently, the lever 29 acts on the turntable 21 for a longer distance, which helps to increase the angle at which the lever 29 can rotate the mold with a single swing.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A mortar permeability tester, comprising a housing (1), wherein the housing (1) is provided with a pressure supply system, characterized in that: The top wall of the housing (1) is detachably connected to several molds via threads. The pressure supply system includes a water pump, and all molds are connected to the water pump. Several installation components (2) are provided inside the housing (1). Each installation component (2) includes a push rod (27). The push rod (27) is slidably engaged with the housing (1), and a first rack (28) is fixedly connected to any side wall of the push rod (27). A lever (29) is hinged to the inner wall of the housing (1). A first torsion spring is provided at the hinge point between the lever (29) and the housing (1). A turntable (21) is provided above the lever (29), and the turntable (21) is... The turntable (21) has an elongated hole (211) on it. The lever (29) slides through the elongated hole (211) and engages with the turntable (21). The bottom wall of the turntable (21) is rotatably connected to the top wall of the box (1). A second rack (23) is rotatably connected inside the turntable (21). The second rack (23) is arc-shaped and coaxially arranged with the adjacent mold. A first pawl (22) meshes on the second rack (23). The first pawl (22) is hinged to the top wall of the box (1). A second torsion spring is sleeved at the hinge of the first pawl (22) and the box (1).

2. The mortar impermeability tester according to claim 1, characterized in that: The second rack (23) is also engaged with a second pawl (222), which is hinged to the outer top wall of the housing (1). A third torsion spring is fitted at the hinge point between the second pawl (222) and the housing. The first pawl (22) and the second pawl (222) are arranged symmetrically, and a cam (221) is provided between the first pawl (22) and the second pawl (222). The cam (221) is rotatably connected to the outer wall of the housing (1).

3. The mortar impermeability tester according to claim 2, characterized in that: The installation assembly (2) also includes a pressure accumulator assembly, which includes a spring (25). The top and bottom ends of the spring (25) are fixedly connected to baffles (24), and the sidewall of the baffle (24) is slidably engaged with the inner sidewall of the housing (1). The baffle (24) located below the spring (25) is fixedly connected to the push rod (27). The inner sidewall of the housing (1) has several grooves (261), and the grooves (261) are all arranged below the spring (25). The sidewalls of the grooves (261) are all hinged to partitions (26), and a fourth torsion spring is sleeved at the hinge joint between the partitions (26) and the sidewalls of the grooves (261).

4. The mortar impermeability tester according to claim 1, characterized in that: The top wall of the box (1) is detachably connected to a frame, and several electric bars are installed on the frame.

5. A mortar impermeability tester according to claim 4, characterized in that: The output end of the electric lever is rotatably connected to a pressure plate.

6. A mortar impermeability tester according to claim 5, characterized in that: The pressure plate is arranged coaxially with the output end of the electric lever.

7. A mortar permeability tester according to claim 1, characterized in that: The outer wall of the mold has several sharp edges.

8. A mortar impermeability tester according to claim 3, characterized in that: The pressure supply system also includes a water storage tank, several regulating valves, and several pressure gauges. The water pump is connected to the output end of the water storage tank, all the regulating valves are connected to the water pump, all the pressure gauges are connected to the adjacent regulating valves, and all the pressure gauges are connected to the adjacent molds.

9. A mortar impermeability tester according to claim 8, characterized in that: A channel (241) is opened in the baffle (24) located above the spring (25). The output end of the channel (241) is connected to the mold, and the input end of the channel (241) is connected to the adjacent pressure gauge. A solenoid valve is provided at the connection between the channel (241) and the pressure gauge.

10. A mortar permeability tester according to claim 1, characterized in that: The lever (29) is L-shaped, and the length of the segment of the lever (29) near the first rack (28) is less than the length of the segment near the turntable (21).

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