A method for determining the water requirement for normal consistency of cement

Abstract

The present invention discloses a method for determining the water requirement for normal consistency of cement, belonging to the technical field of determination of normal consistency of cement. Aiming at the problems of low working efficiency and lack of representativeness of the measurement results when determining the water requirement for normal consistency of cement, the method for determining the water requirement for normal consistency of cement is based on a control mixing ratio device, and the method for determining the water requirement for normal consistency of cement includes the following steps: S1. Select four portions of cement samples and mixing water in the same proportion, and separately feed them into four mixing cylinders of the control mixing ratio device; The present invention synchronously mixes and prepares four groups of cement paste samples through the control mixing ratio device, verifies the average value of the actual water requirement for normal consistency of cement, and its relative error value is within its allowable error range. The synchronous control preparation method of the cement paste samples is simple to operate, without the need to repeatedly prepare cement paste samples many times, greatly improving its working efficiency, and its measurement results are representative.

Description

Technical Field

[0001] The present invention belongs to the technical field of cement standard consistency determination, and particularly relates to a method for determining the water requirement for standard consistency of cement. Background Art

[0002] Cement is an important building material in concrete projects, and its quality directly determines the quality of concrete projects; in the process of testing the physical properties of cement, the main indicators determining the quality of cement, in addition to strength, also include soundness and setting time, and the testing of these two indicators is carried out on the basis of standard consistency paste, so preparing the standard consistency paste of cement is the key; and in the process of preparing the standard consistency paste of cement, accurately determining the water requirement for standard consistency is the determining factor.

[0003] The water requirement for standard consistency of different cement varieties and different batches of the same cement variety is different. Even if the data of the water requirement for standard consistency of cement of the same production brand is accumulated, only a general range is known, and it is normal to fluctuate up and down within this range. However, it is found in the actual testing process that the water requirement for standard consistency still needs to be found through experiments, and it has the following obvious defects:

[0004] ① During the testing process of cement whose brand is unknown, to find the water requirement for standard consistency requires repeated attempts and gradually approaching the water requirement for standard consistency, which not only reduces work efficiency but also wastes materials;

[0005] ② When calculating the water requirement for standard consistency, repeated measurements and calibrations are required. However, since the cement paste is prepared manually and then the cement paste is measured by the Vicat apparatus by the substitution method to obtain the penetration depth of the test needle, manually preparing the cement paste repeatedly is likely to have a large deviation from the initial measurement value, lacking comparative calibration data, thus easily resulting in the lack of representativeness of the measurement result.

[0006] Therefore, a method for determining the water requirement for standard consistency of cement is needed to solve the problems of low work efficiency and lack of representativeness of the measurement result in the prior art when determining the water requirement for standard consistency of cement. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for determining the water requirement for standard consistency of cement to solve the problems raised in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A method for determining the water requirement for standard consistency of cement, the method for determining the water requirement for standard consistency of cement is based on a control mixing ratio device, and the method for determining the water requirement for standard consistency of cement includes the following steps:

[0009] S1. Select four cement samples and mixing water in the same proportion, and send them into the four mixing cylinders of the control mixing ratio device respectively;

[0010] S2. Synchronously mix the cement samples and the mixing water in the four mixing cylinders through the mixing motor. After the mixing is completed, collect and process them through the four sampling cylinders respectively to form cement paste samples;

[0011] S3. For the cement paste samples collected in the four sampling cylinders, load the cement paste samples into the conical molds respectively, and measure the cement paste with the substitution Vicat apparatus to obtain four groups of test cone penetration depths;

[0012] S4. Substitute the test cone penetration depth in S3 into the theoretical formula P = -0.2230S + 35.1593 to calculate the theoretical water requirement for normal consistency of cement, where P is the water requirement for normal consistency of cement / %, and S is the test cone penetration depth / mm. And through the four groups of actual water consumption data for normal consistency of cement, take the average of the four groups of data, which is the actual water requirement for normal consistency of cement, and check it with the above formula.

[0013] It should be noted in the solution that the control mixing ratio device includes a workbench. One end inner wall of the workbench is fixedly provided with a fixed sleeve. Four mixing cylinders distributed in a circular pattern are fixedly inserted into the inner wall of the fixed sleeve. The top surface of the fixed sleeve is provided with a closing mechanism that cooperates with the bottom ends of the four mixing cylinders. Below the closing mechanism is a placing seat fixed to the top surface of the workbench. A sealing cover is fixedly connected to the top surfaces of the four mixing cylinders together. The outer surface of the workbench is provided with a lifting mechanism that cooperates with the sealing cover. The top surface of the sealing cover is provided with a synchronous proportioning mechanism that extends into the four mixing cylinders.

[0014] Furthermore, it is worth noting that the closing mechanism includes four sealing sheets distributed in a circular pattern. Two symmetrically distributed limiting grooves are opened on the bottom surface of each sealing sheet. A limiting column fixed to the bottom surface of the fixed sleeve is arranged inside the adjacent two limiting grooves. The center of the top surface of the fixed sleeve is rotatably connected with a rotating shaft a. Transmission gears are tightly sleeved on the outer surfaces of the top end and the bottom end of the rotating shaft a. Tooth teeth are arranged on the side wall of each sealing sheet close to the bottom transmission gear. The bottom transmission gear is meshed with the tooth teeth of the sealing sheet. The top surface of the fixed sleeve is rotatably connected with a rotating shaft b. A rotating gear is tightly sleeved on the outer surface of the rotating shaft b. The rotating gear is meshed with the adjacent transmission gear. The outer surface of the top end of the rotating shaft b is rotatably connected with a rotating rod.

[0015] As a preferred implementation manner, the bottom surface of the mixing cylinder and the bottom surface of the fixed sleeve are located on the same horizontal plane. The top surface of the sealing sheet is attached to the bottom surface of the fixed sleeve. The rotating rods are distributed in a cross shape.

[0016] It should be further explained that the lifting mechanism includes a U-shaped frame fixed to the top surface of the sealing cover, the workbench is provided with a lifting groove on the outer end surface of the U-shaped frame, a rotating frame fixed to the outer end surface of the workbench is arranged on the outer side of the lifting groove, the inner wall of the rotating frame is rotatably connected to a rotating shaft c, a servo motor coaxially connected to the rotating shaft c is installed on the outer end surface of the workbench, a lifting gear is fastened to the outer surface of the rotating shaft c, and the outer end surface of the U-shaped frame is provided with teeth meshing with the lifting gear.

[0017] Finally, it should be noted that the synchronous proportioning mechanism includes a mounting frame fixed to the top surface of the sealing cover, a mixing motor is arranged on the top surface of the mounting frame, a driving gear is fixed to the output end of the mixing motor through a coupling, and the bottom surface of the sealing cover is rotatably connected to four rotating shafts d extending to the inside of four mixing barrels respectively, and a driven gear is tightly sleeved on the top outer surface of each rotating shaft d, and the driving gear is meshed with the four driven gears, and a frame-type stirring rod tightly sleeved on the outer surface of the rotating shaft d is arranged inside the mixing barrel, and scraping rods are fixed to the bottom surfaces of both sides of each frame-type stirring rod, and spiral blades tightly sleeved on the rotating shaft d are arranged below the scraping rod.

[0018] As a preferred embodiment, the vertical cross-sections of the two scraping rods are distributed in an inverted figure eight shape, and the scraping rods and the frame-type stirring rods are in contact with the inner wall of the mixing barrel.

[0019] As a preferred embodiment, the vertical cross-section of the frame-type stirring rod is distributed in a sun shape, and the inner wall of each frame-type stirring rod is rotatably connected to two symmetrically distributed mixing blades.

[0020] Compared with the prior art, the method for determining the water consumption of cement standard consistency provided by the present invention has at least the following beneficial effects:

[0021] (1) Four groups of cement paste samples were mixed and prepared synchronously by a control mixing and proportioning device, and the cement paste was measured by a substitute Vicat instrument. The theoretical cement standard consistency water consumption calculated by the formula P = -0.2230S + 35.1593 was verified with the average value of the actual cement standard consistency water consumption of the four groups of cement paste samples. The relative error value was within the allowable error range. The synchronous control preparation method of the cement paste samples was simple to operate and did not require repeated preparation of cement paste samples, which greatly improved its work efficiency. In addition, the error between the measured water consumption data and the theoretical data was close, and the measurement results were representative.

[0022] (2) Through the synchronous proportioning mechanism, the four groups of cement paste samples are synchronously mixed, and through the sealing mechanism, the cement paste samples in the four mixing cylinders are synchronously discharged, which can ensure the unity and representativeness of the data when measuring the actual water consumption of the cement paste samples in the four mixing cylinders, thereby improving the accuracy of the subsequent verification process of theoretically measuring the water consumption through formulas by Diao. Brief Description of the Drawings

[0023] Figure 1 It is a schematic flow chart of the method of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the control mixing proportioning device of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the lifting mechanism of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the sealing piece of the present invention;

[0027] Figure 5 It is of the present invention Figure 4 Schematic enlarged structural diagram of area A;

[0028] Figure 6 It is a schematic diagram of the partial internal structure of the mixing cylinder of the present invention;

[0029] Figure 7 It is of the present invention Figure 6 Schematic enlarged structural diagram of area B;

[0030] Figure 8 It is of the present invention Figure 6 Schematic enlarged structural diagram of area C.

[0031] In the figure: 1, workbench; 2, fixed sleeve; 3, mixing cylinder; 4, sealing mechanism; 41, sealing piece; 42, limiting groove; 43, limiting post; 44, rotating shaft a; 45, transmission gear; 46, rotating shaft b; 47, rotating gear; 48, rotating rod; 5, placing seat; 6, sealing cover; 7, lifting mechanism; 71, U-shaped frame; 72, lifting groove; 73, rotating frame; 74, rotating shaft c; 75, servo motor; 76, lifting gear; 8, synchronous proportioning mechanism; 81, mounting frame; 82, mixing motor; 83, driving gear; 84, rotating shaft d; 85, driven gear; 86, frame-shaped stirring rod; 87, scraping rod; 88, spiral blade; 9, mixing blade. Detailed Embodiments

[0032] The present invention will be further described below in conjunction with embodiments.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions. Any simple improvement to the method of the present invention under the premise of the concept of the present invention falls within the scope of protection required by the present invention.

[0035] Please refer to Figures 1-8 , the present invention provides a method for determining the water requirement for normal consistency of cement. The method for determining the water requirement for normal consistency of cement is based on a control mixing ratio device, and the method for determining the water requirement for normal consistency of cement includes the following steps:

[0036] S1. Select four portions of cement samples and mixing water in the same proportion, and separately feed them into the four mixing cylinders 3 of the control mixing ratio device;

[0037] S2. Synchronously mix the cement samples and the mixing water in the four mixing cylinders 3 through the mixing motor 82. After the mixing is completed, collect and process them through four sampling cylinders respectively to form a cement paste sample;

[0038] S3. Put the cement paste samples collected in the four sampling cylinders into the conical molds respectively, and use the Vicat apparatus by the substitution method to measure the cement paste to obtain four groups of the penetration depths of the test needles;

[0039] Among them, put the cement paste into the conical mold, vibrate the conical mold multiple times, level it, and place it at a fixed position under the test needle of the Vicat apparatus by the substitution method. Lower the test needle to the surface of the cement paste, and let the test needle sink vertically and freely into the cement paste. Record the penetration depth of the test needle when the test needle stops sinking.

[0040] S4. Substitute the penetration depth of the test needle in S3 into the theoretical formula P = -0.2230S + 35.1593 to calculate the theoretical water requirement for normal consistency of cement, where P is the water requirement for normal consistency of cement / %, and S is the penetration depth of the test needle / mm. And through the four groups of actual water consumption data for normal consistency of cement, take the average value of the four groups of data as the actual water requirement for normal consistency of cement, and check it with the above formula, and the relative error value is less than 0.8%.

[0041] Further, as Figures 1-8As shown, it is worth specifically explaining that the control mixing ratio device includes a workbench 1. One end inner wall of the workbench 1 is fixedly provided with a fixed sleeve 2. Four mixing cylinders 3 distributed in a circular pattern are fixedly inserted into the inner wall of the fixed sleeve 2. A closing mechanism 4 matched with the bottom ends of the four mixing cylinders 3 is arranged on the top surface of the fixed sleeve 2. A placing seat 5 fixed to the top surface of the workbench 1 is arranged below the closing mechanism 4. A sealing cover 6 is fixedly arranged on the top surfaces of the four mixing cylinders 3 together. A lifting mechanism 7 matched with the sealing cover 6 is arranged on the outer surface of the workbench 1. A synchronous ratio mechanism 8 extending into the four mixing cylinders 3 is arranged on the top surface of the sealing cover 6.

[0042] Further, as shown in Figure 4 , Figure 5 and Figure 7 As shown, it is worth specifically explaining that the closing mechanism 4 includes four sealing sheets 41 distributed in a circular pattern. Two symmetrically distributed limiting grooves 42 are opened on the bottom surface of each sealing sheet 41. A limiting post 43 fixed to the bottom surface of the fixed sleeve 2 is arranged inside two adjacent limiting grooves 42. The center of the top surface of the fixed sleeve 2 is rotatably connected with a rotating shaft a44. Transmission gears 45 are tightly sleeved on the outer surfaces of the top end and the bottom end of the rotating shaft a44. Tooth teeth are arranged on the side wall of each sealing sheet 41 close to the bottom transmission gear 45. The bottom transmission gear 45 is meshed and connected with the tooth teeth of the sealing sheet 41. The top surface of the fixed sleeve 2 is rotatably connected with a rotating shaft b46. A rotating gear 47 is tightly sleeved on the outer surface of the rotating shaft b46. The rotating gear 47 is meshed and connected with the adjacent transmission gear 45. The top outer surface of the rotating shaft b46 is rotatably connected with a rotating rod 48.

[0043] Further Figure 4 and Figure 7 As shown, it is worth specifically explaining that the bottom surface of the mixing cylinder 3 and the bottom surface of the fixed sleeve 2 are located on the same horizontal plane. The top surface of the sealing sheet 41 is attached to the bottom surface of the fixed sleeve 2. The rotating rod 48 is distributed in a cross shape. The shape setting of the rotating rod 48 is convenient for manual rotation, so as to synchronously discharge the mixed cement paste sample.

[0044] Further, as shown in Figure 2 As shown, it is worth specifically explaining that the lifting mechanism 7 includes a U-shaped frame 71 fixed to the top surface of the sealing cover 6. A lifting groove 72 is opened on the outer end surface of the workbench 1 where the U-shaped frame 71 is located. A rotating frame 73 fixed to the outer end surface of the workbench 1 is arranged outside the lifting groove 72. A rotating shaft c74 is rotatably connected to the inner wall of the rotating frame 73. A servo motor 75 coaxially connected with the rotating shaft c74 is installed on the outer end surface of the workbench 1. A lifting gear 76 is tightly sleeved on the outer surface of the rotating shaft c74. Tooth teeth meshed with the lifting gear 76 are arranged on the outer end surface of the U-shaped frame 71.

[0045] Further, as shown in Figure 2 ,Figure 3 , Figure 6 and Figure 8 As shown in Figure 3 , Figure 6 and Figure 8 , it is worth specifically explaining that the synchronous ratio mechanism 8 includes a mounting frame 81 fixed to the top surface of the sealing cover 6. A mixing motor 82 is arranged on the top surface of the mounting frame 81. The output end of the mixing motor 82 is fixed with a driving gear 83 through a coupling. Four rotating shafts d84 respectively extending into the four mixing cylinders 3 are rotatably connected to the bottom surface of the sealing cover 6. The outer surface of the top end of each rotating shaft d84 is tightly sleeved with a driven gear 85. The driving gear 83 is meshed with the four driven gears 85. A frame-type stirring rod 86 tightly sleeved on the outer surface of the rotating shaft d84 is arranged inside the mixing cylinder 3. Scraping rods 87 are fixed to the bottom surfaces on both sides of each frame-type stirring rod 86. A spiral blade 88 tightly sleeved on the rotating shaft d84 is arranged below the scraping rod 87.

[0046] Furthermore, as shown in Figure 8 it is worth specifically explaining that the vertical cross-sections of the two scraping rods 87 are distributed in an inverted V shape. The scraping rods 87 and the frame-type stirring rods 86 are both in contact with the inner wall of the mixing cylinder 3. The shapes of the scraping rods 87 and the frame-type stirring rods 86 are set to prevent the residual phenomenon of the cement paste sample from occurring on the inner wall of the mixing cylinder 3 during preparation, thereby improving the uniformity and representativeness of the preparation of the cement paste samples in the four mixing cylinders 3 to a certain extent.

[0047] Furthermore, as shown in Figure 6 and Figure 8 it is worth specifically explaining that the vertical cross-section of the frame-type stirring rod 86 is distributed in a Chinese character 'Ri' shape. Two symmetrically distributed mixing blades 9 are rotatably connected to the inner wall of each frame-type stirring rod 86. The setting of the mixing blades 9 further improves the uniformity of the cement paste sample in the mixing cylinder 3 during preparation, thereby accurately determining the actual water consumption for subsequent use.

[0048] This solution has the following working process: When measuring the actual standard consistency water consumption, four cement samples and mixing water of the same proportion are selected. First, by rotating the rotating rod 48, and through the meshing transmission of the rotating gear 47 and the transmission gear 45, the transmission gear 45 meshes and drives with the four sealing sheets 41, so that the bottoms of the four mixing cylinders 3 are hermetically treated. Then, the servo motor 75 drives the lifting gear 76 to rotate, so that the U-shaped frame 71 drives the sealing cover 6 to move upward synchronously. At this time, they are respectively sent into the four mixing cylinders 3 of the control mixing ratio device. Through the reverse drive of the servo motor 75, the sealing cover 6 can hermetically treat the four mixing cylinders 3. Driven by the mixing motor 82, and through the meshing transmission of the driving gear 83 and the four driven gears 85, the rotating shafts d84 in the four mixing cylinders 3 rotate synchronously in the same direction, and drive the frame-shaped stirring rods 86, scraping rods 87, and spiral blades 88 to rotate synchronously, so that the cement paste in the four mixing cylinders 3 is in exactly the same state during preparation. Finally, by rotating the rotating rod 48 in the reverse direction, the bottoms of the four mixing cylinders 3 are opened through the synchronous movement of the sealing sheets 41, and are respectively collected by the four sampling cylinders placed in the placement seat 5 to form cement paste samples. The cement paste samples are respectively filled into the conical molds, and the cement paste is measured by the substitution method Vicat apparatus to obtain four groups of test cone sinking depths. The test cone sinking depths are brought into the formula P = -0.2230S + 35.1593 to calculate the theoretical cement standard consistency water consumption, and through the four groups of actual water consumption data of the cement standard consistency, the average value of the four groups of data is taken as the actual cement standard consistency water consumption, and is verified with the above formula, and its relative error value is less than 0.8%.

[0049] According to the above working process, it can be seen that: through the control mixing ratio device, four groups of cement paste samples are synchronously mixed and prepared, and the cement paste is measured by the substitution method Vicat apparatus. In cooperation with the theoretical cement standard consistency water consumption calculated in the formula P = -0.2230S + 35.1593, it is verified with the average value of the actual cement standard consistency water consumption of the four groups of cement paste samples. Its relative error value is within its allowable error range. The synchronous control preparation method of the cement paste sample is simple to operate, without repeatedly preparing the cement paste sample many times, greatly improving its work efficiency, and the error between the measured water consumption data and the theoretical data is close, and its measurement result is representative.

[0050] Both the mixing motor 82 and the servo motor 75 can be purchased on the market. The mixing motor 82 and the servo motor 75 are both equipped with power supplies, which are mature technologies in this field and have been fully disclosed, so they are not repeated in the specification.

[0051] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The words such as "including" or "comprising" used in the present invention mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words such as "connected" or "coupled" do not limit to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for determining the water requirement for normal consistency of cement, characterized in that, The method for determining the water requirement for normal consistency of cement is based on a control mixing ratio device, and the method for determining the water requirement for normal consistency of cement includes the following steps: S1. Select four cement samples and mixing water in the same proportion, and respectively feed them into four mixing cylinders (3) of the control mixing ratio device; S2. Synchronously mix the cement samples and the mixing water in the four mixing cylinders (3) through a mixing motor (82). After the mixing is completed, collect and process them through four sampling cylinders respectively to form a neat cement paste sample; S3. For the neat cement paste samples collected in the four sampling cylinders, load the neat cement paste samples into the conical molds respectively, and use the substitution Vicat apparatus to measure the neat cement paste to obtain four groups of test cone penetration depths; S4. Substitute the test cone penetration depth in S3 into the theoretical formula P = -0.2230S + 35.1593 to calculate the theoretical water requirement for normal consistency of cement, where P is the water requirement for normal consistency of cement / %, and S is the test cone penetration depth / mm. And through four groups of actual water requirement data for normal consistency of cement, take the average value of the four groups of data, which is the actual water requirement for normal consistency of cement, and check it with the above formula; The control mixing ratio device includes a workbench (1). One end inner wall of the workbench (1) is fixedly provided with a fixed sleeve (2). Four mixing cylinders (3) distributed in a circular pattern are fixedly inserted into the inner wall of the fixed sleeve (2). A closing mechanism (4) matched with the bottom ends of the four mixing cylinders (3) is arranged on the top surface of the fixed sleeve (2). A placing seat (5) fixed to the top surface of the workbench (1) is arranged below the closing mechanism (4). A sealing cover (6) is fixedly arranged on the top surfaces of the four mixing cylinders (3). A lifting mechanism (7) matched with the sealing cover (6) is arranged on the outer surface of the workbench (1). A synchronous proportioning mechanism (8) extending into the four mixing cylinders (3) is arranged on the top surface of the sealing cover (6); The closing mechanism (4) includes four sealing sheets (41) distributed in a circular pattern. Two symmetrically distributed limiting grooves (42) are formed in the bottom surface of each sealing sheet (41). A limiting column (43) fixed to the bottom surface of the fixed sleeve (2) is arranged inside adjacent two limiting grooves (42). A rotating shaft a (44) is rotatably connected to the center of the top surface of the fixed sleeve (2). Driving gears (45) are tightly sleeved on the outer surfaces of the top end and the bottom end of the rotating shaft a (44). Tooth teeth are arranged on the side wall of each sealing sheet (41) close to the bottom driving gear (45). The driving gear (45) at the bottom is meshed and connected with the tooth teeth of the sealing sheet (41). A rotating shaft b (46) is rotatably connected to the top surface of the fixed sleeve (2). A rotating gear (47) is tightly sleeved on the outer surface of the rotating shaft b (46). The rotating gear (47) is meshed and connected with the adjacent driving gear (45). A rotating rod (48) is rotatably connected to the outer surface of the top end of the rotating shaft b (46); The lifting mechanism (7) includes a U-shaped frame (71) fixed to the top surface of the sealing cover (6). The workbench (1) is provided with a lifting groove (72) at the outer end surface of the U-shaped frame (71). A rotating frame (73) fixed to the outer end surface of the workbench (1) is arranged outside the lifting groove (72). A rotating shaft c (74) is rotatably connected to the inner wall of the rotating frame (73). A servo motor (75) coaxially connected to the rotating shaft c (74) is installed on the outer end surface of the workbench (1). A lifting gear (76) is tightly sleeved on the outer surface of the rotating shaft c (74). Teeth meshing with the lifting gear (76) are arranged on the outer end surface of the U-shaped frame (71).

2. The method for measuring the water requirement for normal consistency of cement according to claim 1, wherein: The bottom surface of the mixing cylinder (3) and the bottom surface of the fixed sleeve (2) are on the same horizontal plane. The top surface of the sealing sheet (41) is attached to the bottom surface of the fixed sleeve (2). The rotating rods (48) are distributed in a cross shape.

3. A method for measuring the water requirement for normal consistency of cement according to claim 2, characterized in that: The synchronous proportioning mechanism (8) includes a mounting frame (81) fixed to the top surface of the sealing cover (6). A mixing motor (82) is arranged on the top surface of the mounting frame (81). A driving gear (83) is fixed to the output end of the mixing motor (82) through a coupling. Four rotating shafts d (84) respectively extending into the four mixing cylinders (3) are rotatably connected to the bottom surface of the sealing cover (6). A driven gear (85) is tightly sleeved on the outer surface of the top end of each rotating shaft d (84). The driving gear (83) is meshed with the four driven gears (85). A frame-type stirring rod (86) tightly sleeved on the outer surface of the rotating shaft d (84) is arranged inside the mixing cylinder (3). Scraping rods (87) are fixed to both bottom sides of each frame-type stirring rod (86). A spiral blade (88) tightly sleeved on the rotating shaft d (84) is arranged below the scraping rod (87).

4. A method for measuring the water requirement for normal consistency of cement according to claim 3, characterized in that: The vertical cross-sections of the two scraping rods (87) are distributed in an inverted V shape. The scraping rods (87) and the frame-type stirring rods (86) are both in contact with the inner wall of the mixing cylinder (3).

5. A method for measuring the water requirement for normal consistency of cement according to claim 4, characterized in that: The vertical cross-section of the frame-type stirring rod (86) is distributed in a rectangle with a horizontal bar in the middle. Two symmetrically distributed mixing blades (9) are rotatably connected to the inner wall of each frame-type stirring rod (86).

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