CN111829925A

CN111829925A - Cement mortar fluidity detection device convenient for accurate measurement and operation method thereof

Info

Publication number: CN111829925A
Application number: CN202010682776.1A
Authority: CN
Inventors: 徐海堂; 姚锐奕; 曹俊; 张勇; 顾红兵
Original assignee: Jiangsu Huitong Testing Co ltd
Current assignee: Jiangsu Huitong Testing Co ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2020-10-27
Anticipated expiration: 2040-07-15
Also published as: CN111829925B

Abstract

The application relates to the field of cement mortar fluidity detecting instruments, and discloses a cement mortar fluidity detecting device convenient for accurate measurement and an operation method thereof, which solve the technical problem of complicated measurement operation in the prior art, and the cement mortar fluidity detecting device comprises a rack and a disc table top arranged on the rack, wherein a motor used for driving the disc table top to vibrate is arranged on the rack, and a conical die and a die sleeve are arranged on one side of the disc table top, which is far away from the rack; the disc table comprises a disc table top and is characterized by further comprising a controller used for controlling the motor, a measuring assembly is arranged on the disc table top and comprises a rotating shaft and a transparent rotating disc, the rotating shaft is rotatably connected to the outer side of the disc table top, the rotating disc is fixedly connected with the rotating shaft and located above the disc table top, the axis of the rotating disc coincides with the axis of the disc table top, scale marks are arranged on the rotating disc along the radial direction, and the zero scale marks of the scale marks coincide with the axis of the rotating disc. The method and the device have the advantages of simplifying operation steps of measurement and improving measurement efficiency.

Description

Cement mortar fluidity detection device convenient for accurate measurement and operation method thereof

Technical Field

The application relates to the technical field of cement mortar fluidity detection instruments, in particular to a cement mortar fluidity detection device convenient for accurate measurement and an operation method thereof.

Background

The cement mortar fluidity tester is mainly used for cement mortar fluidity tests, and the cement mortar fluidity represents a measure of the cement mortar fluidity, and generally, the lower the water requirement of the standard consistency of cement is, the better the performance of the cement is.

Chinese patent with publication number CN207439862U discloses a cement mortar fluidity apparatus, including chassis, support, disc desktop, power component, the support links firmly at the chassis middle part, the power component sets up in support one side, disc desktop sliding connection is on the support top, power component drive disc desktop reciprocates, disc desktop bottom face has linked firmly a plurality of spacing posts, a plurality of spacing pipes have been linked firmly on the chassis, spacing post inserts and inserts in spacing intraductally, spacing post and spacing pipe sliding connection.

During the operation, the experimenter places the middle part of disc desktop with the circular cone mould, makes the mortar of packing into in the circular cone mould in disc desktop vibration center department, and then can make the mortar can even quadriversal flow when the vibration, and the mortar forms a circle on the disc desktop, then the operator utilizes the dipperstick to measure the diameter of mortar to reach the mobility of mortar, in order to judge the performance of cement.

Disclosure of Invention

The application provides a cement mortar fluidity detection device convenient to accurate measurement, has solved the current measuring method complex operation of measuring the diameter of mortar through the dipperstick, problem of inefficiency, and it has the operating procedure of simplifying the measurement, has improved measurement of efficiency's effect.

The application is realized by the following technical scheme: a cement mortar fluidity detection device convenient for accurate measurement, which comprises a frame and a disc table surface arranged on the frame, the machine frame is provided with a motor for driving the disc table top to vibrate, one side of the disc table top, which is far away from the machine frame, is provided with a conical die and a die sleeve, the die sleeve and the conical die are spliced and fixed, the die sleeve is positioned above the conical die and also comprises a controller for controlling the motor, a measuring component is arranged on the disc table top, the measuring component comprises a rotating shaft and a transparent rotating disc, the rotating shaft is rotatably connected to the outer side of the disc tabletop, the rotating disc is fixedly connected with the rotating shaft and is positioned above the disc desktop, the axial lead of the rotating disc is coincident with the axial lead of the disc desktop, and scale marks are arranged on the rotating disc along the radial direction, and the zero scale mark of the scale mark is coincided with the axial lead of the rotating disc.

Through the technical scheme, during measurement, an operator pours the stirred cement mortar into the die sleeve and the conical die, so that the cement mortar is located at the circle center of the disc desktop, then the operator takes the die sleeve and the conical die off the disc desktop along the vertical direction, and controls the motor to work through the controller, at the moment, the disc desktop vibrates, and the cement mortar uses the circle center of the disc desktop as the center to flow and spread around and form a circle on the disc desktop. Then the operator rotates the axis of rotation to drive the rolling disc and move towards the top of disc desktop, until the axial lead of rolling disc and the axial lead of disc desktop coincide mutually, then the operator can directly see through the scale mark on the rolling disc and obtain the diameter of cement mortar, and judge the mobility and the performance of cement according to the diameter of cement mortar, easy operation is convenient, has improved measuring efficiency.

The application is further configured to: the top of rolling disc has set firmly eyepiece mechanism, eyepiece mechanism includes the sleeve and sets firmly the magnifying glass in the sleeve, the sleeve cover is established in the outside of rolling disc, just the periphery of rolling disc and telescopic interior week fixed connection, the magnifying glass is located the top of rolling disc.

Through the technical scheme, the arrangement of the magnifier amplifies the diameter of the cement mortar and the corresponding position on the rotating disc, so that the reading of an operator is facilitated, and the measurement accuracy is improved.

The application is further configured to: the one end that the rolling disc was kept away from to the sleeve is equipped with the dust board, set up convex logical groove on the telescopic lateral wall, it is the major arc to lead to the groove, lead to the groove and lie in the top of magnifying glass on vertical direction, in the dust board advances the sleeve through leading to the groove grafting, just the fixed axle has set firmly between the logical groove, the dust board is worn to establish by the fixed axle.

Through above-mentioned technical scheme, after the measurement finishes, the operator will keep off the dirt board and rotate round the fixed axle for in the dirt board wears to establish into the sleeve through leading to the groove, cover the top at the magnifying glass completely until keeping off the dirt board, thereby played the effect of sheltering from to the dust, reduced the dust and fallen on the magnifying glass and influence the possibility of the transmittance of magnifying glass, played the effect of keeping off the dirt.

The application is further configured to: and one end of the sleeve, which faces the disc desktop, is fixedly provided with an illuminating lamp.

Through above-mentioned technical scheme, during the measurement, light the light, the light is thrown light on, has improved the luminance of sleeve below to make things convenient for the operator to see scale mark and reading on the rolling disc clearly.

The application is further configured to: the outer side of the sleeve is fixedly provided with an extension plate along the periphery, the extension plate is positioned above the disc table top, and the extension plate extends to the outer side of the disc table top in the horizontal direction.

Through above-mentioned technical scheme, the extension board covers in the top of disc desktop in vertical direction, has played the effect of sheltering from to the dust in the air, has reduced the dust and has fallen to cause the influence to the smoothness on disc desktop surface on the disc desktop, and then causes the possibility of influence to the mobility of cement mortar on the disc desktop in the test procedure.

The application is further configured to: and the periphery of the disc table top is fixedly provided with a material blocking part for blocking cement mortar.

Through above-mentioned technical scheme, the effect that can play the barrier to cement mortar is kept off in the setting of material spare, has reduced the possibility that cement mortar overflows from the disc desktop.

The application is further configured to: keep off the material and select the rubber material to make for use, just it is the ascending round platform form of opening to keep off the material, keep off a pot head of material towards the disc desktop and establish in the outside of disc desktop and with disc desktop fixed connection.

Through above-mentioned technical scheme, when needs clear up the cement mortar that bonds on keeping off the material piece, the operator will keep off the material piece and turn in the opposite direction for the open end opening that keeps off the material piece is down, thereby makes things convenient for the operator to keep off the cement mortar clean up that bonds on the material piece.

The application is further configured to: one side that the frame was kept away from to the disc desktop is equipped with the connecting pipe along the outer peripheral edges, the connecting pipe is the circular-arc top that just is located the disc desktop of version, the outside rigid coupling of disc desktop has the bracing piece, the one end and the connecting pipe fixed connection of disc desktop are kept away from to the bracing piece, the through-hole has been seted up along length direction on the connecting pipe, the through-hole is used for blowing towards the disc desktop, the connecting pipe is used for being linked together with the mouth of blowing of air pump.

Through above-mentioned technical scheme, before the measurement, the operator blows towards the connecting tube through the air pump and blows, and then gas blows off through the through-hole, and gas blows off the dust on the disc desktop, has played the effect of further clearance to the disc desktop to it is not smooth and to the possibility that the mobility of cement mortar caused the influence to have reduced the disc surface.

The application is realized by the following technical scheme: an operating method of a cement mortar fluidity detection device for facilitating accurate reading measurement comprises the following operating steps:

sand filling: firstly, placing a conical die and a die sleeve on a disc table top to enable the axial leads of the conical die and the die sleeve to coincide with the axial lead of the disc table top, and then filling the stirred cement mortar into the conical die and the die sleeve;

cement mortar flowing: lifting the conical die and the die sleeve from the disc table top in the vertical direction, starting the motor through the controller, driving the disc table top to vibrate up and down for 20-30s by the motor, and enabling cement mortar to flow from the center of the circle to the periphery on the disc table top to form a circle;

measuring the fluidity of the cement mortar: and rotating the rotating disc along the rotating shaft until the axis of the rotating disc coincides with the axis of the disc desktop, reading the diameter of a circle formed by cement mortar through a magnifier, and judging the performance of cement.

Through the technical scheme, when the diameter of cement mortar is measured as required, the operator rotates the sleeve towards the top of disc desktop, make telescopic axial lead coincide with the axial lead of disc desktop mutually, then the operator can directly see through the magnifying glass and look over the diameter of cement mortar, and keep the position of the scale mark of aliging in the vertical direction on the external diameter of cement mortar and the rolling disc according to, read the diameter of cement mortar, thereby obtain the mobility and the performance of cement, and easy operation is convenient, and the measuring efficiency and precision are improved.

The application is further configured to: before the sand filling operation, the surface of the disc table top is wiped clean by a wet cloth.

Through the technical scheme, the disc table top is kept flat and smooth, and the possibility that the flowability of cement mortar on the disc table top is influenced is reduced.

In summary, the present application has the following beneficial effects:

1. the operation steps of measuring the diameter of the cement mortar by an operator are simplified, and the operation efficiency is improved;

2. the disc table top is kept flat and clean, and the possibility that the fluidity of cement mortar on the disc table top is affected is reduced.

Drawings

Fig. 1 is a schematic view illustrating a state in which the dust guard is located in the sleeve according to the present embodiment.

Fig. 2 is a schematic view showing a state in which the dust guard is located outside the sleeve in this embodiment.

Fig. 3 is a schematic structural diagram for embodying the measurement component in this embodiment.

Fig. 4 is a schematic structural diagram for showing the rotational connection relationship between the dust guard and the sleeve in the present embodiment.

Reference numerals: 1. a frame; 2. a disc tabletop; 21. a material blocking part; 22. a support bar; 23. a connecting rod; 3. an electric motor; 31. a cam; 4. a conical die; 5. die sleeve; 6. a controller; 7. a measurement assembly; 71. a rotating shaft; 72. rotating the disc; 73. a sleeve; 731. a through groove; 732. a fixed shaft; 733. an illuminating lamp; 734. an extension plate; 74. a magnifying glass; 75. a dust guard; 8. a connecting pipe; 81. a through hole; 82. a breather pipe; 9. an air pump.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1, the embodiment of the application discloses a cement mortar fluidity detection device convenient to accurate measurement, including frame 1 and the disc desktop 2 of setting on frame 1, be equipped with in frame 1 to be used for driving the motor 3 of disc desktop 2 vibration, still including being used for the controller 6 of driving motor work. The connecting rod 23 is rotatably connected below the disc table top 2, the connecting rod 23 is connected in a sliding mode along the vertical direction of the rack 1, the cam 31 is coaxially connected to the output end of the motor 3, and one end, far away from the disc table top 2, of the connecting rod is in contact with the cam 31.

Referring to fig. 1, a conical die 4 and a die sleeve 5 are placed on one side, deviating from a rack 1, of a disc desktop 2, the die sleeve 5 is fixedly spliced with the conical die 4, the die sleeve 5 is located above the conical die 4, the axial leads of the conical die 4 and the disc desktop 2 coincide with each other.

Referring to fig. 1, a connecting pipe 8 is arranged along the outer periphery of one side of the disc tabletop 2 away from the rack 1, the connecting pipe 8 is used for being communicated with an air blowing port of an air pump 9, and the connecting pipe 8 is connected with the air pump 9 through an air pipe 82. Connecting pipe 8 is that the version is circular-arc, and the outside of disc desktop 2 bonds and has bracing piece 22, and the one end that disc desktop 2 was kept away from to bracing piece 22 bonds fixedly with connecting pipe 8, and connecting pipe 8 passes through bracing piece 22 to be supported in the top of disc desktop 2, has seted up through-hole 81 along length direction on the connecting pipe 8, and through-hole 81 is used for blowing towards disc desktop 2.

Referring to fig. 1, before the detection, an operator activates the air pump 9, the air pump 9 inputs air into the connection pipe 8, and then the air is blown onto the disc table top 2 through the through hole 81, so that the surface of the disc table top 2 is cleaned. Then an operator places the die sleeve 5 and the conical die 4 on the disc table top 2, then pours the stirred cement mortar into the die sleeve 5 and the conical die 4, and then takes down the die sleeve 5 and the conical die 4 along the vertical direction, so that the cement mortar is distributed on the disc table top 2. Finally, an operator drives the motor 3 to work through the controller 6, so that the disc table top 2 is driven to vibrate up and down, cement mortar diffuses from the center to the periphery on the disc table top 2, the cement mortar forms a circle on the disc table top 2, the diameter of the cement mortar is measured, and the performance and the fluidity of cement are obtained according to the measured value.

Referring to fig. 1, a blocking member 21 for blocking cement mortar is fixedly arranged on the periphery of the disc tabletop 2, the blocking member 21 is made of rubber, the blocking member 21 is in a circular truncated cone shape with an upward opening, and one end of the blocking member 21 facing the disc tabletop 2 is sleeved on the outer side of the disc tabletop 2 and is fixedly bonded with the outer side of the disc tabletop 2. The arrangement of the material blocking part 21 is beneficial to playing a role of blocking cement mortar, and the possibility that the cement mortar flows down from the disc tabletop 2 is reduced; meanwhile, the material blocking part 21 has elasticity, so that an operator can conveniently turn the material blocking part 21 in the opposite direction and clean cement mortar bonded on the inner wall of the material blocking part 21.

Referring to fig. 2 and 3, the disc table top 2 is provided with a measuring assembly 7, and the measuring assembly 7 includes a rotating shaft 71 and a transparent rotating disc 72, and in this embodiment, the rotating disc 72 is made of transparent glass. The rotating shaft 71 is rotatably connected to the outer side of the disc table top 2 through a bearing, the rotating disc 72 is located above the disc table top 2, and one end, away from the disc table top 2, of the rotating shaft 71 is fixedly bonded to the rotating disc 72. The axis of the rotating disc 72 coincides with the axis of the disc table top 2, the rotating disc 72 is provided with scale marks along the radial direction, and the zero scale mark of the scale mark coincides with the axis of the rotating disc 72.

Referring to fig. 2 and 3, an eyepiece mechanism is fixedly arranged above the rotating disc 72, the eyepiece mechanism comprises a sleeve 73 and a magnifying lens 74, the magnifying lens 74 is positioned in the sleeve 73, and the outer side of the magnifying lens 74 is fixedly adhered to the inner wall of the sleeve 73. The sleeve 73 is sleeved outside the rotating disc 72, the periphery of the rotating disc 72 is fixedly bonded with the inner wall of the sleeve 73, the magnifier 74 is positioned above the rotating disc 72, and the illuminating lamp 733 is fixedly arranged at one end of the sleeve 73 facing the disc tabletop 2.

Referring to fig. 2 and 3, when it is necessary to measure the diameter of a circle formed by cement mortar, the operator rotates the rotating shaft 71 until the axis of the rotating disk 72 is fused with the axis of the disc table 2, and lights the illumination lamp 733. At this moment, the scale mark of the external diameter of cement mortar and the corresponding position on the rolling disc 72 aligns in vertical direction, and the scale mark on the rolling disc 72 is enlarged by the magnifying glass 74, so that an operator can conveniently read directly through the magnifying glass 74 to obtain the diameter of the cement mortar, thereby obtaining the performance and the fluidity of cement, being simple and convenient to operate, and improving the measuring accuracy.

Referring to fig. 2 and 3, after the measurement is completed, the operator rotates the sleeve 73 directly from above the disc table 2 by means of the rotating shaft 71. After the operator cleans the cement mortar on the disc table top 2, the operator rotates the sleeve 73 to the upper side of the disc table top 2 again. An extension panel 734 is adhered to the outer side of the sleeve 73 along the periphery of the sleeve, the extension panel 734 being positioned over the disk table top 2 and the extension panel 734 extending horizontally to the outer side of the disk table top 2. The extension panel 734 may cover the top of the disk table top 2 to help keep the disk table top 2 out of the dust and reduce the likelihood that airborne dust will fall onto the disk table top 2.

Referring to fig. 3 and 4, a dust guard plate 75 is arranged at one end of the sleeve 73, which is far away from the rotating disc 72, a circular arc-shaped through groove 731 is formed in the side wall of the sleeve 73, the through groove 731 is a major arc, the through groove 731 is located above the magnifying lens 74 in the vertical direction, the dust guard plate 75 is inserted into the sleeve 73 through the through groove 731, a fixing shaft 732 is vertically and fixedly arranged between the through grooves 731, the fixing shaft 732 penetrates through the dust guard plate 75, and the dust guard plate 75 is rotatably connected with the sleeve 73 through the fixing shaft 732. During measurement, the operator rotates the dust guard 75 out of the sleeve 73; after the measurement is finished, the operator rotates the dust blocking plate 75 into the sleeve 73 through the through groove 731, so that dust is blocked for the magnifier 74, and the possibility that the dust falls on the magnifier 74 to influence the transmittance of the magnifier 74 is reduced.

The implementation principle of the embodiment is as follows: before measurement, the disc tabletop 2 is cleaned, then the conical die 4 and the die sleeve 5 are placed on the disc tabletop 2, the axial lead of the conical die 4 and the axial lead of the die sleeve 5 coincide with the axial lead of the disc tabletop 2, then the stirred cement mortar is poured into the conical die 4 and the die sleeve 5, and then an operator takes the conical die 4 and the die sleeve 5 down from the disc tabletop 2 along the vertical direction. Then, the disc table top 2 is driven by the motor 3 to vibrate up and down for 20-30s, then the sleeve 73 is rotated to the upper part of the disc table top 2 through the rotating shaft 71, so that the axial lead of the sleeve 73 is coincided with the axial lead of the disc table top 2, at the moment, the diameter of the cement mortar corresponds to the scale marks on the rotating disc 72, and an operator can obtain the diameter of the cement mortar through the magnifying glass 74 and the scale marks on the rotating disc 72, so that the fluidity and the performance of cement are obtained.

The embodiment of the application also discloses an operation method of the cement mortar fluidity detection device for facilitating accurate reading measurement, which comprises the following operation steps:

sand filling: firstly, placing a conical die and a die sleeve on a disc table top to enable the axial leads of the conical die and the die sleeve to coincide with the axial lead of the disc table top, and then filling the stirred cement mortar into the conical die and the die sleeve; before the sand filling operation, the surface of the disc table top is wiped clean by a wet cloth, so that the possibility of influencing the fluidity of cement mortar due to the unsmooth surface of the disc table top is reduced.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The utility model provides a cement mortar fluidity detection device convenient to accurate measurement, includes frame (1) and sets up disc desktop (2) on frame (1), be equipped with motor (3) that are used for driving disc desktop (2) vibration on frame (1), cone mould (4) and die sleeve (5) have been placed to one side that disc desktop (2) deviate from frame (1), die sleeve (5) are fixed with cone mould (4) concatenation, just die sleeve (5) are located the top of cone mould (4), still including controller (6) that are used for controlling motor (3), its characterized in that: be equipped with measuring component (7) on disc desktop (2), measuring component (7) include axis of rotation (71) and transparent rolling disc (72), axis of rotation (71) rotate the outside of connecting in disc desktop (2), rolling disc (72) and axis of rotation (71) fixed connection and rolling disc (72) are located the top of disc desktop (2), the axial lead of rolling disc (72) and the axial lead of disc desktop (2) coincide mutually, radially be equipped with the scale mark on rolling disc (72), the zero scale mark of scale mark coincides mutually with the axial lead of rolling disc (72).

2. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 1, characterized in that: the top of rolling disc (72) has set firmly eyepiece mechanism, eyepiece mechanism includes sleeve (73) and sets firmly magnifying glass (74) in sleeve (73), the outside at rolling disc (72) is established in sleeve (73) cover, just the periphery of rolling disc (72) and the interior circumference fixed connection of sleeve (73), magnifying glass (74) are located the top of rolling disc (72).

3. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 2, characterized in that: one end of the sleeve (73) far away from the rotating disc (72) is provided with a dust blocking plate (75), a circular arc-shaped through groove (731) is formed in the side wall of the sleeve (73), the through groove (731) is an arc, the through groove (731) is located above the magnifying lens (74) in the vertical direction, the dust blocking plate (75) is inserted into the sleeve (73) through the through groove (731), a fixing shaft (732) is fixedly arranged between the through groove (731), and the dust blocking plate (75) is penetrated through by the fixing shaft (732).

4. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 3, characterized in that: and an illuminating lamp (733) is fixedly arranged at one end of the sleeve (73) facing the disc desktop (2).

5. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 3 or 4, characterized in that: an extension plate (734) is fixedly arranged on the outer side of the sleeve (73) along the periphery, the extension plate (734) is positioned above the disc table top (2), and the extension plate (734) extends to the outer side of the disc table top (2) in the horizontal direction.

6. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 1, characterized in that: the periphery of the disc table top (2) is fixedly provided with a material blocking part (21) for blocking cement mortar.

7. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 6, characterized in that: keep off material spare (21) and select the rubber material to make, just it is the ascending round platform form of opening to keep off material spare (21), keep off material spare (21) and establish in the outside of disc desktop (2) and with disc desktop (2) fixed connection towards a pot head of disc desktop (2).

8. The device for detecting fluidity of cement mortar convenient for accurate measurement according to claim 1, characterized in that: one side that frame (1) was kept away from in disc desktop (2) is equipped with connecting pipe (8) along outer peripheral edges, connecting pipe (8) are the top that the version is circular-arc and is located disc desktop (2), the outside rigid coupling of disc desktop (2) has bracing piece (22), the one end and connecting pipe (8) fixed connection of disc desktop (2) are kept away from in bracing piece (22), have seted up through-hole (81) along length direction on connecting pipe (8), and through-hole (81) are used for blowing towards disc desktop (2), connecting pipe (8) are used for being linked together with the mouth of blowing of air pump (9).

9. The method of operating a cement mortar fluidity detecting device for facilitating accurate reading measurement according to any one of claims 1 to 7, characterized by comprising the following operating steps:

sand filling: firstly, placing a conical die (4) and a die sleeve (5) on a disc table top (2) to ensure that the axial leads of the conical die (4) and the die sleeve (5) are superposed with the axial lead of the disc table top (2), and then filling the stirred cement mortar into the conical die (4) and the die sleeve (5);

cement mortar flowing: lifting the conical die (4) and the die sleeve (5) from the disc desktop (2) in the vertical direction, starting the motor (3) through the controller (6), driving the disc desktop (2) to vibrate up and down for 20-30s through the motor (3), and enabling cement mortar to flow on the disc desktop (2) from the center to the periphery to form a circle;

measuring the fluidity of the cement mortar: the rotating disc (72) is rotated along the rotating shaft (71) until the axial lead of the rotating disc (72) is coincident with the axial lead of the disc tabletop (2), then the diameter of a circle formed by cement mortar is read through a magnifier (74), and the performance of cement is judged.

10. A method of operating a cement mortar fluidity detecting device for facilitating accurate reading measurement according to claim 9, characterized in that: before the sand filling operation, the surface of the disc table top (2) is wiped clean by a wet cloth.