CN213843270U - Expansion rate test instrument - Google Patents
Expansion rate test instrument Download PDFInfo
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- CN213843270U CN213843270U CN202022222802.0U CN202022222802U CN213843270U CN 213843270 U CN213843270 U CN 213843270U CN 202022222802 U CN202022222802 U CN 202022222802U CN 213843270 U CN213843270 U CN 213843270U
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Abstract
The utility model provides an expansion ratio test instrument, includes the cup and the bowl cover of mutually supporting, be equipped with the measured object overflow mouth on the cup, the internal surface of bowl cover be equipped with the oral area matched with diaphragm of cup, the diaphragm with the bowl cover forms standard liquid and holds the chamber, be equipped with on the bowl cover with the notes liquid hole that the chamber intercommunication was held to standard liquid, still be equipped with on the bowl cover with the standard liquid holds the standard liquid overflow mouth of chamber intercommunication. The expansion volume change of the measured object is converted into the deformation of the diaphragm by the instrument based on the expansion transfer principle in the relatively closed container, and then the deformation of the diaphragm is converted into the overflow of the standard liquid, so that the expansion volume change of the measured object can be indirectly calculated by the change of the total weight and the known density of the standard liquid. The method is suitable for testing the cement grouting material.
Description
Technical Field
The utility model relates to a cement grout material technical field specifically is an expansion ratio test instrument.
Background
The micro-expansibility of the pore grouting material has important significance in the construction of post-tensioned prestressed bridges: the prestressed pipeline can be compact, the prestressed steel strand is protected from being rusted, and effective stress transfer between the prestressed steel strand and a concrete structure is guaranteed, so that the service life of the bridge is prolonged.
The cement slurry expansion is divided into an early expansion and a post-hardening expansion, and the volume expansion which is generated after mixing with water and continues to initial setting is the early expansion, and the post-hardening expansion is generated in the setting and hardening process, and the volume expansion accompanying the generation of the expansive hydration product is expressed by the expansion rate.
At present, a common method JT/T946-2014 (annex D cement paste free bleeding rate and free expansion rate test) for a highway engineering prestressed duct grouting material test is used for calculating the free bleeding rate and the free expansion rate by observing the water surface, the pulp surface and the expansion surface of grout and measuring the height of the grout on the outer surface of a transparent container according to the cement paste bleeding rate expansion rate test principle. Through multiple tests, the fact that when the method is used for carrying out test operation, human errors and instrument errors in the measuring process are large, the precision requirement of measured data and the reproducibility requirement of test results are difficult to achieve, the objective fairness of the test results is influenced, and the specific problems are as follows:
1. because suspended matters and micro-powder are often adhered to the inner wall of the measuring tool on the bleeding water surface and are difficult to clean, the observation and judgment of the liquid level can be directly influenced, and the test requires that the measurement precision of the liquid level height reaches 0.2mm, so that the requirement is difficult to meet;
2. the expansion slurry surface is influenced by surface tension and capillary action and is expressed as a concave liquid surface, because the expansion slurry is not transparent, only the upper edge of the concave liquid surface can be observed outside a container, and sometimes, because settled particles are naturally accumulated under the influence of various factors, the interface is fuzzy, and the test requires that the slurry surface height measurement precision is also 0.2mm, so the expansion rate is difficult to measure;
3. because a steel plate ruler is generally adopted for measurement, the scale value of the steel plate ruler is 1mm, the foremost end is 0.5mm, and the width of the scale is 0.1-0.2 mm, the precision requirement of 0.2mm is difficult to meet, and the vernier caliper cannot be used due to the limitation of an operation space;
4. if a 1000ml measuring cylinder is used, the initial height cannot be directly measured due to the influence of the base of the measuring cylinder.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an expansion ratio test instrument to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
an expansion rate test instrument comprises a cup body and a cup cover which are mutually matched, wherein a measured object overflow port is formed in the cup body, a diaphragm matched with the opening of the cup body is arranged on the inner surface of the cup cover, a standard liquid containing cavity is formed by the diaphragm and the cup cover, a liquid injection hole communicated with the standard liquid containing cavity is formed in the cup cover, and a standard liquid overflow port communicated with the standard liquid containing cavity is also formed in the cup cover; during the test, firstly, a measured object is injected into the cup body until the measured object overflows from the overflow port of the measured object, then the cup cover is sealed and installed on the cup body, at the moment, the measured object in the cup body continuously overflows under the extrusion of the diaphragm and the air in the cup body is also discharged, the air and the measured object are sealed and blocked at the overflow port of the measured object after the overflow is finished, then, standard liquid is injected into the liquid injection hole until the standard liquid overflows from the overflow port of the standard liquid, and the liquid injection hole is sealed and blocked after the standard liquid overflows.
The expansion volume change of the measured object is converted into the deformation of the diaphragm by the instrument based on the expansion transfer principle in the relatively closed container, and then the deformation of the diaphragm is converted into the overflow of the standard liquid, so that the expansion volume change of the measured object can be indirectly calculated by the change of the total weight and the known density of the standard liquid.
Further, the overflow port of the measured object is arranged on the side wall of the opening part of the cup body. When the specific position design of testee overflow mouth, will guarantee with the sealed lid of bowl cover is adorned on the cup, the air in the cup can be discharged completely.
Furthermore, a sealed cover of the overflow port of the measured object is arranged outside the overflow port of the measured object in a sealed mode. And a sealing ring is arranged between the sealing cover of the overflow port of the measured object and the overflow port of the measured object. The sealing cover of the overflow port of the measured object can effectively prevent the measured object from leaking when expanding, thereby improving the measurement precision.
Further, the deformation elastic force of the diaphragm is larger than the surface tension of the object to be measured when the object to be measured is not expanded and smaller than the expansion force of the object to be measured. The sealed lid of bowl cover is adorned promptly when on the cup, the diaphragm can not take place to deform, and when the testee takes place to expand, the diaphragm can be along with the inflation of testee takes place to deform. Just so can guarantee before the measured object takes place the inflation, the volume of the measured object in the cup is predetermined constant volume to measurement accuracy has further been improved.
Further, the shape of the diaphragm is a spherical crown shape. By designing the shape of the diaphragm into a spherical crown shape, the air in the cup body can be completely exhausted when the cup cover sealing cover is arranged on the cup body, so that the measurement precision is further improved. The diaphragm is connected with the cup cover in a sealing way.
Furthermore, the liquid injection hole is formed in the top surface of the cup cover, and a liquid injection hole sealing cover is installed at the liquid injection hole in a sealing mode. The liquid injection hole is formed in the top surface of the cup cover, so that standard liquid can be conveniently injected; meanwhile, the sealing cover of the liquid injection hole can effectively prevent standard liquid from volatilizing, so that the measurement precision is improved.
Further, the standard liquid overflow port is arranged on the side wall of the cup cover. The standard liquid overflow port is arranged on the side wall of the cup cover, so that the standard liquid can overflow conveniently.
Further, a check valve is connected to the standard liquid overflow port in a sealing mode. The check valve is a micro back check valve. The added check valve can effectively prevent standard liquid from volatilizing, thereby further improving the measurement precision.
Further, the maximum height of the liquid injection hole is larger than that of the standard liquid overflow port. The maximum height of the liquid injection hole is designed to be larger than that of the standard liquid overflow port, so that air in the standard liquid overflow port during testing can be avoided, and the measurement precision is further improved.
The instrument further comprises a weighing sensor, and the cup body is placed on the weighing sensor. The added weighing sensor can realize the on-line weighing and automatic monitoring functions of the instrument without manual monitoring, thereby greatly reducing the labor intensity of the test.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the instrument converts the expansion volume change of a measured object into the deformation of the diaphragm based on the expansion transfer principle in the relatively closed container, and then converts the deformation of the diaphragm into the overflow of the standard liquid, so that the expansion volume change of the measured object can be indirectly calculated through the change of the total weight and the known density of the standard liquid, and the expansion volume change of the measured object can be calculated only by measuring the change of the total weight, so the measurement is simple and the precision is high;
2. the instrument can also measure the density of the measured object;
3. the added sealing cover for the overflow port of the measured object can effectively prevent the measured object from leaking when the measured object expands, thereby improving the measurement precision;
4. the deformation elasticity of the diaphragm is designed to be larger than the surface tension of the measured object when the measured object is not expanded and smaller than the expansion force of the measured object, so that the volume of the measured object in the cup body is a preset constant volume before the measured object is expanded, and the measurement precision is further improved;
5. the shape of the diaphragm is designed to be spherical crown shape, so that the air in the cup body can be completely discharged when the cup cover sealing cover is arranged on the cup body, and the measurement precision is further improved;
6. the liquid injection hole is formed in the top surface of the cup cover, so that standard liquid can be conveniently injected;
7. the sealing cover of the liquid injection hole can effectively prevent standard liquid from volatilizing, thereby improving the measurement precision;
8. the standard liquid overflow port is arranged on the side wall of the cup cover, so that the standard liquid can overflow conveniently;
9. the added check valve can effectively prevent standard liquid from volatilizing, thereby further improving the measurement precision;
10. the maximum height of the liquid injection hole is designed to be larger than that of the standard liquid overflow port, so that air in the standard liquid overflow port during testing can be avoided, and the measurement precision is further improved;
11. the added weighing sensor can realize the on-line weighing and automatic monitoring functions of the instrument without manual monitoring, thereby greatly reducing the labor intensity of the test.
Drawings
FIG. 1 is a schematic diagram of an expansion ratio testing apparatus.
Fig. 2 is a schematic diagram of the important dimension structure of the instrument.
As shown in the figure: the device comprises a cup body 1, a measured object overflow port 1a, a cup cover 2, a liquid injection hole 2a, a standard liquid overflow port 2b, a diaphragm 3, a standard liquid accommodating cavity 4, a measured object overflow port sealing cover 5, a sealing ring 6, a liquid injection hole sealing cover 7, a one-way valve 8 and a weighing sensor 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, in an embodiment of the present invention, an expansion ratio testing apparatus includes a cup body 1 and a cup cover 2, which are matched with each other, an external thread connected to the cup body 1 is processed on a lower portion of the cup cover 2, a measured object overflow port 1a is provided on the cup body 1, a diaphragm 3 matched with an opening portion of the cup body 1 is provided on an inner surface of the cup cover 2, the diaphragm 3 and the cup cover 2 form a standard liquid accommodating chamber 4, the diaphragm 3 and the cup body 1 form a measured object accommodating chamber, a liquid injection hole 2a communicated with the standard liquid accommodating chamber 4 is provided on the cup cover 2, and a standard liquid overflow port 2b communicated with the standard liquid accommodating chamber 4 is further provided on the cup cover 2; during the test, firstly, the measured object is injected into the cup body 1 until the measured object overflows from the measured object overflow port 1a, then the cup cover 2 is sealed and installed on the cup body 1, at the moment, the measured object in the cup body 1 continuously overflows under the extrusion of the diaphragm 3, the air in the cup body 1 is also discharged, the air and the measured object are sealed and blocked at the measured object overflow port 1a after the overflow of the measured object is finished, then the standard liquid is injected into the liquid injection hole 2a until the standard liquid overflows from the standard liquid overflow port 2b, and the liquid injection hole 2a is sealed and blocked after the standard liquid overflows. The expansion volume change of the measured object is converted into the deformation of the diaphragm 3 by the instrument based on the expansion transfer principle in the relatively closed container, and then the deformation of the diaphragm 3 is converted into the overflow of the standard liquid, so that the expansion volume change of the measured object can be indirectly calculated through the change of the total weight and the known density of the standard liquid, and the expansion volume change of the measured object can be calculated only by measuring the change of the total weight, so that the measurement is simple and the precision is high.
The overflow port 1a for the measured object is arranged on the side wall of the opening part of the cup body 1. When the specific position design of testee overflow mouth 1a, will guarantee with the sealed dress of bowl cover 2 is in on the cup 1, the air in the cup 1 can be discharged completely. And a sealed cover 5 of the overflow port of the measured object is arranged outside the overflow port 1a of the measured object in a sealing way. And a sealing ring 6 is arranged between the sealing cover 5 of the overflow port of the measured object and the overflow port 1a of the measured object. The sealing cover 5 for the overflow port of the measured object can effectively prevent the measured object from leaking when expanding, thereby improving the measurement precision.
The deformation elasticity of the diaphragm 3 is larger than the surface tension of the object to be measured when the object to be measured is not expanded and smaller than the expansion force of the object to be measured. The sealed lid of bowl cover 2 will be guaranteed promptly to be adorned when on cup 1, diaphragm 3 can not take place to deform, and when the testee takes place to expand, diaphragm 3 can be along with the inflation of testee takes place to deform. Just so can guarantee before the measured object takes place the inflation, the volume of the measured object in the cup 1 is predetermined constant volume to measurement accuracy has further been improved. The diaphragm 3 is spherical in shape. By designing the diaphragm 3 to have a spherical crown shape, it is ensured that air in the cup body 1 can be completely discharged when the cup cover 2 is hermetically mounted on the cup body 1, thereby further improving the measurement accuracy. The diaphragm 3 is connected with the cup cover 2 in a sealing way.
In order to select the diaphragm 3 with the optimal shape, an expansion diaphragm shape test is performed, and in the expansion diaphragm shape test, a plane film, a conical film and a spherical crown film are used for comparison test, and the following results are found:
the planar membrane also can satisfy cement grout material inflation rate and detect the requirement, nevertheless the gas phenomenon of pressing from both sides between the in-process diaphragm 3 of screwing up bowl cover 2 and the cement grout material can not guarantee that diaphragm 3 and cement grout material fully contact, is difficult to the exhaust gas, influences the inflation rate and detects the precision.
The conical membrane can also satisfy cement grout material expansion rate and detect the requirement, but the elasticity centrum head produces the deformation when screwing up bowl cover 2, influences the air escape, and the corresponding cement grout material expansion rate that influences detects the precision.
Spherical cap shape diaphragm 3 when satisfying cement grout material expansion ratio detection requirement, can discharge cement grout material upper portion air completely when screwing up bowl cover 2, ensure cement grout material and diaphragm 3 fully contact, 3 diaphragms are indeformable under the action of gravity of upper portion water, produce ascending effort to the spherical cap membrane for F like the thick liquid, cement grout material upper cover water cavity and membrane water ensure that diaphragm 3 does not produce deformation to diaphragm 3 produces the downward action of gravity of 2F, ensure cement grout material expansion ratio detection precision.
The liquid injection hole 2a is arranged on the top surface of the cup cover 2, and a liquid injection hole sealing cover 7 is hermetically arranged at the liquid injection hole 2 a. The liquid injection hole 2a is arranged on the top surface of the cup cover 2, so that the standard liquid is conveniently injected; meanwhile, the sealing cover 7 of the liquid injection hole can effectively prevent standard liquid from volatilizing, thereby improving the measurement precision. The standard liquid overflow port 2b is arranged on the side wall of the cup cover 2. The standard liquid overflow port 2b is arranged on the side wall of the cup cover 2, so that the standard liquid can overflow conveniently. The standard liquid overflow port 2b is connected with a one-way valve 8 in a sealing way. The one-way valve 8 is a tiny back one-way valve. The added check valve 8 can effectively prevent standard liquid from volatilizing, thereby further improving the measurement precision. The maximum height of the liquid injection hole 2a is larger than that of the standard liquid overflow port 2 b. The maximum height of the liquid injection hole 2a is designed to be larger than that of the standard liquid overflow port 2b, so that air in the standard liquid overflow port 2b during test can be avoided, and the measurement precision is further improved.
The instrument further comprises a load cell 9, said cup 1 resting on said load cell 9. The added weighing sensor 9 can realize the on-line weighing and automatic monitoring functions of the instrument without manual monitoring, thereby greatly reducing the labor intensity of the test. And the weighing sensor 9 with the precision of five thousandths is used for accurately measuring the weight in the test process and is connected with an upper computer (such as a numerical control machine) to realize real-time communication.
The measured object in this embodiment is a cement grouting material, but may also be other similar materials, and the standard liquid is water, but may also be other liquid with known density.
The principle of the instrument is as follows: when a liquid in a closed container is still under pressure at one point, the pressure is transmitted to any point of the communicating vessel through the liquid, and the pressure value is equal everywhere. When the cement grouting material expands, certain pressure is generated on the diaphragm 3 to deform the diaphragm, water on the upper part is extruded to overflow and be discharged, the whole weight is reduced, the density of water at normal temperature and normal pressure is close to 1g/cm3, and the volume of the water is equal to the volume of the discharged water, namely the expansion volume of the cement grouting material.
The embodiment also provides an expansion ratio testing method, which comprises the following steps,
s1: weighing the empty weight G of a closed container (i.e. the apparatus without the weighing cell 9) not containing the object to be measured0；
S2: filling the measured object accommodating cavity of the closed container with the measured object, and sealing;
s3: filling standard liquid into a standard liquid accommodating cavity of the closed container, and sealing a liquid injection hole for filling the standard liquid;
s4: weighing the total weight G of the closed container filled with the measured object and the standard solution2；
S5: starting timing, weighing the weight G of the expanded closed container when the time T is measuredT；
S6: the expansion ratio of the measured object is G when the time T is calculated2-GT/ρVy100%, wherein ρ is the density of the standard solution, VyThe volume of the accommodating cavity of the measured object.
The weight can be weighed by the weighing sensor 9, and the measured object containing cavity is isolated from the standard liquid containing cavity by the diaphragm capable of elastically deforming.
When the instrument is actually produced and used, the design ensures that the effective volume of the container is accurately designed and calculated, and details related to the manufacturing size need to be designed and checked, and the design is as follows:
total volume of cup body: vt＝πd2h/4(mm3)
Volume of the spherical cap: vq＝π(3r-h1)h2(mm3)
Volume of slurry overflow port: vl＝π(φd)2l/4(mm3)
Effective volume of cup body：Vy＝Vt+Vl-Vd(mm3)
Other symbols are shown in figure 2, and the units are mm.
The error of the checking precision is within +/-0.5%.
The test method of the instrument is as follows:
1. starting a numerical control machine, entering a weighing interface, and setting a weighing sensor 9 to be zero according to the number;
2. the cup after assembly is arranged on the weighing sensor 9 in a number-matching way to weigh the empty weight G0(g)；
3. Taking down the empty cup, placing the empty cup on a tabletop, unscrewing the cup cover 2, taking down the sealing cover 5 of the overflow port of the measured object, and adding cement grouting material until the overflow port 1a of the measured object overflows;
4. screwing the cup cover 2 (a small amount of bubbles and cement grouting material are discharged at the moment), covering the sealing cover 5 of the overflow port of the measured object after the overflow slurry is finished, and cleaning the overflow part;
5. placing the cup on the weighing sensor 9 with the same number, and weighing the weight G1(g) The weight of the cement grouting material is equal to G1-G0(g) And the density of the cement grouting material is rho ═ (G)1-G0)/1000Vy(g/cm3)；
6. Taking off the sealing cover 7 of the injection hole, filling water into the injection hole 2a until the one-way valve 8 overflows, covering the sealing cover 7 of the injection hole, and reading the total weight G2；
7. The timing is started, and the weight G is automatically read by the equipment after 3 hours324 hours automatic reading weight G4；
8. The expansion rate of the cement grouting material is automatically generated for 3 hours by the instrument and is (G)2-G3)/1000Vy100% and 24 hours expansion rate of cement grouting material (G)2-G4)/1000Vy*100％；
9. And cleaning the tester after test detection.
The instrument has the advantages that:
1. the instrument adopts an accurate constant volume design, and the volume metering precision of the cement grouting material is high;
2. the cement grouting material is limited by the peripheral wall and the bottom in the cup, when the volume is expanded and changed, the cement grouting material can only move upwards to extrude the diaphragm 3 to deform, the incompressible liquid at the upper part is discharged, and the expansion rate of the cement grouting material is detected by measuring the weight loss;
3. in the instrument, the discharged liquid is weighed by adopting the weighing sensor with the precision of 0.5 percent, so that the measurement precision is ensured, and errors caused by insufficient precision and manual reading of the measuring tool in the primary pulp expansion rate test detection method are avoided;
4. the instrument automatically acquires weight data, automatically records the weight of the device within 3 hours and 24 hours, and reduces the labor intensity of testers;
5. the upper machine of the weighing system has the functions of automatically generating a form and uploading data.
The instrument converts the expansion volume change of a measured object into the deformation of the diaphragm 3 based on the expansion transfer principle in the relatively closed container, and then converts the deformation of the diaphragm 3 into the overflow of the standard liquid, so that the expansion volume change of the measured object can be indirectly calculated through the change of the total weight and the known density of the standard liquid, and the expansion volume change of the measured object can be calculated only by measuring the change of the total weight, so the measurement is simple and the precision is high; moreover, the instrument can also measure the density of the measured object.
Meanwhile, the added sealing cover 5 for the overflow port of the measured object can effectively prevent the measured object from leaking when the measured object expands, thereby improving the measurement precision; the deformation elasticity of the diaphragm 3 is designed to be larger than the surface tension of the measured object when the measured object is not expanded and smaller than the expansion force of the measured object, so that the volume of the measured object in the cup body 1 is a preset constant volume before the measured object is expanded, and the measurement precision is further improved; by designing the diaphragm 3 to have a spherical crown shape, it is ensured that air in the cup body 1 can be completely discharged when the cup cover 2 is hermetically mounted on the cup body 1, thereby further improving the measurement accuracy.
In addition, the instrument facilitates the injection of standard liquid by arranging the liquid injection hole 2a on the top surface of the cup cover 2; the sealing cover 7 of the liquid injection hole can effectively prevent standard liquid from volatilizing, thereby improving the measurement precision; the standard liquid overflow port 2b is arranged on the side wall of the cup cover 2, so that the standard liquid can overflow conveniently; the added check valve 8 can effectively prevent standard liquid from volatilizing, thereby further improving the measurement precision; the maximum height of the liquid injection hole 2a is designed to be larger than that of the standard liquid overflow port 2b, so that air in the standard liquid overflow port 2b during test can be avoided, and the measurement precision is further improved.
Finally, the added weighing sensor 9 can realize the on-line weighing and automatic monitoring functions of the instrument without manual monitoring, thereby greatly reducing the labor intensity of the test.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides an expansion ratio test instrument, includes cup (1) and bowl cover (2) that mutually support, its characterized in that, be equipped with measured object overflow mouth (1a) on cup (1), the internal surface of bowl cover (2) be equipped with oral area matched with diaphragm (3) of cup (1), diaphragm (3) with bowl cover (2) form standard solution and hold chamber (4), be equipped with on bowl cover (2) with standard solution holds notes liquid hole (2a) of chamber (4) intercommunication, still be equipped with on bowl cover (2) with standard solution holds standard solution overflow mouth (2b) of chamber (4) intercommunication.
2. An expansion ratio test apparatus according to claim 1, wherein the overflow (1a) for the measured substance is provided in a side wall of the mouth of the cup (1).
3. An expansion ratio test instrument according to claim 2, characterized in that the overflow port (1a) of the object to be tested is externally sealed with an overflow port sealing cover (5).
4. An expansion ratio test instrument according to claim 1, characterized in that the deformation elasticity of the membrane (3) is greater than the surface tension of the object under test when it is not expanded and less than the expansion force of the object under test.
5. An expansion ratio test instrument according to claim 1, characterized in that said membrane (3) has a spherical crown shape.
6. An expansion ratio test instrument according to claim 1, characterized in that the injection hole (2a) is provided on the top surface of the cup cover (2), and a sealing cover (7) for the injection hole is sealingly mounted at the injection hole (2 a).
7. An expansion ratio test apparatus according to claim 1, wherein said standard liquid overflow port (2b) is provided in a side wall of said cap (2).
8. An expansion ratio test instrument according to claim 7, wherein a check valve (8) is hermetically connected to the standard liquid overflow port (2b), and the check valve (8) is a tiny back check valve.
9. An expansion ratio test apparatus according to claim 1, wherein the maximum height of the liquid injection hole (2a) is larger than the maximum height of the standard liquid overflow port (2 b).
10. An expansion ratio test instrument according to claim 1, characterized in that it further comprises a load cell (9), said cup (1) resting on said load cell (9).
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