Stacked grain bag friction coefficient measurement test device

Abstract

The invention relates to a stacked grain bag friction coefficient measurement test device which comprises a device support, at least two grain bags are placed on the device support, the grain bag at the lowest position is a bottom grain bag, the grain bag on the upper side of the bottom grain bag is a pushed grain bag, a first film pressure sensor is arranged between the pushed grain bag and the bottom grain bag, and a second film pressure sensor is arranged between the pushed grain bag and the bottom grain bag. The upper side of the first film pressure sensor is an upper side grain layer, a first grain balancing grid is arranged between the lower side of the first film pressure sensor and the bottom grain bag, the first grain balancing grid is composed of a plurality of grid strips which are arranged in a transverse and longitudinal crossing mode, the first grain balancing grid is provided with a plurality of first grid holes, and each first grid hole only contains one bulk grain particle. The upper ends of the bulk grain particles upwards protrude out of the grain uniformizing grid and make contact with the first film pressure sensor, and the lower ends of the bulk grain particles downwards protrude out of the first grain uniformizing grid and make contact with the side wall of the bottom of the pushed grain bag. The invention provides the stacked grain bag friction coefficient measuring and testing device which can be used for measuring and testing the friction coefficient between grain bags in the vertical direction.

Description

Technical Field

[0001] The invention relates to the technical field of friction coefficient measurement, in particular to a friction coefficient measurement test device for stacked grain bags. Background Art

[0002] When grain is stored in a warehouse, the usual practice is to pack the bulk grain into bags, which are then stored in the warehouse in stacks.

[0003] Grain bags are stacked in the form of "a finished grain stacking system" disclosed in Chinese patent CN116946603A, where multiple grain bags are stored on corresponding pallets in a stacked form. However, during the storage of grain bags, it is found that if the grain bags are skewed during the stacking process, a safety accident of the grain bags sliding down is likely to occur. To address this problem, one solution is to try to ensure that the grain bags will not be skewed during the stacking process, and another solution is to study the friction coefficient between grain bags during the stacking process, and reduce the relative sliding problem between grain bags by studying the relationship between the posture of the grain bags and the friction coefficient. Summary of the invention

[0004] The object of the present invention is to provide a friction coefficient measuring and testing device for stacked grain bags, which can measure and test the friction coefficient between grain bags in the up and down directions.

[0005] In order to solve the above technical problems, the technical solution of a friction coefficient measurement test device for stacked grain bags in the present invention is as follows: A friction coefficient measurement test device for stacked grain bags comprises a device support, on which at least two grain bags stacked in sequence in an up-and-down direction are placed, wherein the grain bag at the bottom is a bottom grain bag, and a grain bag on the upper side of the bottom grain bag is a pushed grain bag, the device support is provided with a bottom grain bag stopping structure for limiting the bottom grain bag from moving rightward, the device support is provided with a force applying mechanism for applying a force in a rightward direction to the pushed grain bag, a force sensor is provided on the force transmission path between the force applying mechanism and the pushed grain bag, and the pushed grain bag and the bottom grain bag are connected to each other. A first film pressure sensor is arranged between the upper grain layer and the lower grain bag, and a first grain balancing grid is arranged between the lower side of the first film pressure sensor and the bottom grain bag. The first grain balancing grid is composed of a plurality of grid bars arranged crosswise in the horizontal and vertical directions. The first grain balancing grid has a plurality of first grid holes, and each first grid hole can only accommodate one loose grain particle. The upper end of the loose grain particle protrudes above the grain balancing grid and contacts with the first film pressure sensor, and the lower end of the loose grain particle protrudes below the first grain balancing grid and contacts with the bottom side wall of the pushed grain bag.

[0006] Furthermore, the piled grain bag includes a closed middle grain bag and a lower grain bag with an open upper side, the middle grain bag is filled with loose grain particles, the lower grain bag is connected to the bottom of the middle grain bag through a lower zipper, the upper grain layer, the first film pressure sensor, the first grain equalizing grid and the loose grain particles in the first grain equalizing grid are arranged in the lower grain bag, and the bottom of the loose grain particles in the first grain equalizing grid is in contact with the bottom side wall of the lower grain bag.

[0007] Furthermore, the grain bag also includes a top grain bag arranged on the upper side of the pushed grain bag, the circumferential side wall of the middle grain bag protrudes above the top side wall of the middle grain bag to form an upper grain loading trough, the top of the upper grain loading trough is connected to a grain bag surface whose upper end contacts the top grain bag through an upper zipper, the upper grain loading trough is filled with a lower grain layer, a second film pressure sensor is arranged on the upper side of the lower grain layer in the upper grain loading trough, a second grain equalization grid is arranged between the second film pressure sensor and the grain bag surface, the second grain equalization grid has a plurality of second grid holes, each second grid hole can only accommodate one loose grain particle, the upper end of the loose grain particle protrudes above the second grain equalization grid and contacts the grain bag surface, and the lower end of the loose grain particle protrudes below the second grain equalization grid and contacts the second film pressure sensor.

[0008] Furthermore, a top grain bag stopping structure for limiting the top grain bag from moving rightward is provided on the device bracket.

[0009] Furthermore, a limiting plate is fixed on the right side of the top grain bag, the middle grain bag and the bottom grain bag on the device bracket, and an avoidance hole corresponding to the height of the middle grain bag is opened on the limiting plate. The force-applying mechanism applies a thrust to the left end of the middle grain bag through the force transmission structure, and the force transmission structure passes through the avoidance hole. The top grain bag stopping structure is composed of the left side plate surface of the limiting plate on the upper side of the avoidance hole, and the bottom grain bag stopping structure is composed of the left side plate surface of the limiting plate on the lower side of the avoidance hole.

[0010] Furthermore, the force transmission structure includes a front pull rope and a rear pull rope located on the front and rear sides of the middle grain bag, and the left ends of the front pull rope and the rear pull rope are connected to a force pushing plate that cooperates with the left end of the middle grain bag.

[0011] Furthermore, a pull-wire displacement sensor is arranged on the device bracket on the left side of the middle grain bag, and the pull wire of the pull-wire displacement sensor is connected to the force-applying push plate.

[0012] The beneficial effects of the present invention are as follows: when the present invention is in use, the force-applying mechanism applies a force F in the right direction to the pushed grain bag, and the thin film pressure sensor measures the vertical positive pressure N generated between the pushed grain bag and the bottom grain bag. According to the formula F=μN, the friction coefficient μ between the pushed grain bag and the bottom grain bag can be calculated. However, while the thin film pressure sensor is used to accurately obtain the vertical positive pressure N, it also brings new problems, that is, the surface of the thin film pressure sensor is relatively smooth. If the thin film pressure sensor is used to directly act between the two grain bags, this will inevitably lead to the direct contact between the two grain bags being different from the contact between the two grain bags in the actual stacking process. Therefore, in the present invention, loose grain particles need to be arranged between the first thin film pressure sensor and the bottom grain bag to simulate the contact in the actual stacking process. The contact working condition of two adjacent grain bags, but new problems arise, that is, the loose grain particles between the first film pressure sensor and the bottom grain bag cannot be too many, and they must be evenly distributed. If there are too many, these loose grain particles will bring a large measurement error to the vertical positive pressure, and if there are too few, they cannot be fully evenly distributed between the first film pressure sensor and the bottom grain bag. Therefore, in the present invention, a first grain equalization grid is arranged between the first film pressure sensor and the bottom grain bag, and each first grid hole of the first grain equalization grid can only accommodate one loose grain particle. That is to say, the grain layer between the first film pressure sensor and the bottom grain bag is composed of a single layer of loose grain particles, that is, there will be no large weight to cause a large deviation in the vertical positive pressure, and it also ensures that the loose grain particles are evenly distributed between the first film pressure sensor and the bottom grain bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 2 yes Figure 1 Structural diagram of the middle limit plate; Figure 3 yes Figure 1 Structural schematic diagram of the central force transmission structure; Figure 4 is a schematic diagram of the coordination of the top grain bag, the middle grain bag and the bottom grain bag in Example 1; Figure 5 yes Figure 4 A in the enlarged view; Figure 6 yes Figure 4 The enlarged view of point B in the figure; Figure 7 yes Figure 4 A partial top view of the first grain-equalizing grid in the middle; 1. Pull-wire displacement sensor; 2. Pull-wire of pull-wire displacement sensor; 3. Force-applying push plate; 4. Pushed grain bag; 5. Top grain bag; 6. Counterweight block; 7. Limit plate; 8. Avoidance hole; 9. Force sensor; 10. Force-applying mechanism; 11. Front pull rope; 12. Bottom grain bag; 13. Device bracket; 14. Bottom grain bag stop structure; 15. Top grain bag stop structure; 16. Steel cable support rod; 17. Rear pull rope; 19. Grain bag surface ; 20. Lower grain layer; 21. Middle grain bag; 22. Upper grain layer; 23. Lower grain bag; 24. Lower zipper; 25. First film pressure sensor; 26. First grain balance grid; 27. Bulk grain particles; 28. First grid hole; 29. ​​Bottom side wall of lower grain bag; 30. Upper zipper; 31. Grain bag surface; 32. Second grain balance grid; 33. Upper grain loading trough; 34. Second film pressure sensor; 35. Grid bars. DETAILED DESCRIPTION

[0014] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0015] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0016] An embodiment of a friction coefficient measurement test device for stacked grain bags of the present invention is as follows: Figures 1 to 7 As shown, it includes a device support 13, on which three grain bags are stacked in sequence in the up-down direction, wherein the middle grain bag is a pushed grain bag 4, the grain bag below the pushed grain bag is a bottom grain bag 12 whose bottom contacts the device support, and the grain bag above the pushed grain bag is a top grain bag 5. A plurality of counterweights 6 are arranged on the upper side of the top grain bag 5.

[0017] The device bracket is provided with a bottom grain bag stopping structure 14 for limiting the bottom grain bag from moving to the right and a top grain bag stopping structure 15 for limiting the top grain bag from moving to the right. The device bracket is provided with a force-applying mechanism 10 for applying a force in the right direction to the pushed grain bag. The force-applying mechanism 10 is located on the right side of the pushed grain bag. A force sensor 9 is provided on the force transmission path between the force-applying mechanism and the pushed grain bag. In this embodiment, the force-applying mechanism 10 is a horizontally arranged tension cylinder (or an electric chain tensioning machine) that can be tensioned horizontally at a uniform speed. The force-applying mechanism applies a thrust to the left end of the middle grain bag through the force transmission structure, and the force sensor is provided between the force transmission structure and the force-applying mechanism.

[0018] The force transmission structure includes a front pull rope 11 and a rear pull rope 17 located at the front and rear sides of the middle grain bag. The front pull rope and the rear pull rope both include an upper steel cable and a lower steel cable spaced apart from each other. The left ends of the front pull rope and the rear pull rope are connected to a force push plate 3 that is abutted against the left end of the middle grain bag. Specifically, the left end of the upper steel cable is connected to the upper end of the force push plate 3, and the left end of the lower steel cable is connected to the lower end of the force push plate. The right ends of the front pull rope and the rear pull rope are connected to the two ends of a horizontally arranged steel cable support rod 16, and the steel cable support rod 16 is connected to the left end of the force sensor 9.

[0019] A limiting plate 7 is fixed on the device bracket to the right side of the top grain bag 5, the pushed grain bag 4 and the bottom grain bag 12, and an avoidance hole 8 corresponding to the height of the middle grain bag is opened on the limiting plate. The force transmission structure passes through the avoidance hole. The top grain bag stopping structure is composed of the left side plate surface of the limiting plate on the upper side of the avoidance hole, and the bottom grain bag stopping structure is composed of the left side plate surface of the limiting plate on the lower side of the avoidance hole.

[0020] A first film pressure sensor 25 is arranged between the pushed grain bag and the bottom grain bag, and the upper side of the first film pressure sensor 25 is the upper grain layer 22, and a first grain equalization grid 26 is arranged between the lower side of the first film pressure sensor and the bottom grain bag. The first grain equalization grid 26 is composed of a plurality of grid bars 35 arranged crosswise in the horizontal and vertical directions, and the first grain equalization grid has a plurality of first grid holes 28, and each first grid hole 28 can only accommodate one loose grain particle 27, and the upper end of the loose grain particle protrudes above the grain equalization grid and contacts with the first film pressure sensor, and the lower end of the loose grain particle protrudes below the first grain equalization grid and contacts with the bottom side wall of the pushed grain bag.

[0021] The piled grain bag includes a closed middle grain bag 21 and a lower grain bag 23 with an open upper side. The middle grain bag 21 is filled with loose grain particles. The lower grain bag 23 is connected to the bottom of the middle grain bag through a lower zipper 24. The upper grain layer, the first film pressure sensor, the first grain-equalizing grid, and the loose grain particles in the first grain-equalizing grid are arranged in the lower grain bag 23. The bottom of the loose grain particles in the first grain-equalizing grid contacts the bottom side wall 29 of the lower grain bag, and the bottom side wall of the lower grain bag constitutes the bottom side wall of the pushed grain bag. The bottom of the bottom side wall of the lower grain bag contacts and cooperates with the upper end of the bottom grain bag. When in use, the lower grain bag and the middle grain bag can be disassembled by the lower zipper, so as to facilitate the arrangement of the first film pressure sensor, the upper grain layer, and the first grain-equalizing grid.

[0022] The circumferential side wall of the middle grain bag 21 is convex to the top side wall of the middle grain bag to form an upper grain loading groove 33. The top of the upper grain loading groove 33 is connected to a grain bag surface 31 whose upper end contacts the top grain bag through an upper zipper 30. The grain bag surface constitutes the top side wall of the pushed grain bag. The lower grain layer 20 is filled in the upper grain loading groove 33. A second film pressure sensor 34 is arranged on the upper side of the lower grain layer in the upper grain loading groove. A second grain equalization grid 32 is arranged between the second film pressure sensor 34 and the grain bag surface 31. The second grain equalization grid 32 has a plurality of second grid holes. Each second grid hole only accommodates one loose grain particle. The upper end of the loose grain particle is convex to the second grain equalization grid and contacts the grain bag surface. The lower end of the loose grain particle is convex to the second grain equalization grid and contacts the second film pressure sensor. When in use, the grain bag surface and the upper grain loading groove can be disassembled by the upper zipper, so as to facilitate the installation of the second film pressure sensor, the lower grain layer and the second grain equalization grid.

[0023] A pull-wire displacement sensor 1 is arranged on the device bracket at the left side of the middle grain bag, and a pull wire 2 of the pull-wire displacement sensor is connected to a force-applying push plate 3 .

[0024] When in use, the force-applying mechanism applies a force in the right direction to the left end of the pushed grain bag through the force-applying push plate, and the force sensor detects the force in real time. The wire displacement sensor is used to detect the displacement of the force-applying push plate. When the force-applying push plate brings the pushed grain bag to have a relative displacement relative to the bottom grain bag and the top grain bag, the force sensor reading and the corresponding film pressure sensor reading at that moment are recorded. The setting of the first grain-equalizing grid and the second grain-equalizing grid also makes the contact between the pushed grain bag and the bottom grain bag and the top grain bag basically consistent. Therefore, it can be considered that the horizontal force between the pushed grain bag and the bottom grain bag and the top grain bag is half of the force sensor reading. Then, according to the reading of the corresponding film pressure sensor, the friction coefficient of the corresponding position can be calculated. The stacking form between the grain bags is changed, such as arranging the grain bags in parallel, arranging them in a horizontal and vertical staggered manner, etc., to test the influence of different stacking forms on the friction coefficient. In other embodiments of the present invention, the top grain bag may not be provided.

[0025] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0026] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0027] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test device for measuring the friction coefficient of stacked grain bags, characterized in that: The device comprises a support, on which at least two grain bags stacked in sequence in an up-and-down direction are placed, wherein the grain bag at the bottom is a bottom grain bag, and a grain bag on the upper side of the bottom grain bag is a pushed grain bag, a bottom grain bag stopping structure for limiting the bottom grain bag from moving rightward is arranged on the support, a force-applying mechanism for applying a force in a rightward direction to the pushed grain bag is arranged on the support, a force sensor is arranged on a force transmission path between the force-applying mechanism and the pushed grain bag, a first film pressure sensor is arranged between the pushed grain bag and the bottom grain bag, the upper side of the first film pressure sensor is an upper grain layer, a first grain-equalizing grid is arranged between the lower side of the first film pressure sensor and the bottom grain bag, the first grain-equalizing grid is composed of a plurality of grid bars arranged crosswise in a horizontal and vertical direction, the first grain-equalizing grid has a plurality of first grid holes, each of the first grid holes accommodates only one loose grain particle, the upper end of the loose grain particle protrudes above the grain-equalizing grid and contacts with the first film pressure sensor, and the lower end of the loose grain particle protrudes below the first grain-equalizing grid and contacts with the bottom side wall of the pushed grain bag.

2. The friction coefficient measuring test device for stacked grain bags according to claim 1 is characterized in that: The piled grain bag includes a closed middle grain bag and a lower grain bag with an open upper side, the middle grain bag is filled with loose grain particles, the lower grain bag is connected to the bottom of the middle grain bag through a lower zipper, the upper grain layer, the first film pressure sensor, the first grain equalizing grid and the loose grain particles in the first grain equalizing grid are arranged in the lower grain bag, and the bottom of the loose grain particles in the first grain equalizing grid is in contact with the bottom side wall of the lower grain bag.

3. The friction coefficient measuring test device for stacked grain bags according to claim 2 is characterized in that: The grain bag also includes a top grain bag arranged on the upper side of the pushed grain bag, the circumferential side wall of the middle grain bag protrudes above the top side wall of the middle grain bag to form an upper grain loading groove, the top of the upper grain loading groove is connected to a grain bag surface whose upper end contacts the top grain bag through an upper zipper, the upper grain loading groove is filled with a lower grain layer, a second film pressure sensor is arranged on the upper side of the lower grain layer in the upper grain loading groove, a second grain equalizing grid is arranged between the second film pressure sensor and the grain bag surface, the second grain equalizing grid has a plurality of second grid holes, each second grid hole can only accommodate one loose grain particle, the upper end of the loose grain particle protrudes above the second grain equalizing grid and contacts the grain bag surface, and the lower end of the loose grain particle protrudes below the second grain equalizing grid and contacts the second film pressure sensor.

4. The friction coefficient measuring test device for stacked grain bags according to claim 3 is characterized in that: A top grain bag stopping structure for limiting the top grain bag from moving rightward is arranged on the device bracket.

5. The friction coefficient measuring test device for stacked grain bags according to claim 4 is characterized in that: A limiting plate is fixed on the right side of the top grain bag, the middle grain bag and the bottom grain bag on the device bracket, and an avoidance hole corresponding to the height of the middle grain bag is opened on the limiting plate. The force-applying mechanism applies a thrust to the left end of the middle grain bag through the force transmission structure, and the force transmission structure passes through the avoidance hole. The top grain bag stopping structure is composed of the left side plate surface of the limiting plate on the upper side of the avoidance hole, and the bottom grain bag stopping structure is composed of the left side plate surface of the limiting plate on the lower side of the avoidance hole.

6. The friction coefficient measuring test device for stacked grain bags according to claim 5 is characterized in that: The force transmission structure comprises a front pull rope and a rear pull rope located at the front and rear sides of the middle grain bag. The left ends of the front pull rope and the rear pull rope are connected with a force pushing plate which cooperates with the left end of the middle grain bag.

7. The friction coefficient measuring test device for stacked grain bags according to claim 6 is characterized in that: A pull-wire displacement sensor is arranged on the device bracket at the left side of the middle grain bag, and the pull wire of the pull-wire displacement sensor is connected with the force-applying push plate.

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