A device and method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain

Abstract

The invention provides a device and method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain, including a power system, a test system, and a test trolley; the test system includes a temperature measuring cable and a fixing device for fixing the temperature measuring cable, the two ends of the temperature measuring cable pass through the temperature measuring trolley and are fixed on the fixing device through fixing pins, and the dynamic friction coefficient between the temperature measuring cable and the grain is measured by moving the test trolley; the power system includes a drive assembly and a steel wire rope, one end of the steel wire rope is wound on the drive assembly, and the drive assembly is respectively arranged at both ends of the fixing device, the steel wire rope passes through the fixing device and is fixedly connected to the test trolley, and the test trolley moves on the fixing device through the drive assembly. The device created by the invention tests the dynamic friction coefficient between the temperature measuring cable and the grain by moving the test trolley, and this structure is simple and cost-saving.

Description

Technical Field

[0001] The invention belongs to the technical field of grain silo testing, and in particular relates to a device and method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain. Background Art

[0002] In order to prevent the grain from spontaneous combustion due to heat accumulation, a temperature measuring cable is usually arranged in the grain silo to monitor the temperature of the stored grain in real time. The temperature measuring cable is suspended on the silo roof structure and buried in the stored grain. Due to the pressure of the stored grain in the silo, when the stored grain is out of the silo, the flowing stored grain will produce vertical tension on the temperature measuring cable, and the tension has a significant impact on the silo roof structure. In the calculation process of the silo roof structure design and the selection of the temperature measuring cable, the friction coefficient between the grain silo temperature measuring cable and the storage has a significant impact on the calculation result. Therefore, it is very critical to accurately measure the dynamic friction coefficient between the temperature measuring cable and the stored grain. The present invention proposes a device for testing the dynamic friction coefficient between the grain silo temperature measuring cable and the stored grain. Summary of the invention

[0003] In view of this, the present invention aims to propose a device and method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain, so as to solve the problem of measuring the dynamic friction coefficient between the temperature measuring cable and the reserves.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain, comprising a power system, a testing system, and a testing trolley;

[0006] The test system includes a temperature measuring cable and a fixing device for fixing the temperature measuring cable. Both ends of the temperature measuring cable pass through the temperature measuring trolley and are fixed to the fixing device by fixing pins. The dynamic friction coefficient between the temperature measuring cable and the grain stored in the test trolley is measured by moving the test trolley 9.

[0007] The power system includes a driving component and a steel wire rope. One end of the steel wire rope is wound around the driving component. The driving components are respectively arranged at both ends of a fixing device. The steel wire rope passes through the fixing device and is fixedly connected to the test trolley. The test trolley moves on the fixing device through the driving component.

[0008] Furthermore, the fixing device is a U-shaped structure, including a first support plate, a second support plate, and a base plate. The first support plate and the second support plate are respectively vertically fixed at both ends of the base plate. Three groups of fixing pins are symmetrically installed on the side walls of the first support plate and the second support plate. Three aperture adjustment nuts are installed on the side walls of the test trolley. Three temperature measuring cables are provided, and the three temperature measuring cables are respectively passed through the three aperture adjustment nuts and then fixed on the fixing pins.

[0009] Furthermore, two sets of tracks are provided on the bottom plate, and two sets of rollers are provided at the bottom of the test vehicle, and each set of rollers is installed on the tracks respectively.

[0010] Furthermore, the drive assembly is provided with two groups, and the two groups of drive assemblies are respectively fixed at two ends of the fixing device, and each group of the drive assembly includes a motor, a gear reduction box, and a roller. The motor shaft is connected to the driven end of the gear reduction box, and the driving end of the gear reduction box is connected to the roller.

[0011] Furthermore, the first support plate and the second support plate are symmetrically provided with first through holes respectively, the steel wire rope is provided with two sections, the two sections of the steel wire rope respectively penetrate the first support plate and the second support plate and are connected to the rollers at both ends, and the other ends of the two sections of the steel wire rope are respectively fixed on the side walls of the test trolley.

[0012] Furthermore, load sensors are symmetrically fixedly installed on both side walls of the test trolley, and two sections of steel wire ropes are fixedly connected to the load sensors.

[0013] Furthermore, the fixing pin is in the shape of a hook, and a steel wire winding portion is provided at one end of the fixing pin, and the steel wire is wound in the winding portion;

[0014] A locking ring is installed on the outer wall of the fixing pin winding portion, and the locking ring is fixed on the fixing pin through a locking bolt.

[0015] Furthermore, the locking ring includes a first locking half ring and a second locking half ring, the second locking half ring is provided with a plurality of limiting posts, the first locking half ring is provided with a second through hole corresponding to the limiting posts, and the limiting posts are installed in the second through holes.

[0016] Furthermore, a notch is provided on the side wall of the second locking ring, and the temperature measuring cable is located in the notch.

[0017] Furthermore, the outer wall of the first locking half ring includes a first thread, the outer wall of the second locking half ring is provided with a second thread corresponding to the outer wall of the first locking half ring, and the locking bolt is screwed on the outer wall of the locking ring.

[0018] A method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain comprises the following steps:

[0019] S1, testing the total friction force F1;

[0020] S2, test the friction force F2 between the wheels and the track under the loading condition of the test trolley;

[0021] S3, test the friction force F3 between the wheels and the track under the no-load condition of the test trolley;

[0022] S4, F4 test of the sum of the friction between the wheel and the track and the friction between the cable and the aperture adjustment nut under the unloaded condition of the test trolley:

[0023] S5. Calculate the friction coefficient μ between the temperature measuring cable and the stored grain through F1, F2, F3, and F4 in steps S1 to S4.

[0024] Furthermore, the test process of step S1 is as follows: three temperature measuring cables are passed through the aperture adjustment nut, and both ends of the temperature measuring cables are clamped on the cable fixing device through bolt anchoring ring hooks; the stored grain to be tested is loaded in the trolley, the height of the stored grain should submerge the cable by 0.1m, and the counterweight is placed on the stored grain; the test motor is started; after the trolley runs smoothly, the load display value is recorded; the trolley is reset; and the test is repeated three times.

[0025] Furthermore, the loading condition in step S2 refers to loading the tested stored grain in the test trolley, the stored grain height should submerge the cable by 0.1m, and placing the counterweight on the stored grain;

[0026] The empty-load condition of the test trolley in step S3 and step S4 refers to the test trolley being empty;

[0027] The test steps of steps S2 , S3 , and S4 are based on the test step in step S1 .

[0028] Furthermore, the calculation formula of the friction coefficient μ between the temperature measuring cable and the stored grain in step S5 is as follows:

[0029]

[0030] P = γS + ρgH;

[0031] Where: μ is the dynamic friction coefficient between the temperature measuring cable and the stored grain;

[0032] D is the diameter of the temperature measuring cable, m;

[0033] L is the length of each temperature measuring cable under pressure, m;

[0034] P is the pressure on the surface of the temperature measuring cable, Pa;

[0035] F1, F2, F3, F4 are the force values ​​tested in steps 1 to 4, N;

[0036] γ is the gravitational density of stored grain, N / m3;

[0037] S is the depth of the temperature measuring cable covered by the grain storage, m;

[0038] ρ is the density of the counterweight, Kg / m3;

[0039] g is the acceleration due to gravity, N / kg;

[0040] H is the counterweight height, m.

[0041] Compared with the prior art, the device and method for testing the dynamic friction coefficient between the temperature measuring cable and the stored grain created by the present invention have the following advantages:

[0042] (1) The test trolley described in the present invention is driven by a driving assembly to slide on a fixing device. Since the temperature measuring cable passes through the aperture adjustment nut on the side wall of the test trolley, the aperture adjustment nut can be replaced and is suitable for temperature measuring cables of different diameters. The temperature measuring cable is partially located in the test trolley. Therefore, the stored grain to be tested is loaded into the test trolley. The stored grain does not pass through the temperature measuring cable. The friction coefficient between the temperature measuring cable and the stored grain is measured by moving the test trolley. This structure is simple and cost-saving.

[0043] (2) The side wall of the test vehicle described in the present invention is equipped with a load sensor. When the wire rope is dragged, the load sensor collects information and transmits the information to the display. The tension applied in different test steps is determined by recording the information in the display and distinguishing the results. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0045] Figure 1 A structural diagram of a device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to an embodiment of the present invention;

[0046] Figure 2 A structural diagram of the fixing pin described in the embodiment of the present invention;

[0047] Figure 3 A diagram of the locking structure of the fixing pin and the locking ring according to an embodiment of the present invention;

[0048] Figure 4 A structural diagram of the first locking half ring described in an embodiment of the present invention;

[0049] Figure 5 This is a structural diagram of the second locking half ring described in an embodiment of the present invention.

[0050] Description of reference numerals:

[0051] 1. Fixing device; 2. Temperature measuring cable; 3. Steel wire rope; 4. Load sensor; 5. Fixing pin; 6. Motor; 7. Gear reducer; 8. Roller; 9. Test trolley; 11. First through hole; 12. Track; 91. Load indicator; 92. Aperture adjustment nut; 51. Steel wire winding part; 52. Locking ring; 53. Locking bolt; 521. First locking half ring; 522. First thread; 523. Second through hole; 524. Second locking half ring; 525. Notch; 526. Limit column; 527. Second thread. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0054] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0055] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0056] like Figures 1 to 5 As shown, a device for testing the dynamic friction coefficient between a temperature measuring cable 2 and stored grain includes a power system, a testing system, and a testing trolley 9;

[0057] The test system includes a temperature measuring cable 2 and a fixing device 1 for fixing the temperature measuring cable 2. Both ends of the temperature measuring cable 2 pass through the temperature measuring trolley and are fixed to the fixing device 1 through fixing pins 5. The dynamic friction coefficient between the temperature measuring cable 2 and the grain stored in the test trolley 9 is measured by moving the test trolley 9.

[0058] The power system includes a driving component and a steel wire rope 3. One end of the steel wire rope 3 is wound around the driving component. The driving components are respectively arranged at both ends of the fixing device 1. The steel wire rope 3 passes through the fixing device 1 and is fixedly connected to the test trolley 9. The test trolley 9 moves on the fixing device 1 through the driving component.

[0059] like Figure 1 As shown, the fixing device 1 is a U-shaped structure, including a first support plate, a second support plate, and a bottom plate. The first support plate and the second support plate are respectively vertically fixed at both ends of the bottom plate. Three groups of fixing pins 5 are symmetrically installed on the side walls of the first support plate and the second support plate. Three aperture adjustment nuts 92 are installed on the side walls of the test trolley 9. Three temperature measuring cables 2 are provided. The three temperature measuring cables 2 are respectively passed through the three aperture adjustment nuts 92 and then fixed on the fixing pins 5.

[0060] like Figure 1 As shown, two groups of tracks 12 are provided on the bottom plate, and two groups of rollers are provided at the bottom of the test trolley 9 , and each group of rollers is installed on the tracks 12 respectively.

[0061] like Figure 1 As shown, the test trolley 9 is driven by a driving assembly to slide on the fixing device 1. Since the temperature measuring cable 2 passes through the aperture adjustment nut 92 on the side wall of the test trolley 9, the aperture adjustment nut 92 can be replaced and is suitable for temperature measuring cables 2 of different diameters. The temperature measuring cable 2 is partially located in the test trolley 9. Therefore, the stored grain to be tested is loaded into the test trolley 9, and the stored grain does not pass through the temperature measuring cable 2. Through the movement of the test trolley 9, the temperature measuring cable 2 tests the temperature of the stored grain.

[0062] like Figure 1 As shown, the drive assembly is provided with two groups, and the two groups of drive assemblies are respectively fixed at two ends of the fixing device 1, and each group of the drive assembly includes a motor 6, a gear reduction box 7, and a roller 8. The rotating shaft of the motor 6 is connected to the driven end of the gear reduction box 7, and the driving end of the gear reduction box 7 is connected to the roller 8.

[0063] like Figure 1 As shown, the first support plate and the second support plate are symmetrically provided with first through holes 11, and the steel wire rope 3 is provided with two sections. The two sections of the steel wire rope 3 respectively penetrate the first support plate and the second support plate and are connected to the rollers 8 at both ends, and the other ends of the two sections of the steel wire rope 3 are respectively fixed on the side walls of the test trolley 9.

[0064] like Figure 1 As shown, load sensors 4 are symmetrically fixedly installed on both side walls of the test trolley 9 , and two sections of steel wire ropes 3 are fixedly connected to the load sensors 4 .

[0065] like Figure 1 As shown, a load sensor 4 is installed on the side wall of the test trolley 9. When the wire rope 3 is dragged, the load sensor 4 collects information and transmits the information to the load display;

[0066] The model of load sensor 4 is FC-L70.

[0067] By starting the motor 6 to rotate, the motor 6 drives the gear reducer 7 to rotate, and the rotation of the reducer drives the drum 8 to rotate. The rollers at both ends of the fixing device 1 run relative to each other. When one of them rolls up the wire rope 3, the other one loosens it. Through the circular motion, the movement of the test trolley 9 is achieved.

[0068] like Figures 2 to 5 As shown, the fixing pin 5 is in a hook shape, and a steel wire winding portion 51 is provided at one end of the fixing pin 5, and the steel wire is wound in the winding portion.

[0069] A locking ring 52 is installed on the outer wall of the winding portion of the fixing pin 5 , and the locking ring 52 is fixed to the fixing pin 5 by a locking bolt 53 .

[0070] The locking ring 52 includes a first locking half ring 521 and a second locking half ring 524 . The second locking half ring 524 is provided with a plurality of limiting posts 526 . The first locking half ring 521 is provided with second through holes 523 corresponding to the limiting posts 526 . The limiting posts 526 are installed in the second through holes 523 .

[0071] A notch 525 is formed on the side wall of the second locking ring 52 , and the temperature measuring cable 2 is located in the notch 525 .

[0072] The outer wall of the first locking half ring 521 includes a first thread 522 , the outer wall of the second locking half ring 524 is provided with a second bolt corresponding to the outer wall of the first locking half ring 521 , and the locking bolt 53 is screwed on the outer wall of the locking ring 52 .

[0073] The temperature measuring cable 2 is wound around the winding part of the fixing pin 5, and the temperature measuring cable 2 is locked by the locking ring 52. Since the first locking ring 52 and the second locking half ring 524 are connected by the limit column 526, the distance between the first locking ring 52 and the second locking ring 52 can be realized, thereby adapting to the installation of temperature measuring cables 2 of different diameters. During installation, the slot 525 can be inserted into the temperature measuring cable 2, and then locked by the locking bolt 53. The locking bolt 53 can be replaced with different sizes according to the diameter of the temperature measuring cable 2. The replacement diameter of the temperature measuring cable 2 will not differ too much, so the locking ring 52 is able to fully lock the temperature measuring cable 2.

[0074] A display is installed on the side wall of the test trolley 9, and the load sensor 4 and the temperature measuring cable 2 are electrically connected to the display respectively. The specific connection method adopts the existing technology and will not be described in detail here.

[0075] A method for testing the dynamic friction coefficient between a temperature measuring cable 2 and stored grain, characterized by comprising the following steps:

[0076] S1, testing the total friction force F1;

[0077] S2, testing the friction force F2 between the wheels and the track 12 under the loading condition of the test trolley 9;

[0078] S3, testing the friction force F3 between the wheels and the rail 12 of the test trolley 9 under no-load condition;

[0079] S4. Test the sum of the friction between the wheel and the track 12 and the friction between the cable and the aperture adjustment nut 92 under the unloaded condition of the test trolley 9 F4:

[0080] S5. Calculate the friction coefficient μ between the temperature measuring cable 2 and the stored grain through F1, F2, F3, and F4 in steps S1 to S4:

[0081] The test process of step S1 is as follows: three temperature measuring cables 2 are passed through the aperture adjustment nut 92, and both ends of the temperature measuring cables 2 are clamped on the cable fixing device 1 through bolt anchoring ring hooks; the stored grain to be tested is loaded in the trolley, the height of the stored grain should submerge the cable by 0.1m, and the counterweight is placed on the stored grain; the test motor is started; after the trolley runs smoothly, the load display value is recorded; the trolley is reset; and the test is repeated three times.

[0082] The loading condition in step S2 refers to loading the tested stored grain in the test trolley 9, the stored grain height should submerge the cable by 0.1 m, and placing a counterweight on the stored grain.

[0083] The empty condition of the test trolley 9 in step S3 and step S4 refers to that the test trolley 9 is empty.

[0084] The test steps of steps S2 , S3 , and S4 are based on the test step in step S1 .

[0085] The calculation formula of the friction coefficient μ between the temperature measuring cable 2 and the stored grain in step S5 is as follows:

[0086]

[0087] P=γS+ρgH

[0088] Where: μ is the dynamic friction coefficient between the temperature measuring cable 2 and the stored grain;

[0089] D is the diameter of temperature measuring cable 2, m;

[0090] L is the length of each temperature measuring cable 2 under pressure, m;

[0091] P is the pressure on the surface of the temperature measuring cable 2, Pa;

[0092] F1, F2, F3, F4 are the force values ​​tested in steps 1 to 4, N;

[0093] γ is the gravitational density of stored grain, N / m3;

[0094] S is the depth of the grain storage covering the temperature measuring cable 2, m;

[0095] ρ is the weight density, Kg / m3;

[0096] g is the acceleration due to gravity, N / kg;

[0097] H is the height of the counterweight, m;

[0098] The specific test steps are as follows:

[0099] Step 1: Total friction force (F1) test: pass three temperature measuring cables 2 through the aperture adjustment nut 92, and clamp both ends of the temperature measuring cables 2 on the cable fixing device 1 through bolt anchoring ring hooks; load the tested stored grain in the trolley, the height of the stored grain should submerge the cable 0.1m, and place the counterweight on the stored grain; start the test motor; after the trolley runs smoothly, record the load display value; reset the trolley; repeat the test three times.

[0100] Step 2: Test of the friction force (F2) between the wheel and the track 12 under loading conditions: Load the stored grain to be tested in the trolley, the height of the stored grain is the same as in step 1, and place the counterweight on the stored grain (this step does not involve the temperature measuring cable 2); start the test motor; after the trolley runs smoothly, record the load display value; reset the trolley; repeat the test three times.

[0101] Step 3: Test of the friction force (F3) between the wheel and the rail 12 under no-load conditions: the trolley is unloaded (this step does not involve the temperature measuring cable 2); start the test motor; after the trolley runs smoothly, record the load display value; reset the trolley; repeat the test three times.

[0102] Step 4: Test the sum of the friction between the wheel and the rail 12 and the friction between the cable and the aperture adjustment nut 92 (F4) under no-load conditions: Pass the three test cables through the aperture adjuster, and clamp both ends of the temperature measuring cable 2 on the cable fixing device 1 (this step does not require loading of stored grain and counterweight); start the test motor; after the trolley runs smoothly, record the load display value; reset the trolley; repeat the test three times.

[0103] Step 5: Calculation of the friction coefficient (μ) between the temperature measuring cable 2 and the stored grain:

[0104]

[0105] P = γS + ρgH;

[0106] Where: μ is the dynamic friction coefficient between the temperature measuring cable 2 and the stored grain;

[0107] D is the diameter of temperature measuring cable 2, m;

[0108] L is the length of each temperature measuring cable 2 under pressure, m;

[0109] P is the pressure on the surface of the temperature measuring cable 2, Pa;

[0110] F1, F2, F3, F4 are the force values ​​tested in steps 1 to 4, N;

[0111] γ is the gravitational density of stored grain, N / m3;

[0112] S is the depth of the grain storage covering the temperature measuring cable 2, m;

[0113] ρ is the weight density, Kg / m3;

[0114] g is the acceleration due to gravity, N / kg;

[0115] H is the counterweight height, m.

[0116] The following are the parameters of each part:

[0117] Table 1 Parameters of each component

[0118] Serial number part Performance parameters 1 Electric Motor Speed: 750 rpm, Power: 200 kW 2 Gearbox Reduction ratio: 1:200 3 roller Diameter: 0.5m, length 20m 4 Wire Rope Diameter: 5mm 5 Load Cells Test range: 0-10KN 6 Car Length: 1m, Width: 1m, Height: 1.5m 7 track Length: 15m 8 Aperture adjustment nut (5 sets) Inner diameter: 0mm, 20.5mm, 25.5mm, 27.5mm, 30.5mm 9 Counterweight Material: Lead block Length: 0.96m, Width: 0.96m, Height 1m

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain, characterized in that: Including a power system, a test system, and a test vehicle (9); The test system comprises a temperature measuring cable (2) and a fixing device (1) for fixing the temperature measuring cable (2); both ends of the temperature measuring cable (2) pass through the temperature measuring trolley and are fixed to the fixing device (1) via fixing pins (5); and the dynamic friction coefficient between the temperature measuring cable (2) and the grain stored in the test trolley (9) is measured by moving the test trolley (9); The power system comprises a driving assembly and a steel wire rope (3), one end of the steel wire rope (3) is wound around the driving assembly, the driving assembly is respectively arranged at two ends of the fixing device (1), the steel wire rope (3) passes through the fixing device (1) and is fixedly connected to the test trolley (9), and the test trolley (9) moves on the fixing device (1) through the driving assembly; The fixing device (1) is a U-shaped structure, comprising a first support plate, a second support plate, and a bottom plate, wherein the first support plate and the second support plate are respectively vertically fixed at two ends of the bottom plate, three groups of fixing pins (5) are symmetrically installed on the side walls of the first support plate and the second support plate, three aperture adjustment nuts (92) are installed on the side wall of the test trolley (9), and three temperature measuring cables (2) are provided, and the three temperature measuring cables (2) are respectively passed through the three aperture adjustment nuts (92) and then fixed on the fixing pins (5); The bottom plate is provided with two sets of tracks (12), and the bottom of the test trolley (9) is provided with two sets of rollers, each set of rollers is respectively installed on the tracks (12); The fixing pin (5) is in the shape of a hook, and a wire winding portion (51) is provided at one end of the fixing pin (5), and the wire rope is wound in the winding portion; A locking ring (52) is installed on the outer wall of the winding portion of the fixing pin (5), and the locking ring (52) is fixed to the fixing pin (5) by a locking bolt (53); The locking ring (52) comprises a first locking half ring (521) and a second locking half ring (524); the second locking half ring (524) is provided with a plurality of limiting posts (526); the first locking half ring (521) is provided with second through holes (523) corresponding to the limiting posts (526); the limiting posts (526) are installed in the second through holes (523); A notch (525) is provided on the side wall of the second locking half ring (524), and the temperature measuring cable (2) is located in the notch (525).

2. A device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to claim 1, characterized in that: The drive assembly is provided with two groups, and the two groups of drive assemblies are respectively fixed at two ends of the fixing device (1), and each group of the drive assembly comprises a motor (6), a gear reduction box (7), and a roller (8), the rotating shaft of the motor (6) is connected to the driven end of the gear reduction box (7), and the driving end of the gear reduction box (7) is connected to the roller (8); The first support plate and the second support plate are symmetrically provided with first through holes (11), the steel wire rope (3) is provided with two sections, the two sections of the steel wire rope (3) respectively penetrate the first support plate and the second support plate and are connected to rollers (8) at both ends, and the other ends of the two sections of the steel wire rope (3) are respectively fixed on the side walls of the test trolley (9).

3. A device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to claim 2, characterized in that: Load sensors (4) are symmetrically fixedly installed on both side walls of the test trolley (9), and two sections of steel wire ropes (3) are fixedly connected to the load sensors (4).

4. A device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to claim 3, characterized in that: The outer wall of the first locking half ring (521) includes a first thread (522), the outer wall of the second locking half ring (524) is provided with a second thread (527) corresponding to the outer wall of the first locking half ring (521), and the locking bolt (53) is screwed on the outer wall of the locking ring (52).

5. A method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain, according to a device for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to any one of claims 1 to 4, characterized in that The following steps are involved: S1, testing the total friction force F1; S2, test the friction force F2 between the wheels and the track under the loading condition of the test trolley; S3, test the friction force F3 between the wheels and the track under the no-load condition of the test trolley; S4, F4 test of the sum of the friction between the wheel and the track and the friction between the cable and the aperture adjustment nut under the unloaded condition of the test trolley: S5. Calculate the friction coefficient μ between the temperature measuring cable and the stored grain through F1, F2, F3, and F4 in steps S1 to S4.

6. A method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to claim 5, characterized in that: The test process of step S1 is as follows: pass three temperature measuring cables through the aperture adjustment nut, and clamp the two ends of the temperature measuring cables on the cable fixing device through bolt anchoring ring hooks; load the tested stored grain in the trolley, the height of the stored grain should submerge the cable by 0.1m, and place the counterweight on the stored grain; start the test motor; after the trolley runs smoothly, record the load display value; reset the trolley; repeat the test three times.

7. A method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to claim 5, characterized in that: The loading condition in step S2 refers to loading the tested stored grain in the test trolley, the stored grain height should submerge the cable by 0.1m, and placing the counterweight on the stored grain; The empty-load condition of the test trolley in step S3 and step S4 refers to the test trolley being empty; The test steps of steps S2 , S3 , and S4 are based on the test step in step S1 .

8. A method for testing the dynamic friction coefficient between a temperature measuring cable and stored grain according to claim 5, characterized in that: The calculation formula of the friction coefficient μ between the temperature measuring cable and the stored grain in step S5 is as follows: ； P = γS + ρgH; Where: μ is the dynamic friction coefficient between the temperature measuring cable and the stored grain; D is the diameter of the temperature measuring cable, m; L is the length of each temperature measuring cable under pressure, m; P is the pressure on the surface of the temperature measuring cable, Pa; F1, F2, F3, F4 are the force values ​​tested in steps 1 to 4, N; γ is the gravity density of stored grain, N / m 3 ; S is the depth of the temperature measuring cable covered by the grain storage, m; ρ is the weight density, Kg / m 3 ; g is the acceleration due to gravity, N / kg; H is the counterweight height, m.

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