Miniature vane calibration tool

Abstract

The utility model relates to a miniature vane calibration tool, and belongs to the technical field of geological survey. The miniature vane calibration tool comprises a mounting seat, the top of the mounting seat is provided with a mounting bracket, and the mounting bracket is used for fixing a miniature vane; the detection disc is provided with a concave structure which is matched with the miniature cross plate in an inserting manner, and the detection disc is rotationally connected with the mounting seat; the pressure sensing devices are located on the two sides of the mounting base and comprise first supports, second supports and weight trays, the first supports are arranged on the mounting base and provided with pressure sensors, the second supports are rotationally connected with the first supports through rotating shafts, the detection ends of the pressure sensors are opposite to the second supports, and the weight trays are arranged on the second supports. The weight tray is connected with a cable, and the cable is connected with the detection disc after bypassing the second support. According to the scheme provided by the utility model, the miniature vane can be fixed and accurately loaded in different scenes, the operation is simple, and the structure is novel.

Description

TECHNICAL FIELD

[0001] The utility model relates to geological survey technical field especially relates to a micro cross board calibration tool. BACKGROUND

[0002] Cross plate shear test, also known as Vane Shear Test (VST for short), is a test method for determining the shear strength of soft cohesive soil. During the test, the cross plate head is inserted into the soil layer or soil, and rotated at a constant speed to form a cylindrical failure surface. The resistance moment of the soil is measured by a measuring system, and the shear strength of the soil is calculated. As the core equipment of shear test, cross plate shear tester can be divided into field type and indoor type according to different use environments. In engineering practice, the shear strength and sensitivity of soft cohesive soil are comprehensively analyzed by combining the test results of the two types, so as to evaluate the bearing capacity of foundation soil or single pile, and calculate the slope stability or judge the stress history of soft cohesive soil.

[0003] At present, the micro cross plate shear device still lacks accurate calibration equipment, which leads to significant deviation of test data and makes it difficult to accurately reflect the real geological conditions. UTILITY MODEL CONTENT

[0004] In order to overcome the problems existing in the prior art, the utility model aims at providing a micro cross plate calibration tool, which can fix and accurately load the micro cross plate in different scenes, and is simple to operate and novel in structure.

[0005] The utility model provides a micro cross plate calibration tool, which comprises:

[0006] A mounting seat is provided with a mounting bracket at the top, and the mounting bracket is used for fixing the micro cross plate;

[0007] A detection disc is provided with a recess structure matched with the micro cross plate, and the detection disc is rotationally connected with the mounting seat;

[0008] A pressure sensing device is located on both sides of the mounting seat and comprises a first bracket, a second bracket and a weight tray, the first bracket is arranged on the mounting seat, the first bracket is provided with a pressure sensor, the second bracket is rotationally connected with the first bracket through a rotating shaft, the detection end of the pressure sensor is opposite to the second bracket, and the weight tray is connected with a cable, and the cable is connected with the detection disc after passing through the second bracket.

[0009] In some embodiments, the mounting bracket comprises a joint assembly and two oppositely arranged mounting frames, the joint assembly is located between the two mounting frames and connected with the mounting frames, the mounting frames are detachably arranged on the mounting seat, and the joint assembly has a mounting cavity matched with the micro cross plate.

[0010] In some embodiments, the joint assembly comprises an outer ring joint and an inner ring joint, the outer ring joint is connected to the mounting frame by bolts, the inner ring joint is embedded in the outer ring joint, the inner ring joint is provided with a hollow structure, and the micro cross plate is embedded in the inner ring joint.

[0011] In some embodiments, the mounting frame comprises a mounting plate and a support plate, the bottom of the mounting plate is provided with a protrusion, the mounting seat is provided with a mounting hole matched with the protrusion, the first end of the support plate extends outward to form a plug-in part, the bottom of the mounting plate is provided with a groove matched with the plug-in part, the plug-in part is provided with a threaded hole, and the bolt is threadedly connected with the mounting plate after penetrating through the threaded hole, the second end of the support plate forms a notch used for abutting the joint assembly, and the support plate is threadedly connected with the joint assembly.

[0012] In some embodiments, the detection disc comprises a disc body, a disc shaft and a rotating seat, the center of the disc body is provided with a bottom-opened accommodating cavity, the top of the disc body is provided with a through hole communicated with the accommodating cavity, the top of the disc shaft is provided with the recessed structure, the disc shaft is arranged in the accommodating cavity, and the recessed structure of the disc shaft is exposed outside the disc body through the through hole;

[0013] A first groove is arranged on the side wall of the accommodating cavity, a second groove is arranged on the outer peripheral wall of the disc shaft, and the first groove and the second groove form a limiting cavity for placing the pin shaft;

[0014] The bottom of the disc shaft is provided with a cylindrical groove, the top of the rotating seat is provided with a cylindrical boss, the cylindrical boss is inserted into the cylindrical groove, and the rotating seat is rotationally connected with the mounting seat.

[0015] In some embodiments, the top of the mounting seat is provided with a support table, the support table is provided with a bearing, the detection disc is embedded in the bearing, and the mounting bracket is plug-in matched with the support table.

[0016] In some embodiments, the first bracket comprises a connecting seat and a first hinge, the connecting seat is connected to the outer side wall of the mounting seat, the mounting seat extends outward to form a connecting plate on the side away from the mounting seat, the first hinge is arranged on the connecting plate, the pressure sensor is horizontally arranged on the side of the mounting seat away from the mounting seat, the pressure sensor is located below the connecting plate, and the second bracket is rotationally connected with the first hinge.

[0017] In some embodiments, the second support comprises a second hinge, a pulley support and a pulley, the second hinge is rotatably connected with the first hinge through a rotating shaft, the second hinge is opposite to the detection end of the pressure sensor, the pulley support is arranged on an end surface of the second hinge away from the pressure sensor, the pulley is installed on the pulley support, and the cable is connected with the detection disc after winding around the pulley.

[0018] In some embodiments, a digital display screen is further included, which is connected with the pressure sensor and used for displaying the hanging weight of the weight tray.

[0019] The technical scheme provided by the utility model can have the following beneficial effects:

[0020] When the technical scheme is applied, the end of the micro cross plate is fixed by the mounting support, and the detection end of the micro cross plate is arranged downward and embedded in the recess structure of the detection disc. Then, the standard weights with the same weight are placed on the weight tray, the weight of the standard weights is transmitted to the second support through the cable, so that the second support rotates and contacts with the pressure sensor, and the torque of the standard weights applied to the detection disc is measured. Under the above arrangement, a standard mechanical reference value is given to the sensor system in the micro cross plate, and a plurality of calibration points of the load gradient can be constructed for a micro cross plate by gradually increasing the standard weights with the same weight, and finally a mechanical response curve of the micro cross plate is formed. Through the curve, the K value of the stress response curve of the sensor in the micro cross plate can be determined, so that the sensor in the cross plate can generate consistent electrical parameters when subjected to the same external force in the field operation, and the corresponding parameters can be collected, and the parameters obtained by the micro cross plate in the field test have reliability. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the figures, and wherein:

[0022] Figure 1 is a structural schematic view of the micro cross plate calibration tool shown in the utility model embodiment;

[0023] Figure 2 is a partial structural schematic view of the micro cross plate calibration tool shown in the utility model embodiment;

[0024] Figure 3 is a structural schematic view of the mounting support shown in the utility model embodiment;

[0025] Figure 4 is an exploded schematic view of the mounting support shown in the utility model embodiment;

[0026] Figure 5 is a structural schematic diagram of a detection disc shown in an embodiment of the present application;

[0027] Figure 6 is an explosion schematic diagram of a detection disc shown in an embodiment of the present application;

[0028] Figure 7 is another explosion schematic diagram of a detection disc shown in an embodiment of the present application;

[0029] Figure 8 is a partial structure schematic diagram of a pressure sensing device shown in an embodiment of the present application.

[0030] Reference signs:

[0031] 1, mounting seat; 11, mounting support; 110, joint assembly; 1100, outer ring joint; 1101, inner ring joint; 111, mounting frame; 1110, mounting plate; 1111, support plate; 1112, protrusion; 1113, plug-in part; 12, support table; 13, bearing; 14, mounting hole;

[0032] 2, detection disc; 20, recess structure; 21, disc body; 210, containing cavity; 211, first groove; 212, pin shaft; 22, disc shaft; 220, second groove; 221, cylindrical groove; 23, rotating seat; 230, cylindrical boss;

[0033] 3, pressure sensing device; 31, first support; 310, connecting seat; 311, first hinge; 312, connecting plate; 32, second support; 320, second hinge; 321, pulley support; 322, pulley; 33, pressure sensor;

[0034] 4, micro cross plate. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0036] In the description of the application, it needs to be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end", "length", "outer end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0037] In addition, in the description of the application, "a plurality of" means at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0038] Calibration is a necessary prerequisite procedure before the factory shipment of the cross plate as an electrical measuring cross plate, which involves the cross plate with the built-in torque sensor. Through calibration, the sensor system obtains a standardized mechanical reference value, ensuring accurate collection of relevant parameters during operation. Generally, the cross plate must complete calibration before test operation.

[0039] The calibration process is essentially to give the sensor a standardized parameter. Due to the production process, it is impossible to completely avoid parameter errors, and the sensor will inevitably have a slight deviation when measuring. Specifically, even if the same force is applied to the same batch of sensors, there will be differences in the electrical parameters such as voltage and current feedback. Therefore, the calibration operation of the cross plate is to improve the reliability of the cross plate shear test results.

[0040] The technical solutions of the embodiments of the application are described in detail below with reference to the drawings.

[0041] As shown in Figures 1 to 2 The utility model discloses a micro cross plate 4 calibration tool, which comprises a mounting seat 1 provided with a mounting bracket 11 at the top, and the mounting bracket 11 is used for fixing the micro cross plate 4.

[0042] A detection disc 2 having a recess structure 20 matched with the micro cross plate 4 is rotationally connected with the mounting seat 1.

[0043] A pressure sensing device 3 is located on both sides of the mounting seat 1, which comprises a first bracket 31, a second bracket 32 and a weight tray (not shown), the first bracket 31 is arranged on the mounting seat 1, the first bracket 31 is provided with a pressure sensor 33, the second bracket 32 is rotationally connected with the first bracket 31 through a rotating shaft, the detection end of the pressure sensor 33 is opposite to the second bracket 32, the weight tray is connected with a cable (not shown), and the cable is connected with the detection disc 2 after passing through the second bracket 32.

[0044] The mounting base 1 is designed to mount the detection disc 2 and the pressure sensing device 3. The mounting base 1 can be a plate body and a frame, etc. If the plate body is selected as the bearing platform of the detection disc 2, the pressure sensing device 3 and the mounting bracket 11, a through hole is provided on the plate body to avoid the detection disc 2 and ensure the rotational connection of the detection disc 2. In order to ensure the structural strength and durability of the mounting base 1 and improve the carrying convenience of the micro-cross plate calibration tool, the mounting base 1 can be composed of an aluminum profile to form a frame, which has moderate structural strength and light weight, and is convenient for manual carrying. The cable can be a steel cable or a fiber rope. In some embodiments, in order to ensure the durability of the pressure sensing device 3, the cable is preferably a steel cable, and the diameter of the steel beam is 1-3 mm. When calibrating the micro-cross plate 4, the micro-cross plate 4 to be calibrated is loaded into the mounting bracket 11 downward, so that the detection end (for example, the detection head of the cross-shaped structure) of the micro-cross plate 4 can be embedded into the recessed structure 20 of the detection disc 2. Then, the same weight standard weights are placed on the weight trays on both sides of the mounting base 1, the weight of the standard weights is transmitted to the second bracket 32 through the cable, the second bracket 32 is rotated under stress and contacts the pressure sensor 33, so as to obtain the torque of the standard weights applied to the detection disc 2. Under this setting, a standard mechanical reference value can be given to the sensor system inside the micro-cross plate 4, and by gradually increasing the same weight standard weights, a load gradient can be formed to determine multiple calibration points of the micro-cross plate 4, and finally a mechanical response curve is drawn. Through this curve, the K value of the stress response curve of the sensor inside the micro-cross plate 4 can be determined.

[0045] In this embodiment, the micro-cross plate calibration tool simulates the cross plate shear test by embedding the micro-cross plate 4 into the recessed structure 20 of the detection disc 2, using the detection disc 2 and the pressure sensing device 3. The rotation of the detection disc 2 can drive the bottom of the micro-cross plate 4 to rotate, different torques are applied to the detection disc 2 by applying standard weights of different weights, and then a load gradient is obtained. This design ensures that the sensor can produce the same electrical parameters when subjected to the same external force during field operation, and then the corresponding parameters are collected, finally ensuring that the parameters obtained by the micro-cross plate 4 in the field test have reliability.

[0046] In order to facilitate the carrying of the calibration device, as shown in Figure 3 and Figure 4 , in a preferred embodiment, the mounting bracket 11 includes a joint assembly 110 and two oppositely arranged mounting racks 111, the joint assembly 110 is located between the two mounting racks 111 and connected with the mounting racks 111, the mounting racks 111 are detachably arranged on the mounting base 1, and the joint assembly 110 has a mounting cavity matched with the micro-cross plate 4. When it is necessary to perform calibration work in the field, the mounting racks 111 are detached to reduce the occupied space of the tool and facilitate the operator to carry it in a bag.

[0047] In order to adapt to the micro cross plates 4 of various specifications and shapes, on the basis of the above specific implementation direction, the joint assembly 110 comprises an outer ring joint 1100 and an inner ring joint 1101, the outer ring joint 1100 is connected to the mounting frame 111 by bolts, the inner ring joint 1101 is embedded in the outer ring joint 1100, the inner ring joint 1101 is provided in a hollow structure, and the micro cross plate 4 is embedded in the inner ring joint 1101. Specifically, the outer ring joint 1100 is used to mount the inner ring joint 1101, the inner ring joint 1101 is mounted and fixed on the outer ring joint 1100 in a fitting manner, the inner side wall of the outer ring joint 1100 cooperates with the limiting structure of the outer ring joint 1100 to ensure that the inner ring joint 1101 can be firmly fixed on the outer ring joint 1100, and when different micro cross plates 4 are calibrated, only the inner ring joint 1101 needs to be replaced.

[0048] Further, the mounting frame 111 comprises a mounting plate 1110 and a support plate 1111, the bottom of the mounting plate 1110 is provided with a protrusion 1112, the mounting seat 1 is provided with a mounting hole 14 which is plugged and matched with the protrusion 1112, the first end of the support plate 1111 extends outward to form a plug-in part 1113, the bottom of the mounting plate 1110 is provided with a groove which is plugged and matched with the plug-in part 1113, the plug-in part 1113 is provided with a screw hole, a bolt is plugged into the screw hole and is screwed with the mounting plate 1110, the second end of the support plate 1111 forms a notch for abutting the joint assembly 110, and the support plate 1111 is screwed with the joint assembly 110. The materials of the inner ring joint 1101, the outer ring joint 1100, the mounting plate 1110 and the support plate 1111 can be selected as needed, for example, aluminum alloy or nylon material, and they are formed by metal die casting or plastic injection molding.

[0049] In actual application, the detection ends of different micro cross plates 4 can be different, in order to ensure the applicability of the tooling, as shown in Figures 5 to 7 In a preferred embodiment, the detection disc 2 comprises a disc body 21, a disc shaft 22 and a rotating seat 23, the center of the disc body 21 is provided with an open bottom accommodating cavity 210, the top of the disc body 21 is provided with a through hole which is communicated with the accommodating groove, the top of the disc shaft 22 is provided with the recess structure 20, the disc shaft 22 is arranged in the accommodating cavity 210, and the recess structure 20 of the disc shaft 22 is exposed outside the disc body 21 through the through hole;

[0050] The side wall of the accommodating cavity 210 is provided with a first groove 211, the outer peripheral wall of the disc shaft 22 is provided with a second groove 220, and the first groove 211 and the second groove 220 form a limiting cavity for placing a pin shaft 212 in a surrounding manner;

[0051] The bottom of the disc shaft 22 is provided with a cylindrical groove 221, and the top of the rotating seat 23 is provided with a cylindrical boss 230. The cylindrical boss 230 is inserted into the cylindrical groove, and the rotating seat 23 is rotatably connected to the mounting seat 1.

[0052] Based on the above specific implementation direction, the top of the mounting base 1 is provided with a support platform 12, the support platform 12 is provided with a bearing 13, the detection disk 2 is embedded with the bearing 13, and the mounting bracket 11 is inserted and engaged with the support platform 12.

[0053] like Figure 8 As shown, in a preferred embodiment, the first bracket 31 includes a connecting seat 310 and a first hinge 311. The connecting seat 310 is connected to the outer wall of the mounting base 1. The mounting base 1 extends horizontally outward from the side facing away from the mounting base 1 to form a connecting plate 312. The first hinge 311 is disposed on the connecting plate 312. The pressure sensor 33 is horizontally disposed on the side of the mounting base 1 facing away from the mounting base 1, and the pressure sensor 33 is located below the connecting plate 312. The second bracket 32 ​​is rotatably connected to the first hinge 311.

[0054] Based on the above specific implementation direction, the second bracket 32 ​​includes a second hinge 320, a pulley bracket 321, and a pulley 322. The second hinge 320 is rotatably connected to the first hinge 311 via a pivot. The second hinge 320 is opposite to the detection end of the pressure sensor 33. The pulley bracket 321 is disposed on the end face of the second hinge 320 away from the pressure sensor 33. The pulley 322 is mounted on the pulley bracket 321. The cable passes around the pulley 322 and is connected to the detection disc 2. Pressure sensing devices 3 are provided on both sides of the mounting base 1. The pulleys 322 are mounted on the pulley brackets 321. The first hinge 311 and the hinge are rotatably connected by a pivot, forming a hinge. The hinge can drive the pulley bracket 321 to rotate around the pivot, so that one side of the pulley bracket 321 can contact and abut against the pressure sensor 33. The pressure sensor 33 is a column-type pressure sensor 33. The axis of the detection end of the pressure sensor 33 is perpendicular to the side of the pulley bracket 321. When the pulley bracket 321 rotates towards the pressure sensor 33 due to the gravity of the weight, the second hinge 320 can convert the force it receives into a horizontal force, so that the pressure sensor 33 is axially compressed, achieving correct force application.

[0055] Furthermore, the miniature crossbow 4 calibration fixture also includes a digital display screen, which is connected to the pressure sensor 33 and is used to display the load weight of the weight tray.

[0056] In addition, the calibration tool can be provided with a controller connected with the pressure sensor 33, the controller being internally provided with a control module, a communication module and a display module, the communication module being capable of being connected with a terminal and a computer of a user, the mounted weight of the pressure sensor 33 being displayed through the display module, or the communication module being controlled to upload the mounted weight to the terminal or the computer, the mounted weight being analyzed by a program of the computer to generate a stress response curve.

[0057] The miniature cross plate 4 calibration device can exert torque on the miniature cross plate 4 by hanging different weights on the weight tray, so that the loading calibration of the miniature cross plate 4 is realized, and the mounting seat 1 of the calibration tool can be placed on any desktop to operate, and the calibration environment requirement is low.

[0058] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical application or improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A micro cross plate calibration tool, characterized in that, The utility model relates to a kind of micro-displacement sensor, including: Mounting seat (1), the top of which is provided with mounting bracket (11), and the mounting bracket (11) is used to fix micro-cross plate (4); Detection disc (2) has recessed structure (20) with micro-cross plate (4) plug-in cooperation, and the detection disc (2) is rotatably connected with mounting seat (1); Pressure sensing device (3) is located on both sides of mounting seat (1), including first support (31), second support (32) and weight tray, the first support (31) is arranged on mounting seat (1), the first support (31) is provided with pressure sensor (33), the second support (32) is rotatably connected with the first support (31) by rotating shaft, and the detection end of the pressure sensor (33) is opposite to the second support (32), and the weight tray is connected with cable, and the cable is connected with detection disc (2) after passing through the second support (32).

2. The micro-plain strain stage according to claim 1, wherein, The mounting bracket (11) includes a joint assembly (110) and two oppositely arranged mounting racks (111), the joint assembly (110) is located between the two mounting racks (111) and connected with the mounting racks (111), the mounting racks (111) are detachably arranged on the mounting seat (1), and the joint assembly (110) has a mounting cavity matched with the micro-cross plate (4).

3. The micro-plain strain stage according to claim 2, wherein, The joint assembly (110) includes an outer ring joint (1100) and an inner ring joint (1101), the outer ring joint (1100) is connected with the mounting rack (111) by bolts, and the inner ring joint (1101) is embedded in the outer ring joint (1100), the inner ring joint (1101) is a hollow structure, and the micro-cross plate (4) is embedded in the inner ring joint (1101).

4. The micro-plain strain stage according to claim 2, wherein, The mounting rack (111) includes a mounting plate (1110) and a support plate (1111), the bottom of the mounting plate (1110) is provided with a protrusion (1112), the mounting seat (1) is provided with a mounting hole (14) matched with the protrusion (1112), the first end of the support plate (1111) extends outward to form a plug-in part (1113), the bottom of the mounting plate (1110) is provided with a groove matched with the plug-in part (1113), the plug-in part (1113) is provided with a threaded hole, and the bolt is threadedly connected with the mounting plate (1110) after penetrating the threaded hole, the second end of the support plate (1111) forms a notch for abutting the joint assembly (110), and the support plate (1111) is threadedly connected with the joint assembly (110).

5. The micro-rectangular box calibration fixture of claim 1, wherein, The detection disc (2) includes a disc body (21), a disc shaft (22) and a rotating seat (23), the center of the disc body (21) is provided with a bottom-open accommodating cavity (210), the top of the disc body (21) is provided with a through hole communicated with the accommodating groove, the top of the disc shaft (22) is provided with the recessed structure (20), the disc shaft (22) is arranged in the accommodating cavity (210), and the recessed structure (20) of the disc shaft (22) is exposed outside the disc body (21) through the through hole; The side wall of the accommodating cavity (210) is provided with a first groove (211), the outer peripheral wall of the disc shaft (22) is provided with a second groove (220), and the first groove (211) and the second groove (220) form a limiting cavity for placing a pin shaft (212); The bottom of the disc shaft (22) is provided with a cylindrical groove (221), the top of the rotating seat (23) is provided with a cylindrical boss (230), the cylindrical boss (230) is inserted into the cylindrical groove (221), and the rotating seat (23) is rotationally connected with the mounting seat (1).

6. The micro-plain strain stage according to claim 1, wherein, The top of the mounting seat (1) is provided with a supporting table (12), the supporting table (12) is provided with a bearing (13), the detection disc (2) is embedded in the bearing (13), and the mounting support (11) is inserted into the supporting table (12) in a matched mode.

7. The micro-rectangular box calibration fixture of claim 1, wherein, The first support (31) comprises a connecting seat (310) and a first hinge (311), the connecting seat (310) is connected to the outer side wall of the mounting seat (1), the mounting seat (1) extends outwardly and horizontally on the side away from the mounting seat (1) to form a connecting plate (312), the first hinge (311) is arranged on the connecting plate (312), the pressure sensor (33) is arranged horizontally on the side of the mounting seat (1) away from the mounting seat (1), and the pressure sensor (33) is located below the connecting plate (312), and the second support (32) is rotationally connected with the first hinge (311).

8. The micro-rectangular box calibration tool according to claim 7, wherein, The second support (32) comprises a second hinge (320), a pulley support (321) and a pulley (322), the second hinge (320) is rotationally connected with the first hinge (311) through a rotating shaft, the second hinge (320) is opposite to the detection end of the pressure sensor (33), the pulley support (321) is arranged on the end face of the second hinge (320) away from the pressure sensor (33), the pulley (322) is mounted on the pulley support (321), and the cable is connected to the detection disc (2) after winding around the pulley (322).

9. The micro-rectangular box calibration fixture of claim 1, wherein, A digital display screen is further included, the digital display screen is connected with the pressure sensor (33), and is used for displaying the hanging weight of the weight tray.

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