Novel force sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a novel force sensor. Comprising a main body, deformation grooves are formed in the two ends of the main body, strain gauges are fixed to the two sides of the top ends in the two deformation grooves, protective covers are slidably connected to the outer sides of the two deformation grooves, waterproof insulation paste is fixed to the inner sides of the protective covers, and second penetrating holes are formed in the positions, located at the bottoms of the strain gauges, in the main body. A first penetrating hole is formed in one side in the main body, the first penetrating hole is communicated with the second penetrating hole, and a wire pressing hoop is arranged at the top of the main body. According to the novel force sensor provided by the utility model, through cooperation of the main body, the deformation groove, the strain gauges, the protection cover and the first fastening screw, when the main body is located at the outer side of the second assembly groove and is subjected to thrust, the four strain gauges are enabled to detect a thrust value through deformation of the main body; and the outer side of the strain gauge is protected through the cooperation of the protection cover and the waterproof insulation paste, so that the thrust detection of the drilling machine can be more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a novel force sensor. Background Art

[0002] Tension and pressure sensors are widely used in material testing machines, various weighing scales, and force measurement systems of various engineering devices. When the force sensor is used in a drilling rig, it can detect thrust;

[0003] The patent document with the announcement number (CN219902780U) discloses a drill gun for strength testing, including a housing, a drilling device, a sliding mechanism and a driving mechanism; the drilling device includes a drilling motor, a drilling reducer, a torque speed sensor, a force sensor, a drilling bearing seat, a drilling shaft, a drill clamp and a drill bit; the driving mechanism includes a driving motor, a driving reducer, a driving bearing seat, a driving screw, a driving threaded sleeve and a transmission sleeve; the sliding mechanism includes a plurality of guide rails and a plurality of sliders arranged on the drilling device. The drilling device is driven by the driving mechanism to drill the material to be tested; during the drilling process, the torque, drilling speed and drilling force output by the drilling rig when drilling the material are tested by connecting an external test system to the torque speed sensor and the force sensor, and the strength of the object to be tested is calculated by these parameters;

[0004] When using the above technology, it was found that the following technical problems exist in the prior art: when using traditional tension and pressure sensors such as flange type and spoke type with existing structures, the structure is too large, and the detection of thrust under the action of additional bending moment is not accurate enough. Therefore, a new force sensor is designed to provide another technical solution to the above technical problems. Utility Model Content

[0005] Based on this, it is necessary to provide a new type of force sensor to address the above-mentioned technical problems, which is used to solve the technical problems that the traditional tension and pressure sensors such as flange type and spoke type used in existing drilling rigs are too large in structure, and the thrust detection under the action of additional bending moment is not accurate enough.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A new force sensor includes a main body, wherein deformation grooves are provided inside both ends of the main body, strain gauges are fixed on both sides of the top of the two deformation grooves, protective covers are slidably connected to the outer sides of the two deformation grooves, and waterproof insulating glue is fixed on the inner side of the protective cover.

[0008] As a preferred implementation of the novel force sensor provided by the utility model, a first assembly groove is provided inside the main body.

[0009] As a preferred implementation of the novel force sensor provided by the utility model, a second assembly groove is provided inside the bottom end of the main body.

[0010] As a preferred embodiment of the new force sensor provided by the utility model, a second through hole is opened inside the main body and located at the bottom of the strain gauge, a first through hole is opened on one side inside the main body, and the first through hole is connected to the second through hole.

[0011] As a preferred embodiment of the new force sensor provided by the utility model, a wire clamp is arranged on the top of the main body, and second fastening screws are arranged on both sides of the top of the wire clamp, and the bottom of the second fastening screw passes through the wire clamp and is threadedly connected to the main body.

[0012] As a preferred implementation of the novel force sensor provided by the utility model, first fastening screws are provided inside both sides of the protective cover, and one side of the first fastening screw passes through the protective cover and is threadedly connected to the main body.

[0013] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0014] At the same time, through the above technical solutions, the utility model has at least the following beneficial effects:

[0015] The utility model provides a novel force sensor, which cooperates with a main body, a deformation groove, a strain gauge, a protective cover and a first fastening screw, so that when the main body is located at the outer side of the second assembly groove and is subjected to thrust, the four strain gauges can detect the thrust value through the deformation of the main body, and the outer side of the strain gauge can be protected through the cooperation of the protective cover and the waterproof insulating glue, thereby enabling more accurate thrust detection of the drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a side view of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the deformation groove of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the utility model waterproof insulating adhesive;

[0021] Figure 5 It is a force schematic diagram of the utility model;

[0022] Figure 6 This is the circuit diagram of the strain gauge.

[0023] In the figure: 1. main body; 2. first assembly groove; 3. second assembly groove; 4. wire clamp; 5. deformation groove; 6. strain gauge; 7. protective cover; 8. first fastening screw; 9. first penetration hole; 10. second penetration hole; 11. waterproof insulating glue; 12. second fastening screw. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] Embodiment 1:

[0029] Reference Figure 1-Figure 4 A new type of force sensor includes a main body 1, a first assembly groove 2 is provided inside the main body 1, so that the motor output end in the drilling rig can be connected to other equipment through the first assembly groove 2, a second assembly groove 3 is provided inside the bottom end of the main body 1, so that the threaded rod in the drilling rig can drive the main body 1 inside the second assembly groove 3 and move outside the second assembly groove 3, deformation grooves 5 are provided inside both ends of the main body 1, and the deformation groove 5 is located between the first assembly groove 2 and the second assembly groove 3, strain gauges 6 are fixed on both sides of the top of the two deformation grooves 5, so that the deformation caused by the thrust at the bottom of the main body 1 located at the second assembly groove 3 can be detected by four strain gauges 6;

[0030] In this embodiment, the strain gauge 6 is a mature technology that has been disclosed in the prior art.

[0031] A second through hole 10 is provided inside the main body 1 and at the bottom of the strain gauge 6, a first through hole 9 is provided on one side inside the main body 1, and the first through hole 9 is connected with the second through hole 10, so that the connecting wire of the strain gauge 6 enters the first through hole 9 through the second through hole 10 and extends out through the first through hole 9, a wire clamp 4 is provided on the top of the main body 1, and the wire extending through the first through hole 9 can be fixed by the wire clamp 4, and second fastening screws 12 are provided on both sides of the top of the wire clamp 4, and the bottom of the second fastening screw 12 passes through the wire clamp 4 and is threadedly connected to the main body 1, and the wire clamp 4 and the main body 1 are fixed by the second fastening screw 12;

[0032] The outer sides of the two deformation grooves 5 are slidably connected with protective covers 7, and the inner side of the protective covers 7 is fixed with waterproof insulating glue 11. When the deformation groove 5 is closed by the protective covers 7, the outer side of the strain gauge 6 is protected by the waterproof insulating glue 11, so that the strain gauge 6 can be waterproof and insulated without affecting the collection of the deformation force of the main body 1. First fastening screws 8 are provided inside both sides of the protective covers 7. One side of the first fastening screw 8 passes through the protective cover 7 and is threadedly connected to the main body 1, so that the protective cover 7 and the main body 1 are fixed by the first fastening screws 8.

[0033] The use process of a new force sensor provided by the utility model is as follows: before use, four strain gauges 6 are divided into two groups and symmetrically installed inside the deformation groove 5, and the connecting wire of the strain gauge 6 is extended out of the first penetration hole 9 through the second penetration hole 10, and is pulled out through the first penetration hole 9 and fixed through the wire clamp 4, and then a protective cover 7 is installed on the outside of the deformation groove 5, and the protective cover 7 is fixed to the main body 1 through the first fastening screw 8, so that the outside of the strain gauge 6 is protected by the waterproof insulating glue 11. When in use, the main body 1 is placed inside the drilling rig, and the first assembly groove 2 is installed on the outside of the output end of the corresponding motor, so as not to affect the operation of the drilling rig, and the shaft sleeve is installed inside the second assembly groove 3 by bolts, so that the shaft sleeve is driven by the rotation of the threaded rod to drive the main body 1 outside the second assembly groove 3 to move, so that the main body 1 is deformed. When the main body 1 is deformed, the thrust data of the deformed main body 1 is collected through the strain gauge 6.

[0034] Embodiment 2:

[0035] refer to Figure 5 and Figure 6 After the sensor (main body 1) is subjected to the thrust F, the size T of the designed deformation groove 5 is adjusted to produce a corresponding relationship between its deformation and the force F, thereby realizing the test of the thrust force.

[0036] according to Figure 5As shown in the figure, the upper flange of the sensor is used to fix the sensor to the drilling system. The strain ε of sensors R1 and R2 can be obtained from the mechanical relationship. 1 , ε 2 They are:

[0037]

[0038] The resistors R3 and R4 are symmetrical to the resistors R1 and R2 on both sides of the sensor deformation slot 5. After being stressed, their strains are equal in magnitude and opposite in direction. It can be seen from equations (1) and (2) that the strain of the elastic body in the middle slot of the sensor is linearly proportional to the thrust F and is also related to the size of the deformation slot 5. Therefore, the range and sensitivity of the sensor can be designed by adjusting k and T. According to the relationship between the deformation of the strain gauge 6 and the change in resistance (Equation 3), when the deformation body is strained, the change in resistance of the strain gauge 6 is linearly related to the strain diameter.

[0039] ΔR=R×GF×ε (3)

[0040] Where: ΔR is the resistance change after strain occurs, R is the resistance of the strain gauge when no strain occurs, and GF is the strain gauge gain factor (constant). Use a Wheatstone full bridge to connect four strain gauges, such as Figure 6 shown.

[0041] Attach the four sets of strain gauges R1, R2, R3, and R4 to the Figure 1 In the position shown, when there is no deformation, the resistance of each strain gauge is R1=R2=R3=R4=R; where R1 and R3, R2 and R4 are symmetrical. According to equations (1) and (2), when deformation occurs under force, the resistance change of strain gauge 6 satisfies: ΔR1=ΔR2=-ΔR3=-ΔR4. Figure 6 The circuit structure shown is connected, and an excitation voltage U is applied between the U+ and U- ports. At this time, the voltages of the two ports U1 and U2 are:

[0042]

[0043] Then the voltage difference between U1 and U2 ports is:

[0044]

[0045] Finally, the U under different stress conditions was calibrated. m value, then when in use the output voltage U m Reverse calculate the structural forces.

[0046] After the strain gauge 6 is attached to the specified position, follow Figure 6The connecting bridge is connected, and the connecting wire passes through the first through hole 9 and the second through hole 10 and is fixed under the wire clamp 4 to prevent the wire end of the strain gauge 6 from being loosened due to stress.

[0047] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A new force sensor, characterized in that: The invention comprises a main body (1), wherein deformation grooves (5) are provided inside both ends of the main body (1), strain gauges (6) are fixed on both sides of the top ends of the two deformation grooves (5), protective covers (7) are slidably connected to the outsides of the two deformation grooves (5), and waterproof insulating glue (11) is fixed on the inside of the protective cover (7).

2. A novel force sensor according to claim 1, characterized in that: A first assembly groove (2) is provided inside the main body (1).

3. A novel force sensor according to claim 1, characterized in that: A second assembly groove (3) is provided inside the bottom end of the main body (1).

4. A novel force sensor according to claim 1, characterized in that: A second through hole (10) is provided inside the main body (1) and at the bottom of the strain gauge (6), a first through hole (9) is provided on one side inside the main body (1), and the first through hole (9) is connected to the second through hole (10).

5. A novel force sensor according to claim 1, characterized in that: A wire crimping hoop (4) is arranged on the top of the main body (1), and second fastening screws (12) are arranged on both sides of the top of the wire crimping hoop (4), and the bottom of the second fastening screw (12) passes through the wire crimping hoop (4) and is threadedly connected to the main body (1).

6. A novel force sensor according to claim 1, characterized in that: First fastening screws (8) are provided inside both sides of the protective cover (7), and one side of the first fastening screw (8) passes through the protective cover (7) and is threadedly connected to the main body (1).

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