Torque wrench with strain type force transducer

Abstract

The utility model provides a torque wrench with a strain type force transducer, which belongs to the technical field of torque wrenches and comprises a force applying rod, a force measuring rod is arranged at one end of the force applying rod, an elastic body is fixedly mounted at one end, close to the force applying rod, of the force measuring rod, a deformation hole is formed in the top of the elastic body, and the deformation hole penetrates through the elastic body. According to the torque wrench with the strain type force transducer, the force measuring rod, the elastic body, the strain gauge, the wire and the display instrument are arranged, the wrench head is placed on the top of a bolt needing to be screwed, the handle sheath is held by hand to control the force applying rod to rotate, and the force measuring rod is stressed to control the elastic body to deform; meanwhile, the resistance value of the strain gauge on the surface of the elastic body changes, the resistance value change of the strain gauge is converted into a voltage signal to be output and transmitted to a display instrument through a wire, and according to numerical value display of the display instrument, the magnitude of the external force applied when the hand-held handle sheath rotates at the moment can be accurately read in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of torque wrenches, in particular to a torque wrench with a strain type force measuring sensor. Background Art

[0002] With the growing demand for precise torque control in industrial manufacturing and maintenance, torque wrenches are a key tightening tool whose performance and precision directly affect the quality and reliability of bolt connections. Traditional torque wrenches directly attach strain gauges to the surface of the wrench handle or the force-adding head to achieve the conversion of force value and electrical signal, which makes the overall accuracy of the product relatively low, the consistency of positive and reverse torque is poor, the calibration process in production is inefficient, or the tightening operation is achieved through the preset torque value of the mechanical structure, which is prone to problems such as limited torque adjustment range and susceptibility to operator experience. It has a greater impact on precision assembly and high-standard occasions, and it is difficult to accurately read the torque applied by the torque wrench in real time. Utility Model Content

[0003] The utility model provides a torque wrench with a strain gauge force sensor, which solves the problem that traditional torque wrenches in the prior art rely on preset torque values ​​of mechanical structures to achieve tightening operations and are difficult to accurately read the torque applied by the torque wrench in real time.

[0004] The technical solution of the utility model is implemented as follows: a torque wrench with a strain-type force sensor comprises a force-adding rod, a force measuring rod is arranged at one end of the force-adding rod, an elastomer is fixedly installed at the end of the force-adding rod close to the force-adding rod, a deformation hole is arranged on the top of the elastomer, and the deformation hole penetrates the elastomer, strain gauges are symmetrically arranged on both sides of the elastomer, a fixing block is fixedly installed at the end of the elastomer away from the force measuring rod, two groups of fixing screw holes are arranged on the top of the fixing block, and the elastomer and the fixing block are located inside the force-adding rod, a handle sheath is arranged on the surface of the force measuring rod, and a connecting block is fixedly installed at the end of the force-adding rod away from the force measuring rod.

[0005] As a further solution of the utility model: a display instrument is embedded and fixedly installed at the central position of the surface of the force adding rod, a wire is provided at the bottom of one side of the fixed block, and the display instrument and the fixed block are connected by the wire.

[0006] As a further solution of the utility model: two groups of fixing bolts are arranged on the surface of the force adding rod close to the force measuring rod, and the fixing bolts pass through the force adding rod and are connected with the fixing screw holes correspondingly.

[0007] As a further solution of the utility model: a retaining ring is fixedly installed on one end of the handle sheath close to the force adding rod, and anti-slip patterns are provided on the surface of the handle sheath.

[0008] As a further solution of the utility model: a wrench seat is fixedly installed on one side of the connecting block, and a wrench head is fixedly installed on the bottom of the wrench seat.

[0009] The beneficial effects of the utility model are as follows: by arranging a force measuring rod, an elastic body, a strain gauge, a wire and a display instrument, the wrench head is placed on the top of the bolt to be tightened, and the handle sleeve is held to control the force rod to rotate, so that the force measuring rod is subjected to force to control the elastic body to deform, and at the same time, the strain gauge on the surface of the elastic body has a resistance change, and the resistance change of the strain gauge is converted into a voltage signal output and transmitted to the display instrument through the wire. According to the numerical display of the display instrument, the size of the external force applied when the handle sleeve is held to rotate at this time can be accurately read in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0013] Figure 3 It is a schematic diagram of the structure of the force measuring rod, elastic body and fixed block of the utility model;

[0014] In the figure: 1. force rod; 2. display instrument; 3. force measuring rod; 4. fixing bolt; 5. elastic body; 6. deformation hole; 7. strain gauge; 8. fixing block; 9. fixing screw hole; 10. wire; 11. handle cover; 12. retaining ring; 13. anti-slip pattern; 14. connecting block; 15. wrench seat; 16. wrench head. DETAILED DESCRIPTION

[0015] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Reference Figure 1-3As shown, the utility model provides a technical solution: a torque wrench with a strain type force sensor, including a force adding rod 1, a display instrument 2 is embedded and fixedly installed at the central position of the surface of the force adding rod 1, a wire 10 is provided at the bottom of one side of the fixed block 8, and the display instrument 2 and the fixed block 8 are connected by the wire 10. By providing the wire 10 and the display instrument 2, the resistance change of the deformation hole 6 is transmitted to the display instrument 2 through the wire 10, so that the display instrument 2 can display the force size of the force measuring rod 3 in real time.

[0017] A force measuring rod 3 is provided at one end of the force adding rod 1, and an elastic body 5 is fixedly installed at one end of the force measuring rod 3 close to the force adding rod 1. A deformation hole 6 is provided on the top of the elastic body 5, and the deformation hole 6 penetrates the elastic body 5. Due to the deformation hole 6, when the handle sheath 11 is rotated to drive the force measuring rod 3 to bend on one side of the elastic body 5, the elastic body 5 is bent and deformed at the same time, causing the deformation hole 6 to be deformed, thereby reducing the deformation of the elastic body 5;

[0018] Strain gauges 7 are symmetrically arranged on both sides of the elastic body 5. By arranging the strain gauges 7, when the elastic body 5 is bent and deformed, the strain gauges 7 are driven to bend synchronously, so that the resistance value of the strain gauges 7 changes. Then, the resistance value change of the strain gauges 7 is converted into a voltage signal output according to the Whist bridge. The magnitude of the voltage signal is related to the deformation magnitude of the strain gauges 7. The greater the force on the force measuring rod 3, the greater the deformation of the elastic body 5 and the strain gauges 7, and the greater the voltage signal.

[0019] A fixing block 8 is fixedly installed at one end of the elastomer 5 away from the force measuring rod 3, and two groups of fixing screw holes 9 are provided on the top of the fixing block 8, and the elastomer 5 and the fixing block 8 are located inside the force rod 1, and two groups of fixing bolts 4 are provided on the surface of the force rod 1 close to the force measuring rod 3, and the fixing bolts 4 pass through the force rod 1 and are connected with the fixing screw holes 9 accordingly. Because the fixing bolts 4 are provided, after the fixing block 8 is inserted into the interior of one end of the force rod 1 so that the fixing screw holes 9 can correspond to the fixing bolts 4, the fixing bolts 4 are tightened and passed through the force rod 1 to be inserted into the corresponding fixing screw holes 9, thereby clamping and fixing the fixing block 8 inside the force rod 1, so that the force measuring rod 3 can be fixed to one end of the force rod 1.

[0020] A handle cover 11 is provided on the surface of the force measuring rod 3, and a retaining ring 12 is fixedly installed on one end of the handle cover 11 close to the force rod 1. Anti-slip grooves 13 are provided on the surface of the handle cover 11. By providing the handle cover 11, when the handle cover 11 is held to control the force rod 1 to rotate, the anti-slip grooves 13 can increase the friction of both hands on the surface of the handle cover 11 to avoid slipping when the handle cover 11 is rotated. At the same time, the retaining ring 12 separates the handle cover 11 and the force rod 1 to prevent the operator's hands from sliding to the surface of the force rod 1.

[0021] A connection block 14 is fixedly installed at one end of the force-adding rod 1 away from the force-measuring rod 3. A wrench seat 15 is fixedly installed on one side of the connection block 14, and a wrench head 16 is fixedly installed at the bottom of the wrench seat 15. Since the wrench head 16 is provided, the wrench head 16 is inserted into the top of the corresponding bolt to control the force-adding rod 1 to rotate, thereby tightening or loosening the bolt.

[0022] The working principle of the utility model is:

[0023] After connecting the display instrument 2 and the fixed block 8 with the wire 10, insert the fixed block 8 and the elastic body 5 into one end of the force-adding rod 1, rotate the fixed block 8 so that the fixing screw hole 9 is vertically upward and corresponds to the fixing bolt 4, tighten the fixing bolt 4 and insert the fixing screw hole 9 to clamp and fix the fixed block 8 inside the force-adding rod 1, and then put the handle sheath 11 on the surface of the force-measuring rod 3 until the retaining ring 12 is in close contact with the force-adding rod 1, hold the handle sheath 11 and align the wrench head 16 with the top of the bolt to be screwed, gradually apply external force to the handle sheath 11, so that the force-adding rod 1 rotates around the wrench head 16, when the handle sheath 11 is rotated by the external force, the force-measuring rod 3 drives the elastic body 5 to bend and deform, so that the strain gauge 7 is bent synchronously, and the resistance change of the deformation of the strain gauge 7 is converted into a voltage signal through the Whitster bridge and transmitted to the display instrument 2 from the wire 10, so that the grip force applied to the force-measuring rod 3 is displayed on the display instrument 2 in real time.

[0024] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A torque wrench with a strain gauge force sensor, comprising a force adding rod (1), characterized in that: A force measuring rod (3) is provided at one end of the force adding rod (1); an elastic body (5) is fixedly installed at the end of the force measuring rod (3) close to the force adding rod (1); a deformation hole (6) is provided at the top of the elastic body (5), and the deformation hole (6) passes through the elastic body (5); strain gauges (7) are symmetrically provided on both sides of the elastic body (5); a fixing block (8) is fixedly installed at the end of the elastic body (5) away from the force measuring rod (3); two groups of fixing screw holes (9) are provided at the top of the fixing block (8); the elastic body (5) and the fixing block (8) are located inside the force adding rod (1); a handle sheath (11) is provided on the surface of the force measuring rod (3); and a connecting block (14) is fixedly installed at the end of the force adding rod (1) away from the force measuring rod (3).

2. A torque wrench with a strain gauge force sensor as claimed in claim 1, characterized in that: A display instrument (2) is embedded and fixedly installed at the central position of the surface of the force adding rod (1), a wire (10) is provided at the bottom of one side of the fixed block (8), and the display instrument (2) and the fixed block (8) are connected via the wire (10).

3. A torque wrench with a strain gauge force sensor as claimed in claim 1, characterized in that: Two groups of fixing bolts (4) are provided on the surface of the force-adding rod (1) close to the force-measuring rod (3), and the fixing bolts (4) pass through the force-adding rod (1) and are connected to the fixing screw holes (9) correspondingly.

4. A torque wrench with a strain gauge force sensor as claimed in claim 1, characterized in that: A retaining ring (12) is fixedly mounted on one end of the handle sheath (11) close to the force-adding rod (1), and anti-slip grooves (13) are provided on the surface of the handle sheath (11).

5. A torque wrench with a strain gauge force sensor as claimed in claim 1, characterized in that: A wrench seat (15) is fixedly mounted on one side of the connecting block (14), and a wrench head (16) is fixedly mounted on the bottom of the wrench seat (15).

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