Tension monitoring sensor

Abstract

The utility model relates to the technical field of tension sensors, in particular to a tension monitoring sensor which comprises a sensor body, a resistance strain piece is arranged in the center of the sensor body, a connecting wire electrically connected with the resistance strain piece is arranged on the side wall of the middle of the sensor body, and threaded connectors are arranged at the two ends of the sensor body. A connecting rod is installed on the threaded connector in a threaded mode, the threaded connector communicates with a movable cavity formed in the sensor body, a U-shaped clamping block is arranged in the movable cavity, a rotating rod is rotationally connected to the side, away from the side provided with the U-shaped groove, of the U-shaped clamping block, and rotating blocks are hinged to the two ends of the side, provided with the U-shaped groove, of the U-shaped clamping block; an inclined guide block matched with the rotating block is arranged on the side, away from the rotating rod, of the movable cavity, and an annular groove matched with the U-shaped groove is formed in the side wall of the lower portion of the connecting rod. According to the utility model, the connecting rod is prevented from loosening under the action of external tension.

Description

Technical Field

[0001] This utility model relates to the field of tension sensor technology, and in particular to a tension monitoring sensor. Background Technology

[0002] A tension sensor, also known as a resistance strain gauge sensor, works by causing an elastic body to deform under external force. This deformation causes the resistance strain gauge attached to its surface to also deform. As the strain gauge deforms, its resistance value increases or decreases. The corresponding measuring circuit then converts this resistance change into an electrical signal, thus completing the process of converting external force into an electrical signal.

[0003] For example, a patent entitled "S-type Tension and Compression Sensor" with announcement number CN112179531A, published on March 1, 2017, includes a sensor body and a connecting wire. The sensor body has mounting holes at both the upper and lower ends, and two positioning holes are opened on both sides of the mounting holes. An adjustable tension mechanism and a fixed pressure mechanism are movably installed in the mounting holes. The connecting wire includes a connector and a cable. Limit plates are fixedly installed at both ends of the connector. This invention, by setting a fixed pressure mechanism, can prevent slippage under pressure during pressure testing, thus preventing the invention from flying off and improving safety. However, the mounting holes at both ends of the sensor body are only connected to the hanging rod by threads. The hanging rod may loosen, making the connection between the sensor body and the external connection not firm enough, affecting the detection effect. Summary of the Invention

[0004] The purpose of this invention is to provide a tensile force monitoring sensor to solve the problem that the connection between the tensile force sensor and the external connection is not secure enough during use.

[0005] To achieve the above objectives, this utility model provides a tensile force monitoring sensor, comprising a sensor body, a display screen electrically connected to one side of the sensor body, a resistance strain gauge disposed at the center of the sensor body, a connecting wire electrically connected to the resistance strain gauge disposed on the middle side wall of the sensor body, threaded connection ports at both ends of the sensor body, a connecting rod threadedly mounted on the threaded connection port, a threaded section on the connecting rod that mates with the threaded connection port, the threaded connection port communicating with a movable cavity disposed within the sensor body, and the two side walls of the sensor body respectively... Each end has an opening, which communicates with two movable cavities. A U-shaped locking block is provided in each movable cavity. A rotating rod is rotatably connected to the side of the U-shaped locking block away from the U-shaped groove, passing through the opening. The rotating rod is threaded into the opening. Rotating blocks are hinged at both ends of the side of the U-shaped locking block with the U-shaped groove. An arc-shaped groove is provided on the side of the two rotating blocks facing each other. An inclined guide block is provided on the side of the movable cavity away from the opening, which cooperates with the rotating block. The two inclined guide blocks are symmetrically arranged. An annular groove is provided on the lower side wall of the connecting rod, which cooperates with the U-shaped groove.

[0006] Optionally, a cylindrical elastomer is provided in the middle of the sensor body, and the two threaded connection ports are respectively located at both ends of the cylindrical elastomer.

[0007] Optionally, the resistance strain element includes a plurality of resistance strain gauges arranged at equal angles around the axis of the cylindrical elastic body.

[0008] Optionally, the sensor body has an embedding groove that cooperates with the resistance strain gauge.

[0009] Optionally, a guide rail is provided on the inner sidewall of the movable cavity, and a slider that is slidably connected to the guide rail is provided on the U-shaped block.

[0010] Optionally, a slanted guide block is provided on the side of the rotating block away from the U-shaped card block, and the rotating block is configured to cooperate with the slanted guide block.

[0011] Optionally, the end of the connecting rod is provided with a locking handle, and the locking handle has a hanging hole in the middle.

[0012] Optionally, a sleeve block is fitted on the connecting rod, and slots are provided on both sides of the threaded connection port. A stop block is provided on the sleeve block to cooperate with the slot. When the connecting rod is fastened at the threaded connection port, the stop block is inserted into the slot, and the locking handle abuts against the stop block.

[0013] Optionally, the sleeve block has a mating groove that mates with the lower part of the locking handle, and the mating groove is a circular groove.

[0014] The beneficial effects of this utility model are as follows: The tensile force monitoring sensor provided by this utility model has the connecting rod rotating and extending into the threaded connection port. The annular groove on the side wall of the connecting rod extends into the movable cavity and is located on one side of the U-shaped locking block. Then, the rotating rod is rotated, causing it to extend into the opening and drive the U-shaped locking block to move towards the inclined guide block. The two rotating blocks extend into the annular groove and, upon contacting the inclined guide block, rotate towards each other along the inclined surface of the inclined guide block. The U-shaped groove of the U-shaped locking block contacts one side wall of the connecting rod in the annular groove, and the arc-shaped grooves of the two rotating blocks contact the other side wall of the connecting rod in the annular groove. The U-shaped locking block and the two rotating blocks facilitate the locking and fixing of the connecting rod, which helps to prevent the connecting rod from loosening under the action of external tensile force. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the sensor body of the mounting sleeve of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the sensor body of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the connecting rod and the U-shaped locking block of this utility model;

[0019] Figure 5 This is a schematic diagram of the connecting rod of this utility model.

[0020] In the diagram: 1. Sensor body; 2. Resistance strain gauge; 3. Connecting wire; 4. Threaded connection; 5. Connecting rod; 6. U-shaped locking block; 7. Movable cavity; 8. Rotating rod; 9. Inclined guide block; 10. Chamfered corner block; 11. Rotating block; 12. Arc groove; 13. Locking handle; 14. Sleeve block; 15. Slot; 16. Abutment block; 17. Opening; 18. Annular groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Example 1

[0022] like Figures 1 to 5As shown, a tensile force monitoring sensor includes a sensor body 1. The sensor body 1 is electrically connected to a display screen located on one side of the sensor body 1. Data detected by the sensor body 1 is transmitted to the display screen for display, allowing operators to record data by observing the display screen. A resistance strain gauge 2 is disposed at the center of the sensor body 1. A connecting line 3, electrically connected to the resistance strain gauge 2, is disposed on the middle side wall of the sensor body 1. Both ends of the sensor body 1 are provided with threaded connection ports 4. A connecting rod 5 is threadedly installed on the threaded connection port 4. The connecting rod 5 has a threaded section that engages with the threaded connection port 4. The threaded connection port 4 communicates with a movable cavity 7 disposed within the sensor body 1. Both sides of the body 1 have openings 17 near one end, and the two openings 17 are respectively connected to the two movable cavities 7. A U-shaped locking block 6 is provided in the movable cavity 7. A rotating rod 8 that passes through the opening 17 is rotatably connected to the side of the U-shaped locking block 6 away from the side with the U-shaped groove. The rotating rod 8 is threadedly engaged with the opening 17. Rotating blocks 11 are hinged at both ends of the side with the U-shaped groove on the U-shaped locking block 6. An arc groove 12 is provided on the side of the two rotating blocks 11 facing each other. An inclined guide block 9 that cooperates with the rotating block 11 is provided on the side of the movable cavity 7 away from the opening 17. The two inclined guide blocks 9 are symmetrically arranged. An annular groove 18 that cooperates with the U-shaped groove is provided on the lower side wall of the connecting rod 5.

[0023] The connecting rod 5 is rotated into the threaded connection port 4. The annular groove 18 on the side wall of the connecting rod 5 extends into the movable cavity 7 and is located on one side of the U-shaped locking block 6. Then, the rotating rod 8 is rotated so that the rotating rod 8 rotates into the opening 17, driving the U-shaped locking block 6 to move towards the inclined guide block 9. The two rotating blocks 11 extend into the annular groove 18 and abut against the inclined guide block 9. Along the inclined surface of the inclined guide block 9, the two rotating blocks 11 rotate towards each other. The U-shaped groove of the U-shaped locking block 6 contacts one side wall of the connecting rod 5 in the annular groove 18, and the arc groove 12 of the two rotating blocks 11 contacts the other side wall of the connecting rod 5 in the annular groove 18. The U-shaped locking block 6 and the two rotating blocks 11 facilitate the locking and fixing of the connecting rod 5, which helps to prevent the connecting rod 5 from loosening under the action of external tension. Example 2

[0024] like Figures 1 to 5As shown, a tensile force monitoring sensor includes a sensor body 1, which is cylindrical. The sensor body 1 includes a housing, in which a cylindrical elastic body is disposed in the middle. Two threaded connection ports 4 are respectively located at both ends of the cylindrical elastic body. A resistance strain element 2 is disposed at the center of the sensor body 1. The resistance strain element 2 includes multiple resistance strain gauges arranged at equal angles around the axis of the cylindrical elastic body. The number of resistance strain gauges is preferably sixteen. In addition, the centers of the multiple resistance strain gauges are located on the same horizontal plane. A connecting line 3 electrically connected to the resistance strain element 2 is disposed on the middle sidewall of the sensor body 1. Threaded connection ports 4 are provided at both ends of the sensor body 1. A connecting rod 5 is threadedly installed on the threaded connection port 4. The connecting rod 5 is provided with a threaded section that is threaded to the threaded connection port 4. The threaded connection port 4 is connected to a... A movable cavity 7 is placed inside the sensor body 1. Openings 17 are provided on both side walls of the sensor body 1, near one end of each opening. The two openings 17 communicate with the two movable cavities 7. A U-shaped locking block 6 is provided inside the movable cavity 7. A rotating rod 8, passing through the opening 17, is rotatably connected to the side of the U-shaped locking block 6 away from the U-shaped groove. The rotating rod 8 is threaded into the opening 17. Rotating blocks 11 are hinged to both ends of the side of the U-shaped locking block 6 with the U-shaped groove. An arc-shaped groove 12 is provided on the side of the two rotating blocks 11 facing each other. An inclined guide block 9, cooperating with the rotating block 11, is provided on the side of the movable cavity 7 away from the opening 17. The two inclined guide blocks 9 are symmetrically arranged. An annular groove 18, cooperating with the U-shaped groove, is provided on the lower side wall of the connecting rod 5 to prevent the connecting rod from loosening under external tension.

[0025] The sensor body 1 has an embedding groove that cooperates with the resistance strain gauge, which facilitates the installation of the resistance strain gauge.

[0026] A guide rail is provided on the inner wall of the movable cavity 7, and a slider is provided on the U-shaped block 6 that is slidably connected to the guide rail, so as to restrict the movement direction of the U-shaped block 6 and prevent the U-shaped block 6 from deviating.

[0027] like Figure 3 and Figure 4As shown, the rotating block 11 has chamfered corner blocks 10 at both ends on the side away from the U-shaped locking block 6. The rotating block 11 is configured to cooperate with the inclined guide block 9 through the chamfered corner blocks 10. This allows the rotating block 11 to pass through the annular groove 18 in the movable cavity 7 as it continues to penetrate deeper into the movable cavity 7. Then, through the cooperation of the inclined guide block 9 and the chamfered corner blocks 10, the two rotating blocks 11 move closer to the connecting rod 5 in the annular groove 18 until the arc groove 12 of the rotating block 11 contacts the outer wall of the connecting rod 5. The two rotating blocks 11 wrap around the connecting rod 5 in the annular groove 18, which helps to prevent the connecting rod 5 from loosening under the action of external tension.

[0028] The connecting rod 5 is provided with a locking handle 13 at its end. The locking handle 13 has a hanging hole in the middle. When the tensile test is performed, the hanging hole facilitates the tensile test.

[0029] A sleeve block 14 is fitted onto the connecting rod 5. A slot 15 is provided on both sides of the threaded connection port 4. A stop block 16 is provided on the sleeve block 14 to cooperate with the slot 15. When the connecting rod 5 is fastened to the threaded connection port 4, the stop block 16 is inserted into the slot 15, and the locking handle 13 abuts against the stop block 16. During pressure testing, this can prevent slippage under pressure and improve the safety of use.

[0030] The sleeve block 14 has a mating groove that mates with the lower part of the locking handle 13. The mating groove is a circular groove, which facilitates the lower part of the locking handle 13 to rotate and extend into the mating groove when the connecting rod 5 is spirally inserted into the threaded connection port 4.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0032] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A monitoring tensile force sensor, comprising a sensor body (1), a display screen is electrically connected on one side of the sensor body (1), a resistance strain piece (2) is arranged at the central position of the sensor body (1), a connecting line (3) electrically connected with the resistance strain piece is arranged on the side wall of the middle part of the sensor body (1), threaded connection ports (4) are arranged at both ends of the sensor body (1), connecting rods (5) are threadedly installed on the threaded connection ports (4), and threaded sections threadedly matched with the threaded connection ports (4) are arranged on the connecting rods (5), characterized in that, The threaded connection port (4) is communicated with a movable cavity (7) arranged in the sensor body (1), both side walls of the sensor body (1) are provided with an opening (17) close to one end, respectively, and the two openings (17) are communicated with two movable cavities (7), a U-shaped clamping block (6) is arranged in the movable cavity (7), a rotating rod (8) penetrating the opening (17) is rotatably connected to one side of the U-shaped clamping block (6) away from the U-shaped groove, the rotating rod (8) is arranged in threaded connection with the opening (17), two rotating blocks (11) are hingedly arranged at both ends of the side of the U-shaped clamping block (6) provided with the U-shaped groove, an arc-shaped groove (12) is arranged on the side of the two rotating blocks (11) facing each other, and an inclined guide block (9) matched with the rotating block (11) is arranged on the side of the movable cavity (7) away from the opening (17), the two inclined guide blocks (9) are symmetrically arranged, and an annular groove (18) matched with the U-shaped groove is arranged on the lower side wall of the connecting rod (5).

2. A tension monitoring sensor according to claim 1, wherein The cylindrical elastic body is arranged in the middle of the sensor body (1), and the two threaded connection ports (4) are located at both ends of the cylindrical elastic body, respectively.

3. A tension monitoring sensor according to claim 2, wherein, The resistance strain element (2) comprises a plurality of resistance strain gauges arranged at equal angles around the axis of the cylindrical elastic body.

4. A tension monitoring sensor according to claim 3, wherein The sensor body (1) is provided with an embedded groove matched with the resistance strain gauge.

5. The monitoring tensile force sensor according to claim 1, wherein A guide rail is arranged on the inner side wall of the movable cavity (7), and a sliding block matched with the guide rail is arranged on the U-shaped clamping block (6).

6. The monitoring tensile force sensor of claim 1, wherein, An inclined guide block (9) is arranged on the side of the rotating block (11) away from the U-shaped clamping block (6), and the rotating block (11) is matched with the inclined guide block (9) through the inclined guide block (9).

7. The monitoring tensile force sensor of claim 1, wherein, A locking handle (13) is arranged at the end of the connecting rod (5), and a hanging hole is arranged in the middle of the locking handle (13).

8. A tension monitoring sensor according to claim 7, wherein, A sleeve block (14) is arranged on the connecting rod (5), clamping grooves (15) are arranged on both sides of the threaded connection port (4), a clamping block (16) matched with the clamping groove (15) is arranged on the sleeve block (14), when the connecting rod (5) is fastened at the threaded connection port (4), the clamping block (16) is inserted into the clamping groove (15), and the locking handle (13) abuts against the clamping block (16).

9. A monitoring tensile force sensor according to claim 8, characterized in that A matching groove matched with the lower part of the locking handle (13) is arranged on the sleeve block (14), and the matching groove is a circular groove.

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