Strain gauge with alarm system

Abstract

The utility model provides a strain gauge with an alarm system. The strain gauge with the alarm system comprises a vibrating wire type strain gauge, a protective cover used for protecting the vibrating wire type strain gauge is installed on the side wall of the workpiece, a cable extends into the protective cover to be electrically connected with the vibrating wire type strain gauge, and an early warning mechanism is installed on the surface of the protective cover. A fixing mechanism is installed at the connecting position of the cable and the protective cover and comprises a fixing sleeve, the fixing sleeve is installed on the side wall of the protective cover, the interior of the fixing sleeve is in threaded connection with a threaded sleeve, a sealing ring is installed at one end of the threaded sleeve, a clamping groove is formed in one end of the fixing sleeve, and a clamping groove is formed in the other end of the fixing sleeve. The sealing ring is connected into the clamping groove in a sliding mode. A plurality of fixing rings are installed on the inner side wall of the sealing ring, and the fixing rings abut against the side wall of the cable. The strain gauge with the alarm system provided by the utility model has the advantages of protecting the cable and reducing monitoring interference.

Description

Technical Field

[0001] The utility model relates to the technical field of surface strain gauges, in particular to a strain gauge with an alarm system. Background Art

[0002] Surface strain gauges are suitable for long-term deployment on the surface of hydraulic structures or other structures to measure the strain on the surface of the structure and to simultaneously measure the temperature of the deployment point. Vibrating wire surface strain gauges have a small elastic modulus and good tracking properties with the measured structure. They will not interfere with the original stress field during measurement and can be recycled and reused.

[0003] When using surface strain gauges to monitor foundation pit support steel beams, since the surface strain gauges are exposed to the outside, impurities such as dust and rainwater can easily enter the connection between the cable and the surface strain gauge. In addition, the cable is easily pulled during construction, causing the cable to separate from the surface strain gauge, resulting in poor line contact and affecting the monitoring effect.

[0004] Therefore, it is necessary to provide a new strain gauge with an alarm system to solve the above technical problems. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a strain gauge with an alarm system which can protect cables and reduce monitoring interference.

[0006] In order to solve the above technical problems, the strain gauge with an alarm system provided by the utility model includes: a vibrating-wire strain gauge, which is fixed to the surface of a workpiece through a support, a protective cover for protecting the vibrating-wire strain gauge is installed on the side wall of the workpiece, a cable is extended into the interior of the protective cover and is electrically connected to the vibrating-wire strain gauge, and an early warning mechanism is installed on the surface of the protective cover; a fixing mechanism is installed at the connection between the cable and the protective cover, the fixing mechanism includes a fixing sleeve, the fixing sleeve is installed on the side wall of the protective cover, the interior of the fixing sleeve is threadedly connected to a screw sleeve, a sealing ring is installed at one end of the screw sleeve, a groove is provided at one end of the fixing sleeve, and the sealing ring is slidably connected to the interior of the groove; a plurality of fixing rings are installed on the inner side wall of the sealing ring, and the fixing ring contacts the side wall of the cable.

[0007] Preferably, the support includes a lower base, the lower base is welded to the surface of the workpiece, the lower base is connected to the upper base by bolts, and the vibrating wire strain gauge is installed between the lower base and the upper base.

[0008] Preferably, the protective cover includes an outer shell, the outer shell is installed on the surface of the workpiece, a rubber pad is installed on the bottom of the outer shell, and the rubber pad contacts the surface of the workpiece; the side wall of the lower base is symmetrically fixedly connected to a fixing block, the fixing block is threadedly connected to a screw, and the screw contacts the side wall of the outer shell.

[0009] Preferably, the side wall cross-section of the rubber pad is funnel-shaped, and the bottom surface of the rubber pad is a wavy structure.

[0010] Preferably, the early warning mechanism comprises a mounting plate, the mounting plate is mounted on the top surface of the housing, a plurality of warning lights are mounted on the surface of the mounting plate, and the warning lights are electrically connected to the cable.

[0011] Preferably, the interior of the slot is in a hollow frustum shape, and the cable runs through the slot.

[0012] Preferably, the side wall cross section of the sealing ring is in a "T"-shaped structure, and the side wall cross section of the fixing ring is in an arc-shaped structure.

[0013] Compared with the related art, the strain gauge with alarm system provided by the utility model has the following beneficial effects:

[0014] The utility model provides a strain gauge with an alarm system. When the vibrating-wire strain gauge is used to monitor the workpiece, the protective cover covers the vibrating-wire strain gauge to prevent the environment from affecting the operation of the vibrating-wire strain gauge. The fixing sleeve is installed at the connection between the cable and the protective cover. The screw sleeve is rotated, and the screw sleeve rotates into the interior of the fixing sleeve. The screw sleeve drives the sealing ring to enter the interior of the fixing sleeve and the slot. The interior of the slot is in a hollow truncated cone shape. As the sealing ring enters the interior of the slot, the extrusion force between the sealing ring and the fixing sleeve becomes larger and larger, so that the sealing ring gradually contracts and squeezes the side wall of the cable, increasing the extrusion force between the sealing ring and the cable. force, so that the sealing ring fills the gap between the cable and the fixing sleeve, preventing impurities such as dust and water from entering the connection between the cable and the vibrating-wire strain gauge, and reducing interference factors; and a plurality of fixing rings made of rubber are installed inside the sealing ring, and the fixing rings are squeezed and pressed against the side walls of the cable, thereby increasing the friction of the cable inside the sealing ring, and the side wall cross-section of the fixing ring is arc-shaped. When an external force pulls the cable to slide out of the inside of the protective cover, the inclination direction of the fixing ring is opposite to the movement direction of the cable, and the fixing ring increases the resistance to the movement of the cable, thereby preventing the cable from sliding out of the inside of the protective cover and preventing the cable from detaching from the vibrating-wire strain gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a strain gauge with an alarm system provided by the utility model;

[0016] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at A shown;

[0017] Figure 3 for Figure 2 An enlarged schematic diagram of the structure at B shown;

[0018] Figure 4 for Figure 1 The internal structure of the shell is shown in the side view;

[0019] Figure 5 for Figure 1 A top view of the housing structure shown;

[0020] Figure 6 This is a schematic diagram of the circuit structure provided by the utility model.

[0021] Numbers in the figure: 1. workpiece, 2. vibrating-wire strain gauge, 3. support, 31. lower base, 32. upper base, 33. bolt, 4. protective cover, 41. housing, 42. screw, 43. rubber pad, 44. fixing block, 5. cable, 6. fixing mechanism, 61. fixing sleeve, 62. screw sleeve, 63. sealing ring, 64. slot, 65. fixing ring, 7. early warning mechanism, 71. mounting plate, 72. warning light. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 .in Figure 1 A schematic diagram of the structure of a strain gauge with an alarm system provided by the utility model; Figure 2 for Figure 1 An enlarged schematic diagram of the structure at A shown; Figure 3 for Figure 2 An enlarged schematic diagram of the structure at B shown; Figure 4 for Figure 1 The internal structure of the shell is shown in the side view; Figure 5 for Figure 1 A top view of the housing structure shown; Figure 6The present invention provides a circuit structure schematic diagram. A strain gauge with an alarm system includes: a vibrating-wire strain gauge 2, the vibrating-wire strain gauge 2 is fixed to the surface of a workpiece 1 through a support 3, the support 3 includes a lower base 31, the lower base 31 is welded to the surface of the workpiece 1, the lower base 31 is connected to an upper base 32 through a bolt 33, and the vibrating-wire strain gauge 2 is installed between the lower base 31 and the upper base 32; when installing the vibrating-wire strain gauge 2, the vibrating-wire strain gauge 2 is placed inside the lower base 31, the upper base 32 is fixed above the lower base 31 by the bolt 33, the lower base 31 and the upper base 32 squeeze the vibrating-wire strain gauge 2, and the vibrating-wire strain gauge 2 is fixed to the surface of the workpiece 1.

[0024] The side wall of the workpiece 1 is installed with a protective cover 4 for protecting the vibrating-wire strain gauge 2, and the protective cover 4 includes a shell 41, the shell 41 is installed on the surface of the workpiece 1, and a rubber pad 43 is installed on the bottom surface of the shell 41, and the rubber pad 43 contacts the surface of the workpiece 1; the side wall of the lower base 31 is symmetrically fixedly connected with a fixing block 44, and the fixing block 44 is threadedly connected with a screw 42, and the screw 42 contacts the side wall of the shell 41; when the vibrating-wire strain gauge 2 is installed, the shell 41 is placed above the vibrating-wire strain gauge 2, and the screw 42 is rotated into the shell 41. As the screw rod 42 rotates and squeezes the shell 41 inside the fixing block 44, the shell 41 squeezes the rubber pad 43 downward, so that the rubber pad 43 is closely attached to the surface of the workpiece 1, thereby preventing dust, water and other impurities from entering the interior of the protective cover 4; the side wall cross-section of the rubber pad 43 is funnel-shaped, which increases the contact area between the rubber pad 43 and the workpiece 1, thereby improving the sealing performance; the bottom surface of the rubber pad 43 is a wavy structure, and the rubber pad 43 is squeezed, and the wavy rubber pad 43 is stretched downward and closely attached to the surface of the workpiece 1, further increasing the contact area and improving the sealing performance.

[0025] A fixing mechanism 6 is installed at the connection between the cable 5 and the protective cover 4, and the fixing mechanism 6 includes a fixing sleeve 61. The fixing sleeve 61 is installed on the side wall of the protective cover 4, and the interior of the fixing sleeve 61 is threadedly connected to a screw sleeve 62. A sealing ring 63 is installed at one end of the screw sleeve 62, and a groove 64 is provided at one end of the fixing sleeve 61. The sealing ring 63 is slidably connected to the interior of the groove 64; a plurality of fixing rings 65 are installed on the inner side wall of the sealing ring 63, and the fixing ring 65 contacts the side wall of the cable 5; the interior of the groove 64 is hollow truncated cone-shaped, and the cable 5 passes through the groove 64; the side wall cross-section of the sealing ring 63 is T-shaped, and the side wall cross-section of the fixing ring 65 is arc-shaped. When fixing the cable 5, the screw sleeve 62 is rotated, and the screw sleeve 62 rotates into the interior of the fixing sleeve 61, and the screw sleeve 62 drives the sealing ring 63 to enter the interior of the fixing sleeve 61 and the slot 64. The interior of the slot 64 is in a hollow truncated cone shape. As the sealing ring 63 enters the interior of the slot 64, the extrusion force between the sealing ring 63 and the fixing sleeve 61 becomes larger and larger, so that the sealing ring 63 gradually contracts and squeezes the side wall of the cable 5, increasing the extrusion force between the sealing ring 63 and the cable 5, so that the sealing ring 63 fills the gap between the cable 5 and the fixing sleeve 61, preventing impurities such as dust and water from entering. The connection between the cable 5 and the vibrating-wire strain gauge 1 is reduced to reduce interference factors; and a plurality of fixing rings 65 made of rubber are installed inside the sealing ring 63, and the fixing rings 65 are squeezed and pressed against the side walls of the cable 5 to increase the friction of the cable 5 inside the sealing ring 63, and the side wall cross-section of the fixing ring 65 is arc-shaped. When an external force pulls the cable 5 to slide out from the inside of the protective cover 4, the inclination direction of the fixing ring 65 is opposite to the movement direction of the cable 5. The fixing ring 65 increases the resistance to the movement of the cable 5, thereby preventing the cable 5 from sliding out from the inside of the protective cover 4 and preventing the cable 5 from being separated from the vibrating-wire strain gauge 2.

[0026] The cable 5 extends into the interior of the protective cover 4 and is electrically connected to the vibrating-wire strain gauge 2, and an early warning mechanism 7 is installed on the surface of the protective cover 4; the early warning mechanism 7 includes a mounting plate 71, the mounting plate 71 is installed on the top surface of the outer shell 41, a plurality of warning lights 72 are installed on the surface of the mounting plate 71, and the warning lights 72 are electrically connected to the cable 5. When the vibrating-string strain gauge 2 monitors the workpiece 1, the vibrating-string strain gauge 2 is connected to a reader via the cable 5. The reader is connected to an external power supply, and the data of the vibrating-string strain gauge 2 detecting the workpiece 1 can be viewed via the reader. The reader is connected to the warning light 72 via the cable 5 to control the operation of the warning light 72, so as to judge whether the workpiece 1 is in a safe state by observing whether different warning lights 72 are on. When the workpiece 1 is in a normal state, the operating light is on and the other warning lights are off. When the working state of the workpiece 1 is at the strain critical point, the early warning light is on and the other warning lights are off, to remind people to reinforce the workpiece 1. When the working state of the workpiece 1 exceeds the strain critical point, the alarm light is on and the other warning lights are off, to warn workers to quickly reinforce or replace the workpiece 1.

[0027] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A strain gauge with an alarm system, characterized in that: include: A vibrating-wire strain gauge (2), the vibrating-wire strain gauge (2) being fixed to the surface of a workpiece (1) via a support (3), a protective cover (4) for protecting the vibrating-wire strain gauge (2) being installed on the side wall of the workpiece (1), a cable (5) extending into the interior of the protective cover (4) and being electrically connected to the vibrating-wire strain gauge (2), and an early warning mechanism (7) being installed on the surface of the protective cover (4); A fixing mechanism (6) is installed at the connection between the cable (5) and the protective cover (4), the fixing mechanism (6) comprising a fixing sleeve (61), the fixing sleeve (61) being installed on the side wall of the protective cover (4), the interior of the fixing sleeve (61) being threadedly connected to a screw sleeve (62), a sealing ring (63) being installed on one end of the screw sleeve (62), a slot (64) being provided on one end of the fixing sleeve (61), the sealing ring (63) being slidably connected to the interior of the slot (64); a plurality of fixing rings (65) are installed on the inner side wall of the sealing ring (63), and the fixing rings (65) are in contact with the side wall of the cable (5).

2. The strain gauge with alarm system according to claim 1, characterized in that: The support (3) comprises a lower base (31), the lower base (31) is welded to the surface of the workpiece (1), the lower base (31) is connected to an upper base (32) via bolts (33), and the vibrating wire strain gauge (2) is installed between the lower base (31) and the upper base (32).

3. The strain gauge with alarm system according to claim 2, characterized in that: The protective cover (4) comprises a shell (41), the shell (41) is mounted on the surface of the workpiece (1), a rubber pad (43) is mounted on the bottom surface of the shell (41), and the rubber pad (43) contacts the surface of the workpiece (1); a fixing block (44) is symmetrically fixedly connected to the side wall of the lower base (31), the fixing block (44) is threadedly connected to the screw rod (42), and the screw rod (42) contacts the side wall of the shell (41).

4. The strain gauge with an alarm system according to claim 3, characterized in that: The side wall cross-section of the rubber pad (43) is funnel-shaped, and the bottom surface of the rubber pad (43) is a wavy structure.

5. The strain gauge with an alarm system according to claim 3, characterized in that: The early warning mechanism (7) comprises a mounting plate (71), the mounting plate (71) being mounted on the top surface of the housing (41), a plurality of warning lights (72) being mounted on the surface of the mounting plate (71), and the warning lights (72) being electrically connected to the cable (5).

6. The strain gauge with an alarm system according to claim 1, characterized in that: The interior of the card slot (64) is in the shape of a hollow truncated cone, and the cable (5) passes through the card slot (64).

7. The strain gauge with an alarm system according to claim 1, characterized in that: The side wall cross section of the sealing ring (63) is in a "T"-shaped structure, and the side wall cross section of the fixing ring (65) is in an arc-shaped structure.

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