Measuring tool for measuring clearance convergence

Abstract

The utility model provides a measuring tool for measuring clearance convergence, which relates to the technical field of clearance convergence measurement and comprises a ruler frame, a steel tape with a hole, a tension head, a bidirectional self-locking winch, a driving mechanism and a vernier caliper, the tension head is connected with the ruler frame through a tension spring, and the bidirectional self-locking winch is driven by the driving mechanism. An auxiliary caliper of the vernier caliper is connected with the bidirectional self-locking winch through a steel wire rope; according to the utility model, a hole-containing steel tape part of a convergence instrument in the prior art is combined and assembled with the vernier caliper, and the reading precision and the measuring range of the vernier caliper are utilized to ensure the measuring precision and increase the adjusting measuring range, so that the position of a positioning hole on the hole-containing steel tape can have more choices when the same length is measured; the problem that when the same length is measured, the use frequency of the same positioning hole in the steel tape with the hole is too high, and consequently a fixing hole in the steel tape with the hole is prone to being damaged is solved, a battery does not need to be installed on the tool, and the tool has the advantages of being high in environment adaptability, small in dead weight, large in measuring range and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of clearance convergence measurement, in particular to a measuring tool for measuring clearance convergence. Background Art

[0002] The working principle of the convergence meter is mainly based on the method of mechanical transmission of displacement. It measures by converting the relative displacement between two reference points into the difference between two readings of the digital displacement meter. Specifically, when the two reference points are connected by hooks, the length of the convergence meter body can be changed by adjusting the adjustment nut, thereby generating a constant tension on the steel ruler to ensure the accuracy and comparability of the measurement.

[0003] In large-scale projects such as tunnels, dams, mines, and subways, it is necessary to monitor the stress and deformation of the equipment during the construction and operation phases with high precision (i.e., to observe the changes of a relatively fixed length periodically within a time range). Conventional convergence instruments are JSS20A and JSS30A digital display convergence instruments, which are made of stainless steel. The reading method is the reading of the steel tape positioning hole + electronic digital display reading (built-in telescopic sensor), with a reading accuracy of 0.01mm and a measurement accuracy of about 0.06mm. The disadvantages of the convergence instrument are as follows: ① The instrument has a large deadweight (about 1300g), and a greater pulling force is required to ensure the straightness of the ruler during long-distance measurement, which can easily cause damage to the positioning holes of the steel tape measure; ② The fine-tuning telescopic adjustment range is small (about 50mm), so the main ruler positioning holes will be used repeatedly at the same measurement position, which can also easily damage the steel tape measure positioning holes (hole spacing 25mm); ③ The digital display part needs to remove the outer shell to replace the battery, which can easily lead to poor airtightness, and moisture or water ingress can easily damage the electronic components and prevent them from working properly; ④ The main steel ruler is too long. The commonly used measurement length in many projects is 3 to 10 meters (such as subway tunnel construction). The commonly used main steel ruler of digital display convergence instruments is 20 meters or 30 meters. Most of them are not effectively used in actual applications, but instead increase the deadweight of the equipment, resulting in damage to the commonly used positioning holes. Therefore, the utility model proposes a measuring tool for measuring clearance convergence to solve the deficiencies in the prior art. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a measuring tool for measuring clearance convergence, by combining and assembling the perforated steel tape measure part of the convergence meter in the prior art with the vernier caliper, and the bidirectional self-locking winch winding wire rope is used to drive the secondary scale of the vernier caliper to move on the main scale. The tool uses the reading accuracy and range of the vernier caliper to ensure the measurement accuracy while increasing the adjustment range, so that there are more options for the position of the locating holes on the perforated steel tape measure when measuring the same length, avoiding the problem of the fixed holes on the perforated steel tape measure being easily damaged due to the frequency of using the same locating holes on the perforated steel tape measure too often when measuring the same length. The tool does not need to install batteries and has the advantages of strong environmental adaptability, light weight, large range and easy operation.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A measuring tool for measuring clearance convergence comprises a ruler frame, a steel tape measure with a hole, a tension head, a two-way self-locking capstan, a driving mechanism and a vernier caliper, wherein a tape measure roller is rotatably installed inside one end of the ruler frame, a steel tape measure with a hole is wound and installed on the tape measure roller, one end of the steel tape measure with a hole is provided with a ruler head hook, one end of the ruler frame is movably provided with a tension head, the tension head is connected to the ruler frame through a tension spring, a vernier caliper is detachably installed on the ruler frame away from one end of the tension head, a two-way self-locking capstan is provided inside the ruler frame near one end of the vernier caliper through a rotating shaft, and a driving mechanism is provided inside the ruler frame, the two-way self-locking capstan is driven by the driving mechanism, a secondary ruler of the vernier caliper is connected to the two-way self-locking capstan through a steel wire rope, a rotating hook is slidably provided at one end of the vernier caliper, a drawing groove is provided on the rear side wall of the main ruler of the vernier caliper, a connecting rod is movably provided in the drawing groove, one end of the connecting rod is connected to the inner side wall of the secondary ruler, and the other end of the connecting rod is connected to the rotating hook;

[0007] The driving mechanism includes a worm wheel, a worm and a driving handle. The worm wheel is installed on a rotating shaft. A worm is rotatably provided inside a ruler frame on one side of the worm wheel. The worm is meshed with the worm wheel. The upper end of the worm extends out of the top of the ruler frame and is provided with a driving handle.

[0008] A further improvement is that the pulling head includes a movable pulling block, a ruler clamp and a ruler hole pin, the hollow part at one end of the movable pulling block is located inside one end of the ruler frame, one end of the pulling spring is located inside the hollow part at one end of the movable pulling block, and one end of the pulling spring is connected to the hollow part at one end of the movable pulling block through a first spring fixing pin, and the other end of the pulling spring is connected to the inside of one end of the ruler frame through a second spring fixing pin.

[0009] A further improvement is that one end of the main ruler is detachably mounted to one end of the ruler frame by means of bolts, and the auxiliary ruler is slidably mounted on the main ruler.

[0010] A further improvement is that a movable pulley is provided on one side of the top of the secondary ruler, a rope hook is provided at one end of the ruler frame, one end of the steel wire rope is wound around a two-way self-locking winch, and the other end of the steel wire rope passes through the movable pulley and is detachably connected to the rope hook.

[0011] A further improvement is that a tension display window is provided on the top of the ruler frame above the tension spring, and a ruler handle is installed on the shaft at one end of the measuring tape roller on one side of the ruler frame.

[0012] A further improvement is that a through slot is provided at the top of one end of the ruler frame, and the through slot extends from the upper end of the bidirectional self-locking winch.

[0013] The beneficial effects of the utility model are as follows: the utility model combines and assembles the steel tape measure with a hole of the convergence instrument in the prior art with the vernier caliper, and arranges a driving mechanism inside the scale frame to drive the two-way self-locking capstan to rotate. The two-way self-locking capstan winds up the wire rope to drive the secondary scale of the vernier caliper to move on the main scale. During the movement of the secondary scale, the rotating hook slidably connected to the main scale is driven to move toward the side of the tension head, so as to maintain the entire measuring tool in a stable tensioned state. The tool utilizes the reading accuracy and range of the vernier caliper to ensure the measurement accuracy while increasing the adjustment range. After the range is increased, the measuring tool can have more choices for the position of the positioning hole on the steel tape measure with a hole 2 when measuring the same length. It not only effectively ensures the accuracy of the measurement, but also avoids the problem that the fixing hole on the steel tape measure with a hole is easily damaged due to the too high frequency of use of the same positioning hole on the steel tape measure with a hole 2 when the convergence instrument measures the same length in the prior art, thereby increasing the service life of the tool.

[0014] Compared with the traditional convergence meter, the tool for measuring clearance convergence of the utility model does not need to install batteries, has the advantages of strong environmental adaptability, small deadweight, large measuring range and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 It is a partial enlarged schematic diagram of the installation structure of the driving mechanism of the utility model;

[0017] Figure 3 It is a partial enlarged schematic diagram of the installation structure of the tension head of the utility model;

[0018] Figure 4 This is a schematic diagram of the installation structure of the rotary hook of the utility model.

[0019] Among them: 1. Ruler frame; 2. Steel tape measure with holes; 3. Tension head; 301. Movable tension block; 302. Ruler clamp; 303. Ruler hole pin; 304. First spring fixing pin; 305. Second spring fixing pin; 4. Two-way self-locking capstan; 5. Vernier caliper; 501. Main ruler; 502. Auxiliary ruler; 6. Ruler head hook; 7. Rotating shaft; 8. Steel wire rope; 9. Rotating hook; 10. Pull groove; 11. Connecting rod; 12. Worm gear; 13. Worm; 14. Driving handle; 15. Tension spring; 16. Bolt; 17. Movable pulley; 18. Rope hook; 19. Tension display window; 20. Ruler handle. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with an embodiment. The embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0021] according to Figure 1-4 As shown, this embodiment proposes a measuring tool for measuring clearance convergence, including a ruler frame 1, a steel tape measure with holes 2, a tension head 3, a two-way self-locking winch 4, a driving mechanism and a vernier caliper 5. A tape measure roller is rotatably installed inside one end of the ruler frame 1, and a steel tape measure 2 with holes is wound around the tape measure roller. In the utility model. The length of the steel tape measure with holes 2 can be configured with a small span of 5m, 10m, 15m, and 20m according to the engineering characteristics, so as to avoid the influence of the deadweight of the steel tape measure with holes 2. The measuring range of the vernier caliper 5 can also be configured with a length of 5cm, 10cm or even 15cm, and the steel wire rope 8 can also be adaptively replaced; one end of the steel tape measure with holes 2 is provided with a ruler head hook 6, and one end of the ruler frame 1 is movably provided with a tension head 3, and the tension head 3 is connected to the ruler frame 1 through a tension spring 15. The positioning holes on the steel tape measure with holes 2 of the utility model maintain the original size, and the spacing remains unchanged (25mm); the structure of the tension head 3 remains unchanged, and the tension head 3 is connected to the ruler frame 1 with a tension spring 15, so that the steel tape measure with holes 2 and the ruler hole pin are fixed together. 303 is closer, and it is more convenient to retract and release the ruler. A vernier caliper 5 is detachably installed on the ruler frame 1 at one end away from the tension head 3. A two-way self-locking capstan 4 is provided inside the ruler frame 1 near one end of the vernier caliper 5 through a rotating shaft 7, and a driving mechanism is provided inside the ruler frame 1. The two-way self-locking capstan 4 is driven by the driving mechanism. The secondary ruler 502 of the vernier caliper 5 is connected to the two-way self-locking capstan 4 through a steel wire rope 8. A rotating hook 9 is slidably provided at one end of the vernier caliper 5. A drawing groove 10 is provided on the rear side wall of the main ruler 501 of the vernier caliper 5. A connecting rod 11 is movably provided in the drawing groove 10. One end of the connecting rod 11 is connected to the inner side wall of the secondary ruler 502, and the other end of the connecting rod 11 is connected to the rotating hook 9.

[0022] The driving mechanism includes a worm wheel 12, a worm 13 and a driving handle 14. The worm wheel 12 is installed on the rotating shaft 7. A worm 13 is rotatably provided inside the ruler frame 1 on one side of the worm wheel 12. The worm 13 is meshed with the worm wheel 12, and the upper end of the worm 13 extends out of the top of the ruler frame 1 and is provided with a driving handle 14. Since accurate readings are required under fixed tension, and the fixing holes of the perforated steel tape 2 will be protected when the tension is slowly released, the new measuring instrument adopts a worm to drive the worm wheel for transmission. When the lead angle of the worm is smaller than the equivalent friction angle between the meshing teeth of the worm wheel, the worm wheel and worm structure has self-locking property, that is, only the worm can drive the worm wheel, but the worm wheel cannot drive the worm, thereby realizing a two-way self-locking capstan, and the entire driving mechanism is fixed at the tail end of the ruler frame 1, and the space used is small.

[0023] When the tool of the utility model is used, monitoring rings / hooks are buried at both ends of the observation part, and then the ruler head hook 6 at one end of the perforated steel tape 2 is hooked on one of the monitoring rings / hooks, and then the rotating hook 9 is hooked on the other monitoring ring / hook. At this time, it is ensured that the vernier caliper 5 has an inward stroke space greater than 3 cm, and then the perforated steel tape 2 is pulled as straight as possible, and then the ruler hole pin 303 of the tension head 3 is inserted into the fixed hole on the perforated steel tape 2, and finally the ruler card 302 is pushed in. At this time, the connection of one end of the ruler head hook 6 is completed, and then the driving handle 14 is rotated to make the worm rotate and then drive the rotating shaft 7 equipped with the worm gear to rotate, and after the rotating shaft 7 rotates, it drives the two-way self-locking winch 4 to rotate to reel in the wire rope 8 , and then the secondary scale 502 of the vernier caliper 5 connected to one end of the wire rope 8 moves on the main scale 501 toward the side of the two-way self-locking winch 4, thereby driving the rotating hook 9 connected to the secondary scale 502 to move until the specified tension value is reached (different tension values ​​are locked according to different measuring lengths), so that the rotating hook 9 and the hooked monitoring ring / hook are in a stable tension state. Finally, the readings of the perforated steel tape measure 2 and the vernier caliper 5 are read, and the two are added to obtain the monitoring value, such as: the degree of the fixed hole at the insertion position of the scale hole pin 303 on the perforated steel tape measure 2 is 2.65m, and the vernier caliper reads 4.352cm, then the measured value is 2.65m+0.04352m=2.69352m.

[0024] The tension head 3 includes a movable tension block 301, a ruler clamp 302 and a ruler hole pin 303. The hollow part at one end of the movable tension block 301 is located inside one end of the ruler frame 1. One end of the tension spring 15 is located inside the hollow part at one end of the movable tension block 301. One end of the tension spring 15 is connected to the hollow part at one end of the movable tension block 301 through a first spring fixing pin 304. The other end of the tension spring 15 is connected to the inside of one end of the ruler frame 1 through a second spring fixing pin 305.

[0025] One end of the main ruler 501 is detachably mounted to one end of the ruler frame 1 via a bolt 16 , and the secondary ruler 502 is slidably mounted on the main ruler 501 .

[0026] A movable pulley 17 is provided on one side of the top of the secondary ruler 502, a rope hook 18 is provided at one end of the ruler frame 1, one end of the steel wire rope 8 is wound on the two-way self-locking winch 4, and the other end of the steel wire rope 8 passes through the movable pulley 17 and is detachably connected to the rope hook 18. By adopting the movable pulley 17, the secondary ruler 502 of the vernier caliper 5 moves inward as the pulling force increases, and the movable pulley 17 is provided at the pulling point, which is more labor-saving during operation.

[0027] A tension display window 19 is provided on the top of the ruler frame 1 above the tension spring 15, and a ruler handle 20 is installed on the shaft at one end of the tape measure roller on one side of the ruler frame 1. The tension display window 19 is used to conveniently observe the tension scale on the tension spring 15.

[0028] A through slot is provided at the top of one end of the ruler frame 1, and the through slot extends from the upper end of the bidirectional self-locking capstan 4.

[0029] In the utility model, the ruler frame 1, the vernier caliper 5, the ruler head hook 6, the rotating hook 9, and the ruler handle 20 can be made of aluminum alloy; the tension spring 15, the steel tape measure with holes 2, the worm 13, and the worm wheel 12 are made of rigid material; the steel wire rope 8 is a braided soft steel wire rope with a diameter of 1 mm.

[0030] The utility model combines and assembles the steel tape measure with holes of the convergence instrument in the prior art with the vernier caliper, and arranges a driving mechanism inside the ruler frame 1 to drive the bidirectional self-locking capstan 4 to rotate. The bidirectional self-locking capstan 4 winds up the steel wire rope 8 to drive the sub-scale 502 of the vernier caliper 5 to move on the main scale 501. During the movement of the sub-scale 502, the rotating hook 9 slidably connected with the main scale 501 is driven to move toward the side of the tension head 3, so that the whole measuring tool is maintained in a stable tension state. The tool utilizes the reading accuracy and measuring range of the vernier caliper 5 to ensure the measurement accuracy while The adjustment range is increased. After the range is increased, the measuring tool can have more options for the position of the positioning hole on the perforated steel tape 2 when measuring the same length, which not only effectively ensures the accuracy of the measurement, but also avoids the problem of the fixed hole on the perforated steel tape 2 being easily damaged due to the too high frequency of use of the same positioning hole on the perforated steel tape 2 when the convergence meter measures the same length in the prior art, thereby improving the service life of the tool. Compared with the traditional convergence meter, the measuring tool for measuring clearance convergence of the utility model does not need to install batteries, has the advantages of strong environmental adaptability, light weight, large range and convenient operation.

[0031] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A measuring tool for measuring clearance convergence, characterized in that: The invention comprises a ruler frame (1), a steel tape measure with a hole (2), a tension head (3), a bidirectional self-locking winch (4), a driving mechanism and a vernier caliper (5); a measuring tape roller is rotatably mounted inside one end of the ruler frame (1), a steel tape measure with a hole (2) is wound around the measuring tape roller, a ruler head hook (6) is provided at one end of the steel tape measure with a hole (2), a tension head (3) is movably mounted at one end of the ruler frame (1), the tension head (3) is connected to the ruler frame (1) via a tension spring (15), a vernier caliper (5) is detachably mounted on the ruler frame (1) at one end away from the tension head (3), and a vernier caliper (5) is detachably mounted inside the ruler frame (1) at one end close to the vernier caliper (5). A bidirectional self-locking winch (4) is arranged on the rotating shaft (7), and a driving mechanism is arranged inside the ruler frame (1). The bidirectional self-locking winch (4) is driven by the driving mechanism. The secondary scale (502) of the vernier caliper (5) is connected to the bidirectional self-locking winch (4) through a steel wire rope (8). A rotating hook (9) is slidably arranged on one end of the vernier caliper (5). A drawing groove (10) is arranged on the rear side wall of the main scale (501) of the vernier caliper (5). A connecting rod (11) is movably arranged in the drawing groove (10). One end of the connecting rod (11) is connected to the inner side wall of the secondary scale (502), and the other end of the connecting rod (11) is connected to the rotating hook (9). The driving mechanism comprises a worm wheel (12), a worm (13) and a driving handle (14); the worm wheel (12) is mounted on a rotating shaft (7); a worm (13) is rotatably arranged inside a ruler frame (1) on one side of the worm wheel (12); the worm (13) is meshed with the worm wheel (12); and the upper end of the worm (13) extends out of the top of the ruler frame (1) and is provided with a driving handle (14).

2. A measurement tool for measuring clearance convergence according to claim 1, characterized in that: The tension head (3) comprises a movable tension block (301), a ruler clamp (302) and a ruler hole pin (303); the hollow portion at one end of the movable tension block (301) is located inside one end of the ruler frame (1); one end of the tension spring (15) is located inside the hollow portion at one end of the movable tension block (301); one end of the tension spring (15) is connected to the hollow portion at one end of the movable tension block (301) via a first spring fixing pin (304); the other end of the tension spring (15) is connected to the inside of one end of the ruler frame (1) via a second spring fixing pin (305).

3. A measurement tool for measuring clearance convergence according to claim 1, characterized in that: One end of the main ruler (501) is detachably mounted to one end of the ruler frame (1) via a bolt (16), and the secondary ruler (502) is slidably mounted on the main ruler (501).

4. A measurement tool for measuring clearance convergence according to claim 3, characterized in that: A movable pulley (17) is provided on one side of the top of the secondary ruler (502), a rope hook (18) is provided at one end of the ruler frame (1), one end of the steel wire rope (8) is wound around a bidirectional self-locking winch (4), and the other end of the steel wire rope (8) passes through the movable pulley (17) and is detachably connected to the rope hook (18).

5. A measurement tool for measuring clearance convergence according to claim 1, characterized in that: A tension display window (19) is provided on the top of the ruler frame (1) above the tension spring (15), and a ruler handle (20) is installed on the shaft at one end of the measuring tape roller on one side of the ruler frame (1).

6. A measurement tool for measuring clearance convergence according to claim 1, characterized in that: A through slot is provided at the top of one end of the ruler frame (1), and the through slot extends from the upper end of the bidirectional self-locking winch (4).

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