Track span measuring tool

Abstract

The invention relates to the field of measurement, in particular to a track span measuring tool. The measuring tool comprises a zero-position support used for being placed on the outer side of a far side rail, the zero-position support is provided with a zero-position fixing structure used for fixing the zero-position end of a measuring tape body, and the zero-position support is provided with a movable adjusting piece used for abutting against the outer side of the far side rail. The zero-position support is pulled by component force in the track direction of the pull force of the tape towards the near side, the zero-position support moves to the position closest to the tape shell by moving the adjusting piece along the outer side of the far-side track, in the state, a tape body of the steel tape is perpendicular to the track center line, whether the tape body of the steel tape is perpendicular to the track center line or not is not observed by human eyes, manual deviation is not prone to occurring, and the accuracy of measurement is improved. The measurement result is accurate.

Description

Technical Field

[0001] This invention relates to the field of measurement, and more particularly to a tooling for measuring track span. Background Technology

[0002] When a track-mounted wheeled vehicle moves along a track, the wheels on both sides are supported on two tracks respectively. To ensure smooth operation, the span between the two tracks (the distance between their center lines) must be equal to the wheelbase between the wheels on both sides of the vehicle (allowing for some deviation). After the tracks are installed, a measuring fixture is needed to measure the span between the center lines of the two tracks to check if it exceeds the deviation range. Existing measuring fixtures include a steel tape measure and a zero-position bracket. A pressure block is hinged to the top of the zero-position bracket, and the zero-position end of the steel tape measure is pressed and fixed to the zero-position bracket by the pressure block. The measurement process using measuring fixtures is as follows: The first operator stands outside the near rail with the steel tape measure casing. The second operator moves the zero-position bracket towards the far rail to unwind the steel tape measure until the zero end of the tape measure crosses the far rail. The zero-position bracket is then placed outside the far rail, at which point the steel tape measure spans both the near and far rails. The first operator then locks the steel tape measure to prevent further length changes. A force gauge is mounted on the steel tape measure, and the first operator pulls the force gauge outward to apply a standard tension (the tension value is an industry standard value; depending on the rail span, the tension value can be 49~147 N) to ensure the steel tape measure is straight and does not sag. The third operator reads the measurement values ​​corresponding to the center lines of the two rails. Subtracting the far rail center line value from the near rail center line value gives the span between the two rails. This process is repeated until the span measurement of the entire rail is completed. During the measurement process, the steel tape measure must be perpendicular to the center line of the track to ensure the accuracy of the measurement results. The existing measurement method relies on manually pulling the steel tape measure to measure the track span. Whether the steel tape measure is perpendicular to the center line of the track depends on human observation, which is prone to deviation and leads to inaccurate measurement results. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a track span measuring fixture that does not rely on human visual observation to determine whether the steel tape measure is perpendicular to the track centerline, thus reducing the likelihood of human error and ensuring accurate measurement results.

[0004] To solve the above problems, the present invention provides a track span measuring fixture, including a zero-position bracket for placement on the outer side of the far rail. The zero-position bracket has a zero-position fixing structure for fixing the zero end of the measuring tape body. The zero-position bracket has a movable adjustment member for pressing against the outer side of the far rail. When the zero-position bracket is pulled by the track direction component of the pulling force of the measuring tape toward the near side, it moves along the outer side of the far rail by the movable adjustment member to move to the position closest to the measuring tape body. Furthermore, the movable adjusting member is specifically a roller, and the movement of the movable adjusting member along the outer side of the distal rail specifically means that the roller rolls along the outer side of the distal rail.

[0005] Furthermore, a force gauge is provided for placement on the outside of the near-side rail. The force gauge applies an outward pulling force to the measuring tape, straightening the tape body and thus applying the near-side pulling force to the zero-position bracket.

[0006] Furthermore, it includes a positioning bracket for placement on the outside of the near-side rail, the top of the positioning bracket having a groove along the track span direction, the force gauge being slidably installed in the groove, and a driving device driving the force gauge to slide outward along the groove to achieve the outward pulling of the measuring tape.

[0007] Furthermore, the positioning bracket includes a lifting bracket supported on the ground and a mounting positioning frame installed inside the lifting bracket. The slide groove is specifically opened on the mounting positioning frame. The driving device is specifically a handwheel installed on the outside of the positioning bracket. A lead screw is inserted through the slide groove. The end of the lead screw away from the near rail serves as the starting end, extends to the outside of the supporting frame and is fixed together with the handwheel. The end of the lead screw near the near rail serves as the ending end and is accommodated in the slide groove. The lower part of the force gauge is threaded onto the lead screw. The handwheel drives the lead screw to rotate, causing the force gauge to slide outward along the slide groove.

[0008] Furthermore, the positioning bracket extends inward to have a proximal mounting portion for resting on the top surface of the near rail; the zero-position bracket extends inward to have a distal mounting portion for resting on the top surface of the far rail.

[0009] Furthermore, the middle of the near-side overlap section is left open for the tape measure body to pass through, and the middle of the far-side overlap section is also left open for the tape measure body to pass through; a magnifying glass is provided to facilitate reading the tape measure body placed in the middle of the near-side overlap section and / or placed in the middle of the far-side overlap section.

[0010] Furthermore, a tape measure bracket for mounting a tape measure is slidably installed in the slide groove. The tape measure is pulled outward by the force gauge, causing the tape measure bracket to slide outward along the slide groove.

[0011] Furthermore, this includes the aforementioned measuring tape.

[0012] Furthermore, the zero end of the measuring tape body is provided with a mounting ring; the zero-position fixing structure includes a screw and a mounting groove at the bottom of the zero-position bracket, with a screw hole at the bottom of the mounting groove, and the screw passes through the mounting ring and is screwed into the screw hole for fixing.

[0013] Beneficial effects: The first operator places the measuring tape casing on the outside of the near rail, and the second operator places the zero-position bracket on the outside of the far rail. The adjusting mechanism on the zero-position bracket rests against the outside of the far rail, and the measuring tape spans both rails. The first operator locks the measuring tape to prevent its length from changing, then pulls it outward to keep it taut. The taut tape exerts a pulling force on the zero-position bracket towards the near side. If the measuring tape is not perpendicular to the rail, the pulling force it exerts on the zero-position bracket will have a component in the rail direction. Under this component, the zero-position bracket moves along the outside of the far rail using the adjusting mechanism to reach the position closest to the measuring tape casing. In this state, the measuring tape is perpendicular to the rail centerline, allowing the readings corresponding to the centerlines of the two rails to be taken, thus determining the span between the two rails. During the measurement process, whether the measuring tape is perpendicular to the rail centerline does not rely on visual observation, reducing the likelihood of human error and ensuring accurate measurement results. Attached Figure Description

[0014] Figure 1 This is a simplified structural diagram of the track span measurement fixture.

[0015] Figure 2 This is a half-section view of the track span measuring fixture.

[0016] Figure 3 yes Figure 2 A simplified, enlarged view of a portion of point A in the diagram.

[0017] Figure 4 This is a simplified upward view of the zero-position support.

[0018] Figure 5 This is a simplified schematic diagram showing the structure where the ruler is not perpendicular to the center line of the track during the measurement process.

[0019] Figure 6 This is a side view of the positioning bracket, showing the sliding foot of the first magnifying glass.

[0020] Figure 7 This is a simplified bottom view of another embodiment of the zero-position support.

[0021] Symbol explanation: 1-Positioning bracket; 2-Zero-position bracket; 3-Rail; 4-Magnifying glass; 6-Steel tape measure; 7-Force gauge; 8-Handwheel; 11-Support positioning frame; 12-Leveling base; 13-Mounting positioning frame; 14-Tap measure bracket; 15-Force gauge bracket; 16-Near side placement part; 17-Retractable support leg; 21-Far side placement part; 22-First handle; 23-Roller; 31-Near side rail; 32-Far side rail; 41-First magnifying glass; 42-Second magnifying glass; 43-Sliding support leg; 51-Mounting groove; 52-Screw; 61-Scale body; 62-Scale body zero-position end; 63-Scale shell; 64-Mounting ring; 65-Hanging ring; 71-Hook; 81-Second handle; 82-Lead screw. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] Track span measurement fixtures such as Figure 1 As shown, it includes a positioning bracket 1 placed on the outside of the near side rail 31 and a zero-position bracket 2 placed on the outside of the far side rail 32. A steel tape measure 6 (or a tape measure of other materials can be used) is installed on the positioning bracket 1, and the zero-position end 62 of the steel tape measure 61 is fixed on the zero-position bracket 2.

[0024] The positioning bracket 1 includes a supporting positioning frame 11, the bottom of which is connected to a leveling base 12 via a retractable support leg 17 (the leveling base 12 can be a commonly available model such as DY-60N or LP-64). A mounting positioning frame 13 is detachably installed inside the supporting positioning frame 11, and the top of the mounting positioning frame 13 has a groove 131 along the span direction of the track 3. Figure 2 A lead screw 82 is threaded through the slide groove 131. The end of the lead screw 82 furthest from the near rail 31 serves as the starting end, extending to the outside of the support frame 11 and fixed with a handwheel 8; the end of the lead screw 82 closest to the near rail 31 serves as the ending end, housed in the slide groove 131. A measuring tape bracket 14 is slidably installed in the slide groove 131, and the measuring tape bracket 14 does not contact the lead screw 82. The steel measuring tape 6 housing 63 is installed on the upper part of the measuring tape bracket 14. The outlet of the steel measuring tape 6 housing 63 (not shown in the attached figure) is flush with the top surface of the mounting frame 13, so the steel measuring tape 6 body 61 is flush with the top surface of the mounting frame 13 after being pulled out from the outlet. A force gauge bracket 15 (see figure) is threadedly connected to the outside of the steel measuring tape 6 via the lead screw 82. Figure 3 A measuring instrument 7 is fixedly mounted on the inner side of the upper part of the measuring instrument bracket 15. A hanging ring 65 is provided on the outer side of the steel tape measure 6's housing 63, which is used to mount the measuring instrument 7 on the hook 71. The handwheel 8 serves as a driving device, and its operation rotates the lead screw 82 to rotate, causing the measuring instrument bracket 15 and the measuring instrument 7 to slide outward along the slide groove 131, pulling the steel tape measure 6's housing 63 and the tape measure bracket 14 to slide outward along the slide groove 131.

[0025] The mounting positioning bracket 13 has a near-side mounting section 16 extending inward from its top surface, with a gap in the middle; the zero-position bracket 2 has a far-side mounting section 21 extending inward from its top surface, with a gap in the middle. (See zero-position bracket 2 for details.) Figure 4 The bottom center has a mounting groove 51, and the middle gap of the far side overlapping part 21 is aligned with the mounting groove 51. The mounting groove 51, the middle gap of the far side overlapping part 21 and the steel tape measure 6 body 61 are of the same width. The bottom center of the mounting groove 51 has a screw hole (not shown in the attached figure), and a screw 52 is installed in the screw hole. The zero end 62 of the steel tape measure 61 is equipped with a mounting ring 64. After the zero end 62 of the steel tape measure 61 is pulled out from the casing 63, it passes through the middle gap of the near-side overlap 16 and the middle gap of the far-side overlap 21 in sequence, and then enters the mounting groove 51 until the mounting ring 64 is aligned with the screw hole at the bottom of the mounting groove 51. The screw 52 passes through the mounting ring 64 and is screwed into the threaded hole to clamp the mounting ring 64 between its nut and the groove opening of the mounting groove 51. The screw 52 and the mounting groove 51 together form a zero-position fixing structure, clamping and fixing the zero end 62 of the steel tape measure 61 to the zero-position bracket 2. Alternatively, the zero end 62 of the steel tape measure 61 can be without a mounting ring and instead, as described in the background art, be directly pressed and fixed to the zero-position bracket by a pressure block hinged to the top of the zero-position bracket.

[0026] Using this measuring fixture to measure the span of track 3, the first operator places the positioning bracket 1 on the outside of the near-side rail 31, so that the inner side of the mounting positioning bracket 13 rests against the outer side of the near-side rail 31. Figure 1 As shown, the retractable support leg 17 at the bottom of the support positioning frame 11 is then adjusted to raise and lower the bottom surface of the near-side placement part 16 until it is flush with the top surface of the near-side rail 31. If the ground outside the near-side rail 31 is uneven, causing the bottom surface of the near-side placement part 16 to not be flush with the top surface of the near-side rail 31, the first operator will need to adjust the leveling base 12. The second operator holds the first handle 22 on the outside of the zero-position bracket 2 and places the zero-position bracket 2 on the outside of the far-side rail 32. The two rollers 23 at the bottom of the zero-position bracket 2 then press inward against the outside of the far-side rail 32, and the far-side placement part 21 rests on the top surface of the far-side rail 32. At this point, the steel tape measure 6 body 61 spans the two rails 3, the near-side rail 31 and the far-side rail 32.

[0027] The first operator locks the steel measuring tape 6 so that the exposed length of the tape measure 6 body 61 no longer changes (this is a common function of steel measuring tapes). Then, holding the second handle 81 on the outside of the handwheel 8, the operator rotates the handwheel 8. The handwheel 8 drives the lead screw 82 to rotate, causing the force gauge bracket 15, along with the force gauge 7, to slide outward along the slide groove 131. The force gauge 7, sliding outward along the slide groove 131, pulls the steel measuring tape 6 body 63 outward along the slide groove 131 until the force gauge 7 displays a pulling force reaching the standard value (e.g., 50N). In this state, the steel measuring tape 6 body 61 is straightened under the outward pulling force applied by the force gauge 7. The second operator can then release the first handle 22 of the zero-position bracket 2. See Figure 5 The steel tape measure 6 body 61 applies a pulling force F along the near side of the zero support 2. If the steel tape measure 6 body 61 is not perpendicular to the track 3, the pulling force F applied to the zero support 2 will have a component force F' along the track 3. Since the zero support 2 is pushed against the outside of the far track 32 by the roller 23, it moves to the position closest to the steel tape measure 6 body 63 by rolling along the outside of the far track 32 under the action of this component force F'. In this state, the steel tape measure 6 body 61 is perpendicular to the center line of the track, and the values ​​corresponding to the center lines of the two tracks can be read. (After the zero support 2 moves to the position closest to the steel tape measure 6 body 63 by rolling along the outside of the far track 32 by the roller 23, if the pulling force displayed by the force gauge 7 changes, the operator should operate the handwheel 8 again before reading the value so that the force gauge 7 displays the pulling force to the standard value again.)

[0028] See Figure 1 Both the near-side stacking section 16 and the far-side stacking section 21 are equipped with magnifying glasses 4 of the same specifications to facilitate reading by the operator. The magnifying glasses 4 are the same width as the central gap in the near-side stacking section 16. The first operator places the first magnifying glass 41 in the central gap of the near-side stacking section 16, first aligning it with the inside of the near-side rail 31, and reads the corresponding value 'a' on the ruler 61. Then, the operator aligns it with the outside of the near-side rail 31 and reads the corresponding value 'b' on the ruler 61. The average value of value 'a' and value 'b' is then used to obtain the value corresponding to the center line of the near-side rail 31. The magnifying glasses 4 are wider than the central gap in the far-side stacking section 21 and can be placed directly on the far-side stacking section 21. Because the zero end 62 of the steel measuring tape 61 is fixed to the zero bracket 2, and the zero mark of the zero end 62 is aligned with the inner side of the roller 23 (i.e., the zero mark is aligned with the outer side of the far rail 32), the second operator only needs to place the second magnifying glass 42 on the far side support 21, align it with the inner side of the far rail 32, read the value c corresponding to the inner side of the far rail 32, and then take half of the value to obtain the value of the center line of the far rail 32. Subtracting the value of the center line of the far rail 32 from the value corresponding to the center line of the near rail 31 gives the span between the two rails 3, the near rail 31 and the far rail 32.

[0029] The two magnifying glasses 41 and 42 are identical in specifications and are not fixed on the stacking parts 16 and 21, so only one operator needs to take the readings.

[0030] See another embodiment. Figure 6 , 7 Two sliding feet 43 can be added to the bottom of the magnifying glasses 41 and 42. The two sliding feet 43 at the bottom of the first magnifying glass 41 rest on the two side walls of the open space in the middle of the near side of the stacking part 16, and the two sliding feet 43 at the bottom of the second magnifying glass 42 rest on the two radial outer side walls of the far side of the stacking part 21. The operator can push the magnifying glasses 41 and 42 to slide them along the stacking parts 16 and 21 to the point on the ruler 61 where the reading is required.

[0031] The roller 23 at the bottom of the positioning bracket 1 can be replaced with a slider (not shown in the attached figure), and the steel tape measure can be replaced with a tape measure with higher material strength (such as a carbon fiber tape measure). The zero-position bracket 2 is pulled by the component of the force of the measuring tape pulling towards the near side along the track 3. It moves to the point closest to the measuring tape shell by sliding the slider along the outer side of the far side track 32. Compared with the roller 23 rolling along the outer side of the far side track 32, it needs to overcome greater frictional resistance. Therefore, after the first operator locks the measuring tape so that the exposed length of the measuring tape body no longer changes, it is necessary to operate the handwheel 8 to make the force gauge 7 apply sufficient outward pulling force (greater than the standard value) to the measuring tape, thereby applying sufficient near-side pulling force to the zero-position bracket 2. Until the slider can overcome the frictional resistance and slide along the outer side of the far side track 32 under the pull of the component of the force of the near-side pulling force along the track 3. After the zero-position bracket 2 slides to the point closest to the measuring tape shell by sliding the slider, the first operator operates the handwheel 8 again to make the force gauge 7 display the standard value. Then, the value corresponding to the center line of the two tracks 3 can be read to calculate the track span.

[0032] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A track span measuring fixture, comprising a zero-position bracket (2) for placement on the outside of the distal rail (32), the zero-position bracket (2) having a zero-position fixing structure for fixing the zero end (62) of the measuring tape (6) body (121), characterized in that: The zero-position bracket (2) has a movable adjustment member for pressing against the outside of the far rail (31). The zero-position bracket (2) is pulled by the component of the force of the measuring tape (6) towards the near side of the track (3), and moves to the position closest to the measuring tape (6) shell (63) by moving the movable adjustment member along the outside of the far rail (32).

2. The track span measuring fixture as described in claim 1, characterized in that: The movable adjustment component is specifically a roller (23), and the movement of the movable adjustment component along the outer side of the far side rail (32) specifically means that the roller (23) rolls along the outer side of the far side rail (32).

3. The track span measuring fixture as described in claim 2, characterized in that: A force gauge (7) is provided for placement on the outside of the near side rail (31). The force gauge (7) applies an outward pulling force to the measuring tape (6) to straighten the body (61) of the measuring tape (6), thereby applying the said near-side pulling force to the zero position bracket (2).

4. The track span measuring fixture as described in claim 3, characterized in that: It includes a positioning bracket (1) for placement on the outside of the rail (31) near the side. The top of the positioning bracket (1) has a groove (131) along the span direction of the rail (3). The force gauge (7) is slidably installed in the groove (131). A driving device is provided to drive the force gauge (7) to slide outward along the groove (131) to realize the outward pulling of the measuring tape (6).

5. The track span measuring fixture as described in claim 4, characterized in that: The positioning bracket (1) includes a lifting bracket (11) supported on the ground and an installation positioning frame (13) installed inside the lifting bracket (11). The slide groove (131) is specifically opened on the installation positioning frame (13). The driving device is specifically a handwheel (8) installed on the outside of the positioning bracket (1). A lead screw (82) is inserted in the slide groove (131). The end of the lead screw (82) away from the near rail (31) serves as the starting end, extends to the outside of the support bracket (11) and is fixed together with the handwheel (8). The end of the lead screw (82) near the near rail (31) serves as the ending end and is accommodated in the slide groove (131). The lower threaded part of the force gauge (7) is fitted onto the lead screw (82), and the handwheel (8) drives the lead screw (82) to rotate so that the force gauge (7) slides outward along the slide groove (131).

6. The track span measuring fixture as described in claim 4, characterized in that: The positioning bracket (1) extends inward to have a near-side mounting part (16) for mounting on the top surface of the near-side rail (31); the zero-position bracket (2) extends inward to have a far-side mounting part (21) for mounting on the top surface of the far-side rail (32).

7. The track span measuring fixture as described in claim 6, characterized in that: The middle of the near side draping section (16) is left open for the tape measure (6) body (61) to pass through, and the middle of the far side draping section (21) is left open for the tape measure (6) body (61) to pass through; a magnifying glass (4) is provided to facilitate reading the tape measure (61) placed in the middle open space of the near side draping section (16) and / or placed in the middle open space of the far side draping section (21).

8. The track span measuring fixture as described in claim 4, characterized in that: A tape measure bracket (14) for mounting a tape measure (6) is slidably installed in the slide groove (131). The tape measure (6) is pulled outward by the force gauge (7), causing the tape measure bracket (14) to slide outward along the slide groove (131).

9. The track span measuring fixture as described in any one of claims 1 to 8, characterized in that: Including the aforementioned measuring tape (6).

10. The track span measuring fixture as described in claim 9, characterized in that: The measuring tape (6) has a mounting ring (64) at the zero end (62) of the tape body (61); the zero fixing structure includes a screw (52) and a mounting groove (51) at the bottom of the zero bracket (2). The mounting groove (51) has a screw hole at the bottom, and the screw (52) passes through the mounting ring (64) and is screwed into the screw hole.

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