Uniform tensioning device for grating ruler

Abstract

The invention relates to the technical field of precision measuring instruments, in particular to a uniform tensioning device for a grating ruler. Comprising a fixed seat, the fixed seat is provided with a through hole, a bolt is rotatably connected in the through hole of the fixed seat, the bolt is provided with a cylindrical cavity, the bolt is in threaded connection with a threaded sleeve, the threaded sleeve is rotatably connected with a rotating column, and the rotating column of the threaded sleeve is fixedly connected with a connecting block. The connecting block is detachably connected with symmetrical tension springs, the symmetrical tension springs are jointly detachably connected with a positioning sliding block, the positioning sliding block is provided with a hook and an elastic supporting piece, one side of the positioning sliding block is slidably connected with an extrusion plate in a limiting mode, and the extrusion plate is provided with a threaded hole; and fastening screws are in threaded connection with the interiors of the threaded holes of the extrusion plates. According to the invention, by changing the swing angle of the connecting block, the two tension springs present the same tension, so that the accuracy between the steel ruler belt and the reading probe is improved.

Description

Technical Field

[0001] The invention relates to the technical field of precision measuring instruments, and in particular to a grating ruler uniform tensioning device. Background Art

[0002] Grating ruler, also known as grating ruler displacement sensor, is a measurement feedback device that works based on the optical principle of grating. It is mainly used to measure linear displacement or angular displacement and is widely used in closed-loop servo systems that require high-precision position feedback, such as CNC machine tools, measuring instruments, and automation equipment.

[0003] The grating ruler is divided into open type and closed type. The open type is suitable for occasions with a relatively clean environment, while the closed type can effectively prevent dust and oil from entering and is suitable for more severe industrial environments. The closed type requires a steel ruler tape to be installed in the ruler shell, and a certain tension needs to be provided to the steel ruler tape when it is working, so as to ensure the accuracy of the steel ruler tape, so that the reading head can measure the accurate displacement value. The existing steel ruler tape tensioning device provides tension for the steel ruler tape through two tension springs. Although the two tension springs are of the same specification, due to being stretched for a long time, the two tension springs are prone to different mechanical fatigue, resulting in different tensions when the two tension springs are stretched to the same length. When the two tension springs produce different tensions, the steel ruler tape will be unevenly stressed in the ruler shell, resulting in a slight position offset. At this time, the calibration of the reading head is completed, and then when the fixing part is fixed, the steel ruler tape will be re-aligned and parallel to the ruler shell again due to the re-squeezing of the inner wall of the ruler shell by the fixing part, resulting in inaccurate calibration zeroing, resulting in reduced processing accuracy of the entire closed-loop servo system. Summary of the invention

[0004] In order to overcome the disadvantage that the steel ruler tape is unevenly stressed and the precision is reduced due to fatigue of two tension springs, the present invention provides a uniform tensioning device for a grating ruler.

[0005] The technical solution is: a grating ruler uniform tensioning device, including a fixed seat, the fixed seat is provided with a through hole, a bolt is rotatably connected in the through hole of the fixed seat, a cylindrical cavity is provided in the middle of the bolt, one end of the bolt is limitedly matched with the fixed seat and is provided with a hexagonal through hole, the hexagonal through hole of the bolt is connected with the cylindrical cavity in the middle, the bolt is threadedly connected with a threaded sleeve, the threaded sleeve is rotatably connected with a rotating column, the rotating column of the threaded sleeve is fixedly connected with a connecting block, the connecting block is in contact with the fixed seat, and the connecting block is detachable The symmetrical tension springs are symmetrically connected, and the symmetrical tension springs are detachably connected to a positioning slider. The positioning slider is equipped with a hook and an elastic support sheet. The fixing seat is fixed to the grating scale housing by screws. The positioning slider is slidably matched with the internal guide rail of the grating scale housing. One side of the positioning slider is slidingly connected with an extrusion plate, and the extrusion plate is provided with a threaded hole. The threaded hole of the extrusion plate is threadedly connected with a fastening screw. The fastening screw is rotatably connected to the positioning slider, and the extrusion plate is used to squeeze the inner wall of the grating scale housing to limit the positioning slider.

[0006] Furthermore, a first sliding column is slidably connected to one side of the cylindrical cavity of the bolt close to the fixed seat, a spline rod is fixedly connected to one end of the first sliding column close to the positioning slider, a spline sleeve is splined to the spline rod, a positioning ring is fixedly connected to the inner wall of the cylindrical cavity of the bolt, the positioning ring is rotatably connected to a fixing ring, the fixing ring is sleeved on the outer side of the spline sleeve and the two are fixedly connected, and a spring is fixedly connected between the spline sleeve and the spline rod.

[0007] Furthermore, a hexagonal blind hole is provided on one side of the first sliding column away from the spline rod, and six edges of the hexagonal blind hole on the first sliding column are provided with inclined surfaces for easy insertion of a hexagonal wrench, and the area of ​​the hexagonal blind hole of the first sliding column is smaller than the area of ​​the hexagonal through hole of the bolt.

[0008] Furthermore, a first fixing plate is fixedly connected to a side of an inner wall of the cylindrical cavity of the bolt away from the first sliding column, a second fixing plate is fixedly connected to the inner wall of the cylindrical cavity of the bolt, the second fixing plate is located on a side of the first fixing plate close to the first sliding column, a gap exists between the second fixing plate and the first fixing plate, and the first fixing plate is sealed with the inner wall of the cylindrical cavity of the bolt, the second fixing plate is sealed and slidably connected with the second sliding column, a piston is fixedly connected to an end of the second sliding column close to the first fixing plate, the piston is sealed and slidably matched with the inner wall of the cylindrical cavity of the bolt, the piston is located between the second fixing plate and the first fixing plate, and hydraulic oil is injected between the piston and the first fixing plate.

[0009] Furthermore, a spline is provided on the outer side of the second sliding column, the inner wall of the cylindrical cavity of the bolt is fixedly connected to the limit plate, the second sliding column passes through the limit plate, the second sliding column is splined with the limit plate, a threaded hole is provided on the side of the second sliding column close to the spline sleeve, a threaded rod is fixedly connected to one end of the spline sleeve close to the second sliding column, and the threaded rod is threadedly matched with the threaded hole of the second sliding column for adjusting the position of the piston.

[0010] Furthermore, a worm wheel is fixedly connected to the rotating column between the threaded sleeve and the connecting block, the threaded sleeve is rotatably connected to a worm through a mounting seat, the worm is meshed with the worm wheel, a gear is fixedly connected to one end of the worm close to the positioning slider, the threaded sleeve is slidably connected to a rack through a mounting seat, the rack is meshed with the gear, a telescopic rod is fixedly connected to one side of the threaded sleeve close to the positioning slider, and the telescopic end of the telescopic rod is fixedly connected to the rack.

[0011] Furthermore, the first fixed plate is rotatably connected to a connecting head, an oil guide pipe is connected between the connecting head and the telescopic rod, the oil guide pipe is filled with hydraulic oil, and the outer wall of the oil guide pipe is wrapped with an anti-friction protective layer to reduce the wear of the oil guide pipe.

[0012] Furthermore, it also includes a positioning component, which is arranged on a side of the bolt close to the first sliding column, and the positioning component is used to position the bolt, and the positioning component includes a fixing column with circumferentially equal spacing, and the connection between the bolt and the fixing seat is provided with through holes with circumferentially equal spacing, and the fixing columns with circumferentially equal spacing are respectively fixed to adjacent through holes on the bolt, the fixing column is rotatably connected to a rotating plate, and the rotating plate is extruded and fitted with the first sliding column, a torsion spring is fixedly connected between the rotating plate and the bolt, and an extrusion block is fixedly connected to the side of the rotating plate close to the fixing seat, and the extrusion block is extruded and fitted with the fixing seat.

[0013] Furthermore, the extrusion block is made of soft rubber material, and when the extrusion block is extruded, it is deformed and fits against the inner wall of the through hole of the fixing seat.

[0014] Furthermore, the friction force between the extrusion block and the inner wall of the through hole of the fixing seat and the elastic force of the spring are both greater than the friction force between the rotating plate and the first sliding column with equal circumferential spacing, which are used to limit the bolt.

[0015] In summary, the beneficial effects of the present invention are as follows: the present invention changes the swing angle of the connecting block so that the two tension springs present the same tension, thereby improving the accuracy between the steel tape measure and the reading probe, and when the fatigue of the two tension springs is not large, the number of times the tension springs are replaced is reduced, and the service life of the tension springs is extended. At the same time, the self-locking property of the worm gear and the worm is utilized to lock the relative position of the threaded sleeve and the connecting block, thereby ensuring that the tension of the two tension springs is equal; the present invention utilizes the friction force generated by the extrusion block and the inner wall of the through hole of the fixing seat, thereby avoiding the synchronous rotation of the bolt during the rotation of the first sliding column, ensuring the stability of the bolt during the rotation of the first sliding column, and improving the stability of the calibration of the steel tape measure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the fixing seat of the present invention; Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the bolt of the present invention; Figure 4 It is a schematic diagram of the cross-sectional three-dimensional structure of parts such as the spline sleeve and the positioning ring of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the spline sleeve and the second sliding column of the present invention; Figure 6 It is a side view stereoscopic structural diagram of the threaded sleeve and the connecting block and other parts of the present invention; Figure 7 It is a side view stereoscopic structural diagram of the worm wheel and worm and other parts of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the bolt, the first sliding column and the rotating plate of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of parts such as the rotating plate and the extrusion block of the present invention.

[0017] The names of the numbers in the figure are: 1. fixed seat, 2. bolt, 3. threaded sleeve, 4. connecting block, 5. tension spring, 6. positioning slider, 7. extrusion plate, 8. fastening screw, 9. first sliding column, 10. spline rod, 11. spline sleeve, 12. positioning ring, 13. fixing ring, 14. spring, 15. first fixed plate, 16. second fixed plate, 17. second sliding column, 18. piston, 19. limit plate, 20. threaded rod, 21. worm gear, 22. worm, 23. gear, 24. rack, 25. telescopic rod, 26. connecting head, 27. oil guide pipe, 28. fixed column, 29. rotating plate, 30. torsion spring, 31. extrusion block. DETAILED DESCRIPTION

[0018] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0019] During the calibration of the existing grating ruler, it was found that the two tension springs of the tensioner would have different fatigue levels. When the two tension springs tightened the steel ruler tape, the steel ruler tape would be slightly offset on the ruler shell due to the different tensions applied by the two tension springs. Since the steel ruler tape was offset during calibration, after the reading head was calibrated to zero, after the fixing part was locked and fixed, the steel ruler tape was parallel to the ruler shell again, resulting in inaccurate calibration. The following implementation method was adopted to solve the above problem.

[0020] Embodiment 1: A grating ruler uniform tensioning device, such as Figure 1 and Figure 2 As shown, it includes a fixing seat 1, the fixing seat 1 is provided with a through hole, a bolt 2 is rotatably connected in the through hole of the fixing seat 1, a cylindrical cavity is provided in the middle of the bolt 2, the right end of the bolt 2 is limitedly matched with the fixing seat 1 and is provided with a hexagonal through hole, the hexagonal through hole of the bolt 2 is communicated with the cylindrical cavity in the middle thereof, after a hexagonal wrench is inserted into the hexagonal through hole of the bolt 2, the bolt 2 is rotated along the through hole of the fixing seat 1 by rotating the hexagonal wrench, the bolt 2 is threadedly connected with a threaded sleeve 3, the threaded sleeve 3 is rotatably connected with a rotating column, the rotating column of the threaded sleeve 3 is fixedly connected with a connecting block 4, the connecting block 4 is located below the threaded sleeve 3, the connecting block 4 is in contact with the fixing seat 1, when the bolt 2 rotates, the bolt 2 drives the threaded sleeve 3 to move by the thread, and at the same time the connecting block 4 slides along the upper side of the fixing seat 1, and the connecting block 4 is detachably connected with two symmetrical tension springs 5 , two tension springs 5 ​​are located on the left side of the connecting block 4, and the two tension springs 5 ​​are detachably connected with a positioning slider 6. The positioning slider 6 is equipped with a hook and an elastic support sheet. The hook and the elastic support sheet on the positioning slider 6 are existing structures. The fixing seat 1 is fixed to the grating scale shell by screws, and the fixing seat 1 is installed at the right end of the grating scale shell. The positioning slider 6 slides with the internal guide rail of the grating scale shell. The front side of the positioning slider 6 is slidingly connected with an extrusion plate 7, which is used to extrude the inner wall of the grating scale shell, thereby limiting the positioning slider 6. The extrusion plate 7 is provided with a threaded hole, and the threaded hole of the extrusion plate 7 is threadedly connected with a fastening screw 8. The fastening screw 8 is rotatably connected to the positioning slider 6. When the fastening screw 8 rotates and drives the extrusion plate 7 to move forward, the rear side of the positioning slider 6 and the front side of the extrusion plate 7 simultaneously squeeze the inner wall of the grating scale shell.

[0021] like Figure 3 and Figure 4As shown, the right side of the cylindrical cavity of the bolt 2 is slidably connected with a first sliding column 9, and the first sliding column 9 can only slide to the left along the cylindrical cavity of the bolt 2. The left end of the first sliding column 9 is fixedly connected with a spline rod 10, and the spline rod 10 is spline-connected with a spline sleeve 11. A positioning ring 12 is fixedly connected to the inner wall of the cylindrical cavity of the bolt 2, and the positioning ring 12 is rotatably connected with a fixing ring 13. The fixing ring 13 is sleeved on the outer side of the spline sleeve 11 and the two are fixedly connected. The fixing ring 13 is used to limit the spline sleeve 11. A spring 14 is fixedly connected between the key sleeve 11 and the spline rod 10. The spring 14 is used to push the spline rod 10 and the first sliding column 9 to move rightward and reset. A hexagonal blind hole is provided on the right side of the first sliding column 9. The six edges of the hexagonal blind hole on the first sliding column 9 are all provided with inclined surfaces for easy insertion of a hexagonal wrench. The area of ​​the hexagonal blind hole of the first sliding column 9 is smaller than the area of ​​the hexagonal through hole of the bolt 2. When the hexagonal wrench drives the first sliding column 9 to rotate, the hexagonal wrench does not contact the inner wall of the hexagonal through hole of the bolt 2.

[0022] like Figure 5 and Figure 6 As shown, a first fixing plate 15 is fixedly connected to the left side of the inner wall of the cylindrical cavity of the bolt 2, and a second fixing plate 16 is fixedly connected to the inner wall of the cylindrical cavity of the bolt 2. The second fixing plate 16 is located on the right side of the first fixing plate 15. There is a gap between the second fixing plate 16 and the first fixing plate 15, and the first fixing plate 15 is sealed with the inner wall of the cylindrical cavity of the bolt 2. The second fixing plate 16 is sealed and slidably connected with a second sliding column 17. The left end of the second sliding column 17 is fixedly connected with a piston 18. A sealing ring is installed on the outer ring surface of the piston 18 to increase the sealing performance between the piston 18 and the inner wall of the cylindrical cavity of the bolt 2. The piston 18 is sealed and slidably matched with the inner wall of the cylindrical cavity of the bolt 2. The piston 18 is located between the second fixing plate 16 and the first fixing plate 15, and hydraulic oil is injected between the piston 18 and the first fixing plate 15.

[0023] like Figure 5 As shown, a spline is provided on the outer side of the second sliding column 17, the inner wall of the cylindrical cavity of the bolt 2 is fixedly connected to the limit plate 19, the second sliding column 17 passes through the limit plate 19, the second sliding column 17 is splined with the limit plate 19, the limit plate 19 is splined with the outer side of the second sliding column 17 to prevent the second sliding column 17 from rotating, a threaded hole is provided on the right side of the second sliding column 17, a threaded rod 20 is fixedly connected to the left end of the spline sleeve 11, the threaded rod 20 is threadedly matched with the threaded hole of the second sliding column 17, when the threaded rod 20 rotates, the thread on it is used to match with the threaded hole of the second sliding column 17 to adjust the position of the second sliding column 17 and the piston 18.

[0024] like Figure 6 and Figure 7As shown, a worm wheel 21 is fixedly connected to the rotating column between the threaded sleeve 3 and the connecting block 4, and the threaded sleeve 3 is rotatably connected to a worm 22 through a mounting seat, and the worm 22 meshes with the worm wheel 21. The rotation of the worm 22 drives the worm wheel 21 to rotate, and the worm wheel 21 drives the rotating column and the connecting block 4 to rotate, and the tension of the two tension springs 5 ​​is slightly adjusted. A gear 23 is fixedly connected to the left end of the worm 22, and the threaded sleeve 3 is slidably connected to a rack 24 through a mounting seat, and the rack 24 meshes with the gear 23. The left side of the threaded sleeve 3 A telescopic rod 25 is fixedly connected, and the telescopic end of the telescopic rod 25 is fixedly connected to the rack 24. The telescopic end of the telescopic rod 25 is used to change the position of the rack 24. The first fixed plate 15 is rotatably connected to a connector 26. An oil guide pipe 27 is connected between the connector 26 and the telescopic rod 25. The telescopic rod 25 is initially in a semi-extended state. Hydraulic oil is filled in the oil guide pipe 27. The outer wall of the oil guide pipe 27 is wrapped with an anti-friction protective layer to reduce the wear of the oil guide pipe 27 and avoid leakage of the oil guide pipe 27.

[0025] When using the tensioning device, the fixing seat 1 is installed on the right end of the grating scale housing, and the positioning slider 6 is located in the guide groove of the grating scale housing. The staff uses a traction tool to pull the steel ruler tape to the right part of the grating scale housing, and the right end of the steel ruler tape squeezes the elastic support sheet. At the same time, the through hole on the steel ruler tape cooperates with the hook limit on the positioning slider 6. Under the action of the compressed elastic support sheet, the steel ruler tape always cooperates with the hook. When it is necessary to adjust the grating scale for reading correction, the staff inserts a hexagonal wrench into the hexagonal through hole on the right end of the bolt 2, and then the staff starts to rotate the bolt 2 with the hexagonal wrench. Driven by the thread of the bolt 2, the threaded sleeve 3 starts to move to the right, and at the same time, the threaded sleeve 3 drives the connecting block 4 to move to the right synchronously through the rotating column. The connecting block 4 moves to the right along the fixing seat 1, providing anti-torsion force for the threaded sleeve 3 to prevent The two tension springs 5 ​​are twisted. In the process of the threaded sleeve 3 and the connecting block 4 moving to the right, the connecting block 4 pulls the positioning slider 6 to the right through the two tension springs 5. The positioning slider 6 pulls the steel ruler tape to the right through the hook, so that the steel ruler tape is gradually tightened. As the connecting block 4 continues to move to the right, the two tension springs 5 ​​are also gradually stretched. Then the staff adjusts the tension of the grating scale (the moving position of the threaded sleeve 3) according to the value measured by the reading head until the value measured by the reading head returns to zero. The staff stops turning the bolt 2 and then turns the fastening screw 8 with a screwdriver and applies the specified torque to move the extrusion plate 7 to the front side. The front side of the extrusion plate 7 and the rear side of the positioning slider 6 are squeezed on the inner wall of the grating scale housing, so that the positioning slider 6 is limited to avoid the vibration of the steel ruler tape in the scale housing due to external vibration, which causes errors in the reading.

[0026] When the steel tape ruler needs to be recalibrated, the staff first turns the fastening screw 8 with a screwdriver so that the front side of the extrusion plate 7 and the rear side of the positioning slider 6 no longer squeeze the inner wall of the ruler shell. Then the staff reads the steel tape ruler again through the reading head and measures the error value. Since the two tension springs 5 ​​are in a stretched state for a long time, it is easy for the two tension springs 5 ​​to have different fatigue levels. When the steel tape ruler is calibrated again, the staff uses a measuring tool to measure whether the positioning slider 6 is deflected in the ruler shell. If the positioning slider 6 is deflected in the ruler shell, there will be uneven force at the front and rear positions of the right end of the steel tape ruler when it is pulled to the right, resulting in an error in the position of the steel tape ruler. At this time, it is necessary to adjust the tension of the two tension springs 5. The staff uses a hexagonal wrench of the same size as the hexagonal blind hole on the first sliding column 9, and then inserts the wrench into the hexagonal blind hole of the first sliding column 9.

[0027] Before turning the hexagonal wrench, the staff pushes the hexagonal wrench to the left, and the hexagonal wrench squeezes the first sliding column 9 to the left. The first sliding column 9 moves to the left along the cylindrical cavity of the bolt 2, and the first sliding column 9 drives the spline rod 10 to slide to the left. The spline rod 10 slides to the left along the spline sleeve 11, and the spring 14 is compressed. When the first sliding column 9 contacts the spline sleeve 11, the staff turns the hexagonal wrench while applying pressure to the left on the hexagonal wrench. At the same time, the first sliding column 9 rotates along the bolt 2, and the bolt 2 passes through the spline rod 1 0 drives the spline sleeve 11 to rotate synchronously, the spline sleeve 11 drives the fixing ring 13 to rotate along the positioning ring 12, the spline sleeve 11 drives the threaded rod 20 to rotate synchronously, when the threaded rod 20 rotates, the limit plate 19 cooperates with the spline on the second sliding column 17, and the second sliding column 17 can only move left and right. Driven by the threaded rod 20, the second sliding column 17 drives the piston 18 to move synchronously. The staff selects the rotation direction of the hexagonal wrench according to the tilt direction of the positioning slider 6, thereby effectively controlling the position of the piston 18.

[0028] Taking the leftward movement of the piston 18 as an example, when the piston 18 moves to the left, the piston 18 squeezes the hydraulic oil between the first fixed plate 15, and the hydraulic oil of the first fixed plate 15 flows into the oil guide pipe 27 through the connector 26. The hydraulic oil in the oil guide pipe 27 flows into the telescopic rod 25. Under the squeezing action of the hydraulic oil, the telescopic end of the telescopic rod 25 drives the rack 24 to move backward, and the rack 24 drives the gear 23 to rotate. Similarly, the gear 23 drives the worm 22 to rotate. When the worm 22 rotates circumferentially, it drives the worm wheel 21 to rotate synchronously. The worm wheel 21 drives the rotating shaft of the threaded sleeve 3 to rotate synchronously, thereby changing the placement angle of the connecting block 4, thereby adjusting the stretching length of the two tension springs 5. The difference in the stretching length of the two tension springs 5 ​​is a slight deformation. After the swinging angle of the connecting block 4 changes, the two tension springs 5 ​​will be stretched to different lengths. The staff adjusts the swinging of the connecting block 4 according to the positioning slider 6. The staff then stops using the hexagonal wrench to rotate the first sliding column 9, and takes the hexagonal wrench out of the hexagonal blind hole of the first sliding column 9. Under the elastic force of the spring 14, the spring 14 pushes the spline rod 10 and the first sliding column 9 to reset. By changing the swing angle of the connecting block 4, the two tension springs 5 ​​can present the same tension, thereby improving the accuracy between the steel tape and the reading probe. When the fatigue of the two tension springs 5 ​​is not large, the number of times the tension springs 5 ​​are replaced is reduced, and the service life of the tension springs 5 ​​is extended. At the same time, the self-locking property of the worm gear 21 and the worm 22 is used to lock the relative position of the threaded sleeve 3 and the connecting block 4, thereby ensuring the tension of the two tension springs 5. The staff then uses the screwdriver to rotate the fastening screw 8 again to re-fix the positioning slider 6.

[0029] Embodiment 2: Based on embodiment 1, Figure 2 , Figure 8 and Fig. 9As shown, a positioning assembly is also included, which is arranged on the right side of the bolt 2. The positioning assembly is used to position the bolt 2. The positioning assembly includes six fixed columns 28 with equal circumferential spacing. The connection between the bolt 2 and the fixed seat 1 is provided with six through holes with equal circumferential spacing. The six fixed columns 28 are respectively fixed in adjacent through holes on the bolt 2. The fixed column 28 is rotatably connected with a rotating plate 29. The rotating plate 29 is pressed and matched with the first sliding column 9. When the first sliding column 9 moves to the left, the inner ends of the six rotating plates 29 are simultaneously squeezed by the first sliding column 9 and rotate along the adjacent fixed columns 28 respectively. A torsion spring 30 is fixed between the rotating plate 29 and the bolt 2. The torsion spring 30 is used to drive the adjacent rotating plate 29 to reset. An extrusion block 31 is fixedly connected to the outer side of the rotating plate 29. The extrusion block 31 is extruded and matched with the fixed seat 1. The extrusion block 31 is set to a soft rubber material. When the extrusion block 31 is extruded, it is deformed and fits against the inner wall of the through hole of the fixed seat 1. The friction between the extrusion block 31 and the inner wall of the through hole of the fixed seat 1 and the elastic force of the spring 14 are both greater than the friction between the circumferentially equidistant rotating plates 29 and the first sliding column 9. During the rotation of the first sliding column 9, the six extrusion blocks 31 are used to squeeze the inner wall of the through hole of the fixed seat 1 to limit the bolt 2 to prevent the bolt 2 from rotating synchronously with the first sliding column 9.

[0030] When the tension of the two tension springs 5 ​​is adjusted, under the action of the leftward extrusion force of the hexagonal wrench, the first sliding column 9 moves to the left, and the first sliding column 9 squeezes the inner ends of the six rotating plates 29. After being squeezed, the six rotating plates 29 rotate along the adjacent fixed columns 28. At the same time, the torsion spring 30 is tightened. During the rotation of the rotating plates 29 along the adjacent fixed columns 28, the rotating plates 29 drive the extrusion blocks 31 thereon to squeeze the inner wall of the through hole of the fixed seat 1. The extrusion blocks 31 are deformed by the extrusion and fit against the inner wall of the through hole of the fixed seat 1. During the rotation of the first sliding column 9 by the staff, the six extrusion blocks 31 generate friction with the inner wall of the through hole of the fixed seat 1, thereby avoiding the synchronous rotation of the bolt 2 during the rotation of the first sliding column 9, ensuring the stability of the bolt 2 during the rotation of the first sliding column 9, and improving the stability of the calibration of the steel ruler tape.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grating ruler uniform tensioning device, comprising a fixing seat (1), the fixing seat (1) being provided with a through hole, a bolt (2) being rotatably connected in the through hole of the fixing seat (1), a cylindrical cavity being provided in the middle of the bolt (2), one end of the bolt (2) being limitedly matched with the fixing seat (1) and provided with a hexagonal through hole, the hexagonal through hole of the bolt (2) being connected with the cylindrical cavity in the middle thereof, the bolt (2) being threadedly connected with a threaded sleeve (3), wherein: The invention also comprises a connecting block (4), wherein the threaded sleeve (3) is rotatably connected to a rotating column, the connecting block (4) is fixedly connected to the rotating column of the threaded sleeve (3), the connecting block (4) is in contact with the fixing seat (1), the connecting block (4) is detachably connected to a symmetrical tension spring (5), the symmetrical tension springs (5) are detachably connected to a positioning slide block (6), the positioning slide block (6) is provided with a hook and an elastic support sheet, the fixing seat (1) is fixedly connected to the grating scale housing by screws, the positioning slide block (6) is slidably matched with an internal guide rail of the grating scale housing, one side of the positioning slide block (6) is limitedly slidably connected to an extrusion plate (7), the extrusion plate (7) is provided with a threaded hole, a fastening screw (8) is threadedly connected to the threaded hole of the extrusion plate (7), the fastening screw (8) is rotatably connected to the positioning slide block (6), and the extrusion plate (7) is used to squeeze the inner wall of the grating scale housing to limit the positioning slide block (6).

2. The grating ruler uniform tensioning device according to claim 1 is characterized in that: A first sliding column (9) is slidably connected to one side of the cylindrical cavity of the bolt (2) close to the fixing seat (1); a spline rod (10) is fixedly connected to one end of the first sliding column (9) close to the positioning slider (6); the spline rod (10) is spline-connected to a spline sleeve (11); a positioning ring (12) is fixedly connected to the inner wall of the cylindrical cavity of the bolt (2); the positioning ring (12) is rotatably connected to a fixing ring (13); the fixing ring (13) is sleeved on the outer side of the spline sleeve (11) and the two are fixedly connected; a spring (14) is fixedly connected between the spline sleeve (11) and the spline rod (10).

3. The grating ruler uniform tensioning device according to claim 2 is characterized in that: A hexagonal blind hole is provided on a side of the first sliding column (9) away from the spline rod (10); six edges of the hexagonal blind hole on the first sliding column (9) are all provided with inclined surfaces for facilitating the insertion of a hexagonal wrench; the area of ​​the hexagonal blind hole of the first sliding column (9) is smaller than the area of ​​the hexagonal through hole of the bolt (2).

4. The grating ruler uniform tensioning device according to claim 3 is characterized in that: A first fixing plate (15) is fixedly connected to a side of the inner wall of the cylindrical cavity of the bolt (2) away from the first sliding column (9), and a second fixing plate (16) is fixedly connected to the inner wall of the cylindrical cavity of the bolt (2). The second fixing plate (16) is located on a side of the first fixing plate (15) close to the first sliding column (9). A gap exists between the second fixing plate (16) and the first fixing plate (15), and the first fixing plate (15) is sealed with the inner wall of the cylindrical cavity of the bolt (2). The second fixing plate (16) is sealed and slidably connected to a second sliding column (17). A piston (18) is fixedly connected to one end of the second sliding column (17) close to the first fixing plate (15). The piston (18) is sealed and slidably matched with the inner wall of the cylindrical cavity of the bolt (2). The piston (18) is located between the second fixing plate (16) and the first fixing plate (15), and hydraulic oil is injected between the piston (18) and the first fixing plate (15).

5. The grating ruler uniform tensioning device according to claim 4 is characterized in that: The outer side of the second sliding column (17) is provided with a spline, the inner wall of the cylindrical cavity of the bolt (2) is fixedly connected to a limit plate (19), the second sliding column (17) passes through the limit plate (19), the second sliding column (17) and the limit plate (19) are spline-matched, a threaded hole is provided on one side of the second sliding column (17) close to the spline sleeve (11), a threaded rod (20) is fixedly connected to one end of the spline sleeve (11) close to the second sliding column (17), the threaded rod (20) is threadedly matched with the threaded hole of the second sliding column (17) for adjusting the position of the piston (18).

6. The grating ruler uniform tensioning device according to claim 5 is characterized in that: A worm wheel (21) is fixedly connected to the rotating column between the threaded sleeve (3) and the connecting block (4); the threaded sleeve (3) is rotatably connected to a worm (22) via a mounting seat; the worm (22) meshes with the worm wheel (21); a gear (23) is fixedly connected to one end of the worm (22) close to the positioning slider (6); the threaded sleeve (3) is slidably connected to a rack (24) via a mounting seat; the rack (24) meshes with the gear (23); a telescopic rod (25) is fixedly connected to one side of the threaded sleeve (3) close to the positioning slider (6); the telescopic end of the telescopic rod (25) is fixedly connected to the rack (24).

7. The grating ruler uniform tensioning device according to claim 6 is characterized in that: The first fixed plate (15) is rotatably connected to a connecting head (26); an oil guide pipe (27) is connected between the connecting head (26) and the telescopic rod (25); hydraulic oil is filled in the oil guide pipe (27); an outer wall of the oil guide pipe (27) is wrapped with an anti-friction protective layer for reducing wear of the oil guide pipe (27).

8. The grating ruler uniform tensioning device according to claim 7 is characterized in that: The invention also comprises a positioning component, which is arranged on a side of the bolt (2) close to the first sliding column (9), and is used to position the bolt (2). The positioning component comprises fixed columns (28) with circumferentially equal spacing, and a connection between the bolt (2) and the fixing seat (1) is provided with through holes with circumferentially equal spacing, and the fixed columns (28) with circumferentially equal spacing are respectively fixedly connected to adjacent through holes on the bolt (2), and the fixed column (28) is rotatably connected to a rotating plate (29), and the rotating plate (29) is pressed and matched with the first sliding column (9), and a torsion spring (30) is fixedly connected between the rotating plate (29) and the bolt (2), and a pressing block (31) is fixedly connected to a side of the rotating plate (29) close to the fixing seat (1), and the pressing block (31) is pressed and matched with the fixing seat (1).

9. The grating ruler uniform tensioning device according to claim 8, characterized in that: The extrusion block (31) is made of a soft rubber material, and when the extrusion block (31) is extruded, it deforms and fits against the inner wall of the through hole of the fixing seat (1).

10. The grating ruler uniform tensioning device according to claim 9, characterized in that: The friction force between the extrusion block (31) and the inner wall of the through hole of the fixing seat (1) and the elastic force of the spring (14) are both greater than the friction force between the rotating plate (29) and the first sliding column (9) at equal circumferential intervals, and are used to limit the bolt (2).

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