Long guide rail straightness measuring system

Abstract

The utility model relates to the technical field of guide rail straightness measurement, and discloses a long guide rail straightness measuring system which comprises a level gauge and a measuring device, a swing part and a scale are arranged in the measuring device, and a first marking assembly and a second marking assembly are arranged at the two ends of the swing part respectively. The first marking assembly and the second marking assembly are provided with a first marking line and a second marking line respectively, the ruler is arranged at one end of the measuring device, the horizontal distance between the second marking line and the swing axis of the swing part is a times of the horizontal distance between the first marking line and the swing axis of the swing part, and a is larger than 1. The horizontal projection of the swing axis of the swing piece is located on the 0 scale line of the ruler. When the measuring device is located at the deformation position of the guide rail, the swing piece is driven to swing so that the first marking line can coincide with the horizontal line of the level gauge, the vertical distance between the second marking line and the zero scale of the scale is a times of the deformation quantity of the guide rail, the deformation quantity of the guide rail is amplified by a times so that a worker can read conveniently, and precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of guide rail straightness measurement, in particular to a long guide rail straightness measurement system. Background Art

[0002] With the development of science and technology, long guide rails are used in more and more scenarios, and the demand is also increasing. They can usually be used in scenarios such as large CNC machine tools, automated production lines, warehousing systems, large stage machinery, etc., and because the guide rails are too long, they are often horizontal at both ends and bent downward in the middle. This is because there is no support in the middle and it will bend downward under the action of gravity. During the installation process, long guide rails are often only supported at both ends, so it is inevitable that the middle part of the long guide rail will bend downward after installation. At this time, when manufacturing such long guide rails, it is necessary to test the straightness or horizontality of the long guide rails to detect whether they meet the standards, and to make appropriate corrections to unqualified products.

[0003] When testing the straightness or levelness of long guide rails, due to the high accuracy of the standard, it will be difficult to read the readings during direct measurement. Errors are inevitable during testing, so the final test reading will be more different from the actual data. On the other hand, if the deformation of the long guide rail is small, it cannot be directly observed with the naked eye.

[0004] Based on this, the technical problem to be solved in this case is: how to amplify and measure the deformation of the guide rail. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a long guide rail straightness measurement system. Before measurement, the system makes the horizontal line of the level, the first marking line, the second marking line and the 0 scale line of the ruler coincide with each other, and drives the measuring device to slide on the guide rail until it is located at the deformation position of the guide rail. At this time, the horizontal line of the level no longer coincides with the first marking line, the second marking line and the 0 scale line of the ruler, while the first marking line, the second marking line and the 0 scale line of the ruler are still in the coincident state, and drives the swing part to swing on the vertical plane so that the first marking line coincides with the horizontal line of the level again, which is the deformation amount of the guide rail, and the distance moved by the second marking line on the vertical plane is a times the distance moved by the first marking line on the vertical plane, that is, the vertical distance between the second marking line and the 0 scale line is a times the deformation amount of the guide rail, so as to facilitate the reading of the staff and help improve the measurement accuracy.

[0006] The technical solution of the utility model is:

[0007] A long guide rail straightness measurement system includes a level located at one end of the guide rail, a measuring device slidably connected to the guide rail, a swinging member and a ruler disposed within the measuring device, a first marking assembly disposed at one end of the swinging member and a second marking assembly disposed at the other end, the first marking assembly and the second marking assembly being provided with a first marking line and a second marking line, respectively, the ruler being vertically disposed at one end of the measuring device proximate to the second marking line assembly, the horizontal distance between the second marking line and the swing axis of the swinging member being a times the horizontal distance between the first marking line and the swing axis of the swinging member, where a is greater than 1, and when the guide rail is horizontal, the horizontal projection of the swing axis of the swinging member is located on the zero scale line of the ruler;

[0008] When the measuring device is located at the deformation position of the guide rail and the swinging member is horizontal, the swinging member is driven to swing so that the first marking line coincides with the horizontal line of the level instrument, and the vertical distance between the second marking line and the 0 scale of the ruler is a times the deformation of the guide rail.

[0009] Preferably, the measuring device includes a frame, the swinging member is arranged in the frame, one end of the frame is provided with a through hole for observing the swinging member in the frame from the level, and the ruler is vertically arranged on one end of the frame close to the second marking assembly and opposite to the level.

[0010] Preferably, the swinging member includes a movable plate and an adjusting assembly hinged in the frame, the first marking assembly and the second marking assembly are respectively connected to the two ends of the movable plate, the adjusting assembly is movably connected to the bottom of the frame, and one end of the adjusting assembly is connected to the bottom of the second marking assembly, and the adjusting assembly is used to drive the second marking assembly upward or downward to drive the first marking assembly downward or upward.

[0011] Preferably, the first marking line assembly includes a first fixing block connected to the bottom of the movable plate, and a first connecting column connected to the first fixing block, the first connecting columns are symmetrically arranged, and the first marking line is symmetrically arranged between the first connecting columns;

[0012] The second marking assembly includes a second fixing block connected to the bottom of the movable plate, a second connecting column connected to the second fixing block, the second connecting columns are symmetrically arranged, the second marking line is symmetrically arranged between the second connecting columns, and one end of the adjustment assembly is connected to the bottom of the second fixing block;

[0013] When the guide rail is horizontal, the first marking line and the second marking line both coincide with the horizontal line of the level.

[0014] Preferably, the first connecting post is slidably connected to the first fixing block, the bottom end of the first connecting post is provided with a first adjusting nut threadedly connected to the first connecting post, the top end of the first connecting post is provided with a first connecting block, the side wall of the first connecting block contacts the side wall of the movable plate, a first spring is further provided between the first connecting block and the first fixing block, and the first marking line is connected to the first connecting block;

[0015] The second connecting column is slidably connected to the second fixed block, the bottom end of the second connecting column is provided with a second adjusting nut threadedly connected to the second connecting column, the top end of the second connecting column is provided with a second connecting block, the side wall of the second connecting block is in contact with the side wall of the movable plate, and a second spring is also provided between the second connecting block and the second fixed block, and the second marking line is connected to the second connecting block.

[0016] Preferably, the adjustment assembly includes an adjustment screw rotatably connected to the second fixed block, a third adjustment nut threadedly connected to the adjustment screw, the adjustment screw is movably connected to the bottom of the frame, the third adjustment nut contacts the bottom of the frame, and a third spring is also sleeved on the adjustment screw, and the third spring is located between the second fixed block and the frame.

[0017] Preferably, the measuring device also includes a base and a rotating frame, the base is provided with a dial, the dial is provided with a third connecting column, the rotating frame is rotatably connected to the third connecting column, the frame is connected to the rotating frame, the rotating frame is provided with a vertically arranged pointer assembly, and the side wall of the dial is provided with a scale.

[0018] Preferably, it also includes an adjustment block, a threaded section is provided on the third connecting column, the adjustment block is threadedly connected to the threaded section, and the bottom of the rotating frame contacts the top of the adjustment block. The adjustment block is used to adjust the distance between the rotating frame and the base. The pointer assembly is connected to the rotating frame in a liftable manner, and a roller is provided at the bottom of the pointer assembly, which contacts the top of the dial.

[0019] Preferably, a connecting pipe is arranged obliquely on the top of the rack. The connecting pipe is a hollow structure and is used for allowing an external spotlight to pass through the inner cavity of the connecting pipe to illuminate the scale.

[0020] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0021] Before measurement, the utility model makes the horizontal line of the level, the first marking line, the second marking line and the 0 scale line of the ruler coincide with each other, and drives the measuring device to slide on the guide rail until it is located at the deformation position of the guide rail. At this time, the horizontal line of the level no longer coincides with the first marking line, the second marking line and the 0 scale line of the ruler, while the first marking line, the second marking line and the 0 scale line of the ruler are still in the coincident state, and drives the swinging part to swing on the vertical plane so that the first marking line coincides with the horizontal line of the level again, which is the deformation amount of the guide rail, and the distance moved by the second marking line on the vertical plane is a times the distance moved by the first marking line on the vertical plane, that is, the vertical distance between the second marking line and the 0 scale line is a times the deformation amount of the guide rail, so as to facilitate the reading of the staff and help improve the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the measuring device of the utility model;

[0023] Figure 2 It is a side view of the measuring device of the utility model;

[0024] Figure 3 A schematic diagram of the interior of the rack of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the utility model;

[0026] Figure 5 for Figure 1 BB cross-sectional view;

[0027] Figure 6 It is a schematic diagram of the swinging of the swinging member of the utility model;

[0028] Figure 7 This is a measurement diagram of Example 1 of the present utility model;

[0029] Figure 8 A schematic diagram of the structure of the measurement of the utility model;

[0030] Figure 9 This is a schematic diagram of the swinging state of the swinging member in Example 1 of the present invention.

[0031] The reference numerals of the drawings are as follows: 1. frame; 2. horizontal line of level; 5. zero scale line of ruler; 6. adjustment block; 7. level; 8. guide rail; 11. swing member; 12. first marking assembly; 13. second marking assembly; 14. through hole; 15. ruler; 16. base; 17. rotating frame; 18. connecting pipe; 19. spirit level; 111. movable plate; 112. adjustment assembly; 121. first fixing block; 122. first connecting column; 123 , first marking line; 124, first adjusting nut; 125, first spring; 126, first connecting block; 131, second fixing block; 132, second connecting column; 133, second marking line; 134, second adjusting nut; 135, second spring; 136, second connecting block; 161, dial; 162, third connecting column; 171, pointer assembly; 1121, adjusting screw; 1122, third adjusting nut; 1123, third spring; 1711, roller. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1

[0034] See also Figures 1 to 9 A long guide rail straightness measurement system includes a level located at one end of the guide rail and a measuring device slidably connected to the guide rail, wherein a swinging member 11 and a ruler 15 are provided in the measuring device, a first marking assembly 12 is provided at one end of the swinging member 11, and a second marking assembly 13 is provided at the other end, a first marking line 123 and a second marking line 133 are provided on the first marking line assembly 12 and the second marking line assembly 13, respectively, the ruler 15 is vertically arranged on one end of the measuring device close to the second marking line assembly 13, the horizontal distance between the second marking line assembly 13 and the swing axis of the swinging member 11 is a times the horizontal distance between the first marking line assembly 12 and the swing axis of the swinging member, and a is greater than 1, and when the guide rail is horizontal, the horizontal projection of the swing axis of the swinging member 11 is located on the 0 scale line 5 of the ruler;

[0035] When the measuring device is located at the deformation position of the guide rail and the swinging member 11 is horizontal, the swinging member 11 is driven to swing so that the first marking assembly 12 coincides with the horizontal line 2 of the level, and the vertical distance between the second marking assembly 13 and the 0 scale line 5 of the ruler is a times the deformation amount of the guide rail.

[0036] It should be noted that the level in this embodiment is a level instrument with a cross-hair scale, and the length of the guide rail is more than 8m.

[0037] In actual operation, before measurement, the staff will overlap the horizontal line 2 of the level, the first marking line component 12, the second marking line component 13, and the 0 scale line 5 of the ruler to ensure that the above four are in a horizontal state. Specifically, the staff determines whether they overlap by observing from the level, and then drives the measuring device to move in the length direction of the guide rail. When the guide rail is horizontal, the horizontal line 2 of the level, the first marking line 123, the second marking line 133, and the 0 scale line 5 of the ruler are still in an overlapping state. Until the measuring device moves to the deformation position of the guide rail, the horizontal line 2 of the level no longer overlaps with the first marking line 123, while the first marking line 123, the second marking line 133, and the 0 scale line 5 of the ruler are still in an overlapping state. The staff drives the swing member 11 to swing on the vertical plane, so that the first marking line component 12 moves toward the horizontal line 2 of the level instrument, while the second marking line assembly 13 moves in the opposite direction. When the first marking line 123 coincides with the horizontal line 2 of the level instrument again, since the horizontal projection of the swing axis of the swing member 11 is located on the 0 scale line 5 of the ruler, the first marking line 123 moves a distance of the guide rail deformation in the vertical plane, while the second marking line 133 moves a distance a times in the vertical plane. Because the horizontal distance between the second marking line 133 and the swing axis of the swing member 11 is a times the horizontal distance between the first marking line 123 and the swing axis of the swing member 11, and a is greater than 1, it means that the distance moved by the second marking line 133 in the vertical plane must be greater than the distance moved by the first marking line 123 in the vertical plane. This method of amplifying the guide rail deformation makes it easier for staff to read and can improve the accuracy of measurement.

[0038] See also Figure 9, further illustrating the above example, taking the state after the swinging member is driven to swing as an example, the straight-line distance (hypotenuse) between the first marking line 123 and the swing axis of the swinging member 11, the distance d (a right-angled side) moved by the first marking line 123 on the vertical plane, and the horizontal distance (another right-angled side) between the first marking line 123 and the swing axis of the swinging member 11 form a right triangle c1; similarly, the straight-line distance (hypotenuse) between the second marking line 133 and the swing axis of the swinging member 11, the distance b (a right-angled side) moved by the second marking line 133 on the vertical plane, and the horizontal distance (another right-angled side) between the second marking line 133 and the swing axis of the swinging member 11 form another right triangle c2. The first marking line 123 and the second marking line 133 are located on the swinging member 11, and the horizontal distance between the first marking line 123 and the swinging axis of the swinging member 11 and the horizontal distance between the second marking line 133 and the swinging axis of the swinging member 11 are parallel to each other, so c1 and c2 are similar triangles. Since the horizontal distance between the second marking line 133 and the swinging axis of the swinging member 11 is a times the horizontal distance between the first marking line 123 and the swinging axis of the swinging member 11, the distance moved by the second marking line 133 on the vertical plane is a times the distance moved by the first marking line 123 on the vertical plane, so the distance between the second marking line 133 and the 0 scale line 5 of the ruler is a times the deformation of the guide rail.

[0039] Preferably, the measuring device includes a frame 1, the swing member 11 is arranged in the frame 1, one end of the frame 1 is provided with a through hole 14 for observing into the frame from the level, and the ruler 15 is vertically arranged on one end of the frame 1 close to the second marking assembly 13.

[0040] In this embodiment, the frame 1 makes it convenient for the staff to operate the entire measuring device, and the staff can directly observe and read the scale on the ruler 15 from the through hole 14. In particular, the range of the through hole 14 includes the entire scale 15, which can ensure that the staff can read the scale of the ruler 15, and before driving the measuring device to move along the length direction of the guide rail, the horizontal line 2 of the level coincides with the 0 scale line 5 of the ruler, that is, the first mark line 123 and the second mark line 133 also coincide with the 0 scale line 5 of the ruler. When moved to the deformation position of the guide rail, since the ruler 15 is located at one end of the frame 1, the first mark line 123, the second mark line 133 and the 0 scale line 5 of the ruler still coincide with each other, which is conducive to the staff reading the descending height of the second mark line 133.

[0041] More preferably, the swing member 11 includes a movable plate 111 and an adjusting component 112 hinged in the frame, the first marking component 12 and the second marking component 13 are respectively connected to the two ends of the movable plate 111, the adjusting component 112 is movably connected to the bottom of the frame 1, and one end of the adjusting component 112 is connected to the bottom of the second marking component 13, and the adjusting component 112 is used to drive the second marking component 13 upward or downward to drive the first marking component 12 downward or upward.

[0042] In the above design, the swing angle of the swing member 11 is achieved by the adjustment component 112 driving the second marking component 13 upward or downward. For example: when the adjustment component 112 drives the second marking component 13 downward, since the second marking component 13 is located on the swing member 11, the end of the swing member 11 close to the second marking component 13 will move downward with the second marking component 13, so that the swing member 11 swings a certain angle, and the first marking component 12 moves upward at the same time, which is beneficial for the staff to drive the swing member 11 to move.

[0043] Furthermore, the first marking assembly 12 includes a first fixing block 121 connected to the bottom of the movable plate, and a first connecting column 122 connected to the first fixing block 121. The first connecting columns 122 are symmetrically arranged, and the first marking lines 123 are symmetrically arranged between the first connecting columns 122.

[0044] In the above design, the symmetrical arrangement of the first connecting column 122 can facilitate the staff to observe from the level that the first marking line 123 coincides with the horizontal line 2 of the level, and the first marking line 123 and the cross-hair scale observed from the level are actually projected vertically onto the scale 15, which is conducive to improving measurement accuracy.

[0045] Furthermore, the second marking assembly 13 includes a second fixing block 131 connected to the bottom of the movable plate 111, and a second connecting column 132 connected to the second fixing block 131. The second connecting columns 132 are symmetrically arranged, and the second marking line 133 is symmetrically arranged between the second connecting columns 132. One end of the adjustment assembly 112 is connected to the bottom of the second fixing block 131.

[0046] In the above design, the symmetrical arrangement of the second connecting column 132 can facilitate the staff to observe from the level that the second marking line 133 coincides with the horizontal line 2 of the level, and the second marking line 133 and the cross-hair scale observed from the level are actually projected vertically onto the scale 15, which is conducive to improving measurement accuracy.

[0047] Furthermore, when the guide rail is horizontal, the first marking line 123 and the second marking line 133 both coincide with the horizontal line 2 of the level.

[0048] In the above design, when the guide rail is horizontal, that is, before driving the measuring device, the first marking line 123 and the second marking line 133 both coincide with the horizontal line 2 of the level instrument to ensure that the three are on the same horizontal plane, which is beneficial to the accuracy of subsequent measurements.

[0049] Preferably, the first connecting column 122 is slidably connected to the first fixing block 121. The bottom end of the first connecting column 122 is provided with a first adjusting nut 124 threadedly connected to the first connecting column 122. The top end of the first connecting column 122 is provided with a first connecting block 126. The side wall of the first connecting block 126 contacts the side wall of the movable plate 111. A first spring 125 is further provided between the first connecting block 126 and the first fixing block 121. The first marking line 123 is connected to the first connecting block 126.

[0050] More preferably, the second connecting column 132 is slidably connected to the second fixed block 131, the bottom end of the second connecting column 132 is provided with a second adjusting nut 134 threadedly connected to the second connecting column 132, the top of the second connecting column 132 is provided with a second connecting block 136, the side wall of the second connecting block 136 is in contact with the side wall of the movable plate 111, and a second spring 135 is also provided between the second connecting block 136 and the second fixed block 131, and the second marking line 133 is connected to the second connecting block 136.

[0051] Through the above design, when the adjustment component 112 adjusts the second mark line 133 to move up or down, the first mark line 123 moves down or up at the same time. During the movement, the first mark line 123 can make the first mark line 123 move more stably through the first connecting block and the first spring 125. Similarly, the second mark line 133 can make the second mark line 133 move more stably through the second connecting block and the second spring 135, which is beneficial for the staff to adjust and read the readings and improve the measurement accuracy. The first mark line 123 and the second mark line 133 are respectively connected to the first connecting block and the second connecting block, which is beneficial to fixing the first mark line 123 and the second mark line 133, avoiding the instability of the first mark line 123 and the second mark line 133 and affecting the measurement accuracy.

[0052] More preferably, the adjustment assembly 112 includes an adjustment screw 1121 rotatably connected to the second fixed block 131, and a third adjustment nut 1122 threadedly connected to the adjustment screw 1121, the adjustment screw 1121 is movably connected to the bottom of the frame 1, the third adjustment nut 1122 contacts the bottom of the frame 1, and a third spring 1123 is further sleeved on the adjustment screw 1121, and the third spring 1123 is located between the second fixed block 131 and the frame 1.

[0053] In the above design, the height of the second marking assembly 13 can be adjusted by rotating the third adjusting nut 1122. Specifically, the adjusting screw 1121 plays a guiding role, so that the second marking assembly 13 can move vertically upward or vertically downward, thereby improving the adjustment accuracy and facilitating the accuracy of the readings by the staff.

[0054] Furthermore, the measuring device also includes a base 16 and a rotating frame 17. The base 16 is provided with a dial 161, the dial 161 is provided with a third connecting column 162, the rotating frame 17 is rotatably connected to the third connecting column 162, the frame 1 is connected to the rotating frame 17, the rotating frame 17 is provided with a vertically arranged pointer assembly 171, and the side wall of the dial 161 is provided with a scale.

[0055] In actual application, the staff can rotate the angle of the frame 1 on the horizontal plane through the rotating frame 17, so that the staff can adjust the measuring device before measurement to improve the accuracy. On the other hand, the staff can also identify the rotation distance through the pointer assembly 171 and the scale, which is beneficial for the staff to intuitively observe the adjusted rotation value.

[0056] Furthermore, it also includes an adjustment block 7, a threaded section is provided on the third connecting column 162, the adjustment block 6 is threadedly connected to the threaded section, and the bottom of the rotating frame 17 contacts the top of the adjustment block 6, and the adjustment block 6 is used to adjust the distance between the rotating frame 17 and the base 16, and the pointer assembly 171 is connected to the rotating frame 17 in a liftable manner. A roller is provided at the bottom of the pointer assembly 171, and the roller contacts the top of the dial.

[0057] More preferably, it further includes an adjustment block 6, a threaded section is provided on the third connecting column 162, the adjustment block 6 is threadedly connected to the threaded section, and the bottom of the rotating frame 17 contacts the top of the adjustment block 6, the adjustment block 6 is used to adjust the distance between the rotating frame 17 and the base 16, the pointer assembly 171 is connected to the rotating frame 17 in a liftable manner, and a roller 1711 is provided at the bottom of the pointer assembly 171, and the roller 1711 contacts the top of the dial 161.

[0058] A connecting pipe 18 is arranged obliquely on the top of the frame 1 . The connecting pipe 18 is a hollow structure and is used for allowing an external spotlight to pass through the inner cavity of the connecting pipe 18 to illuminate the scale 15 .

[0059] Since the frame 1 is a receiving space with only the through hole 14, the internal brightness is limited. The connecting tube 18 can facilitate the staff to install a spotlight to illuminate the scale 15 for the staff to read. In particular, a level ruler 19 is also provided on the top of the frame 1 to facilitate the staff to determine whether the swing member 11 is in a horizontal state.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A long guide rail straightness measurement system, characterized in that: The invention comprises a level located at one end of a guide rail, a measuring device slidably connected to the guide rail, a swinging member and a ruler provided in the measuring device, a first marking assembly provided at one end of the swinging member, and a second marking assembly provided at the other end, the first marking assembly and the second marking assembly being provided with a first marking line and a second marking line, respectively, the ruler being vertically arranged at one end of the measuring device close to the second marking line assembly, the horizontal distance between the second marking line and the swinging axis of the swinging member being a times the horizontal distance between the first marking line and the swinging axis of the swinging member, and a being greater than 1, and when the guide rail is horizontal, the horizontal projection of the swinging axis of the swinging member is located on the 0 scale line of the ruler; When the measuring device is located at the deformation position of the guide rail and the swinging member is horizontal, the swinging member is driven to swing so that the first marking line coincides with the horizontal line of the level instrument, and the vertical distance between the second marking line and the 0 scale of the ruler is a times the deformation of the guide rail.

2. A long guide rail straightness measurement system according to claim 1, characterized in that: The measuring device includes a frame, the swinging member is arranged in the frame, one end of the frame is provided with a through hole for observing the swinging member in the frame from the level, and the ruler is vertically arranged on one end of the frame close to the second marking assembly and opposite to the level.

3. A long guide rail straightness measurement system according to claim 1, characterized in that: The swinging member includes a movable plate and an adjusting component hinged in the frame. The first marking component and the second marking component are respectively connected to the two ends of the movable plate. The adjusting component is movably connected to the bottom of the frame, and one end of the adjusting component is connected to the bottom of the second marking component. The adjusting component is used to drive the second marking component upward or downward to drive the first marking component downward or upward.

4. A long guide rail straightness measurement system according to claim 3, characterized in that: The first marking line assembly includes a first fixing block connected to the bottom of the movable plate, and a first connecting column connected to the first fixing block, wherein the first connecting columns are symmetrically arranged, and the first marking line is provided between the symmetrically arranged first connecting columns; The second marking line assembly includes a second fixing block connected to the bottom of the movable plate, and a second connecting column connected to the second fixing block, wherein the second connecting columns are symmetrically arranged, and the second marking line is provided between the symmetrically arranged second connecting columns, and one end of the adjustment assembly is connected to the bottom of the second fixing block; When the guide rail is horizontal, the first marking line and the second marking line both coincide with the horizontal line of the level.

5. A long guide rail straightness measurement system according to claim 4, characterized in that: The first connecting post is slidably connected to the first fixed block, the bottom end of the first connecting post is provided with a first adjusting nut threadedly connected to the first connecting post, the top end of the first connecting post is provided with a first connecting block, the side wall of the first connecting block is in contact with the side wall of the movable plate, a first spring is further provided between the first connecting block and the first fixed block, and the first marking line is connected to the first connecting block; The second connecting column is slidably connected to the second fixed block, the bottom end of the second connecting column is provided with a second adjusting nut threadedly connected to the second connecting column, the top end of the second connecting column is provided with a second connecting block, the side wall of the second connecting block is in contact with the side wall of the movable plate, a second spring is also provided between the second connecting block and the second fixed block, and the second marking line is connected to the second connecting block.

6. A long guide rail straightness measurement system according to claim 3, characterized in that: The adjusting assembly includes an adjusting screw rotatably connected to the second fixed block, a third adjusting nut threadedly connected to the adjusting screw, the adjusting screw is movably connected to the bottom of the frame, the third adjusting nut contacts the bottom of the frame, and a third spring is further sleeved on the adjusting screw, and the third spring is located between the second fixed block and the frame.

7. A long guide rail straightness measurement system according to claim 2, characterized in that: The measuring device also includes a base and a rotating frame. The base is provided with a dial, the dial is provided with a third connecting column, the rotating frame is rotatably connected to the third connecting column, the frame is connected to the rotating frame, a vertically arranged pointer assembly is provided on the rotating frame, and the side wall of the dial is provided with scales.

8. A long guide rail straightness measurement system according to claim 7, characterized in that: It also includes an adjustment block, the third connecting column is provided with a threaded section, the adjustment block is threadedly connected to the threaded section, and the bottom of the rotating frame is in contact with the top of the adjustment block, the adjustment block is used to adjust the distance between the rotating frame and the base, the pointer assembly is connected to the rotating frame in a liftable manner, the bottom of the pointer assembly is provided with a roller, and the roller is in contact with the top of the dial.

9. The long guide rail straightness measurement system according to claim 2, characterized in that: A connecting pipe is arranged obliquely on the top of the frame. The connecting pipe is a hollow structure and is used for allowing an external spotlight to pass through the inner cavity of the connecting pipe to illuminate the scale.

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