CN220103984U - Flatness measuring device - Google Patents

Abstract

The utility model discloses a flatness measuring device which comprises a base, upright posts, a frame, a height measuring instrument, and a horizontal cross beam and a horizontal longitudinal beam which are staggered up and down in the frame and vertically intersect with each other. The upright post is fixed on the base and protrudes upwards from the base to form a protruding part, and the frame is positioned above the base correspondingly and is assembled on the protruding part; the horizontal cross beam is also arranged on the frame in a sliding way along one of the X direction and the Y direction, and the horizontal longitudinal beam is also arranged on the frame in a sliding way along the other of the X direction and the Y direction; the height measuring instrument is respectively assembled on the horizontal cross beam and the horizontal longitudinal beam in a suspending way, the height measuring instrument on the horizontal cross beam can slide along the horizontal cross beam, the height measuring instrument on the horizontal longitudinal beam can slide along the horizontal longitudinal beam, and the top surface of the base is provided with a reference surface positioned correspondingly below the height measuring instrument; the flatness measuring device has the advantages of cost saving and good universality.

Description

Flatness measuring device

Technical Field

The present utility model relates to a measuring device, and more particularly, to a flatness measuring device suitable for measuring flatness of a product having concave and/or convex surfaces.

Background

It is known that in the flatness measurement process of a product, a product with concave and/or convex surfaces is encountered, i.e. several surfaces of the product are at the same height but are discontinuous, and there is a convex or concave position between them, so that when the flatness of several surfaces is measured, the product needs to be fixed on a special jig, and then placed on a proper position on a detection table together with the jig; then, the dial indicator is propped against one surface to be measured of the product by means of the dial indicator and a machine (such as CNC, three-dimensional elements and the like), one display data of the dial indicator is set, the data displayed on the Z axis of the machine is recorded, each height measurement is carried out on the surface to be measured, the data obtained by measuring each position are recorded, and the value of the phase difference between the highest point and the lowest point is the value of the flatness.

The efficiency of the inspection is relatively slow, since several sides of the product need to be inspected one by one and the operation of the machine and dial indicators requires specialized personnel. In addition, since the machine is expensive, an increase in measurement cost is caused.

Although the flatness measuring device for the mobile phone glass cover plate disclosed in the Chinese patent application number 201922192632.3 can realize the inspection of several surfaces of the mobile phone glass cover plate at one time so as to improve the detection efficiency; however, the flatness measuring device for the mobile phone glass cover plate disclosed in the chinese patent application No. 201922192632.3 has the defects of poor universality and relatively high cost.

Accordingly, there is a strong need for a highly versatile and cost effective flatness measurement device that overcomes one or more of the above-mentioned drawbacks.

Disclosure of Invention

The utility model aims to provide a flatness measuring device with good universality and cost saving.

To achieve the above object, the flatness measuring device of the present utility model is adapted to measure flatness of a product having a concave surface and/or a convex surface, and includes a base, a column, a frame, a height gauge, and a horizontal cross member and a horizontal longitudinal member which are staggered up and down and vertically intersect each other in the frame. The upright post is fixed on the base, the upright post also extends upwards and protrudes out of the base to form a protruding part, and the frame is positioned above the corresponding base and is assembled on the protruding part; the horizontal cross beam is also arranged on the frame in a sliding mode along one of the X direction and the Y direction, the horizontal longitudinal beam is also arranged on the frame in a sliding mode along the other one of the X direction and the Y direction, the height measuring instrument is respectively assembled on the horizontal cross beam and the horizontal longitudinal beam in a hanging mode, the height measuring instrument on the horizontal cross beam can also slide along the horizontal cross beam, the height measuring instrument on the horizontal longitudinal beam can also slide along the horizontal longitudinal beam, and the top surface of the base is provided with a reference surface positioned below the corresponding position of the height measuring instrument.

Compared with the prior art, the flatness measuring device further comprises the horizontal cross beam and the horizontal longitudinal beam which are staggered up and down and vertically intersect in the frame, the horizontal cross beam is further arranged on the frame in a sliding mode along one of the X direction and the Y direction, the horizontal longitudinal beam is further arranged on the frame in a sliding mode along the other of the X direction and the Y direction, the height measuring instrument is respectively assembled on the horizontal cross beam and the horizontal longitudinal beam in a suspended mode, the height measuring instrument on the horizontal cross beam can further slide along the horizontal cross beam, the height measuring instrument on the horizontal longitudinal beam can further slide along the horizontal longitudinal beam, and the top surface of the base is provided with a reference surface positioned below the height measuring instrument correspondingly; the design enables the height measuring instrument on the horizontal cross beam and the height measuring instrument on the horizontal longitudinal beam to carry out adaptive position adjustment according to the position of the measuring surface of the product so as to be compatible with products of different types and/or different specifications and have good universality; meanwhile, the flatness of a plurality of measuring surfaces at the same height of the product can be measured at one time by means of the height measuring instrument on the horizontal cross beam and the height measuring instrument on the horizontal longitudinal beam, and a power source for lifting the frame is not required to be configured, so that the cost can be saved.

Preferably, the two ends of the horizontal cross beam are respectively connected with the frame in a sliding manner, the two ends of the horizontal longitudinal beam are respectively connected with the frame in a sliding manner, the cross sections of the horizontal cross beam and the horizontal longitudinal beam are square, and the height measuring instrument is a digital display height meter.

Preferably, the frame has two first side frames spaced apart in the X direction and two second side frames spaced apart in the Y direction, each first side frame is provided with a Y-direction sliding groove extending horizontally in the Y direction, each second side frame is provided with an X-direction sliding groove extending horizontally in the X direction, two ends of the horizontal cross beam respectively penetrate through the corresponding one of the Y-direction sliding grooves, the Y-direction sliding grooves also block the horizontal cross beam from sliding along the Z direction, two ends of the horizontal cross beam respectively penetrate through the corresponding one of the X-direction sliding grooves, and the X-direction sliding grooves also block the horizontal cross beam from sliding along the Z direction.

Preferably, the number of the Y guide sliding grooves on each first side frame is equal to the number of the horizontal cross beams, and the number of the X guide sliding grooves on each second side frame is equal to the number of the horizontal longitudinal beams.

Preferably, the frame further has a sleeve fixedly connected with the first side frame or the second side frame, and the frame is sleeved at the protruding portion by means of the sleeve.

Preferably, the sleeve is located at the middle of the first side frame or the second side frame, and the sleeve is also located in the frame.

Preferably, the sleeve is also slidable along and/or rotatable about the projection.

Preferably, the flatness measuring device of the present utility model further includes a lock operation member that can be operated by rotation, the lock operation member passing horizontally through the sleeve and selectively abutting or disengaging from the projection, thereby locking or unlocking the frame and the projection, respectively.

Preferably, the locking operation member further horizontally passes through the first side frame or the second side frame fixedly connected with the sleeve.

Preferably, a screw counter bore is formed in the middle position of the base adjacent to the edge of the base, the screw counter bore penetrates through the base up and down, the upright post is abutted to the top surface of the base, and a screw penetrates through the screw counter bore from the lower side of the base and is in threaded connection with the upright post, so that the base and the upright post are fixed together.

Drawings

Fig. 1 is a perspective view of a flatness measuring device of the present utility model.

Fig. 2 is an exploded perspective view of the flatness measuring device shown in fig. 1.

Fig. 3 is a plan view of the flatness measuring device shown in fig. 1, as viewed in the forward direction of the X direction.

Fig. 4 is a plan view of the flatness measuring device shown in fig. 1, as viewed in the forward direction of the Y direction.

Fig. 5 is a perspective view of fig. 1 after concealing the base, post, lock operator and screw.

Fig. 6 is an exploded perspective view of fig. 5.

Fig. 7 is a perspective view showing the product and the jig on the flatness measuring device shown in fig. 1.

Fig. 8 is a perspective view of the product assembled to a fixture.

Fig. 9 is a perspective view of the product of fig. 8.

Detailed Description

In order to describe the technical content and constructional features of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1, 2, 8 and 9, the flatness measuring device 100 of the present utility model is suitable for measuring the flatness of a product 200 with concave and/or convex surfaces, the flatness of the measuring surface 210 is calculated by measuring the measuring surface 210 with the measuring surface 210 at the same height in one measurement, namely, the flatness is calculated by using the measured maximum number and the measured minimum number. Specifically, in fig. 8 and 9, as an example, four measuring surfaces 210 of the product 200 are located at the edge of the product 200, the remaining one is located at the middle of the product 200, and the measuring surfaces 210 located at the middle of the product 200 are far away from each other by more than the other three, so that two height measuring instruments 40 described below may be configured to measure the measuring surfaces 210 located at the middle of the product 200, and the other three may be correspondingly configured with one height measuring instrument 40 to improve the measurement reliability; of course, the configuration of the height measuring device 40 and the measuring surface 210 may be other according to practical needs, and is not limited to the configuration shown in fig. 8 and 9.

Referring again to fig. 6, the flatness measuring device 100 of the present utility model includes a base 10, a column 20, a frame 30, a height measuring instrument 40, and a horizontal cross member 50 and a horizontal longitudinal member 60 that are vertically staggered from each other in the frame 30. The top surface 11 of the base 10 has a datum surface 111 located correspondingly below the height gauge 40 so that all of the height gauges 40 are collectively cleared by alignment with the datum surface 111 to create good conditions for subsequent data measurements. The stand 20 is fixed to the base 10, and the base 10 provides a supporting function for the stand 20, alternatively, as an example, the base 10 may stand on an external object (e.g., ground, floor, bedplate, etc.), so that the flatness measuring device 100 of the present utility model can stand on the external object by means of the base 10; the upright 20 also extends upward, optionally, in fig. 3, as an example, the upright 20 extends upward vertically to ensure the verticality of the upright 20 and the base 10, thereby creating a good condition for improving the accuracy of data measurement, and the upright 20 also protrudes from the base 10 to form a protrusion 21; specifically, in fig. 1 and 2, as an example, the cross-sectional surface of the pillar 20 is circular, and of course, the cross-section of the pillar 20 may be designed into other shapes according to actual needs, which is not limited to the illustration in fig. 1 and 2.

Meanwhile, the frame 30 is located above the base 10 correspondingly and is fitted to the protrusion 21, and the protrusion 21 provides a supporting function to the frame 30 such that the frame 30 is suspended above the base 10 by means of the column 20, alternatively, in fig. 1 and 2, the frame 30 is located right above the base 10 as an example, so as to facilitate the arrangement of the height gauge 40 at the frame 30; of course, the arrangement relationship between the frame 30 and the base 10 may be other according to practical needs, and is not limited to the illustration in fig. 1 and 2.

Furthermore, the horizontal beam 50 is slidably disposed on the frame 30 along the Y direction, so that the horizontal beam 50 can slide on the frame 30 along the Y direction, and the position of the horizontal beam 50 on the frame 30 can be adjusted along the Y direction; the horizontal longitudinal beam 60 is also slidably arranged on the frame 30 along the X direction, so that the horizontal longitudinal beam 60 can slide on the frame 30 along the X direction, and the position of the horizontal longitudinal beam 60 on the frame 30 can be adjusted along the X direction; alternatively, in fig. 1, 2, 5 and 6, as an example, the horizontal cross beam 50 and the horizontal longitudinal beam 60 are each linear beams, which not only simplifies their structures, but also facilitates their manufacturing and processing, and of course, the shapes of the horizontal cross beam 50 and the horizontal longitudinal beam 60 may be other according to actual needs, and thus are not limited to those shown in fig. 1, 2, 5 and 6.

Finally, the height measuring instrument 40 is respectively assembled on the horizontal cross beam 50 and the horizontal longitudinal beam 60 in a suspending manner, so that the height measuring instrument 40 on the horizontal cross beam 50 can be suspended above the base 10 besides being supported by the horizontal cross beam 50; also, the height gauge 40 on the horizontal longitudinal beam 60 can be suspended above the base 10 in addition to being supported by the horizontal longitudinal beam 60; and the height gauge 40 on the horizontal beam 50 can also slide along the horizontal beam 50 so that the height gauge 40 on the horizontal beam 50 can be adjusted on the horizontal beam 50; the height gauge 40 on the horizontal stringers 60 may also slide along the horizontal stringers 60 so that the height gauge 40 on the horizontal stringers 60 may be adjusted on the horizontal stringers 60. Thus, the flatness measuring device 100 of the present utility model can be compatible with flatness measurements of different types and/or sizes of products 200 by sliding adjustment of the height gauge 40 on the horizontal cross member 50 in the X direction, by sliding adjustment of the height gauge 40 on the horizontal cross member 60 in the Y direction, by sliding adjustment of the horizontal cross member 50 with the height gauge 40 thereon in the Y direction on the frame 30, and by sliding adjustment of the horizontal cross member 60 with the height gauge 40 thereon in the X direction on the frame 30. More specifically, the following is:

as shown in fig. 1, 2, 5 and 6, the two ends of the horizontal beam 50 are slidably connected with the frame 30, so that the two ends of the horizontal beam 50 are slidably supported by the frame 30, and the smoothness and stability of sliding of the horizontal beam 50 on the frame 30 are improved, thereby ensuring the reliability of the height measuring instrument 40 on the horizontal beam 50 being suspended above the base 10; both ends of the horizontal longitudinal beam 60 are slidably connected with the frame 30, so that both ends of the horizontal longitudinal beam 60 are slidably supported by the frame 30, and smoothness and stability of sliding of the horizontal longitudinal beam 60 on the frame 30 are improved, thereby ensuring reliability of the height measuring instrument 40 on the horizontal longitudinal beam 60 suspended above the base 10. Specifically, in fig. 1 to 6, as an example, the frame 30 has two first side frames 31 spaced apart in the X direction and two second side frames 32 spaced apart in the Y direction, each first side frame 31 is provided with a Y-direction sliding groove 311 extending horizontally in the Y direction, and each second side frame 32 is provided with an X-direction sliding groove 321 extending horizontally in the X direction; two ends of the horizontal beam 50 are respectively penetrated in a corresponding Y-direction sliding groove 311, and the Y-direction sliding groove 311 also blocks the horizontal beam 50 from sliding along the Z direction so as to prevent the horizontal beam 50 from moving in the Z direction; the two ends of the horizontal longitudinal beam 60 are respectively penetrated in a corresponding X-direction sliding groove 321, and the X-direction sliding groove 321 also blocks the horizontal longitudinal beam 60 from sliding along the Z direction so as to prevent the horizontal longitudinal beam 60 from randomly channeling along the Z direction; in addition, the Y-guide sliding slot 311 is also convenient for the disassembly and assembly operation of the horizontal beam 50 on the first side frame 31 and the disassembly and assembly operation of the height measuring instrument 40 on the horizontal beam 50; similarly, the X-direction sliding groove 321 is used to facilitate the assembly and disassembly operations of the horizontal longitudinal beam 60 on the second side frame 32, and the assembly and disassembly operations of the height gauge 40 on the horizontal longitudinal beam 60 at the horizontal longitudinal beam 60. More specifically, in fig. 1, 2, 5 and 6, as an example, the horizontal cross members 50 are three (roots) spaced in parallel along the sliding direction thereof, the horizontal longitudinal members 60 are four (roots) spaced in parallel along the sliding direction thereof, the number of the Y-guide sliding grooves 311 on each first side frame 31 is equal to the number of the horizontal cross members 50, and the number of the X-guide sliding grooves 321 on each second side frame 32 is equal to the number of the horizontal longitudinal members 60, and the state is shown in fig. 6; of course, the number of horizontal cross members 50 and horizontal longitudinal members 60 may be other according to actual needs, and thus are not shown in fig. 1, 2, 5 and 6. For example, in fig. 3, as an example, the cross section of the horizontal beam 50 is square, so that the horizontal beam 50 is more closely matched with the Y-direction sliding slot 311, so that the horizontal beam 50 slides in the Y-direction sliding slot 311 more reliably; in fig. 4, as an example, the cross section of the horizontal girder 60 is square, so that the horizontal girder 60 is more closely matched with the X-direction sliding groove 321, and thus the horizontal girder 60 slides in the X-direction sliding groove 321 more reliably.

It is added that, as shown in fig. 6, among the three horizontal beams 50, one horizontal beam 50 is equipped with one height gauge 40 for measuring one measuring surface 210 of the product 200 located at the edge, and the other horizontal beam 50 is equipped with two height gauges 40 for measuring the measuring surface 210 of the product 200 located at the middle; of the four horizontal stringers 60, only two horizontal stringers 60 are each equipped with a height gauge 40 to correspondingly measure the remaining two measuring surfaces 210 of the product 200 at the edges; in addition, the number of the height measuring devices 40 is determined by the number of the measuring surfaces 210 of the product 200 and the area of the measuring surfaces 210, and their corresponding relationships are flexibly selected according to actual needs in the art, so that the detailed description is omitted herein.

As shown in fig. 1 to 3 and fig. 5 to 6, the frame 30 further has a sleeve 33 fixedly connected to the second side frame 32, and the frame 30 is sleeved at the protruding portion 21 by means of the sleeve 33, so as to effectively reduce the matching position of the frame 30 and the upright post 20, and thus reduce the influence of the matching position on the opening of the X-guide sliding chute 321 on the second side frame 32. Specifically, in fig. 1 to 3, and fig. 5 to 6, as an example, the sleeve 33 is located at the middle of the second side frame 32, and the sleeve 33 is also located in the frame 30, so as to ensure the reliability of supporting the frame 30 by the upright 20, and avoid the defect that the up-down inclination of the frame 30 is caused by uneven supporting of the frame 30 by the upright 20; in addition, the sleeve 33 can slide along the protruding part 21 and rotate around the protruding part 21 so as to meet the sliding and rotating of the frame 30 together with the horizontal cross beam 50, the horizontal longitudinal beam 60 and the height measuring instrument 40 thereon relative to the base 10, thereby improving the measuring flexibility of the flatness measuring device 100 of the present utility model; of course, the sleeve 33 may be slid along the projection 21 or rotated about the projection 21 as desired. More specifically, in fig. 1 to 3, as an example, the flatness measuring device 100 of the present utility model further includes a lock operation member 70 that can be rotationally operated, the lock operation member 70 passing horizontally through the second side frame 32 and the sleeve 33 and selectively abutting against or disengaging from the protruding portion 21, thereby locking the frame 30 and the protruding portion 21 together or disengaging the locking of the frame 30 and the protruding portion 21, respectively; therefore, the locking operation member 70 facilitates the adjustment and locking operation of the frame 30 by the operator. For example, the lock operation member 70 may be, but is not limited to, a screw. It should be noted that, according to actual needs, the sleeve 33 may be fixedly connected to the first side frame 31, and at this time, the lock operation member 70 horizontally passes through the first side frame 31 and the sleeve 33 and then selectively abuts against or disengages from the protruding portion 21.

As shown in fig. 1, 2 and 7, a screw counter bore 13 is formed in the middle of the base 10 adjacent to the edge 12 thereof, the screw counter bore 13 penetrates through the base 10 up and down, the upright post 20 is abutted with the top surface 11 of the base 10, and a screw 80 penetrates through the screw counter bore 12 from the lower side of the base 10 and is in threaded connection with the upright post 20, so that the base 10 and the upright post 20 are fixed together; this design simplifies the mounting relationship between the post 20 and the base 10 and also provides the advantage of being removable from the post 20 to the base 10. For example, the base 10 may be a marble structure, and the pillars 20 may be impermeable steel pillars, but not limited thereto; the reference surface 111 may be formed by the entire top surface 11 of the base 10, or may be formed by a part of the top surface 11 of the base 10.

The working principle of the flatness measuring device of the present utility model will be described with reference to the accompanying drawings: the locking operation member 70 is released, so that the frame 30, the horizontal cross beam 50, the horizontal longitudinal beam 60 and the height measuring instrument 40 on the frame 30 slide downwards until all the height measuring instruments 40 are aligned with the reference surface 111 to be zero; next, the lock operation member 70 is tightened to fix the frame 30 to the column 20; next, the product 200 is placed on the jig 300, and the jig 300 with the product 200 is placed at a corresponding position on the top surface 11 of the base 10; then, the pointers of the four height gauges 40 are placed on the corresponding measuring surfaces 210 of the product 200, and the number of the height gauges 40 is observed, and the flatness of the product 200 is obtained by subtracting the minimum number from the maximum number. The positions of the horizontal cross member 50, the horizontal longitudinal member 60 and the height measuring instrument 40 can be flexibly adjusted during the measurement process.

Compared with the prior art, since the flatness measuring device 100 of the present utility model further comprises the horizontal beam 50 and the horizontal beam 60 which are staggered up and down and vertically intersect each other in the frame 30, the horizontal beam 50 is further slidably disposed on the frame 30 along one of the X direction and the Y direction, the horizontal beam 60 is further slidably disposed on the frame 30 along the other of the X direction and the Y direction, the height measuring instrument 40 is respectively mounted on the horizontal beam 50 and the horizontal beam 60 in a suspended manner, the height measuring instrument 40 on the horizontal beam 50 can further slide along the horizontal beam 50, the height measuring instrument 40 on the horizontal beam 60 can further slide along the horizontal beam 60, and the top surface 11 of the base 10 has the reference surface 111 located correspondingly below the height measuring instrument 40; the design ensures that the height measuring instrument 40 on the horizontal cross beam 50 and the height measuring instrument 40 on the horizontal longitudinal beam 60 can adaptively adjust the position according to the position of the measuring surface 210 of the product 200 so as to be compatible with products 200 with different types and/or different specifications and have good universality; meanwhile, the flatness of a plurality of measuring surfaces 210 at the same height of the product 200 can be measured at one time by means of the height measuring instrument 40 on the horizontal cross beam 50 and the height measuring instrument 40 on the horizontal longitudinal beam 60, and a power source for lifting the frame 30 is not required to be configured, so that the cost can be saved.

It should be noted that, according to actual needs, the sliding direction of the horizontal cross beam 50 may be exchanged with the sliding direction of the horizontal longitudinal beam 60, that is, the positions of the horizontal cross beam 50 and the horizontal longitudinal beam 60 in the drawings are exchanged; alternatively, the altimeter 40 may be a digital altimeter.

The foregoing disclosure is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims (10)

1. The utility model provides a flatness measurement device, is applicable to the measurement and has concave and/or convex product flatness, includes base, stand, frame and height measurement appearance, the stand is fixed in the base, the stand still upwards extends and the protrusion the base is in order to form a protrusion, the frame is located the base corresponds the top and assemble in the protrusion, its characterized in that, flatness measurement device still includes the horizontal cross beam and the horizontal longeron that stagger each other from top to bottom and intersect perpendicularly in the frame, the horizontal cross beam still follows one of X direction and Y direction and slides in the frame, the horizontal longeron still follows one of X direction and Y direction slides in the frame, the height measurement appearance is unsettled assembly in horizontal cross beam and horizontal longeron respectively, the height measurement appearance on the horizontal cross beam still can follow the horizontal cross beam slides, the height measurement appearance on the horizontal longeron still can follow on the horizontal longeron, the top surface of base has the reference surface that is located the height measurement appearance corresponds the below.

2. The flatness measurement apparatus according to claim 1, wherein both ends of the horizontal cross member are slidably connected to the frame, both ends of the horizontal longitudinal member are slidably connected to the frame, cross sections of the horizontal cross member and the horizontal longitudinal member are square, and the height measurement instrument is a digital display height meter.

3. The flatness measurement apparatus according to claim 1, wherein the frame has two first side frames spaced apart in the X direction and two second side frames spaced apart in the Y direction, each of the first side frames is provided with a Y-direction slide-through groove extending horizontally in the Y direction, each of the second side frames is provided with an X-direction slide-through groove extending horizontally in the X direction, both ends of the horizontal cross member are respectively inserted into the corresponding one of the Y-direction slide-through grooves, the Y-direction slide-through grooves also block the horizontal cross member from sliding in the Z direction, both ends of the horizontal cross member are respectively inserted into the corresponding one of the X-direction slide-through grooves, and the X-direction slide-through grooves also block the horizontal cross member from sliding in the Z direction.

4. A flatness measuring device according to claim 3, wherein the horizontal cross members are a plurality of spaced apart in parallel along the sliding direction thereof, the horizontal side members are a plurality of spaced apart in parallel along the sliding direction thereof, the number of the Y-direction sliding grooves on each of the first side frames is equal to the number of the horizontal cross members, and the number of the X-direction sliding grooves on each of the second side frames is equal to the number of the horizontal side members.

5. A flatness measuring device according to claim 3, characterized in that the frame further has a sleeve fixedly connected to the first or second side frame, the frame being fitted at the projection by means of the sleeve.

6. The flatness measurement device of claim 5, wherein the sleeve is located at a middle of the first or second side frame, the sleeve also being located within the frame.

7. The flatness measurement device of claim 5, wherein the sleeve is further slidable along and/or rotatable about the protrusion.

8. The flatness measurement device of claim 5, further comprising a rotationally operable lock operation member that passes horizontally through the sleeve and selectively abuts or disengages the protrusion, thereby locking the frame with the protrusion or disengaging the frame from the protrusion, respectively.

9. The flatness measurement device of claim 8, wherein the lock operation member further horizontally passes through the first side frame or the second side frame fixedly connected to the sleeve.

10. The flatness measurement apparatus according to claim 1, wherein a screw counterbore is provided in a middle position of the base adjacent to an edge thereof, the screw counterbore penetrates the base up and down, the column abuts against a top surface of the base, and a screw penetrates the screw counterbore from below the base and is screwed with the column, thereby fixing the base and the column together.