A flatness and straightness measuring device and its use method

Abstract

The present invention relates to the technical field of straightness and flatness measurement, and discloses a flatness straightness measuring device and a method for using the same, wherein the measuring device comprises: an instrument base, a rotatable lever plate is arranged in the instrument base, a bearing is arranged inside the lever plate, a central axis is passed through the bearing, and a limit column is arranged at one end of the lever plate extending below the workpiece. The present invention passes two top surface columns inside the top of the limit column, and the two top surface columns are connected to a push column member. Once the limit column reaches the edge chamfer position of the workpiece during movement, the limit column close to this edge will instantly extend, and this extending action will trigger a signal to control a warning light to light up to remind the staff to stop moving the measuring device, thereby preventing errors caused by chamfering, thereby improving the accuracy of the measurement, and the immediate reminder of the warning light allows the staff to respond quickly to avoid measuring at the wrong position, thereby saving time and manpower.

Description

Technical Field

[0001] The present invention relates to the field of straightness and flatness measurement, and more specifically, to a flatness and straightness measuring device and a use method thereof. Background Art

[0002] In recent years, my country's bearing technology has developed rapidly. In response to my country's strategic goal of "independent and controllable manufacturing of high-end bearings", the research and development, processing and testing of bearings are developing rapidly. In the measurement of bearing flatness and straightness, in addition to the use of precision equipment (such as CMM, laser interferometer, etc.), the more commonly used traditional and convenient methods are the ruler method, the light gap method, etc.

[0003] Wipe the platform to make sure that there is no dust or impurities on the platform, place the workpiece on the pad, translate the assembled portable measuring device, install the bearing in the workpiece to be tested, move the limit column to the lower end surface of the workpiece where the bearing is installed, and drag the portable measuring device along the radial direction of the workpiece to make the measuring head pass through the bearing surface and the workpiece surface to measure the flatness and straightness between the bearing and the workpiece. The difference between the maximum and minimum values ​​of the dial indicator reading is the straightness;

[0004] The chamfered portion of the edge of the workpiece is not the plane or straight area required for measurement, and changes in its shape and size will interfere with the accuracy of the measurement process. When the limit column contacts and moves along the chamfer, the force state of the lever will change due to the inclination of the chamfer, which will in turn affect the reading of the dial indicator. If the limit column moves to the chamfered edge position of the workpiece and does not stop moving in time, measurement errors will occur. For this reason, we propose a flatness and straightness measuring device and a method for using the same. Summary of the invention

[0005] The present invention provides a flatness and straightness measuring device and a method for using the same, which solve the technical problem in the related art that a limit column moves to an edge chamfer position of a workpiece and fails to stop moving in time, which may cause measurement errors.

[0006] The first aspect of the present invention provides a flatness and straightness measuring device, which is used for measuring the flatness and straightness of a workpiece; the measuring device comprises: an instrument seat, a rotatable lever plate is arranged in the instrument seat, and a limit column is arranged at one end of the lever plate extending below the workpiece;

[0007] Two sets of edge detection mechanisms are arranged on the limit column, and the edge detection mechanisms include a top column, an early warning component and a column push component. The top of the top column is connected with a top head by a thread, and the top column is connected to the column push component. The column push component includes a water pressure block, and the early warning component is triggered by the water pressure block descending.

[0008] A marking mechanism is provided inside the top surface head, which includes a soft rubber ball and a lever control part. The outer surface of the soft rubber ball is provided with several circles of marking tapes. The lever control part is connected to the soft rubber ball, and is pushed out of the top surface head by the lever control part as the lever plate rotates to draw lines on the surface of the workpiece.

[0009] Furthermore, a dial indicator is arranged above the end of the lever plate away from the limit column. The dial indicator runs through the instrument base, and the measuring end of the dial indicator contacts the upper surface of the lever plate. A limit head with a diameter smaller than the limit column is fixed at the top of the limit column, and two top surface columns are located on both sides of the moving direction of the limit head.

[0010] Furthermore, the push column member also includes a control box, a liquid storage box 1 is fixedly arranged inside the control box, a floating push plate is slidably arranged inside the liquid storage box 1, and the top column is fixedly connected to the floating push plate.

[0011] Furthermore, a liquid storage box 2 fixedly connected to the control box is provided on one side of the liquid storage box 1, a water pressure block is slidably provided inside the liquid storage box 2, liquid is injected below the water pressure block inside the liquid storage box 2, and the height of the liquid is higher than the height of the liquid storage box 1, the lower end of the liquid storage box 1 is communicated with the lower end of the liquid storage box 2 through a pipe, and the top of the liquid storage box 1 is communicated with the top of the liquid storage box 2 through an airway.

[0012] Furthermore, the early warning component includes a control switch fixed on the internal top wall of the second liquid storage box, the control end of the control switch is connected to a switch pull wire, and the end of the switch pull wire away from the control switch is fixedly connected to the water pressure block, the connecting end of the control switch is connected to a control wire, and a warning light is provided at the end of the control wire away from the limit column.

[0013] Furthermore, the lever control component includes a lifting block below the soft rubber ball, an expansion seat is fixedly arranged below the lifting block, the interior of the soft rubber ball is hollow, and ink is filled in the hollow core of the soft rubber ball, and at the same time, the thread ends of several circles of marking tape are in contact with the ink.

[0014] Furthermore, the air inlet end of the expansion seat is fixedly connected to a connecting column, and the end of the connecting column away from the expansion seat is connected to an air outlet head, the air outlet head is fixedly connected to the inside of the top surface column, and the air outlet head, the connecting column and the expansion seat are interconnected.

[0015] Furthermore, the air inlet end of the air outlet head is connected to a ventilation pipe, and the end of the ventilation pipe away from the air outlet head is connected to an air storage bag, which is fixed on the side wall of the bearing. The air storage bag is interconnected with the air outlet head through the ventilation pipe, and the ventilation pipe passes through the top column and the limit column in sequence.

[0016] Furthermore, a central axis is passed through the bearing, and two swing plates are fixedly provided at a position of the central axis close to the bearing, and the two swing plates rotate to squeeze the air storage airbag.

[0017] A second aspect of the present invention provides a method for using a flatness and straightness measuring device, comprising the following steps:

[0018] S1. Place the workpiece on the pad, adjust the initial position of the lever plate, and ensure that the limit column and the edge detection mechanism thereon can smoothly contact and scan the edge of the workpiece;

[0019] S2. Confirm that the measuring end of the dial indicator is in good contact with the upper surface of the lever plate, and adjust the dial indicator to align the 0 scale on the dial;

[0020] S3. Drag the measuring device along the radial direction of the workpiece. The difference between the maximum and minimum values ​​of the dial indicator reading is the straightness.

[0021] S4, the top surface head follows the edge of the workpiece, the water pressure block descends in the liquid storage box 2, the liquid in the liquid storage box 2 flows into the liquid storage box 1, and the top surface column reaching the edge of the workpiece is pushed up by the floating push plate. When the water pressure block descends to the preset height, it also pulls the switch pull wire to trigger the control switch, and the control switch activates the warning light through the control wire to send out an alarm signal;

[0022] S5. As the rotation angle of the lever plate changes, the lever control part pushes the soft rubber ball out of the top head. The ink inside the soft rubber ball leaves clear lines on the surface of the workpiece through the marking tape, marking the flatness and straightness of the workpiece.

[0023] The beneficial effects of the present invention are:

[0024] The present invention has two top surface columns penetrated inside the top of the limit column, and the two top surface columns are connected to the push column member. Once the limit column reaches the edge chamfer position of the workpiece during movement, the limit column close to this edge will instantly extend. This extension action will trigger a signal, and then control a warning light to light up to remind the staff to stop moving the measuring equipment, which can prevent errors caused by chamfering, thereby improving the accuracy of measurement. The instant reminder of the warning light can allow the staff to react quickly and avoid measuring at the wrong position, thereby saving time and manpower.

[0025] A soft rubber ball is designed on the top of the two limit columns, and the outer wall of the soft rubber ball is wrapped with a marking tape for marking. When the limit column measures the lower surface of the workpiece, the soft rubber ball contacts the workpiece surface. If the flatness of the workpiece surface is greater, the sliding contact area of ​​the soft rubber ball on the workpiece surface will be larger, resulting in thicker markings left by the marking tape on the workpiece. This design can provide an intuitive reference for staff to evaluate the flatness of the workpiece surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0027] Figure 2It is a schematic diagram of the three-dimensional structure of the instrument base body of the present invention;

[0028] Figure 3 It is a schematic diagram of the overall right side structure of the present invention;

[0029] Figure 4 The present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0030] Figure 5 It is a schematic diagram of the limit column structure of the present invention;

[0031] Figure 6 It is a schematic diagram of the internal structure of the limiting column of the present invention;

[0032] Figure 7 It is a schematic diagram of the internal structure of the control box of the present invention;

[0033] Figure 8 It is a schematic diagram of the top head structure of the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the soft rubber ball of the present invention.

[0035] In the figure: 11, instrument base; 12, dial indicator; 13, lever plate; 14, bearing; 15, center axis; 16, limit column; 2, edge detection mechanism; 21, top column; 22, limit head; 23, control box; 24, top head; 25, liquid storage box one; 26, floating push plate; 27, liquid storage box two; 28, water pressure block; 29, control switch; 201, switch pull wire; 202, control wire; 3, marking mechanism; 31, swing plate; 32, air storage bag; 33, ventilation pipe; 34, air outlet head; 35, lifting block; 36, expansion seat; 37, soft rubber ball; 38, connecting column; 39, marking tape; 4, cushion block; 5, workpiece; 6, warning light. DETAILED DESCRIPTION

[0036] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples. Embodiment 1

[0037] like Figure 1As shown, the first aspect of the present invention provides a flatness and straightness measuring device, which is used for measuring the flatness and straightness of a workpiece 5, and two cushion blocks 4 are placed below the workpiece 5; the measuring device comprises: an instrument base 11, a rotatable lever plate 13 is provided in the instrument base 11, a bearing 14 is provided inside the lever plate 13, a central axis 15 is passed through the bearing 14, and a limiting column 16 is provided at one end of the lever plate 13 extending below the workpiece 5;

[0038] like Figure 2 , Figure 3 and Fig. 9 As shown, two sets of edge detection mechanisms 2 are arranged on the limit column 16, and the edge detection mechanism 2 includes a top column 21, an early warning component and a push column component. The top of the top column 21 is connected with a top head 24 through a thread, and the top column 21 is connected to the push column component. The push column component includes a water pressure block 28. The water pressure block 28 descends as the top head 24 moves to the edge of the workpiece 5, and the early warning component is pulled to sound an alarm by the descent of the water pressure block 28.

[0039] A marking mechanism 3 is provided inside the top surface head 24, and the marking mechanism 3 includes a soft rubber ball 37 and a lever control component. The outer surface of the soft rubber ball 37 is provided with a plurality of circles of marking tapes 39. The two ends of the lever control component are respectively connected to the central axis 15 and the soft rubber ball 37. The soft rubber ball 37 is pushed out of the top surface head 24 by the lever control component as the lever plate 13 rotates, and a line is drawn on the surface of the workpiece 5.

[0040] The height of the pad 4 is H1, and the distance from the limit column 16 to the platform when it is horizontal with the lever plate 13 is H2. The height of the pad 4 is repaired so that H1≈H2. The distance from the center of the central axis 15 to the center of the limit column 16 is L1, and the distance from the center of the central axis 15 to the center of the dial indicator 12 is L2. The position of the limit column 16 is adjusted so that L1=L2, the distance from the center of the central axis 15 to the end face of the lever plate 13 is L3, and the distance from the center of the central axis 15 to the other end face of the lever plate 13 is L4. The position of the limit column 16 is adjusted so that L3 <L4。

[0041] Two top surface columns 21 are arranged inside the top of the limit column 16, and the two top surface columns 21 are connected to the push column member. Once the limit column 16 reaches the edge chamfering position of the workpiece 5 during the movement, the limit column 16 close to this edge will be instantly extended. This extension action will trigger a signal, and then control a warning light 6 to light up to remind the staff to stop moving the measuring equipment, which can prevent errors caused by chamfering, thereby improving the accuracy of measurement. The instant reminder of the warning light 6 allows the staff to react quickly and avoid measuring at the wrong position, thereby saving time and manpower;

[0042] A soft rubber ball 37 is designed on the top of the two limit posts 16, and the outer wall of the soft rubber ball 37 is wrapped with a marking tape 39 for marking. When the limit post 16 measures the lower surface of the workpiece 5, the soft rubber ball 37 contacts the surface of the workpiece 5. If the flatness of the surface of the workpiece 5 is greater, the sliding contact area of ​​the soft rubber ball 37 on the surface of the workpiece 5 will be larger, resulting in thicker markings left by the marking tape 39 on the workpiece 5. This design can provide an intuitive reference for the staff to evaluate the flatness of the surface of the workpiece 5.

[0043] like Figure 7 and Figure 8 As shown, a dial indicator 12 is arranged above one end of the lever plate 13 away from the limit column 16, the dial indicator 12 passes through the instrument base 11, and the measuring end of the dial indicator 12 contacts the upper surface of the lever plate 13, and a limit head 22 with a diameter smaller than the limit column 16 is fixedly arranged on the top of the limit column 16, and two top surface columns 21 are located on both sides of the moving direction of the limit head 22.

[0044] The push column component also includes a control box 23 located inside the limit column 16 and fixedly connected thereto, a liquid storage box 25 is fixedly arranged inside the control box 23, a floating push plate 26 is slidably arranged inside the liquid storage box 25, and the top column 21 passes through the control box 23 and the liquid storage box 25 in sequence from top to bottom and is fixedly connected to the floating push plate 26.

[0045] A liquid storage box 27 fixedly connected to the control box 23 is provided on one side of the liquid storage box 1 25, and a water pressure block 28 is slidably provided inside the liquid storage box 27. Liquid is injected below the water pressure block 28 inside the liquid storage box 27, and the height of the liquid is higher than the height of the liquid storage box 1 25. The lower end of the liquid storage box 1 25 is communicated with the lower end of the liquid storage box 27 through a pipeline, and the top of the liquid storage box 1 25 is communicated with the top of the liquid storage box 27 through an airway.

[0046] like Figure 5 and Figure 6 As shown, the warning component includes a control switch 29 fixed on the inner top wall of the liquid storage box 27, the control end of the control switch 29 is connected to a switch pull wire 201, and the end of the switch pull wire 201 away from the control switch 29 is fixedly connected to the water pressure block 28, the connecting end of the control switch 29 is connected to a control wire 202, and the end of the control wire 202 away from the limit column 16 is provided with a warning light 6.

[0047] When the limiting column 16 moves along the radial direction of the workpiece 5 to the edge of the workpiece 5, the top column 21 close to the edge of the workpiece 5 loses the obstruction of the lower surface of the workpiece 5. Because the height of the liquid in the second liquid storage box 27 is greater than that in the first liquid storage box 25, under the action of water pressure, the liquid in the second liquid storage box 27 flows into the first liquid storage box 25 from below. At this time, under the push of the liquid in the first liquid storage box 25, the floating push plate 26 rises, and the top column 21 is pushed up by the floating push plate 26.

[0048] When the top column 21 rises to a preset height, it indicates that the limit column 16 has moved to the edge of the workpiece 5 and cannot move further. At this time, the water pressure block 28 moves downward as the liquid level in the liquid storage box 27 drops. The switch pull wire 201 is pulled by the water pressure block 28 to trigger the control switch 29. The control switch 29 activates the warning light 6 through the control wire 202 to send out an alarm signal.

[0049] The two top surface columns 21 each correspond to a group of column pushing members, and the two top surface columns 21 correspond to two directions respectively.

[0050] like Figure 3 and Figure 4 As shown, the lever control component includes a lifting block 35 fixed below the soft rubber ball 37 inside the top head 24, and an expansion seat 36 is fixed below the lifting block 35. The inside of the soft rubber ball 37 is hollow, and the hollow core of the soft rubber ball 37 is filled with ink. At the same time, the thread ends of several circles of marking tape 39 are in contact with the ink.

[0051] The air inlet end of the expansion seat 36 is fixedly connected to a connecting column 38, and the end of the connecting column 38 away from the expansion seat 36 is connected to an air outlet head 34, the air outlet head 34 is fixedly connected to the inside of the top column 21, and the air outlet head 34, the connecting column 38 and the expansion seat 36 are interconnected.

[0052] The air inlet end of the air outlet head 34 is connected to a vent pipe 33, and the end of the vent pipe 33 away from the air outlet head 34 is connected to an air storage bag 32. The air storage bag 32 is fixed on the side wall of the bearing 14. The air storage bag 32 is interconnected with the air outlet head 34 through the vent pipe 33, and the vent pipe 33 passes through the top column 21 and the limit column 16 in sequence.

[0053] Two swing plates 31 are fixedly provided at the position of the middle shaft 15 near the bearing 14 . The two swing plates 31 rotate clockwise and counterclockwise to squeeze the two air storage bags 32 respectively.

[0054] In the initial state, the two top heads 24 are tightly attached to the lower surface of the workpiece 5. At this time, the two soft rubber balls 37 do not extend out of the top heads 24 to contact the lower surface of the workpiece 5. If the moving direction of the limit column 16 is uneven, when the index of the dial indicator 12 is greater than 0 degrees, the lever plate 13 rotates, and the two swing plates 31 rotate accordingly, and one of them squeezes one of the two air storage bags 32. The greater the rotation angle of the lever plate 13, the more gas is squeezed out of the air storage bag 32.

[0055] The gas squeezed out of the gas storage bag 32 flows into the gas outlet 34 through the vent pipe 33, flows into the connecting column 38 through the gas outlet 34, and finally flows into the expansion seat 36. As the amount of gas in the expansion seat 36 increases, the expansion seat 36 gradually expands. Through the expansion of the expansion seat 36, the lifting block 35 is pushed up, and the soft rubber ball 37 is pushed upward. Several circles of the marking tape 39 are squeezed along with the soft rubber ball 37. The greater the squeezing force, the more circles of the marking tape 39 contact the lower surface of the workpiece 5, so that the thicker the marking line.

[0056] The soft rubber balls 37 in the two top surface heads 24 correspond to different air storage bags 32 respectively. When the index of the dial indicator 12 is less than 0 degrees, the lever plate 13 rotates in the other direction to squeeze the other air storage bag 32 and draw a line. The lines drawn by the soft rubber balls 37 in the two top surface heads 24 are different in color, which is more conducive to observation by the staff. Embodiment 2

[0057] A second aspect of the present invention provides a method for using a flatness and straightness measuring device, comprising the following steps:

[0058] S1. Place the workpiece 5 on the cushion block 4, adjust the initial position of the lever plate 13, and ensure that the limit column 16 and the edge detection mechanism 2 thereon can smoothly contact and scan the edge of the workpiece;

[0059] S2. Confirm that the measuring end of the dial gauge 12 is in good contact with the upper surface of the lever plate 13, and adjust the dial gauge 12 so that the dial is aligned with the 0 scale;

[0060] S3, drag the measuring device along the radial direction of the workpiece 5, and the difference between the maximum and minimum values ​​of the dial indicator 12 reading is the straightness;

[0061] S4, the top surface head 24 follows the edge of the workpiece 5, the water pressure block 28 descends in the liquid storage box 27, the liquid in the liquid storage box 27 flows into the liquid storage box 1 25, and the top surface column 21 reaching the edge of the workpiece 5 is pushed up by the floating push plate 26. The water pressure block 28 descends to the preset height and also pulls the switch pull wire 201 to trigger the control switch 29. The control switch 29 activates the warning light 6 through the control wire 202 to send out an alarm signal;

[0062] S5. As the rotation angle of the lever plate 13 changes, the lever control member pushes the soft rubber ball 37 out of the top head 24. The ink inside the soft rubber ball 37 leaves clear lines on the surface of the workpiece 5 through the marking tape 39, marking the flatness and straightness of the workpiece 5. Embodiment 3

[0063] Wipe the platform to make sure there is no dust or impurities on the platform;

[0064] Evenly distribute equal-height pads 4 around the platform;

[0065] Place the workpiece 5 on the cushion block 4, translate the assembled portable measuring device, and move the limit column 16 to the lower end surface of the workpiece 5;

[0066] Adjust the dial indicator 12 so that the dial is aligned with the 0 scale;

[0067] Drag the portable measuring device along the radial direction of the workpiece 5, and the difference between the maximum and minimum values ​​of the dial indicator 12 reading is the straightness;

[0068] The portable measuring device is dragged at multiple points on the lower end surface of the workpiece 5, and the maximum and minimum values ​​are the flatness.

[0069] Note: When dragging the portable measuring device, avoid touching the pad 4 and avoid measuring the chamfer position of the workpiece 5. At the same time, when between two pads 4, the limit column 16 should not leave the lower end surface as much as possible.

[0070] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A flatness and straightness measuring device, used for measuring the flatness and straightness of a workpiece (5); characterized in that: The measuring device comprises: an instrument base (11), a rotatable lever plate (13) being provided in the instrument base (11), and a limiting column (16) being provided at one end of the lever plate (13) extending below the workpiece (5); Two sets of edge detection mechanisms (2) are arranged on the limit column (16), the edge detection mechanism (2) comprises a top column (21), an early warning component and a column push component, the top of the top column (21) is connected to a top head (24) via a thread, the top column (21) is connected to the column push component, the column push component comprises a water pressure block (28), and the early warning component is triggered by the water pressure block (28) descending; A marking mechanism (3) is provided inside the top surface head (24), the marking mechanism (3) comprising a soft rubber ball (37) and a lever control member, a plurality of marking bands (39) are provided on the outer surface of the soft rubber ball (37), the lever control member is connected to the soft rubber ball (37), and is pushed out of the top surface head by the lever control member as the lever plate (13) rotates, thereby marking a line on the surface of the workpiece (5); The lever control member comprises a lifting block (35) below the soft rubber ball (37), an expansion seat (36) is fixedly arranged below the lifting block (35), the inside of the soft rubber ball (37) is hollow, and ink is filled in the hollow of the soft rubber ball (37), and the thread ends of a plurality of circles of marking tapes (39) are in contact with the ink; The air inlet end of the expansion seat (36) is fixedly connected to a connecting column (38), and one end of the connecting column (38) away from the expansion seat (36) is connected to an air outlet head (34), the air outlet head (34) is fixedly connected to the inside of the top surface column (21), and the air outlet head (34), the connecting column (38) and the expansion seat (36) are interconnected; The air inlet end of the air outlet head (34) is connected to a vent pipe (33), one end of the vent pipe (33) away from the air outlet head (34) is connected to an air storage bag (32), a bearing (14) is provided inside the limiting column (16), the air storage bag (32) is fixed on the side wall of the bearing (14), the air storage bag (32) is communicated with the air outlet head (34) through the vent pipe (33), and the vent pipe (33) passes through the top column (21) and the limiting column (16) in sequence; A central shaft (15) is passed through the bearing (14), and two swing plates (31) are fixedly arranged at a position of the central shaft (15) close to the bearing (14). The two swing plates (31) rotate to squeeze the air storage bag (32).

2. A flatness and straightness measuring device according to claim 1, characterized in that: A dial indicator (12) is arranged above one end of the lever plate (13) away from the limit column (16); the dial indicator (12) penetrates the instrument base (11), and the measuring end of the dial indicator (12) contacts the upper surface of the lever plate (13); a limit head (22) having a smaller diameter than the limit column (16) is fixedly arranged at the top end of the limit column (16); and the two top surface columns (21) are located on both sides of the moving direction of the limit head (22).

3. A flatness and straightness measuring device according to claim 1, characterized in that: The push column member further comprises a control box (23), a liquid storage box (25) is fixedly arranged inside the control box (23), a floating push plate (26) is slidably arranged inside the liquid storage box (25), and the top column (21) is fixedly connected to the floating push plate (26).

4. A flatness and straightness measuring device according to claim 3, characterized in that: A second liquid storage box (27) fixedly connected to the control box (23) is provided on one side of the first liquid storage box (25); a water pressure block (28) is slidably provided inside the second liquid storage box (27); liquid is injected below the water pressure block (28) inside the second liquid storage box (27); and the height of the liquid is higher than the height of the first liquid storage box (25); the lower end of the first liquid storage box (25) is communicated with the lower end of the second liquid storage box (27) through a pipeline; and the top end of the first liquid storage box (25) is communicated with the top end of the second liquid storage box (27) through an airway.

5. A flatness and straightness measuring device according to claim 4, characterized in that: The warning component comprises a control switch (29) fixed to the top wall of the second liquid storage box (27); a control end of the control switch (29) is connected to a switch pull wire (201); an end of the switch pull wire (201) away from the control switch (29) is fixedly connected to a water pressure block (28); a connection end of the control switch (29) is connected to a control wire (202); and an end of the control wire (202) away from the limit column (16) is provided with a warning light (6).

6. A method for using the flatness and straightness measuring device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Place the workpiece (5) on the cushion block (4), adjust the initial position of the lever plate (13), and ensure that the limit column (16) and the edge detection mechanism (2) thereon can smoothly contact and scan the edge of the workpiece; S2. Confirm that the measuring end of the dial indicator (12) is in good contact with the upper surface of the lever plate (13), and adjust the dial indicator (12) so that the 0 scale on the dial is aligned; S3, drag the measuring device along the radial direction of the workpiece (5), and the difference between the maximum and minimum values ​​of the dial indicator reading is the straightness; S4, the top surface head (24) follows the edge of the workpiece (5), the water pressure block (28) descends in the second liquid storage box (27), the liquid in the second liquid storage box (27) flows into the first liquid storage box (25), and the top surface column (21) reaching the edge of the workpiece (5) is pushed up by the floating push plate (26), and the water pressure block (28) descends to a preset height and also pulls the switch pull wire (201), triggering the control switch (29), and the control switch (29) activates the warning light (6) through the control wire (202), and sends out an alarm signal; S5. As the rotation angle of the lever plate (13) changes, the lever control member pushes the soft rubber ball (37) out of the top head (24), and the ink inside the soft rubber ball (37) leaves clear lines on the surface of the workpiece through the marking tape (39), marking the flatness and straightness of the workpiece.

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