Battery box cover flatness inspection tool

Abstract

A battery box cover flatness inspection tool disclosed by the present invention comprises a rack with a platen, and further comprises a carriage, a datum beam and an inspector, the carriage comprises a cross beam and sliding pieces arranged at the two ends of the cross beam respectively, the two sides of the platen are respectively provided with a sliding rail, the sliding pieces at the two ends of the cross beam are respectively installed and run on the sliding rails at the two sides of the platen, and the inspector is connected with the slide rails. The datum beam and the cross beam stretch across the middle area of the platen to be installed on the sliding frame and have the set height, during application, the battery box cover is placed on the platen below the datum beam, the detection face of the battery box cover is parallel to the sliding rail, and the detector detects the change of the distance between the datum beam and the detection face in the process that the datum beam slides along with the sliding frame. The flatness detection device has the advantages that the flatness of the detection surface of the battery box cover can be detected comprehensively, efficiently and accurately; the indicating lamp is lighted, and the result is visual; the operation is simple, whether the detection surface is qualified or not can be judged only by pushing the sliding frame from one end of the detection surface to the other end, and the unqualified position can be accurately found.

Description

Technical Field

[0001] The invention relates to a flatness inspection tool for a battery box cover, belonging to the technical field of flatness inspection. Background Art

[0002] For the battery box cover of a type of new energy vehicle battery, in order to ensure the assembly sealing between the battery box cover and the lower box body / liquid cooling plate, it is necessary to set a higher flatness requirement for the flange edge of the battery box cover, and the flatness requirement is generally 0.5~1mm. At the same time, affected by the gap between the battery box PACK and the chassis space of the whole vehicle or the internal battery module, it is necessary to set a higher flatness requirement for the large surface of the battery box cover, and the flatness requirement is 2~3mm.

[0003] At present, the flatness of the flange edge of the battery box cover is mostly measured with a steel ruler and a gap gauge. When measuring, it is necessary to select multiple positions to measure the readings one by one. The defects are: due to the influence of human readings, it is easy to have deviations and reading errors; the inspection efficiency is low and cannot meet the needs of continuous inspection in mass production. For the detection of the outer edge contour of the flange edge of the battery box cover, it is mostly converted into a form of linear dimension plus tolerance and inspected by a tape measure. The defects are: for battery box covers longer than 2m, two people are required to cooperate in the measurement, which is inefficient. For the height dimension detection of the battery box cover product, a height gauge is often used for measurement, but the height gauge can only measure the edge of the product and cannot inspect the middle of the large surface of the battery box cover.

[0004] In summary, the current inspection of the flatness of the large surface and flange edge of the battery box cover has problems such as low inspection efficiency, large and inevitable human errors, and some positions cannot be detected, which cannot support continuous inspection during mass production. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to implement efficient, accurate and full-range detection of the flatness of the large surface and flange edge of the battery box cover.

[0006] In view of the above problems, the technical solution proposed by the present invention is: A battery box cover flatness inspection tool includes a table with a table, a slide, a reference beam and an inspector, the slide includes a crossbeam and sliding members respectively arranged at both ends of the crossbeam, slide rails are respectively arranged on both sides of the table, the slide members at both ends of the crossbeam are respectively installed and run on the slide rails on both sides of the table, the reference beam and the crossbeam are installed on the slide across the middle area of ​​the table, and have a set height. When in use, the battery box cover is placed on the table under the reference beam, and its detection surface is parallel to the slide rail. When the reference beam slides with the slide, the inspector inspects the change in the spacing between the reference beam and the detection surface.

[0007] The inspection device is a go / no-go gauge, the two ends of which are a large diameter end and a small diameter end respectively. The large diameter end and the small diameter end are respectively folded in reverse in a Z shape at the two ends of the go / no-go gauge body. When used, the large diameter end and / or the small diameter end are extended between the reference beam and the detection surface to implement spacing detection.

[0008] The tester includes a fixed shaft and a plurality of pressing parts. The sliding part has a rectangular column for supporting a crossbeam. The fixed shaft is parallel to the reference beam, and its two ends are respectively fixed on the rectangular column. The front section of the pressing part is a pressing arm, and the rear section is a clamp-shaped measuring arm. The clamp-shaped measuring arm has a jaw opening facing backwards, and the jaw has an upper side wall and a lower side wall. An axial hole communicating left and right is provided between the pressing arm and the clamp-shaped measuring arm. All the pressing parts are mounted on the fixed shaft through the axial hole and can rotate independently around the fixed shaft. The reference beam is located at In the jaws, the front end of the pressing arm is always pressed against the detection surface of the battery box cover under the action of force and can be dragged backward with the slide. When the flatness of the detection surface of the battery box cover is within the specified range, there are gaps between the upper side wall and the lower side wall of the jaws and the reference beam. When a raised area appears on the detection surface and the raised height exceeds the set value, the upper side wall will be pressed against the upper surface of the reference beam. When a sunken area appears on the detection surface and the sunken depth exceeds the set value, the lower side wall will be pressed against the lower surface of the reference beam.

[0009] The weight of the pressing arm is greater than the weight of the clamp-shaped measuring arm.

[0010] A roller is provided at the front end of the pressing arm, and the front end of the pressing arm is pressed against the detection surface of the battery box cover and dragged backward along with the slide, so that the roller rolls and slides against the detection surface.

[0011] The inspector also includes a light prompt mechanism, which includes a DC power supply, a circuit, and a plurality of salient indicator lights and recessed indicator lights, one salient indicator light and one recessed indicator light corresponding to a pressing piece, when the upper side wall of the jaws of a pressing piece is pressed against the upper surface of the reference beam, the salient indicator light corresponding to the pressing piece is connected to the DC power supply and lights up, and when the lower side wall of the jaws of a pressing piece is pressed against the lower surface of the reference beam, the salient indicator light corresponding to the pressing piece is connected to the DC power supply and lights up.

[0012] The circuit includes a positive line and a negative line. The positive line includes a positive main line connected to the positive pole of a DC power supply and a plurality of positive branch lines that can be connected to the positive main line. The negative line includes a negative main line connected to the negative pole of the DC power supply and a plurality of negative branch lines connected to the negative main line.

[0013] The negative main circuit is arranged in the middle of the rear side surface of the reference beam along the length direction of the reference beam, all protruding indicator lights are arranged above the negative main circuit and correspond to the positions of their respective corresponding pressing parts, all concave indicator lights are arranged below the negative main circuit and correspond to the positions of their respective corresponding pressing parts, and the negative main circuit is connected to the concave indicator lights through the negative branch circuit; the clamp-shaped measuring arm is a conductor, the positive main circuit is connected to the clamp-shaped measuring arm, and the positive branch circuit is divided into two groups, an upper and a lower group, one end of the positive branch circuit in the upper group is connected to the protruding indicator light, and the other end extends upward to the upper surface of the reference beam and forms a contact point one at the end that can overlap with the upper side wall of the jaws of the positively charged clamp-shaped measuring arm, and the positive branch circuit in the lower group is connected to the concave indicator light at one end, and the other end extends downward to the lower surface of the reference beam and forms a contact point two at the end that can overlap with the lower side wall of the jaws of the positively charged clamp-shaped measuring arm.

[0014] The inspector also includes an installation mechanism for adjusting the installation of the reference beam, the installation mechanism includes an installation groove opened on the rectangular column, a mounting frame placed in the installation groove, the mounting frame has an installation cavity, the upper and lower parts of the installation cavity are provided with buffer springs, the end of the reference beam is installed between the two buffer springs, and the height of the mounting frame in the installation groove can be adjusted.

[0015] The mounting mechanism also includes an adjusting bolt, a limiting handle is provided at the lower end of the adjusting bolt, a limiting cavity is provided at the upper part of the mounting frame, a plain bolt hole is provided on the top plate of the limiting cavity, a threaded bolt adjustment hole is provided at the end of the beam, the mounting groove is communicated with the top end surface of the rectangular column, the lower end of the adjusting bolt passes through the plain bolt hole on the top of the limiting cavity, and the limiting handle is located in the limiting cavity, the upper section of the adjusting bolt passes through the threaded bolt adjustment hole at the end of the beam in a threaded matching manner to expose the upper surface of the end of the beam, and turning the adjusting bolt can make the mounting frame rise and fall in the mounting groove of the rectangular column. Beneficial Effects

[0016] 1. It can detect the flatness of the battery box cover detection surface in an all-round, efficient and accurate manner; 2. The indicator light is bright and the result is intuitive; 3. The operation is simple. You only need to push the slide from one end of the test surface to the other end to determine whether it is qualified and accurately find the unqualified position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the battery box cover flatness inspection tool described in Example 1; Figure 2 It is a three-dimensional schematic diagram of the go / no-go gauge described in the first embodiment; Figure 3 It is a three-dimensional schematic diagram of the battery box cover flatness inspection tool described in Example 2; Figure 4 This is a three-dimensional schematic diagram of the battery box cover flatness inspection tool described in Example 2, in which the reference beam and the cross beam are not shown; Figure 5 It is a three-dimensional schematic diagram of the pressing piece described in the second embodiment; Figure 6 It is a three-dimensional schematic diagram of the flatness inspection tool for the battery box cover according to the second embodiment, in which the crossbeam is not shown; Figure 7 for Figure 6 A partial schematic diagram of the invention mainly shows the overlapping structure of the protruding indicator light and the recessed indicator light and the circuit; Figure 8 This is a schematic diagram of the circuit structure of the battery box cover flatness inspection tooling described in Example 2; Fig. 9 It is a three-dimensional schematic diagram of the mounting frame and the adjusting bolts described in the second embodiment; Fig.10 It is a three-dimensional schematic diagram of the adjusting bolt described in the second embodiment; Fig.11 for Figure 6 A partial schematic diagram of the invention, in which no cross beam is installed, mainly showing the installation structure of the reference beam; Fig.12 for Figure 6 A partial schematic diagram of a reference beam is shown in which a crossbeam has been installed, mainly showing the adjustment structure of the reference beam.

[0018] In the figure: 1, stand; 101, table; 102, slide rail; 2, slide; 201, crossbeam; 2011, threaded bolt adjustment hole; 202, slide; 2021, rectangular column; 20211, mounting groove; 2022, linear slider; 3, reference beam; 4, go / no-go gauge; 401, large diameter end; 402, small diameter end; 5, fixed shaft; 6, pressing piece; 601, pressing arm; 6011, roller; 602, clamp-shaped measuring arm; 6021, jaw; 60211, upper side wall; 60212, lower side wall; 603, shaft hole; 7, mounting frame; 701, mounting cavity; 702, limiting cavity; 7021, plain bolt hole; 8, positive line; 801, positive main line; 802, positive branch line; 9, negative line; 901, negative main line; 902, negative branch line; 10, prominent indicator light; 11, recessed indicator light; 12, DC power supply; 13, contact point one; 14, contact point two; 15, circuit switch; 16, buffer spring; 17, adjusting bolt; 1701, limiting handle; 18, battery box cover; 1801, detection surface. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1

[0020] like Figure 1 , 2 As shown, a battery box cover flatness inspection tool includes a table 1 with a table 101, a slide 2, a reference beam 3 and an inspector, the slide 2 includes a crossbeam 201 and slide members 202 respectively arranged at both ends of the crossbeam 201, slide rails 102 are respectively arranged on both sides of the table 101, the slide members 202 at both ends of the crossbeam 201 are respectively installed and run on the slide rails 102 on both sides of the table 101, the reference beam 3 and the crossbeam 201 are installed on the slide 2 across the middle area of ​​the table 101, and have a set height. When in use, the battery box cover 18 is placed on the table 101 under the reference beam 3, and its detection surface 1801 is parallel to the slide rail 102. When the reference beam 3 slides with the slide 2, the inspector inspects the change in the spacing between the reference beam 3 and the detection surface 1801. In the process of the reference beam 3 sliding from one end of the detection surface of the battery box cover 18 to the other end, if the distance between the reference beam 3 and the detection surface 1801 changes by more than the set value, it proves that the protrusion or depression of the detection surface 1801 at that location has exceeded the flatness requirement. In this way, through the above-mentioned setting, the flatness detection of the battery box cover detection surface 1801 can be carried out efficiently, accurately and globally.

[0021] The detection surface 1801 mentioned here includes the entire top surface of the battery box cover 18 when it is buckled, and can also be the surrounding flange surface when it is opened upward (not shown in the figure, the application principle is the same).

[0022] like Figure 2 As shown, the inspection device is a go / no-go gauge 4, and the two ends of the go / no-go gauge 4 are respectively a large diameter end 401 and a small diameter end 402. The large diameter end 401 and the small diameter end 402 are respectively folded in reverse in a Z shape at the two ends of the go / no-go gauge 4 body. When used, the large diameter end 401 and / or the small diameter end 402 are extended into the space between the reference beam 3 and the detection surface 1801 to implement the spacing detection. When the small diameter end 402 can extend into the space between the reference beam 3 and the detection surface but the large diameter end 401 cannot, it proves that the flatness of the detection surface 1801 is qualified, otherwise it is unqualified. Embodiment 2

[0023] like Figure 3As shown in FIG. 6 , the tester includes a fixed shaft 5 and a plurality of pressing parts 6. The sliding part 202 has a rectangular column 2021 for supporting a crossbeam and a linear slider 2022 fixed at the bottom of the rectangular column 2021 and sliding against a rail. The fixed shaft 5 is parallel to the reference beam 3, and its two ends are respectively fixed on the rectangular column 2021. The front section of the pressing part 6 is a pressing arm 601, and the rear section is a clamp-shaped measuring arm 602. The clamp-shaped measuring arm 602 has a jaw 6021 opening backwards, and the jaw 6021 has an upper side wall 60211 and a lower side wall 60212. An axial hole 603 communicating left and right is provided between the pressing arm 601 and the clamp-shaped measuring arm 602. All the pressing parts 6 are installed on the fixed shaft 5 through the axial hole 603 and can rotate independently around the fixed shaft. The reference beam 3 is located in the jaw 6021. When in use, the front end of the pressing arm 601 is always pressed against the detection surface 1801 of the battery box cover under the action of force and can be dragged backward with the slide 2. When the flatness of the detection surface 1801 of the battery box cover is within the specified range, there are gaps between the upper side wall 60211 and the lower side wall 60212 of the jaw 6021 and the reference beam 3. When a convex area appears on the detection surface 1801 and the convex height exceeds the set value, the front end of the pressing arm 601 in the dragging will be convex. The detection surface 1801 is lifted, and the pressing piece 6 rotates around the fixed axis 5, so that the upper side wall 60211 of the clamp-shaped measuring arm 602 is pressed downward against the upper surface of the reference beam 3; when a sunken area appears on the detection surface 1801 and the sunken depth exceeds the set value, the front end of the pressing arm 601 in the dragging will sink with the sunken detection surface 1801, and the pressing piece 6 rotates around the fixed axis 5, so that the lower side wall 60212 of the clamp-shaped measuring arm 602 is pressed upward against the lower surface of the reference beam 3.

[0024] When it is found that the upper side wall 60211 of the jaw 6021 is in contact with the reference beam 3 or the lower side wall 60212 is in contact with the reference beam 3, it is proved that the detection surface 1801 does not meet the flatness requirement.

[0025] The weight of the pressing arm 601 is greater than the weight of the clamp-shaped measuring arm 602 , so that the front end of the pressing arm 601 is always pressed against the detection surface by virtue of the weight of the pressing arm 601 .

[0026] like Figure 5 , 6 As shown, further, a roller 6011 is provided at the front end of the pressing arm 601, and the front end of the pressing arm 601 is pressed against the detection surface 1801 of the battery box cover and dragged backward with the slide 2, so that the roller 6011 rolls and slides on the detection surface 1801, which can reduce the dragging resistance and avoid wear of the front end of the pressing arm and scratches on the detection surface 1801.

[0027] like Figure 6—8, further, the inspector also includes a light prompt mechanism, which includes a DC power supply 12, a circuit, and a plurality of prominent indicator lights 10 and a recessed indicator light 11, one prominent indicator light 10 and one recessed indicator light 11 corresponding to one pressing part 6, when the upper side wall 60211 of the jaws of a pressing part 6 is pressed against the upper surface of the reference beam 3, the prominent indicator light 10 corresponding to the pressing part 6 is connected to the DC power supply 12 and lights up, when the lower side wall 60212 of the jaws of a pressing part 6 is pressed against the lower surface of the reference beam 3, the prominent indicator light 10 corresponding to the pressing part 6 is connected to the DC power supply 12 and lights up.

[0028] The circuit includes a positive line 8 and a negative line 9. The positive line 8 includes a positive main line 801 connected to the positive pole of the DC power supply 12 and multiple positive branch lines 802 that can be connected to the positive main line 801. The negative line 9 includes a negative main line 901 connected to the negative pole of the DC power supply 12 and multiple negative branch lines 902 connected to the negative main line 901.

[0029] The negative main line 901 is arranged in the middle of the rear side surface of the reference beam 3 along the length direction of the reference beam 3, all the protruding indicator lights 10 are arranged above the negative main line 901 and correspond to the positions of the corresponding pressing parts 6, and all the recessed indicator lights 11 are arranged below the negative main line 901 and correspond to the positions of the corresponding pressing parts 6. The negative main line 901 is connected to the recessed indicator lights 11 through the negative branch line 902; the clamp-shaped measuring arm 602 is a conductor, the positive main line 801 is connected to the clamp-shaped measuring arm 602, and the positive branch line 80 2 is divided into two groups, an upper group, a positive branch line 802 in the upper group has one end connected to the protruding indicator light 10, and one end extends upward to the upper surface of the reference beam 3 and forms a contact point 13 at the end that can overlap with the upper side wall 60211 of the jaws 6021 of the positively charged clamp-shaped measuring arm 602; a positive branch line 802 in the lower group has one end connected to the concave indicator light 11, and one end extends downward to the lower surface of the reference beam 3 and forms a contact point 14 at the end that can overlap with the lower side wall 60212 of the jaws 6021 of the positively charged clamp-shaped measuring arm 602. When the upper side wall 60211 of the jaws 6021 of a pressing piece 6 is in contact with the reference beam 3, the positively charged upper side wall 60211 overlaps and connects with the contact point 13 on the upper surface of the reference beam 3, and the protruding indicator light 10 corresponding to the pressing piece 6 lights up, indicating that the area contacted by the pressing arm 601 of the pressing piece 6 is raised and exceeds the flatness range; when the lower side wall 60212 of the jaws 6021 of a pressing piece 6 is in contact with the reference beam 3, the positively charged lower side wall 60212 overlaps and connects with the contact point 14 on the lower surface of the reference beam 3, and the concave indicator light 11 corresponding to the pressing piece 6 lights up, indicating that the area contacted by the pressing arm 601 of the pressing piece 6 is sunken and exceeds the flatness range. In this way, by lighting up the prominent indicator light 10 or the recessed indicator light 11, it is possible to intuitively find the unqualified flatness problem existing somewhere on the detection surface 1801, and it is possible to directly express whether it is caused by depression or protrusion that is difficult to distinguish with the naked eye. Here, the contact point 13 between the upper side wall 60211 of the jaw 6021 and the upper surface of the reference beam 3 and the contact point 2 14 between the lower side wall 60212 and the lower surface of the reference beam 3 are equivalent to the circuit switch 15.

[0030] like Figure 6 , 9 As shown in Figures 10, 11 and 12, the tester also includes a mounting mechanism for adjusting the installation of the reference beam 3, the mounting mechanism includes a mounting groove 20211 opened on the rectangular column 2021, a mounting frame 7 placed in the mounting groove 20211, the mounting frame 7 has a mounting cavity 701, and the upper and lower parts of the mounting cavity 701 are provided with buffer springs 16, the end of the reference beam 3 is installed between the two buffer springs 16, and the height of the mounting frame 7 in the mounting groove 20211 can be adjusted.

[0031] Here, the end of the reference beam 3 is installed between two buffer springs 16, so that when the upper side wall 60211 or the lower side wall 60212 of the pressing member 6 is pressed against the reference beam 3, the reference beam 3 can move downward or upward appropriately.

[0032] The height of the mounting frame 7 in the mounting groove 20211 can be adjusted, and the upper and lower heights of the reference beam 3 can be adjusted, thereby adjusting the setting ratio of the raised flatness and the recessed flatness.

[0033] The mounting mechanism also includes an adjusting bolt 17, a limiting handle 1701 is provided at the lower end of the adjusting bolt 17, a limiting cavity 702 is provided on the upper part of the mounting frame 7, a plain bolt hole 7021 is provided on the top plate of the limiting cavity 702, a threaded bolt adjusting hole 2011 is provided at the end of the beam 201, and the mounting groove 20211 is communicated with the top surface of the rectangular column 2021, the lower end of the adjusting bolt 17 passes through the plain bolt hole 7021 at the top of the limiting cavity, and the limiting handle 1701 is located in the limiting cavity 702, the upper section of the adjusting bolt 17 passes through the threaded bolt adjusting hole 2011 at the end of the beam in a threaded matching manner to expose the upper surface of the end of the beam 201, and screwing the adjusting bolt 17 can make the mounting frame 7 rise and fall in the mounting groove 20211 of the rectangular column, so that the adjustment of the reference beam 3 becomes very simple.

[0034] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the protection scope of the present invention. Any modifications in equivalent forms should be regarded as falling within the protection scope of the present invention.

Claims

1. A battery box cover flatness inspection tool, comprising a stand (1) having a table (101), characterized in that: It also includes a slide (2), a reference beam (3) and a tester, wherein the slide (2) includes a crossbeam (201) and slide members (202) respectively arranged at both ends of the crossbeam (201), and slide rails (102) are respectively arranged on both sides of the table (101), and the slide members (202) at both ends of the crossbeam (201) are respectively installed and run on the slide rails (102) on both sides of the table (101), and the reference beam (3) and the crossbeam (201) are installed on the slide (2) across the middle area of ​​the table (101), and have a set height. When in use, the battery box cover (18) is placed on the table (101) under the reference beam (3), and its detection surface (1801) is parallel to the slide rail (102). When the reference beam (3) slides with the slide (2), the tester detects the change in the spacing between the reference beam (3) and the detection surface (1801).

2. The battery box cover flatness inspection tool according to claim 1, characterized in that: The inspection device is a go / no-go gauge (4), the two ends of the go / no-go gauge (4) are respectively a large diameter end (401) and a small diameter end (402), the large diameter end (401) and the small diameter end (402) are respectively folded in a Z-shape in opposite directions at the two ends of the go / no-go gauge (4) body, and when in use, the large diameter end (401) and / or the small diameter end (402) are extended into the space between the reference beam (3) and the detection surface (1801) to implement spacing detection.

3. The battery box cover flatness inspection tool according to claim 1, characterized in that: The tester comprises a fixed shaft (5) and a plurality of pressing parts (6); the sliding part (202) has a rectangular column (2021) for supporting a crossbeam; the fixed shaft (5) is parallel to the reference beam (3), and its two ends are respectively fixed on the rectangular column (2021); the front section of the pressing part (6) is a pressing arm (601), and the rear section is a clamp-shaped measuring arm (602); the clamp-shaped measuring arm (602) has a jaw (6021) opening backwards; the jaw (6021) has an upper side wall (60211) and a lower side wall (60212); a shaft hole (603) communicating left and right is provided between the pressing arm (601) and the clamp-shaped measuring arm (602); all the pressing parts (6) are mounted on the fixed shaft (5) through the shaft hole (603) and can rotate independently around the fixed shaft The reference beam (3) is located in the jaws (6021). When in use, the front end of the pressure arm (601) is always pressed against the detection surface (1801) of the battery box cover under the action of force and can be dragged backward with the slide (2). When the flatness of the detection surface (1801) of the battery box cover is within a specified range, there is a gap between the upper side wall (60211) and the lower side wall (60212) of the jaws (6021) and the reference beam (3). When a raised area appears on the detection surface (1801) and the raised height exceeds a set value, the upper side wall (60211) will be pressed against the upper surface of the reference beam (3). When a sunken area appears on the detection surface (1801) and the sunken depth exceeds a set value, the lower side wall (60212) will be pressed against the lower surface of the reference beam (3).

4. The battery box cover flatness inspection tool according to claim 3, characterized in that: The weight of the pressing arm (601) is greater than the weight of the clamp-shaped measuring arm (602).

5. The battery box cover flatness inspection tool according to claim 3, characterized in that: The front end of the pressing arm (601) is provided with a roller (6011), and the front end of the pressing arm (601) is pressed against the detection surface (1801) of the battery box cover and dragged backward along with the slide (2), so that the roller (6011) is pressed against the detection surface (1801) and rolls and slides.

6. The battery box cover flatness inspection tool according to claim 3, characterized in that: The inspector further comprises a light prompt mechanism, which comprises a DC power supply (12), a circuit, and a plurality of salient indicator lights (10) and recessed indicator lights (11), wherein one salient indicator light (10) and one recessed indicator light (11) correspond to one pressing piece (6), and when the upper side wall (60211) of the jaws of a pressing piece (6) is pressed against the upper surface of the reference beam (3), the salient indicator light (10) corresponding to the pressing piece (6) is connected to the DC power supply (12) and lights up, and when the lower side wall (60212) of the jaws of a pressing piece (6) is pressed against the lower surface of the reference beam (3), the salient indicator light (10) corresponding to the pressing piece (6) is connected to the DC power supply (12) and lights up.

7. The battery box cover flatness inspection tool according to claim 6, characterized in that: The circuit comprises a positive line (8) and a negative line (9), wherein the positive line (8) comprises a positive main line (801) connected to the positive pole of a DC power source (12) and a plurality of positive branch lines (802) capable of being connected to the positive main line (801), and the negative line (9) comprises a negative main line (901) connected to the negative pole of the DC power source (12) and a plurality of negative branch lines (902) connected to the negative main line (901).

8. The battery box cover flatness inspection tool according to claim 7, characterized in that: The negative main line (901) is arranged at the middle of the rear side surface of the reference beam (3) along the length direction of the reference beam (3); all the protruding indicator lights (10) are arranged above the negative main line (901) and correspond to the positions of their respective corresponding pressing parts (6); all the recessed indicator lights (11) are arranged below the negative main line (901) and correspond to the positions of their respective corresponding pressing parts (6); the negative main line (901) is connected to the recessed indicator lights (11) via the negative branch line (902); the clamp-shaped measuring arm (602) is a conductor; the positive main line (801) is connected to the clamp-shaped measuring arm (602); the positive branch line (902) is connected to the positive main line (801) and the positive branch line (902) is connected to the positive branch line (902); The circuit (802) is divided into two groups, an upper group and an lower group. The positive branch circuit (802) in the upper group has one end connected to the protruding indicator light (10), and one end extending upward to the upper surface of the reference beam (3) and forming a contact point one (13) at the end that can overlap with the upper side wall (60211) of the jaws (6021) of the positively charged clamp-shaped measuring arm (602). The positive branch circuit (802) in the lower group has one end connected to the recessed indicator light (11), and one end extending downward to the lower surface of the reference beam (3) and forming a contact point two (14) at the end that can overlap with the lower side wall (60212) of the jaws (6021) of the positively charged clamp-shaped measuring arm (602).

9. The battery box cover flatness inspection tool according to claim 3, characterized in that: The tester further comprises a mounting mechanism for adjusting the mounting of the reference beam (3), the mounting mechanism comprising a mounting groove (20211) formed on the rectangular column (2021), a mounting frame (7) disposed in the mounting groove (20211), the mounting frame (7) having a mounting cavity (701), buffer springs (16) being disposed at the upper and lower parts of the mounting cavity (701), the end of the reference beam (3) being mounted between the two buffer springs (16), and the height of the mounting frame (7) in the mounting groove (20211) being adjustable.

10. The battery box cover flatness inspection tool according to claim 3, characterized in that: The mounting mechanism further comprises an adjusting bolt (17), the lower end of which is provided with a limiting handle (1701), a limiting cavity (702) is provided on the upper part of the mounting frame (7), a plain bolt hole (7021) is provided on the top plate of the limiting cavity (702), a threaded bolt adjusting hole (2011) is provided on the end of the crossbeam (201), the mounting groove (20211) is communicated with the top surface of the rectangular column (2021), the lower end of the adjusting bolt (17) passes through the plain bolt hole (7021) on the top of the limiting cavity, the limiting handle (1701) is located in the limiting cavity (702), the upper section of the adjusting bolt (17) passes through the threaded bolt adjusting hole (2011) at the end of the crossbeam in a threaded matching manner to expose the upper surface of the end of the crossbeam (201), and the mounting frame (7) can be raised or lowered in the mounting groove (20211) of the rectangular column by turning the adjusting bolt (17).

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