A gap measuring caliper

Abstract

The present invention relates to a gap measuring caliper, characterized in that it comprises: a main scale and a secondary scale, a measuring scale section is provided at the lower part of the main scale, the left side of the measuring scale section is a reference elevation, a plurality of continuous measuring steps are provided at the right side of the measuring scale section, all the measuring steps are arranged continuously in the up-down direction to form a continuous step structure, the secondary scale is guided and slidably assembled on the main scale, and corresponding to each measuring step, when the secondary scale moves up and down and is adjusted to the positioning top pressure end of the secondary scale and the step plane of the measuring step, the scale indicated by the corresponding scale line indicated by the indicator is the distance between the step elevation of the same measuring step and the reference elevation. When the gap to be measured is deep, the gap measuring caliper provided by the present invention can be used to convert the measuring structure to the upper scale line, which effectively solves the technical problem in the prior art that the inspector cannot intuitively obtain the inspection result when the gap is deep.

Description

Technical Field

[0001] The invention belongs to the field of measuring and positioning tools, and in particular relates to a gap measuring caliper. Background Art

[0002] Spring pressure gauges are widely used in many fields. After a period of use, the indication may be out of tolerance and need to be adjusted. Since the pressure gauge is a precision instrument, the position accuracy of the pressure gauge movement adjustment screw in the slide slot is relatively high when adjusting the range. It is necessary to use a measuring tool to measure the horizontal distance from the adjustment screw to the end of the slide slot. In the existing technical means, the pressure gauge movement slide slot and adjustment screw are located in the pressure gauge case, which makes it impossible for conventional measuring tools to measure in-depth in the slide slot; at the same time, the top of the pressure gauge movement adjustment screw cap and the end of the slide slot are not at the same level. When the ordinary inner diameter measurement feeler gauge is used for each measurement, different angles will be formed on both sides of the feeler gauge, resulting in measurement deviation. And because both sides of the feeler gauge are inclined surfaces, they are prone to sliding, and the connecting rod limit function cannot be realized. When setting the connecting rod position of the pressure gauge movement, the operator can only rely on experience, and the success rate is low, resulting in repeated operations when adjusting the pressure gauge range.

[0003] At present, a Chinese invention patent application with authorization announcement number CN105157530A provides a stepped feeler gauge for detecting gaps. The feeler gauge includes a handle, and round pins at both ends of the handle are rotatably connected to a side gauge. Both side gauges are in a stepped shape that gradually becomes thinner from the connection end to the free end. The thickness difference between adjacent steps of the two side gauges is equal. During detection, the side gauge is extended into the gap to be tested for gap detection. It can be used for gap detection in a narrow space not exceeding 10 mm.

[0004] However, the above-mentioned feeler gauge has the following problem: since only scales are set on the gauge, when encountering a situation where the measurement gap is deep or the peripheral conditions are complex, the inspector cannot obtain the inspection result intuitively. Summary of the invention

[0005] The object of the present invention is to provide a gap measuring caliper to solve the technical problem in the prior art that only scales are set on a stepped measuring ruler, resulting in an inability of inspectors to intuitively obtain inspection results when measuring a deep gap.

[0006] To achieve the above purpose, the technical solution of the gap measuring caliper provided by the present invention is:

[0007] A gap measuring caliper, comprising:

[0008] The main scale and the secondary scale both extend in the up-down direction;

[0009] The main ruler has a measuring ruler section at its lower part;

[0010] The left and right widths of the measuring scale segment gradually decrease from top to bottom. The left side of the measuring scale segment is a reference elevation, which extends vertically up and down. The right side of the measuring scale segment is provided with a plurality of continuous measuring steps, each measuring step includes a step elevation and a step plane, the step elevation is parallel to the reference elevation, the step elevations belonging to the same measuring step are located below the step plane, and the step plane is arranged downward and perpendicular to the corresponding step elevation, and all the measuring steps are continuously arranged in the up and down direction to form a continuous step structure;

[0011] The auxiliary ruler is guided and slidably assembled on the main ruler along the up-down direction, and a positioning pressing end is provided at the bottom of the auxiliary ruler;

[0012] The main ruler and the auxiliary ruler are provided with a plurality of scale lines arranged in sequence on the upper part of one of them, and an indicator mark for use with the other is provided on the other;

[0013] Corresponding to each measuring step, when the secondary ruler is moved up and down and adjusted until the positioning and pressing end of the secondary ruler is flush with the step plane of the measuring step, the scale represented by the corresponding scale line indicated by the indicator mark represents the size, which is the distance between the step facade of the same measuring step and the reference facade.

[0014] The beneficial effect is that the gap measuring caliper provided by the present invention can be used to measure the gap to be measured formed by the corresponding surfaces of the objects on the left and right sides. When measuring, the measuring ruler segment is extended into the gap to be measured, the reference vertical surface on the right side of the measuring ruler segment is matched with the corresponding surface of the gap formed by the left object, the step vertical surface of the corresponding measuring step on the right side of the measuring ruler segment is matched with the corresponding surface of the gap to be measured by the right object, and the step plane of the corresponding measuring step is pushed and contacted with the corresponding end surface of the right object, and the size of the gap to be measured is determined by the distance between the step vertical surface of the corresponding measuring step and the reference vertical surface, and the positioning and pressing end of the auxiliary ruler is pressed against the right object forming the gap. When the corresponding end faces of the body are pushed and contacted, the positioning and pressing end of the secondary ruler is flush with the step plane of the corresponding measuring step. At this time, the scale represented by the corresponding scale line indicated by the indicator is the size of the gap to be measured. The step facade of the measuring step and the step plane are arranged one by one. In this way, when the positioning and pressing end of the secondary ruler is flush with the step plane, the step facade of each measuring step actually forms a corresponding relationship with the size indicated by the corresponding scale line, thereby converting the horizontal width of the gap to be measured into a vertical height, and transferring the conversion to the upper scale line through the secondary ruler, which is convenient for the operator to observe. When the gap to be measured is deep, the gap measuring caliper provided by the present invention can be used to convert the measurement structure to the upper scale line, which effectively solves the technical problem in the prior art that the tester cannot intuitively obtain the test result when the measuring gap is deep.

[0015] As a further improvement, among the multiple scale lines, the actual size of the interval between any adjacent scale lines is larger than the scale representation size represented by the interval.

[0016] The beneficial effect is that the actual size of the interval between any adjacent scale lines is larger than the scale size represented by the interval, which can magnify the narrow gap to be measured and improve the accuracy of measurement.

[0017] As a further improvement, the distance between the step facade of the bottommost measuring step among all measuring steps and the reference facade is equal to the left-right width dimension of the step plane of the bottommost measuring step; the upper and lower height dimensions of the step facade of each measuring step are greater than the left-right width dimension of the step plane of the same measuring step; the upper and lower height dimensions of the step facade of each measuring step are consistent, and the left-right width dimensions of the step plane of each measuring step are consistent.

[0018] The beneficial effect is that, under the premise of ensuring the magnified display, the consistency of each measuring step is limited, which is convenient for production.

[0019] As a further improvement, the positioning pressing end at the bottom of the secondary ruler is a pressing plane.

[0020] The beneficial effect is that the positioning pressing end at the bottom of the auxiliary ruler is a pressing plane, which can increase the contact area between the positioning pressing end and the corresponding end surface of the measured gap during positioning, which is beneficial to the stability during measurement.

[0021] As a further improvement, the multiple scale lines are along the up and down directions.

[0022] The beneficial effect is that a plurality of scale lines extend in the up-down direction, which is convenient for corresponding to the sub-scale that moves upward and downward, and is convenient for design and observation.

[0023] As a further improvement, the main scale and the secondary scale are both strip-shaped structures, and the secondary scale is arranged perpendicular to the main scale.

[0024] The beneficial effects are: the main scale and the auxiliary scale are both strip-shaped structures, which can be easily processed. The auxiliary scale is arranged perpendicular to the main scale, which can make the display of the indicator mark and the scale line more intuitive.

[0025] As a further improvement, one of the main scale and the auxiliary scale is provided with a guide slot extending in the up and down direction, and the other is provided with a guide matching structure, which cooperates with the guide slot to realize the guide sliding assembly of the main scale and the auxiliary scale.

[0026] The beneficial effect is that the guide groove is used to realize the guide assembly of the secondary ruler, which is convenient for processing and installation.

[0027] As a further improvement, a set screw is provided on the main scale or the secondary scale, which is used to fix the secondary scale on the main scale when the secondary scale is adjusted into place.

[0028] The beneficial effect is that a set screw is provided on the main scale or the auxiliary scale, which can conveniently lock the auxiliary scale at a predetermined position of the main scale when limiting, thereby improving the measurement accuracy and the convenience of operation.

[0029] As a further improvement, the guide groove is a dovetail groove or a T-shaped groove.

[0030] The beneficial effect is that the guide slide groove is a dovetail groove or a T-shaped groove, which can be easily processed and saves costs.

[0031] As a further improvement, the main scale includes an upper base section and a lower measuring scale section, the left and right width of the base section is larger than the left and right width of the measuring scale section, and a reduced diameter transition section is provided between the base section and the measuring dimension.

[0032] The beneficial effect is that a reduced diameter transition section is provided between the base section and the measuring scale section, so that the measuring scale section can still enter the gap to be measured when the peripheral conditions of the gap to be measured are relatively complicated, thereby expanding the practical scenarios of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of the gap measuring caliper provided by the present invention;

[0034] Figure 2 for Figure 1 A partial enlarged view of the scale lines of the middle main ruler;

[0035] Figure 3 for Figure 1 A partial enlarged view of the measuring scale section of the middle main scale;

[0036] Figure 4 A right side view of the gap measuring caliper provided by the present invention;

[0037] Figure 5 for Figure 4 Rear view of

[0038] Figure 6 for Figure 4 A top view of

[0039] Figure 7 for Figure 1 A schematic diagram of the structure in which the gap measuring caliper shown is applied to a spring pressure gauge for gap measurement;

[0040] Figure 8 for Figure 7 A partial enlarged view of the area near the middle indicator mark;

[0041] Fig. 9 for Figure 7 A partial enlarged view near the middle measuring scale segment.

[0042] Explanation of the reference numerals in the accompanying drawings: 1. Main scale; 11. Base section; 2. Scale line; 3. Guide groove; 4. Auxiliary scale; 41. Guide matching structure; 5. Reduced diameter transition section; 6. Measuring scale section; 61. Step plane; 62. Step elevation; 7. Set screw; 8. Indicator mark; 9. Reference elevation; 10. Positioning top pressure end. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0045] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a..." do not exclude the process or method that includes the elements.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The present invention is further described in detail below in conjunction with embodiments.

[0049] Specific embodiment 1 of the gap measuring caliper provided by the present invention:

[0050] When the indication of the spring pressure gauge is out of tolerance, it is necessary to adjust the adjusting screw installed on the pressure gauge movement slide body to an accurate value from the distance between the two ends of the compression spring pressure gauge movement slide body. At this time, a measuring tool is required to accurately measure the distance between the adjusting screw and the front end or rear end of the movement slide body. The gap measuring caliper provided in this embodiment can accurately measure the gap distance.

[0051] like Figures 1 to 9 As shown, the gap measuring caliper includes a main scale 1 and a secondary scale 4. The main scale 1 and the secondary scale 4 are strip-shaped structures, both extending in the up-down direction. The secondary scale 4 is vertically arranged on the main scale 1 in the up-down direction by sliding assembly.

[0052] Specifically, the main scale 1 includes an upper base section 11 and a lower measuring scale section 6. The left and right widths of the measuring scale section 6 gradually decrease from top to bottom. The right side of the measuring scale section 6 is a reference elevation, and the left side is provided with a plurality of continuous measuring steps. Each measuring step includes a step elevation 62 and a step plane 61. The corresponding step plane 61 is arranged on the corresponding step elevation 62 and is perpendicular to each other. All measuring steps are continuously arranged in the up-down direction to form a continuous step structure.

[0053] A reduced diameter transition section 5 is provided between the base section 11 and the measuring scale section 6 , and the length of the reduced diameter transition section 5 is greater than the thickness of the pressure gauge case.

[0054] The vertical height dimension L2 of the step facade 62 of each measuring step is consistent, and the horizontal width dimension L1 of the step plane 61 of each measuring step is consistent. The vertical height dimension L2 of the step facade 62 of each measuring step is twice the horizontal width dimension L1 of the corresponding step plane 61. The distance between the step facade 62 of the bottommost measuring step among all the measuring steps and the reference facade 9 is equal to the horizontal width dimension L1 of the step plane 61 of the measuring step. During the measurement process, the vertical height dimension L2 of the step facade 62 is used to convert and enlarge the horizontal width dimension L1 of the step plane 61 into the vertical height distance.

[0055] A dovetail groove is provided on the base section 11 at the upper part of the main ruler 1, and the dovetail groove serves as a guide slot 3 for guiding the secondary ruler 4 to move.

[0056] A plurality of scale lines 2 are arranged on the base section 11 at the upper part of the main scale 1, and the plurality of scale lines 2 are sequentially arranged beside the guide slot 3 in the up-down direction, and the actual dimension L3 of the spacing between adjacent scale lines 2 is equal to the height dimension L2 of the step elevation 62 of each measuring step. However, for the main scale, the actual dimension of the spacing between any adjacent scale lines 2 among the plurality of scale lines 2 is greater than the scale representation dimension represented by the spacing, forming a reduced representation effect.

[0057] A set screw 7 is installed on the back of the base section 11 of the main ruler 1 at a position corresponding to the dovetail groove, which is used to lock the auxiliary ruler 4 at a predetermined position.

[0058] The secondary ruler 4 is provided with an indicator mark 8, which is used to cooperate with the scale line 2 provided on the main ruler to display the measured distance. A dovetail is provided on the back of the secondary ruler 4, and the dovetail serves as a guide matching structure 41. The dovetail is used to cooperate with the dovetail groove on the main ruler 1 to form a sliding assembly, thereby realizing the guide assembly of the secondary ruler 4 and the main ruler 1.

[0059] At the same time, a positioning pressing end 10 is provided at the bottom of the secondary ruler 4. Here, the positioning pressing end 10 is specifically a positioning pressing plane, which is used to press on the outer edge end surface of the chute to be measured to improve the stability of positioning during measurement. When in use, the pressing plane at the bottom of the secondary ruler 4 is made to be horizontally flush with the step plane 61 of the corresponding measuring step, and the secondary ruler 4 is used to transfer the converted and enlarged vertical height to the base section 11 on the main ruler 1, and the measured distance is displayed through the cooperation of the scale line 2 on the main ruler 1 and the indicator mark 8 on the secondary ruler 4.

[0060] In this embodiment, when the main ruler 1 and the auxiliary ruler 4 cooperate, when the positioning top pressure plane at the bottom of the auxiliary ruler 4 is flush with the step plane 61 of one of the measuring steps, the indicator mark 8 on the auxiliary ruler 4 will definitely be aligned with a certain scale line 2. At this time, the scale represented by the certain scale line 2 is the distance from the step elevation 62 of the corresponding measuring step to the reference elevation 9, that is, the actual size of the gap to be measured.

[0061] When the secondary ruler 4 is adjusted upward by one measuring step, it actually rises by the height L2 of the step elevation, and accordingly, the position indicated by the indicator mark 8 on the secondary ruler 4 actually rises by a height L3. Accordingly, when the secondary ruler 4 is adjusted downward by one measuring step, the position indicated by the indicator mark 8 on the secondary ruler 4 actually drops by a height L3.

[0062] In this embodiment, since the distance between the step facade 62 of the bottommost measuring step and the reference facade 9 is L1, the bottommost measuring step is defined as the first measuring step, and the corresponding measuring step adjacent to the first measuring step is defined as the second measuring step, and the same is defined upwards, namely the fourth measuring step ... the Nth measuring step.

[0063] Because the distance between the step elevation 62 of the first measuring step and the reference elevation 9 is L1, and the left and right widths of the step planes 61 of each measuring step are also L1, when the bottom positioning and pressing end 10 of the secondary ruler 4 is flush with the step plane 61 of the first measuring step, the scale indicated by the scale line 2 indicated by the indicator 8 represents the dimension L1, which indicates the distance between the step elevation 62 of the first measuring step and the reference elevation 9. When the bottom positioning and pressing end 10 of the secondary ruler 4 is flush with the step plane 61 of the second measuring step, the scale indicated by the scale line 2 indicated by the indicator 8 represents the dimension 2*L1, which indicates the distance between the step elevation 62 of the second measuring step and the reference elevation 9. When the bottom positioning and pressing end 10 of the secondary ruler 4 is flush with the step plane 61 of the third measuring step, the scale indicated by the scale line 2 indicated by the indicator 8 represents the dimension 3*L1, which indicates the distance between the step elevation 62 of the third measuring step and the reference elevation 9. By analogy, the corresponding relationship between the scale lines 2 on the main scale 1 and the distances between the step facades 62 of each measuring step and the reference facade 9 can be determined.

[0064] like Figure 7 As shown, hold the upper part of the main scale 1 of the caliper, extend the measuring scale section 6 at the lower part of the main scale into the spring pressure gauge movement slot, so that the reference vertical surface 9 on the left side of the measuring scale section 6 is in top pressure contact with the adjusting screw of the spring pressure gauge movement, and the step vertical surface 62 of the corresponding measuring step on the right side of the measuring scale section is in top pressure contact with the inner edge of the rear end of the spring pressure gauge movement slot, and at the same time, the step plane 61 of the corresponding measuring step is pressed against the outer edge end surface of the rear end of the slot, and the auxiliary scale 4 is slowly moved downward. After the bottom positioning pressing end 10 of the auxiliary scale 4 is in contact with the outer edge end surface of the spring pressure gauge movement slot, observe that the distance represented by the indicator mark 8 on the auxiliary scale 4 pointing to the scale line 2 is the horizontal distance between the adjusting screw and the rear end of the spring pressure gauge movement slot body.

[0065] The gap measuring caliper provided in this embodiment can also be used to limit the connecting rod of the spring pressure gauge movement. First, determine the required horizontal distance between the adjusting screw and the rear end of the slide slot of the spring pressure gauge movement, then move the secondary scale 4 and observe that the indicator mark 8 is aligned with the corresponding scale line 2 on the base section 11 on the main scale 1, so that the positioning top pressure end 10 at the bottom of the secondary scale 4 and the step plane 61 of the corresponding measuring step on the measuring scale section 6 are kept in the same plane, tighten the set screw 7 on the back of the base section 11, lock the secondary scale 4 in the predetermined position on the main scale 1, and then move the measuring scale 1. Segment 6 is placed in the spring pressure gauge movement slide groove, so that the bottom positioning plane of the auxiliary scale 4 is pushed and contacted with the outer edge end face of the spring pressure gauge movement slide groove, the step vertical surface 62 of the corresponding measuring step on the measuring scale segment 6 is in contact with the inner wall of the rear end of the spring pressure gauge movement slide groove body, and the step plane 61 of the corresponding measuring step is in press contact with the outer edge end face of the rear end of the spring pressure gauge movement slide groove body. Move the spring pressure gauge movement connecting rod adjusting screw to contact with the left side reference vertical surface 9 of the measuring scale segment 6, and tighten the spring pressure gauge movement adjusting screw to complete the spring pressure gauge movement connecting rod limiting.

[0066] Specific embodiment 2 of the gap measuring caliper provided by the present invention:

[0067] The main difference between it and Example 1 is that in Example 1, in the measuring scale segment, the upper and lower height dimension L2 of the step facade of the measuring step is twice the left and right width dimension L1 of the step plane, while in this embodiment, the upper and lower height dimension L2 of the step facade of the measuring step on the measuring scale segment is N times the left and right width dimension L1 of the step plane, and N>2.

[0068] Of course, in other embodiments, N can be greater than 1, which plays a role of magnified display. Of course, the magnification factor should take into account the actual application scenario of the main ruler.

[0069] Of course, if the actual measurement gap is relatively large, the upper and lower height dimensions L2 of the step facade can be made equal to the left and right width dimensions of the step plane.

[0070] Specific embodiment 3 of the gap measuring caliper provided by the present invention:

[0071] The main difference between this embodiment and the first embodiment is that in the first embodiment, the main scale and the auxiliary scale are slidably connected by dovetail grooves and dovetail fit. In this embodiment, T-slots and T-structure fit can also be used to ensure that the main scale and the auxiliary scale are slidably assembled.

[0072] Specific embodiment 4 of the gap measuring caliper provided by the present invention:

[0073] The main difference between this embodiment and the first embodiment is that in the first embodiment, the guide slot is arranged on the main scale base and the matching structure is arranged on the upper part of the secondary scale. In this embodiment, the guide slot is arranged on the upper part of the secondary scale and the matching structure is arranged on the main scale base, so as to ensure the sliding matching between the main scale and the secondary scale.

[0074] Specific embodiment 5 of the gap measuring caliper provided by the present invention:

[0075] The main difference between it and embodiment 1 is that in embodiment 1, multiple scale lines are sequentially arranged along the up-down direction at the outer edge of the slide groove on the base, and the indicator mark is arranged on the upper part of the secondary ruler. In this embodiment, multiple scale lines are sequentially arranged along the up-down direction at the upper part of the secondary ruler, and the indicator mark is arranged on the base, so as to ensure that the measured distance is accurately reflected.

[0076] Specific embodiment 6 of the gap measuring caliper provided by the present invention:

[0077] The main difference between this embodiment and the first embodiment is that in the first embodiment, the positioning and pressing end at the bottom of the secondary ruler is a flat structure. In this embodiment, the positioning and pressing end at the top of the secondary ruler can also be a pointed structure.

[0078] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gap measuring caliper, characterized in that: include: The main scale and the secondary scale both extend in the up-down direction; The main ruler has a measuring ruler section at its lower part; The left and right widths of the measuring scale segment gradually decrease from top to bottom. The left side of the measuring scale segment is a reference elevation, which extends vertically up and down. The right side of the measuring scale segment is provided with a plurality of continuous measuring steps, each measuring step includes a step elevation and a step plane, the step elevation is parallel to the reference elevation, the step elevations belonging to the same measuring step are located below the step plane, and the step plane is arranged downward and perpendicular to the corresponding step elevation, and all the measuring steps are continuously arranged in the up and down direction to form a continuous step structure; The secondary ruler is guided and slidably assembled on the main ruler along the up-down direction. A positioning pressing end is provided at the bottom of the secondary ruler. The positioning pressing end is a positioning pressing plane, which is used to press on the outer edge end surface of the chute to be measured to improve the stability of positioning during measurement. The main ruler and the auxiliary ruler are provided with a plurality of scale lines arranged in sequence on the upper part of one of them, and an indicator mark for use with the other is provided on the other; Corresponding to each measuring step, when the secondary ruler is moved up and down and adjusted until the positioning and pressing end of the secondary ruler is flush with the step plane of the measuring step, the scale represented by the corresponding scale line indicated by the indicator mark is the distance between the step elevation of the same measuring step and the reference elevation; Both the main scale and the auxiliary scale are strip-shaped structures, and the auxiliary scale is arranged perpendicular to the main scale. One of the main scale and the auxiliary scale is provided with a guide slot extending in the up-down direction, and the other is provided with a guide matching structure that cooperates with the guide slot. A set screw is provided on the main scale or the auxiliary scale, which is used to fix the auxiliary scale on the main scale when the auxiliary scale is adjusted into place. The main scale includes an upper base section and a lower measuring scale section, and a reduced diameter transition section is provided between the base section and the measuring scale section.

2. The gap measuring caliper according to claim 1, characterized in that: Among the multiple scale lines, the actual size of the interval between any adjacent scale lines is greater than the scale representation size represented by the interval.

3. The gap measuring caliper according to claim 2, characterized in that: The distance between the step elevation of the bottommost measuring step among all the measuring steps and the reference elevation is equal to the left-right width dimension of the step plane of the bottommost measuring step; The vertical height of each measuring step is greater than the horizontal width of the step plane of the same measuring step; The upper and lower height dimensions of the step facades of each measuring step are consistent, and the left and right width dimensions of the step planes of each measuring step are consistent.

4. The gap measuring caliper according to claim 1, 2 or 3, characterized in that: The multiple scale lines are along the up and down directions.

5. The gap measuring caliper according to claim 1, 2 or 3, characterized in that: The guide slot is a dovetail slot or a T-shaped slot.

6. The gap measuring caliper according to claim 1, 2 or 3, characterized in that: The left-right width dimension of the base segment is greater than the left-right width dimension of the measuring scale segment.

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