Height measuring device with movable scale marks

Abstract

The utility model discloses a height measuring device with movable scale marks, which belongs to the field of measuring tools and comprises a reference ruler, a support frame and a locking piece. The supporting frame comprises a base and a supporting sliding rail perpendicular to the base. The structures and the sizes of the cross sections at all positions of the effective sliding area of the supporting sliding rail are the same; the reference ruler comprises a hard ruler body; the ruler body is slidably connected with the supporting sliding rail in the vertical direction. And the locking piece is configured to lock the ruler body and the framework body. According to the utility model, the intuition of height measurement in the construction process can be improved, and the measurement efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of measuring tools, especially a height measuring device with movable scale marks. BACKGROUND

[0002] In the construction and interior decoration, the site needs to be leveled. At present, the construction personnel uses the level and the tape measure to select representative points on the ground to measure and level. The specific construction method is as follows: the construction personnel pulls out the tape measure to a certain length, vertically places the end of the tape measure on the position to be measured, then observes the intersection position of the infrared line of the level and the tape measure, records the position value as the reference point, then places the tape measure on another position to be measured, records the intersection position value of the level and the tape measure, subtracts the reference point value from the newly measured value, and calculates the height difference between the two points. If the subtraction result is positive, it means that the measurement position is lower than the reference point. If the subtraction result is negative, it means that the measurement position is higher than the reference point.

[0003] In daily practice, it is found that the existing measurement method using the tape measure is not intuitive, and the measurement result is sometimes confusing, which may cause construction errors.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above problems. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the application provides a reference ruler and a height measuring device with movable scale marks, which can improve the intuitiveness of height measurement during construction and effectively improve the measurement efficiency.

[0006] A height measuring device with movable scale marks comprises a reference ruler, a support frame, and a locking piece. The support frame comprises a base and a support slide rail perpendicular to the base. The cross-sectional structure and size of each position in the effective sliding area of the support slide rail are the same. The reference ruler comprises a hard ruler body. The ruler body is slidably connected with the support slide rail in the vertical direction. The locking piece is configured to lock the ruler body and the frame body.

[0007] Preferably, the ruler body is provided with a reference measurement mark and a measurement scale mark. The measurement scale mark is symmetrically or asymmetrically arranged on both sides of the reference measurement mark.

[0008] Preferably, the measurement scale mark is a scale line and a scale value. The scale value above the reference measurement mark and the scale value below the reference measurement mark both increase or decrease sequentially to both sides with the reference measurement mark as the starting point.

[0009] Preferably, when the scale value above the reference measurement mark is positive, the scale value below the reference measurement mark is negative or positive; when the scale value above the reference measurement mark is negative, the scale value below the reference measurement mark is positive or negative.

[0010] Preferably, the scale value is arranged along the measuring direction of the ruler or perpendicular to the measuring direction of the ruler.

[0011] Preferably, the reference measurement mark is a zero scale line and / or a zero scale value.

[0012] Preferably, the front, back or side surface of the ruler has a locking hole for cooperating with the locking member; the locking member comprises a fastener connecting body threadedly connected with the locking hole.

[0013] Preferably, the support slide rail comprises a slide rail body, a slide rail plane arranged on the slide rail body and a limiting sliding slot arranged perpendicular to the slide rail plane and penetrating through the slide rail body; the reference measurement mark and the measurement scale mark are arranged on the mounting plane and / or the opposite surface of the mounting plane; the ruler comprises a mounting plane capable of being attached to the slide rail plane and a locking hole arranged on the mounting plane; the fastener connecting body is arranged penetrating through the limiting sliding slot and threadedly connected with the locking hole.

[0014] Preferably, the ruler is a flat plate structure, the front or back surface of the flat plate structure is a mounting plane; the reference measurement mark and the measurement scale mark are arranged on the front and / or back surface of the ruler.

[0015] Preferably, the ruler is a multi-prism structure with an installation cavity inside, the reference measurement mark and the measurement scale mark are arranged on one side surface or multiple side surfaces of the prism; the installation cavity is arranged along the length direction of the ruler; the installation cavity penetrates through one end surface or both end surfaces of the ruler along the length direction; the locking hole is arranged between the installation cavity and the outer surface of the ruler and penetrates through the ruler between the installation cavity and the outer surface.

[0016] Preferably, the ruler is a cylindrical structure with an installation cavity inside, the reference measurement mark and the measurement scale mark are arranged on the side surface of the cylinder; the installation cavity is arranged along the length direction of the ruler; the installation cavity penetrates through one end surface or both end surfaces of the ruler along the length direction; the locking hole is arranged between the installation cavity and the outer surface of the ruler and penetrates through the ruler between the installation cavity and the outer surface.

[0017] Preferably, further comprising a protective pad arranged between the locking member and the support slide rail.

[0018] Preferably, the support slide rail is one of a plate structure, a cylindrical structure, a prism structure, a dovetail rail and a T-shaped rail.

[0019] Preferably, the reference ruler further comprises a fixing block fixed to the side surface of the ruler body and having a fixing hole; the fixing hole is in communication with the locking hole; the fixing hole has the same diameter as the locking hole and is located on the same straight line as the locking hole; and the fastener connecting body can be threadedly connected with the locking hole and the fixing hole simultaneously.

[0020] Preferably, the length of the ruler body is greater than, less than or equal to the height of the support slide rail.

[0021] Compared with the prior art, the application has at least the following beneficial effects:

[0022] 1. The utility model has a reference measurement line, which facilitates reading by construction personnel, improves the intuitiveness of height measurement during construction and effectively improves the measurement efficiency.

[0023] 2. The reference measurement line can be adjusted in the height direction, facilitating alignment with the infrared line of the level during construction and improving the convenience of use.

[0024] 3. The measurement scale mark on the ruler body can be asymmetrically arranged relative to the reference measurement mark, thereby effectively reducing the occupied space of the height measurement device of the movable scale mark or increasing the effective range of the height measurement device of the movable scale mark. BRIEF DESCRIPTION OF DRAWINGS

[0025] Some specific embodiments of the utility model will be described in detail below with reference to the accompanying drawings in an exemplary but not limiting manner. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale.

[0026] In the drawings:

[0027] Figure 1 Fig. 1 is a front view of the structure of the utility model embodiment 1;

[0028] Figure 2 Fig. 2 is a side view of the structure of the utility model embodiment 1;

[0029] Figure 3 Fig. 3 is a back view of the structure of the utility model embodiment 1;

[0030] Figure 4 Fig. 4 is a front view of the structure of the utility model embodiment 2;

[0031] Figure 5 Fig. 5 is a front view of the structure of the utility model embodiment 3;

[0032] Figure 6 It is the front structure schematic view of embodiment 4 of the utility model;

[0033] Figure 7 It is the front structure schematic view of embodiment 5 of the utility model;

[0034] Figure 8 It is the side structure schematic view of embodiment 5 of the utility model;

[0035] Figure 9 It is the sectional view of B-B position in Figure 7

[0036] Figure 10 It is the three-dimensional structure schematic view of reference ruler in embodiment 5 of the utility model;

[0037] Figure 11 It is the three-dimensional structure schematic view of reference ruler in embodiment 6 of the utility model;

[0038] Figure 12 It is the front structure schematic view of embodiment 7 of the utility model;

[0039] Figure 13 It is the sectional view of C-C position in Figure 12

[0040] Figure 14 It is the three-dimensional structure schematic view of reference ruler in embodiment 7 of the utility model;

[0041] Figure 15 It is the front structure schematic view of embodiment 8 of the utility model;

[0042] Figure 16 It is the side structure schematic view of embodiment 8 of the utility model;

[0043] Figure 17 It is the sectional view of C-C position in Figure 15

[0044] Figure 18 It is the three-dimensional structure schematic view of reference ruler in embodiment 8 of the utility model.

[0045] Among them, the above-mentioned drawing includes the following figure marks:

[0046] 10, reference ruler, 11, ruler body, 12, reference measurement mark, 13, scale line, 14, scale value, 15, locking hole, 16, installation plane, 17, installation cavity, 18, fixed block, 20, support frame, 21, support slide rail; 22, base; 30, locking piece, 40, limit sliding groove, 50, pad, 211, slide rail body, 212, slide rail plane. DETAILED DESCRIPTION​​​

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Example 1

[0049] like Figures 1-3 As shown, a height measuring device with a movable scale includes a reference ruler 10, a support frame 20, and a locking element 30. The support frame 20 includes a base 22 and a support slide rail 21 perpendicular to the base 22. The cross-sectional structure and dimensions of the support slide rail 21 are identical at all positions within its effective sliding area. The reference ruler 10 includes a rigid ruler body 11, which is slidably connected to the support slide rail 21 in the vertical direction. The locking element 30 is configured to lock the ruler body 11 to the support slide rail 21.

[0050] Furthermore, the ruler body 11 is provided with a reference measurement mark 12 and a measurement scale mark; the measurement scale mark is symmetrically arranged on both sides of the reference measurement mark 12.

[0051] In this embodiment, the measurement scale is marked by scale lines 13 and scale values ​​14. The scale values ​​14 are set along the measurement direction of the ruler 11. The scale values ​​14 above and below the reference measurement mark 12 are both positive numbers, and increase sequentially from the reference measurement mark 12. The reference measurement mark is a zero scale line and / or a zero scale value.

[0052] In another embodiment of this utility model, the scale values ​​14 above and below the reference measurement mark 12 decrease sequentially from the reference measurement mark 12.

[0053] It should be noted that, provided the intersection of the infrared beam of the level and the tape measure strip, and the distance between the reference measurement mark 12 and the reference measurement mark 12 can be clearly observed, the scale values ​​14 above and below the reference measurement mark 12 can be adaptively set according to requirements. Similarly, the scale value 14 can be represented by Arabic numerals in imperial or metric units, or by Roman numerals and English letters.

[0054] In another embodiment of this utility model, the reference measurement mark position is specially designed to be eye-catching. For example, the font size of the mark can be increased or the mark can be coated with a bright color.

[0055] In the embodiment, the support slide rail 21 is a plate structure, comprising a slide rail body 211, a slide rail plane 212 arranged on the slide rail body 211, and a limiting sliding groove 40 perpendicular to the slide rail plane 212 and penetrating through the slide rail body 211. The ruler body 11 is a flat plate structure, the back surface of the flat plate structure is the mounting plane 16, and the reference measurement mark 12 and the measurement scale mark are arranged on the front surface of the ruler body 11. The ruler body 11 comprises the mounting plane 16 capable of being attached to the slide rail plane 212 and the locking hole 15 arranged on the mounting plane 16; that is, the back surface of the ruler body 11 is provided with the locking hole 15 for cooperating with the locking piece 30. At this time, the locking piece 30 comprises a fastener connecting body threadedly connected with the locking hole 15, and the fastener connecting body is arranged in the limiting sliding groove 40 and threadedly connected with the locking hole 15.

[0056] Further, the locking hole 15 can also penetrate through the ruler body 11. In this state, the embodiment can also be satisfied.

[0057] It should be noted that the front surface of the flat plate structure can also be the mounting plane 16, at this time, the reference measurement mark 12 and the measurement scale mark are arranged on the front surface and / or the back surface of the ruler body 11. When the reference measurement mark 12, the measurement scale mark and the mounting plane 16 are arranged on the same surface, the width of the reference measurement mark 12 and the measurement scale mark must be greater than the width of the mounting plane 16, and the construction personnel can identify and read the reference measurement mark 12 and the measurement scale mark through the leakage area outside the action area of the mounting plane 16.

[0058] When the reference measurement mark 12, the measurement scale mark and the mounting plane 16 are arranged on the same surface, the surface can also be reversed, and the side surface is used as the reading surface. Since the surface has the reference measurement mark 12 and the measurement scale mark, reading and measurement can also be performed in this state.

[0059] In another embodiment of the utility model, the other surface of the reference ruler 10 except the mounting plane 16 can be a plane or a non-plane. The plane structure can facilitate engraving of the reference measurement mark 12 and the measurement scale mark, and effectively reduce the height measurement device of the movable scale mark. However, the non-plane structure can also solve the corresponding technical problems, improve the intuitiveness of height measurement in the construction process, and effectively improve the measurement efficiency.

[0060] Further, the locking hole 15 has two groups, and the two groups of locking holes 15 are arranged on the front surface or the back surface of the ruler body 11 close to the upper and lower ends. In use, the upper and lower ends of the ruler body 11 can be exchanged, so that the construction personnel can effectively read the reference measurement mark 12 and the scale value 14 in the sagging state.

[0061] Embodiment 2

[0062] Example 2 is the same as example 1. The only difference is that:

[0063] As shown in Figure 4 , the measurement scale marks are asymmetrically arranged on both sides of the reference measurement mark 12, and the scale values 14 are arranged perpendicular to the measurement direction of the ruler body 11. That is, the scale values 14 are arranged in the horizontal direction.

[0064] That is, the number of measurement scale marks on one side of the reference measurement mark 12 is more or less than that on the other side. By means of this scheme, the range of the height measurement device with movable scale marks can be effectively extended when the upper and lower ends of the ruler body 11 are exchanged, or the height measurement device with movable scale marks can be used in a narrow space.

[0065] Example 3

[0066] Example 3 is the same as example 2. The only difference is that:

[0067] As shown in Figure 5 , the scale values 14 above the reference measurement mark 12 are positive, and the scale values 14 below the reference measurement mark 12 are negative. By arranging positive and negative numbers on both sides of the reference measurement mark 12, the height measurement data can be effectively distinguished, the intuitiveness of the reading is improved, and the height measurement data is avoided to be misread by the construction personnel.

[0068] Example 4

[0069] Example 4 is the same as example 1. The only difference is that:

[0070] As shown in Figure 6 , the measurement scale marks are symmetrically arranged on both sides of the reference measurement mark 12, and the scale values 14 are arranged perpendicular to the measurement direction of the ruler body 11. The scale values 14 above the reference measurement mark 12 are positive, and the scale values 14 below the reference measurement mark 12 are negative.

[0071] In another embodiment of the present application, when the scale values 14 above the reference measurement mark 12 are negative, the scale values 14 below the reference measurement mark 12 are positive.

[0072] By arranging positive and negative numbers on both sides of the reference measurement mark 12, the height measurement data can be effectively distinguished, the intuitiveness of the reading is improved, and the height measurement data is avoided to be misread by the construction personnel.

[0073] Example 5

[0074] Example 5 is the same as example 1. The only difference is that:

[0075] As shown in Figures 7-10As shown, the support slide rail 21 is a plate structure, including a slide rail body 211, and a slide rail plane 212 arranged on the slide rail body. The ruler body 11 is a cuboid structure, and the cross section of the cuboid structure is a rectangle. An installation cavity 17 is arranged in the cuboid structure along the length direction of the cuboid structure. The shape and size of the installation cavity 17 are adapted to the support slide rail 21, and the support slide rail 21 is inserted into the installation cavity 17, so that the two can be slidably connected.

[0076] It should be noted that the cross section structure and size of the effective sliding area of the support slide rail 21 are the same at each position, so that the ruler body 11 can slide along the support slide rail 21 in the vertical direction. For example, the support slide rail 21 is one of a plate structure, a cylindrical structure, a prismatic structure, a dovetail rail, and a T-shaped rail.

[0077] The reference measurement mark 12 and the measurement scale mark are arranged on the front surface of the ruler body 11. The installation cavity 17 penetrates the two end surfaces of the ruler body 11 along the length direction. The locking hole 15 is arranged between the installation cavity 17 and the outer surface of the ruler body 11 and penetrates the ruler body 11 therebetween. The locking piece 30 includes a fastener connecting body which is threadedly connected with the locking hole 15, and the fastener connecting body is arranged in the limiting sliding groove 40 and is threadedly connected with the locking hole 15.

[0078] It should be noted that the locking hole 15 can be arranged on any side surface of the ruler body 11. The locking hole 15 arranged on any side surface of the ruler body 11 can be threadedly connected with the locking piece 30, so as to lock the ruler body 11 and the support slide rail 21.

[0079] As another embodiment of the utility model, the height measurement device of the movable scale mark further includes a protective pad 50 arranged between the fastener connecting body and the support slide rail 21, which is used for preventing the fastener connecting body from damaging the support slide rail 21. In addition, the protective pad 50 can effectively increase the friction between the protective pad 50 and the support slide rail 21, so as to prevent the ruler body 11 from sliding relative to the support slide rail 21 during use.

[0080] In the embodiment, the length of the ruler body 11 is less than the effective length of the support slide rail 21, so that the occupied space of the height measurement device of the movable scale mark can be reduced, and the production cost can be effectively reduced. At the same time, since the ruler body 11 can slide along the support slide rail 21, even in the case that the length of the ruler body 11 is less than the effective length of the support slide rail 21, the range of the height measurement device of the movable scale mark is still greater than the effective height of the support slide rail 21.

[0081] It should be noted that according to the specific use, the length of the ruler body 11 can be greater than, less than, or equal to the height of the support slide rail 21.

[0082] Further, the ruler body 11 can be a multi-prism structure with the mounting cavity 17 inside, and the reference measurement mark 12 and the measurement scale mark are arranged on one side or multiple sides of the prism.

[0083] As another embodiment of the present application, the ruler body 11 is a cylindrical structure with the mounting cavity 17 inside, and the reference measurement mark 12 and the measurement scale mark are arranged on the side of the cylinder. The mounting cavity 17 is arranged along the length direction of the ruler body 11. The mounting cavity 17 penetrates one end surface or both end surfaces of the ruler body 11 along the length direction, and the locking hole 15 is arranged between the mounting cavity 17 and the outer surface of the ruler body 11 and penetrates the ruler body 11 therebetween. When the mounting cavity 17 penetrates one end surface of the ruler body 11 along the length direction, the slide rail body 211 can be inserted into the mounting cavity 17 from the end surface, and can be connected with the ruler body 11 in the height direction to realize the adjustment of the ruler body 11 in the vertical direction. When the mounting cavity 17 penetrates both end surfaces of the ruler body 11 along the length direction, the slide rail body 211 can be inserted into the mounting cavity 17 from any of the two end surfaces. In use, the upper and lower ends of the ruler body 11 can be exchanged, and the upper and lower ends of the ruler body 11 can be exchanged to enable the construction personnel to effectively read the reference measurement mark 12 and the scale value 14 in the sagging state.

[0084] Further, the measurement scale mark on one side of the reference measurement mark 12 can be more or less than the measurement scale mark on the other side. According to this scheme, when the upper and lower ends of the ruler body 11 are exchanged, the range of the height measurement device of the movable scale mark is effectively extended or the height measurement device of the movable scale mark is used in a narrow space.

[0085] Embodiment 6

[0086] Embodiment 6 is the same as embodiment 5. The only difference is that:

[0087] As shown in Figure 11 , the ruler body 11 is a three-prism structure, and the three-prism structure is internally provided with the mounting cavity 17 arranged along the length direction thereof. The shape and size of the mounting cavity 17 are adapted to the support slide rail 21, and the support slide rail 21 is inserted into the mounting cavity 17, so that the two can be connected in sliding. In this embodiment, the mounting cavity 17 is also a three-prism structure mounting cavity.

[0088] Embodiment 7

[0089] Embodiment 7 is the same as embodiment 5. The only difference is that:

[0090] As shown in Figures 12-14As shown, the ruler body 11 is a cuboid structure, and the cross section of the cuboid structure is square, and the cuboid structure is provided with a mounting cavity 17 arranged along the length direction of the cuboid structure. The mounting cavity 17 is a cavity of the cuboid structure. Similarly, the slide rail body 211 is a cuboid structure adapted to the mounting cavity 17.

[0091] Embodiment 8

[0092] Embodiment 8 is the same as embodiment 5. The difference is only that:

[0093] As Figures 15-18 shown, the mounting cavity 17 is a T-shaped structure, which penetrates through the two end faces and one side face of the ruler body 11. Similarly, the support slide rail 21 is a T-shaped slide rail adapted to the structure of the mounting cavity 17. The ruler body 11 and the support slide rail 21 are connected in a sliding manner in the vertical direction. The reference ruler 10 further comprises a fixing block 18 provided with a fixing hole on the side face of the ruler body 11. The fixing hole is in communication with and located on the same straight line as the locking hole 15. The fixing hole has the same diameter as the locking hole 15, and both are threaded holes. The fastener connecting body of the locking piece 30 can be threadedly connected with the locking hole 15 and the fixing hole at the same time. The provision of the fixing block 18 can effectively increase the stroke of the locking piece 30 and prevent it from falling during the process of loosening the locking piece 30.

[0094] Further, the fixing block 18 can be provided in one or more pieces according to the configuration of the locking hole 15. For example, when the fixing block 18 is two pieces, it can be fixed on the side face of the ruler body 11 near the upper end and the lower end of the ruler body 11.

[0095] It should be noted that the fixing block 18 can be fixedly connected with the side face of the ruler body 11 in a detachable or non-detachable manner. For example, the fixing block 18 can be fixed on the side face of the ruler body 11 in a non-detachable manner by means of adhesion, welding or riveting. The fixing block 18 can also be detachably fixed on the side face of the ruler body 11 by means of bolt connection.

[0096] Further, the measurement scale marks on the reference ruler 10 are asymmetrically arranged on both sides of the reference measurement mark 12, and the scale values 14 are arranged along the measurement direction of the ruler body 11. That is, the measurement scale marks on one side of the reference measurement mark 12 are more or less than those on the other side. By means of this scheme, the range of the height measurement device of the movable scale mark can be effectively extended when the upper and lower ends of the ruler body 11 are exchanged, or the height measurement device of the movable scale mark can be used in a narrow space.

[0097] Further, the scale value 14 above the reference measurement mark 12 can also be negative, and the scale value 14 below the reference measurement mark 12 can also be positive. It should be noted that the scale value 14 above the reference measurement mark 12 is positive, and the scale value 14 below the reference measurement mark 12 is negative. Through the positive and negative numbers on both sides of the reference measurement mark 12, the height measurement data can be effectively distinguished, the intuitiveness of the reading is improved, and the construction personnel misreading the height measurement data is avoided.

[0098] As another embodiment of the utility model, the mounting cavity 17 is a dovetail groove structure, and the supporting slide rail 21 is adapted to the structure of the mounting cavity 17 and is a dovetail type slide rail.

[0099] For the convenience of description, spatial relative terms such as "above", "upper", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0100] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, work, device, component and / or combination thereof.

[0101] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0102] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A height measuring device with a movable scale mark, characterized in that The utility model provides a reference ruler, support frame and locking piece, the support frame includes base and the support slide rail who sets up perpendicularly to the base, the support slide rail effective sliding area each position cross section structure and size are all same, the reference ruler includes hard quality ruler body, the ruler body with the support slide rail is in vertical direction sliding connection, the locking piece is configured to lock the ruler body with the support slide rail.

2. The height measuring device of claim 1, wherein, The ruler body is provided with reference measurement mark and measurement scale mark, the measurement scale mark is symmetrically or asymmetrically arranged on both sides of the reference measurement mark.

3. The height measuring device of claim 2, wherein, The measurement scale mark is scale line and scale value, the scale value above the reference measurement mark and the scale value below the reference measurement mark are sequentially increased or decreased to both sides with the reference measurement mark as starting point.

4. The height measuring device of claim 3, wherein, When the scale value above the reference measurement mark is positive, the scale value below the reference measurement mark is negative or positive. When the scale value above the reference measurement mark is negative, the scale value below the reference measurement mark is positive or negative.

5. The height measuring device of claim 3, wherein, The scale value is arranged along the measurement direction of the ruler body or perpendicular to the measurement direction of the ruler body.

6. The height measuring device of claim 2, wherein, The reference measurement mark is zero scale line and / or zero scale value.

7. Height measuring device according to any of claims 2-6, characterized in that The front, back or side of the ruler body has a locking hole for cooperating with the locking piece, and the locking piece includes a fastener connecting body threadedly connected with the locking hole.

8. The height measuring device of claim 7, wherein, The support slide rail includes a slide rail body, a slide rail plane arranged on the slide rail body, and a limiting sliding groove perpendicular to the slide rail plane and penetrating through the slide rail body; the reference measurement mark and the measurement scale mark are arranged on the mounting plane and / or the opposite side of the mounting plane; the ruler body includes a mounting plane capable of being attached to the slide rail plane and a locking hole arranged on the mounting plane; the fastener connecting body is arranged in the limiting sliding groove and threadedly connected with the locking hole.

9. The height measuring device of claim 8, wherein, The ruler body is a flat plate structure, and the front or back of the flat plate structure is a mounting plane; the reference measurement mark and the measurement scale mark are arranged on the front and / or back of the ruler body.

10. The height measuring device of claim 7, wherein, The ruler body is a multi-prism structure with an installation cavity inside, the reference measurement mark and the measurement scale mark are arranged on one side or multiple sides of the prism; the installation cavity is arranged along the length direction of the ruler body; the installation cavity penetrates through one end surface or two end surfaces of the ruler body along the length direction; the locking hole is arranged between the installation cavity and the outer surface of the ruler body and penetrates through the ruler body therebetween.

11. The height measuring device of claim 7, wherein, The ruler body is a cylindrical structure with an installation cavity inside, the reference measurement mark and the measurement scale mark are arranged on the side of the cylinder; the installation cavity is arranged along the length direction of the ruler body; the installation cavity penetrates through one end surface or two end surfaces of the ruler body along the length direction; the locking hole is arranged between the installation cavity and the outer surface of the ruler body and penetrates through the ruler body therebetween.

12. The height measuring apparatus of claim 7, wherein, It also includes a protective pad arranged between the locking piece and the support slide rail.

13. The height measuring apparatus of claim 1, wherein, The support slide rail is one of a plate structure, a cylindrical structure, a prism structure, a dovetail track and a T-shaped track.

14. The height measuring apparatus of claim 7, wherein, The reference ruler further comprises a fixing block fixed to the side of the ruler body and having a fixing hole; the fixing hole is in communication with the locking hole; the diameter of the fixing hole is the same as that of the locking hole and is located on the same line with the locking hole; the fastener connecting body can be screwed with the locking hole and the fixing hole at the same time.

15. The height measuring apparatus of claim 1, wherein, The length of the ruler body is greater than, less than, or equal to the height of the support slide rail.

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