Positioning marking tool

Abstract

The utility model discloses a positioning marking tool, which relates to the technical field of marking tools and comprises a marking guiding rule and two groups of positioning devices, through holes are arranged on the side surfaces of two ends of the marking guiding rule, the two groups of positioning devices are respectively connected with the through holes at the two ends of the marking guiding rule, and the axial direction of the through holes is perpendicular to the marking edge of the marking guiding rule. The two ends of the screw rod are provided with a left-hand thread and a right-hand thread respectively, the two positioning rods are provided with a left-hand threaded hole and a right-hand threaded hole respectively, the left-hand threaded hole and the right-hand threaded hole are correspondingly assembled into the left-hand thread and the right-hand thread, and the screw rod is rotationally connected to the through hole. The center line of the screw coincides with the center line of the marking guiding rule, and the distances from the initial positions of the two positioning rods to the center line of the marking guiding rule are equal. The positioning device further comprises a positioning plate used for limiting rotation of the positioning rod. The positioning marking tool improves the sampling accuracy of the sample block and is more convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of scribing tools, in particular to a positioning scribing tool. Background Art

[0002] In the sampling specification of mechanical property testing, it is required that the sample block be sampled in the middle of the incoming sample block, and the sizes of the remaining materials should be the same. The existing method for sampling sample blocks is to calculate according to the width of the incoming sample block and the required width of the sample block to determine the size of the remaining material. Use a height gauge to scribe on the incoming sample block to mark the middle part, which is the position of the required sample blank. Saw the incoming sample block according to the scribed mark to obtain a sample block that meets the specification requirements.

[0003] According to the above scribing method, the following problems exist: The operator needs to calculate the size of each incoming material to determine the position of the middle part and scribe. Calculation errors may occur during this process, resulting in inaccurate scribing positions. Such errors are usually discovered by checking the remaining materials after sawing, and once an error is found, material waste has already occurred; The scribing work cannot be directly completed on the incoming material, but the material needs to be moved to a special platform for operation. This increases the complexity and time cost of the operation; When the thickness and width dimensions of the incoming material are similar, the operator may be confused, resulting in an incorrect sawing direction. This will not only lead to sampling failure, but may also damage the material or equipment.

[0004] In summary, how to effectively solve the problems of low efficiency, error-proneness, and inconvenient operation existing in the existing sample block sampling method is an urgent problem for those skilled in the art at present. Content of the Utility Model

[0005] The purpose of the utility model is to provide a positioning scribing tool, which improves the accuracy of sample block sampling and is more convenient to operate.

[0006] To solve the above technical problems, the utility model provides the following technical solutions:

[0007] A positioning and scribing tool, comprising a scribing straightedge with through holes on both side surfaces at its two ends, and two groups of positioning devices respectively connected to the through holes at both ends of the scribing straightedge. The axis direction of the through hole is perpendicular to the scribing edge of the scribing straightedge. The positioning device includes a screw rod with left-handed threads and right-handed threads at both ends, and two positioning rods respectively provided with left-handed threaded holes and right-handed threaded holes. The left-handed threaded hole and the right-handed threaded hole are correspondingly assembled onto the left-handed thread and the right-handed thread. The screw rod is rotatably connected to the through hole, and the center line of the screw rod coincides with the center line of the scribing straightedge. The distances from the starting positions of the two positioning rods to the center line of the scribing straightedge are equal. The positioning device further includes a positioning plate for restricting the rotation of the positioning rod.

[0008] Optionally, the positioning plate is located above the screw rod, and sliding grooves along the axial direction of the screw rod are provided at both ends of the positioning plate. The positioning rod is inserted into the sliding groove and is slidably connected to the sliding groove.

[0009] Optionally, the positioning plate is parallel to the axial direction of the screw rod, and an annular groove is provided at the upper part of the positioning rod. The positioning plate is clamped into the annular groove.

[0010] Optionally, maximum positioning points and minimum positioning points for restricting the moving distance of the positioning rod are provided at both ends of the screw rod. The distance between the maximum positioning points at both ends corresponds to the maximum width of the incoming material sample block, and the distance between the minimum positioning points at both ends corresponds to the minimum width of the incoming material sample block. The maximum positioning points at both ends are symmetrical about the center line of the scribing straightedge, and the minimum positioning points at both ends are symmetrical about the center line of the scribing straightedge.

[0011] Optionally, the maximum positioning point is a positioning nut screwed onto the end of the screw rod, and the positioning nut is welded to the screw rod.

[0012] Optionally, the screw rod is a stepped shaft with a small diameter at the end, and the thread is provided on the small diameter. The minimum positioning point is the step surface of the stepped shaft.

[0013] Optionally, an annular groove is provided at the center line of the screw rod, a threaded hole corresponding to the annular groove is provided on the scribing straightedge, a limit screw is connected in the threaded hole, and the end of the limit screw extends into the annular groove. The limit screw is in clearance fit with the annular groove.

[0014] Optionally, the positioning rod is in line contact with the incoming material sample block.

[0015] Optionally, the scribing straightedge includes a main straightedge and two adjusting pads respectively detachably connected to the scribing surfaces on both sides of the main straightedge. The widths of the two adjusting pads are equal.

[0016] Optionally, the scribing straightedge includes fixed straightedges at both ends and an adjusting straightedge detachably connected to the fixed straightedges.

[0017] For the positioning and scribing tool provided by the present utility model, both sides of the scribing straightedge are parallel scribing surfaces, and through holes are provided on the side surfaces at both ends of the scribing straightedge. The axis of the through hole is perpendicular to the scribing surface. Two sets of positioning devices are respectively connected to the through holes at both ends of the scribing straightedge. The screw rod is rotationally connected to the through hole, that is, the screw rod can rotate in the through hole. The midline of the screw rod coincides with the midline of the scribing straightedge, and the axial position of the screw rod is fixed, and the screw rod cannot move axially along the through hole. Left-handed threads and right-handed threads are respectively provided at both ends of the screw rod, and left-handed threaded holes and right-handed threaded holes are respectively provided on the two positioning rods. The left-handed threaded hole is assembled onto the left-handed thread, and the right-handed threaded hole is assembled onto the right-handed thread. The positioning plate restricts the rotation of the positioning rod to ensure that the positioning plate moves along the axial direction of the screw rod. Since the thread directions at both ends of the screw rod are opposite, the thread directions of the positioning rods on both sides respectively correspond to the thread directions of the screw rods at both ends. When one end of the screw rod is rotated, the positioning rods at both ends can be driven to move relatively or towards each other simultaneously, so as to adjust the distance between the two positioning rods. After the tool is assembled, the two positioning rods clamp both sides of the incoming material sample block. The two positioning rods are symmetric about the midline of the scribing straightedge. When the two positioning rods approach or move away from each other simultaneously, the two positioning rods are always symmetric about the midline of the scribing straightedge, and the two scribing surfaces of the scribing straightedge are always symmetric about the midline of the scribing straightedge, that is, the scribing straightedge is in the middle of the incoming material sample block. A scribing needle is used to scribe a marking line on the incoming material sample block along the scribing straightedge.

[0018] For the positioning and scribing tool provided by the present utility model, the positioning device and the scribing straightedge are used to scribe the incoming material sample block, ensuring that the scribing straightedge is placed at the central position of the incoming material sample block, reducing human errors and improving the accuracy of sampling; the tool can be directly placed on the incoming material sample block, and the required marking line can be scribed by using the scribing straightedge without scribing on a platform, thus completing the material taking work, simplifying the operation process and reducing the time cost; according to the tolerance of the incoming material sample block, the range of the positioning rod is adjusted to ensure that the tool can be correctly clamped when placed on the blank, neither too tight nor having a gap, reducing operation errors; the screw rod connected to the positioning rod is designed with left and right hand threads, and the opening distance of the positioning rod is adjusted by rotating the screw rod to adapt to different sizes of incoming material sample blocks. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the use of the positioning and scribing tool provided by a specific embodiment of the present utility model;

[0021] Figure 2 is Figure 1 a sectional view of;

[0022] Figure 3 is a sampling drawing of incoming materials.

[0023] Reference numerals:

[0024] scribing straightedge 1, positioning plate 2, positioning rod 3, screw rod 4, fastener 5, positioning nut 6, limit screw 7, incoming material sample block 8. Specific implementation manner

[0025] The core of the present utility model is to provide a positioning and scribing tool, which improves the accuracy of sampling of the sample block and is more convenient to operate.

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figures 1 to 3 , Figure 1 is a schematic diagram of the use of the positioning and scribing tool provided by a specific implementation manner in the present utility model; Figure 2 is Figure 1 a sectional view of; Figure 3 is a sampling drawing of incoming materials.

[0028] In a specific implementation manner, the positioning and scribing tool provided by the present utility model includes a scribing straightedge 1 with through holes on both side surfaces at both ends, and two groups of positioning devices respectively connected to the through holes at both ends of the scribing straightedge 1. The axial direction of the through holes is perpendicular to the scribing edge of the scribing straightedge 1. The positioning device includes a screw rod 4 with left-handed threads and right-handed threads at both ends respectively, and two positioning rods 3 respectively provided with left-handed threaded holes and right-handed threaded holes. The left-handed threaded hole and the right-handed threaded hole are correspondingly assembled onto the left-handed thread and the right-handed thread. The screw rod 4 is rotatably connected to the through hole, and the center line of the screw rod 4 coincides with the center line of the scribing straightedge 1. The distances from the starting positions of the two positioning rods 3 to the center line of the scribing straightedge 1 are equal; the positioning device further includes a positioning plate 2 for restricting the rotation of the positioning rod 3.

[0029] In the above structure, the positioning and scribing tool includes a scribing straightedge 1 and a positioning device. The two sides of the scribing straightedge 1 are parallel scribing surfaces, and through holes are provided on both side surfaces at both ends of the scribing straightedge 1. The axis of the through hole is perpendicular to the scribing surface.

[0030] Two groups of positioning devices are respectively connected to the through holes at both ends of the scribing straightedge 1, and the positioning devices limit the scribing positions of the incoming sample blocks 8. The positioning device includes a screw rod 4, a positioning rod 3 and a positioning plate 2. The screw rod 4 is rotationally connected to the through hole, that is, the screw rod 4 can rotate in the through hole. The center line of the screw rod 4 coincides with the center line of the scribing straightedge 1, and the axial position of the screw rod 4 is fixed, and the screw rod 4 cannot move axially along the through hole.

[0031] Both ends of the screw rod 4 respectively have left-handed threads and right-handed threads. The two positioning rods 3 are respectively provided with left-handed threaded holes and right-handed threaded holes. The left-handed threaded hole is assembled onto the left-handed thread, and the right-handed threaded hole is assembled onto the right-handed thread. The positioning plate 2 limits the rotation of the positioning rod 3 to ensure that the positioning plate 2 moves along the axial direction of the screw rod 4. Since the thread directions at both ends of the screw rod 4 are opposite, the thread directions of the two positioning rods 3 on both sides respectively correspond to the thread directions of the screw rod 4 at both ends. When one end of the screw rod 4 is rotated, the two positioning rods 3 at both ends can be driven to move relatively or move towards each other, so as to adjust the distance between the two positioning rods 3. After the tool is assembled, the two positioning rods 3 clamp both sides of the incoming sample block 8.

[0032] At the same time, the distances from the starting positions of the two positioning rods 3 to the center line of the scribing straightedge 1 are equal. In other words, the two positioning rods 3 are symmetric about the center line of the scribing straightedge 1. When the two positioning rods 3 approach or move away from each other at the same time, the two positioning rods 3 are always symmetric about the center line of the scribing straightedge 1, and the two scribing surfaces of the scribing straightedge 1 are always symmetric about the center line of the scribing straightedge 1, that is, the scribing straightedge 1 is in the middle of the incoming sample block 8. Use a scribing needle to draw a marking line on the incoming sample block 8 along the scribing straightedge 1, and then enter the sawing process.

[0033] The positioning and scribing tool provided by the present utility model uses the positioning device and the scribing straightedge 1 to scribe the incoming sample block 8, ensuring that the scribing straightedge 1 is placed at the central position of the incoming sample block 8, reducing human errors and improving the accuracy of sampling; the tool can be directly placed on the incoming sample block 8, and the required marking line can be drawn by using the scribing straightedge 1 without scribing on the platform, completing the material taking work, simplifying the operation process and reducing the time cost; according to the tolerance of the incoming sample block 8, adjust the range of the positioning rod 3 to ensure that the tool can be correctly clamped when placed on the blank, neither too tight nor having a gap, reducing operation errors; the screw rod 4 connected to the positioning rod 3 is designed with left and right hand threads, and the opening distance of the positioning rod 3 is adjusted by rotating the screw rod 4 to adapt to different sizes of the incoming sample block 8.

[0034] On the basis of the above various specific embodiments, the positioning plate 2 is located above the screw rod 4, and both ends of the positioning plate 2 are provided with sliding grooves along the axial direction of the screw rod 4. The positioning rod 3 is inserted into the sliding groove and is slidably connected to the sliding groove.

[0035] In a specific embodiment, the positioning plate 2 is installed on the upper surface of the scribing straightedge 1. Specifically, the positioning plate 2 and the scribing straightedge 1 are connected by a fastener 5, which is a detachable connection. When there are damaged parts or the size specifications are inappropriate, it is convenient to replace them.

[0036] The sliding grooves at both ends of the positioning plate 2 are U-shaped grooves or long slots. The opening of the U-shaped groove is provided at the end of the positioning plate 2. The positioning rod 3 is inserted into the sliding groove and is slidably connected to the sliding groove. The sliding groove is along the axial direction of the screw rod 4. By the sliding groove, the movement of the positioning rod 3 along the axial direction of the screw rod 4 is restricted, preventing the positioning rod 3 from rotating along with the screw rod 4 during the rotation of the screw rod 4.

[0037] On the basis of the above various specific embodiments, the positioning plate 2 is parallel to the axial direction of the screw rod 4. An annular groove is provided on the upper part of the positioning rod 3, and the positioning plate 2 is clamped into the annular groove.

[0038] In a specific embodiment, the plate thickness of the positioning plate 2 is inserted into the U-shaped groove from the opening of the U-shaped groove, and the positioning rod 3 moves along the axial direction of the U-shaped groove. The thickness of the positioning plate 2 is equal to the distance between the annular grooves or the thickness of the positioning plate 2 is slightly less than the distance between the annular grooves, ensuring smooth sliding between the positioning plate 2 and the positioning rod 3 and reducing the wobbling amount of the positioning rod 3.

[0039] In a preferred embodiment, a bolt is connected to the upper end surface of the positioning rod 3. The bolt rod is connected in the U-shaped groove or the long slot, and the bolt head overlaps on the top surface of the positioning plate 2. Preferably, the distance of the bolt rod not connected to the positioning rod 3 is equal to or slightly greater than the thickness of the positioning plate 2.

[0040] In the above two embodiments, the connection method between the positioning rod 3 and the positioning plate 2 is simple, the movement is smooth, and it is easy to process.

[0041] On the basis of the above various specific embodiments, the two ends of the screw rod 4 are provided with a maximum positioning point and a minimum positioning point for restricting the moving distance of the positioning rod 3. The distance between the two maximum positioning points at both ends corresponds to the maximum width of the incoming sample block 8, and the distance between the two minimum positioning points at both ends corresponds to the minimum width of the incoming sample block 8. The two maximum positioning points at both ends are symmetric about the midline of the scribing straightedge 1, and the two minimum positioning points at both ends are symmetric about the midline of the scribing straightedge 1. The maximum positioning point and the minimum positioning point are used to limit the incoming sample block 8 with the maximum width and the incoming sample block 8 with the minimum width detected by the tool. In other words, the incoming sample block 8 with a width greater than the distance between the two maximum positioning points at both ends cannot be placed between the two positioning rods 3, and for the incoming sample block 8 with a width less than the distance between the two minimum positioning points at both ends, the two positioning rods 3 cannot clamp it. The incoming sample block 8 with a width greater than the distance between the two maximum positioning points at both ends and the incoming sample block 8 with a width less than the distance between the two minimum positioning points at both ends both exceed the applicable range of the tool, and the tool cannot be used for scribing.

[0042] When the thickness and width of the incoming sample block 8 are similar, and the operator cannot distinguish the thickness and width by observation, the operator can distinguish them through the maximum positioning point and the minimum positioning point of the tool to prevent the thickness and width from being confused and causing the sawing direction to be wrong, thereby ensuring the sawing direction is correct, reducing material waste and lowering the scrap rate.

[0043] On the basis of the above-mentioned specific embodiments, the maximum positioning point is the positioning nut 6 screwed on the end of the screw rod 4 , and the positioning nut 6 is welded to the screw rod 4 .

[0044] In a specific embodiment, after the positioning nut 6 adjusts the maximum crotch size of the positioning rod 3, the outer side is spot welded firmly, and the structure and connection method of the maximum positioning point are simple. Of course, the maximum positioning point can also be a bolt connected to the threaded hole at the end of the screw rod 4, or a connection hole can be provided at the set position of the screw rod 4, and the positioning pin is connected to the connection hole, and the maximum positioning point is the positioning pin. There are many structures and connection forms of the maximum positioning point, as long as they limit the maximum stroke of the positioning rod 3 and prevent the positioning rod 3 from falling out of the screw rod 4, they are all within the protection scope of this application.

[0045] On the basis of the above-mentioned specific embodiments, the screw rod 4 is a stepped shaft with a small end diameter, the thread is arranged on the small diameter, and the minimum positioning point is the step surface of the stepped shaft.

[0046] In a specific embodiment, the screw rod 4 is a stepped shaft, the end diameter of the screw rod 4 is smaller than the middle diameter, the positioning rod 3 is connected to the thread at the end, and the innermost position of the positioning rod 3 in the thread movement is the step surface that moves to the stepped shaft. The minimum movement position of the positioning rod 3 is limited by the step surface, which has a simple structure, is easy to process, and has stable limit. Of course, the minimum positioning point can also be a nut connected to the thread, and the nut is spot welded firmly on the outside after adjusting the minimum crotch size of the positioning rod 3. There are many structures and connection forms of the minimum positioning point, as long as the minimum stroke of the positioning rod 3 is limited, they are all within the protection scope of this application.

[0047] In a preferred embodiment, the stroke of the positioning rod 3 in the slide groove is smaller than the distance between the maximum positioning point and the minimum positioning point on the screw rod 4. The stroke of the slide groove can be used as the maximum movement position and the minimum movement position of the positioning rod 3. At this time, the slide groove is a long strip hole.

[0048] On the basis of the above-mentioned specific embodiments, a ring groove is provided at the center line of the screw rod 4, a screw hole corresponding to the ring groove is provided on the marking ruler 1, a limit screw 7 is connected in the screw hole, the end of the limit screw 7 extends into the ring groove, and the limit screw 7 and the ring groove are in clearance. The limit screw 7 limits the axial position of the screw rod 4 to prevent the screw rod 4 from moving left and right relative to the marking ruler 1; at the same time, the position of the limit screw 7 is fixed, and the limit screw 7 and the ring groove are in clearance, which does not interfere with the rotation of the screw rod 4, ensuring the normal rotation of the screw 4.

[0049] Furthermore, the screw holes on the scribing straightedge 1 are counterbores, and the upper end of the limit screw 7 does not protrude beyond the surface of the scribing straightedge 1, which does not affect the installation and positioning of the positioning plate 2.

[0050] Based on the above specific embodiments, the positioning rod 3 is in line and surface contact with the incoming material sample block 8.

[0051] In a specific embodiment, the positioning rod 3 is cylindrical. The positioning rod 3 is in line and surface contact with the incoming material sample block 8, reducing the clearance error caused by flatness between the positioning rod 3 and the incoming material sample block 8, ensuring that the positioning rod 3 and the incoming material sample block 8 can be closely attached, and ensuring the accuracy of scribing. Of course, the positioning rod 3 can also be a columnar shape with edges, which is convenient for processing; the positioning rod 3 can also be oval, similar to the cylindrical shape, with a smooth surface, which can reduce the contact indentation between the positioning rod 3 and the incoming material sample block 8.

[0052] Based on the above specific embodiments, the scribing straightedge 1 includes a main straightedge and two adjusting pads that are detachably connected to the scribing surfaces on both sides of the main straightedge. The widths of the two adjusting pads are equal. The scribing width is adjusted by the adjusting pads to meet different scribing width requirements. The thickness of the adjusting pads can have a series of dimensions to expand the scope of application.

[0053] Preferably, the adjusting pads can be only provided below the screw rod 4 without changing the connection mode between the screw rod 4 and the scribing straightedge 1, making the connection of the adjusting pads more convenient.

[0054] Based on the above specific embodiments, the scribing straightedge 1 includes fixed straightedges at both ends and an adjusting straightedge that is detachably connected to the fixed straightedges. The width of the adjusting straightedge is equal to the width of the fixed straightedge, and the length of the middle adjusting straightedge can be changed, so as to adapt to incoming material sample blocks 8 of different lengths.

[0055] Preferably, the adjusting straightedge and the fixed straightedge can be connected by plugging or mortise and tenon joints, which are convenient for connection and have relatively high connection reliability.

[0056] Based on the above specific embodiments, a receiving groove for placing a scribing needle is provided on the scribing straightedge 1. Scribing tools such as the scribing straightedge 1 can be placed in the receiving groove, making it more convenient to use. The opening of the receiving groove can be provided on the top surface of the scribing straightedge 1, and a cover plate is provided at the opening to cover the opening of the receiving groove without affecting the normal use of the tool.

[0057] Preferably, a handle is provided on the top surface of the scribing straightedge 1, which is convenient for taking, placing, and moving the tool.

[0058] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0059] The above has introduced in detail the positioning and marking tool provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown in this article, but will conform to the widest scope consistent with the principles and novel features disclosed in this article.

Claims

1. A positioning and marking tool, characterized in that: The invention comprises a marking ruler (1) having through holes on both ends of the side surfaces, and two sets of positioning devices respectively connected to the through holes at both ends of the marking ruler (1), wherein the axial direction of the through holes is perpendicular to the marking edge of the marking ruler (1), the positioning device comprises a screw rod (4) having left-handed threads and right-handed threads at both ends, respectively, and two positioning rods (3) respectively provided with left-handed threaded holes and right-handed threaded holes, wherein the left-handed threaded holes and right-handed threaded holes are respectively assembled into the left-handed threads and the right-handed threads, the screw rod (4) is rotatably connected to the through holes, the center line of the screw rod (4) coincides with the center line of the marking ruler (1), and the starting positions of the two positioning rods (3) are at the same distance from the center line of the marking ruler (1); the positioning device also comprises a positioning plate (2) for limiting the rotation of the positioning rods (3).

2. The positioning and marking tool according to claim 1, characterized in that: The positioning plate (2) is located above the screw rod (4), and both ends of the positioning plate (2) are provided with a sliding groove along the axial direction of the screw rod (4), and the positioning rod (3) is inserted into the sliding groove and is slidably connected with the sliding groove.

3. The positioning and marking tool according to claim 2, characterized in that: The positioning plate (2) is axially parallel to the screw rod (4); an annular groove is provided on the upper portion of the positioning rod (3); and the positioning plate (2) is inserted into the annular groove.

4. The positioning and marking tool according to claim 1, characterized in that: The screw rod (4) has a maximum positioning point and a minimum positioning point at both ends for limiting the moving distance of the positioning rod (3); the distance between the maximum positioning points at both ends corresponds to the maximum width of the incoming material sample (8); the distance between the minimum positioning points at both ends corresponds to the minimum width of the incoming material sample (8); the maximum positioning points at both ends are symmetrical about the center line of the marking ruler (1); and the minimum positioning points at both ends are symmetrical about the center line of the marking ruler (1).

5. The positioning and marking tool according to claim 4, characterized in that: The maximum positioning point is a positioning nut (6) screwed onto the end of the screw rod (4), and the positioning nut (6) is welded to the screw rod (4).

6. The positioning and marking tool according to claim 4, characterized in that: The screw (4) is a stepped shaft with a small end diameter, the thread is arranged on the small diameter, and the minimum positioning point is the step surface of the stepped shaft.

7. The positioning and marking tool according to claim 1, characterized in that: An annular groove is provided at the midline of the screw rod (4), a screw hole corresponding to the annular groove is provided on the marking ruler (1), a limit screw (7) is connected in the screw hole, the end of the limit screw (7) extends into the annular groove, and the limit screw (7) is clearance-matched with the annular groove.

8. The positioning and marking tool according to claim 1, characterized in that: The positioning rod (3) is in line-surface contact with the incoming material sample block (8).

9. The positioning and marking tool according to claim 1, characterized in that: The marking ruler (1) comprises a main ruler and two adjustment pads which are detachably connected to the marking surfaces on both sides of the main ruler, and the widths of the two adjustment pads are equal.

10. The positioning and marking tool according to claim 1, characterized in that: The marking ruler (1) comprises fixed rulers at two ends and an adjustable ruler detachably connected to the fixed ruler.

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