Rack centerline scribing tool

Abstract

The utility model provides a kind of center line scribing tool.The head of positioning bolt is downwardly extended to the below of fixed plate, to make when the side of fixed plate and rack is pasted, the head of two positioning bolts can be contacted with tooth surface, to guarantee the stability in the sliding process of fixed plate from dedendum to addendum.The scribing needle is made of material with greater hardness than rack, to guarantee its stability in line changing on rack.Because scribing needle is perpendicular to fixed plate, and located at the front end of fixed plate, when fixed plate slides, scribing needle can form scribing mark on the side of rack.The setting of the line of two positioning bolts and the perpendicularity of adjusting lever, can make scribing needle have stability in leaving mark in the sliding process of fixed plate.Therefore, when fixed plate slides on two tooth surfaces of same tooth, the intersection point of two scribing marks is located on the center line of tooth top, to quickly determine the center line, to reach the effect of improving the efficiency of confirming center line.

Description

Technical Field

[0001] This utility model relates to the field of rack measuring tools, and in particular to a rack centerline scribing tool. Background Technology

[0002] In the manufacturing process of the main chord tube, rack inspection is a crucial step, and rack centerline scribing is essential. The normal method for scribing the rack centerline is as follows: based on the width of the tooth surface and the width of the tooth root, first use a steel ruler to find the center of the tooth surface and the tooth root respectively, and then connect the two center points. This method relies heavily on the measurement skills and accuracy of the measuring personnel, and the measurement error can be relatively large, which is time-consuming and labor-intensive. Utility Model Content

[0003] In view of the above problems, this utility model is proposed to provide a rack centerline scribing tool that overcomes or at least partially solves the above problems, and can solve the problems of complex operation and low efficiency of existing rack centerline scribing methods, so as to achieve the effect of quick and convenient rack centerline scribing.

[0004] Specifically, this utility model provides a rack centerline scribing tool, which includes:

[0005] Fixing plate;

[0006] A marking assembly, comprising an adjusting rod and a marking needle; the adjusting rod extends in a left-right direction and is slidably disposed on the upper surface of the fixing plate in a left-right direction; the right end of the adjusting rod is located on the outside of the fixing plate, and the right end is provided with a through mounting hole; the marking needle is inserted into the mounting hole.

[0007] The positioning assembly includes two positioning bolts; the fixing plate has two positioning threaded holes at the left end of the adjusting rod, and the two positioning threaded holes are symmetrically arranged about the adjusting rod; the line connecting the two positioning threaded holes is perpendicular to the adjusting rod; each positioning bolt is installed in one of the positioning threaded holes, and the head of the positioning bolt is located below the fixing plate.

[0008] Optionally, the scribing assembly further includes at least two adjusting bolts;

[0009] The fixed plate has at least two adjusting threaded holes; a plurality of adjusting threaded holes are arranged at intervals in the left-right direction; the adjusting rod is provided with an adjusting groove that extends vertically; the adjusting groove extends in the left-right direction; the head diameter of the adjusting bolt is greater than the width of the adjusting groove; the adjusting bolt is installed in the adjusting groove, and each adjusting bolt is inserted into one of the adjusting threaded holes.

[0010] Optionally, the scribing assembly further includes a fastening bolt; the scribing needle is slidably inserted into the mounting hole.

[0011] The right end of the adjusting rod is provided with a fastening threaded hole communicating with the mounting hole; the fastening threaded hole extends radially along the mounting hole; the fastening bolt is installed in the fastening threaded hole.

[0012] Optionally, the positioning assembly further includes two positioning blocks; the positioning blocks are rectangular blocks; each rectangular block is fixed to the head of one of the positioning bolts and is parallel to each other on the lower surface of the fixing plate.

[0013] This utility model discloses a rack centerline scribing tool. It comprises a fixed plate, a scribing assembly, and a positioning assembly, with hexagonal heads on the positioning bolts. Because the heads of the positioning bolts extend downwards from below the fixed plate, the heads of the two positioning bolts can contact the tooth surface when the fixed plate is in contact with the side of the rack, ensuring the stability of the fixed plate during its sliding from the tooth root to the tooth tip. The scribing needle is made of a material with a hardness greater than that of the rack, ensuring its stability when changing lines on the rack. Since the scribing needle is perpendicular to the fixed plate and located at the front end of the fixed plate, it can form scribing marks on the side of the rack when the fixed plate slides. The perpendicular arrangement of the line connecting the two positioning bolts and the adjusting rod ensures the stability of the scribing marks left by the needle during the sliding of the fixed plate. Therefore, when the fixed plate slides on the two tooth surfaces of the same tooth, the intersection of the two scribing marks is located on the centerline of the tooth tip, allowing for rapid determination of the centerline and improving the efficiency of centerline confirmation.

[0014] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0015] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0016] Figure 1 This is a schematic structural diagram of a rack centerline marking tool according to an embodiment of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of a rack centerline marking tool according to an embodiment of the present utility model;

[0018] In the diagram: 100, fixing plate; 210, scribing needle; 220, adjusting rod; 221, adjusting groove; 230, adjusting bolt; 240, fastening bolt; 310, positioning bolt; 320, positioning block. Detailed Implementation

[0019] The following reference Figures 1 to 2 This description refers to a rack centerline scribing tool according to an embodiment of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0020] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Figure 1 It is a tool for marking the center line of a rack, such as Figure 1 As shown, and refer to Figure 2 This utility model provides a rack centerline scribing tool, which includes a fixed plate 100, a scribing assembly, and a positioning assembly. The scribing assembly includes an adjusting rod 220 and a scribing needle 210. The adjusting rod 220 extends in the left-right direction and is slidably disposed on the upper surface of the fixed plate 100 in the left-right direction. The right end of the adjusting rod 220 is located outside the fixed plate 100, and the right end is provided with a through mounting hole, in which the scribing needle 210 is inserted.

[0024] The positioning assembly includes two positioning bolts 310. Two positioning threaded holes are provided on the fixing plate 100 at the left end of the adjusting rod 220, and the two positioning threaded holes are symmetrically arranged about the adjusting rod 220. The line connecting the two positioning threaded holes is perpendicular to the adjusting rod 220. Each positioning bolt 310 is installed in one positioning threaded hole, and the head of the positioning bolt 310 is located below the fixing plate 100.

[0025] Specifically, the fixing plate 100 is a rectangular plate, and its lower surface can fit against the side of the rack. The length direction of the fixing plate 100 is the left-right direction mentioned above. Furthermore, the heads of the positioning bolts 310 are hexagonal, extending downwards from below the fixing plate 100, so that when the fixing plate 100 fits against the side of the rack, the heads of the two positioning bolts 310 can contact the tooth surface, thus ensuring the stability of the fixing plate 100 during its sliding from the tooth root to the tooth tip. Furthermore, the scribing needle 210 is made of a material with a hardness greater than that of the rack, thus ensuring its stability when changing lines on the rack. Since the scribing needle 210 is perpendicular to the fixing plate 100 and located at the front end of the fixing plate 100, it can form scribing marks on the side of the rack when the fixing plate 100 slides. The perpendicular arrangement of the line connecting the two positioning bolts 310 to the adjusting rod 220 ensures the stability of the scribing marks left by the scribing needle 210 during the sliding of the fixing plate 100. Therefore, when the fixing plate 100 slides on the two tooth surfaces of the same tooth, the intersection of the two scratches is located on the center line of the tooth apex, which can quickly determine its center line and improve the efficiency of center line confirmation.

[0026] During operation, the fixing plate 100 is brought into contact with the side of the rack whose center line is to be measured. The head of the positioning bolt 310 is then brought into contact with one tooth surface, and the tip of the scribing needle 210 is brought into contact with the side of the rack. The fixing plate 100 is slid from the tooth root to the tooth tip, while maintaining the head of the positioning bolt 310 in contact with the tooth surface. At this time, the scribing needle 210 forms a scribing arc on the side of the rack. Then, using the same method, the head of the positioning bolt 310 is brought into contact with the other tooth surface, and the fixing plate 100 is slid to form another scribing arc, which intersects. Since the intersection point is located on the center line of the tooth tip, a line is drawn vertically from this point to obtain the rack center line.

[0027] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the marking assembly also includes at least two adjusting bolts 230. The fixing plate 100 has at least two adjusting threaded holes, and multiple adjusting threaded holes are spaced apart sequentially in the left-right direction. The adjusting rod 220 has a through-groove adjusting groove 221 extending in the left-right direction. The head diameter of the adjusting bolt 230 is larger than the width of the adjusting groove 221. The adjusting bolts 230 are installed in the adjusting grooves 221, and each adjusting bolt 230 is inserted into one adjusting threaded hole.

[0028] Specifically, the two adjusting bolts 230 restrict the rotation of the adjusting rod 220, allowing it to move only in the left-right direction on the fixed plate 100 under the constraints of the adjusting groove 221 and the adjusting bolts 230. This prevents the right end of the adjusting rod 220 from extending to the right, thereby controlling the changing position of the scribing needle 210. Therefore, the adjusting groove 221 and the adjusting bolts 230 allow for changing the line of racks of different sizes, increasing the applicability of the tool.

[0029] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the scribing assembly also includes a fastening bolt 240, and the scribing needle 210 is slidably inserted into the mounting hole. The right end of the adjusting rod 220 is provided with a fastening threaded hole communicating with the mounting hole, the fastening threaded hole extending radially along the mounting hole, and the fastening bolt 240 is installed in the fastening threaded hole.

[0030] Specifically, since the scribing needle 210 can be adjusted up and down within the mounting hole, the fastening bolt 240 can tighten and adjust the scribing needle 210, thereby changing the length of the extended scribing needle 210 to compensate for the wear length of the scribing needle 210, ensuring the stability of the scribing line, and also allowing the scribing needle 210 to be replaced.

[0031] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the positioning assembly also includes two positioning blocks 320. The positioning blocks 320 are rectangular blocks, each of which is fixed to the head of a positioning bolt 310 and is parallel to each other on the lower surface of the fixing plate 100.

[0032] Specifically, the positioning block 320 increases the contact area between the positioning bolt 310 and the tooth surface, thereby further increasing the stability of the fixed plate 100 during sliding. Furthermore, since the tooth surface is mostly curved and set with a certain curvature, the two positioning blocks 320 can adjust to form a certain included angle according to the rotation of the positioning bolt 310, thereby further increasing the stability through the curved contact between the positioning block 320 and the tooth surface. Furthermore, the heads of the positioning blocks 320 and the positioning bolt 310 are welded together.

[0033] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A rack centerline marking tool, characterized in that, include: Fixing plate; A scribing assembly, the scribing assembly including an adjusting rod and a scribing needle; The adjusting rod extends in the left-right direction and is slidably disposed on the upper surface of the fixing plate in the left-right direction; the right end of the adjusting rod is located on the outside of the fixing plate, and the right end is provided with a through mounting hole; the scribing needle is inserted into the mounting hole. The positioning assembly includes two positioning bolts; the fixing plate has two positioning threaded holes at the left end of the adjusting rod, and the two positioning threaded holes are symmetrically arranged about the adjusting rod; the line connecting the two positioning threaded holes is perpendicular to the adjusting rod; each positioning bolt is installed in one of the positioning threaded holes, and the head of the positioning bolt is located below the fixing plate.

2. The rack centerline marking tool according to claim 1, characterized in that, The marking assembly also includes at least two adjusting bolts; The fixed plate has at least two adjusting threaded holes; a plurality of adjusting threaded holes are arranged at intervals in the left-right direction; the adjusting rod is provided with an adjusting groove that extends vertically; the adjusting groove extends in the left-right direction; the head diameter of the adjusting bolt is greater than the width of the adjusting groove; the adjusting bolt is installed in the adjusting groove, and each adjusting bolt is inserted into one of the adjusting threaded holes.

3. The rack centerline marking tool according to claim 1, characterized in that, The marking assembly also includes a fastening bolt; the marking needle is slidably inserted into the mounting hole. The right end of the adjusting rod is provided with a fastening threaded hole communicating with the mounting hole; the fastening threaded hole extends radially along the mounting hole; the fastening bolt is installed in the fastening threaded hole.

4. The rack centerline marking tool according to claim 1, characterized in that, The positioning assembly further includes two positioning blocks; the positioning blocks are rectangular blocks; each rectangular block is fixed to the head of a positioning bolt and is parallel to each other on the lower surface of the fixing plate.

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