CN215153465U - Multifunctional tool ruler for mechanical design and machining - Google Patents

Abstract

The application discloses multi-functional instrument chi is used in machining design, including cross bar, adjustment mechanism, receiving mechanism and fixed establishment, the bottom terminal surface fixedly connected with dipperstick of cross bar, the top terminal surface of cross bar laminates with the bottom of diaphragm mutually. This application passes through the sliding connection of connecting block and spacing sleeve and spacing groove, be convenient for auxiliary ruler and the sliding connection who accomodates the groove, during the supplementary chi slides, elastic potential energy through first spring drives the stopper and slides, make the first fixture block with the stopper rigid coupling block with corresponding first draw-in groove mutually block with, and then be convenient for fixed after the auxiliary ruler slides, cooperation between the first draw-in groove of a plurality of and the first fixture block that is equipped with on the spacing inslot wall, be convenient for adjust the length of auxiliary ruler according to the drawing size of difference, the dipperstick overlength when the mapping has been avoided the drawing personnel and has been used inconveniently.

Description

Multifunctional tool ruler for mechanical design and machining

Technical Field

The application relates to the technical field of mechanical design tool rulers, in particular to a multifunctional tool ruler for mechanical design and machining.

Background

The mechanical design is a working process which is used for conceiving, analyzing and calculating the working principle, structure, motion mode, force and energy transmission mode, the material and shape size of each part, a lubricating method and the like of the machine according to the use requirement and converting the working principle, the structure, the motion mode, the force and energy transmission mode, the material and shape size of each part, the lubricating method and the like into a specific description to be used as a manufacturing basis.

In mechanical design, drawing tools such as rulers, set squares, protractors, compasses and the like are inevitably used in hand-drawing design drawings, a plotter needs to carry various drawing tools every time of drawing, the situation that the drawing tools are forgotten to carry or are lost is easily caused, and the drawing tools are too single in function and inconvenient to use, so that the hand-drawing design drawings are particularly not suitable for drawing on drawings with different sizes. Therefore, a multifunctional tool ruler for machining is provided to solve the above problems.

Disclosure of Invention

A multifunctional tool ruler for mechanical design and processing comprises a cross ruler, an adjusting mechanism, a containing mechanism and a fixing mechanism, wherein the bottom end face of the cross ruler is fixedly connected with a measuring ruler, and the top end face of the cross ruler is attached to the bottom end of a transverse plate;

the adjusting mechanism comprises an auxiliary ruler, a connecting block, a limiting sleeve, a first spring, a limiting block, a first clamping block and a bottom plate, wherein an accommodating groove is formed in the right side end face of the measuring ruler, a limiting groove is formed in the left side inner wall of the accommodating groove, a first clamping groove is formed in the left side inner wall of the limiting groove, the auxiliary ruler is connected in the accommodating groove in a sliding mode, the left side end face of the auxiliary ruler is fixedly connected with the connecting block, the left side end face of the connecting block is fixedly connected with the limiting sleeve, the inner cavity of the limiting sleeve is fixedly connected with the first spring, the other end of the first spring is fixedly connected with the right end of the limiting block, the left end of the limiting block is fixedly connected with the first clamping block, and the left end of the first clamping block penetrates through the left side end face of the limiting sleeve and is attached to the first clamping groove;

the storage mechanism comprises a first magnetic block, a second magnetic block, a bottom plate, a connecting rod, a square block, a second spring, a T-shaped block, a top plate and a second clamping block, the bottom end face of the measuring scale on the left side of the limiting groove is provided with a connecting groove, the top end of the connecting groove is communicated with the groove, the bottom end face of the auxiliary scale is fixedly connected with the top end of the bottom plate, the left side of the bottom plate is rotatably connected with the connecting rod, the top end of the connecting rod is fixedly connected with the square block, the bottom end of the inner cavity of the square block is fixedly connected with the second spring, the top end of the second spring is fixedly connected with the bottom end of the T-shaped block, the top end of the T-shaped block penetrates through the top end of the square block and is fixedly connected with the bottom end face of the top plate, the top end face of the top plate is attached to the top end of the inner wall of the circular groove, and the two sides of the bottom end face of the square block are fixedly connected with the second clamping block;

the fixed establishment includes fixed block, protractor, rotation chi, locating piece and bolt, the top terminal surface fixedly connected with protractor of diaphragm, the constant head tank has all been seted up to the top terminal surface both sides of horizontal chi, the thread groove has all been seted up to the both sides terminal surface of horizontal chi, the thread groove runs through the constant head tank, the equal fixedly connected with fixed block of both sides terminal surface of diaphragm, the bottom terminal surface fixedly connected with locating piece of fixed block, locating piece and constant head tank sliding connection.

Furthermore, the top end of the inner wall of the accommodating groove is fixedly connected with a first magnetic block, the top end face of the auxiliary ruler is fixedly connected with a second magnetic block, and the top end of the second magnetic block is attached to the bottom end of the first magnetic block.

Furthermore, the cross section of the limiting groove is T-shaped, and the connecting block and the limiting sleeve are both connected with the limiting groove in a sliding mode.

Further, first fixture block and spacing sleeve's inner chamber sliding connection, the left end of first fixture block is the toper.

Furthermore, first draw-in groove has a plurality of, a plurality of first draw-in groove evenly distributes on the left side inner wall of spacing groove, first draw-in groove suits with first fixture block.

Further, the bottom fixedly connected with dwang of connecting rod, be equipped with the rotation hole on the bottom plate, the connecting rod suits with the rotation hole, connecting rod and spread groove sliding connection.

Further, the bottom terminal surface of square piece and the bottom terminal surface of circular slot are laminated mutually, square piece and circular slot sliding connection, square piece suits with the connecting slot, the inner chamber sliding connection of T type piece and square piece.

Furthermore, second clamping grooves are formed in two sides of the end face of the bottom of the circular groove, and the two second clamping grooves are respectively attached to the two second clamping blocks.

Furthermore, the positioning block is provided with a positioning hole corresponding to the thread groove, and the bolt penetrates through the positioning hole and is in threaded connection with the thread groove.

Furthermore, the top end face of the transverse plate is fixedly connected with an installation block, the installation block is rotatably connected with the bottom end of the rotating ruler through a rotating pin, an arc-shaped groove is formed in the protractor, and the rotating ruler is slidably connected with the arc-shaped groove.

The beneficial effect of this application is: the application provides a multifunctional tool chi is used in mechanical design processing convenient to accomodate regulation.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic overall structure diagram of an embodiment of the present application;

FIG. 2 is a schematic diagram of the overall internal structure of an embodiment of the present application;

FIG. 3 is an enlarged, partial schematic view of a portion of FIG. 2A according to an embodiment of the present application;

FIG. 4 is an enlarged, partial schematic view of a portion of FIG. 2 at B according to an embodiment of the present application;

FIG. 5 is an enlarged, partial schematic view of a portion of FIG. 2 at C according to an embodiment of the present application;

fig. 6 is a schematic bottom view of a bottom plate according to an embodiment of the present application.

In the figure: 1. the cross ruler comprises a cross ruler body, 2, a measuring ruler body, 3, a containing groove, 4, a first magnetic block, 5, an auxiliary ruler body, 6, a second magnetic block, 7, a limiting groove, 8, a first clamping groove, 9, a connecting block, 10, a limiting sleeve, 11, a first spring, 12, a limiting block, 13, a first clamping block, 14, a bottom plate, 15, a connecting groove, 16, a circular groove, 17, a second clamping groove, 18, a connecting rod, 19, a square block, 20, a second spring, 21, a T-shaped block, 22, a top plate, 23, a second clamping block, 24, a transverse plate, 25, a fixing block, 26, a protractor, 27, a rotating ruler, 28, a positioning groove, 29, a threaded groove, 30, a positioning block, 31 and a bolt.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1-6, a multifunctional tool ruler for mechanical design and processing includes a cross ruler 1, an adjusting mechanism, a receiving mechanism and a fixing mechanism, wherein a measuring ruler 2 is fixedly connected to the bottom end surface of the cross ruler 1, and the top end surface of the cross ruler 1 is attached to the bottom end of a transverse plate 24;

the adjusting mechanism comprises an auxiliary ruler 5, a connecting block 9, a limiting sleeve 10, a first spring 11, a limiting block 12, a first clamping block 13 and a bottom plate 14, the right side end face of the measuring scale 2 is provided with a containing groove 3, the left side inner wall of the containing groove 3 is provided with a limit groove 7, a first clamping groove 8 is arranged on the inner wall of the left side of the limiting groove 7, an auxiliary ruler 5 is connected in the accommodating groove 3 in a sliding way, the left end face of the auxiliary ruler 5 is fixedly connected with a connecting block 9, the left end face of the connecting block 9 is fixedly connected with a limiting sleeve 10, the inner cavity of the limiting sleeve 10 is fixedly connected with a first spring 11, the other end of the first spring 11 is fixedly connected with the right end of a limiting block 12, a first clamping block 13 is fixedly connected to the left end of the limiting block 12, and the left end of the first clamping block 13 penetrates through the left end face of the limiting sleeve 10 and is attached to the first clamping groove 8;

the containing mechanism comprises a first magnetic block 4, a second magnetic block 6, a bottom plate 14, a connecting rod 18, a square block 19, a second spring 20, a T-shaped block 21, a top plate 22 and a second clamping block 23, a connecting groove 15 is formed in the bottom end face of the measuring scale 2 on the left side of a limiting groove 7, the top end of the connecting groove 15 is communicated with the groove, the bottom end surface of the auxiliary ruler 5 is fixedly connected with the top end of the bottom plate 14, a connecting rod 18 is rotatably connected to the left side of the bottom plate 14, a square block 19 is fixedly connected to the top end of the connecting rod 18, the bottom end of the inner cavity of the square block 19 is fixedly connected with a second spring 20, the top end of the second spring 20 is fixedly connected with the bottom end of a T-shaped block 21, the top end of the T-shaped block 21 penetrates through the top end of the square block 19 and is fixedly connected with the bottom end face of the top plate 22, the top end surface of the top plate 22 is attached to the top end of the inner wall of the circular groove 16, and two sides of the bottom end surface of the square block 19 are fixedly connected with second clamping blocks 23;

fixing mechanism includes fixed block 25, protractor 26, rotation chi 27, locating piece 30 and bolt 31, the top end face fixedly connected with protractor 26 of diaphragm 24, constant head tank 28 has all been seted up to the top end face both sides of cross ruler 1, thread groove 29 has all been seted up to the both sides terminal surface of cross ruler 1, thread groove 29 runs through constant head tank 28, the equal fixedly connected with fixed block 25 of the both sides terminal surface of diaphragm 24, the bottom end face fixedly connected with locating piece 30 of fixed block 25, locating piece 30 and constant head tank 28 sliding connection.

The top end of the inner wall of the accommodating groove 3 is fixedly connected with a first magnetic block 4, the top end face of the auxiliary ruler 5 is fixedly connected with a second magnetic block 6, and the top end of the second magnetic block 6 is attached to the bottom end of the first magnetic block 4; the cross section of the limiting groove 7 is T-shaped, and the connecting block 9 and the limiting sleeve 10 are both connected with the limiting groove 7 in a sliding manner; the first clamping block 13 is connected with the inner cavity of the limiting sleeve 10 in a sliding mode, and the left end of the first clamping block 13 is conical; the number of the first clamping grooves 8 is multiple, the multiple first clamping grooves 8 are uniformly distributed on the inner wall of the left side of the limiting groove 7, and the first clamping grooves 8 are matched with the first clamping blocks 13; the bottom end of the connecting rod 18 is fixedly connected with a rotating rod, a rotating hole is formed in the bottom plate 14, the connecting rod 18 is matched with the rotating hole, and the connecting rod 18 is connected with the connecting groove 15 in a sliding mode; the bottom end face of the square block 19 is attached to the bottom end face of the circular groove 16, the square block 19 is in sliding connection with the circular groove 16, the square block 19 is matched with the connecting groove 15, and the T-shaped block 21 is in sliding connection with the inner cavity of the square block 19; two sides of the bottom end face of the circular groove 16 are respectively provided with a second clamping groove 17, and the two second clamping grooves 17 are respectively attached to the two second clamping blocks 23; the positioning block 30 is provided with a positioning hole corresponding to the thread groove 29, and the bolt 31 penetrates through the positioning hole and is in threaded connection with the thread groove 29; the top end face of the transverse plate 24 is fixedly connected with an installation block, the installation block is rotatably connected with the bottom end of the rotating ruler 27 through a rotating pin, an arc-shaped groove is formed in the protractor 26, and the rotating ruler 27 is slidably connected with the arc-shaped groove.

When the auxiliary ruler is used, electrical components appearing in the application are externally connected with a power supply and a control switch when in use, the auxiliary ruler 5 is conveniently in sliding connection with the accommodating groove 3 through the sliding connection of the connecting block 9 and the limiting sleeve 10, when the auxiliary ruler 5 is slid, the limiting block 12 is driven to slide through the elastic potential energy of the first spring 11, so that the first clamping block 13 fixedly connected with the limiting block 12 is clamped with the corresponding first clamping groove 8, and further the auxiliary ruler 5 is conveniently fixed after sliding, the length of the auxiliary ruler 5 is conveniently adjusted according to different drawing sizes through the matching between the first clamping grooves 8 and the first clamping blocks 13 arranged on the inner wall of the limiting groove 7, the inconvenience in use caused by the overlong measuring scale 2 of a drawing worker during drawing is avoided, the inconvenience in use caused by the mutual adsorption and the attachment of the first magnetic block 4 and the second magnetic block 6 is convenient for the fixation after the auxiliary ruler 5 slides into the accommodating groove 3 when not in use, through the connecting groove 15 arranged at the bottom end of the measuring scale 2, the square block 19 can conveniently slide into the circular groove 16, through continuously extruding the rotating rod, the square block 19 can completely enter the circular groove 16, the second spring 20 is compressed, the square block 19 is rotated, the two second clamping blocks 23 can slide into the second clamping grooves 17, the T-shaped block 21 is upwards pushed by the elastic potential energy of the compressed second spring 20, and further the top plate 22 is driven to upwards extrude the top end of the circular groove 16, so that the square block 19 is driven by the reaction force to clamp the second clamping blocks 23 with the second clamping grooves 17, the auxiliary scale 5 is further fixed in the accommodating groove 3, the auxiliary scale is convenient to be accommodated, through the sliding connection between the arc-shaped groove arranged on the protractor 26 and the rotating scale 27, the drawing personnel can conveniently and accurately and quickly draw, through the positioning groove 28 arranged on the transverse scale 1, the positioning hole on the positioning block 30 is convenient to correspond to the thread groove 29, the bolt 31 penetrates through the positioning hole and is in threaded connection with the threaded groove 29, so that the positioning block 30 can be conveniently fixed in the positioning groove 28, the transverse plate 24 and the protractor 26 can be conveniently fixed on the cross ruler 1, and the protractor 26 and the cross ruler 1 can be conveniently detached and installed during drawing.

The application has the advantages that:

1. the auxiliary ruler is connected with the accommodating groove in a sliding mode through the connecting block and the limiting sleeve in a sliding mode, the auxiliary ruler is convenient to slide in the accommodating groove, when the auxiliary ruler slides, the limiting block is driven to slide through elastic potential energy of the first spring, the first clamping block fixedly connected with the limiting block is clamped with the corresponding first clamping groove, and therefore the auxiliary ruler is convenient to fix after sliding, the length of the auxiliary ruler can be adjusted conveniently according to different drawing sizes through matching of the first clamping grooves formed in the inner wall of the limiting groove and the first clamping block, and inconvenience in use due to the fact that a drawing worker does not measure the length too long in drawing is avoided;

2. according to the auxiliary ruler, the auxiliary ruler is convenient to slide into the containing groove and then fixed when not used through mutual adsorption and lamination of the first magnetic block and the second magnetic block, the square block can slide into the circular groove conveniently through the connecting groove formed in the bottom end of the measuring ruler, the square block can completely enter the circular groove through continuous extrusion of the rotating rod, the second spring is compressed, the square block is rotated, the two second clamping blocks can slide into the second clamping groove, the T-shaped block is pushed upwards through elastic potential energy of the compressed second spring, the top plate is driven to extrude the top end of the circular groove upwards, the square block is driven to be clamped with the second clamping groove through reaction force, the auxiliary ruler is further fixed in the containing groove and is convenient to contain;

3. this application is through the arc wall that is equipped with on the protractor and the sliding connection between the chi rotates, the drawing personnel of being convenient for are accurate quick drawing more, through the constant head tank that is equipped with on the cross bar, the locating hole on the locating plate of being convenient for is corresponding with the thread groove, run through the threaded connection of locating hole and thread groove through the bolt, the locating piece of being convenient for is fixed among the constant head tank, and then diaphragm and the protractor of being convenient for are fixed on the cross bar, the personnel's of not only being convenient for carry, be convenient for again dismantle and install protractor and cross bar when the drawing.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The utility model provides a multi-functional instrument chi is used in mechanical design processing which characterized in that: the measuring device comprises a cross ruler (1), an adjusting mechanism, a containing mechanism and a fixing mechanism, wherein the bottom end face of the cross ruler (1) is fixedly connected with a measuring scale (2), and the top end face of the cross ruler (1) is attached to the bottom end of a transverse plate (24);

the adjusting mechanism comprises an auxiliary ruler (5), a connecting block (9), a limiting sleeve (10), a first spring (11), a limiting block (12), a first clamping block (13) and a bottom plate (14), wherein a containing groove (3) is formed in the right side end face of the measuring ruler (2), a limiting groove (7) is formed in the left side inner wall of the containing groove (3), a first clamping groove (8) is formed in the left side inner wall of the limiting groove (7), the auxiliary ruler (5) is connected in the containing groove (3) in a sliding mode, the left side end face of the auxiliary ruler (5) is fixedly connected with the connecting block (9), the left side end face of the connecting block (9) is fixedly connected with the limiting sleeve (10), the first spring (11) is fixedly connected to the inner cavity of the limiting sleeve (10), the other end of the first spring (11) is fixedly connected with the right end of the limiting block (12), and the first clamping block (13) is fixedly connected to the left end of the limiting block (12), the left end of the first clamping block (13) penetrates through the left end face of the limiting sleeve (10) and is attached to the first clamping groove (8);

the storage mechanism comprises a first magnetic block (4), a second magnetic block (6), a bottom plate (14), a connecting rod (18), a square block (19), a second spring (20), a T-shaped block (21), a top plate (22) and a second clamping block (23), the bottom end face of the measuring scale (2) at the left side of the limiting groove (7) is provided with a connecting groove (15), the top end of the connecting groove (15) is communicated with the groove, the bottom end face of the auxiliary scale (5) is fixedly connected with the top end of the bottom plate (14), the left side of the bottom plate (14) is rotatably connected with the connecting rod (18), the top end of the connecting rod (18) is fixedly connected with the square block (19), the bottom end of an inner cavity of the square block (19) is fixedly connected with the second spring (20), the top end of the second spring (20) is fixedly connected with the bottom end of the T-shaped block (21), the top end of the T-shaped block (21) penetrates through the top end of the square block (19) and is fixedly connected with the bottom end face of the top plate (22), the top end face of the top plate (22) is attached to the top end of the inner wall of the circular groove (16), and two sides of the bottom end face of the square block (19) are fixedly connected with second clamping blocks (23);

fixing mechanism includes fixed block (25), protractor (26), rotation chi (27), locating piece (30) and bolt (31), top terminal surface fixedly connected with protractor (26) of diaphragm (24), constant head tank (28) have all been seted up to the top terminal surface both sides of diaphragm (1), thread groove (29) have all been seted up to the both sides terminal surface of diaphragm (1), thread groove (29) run through constant head tank (28), the equal fixedly connected with fixed block (25) of both sides terminal surface of diaphragm (24), the bottom terminal surface fixedly connected with locating piece (30) of fixed block (25), locating piece (30) and constant head tank (28) sliding connection.

2. The multifunctional tool rule for machining design according to claim 1, characterized in that: the auxiliary ruler is characterized in that a first magnetic block (4) is fixedly connected to the top end of the inner wall of the accommodating groove (3), a second magnetic block (6) is fixedly connected to the top end face of the auxiliary ruler (5), and the top end of the second magnetic block (6) is attached to the bottom end of the first magnetic block (4).

3. The multifunctional tool rule for machining design according to claim 1, characterized in that: the cross section of the limiting groove (7) is T-shaped, and the connecting block (9) and the limiting sleeve (10) are both in sliding connection with the limiting groove (7).

4. The multifunctional tool rule for machining design according to claim 1, characterized in that: the first clamping block (13) is connected with the inner cavity of the limiting sleeve (10) in a sliding mode, and the left end of the first clamping block (13) is conical.

5. The multifunctional tool rule for machining design according to claim 1, characterized in that: first draw-in groove (8) have a plurality of, a plurality of first draw-in groove (8) even distribution is on the left side inner wall of spacing groove (7), first draw-in groove (8) suit with first fixture block (13).

6. The multifunctional tool rule for machining design according to claim 1, characterized in that: the bottom fixedly connected with dwang of connecting rod (18), be equipped with on bottom plate (14) and rotate the hole, connecting rod (18) suit with rotating the hole, connecting rod (18) and spread groove (15) sliding connection.

7. The multifunctional tool rule for machining design according to claim 1, characterized in that: the bottom terminal surface of square piece (19) laminates with the bottom terminal surface of circular slot (16) mutually, square piece (19) and circular slot (16) sliding connection, square piece (19) suit with spread groove (15), the inner chamber sliding connection of T type piece (21) and square piece (19).

8. The multifunctional tool rule for machining design according to claim 1, characterized in that: and second clamping grooves (17) are formed in two sides of the end face of the bottom of the circular groove (16), and the second clamping grooves (17) are respectively attached to the two second clamping blocks (23).

9. The multifunctional tool rule for machining design according to claim 1, characterized in that: the positioning block (30) is provided with a positioning hole corresponding to the thread groove (29), and the bolt (31) penetrates through the positioning hole and is in threaded connection with the thread groove (29).

10. The multifunctional tool rule for machining design according to claim 1, characterized in that: the top end face of the transverse plate (24) is fixedly connected with an installation block, the installation block is rotatably connected with the bottom end of the rotating ruler (27) through a rotating pin, an arc-shaped groove is formed in the protractor (26), and the rotating ruler (27) is slidably connected with the arc-shaped groove.

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