Multifunctional digital display bevel protractor

Abstract

The multifunctional digital display angle ruler comprises an upper ruler blank, a lower ruler blank, an anti-falling assembly and a clamping assembly, the upper ruler blank is rotationally connected with the lower ruler blank, a gasket is arranged between the upper ruler blank and the lower ruler blank, a pin column is arranged below the gasket, and the pin column is riveted to the lower ruler blank. Through the clamping assembly, when the rotary knob is twisted, the rotary knob descends along the lower cover shell, meanwhile, the brake pad on the lower portion is pressed downwards, the upper ruler blank is pressed downwards through the brake pad, the friction force of the upper ruler blank and the lower ruler blank is increased under the effect of the gasket, and therefore the bevel protractor is not prone to rotating in the using and measuring process, and the measuring precision is not affected.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, and in particular to a multifunctional digital display angle ruler. Background Art

[0002] Digital angle rulers are widely used in many fields such as machinery manufacturing, automobile maintenance, construction engineering, woodworking, etc. In machinery manufacturing, it can be used for angle measurement and precision processing; in construction engineering, it can be used for angle measurement and wiring of buildings; in woodworking, it can be used for angle measurement and precision cutting. In addition, digital angle rulers are also widely used in various manufacturing industries, such as the production and processing processes of automobiles, aircraft, electronics and other industries.

[0003] Digital angle rulers usually use button batteries of specific specifications as their power source. The battery structure is roughly based on a digital woodworking angle ruler disclosed in "CN216432739U". By placing a 3V battery into the battery mounting slot of the upper seat and then tightening the battery cover, the positive and negative poles on the PCB board are connected. However, during the actual installation or disassembly process, the friction generated by the battery holder when fixing the battery can easily cause the battery to be damaged or even leak. In addition, when disassembling or installing the battery, the positive or negative contact piece needs to be pulled apart before the battery can be inserted, which is inconvenient to operate. Accordingly, the present application proposes a multifunctional digital angle ruler. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multifunctional digital display angle ruler.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A multifunctional digital display angle ruler, comprising an upper ruler blank, a lower ruler blank, an anti-drop component and a clamping component; The upper ruler blank is rotatably connected to the lower ruler blank, a gasket is provided between the upper ruler blank and the lower ruler blank, a pin is provided below the gasket, and the pin is riveted to the lower ruler blank; The anti-falling component is used to prevent the screw from falling off. The anti-falling component is composed of a battery seat, a screw seat, and a screw. The battery seat is slidably connected with a screw, and the screw is threadedly connected with the screw seat. The battery seat is provided with a slot, and the battery seat is provided with a mounting component and a stabilizing component. The mounting component is used to avoid scratches when installing a button battery, and the stabilizing component is used to make the battery seat more stable for the installation of the battery; The clamping assembly is used to clamp the upper scale blank and the lower scale blank. The clamping assembly consists of a knob, a brake pad and a lower cover shell. The lower cover shell is arranged on the upper scale blank, the brake pad is clamped in the lower cover shell, and the knob is threadedly connected to the outer side of the lower cover shell.

[0006] Preferably, a fixed grid seat is fixedly connected to the top of the pin by screws, a spring gasket is provided on the outside of the fixed grid seat, an electronic display component is provided above the fixed grid seat, the electronic display component is used to display the angle between the upper scale blank and the lower scale blank, the bottom of the pin is hexagonal, a bump is provided at the connection between the battery seat and the screw, the knob is provided on the brake pad, and the brake pad is provided above the upper scale blank.

[0007] Preferably, the electronic display component includes a PCB board, a touch button, an EVA pad, a conductive adhesive, and a liquid crystal. The touch button is fixedly installed on the top of the PCB board, one side of the touch button is fixedly connected to the EVA pad, the EVA pad is glued to the conductive adhesive, and the conductive adhesive is glued to the liquid crystal.

[0008] Preferably, the mounting assembly includes a first rubber wheel, two first wheel frames, a second rubber wheel, and two second wheel frames, the two first wheel frames are fixedly connected under the battery holder, the first rubber wheel is rotatably connected to the first wheel frame, the two second wheel frames are fixedly connected under the battery holder, and the second rubber wheel is rotatably connected between the two second wheel frames.

[0009] Preferably, the stabilizing assembly comprises a rod hook, a first bevel gear and a second bevel gear, the first bevel gear is rotatably connected in the battery holder, the rod hook is fixedly connected at the center of the first bevel gear, and the second bevel gear is rotatably connected to the first wheel frame.

[0010] Preferably, a positive contact piece is welded on the PCB board, a negative contact piece is provided on one side of the positive contact piece and welded on the PCB board, button batteries are provided on the positive contact piece and the negative contact piece, the button batteries are attached to the arc surfaces of the first rubber wheel and the second rubber wheel, a limit assembly is provided on one side of the button battery, the limit assembly is used to limit the positive contact piece when removing or installing the button battery, an upper cover shell is provided above the liquid crystal and installed on the outside of the PCB board, and a glass sheet is glued to the top of the upper cover shell.

[0011] Preferably, the first bevel gear is rotatably connected in the slot, the first bevel gear is meshingly connected with the second bevel gear, a rotating shaft is fixedly connected at the center of the second bevel gear, and one end of the rotating shaft away from the second bevel gear is fixedly connected to the first rubber wheel.

[0012] Preferably, the limiting assembly comprises a hook, a limiting block, a spring block and a first spring, the hook is fixedly connected to the positive contact sheet, the limiting block is fixedly connected to the hook, the first spring is fixedly connected to the PCB board, and one end of the first spring away from the PCB board is fixedly connected to the spring block.

[0013] Preferably, a spring seat is provided on the outer side of the first spring and is fixedly connected to the PCB board, a pressing block is fixedly connected to the outer side of the spring block, a second spring is fixedly connected under the pressing block, one end of the second spring away from the pressing block is fixedly connected to the PCB board, and the pressing block and the spring block are slidably connected to the spring seat.

[0014] Preferably, the surfaces of the upper and lower ruler blanks are provided with scales, the lower cover shell, the PCB board and the upper cover shell are provided with screw holes, and the three groups of screw holes correspond to each other in upper and lower positions.

[0015] The present invention has the following beneficial effects: Through the anti-drop assembly, when the screw is loosened and leaves the screw seat, the battery holder and the battery can be taken out normally, and the protrusion inside the battery holder will limit the two ends of the screw, so that after the battery holder is taken out, the screw will not fall out or be taken out from the battery holder, or be taken out and swallowed by children, endangering life safety.

[0016] Through the clamping assembly, when the knob is twisted, the brake pad below is pressed down while the knob is lowered along the lower cover shell. The brake pad presses the upper scale blank downward, so that the friction between the upper scale blank and the lower scale blank is increased under the action of the gasket, so that the angle ruler will not rotate easily during the measurement process, thereby affecting the measurement accuracy.

[0017] The pin is pressed into the lower blank by a riveting machine. Since the bottom end of the pin is hexagonal in shape, when the pin is pressed into the lower blank, the hexagonal bottom end of the pin is stuck in the lower blank, so that the pin can be more stably connected to the lower blank, making the overall installation more stable.

[0018] When installing the button battery through the installation component, after placing the button battery on the negative contact sheet, loosen the screws of the battery holder to rotate the battery holder, and when the first rubber wheel contacts the button battery, press the button battery down and roll over the button battery at the same time, thereby avoiding direct friction between the battery holder and the button battery, which may cause battery damage or even leakage.

[0019] Through the limiting component, when the button battery needs to be disassembled or installed, the positive contact piece is pushed to one side, and the pull hook on the positive contact piece pushes the spring block, and finally the limiting block on the pull hook is clamped on the spring block to limit the positive contact piece, making it easy to place the button battery on the negative contact piece or take it out, avoiding manual limiting of the positive contact piece.

[0020] By stabilizing the assembly, during the rotation of the battery holder, the first rubber wheel drives the second bevel gear to rotate the first bevel gear, thereby causing the rod hook to rotate continuously. When it rotates to the spring block, the battery holder just closes the button battery, and the spring block is released from the limit on the positive contact piece by pressing the pressing block. Then, the pressing block is released so that the spring block rebounds upward under the action of the first spring, and the hook on the rod hook is clamped in the limit position, thereby preventing the battery holder from shaking easily and making the installation of the button battery more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a multifunctional digital angle ruler proposed by the present invention; Figure 2 An exploded diagram of the connection structure of a multifunctional digital angle ruler proposed by the present invention; Figure 3 A schematic diagram of the connection structure of components on a PCB board of a multifunctional digital angle ruler proposed by the present invention; Figure 4 This is a schematic diagram of the connection structure of a multifunctional digital angle ruler spring seat, a positive contact piece and a limit assembly proposed by the present invention; Figure 5 A schematic diagram of the connection structure of a multifunctional digital angle ruler battery holder, a mounting assembly and a stabilizing assembly proposed by the present invention; Figure 6 for Figure 5 The enlarged schematic diagram at A in the middle; Figure 7 for Figure 6 The enlarged schematic diagram of point B in the middle; Figure 8 This is a schematic diagram of the connection structure of the multifunctional digital angle ruler installation assembly, battery holder, slot hole and other components proposed by the present invention; Fig. 9 This is a schematic diagram of the connection structure of the first bevel gear, the second bevel gear, the rotating shaft and the first rubber wheel of a multifunctional digital angle ruler proposed by the present invention; Fig.10 This is a schematic diagram of the connection structure of the positive contact piece, negative contact piece, PCB board and other components of a multifunctional digital display angle ruler proposed by the present invention; Fig.11 This is a schematic diagram of the connection structure of the pressing block, rod hook, second spring and other components of a multifunctional digital angle ruler proposed by the present invention; Fig.12 A cross-sectional view of the internal components of a multifunctional digital angle ruler knob proposed by the present invention; Fig.13 This is a schematic diagram of the connection structure of the multifunctional digital angle ruler knob, pin, brake pad and other parts proposed by the present invention; Fig.14A schematic diagram of the connection structure of the upper scale blank, the lower scale blank, and the pin of a multifunctional digital angle ruler proposed by the present invention, and a cross-sectional view of the lower cover shell, the knob, and the brake pad; Fig.15 The present invention provides an internal cross-sectional view of a battery holder and a screw holder of a multifunctional digital angle ruler.

[0022] In the figure: 1 upper ruler blank, 2 lower ruler blank, 3 scale, 4 glass sheet, 5 upper cover, 6 liquid crystal, 7 knob, 8 conductive glue, 9 EVA pad, 10 battery holder, 11 touch button, 12 button battery, 13 PCB board, 14 lower cover, 15 fixed grid seat, 16 elastic gasket, 17 brake pad, 18 gasket, 19 pin, 20 positive contact piece, 21 hook, 22 slot, 23 first wheel frame, 24 second bevel gear, 25 rotating shaft, 26 first rubber wheel, 27 second rubber wheel, 28 second wheel frame, 29 first bevel gear, 30 limit block, 31 spring block, 32 spring seat, 33 first spring, 34 negative contact piece, 35 pressing block, 36 rod hook, 37 second spring, 38 screw seat, 39 screw, 40 screw hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Embodiment 1

[0024] Reference Figure 1-Figure 15 , a multifunctional digital display angle ruler, comprising an upper ruler blank 1, a lower ruler blank 2, an anti-falling component and a clamping component; The upper scale blank 1 is rotatably connected to the lower scale blank 2, a gasket 18 is provided between the upper scale blank 1 and the lower scale blank 2, and scales are provided on the surfaces of the upper scale blank 1 and the lower scale blank 2. Screw holes 40 are provided on the lower cover shell 14, the PCB board 13 and the upper cover shell 5, and the three groups of screw holes 40 correspond to each other in the upper and lower positions. A pin 19 is provided below the gasket 18, and the pin 19 is riveted to the lower scale blank 2. The pin 19 has a hexagonal shape below, and a fixed grid seat 15 is fixedly connected to the pin 19 by screws above the pin 19. A spring gasket 16 is provided on the outside of the fixed grid seat 15, and an electronic display component is provided above the fixed grid seat 15. The electronic display component is used to display the angle between the upper scale blank 1 and the lower scale blank 2.

[0025] The anti-falling component consists of a battery holder 10, a screw holder 38, and a screw 39. The screw 39 is slidably connected inside the battery holder 10, and the screw 39 is threadedly connected to the screw holder 38. A protrusion is provided at the connection between the battery holder 10 and the screw 39, which can limit the screw 39. A slot 22 is provided on the battery holder 10. The battery holder 10 is provided with an installation component and a stabilizing component. The installation component is used to avoid scratches when installing the button battery 12, and the stabilizing component is used to make the battery holder 10 more stable for installing the battery.

[0026] The clamping assembly consists of a knob 7, a brake pad 17 and a lower cover shell 14. The lower cover shell 14 is arranged on the upper scale blank 1. The brake pad 17 is clamped in the lower cover shell 14. The knob 7 is threadedly connected to the outside of the lower cover shell 14. The knob 7 is arranged on the brake pad 17. When the knob 7 is lowered, the brake pad 17 can be pressed downward. The brake pad 17 is arranged above the upper scale blank 1. When the brake pad 17 is lowered, the upper scale blank 1 can be pressed downward.

[0027] In this embodiment, the pin 19 is pressed into the lower scale blank 2 by a riveting machine, and the brake pad 17 and the lower cover shell 14 are assembled and installed on the upper scale blank 1 by screws. Then, the upper scale blank 1 assembly is assembled with the lower scale blank 2 by the outer circle of the pin 19, and the gasket 18 is clamped between the upper scale blank 1 and the lower scale blank 2. Then, the fixed grid seat 15 is installed on the end face of the pin 19 by screws, and the spring gasket 16 is placed on it, and then connected to the inner and outer threads of the lower cover shell 14 by the knob 7. Since the bottom end of the pin 19 is hexagonal in shape, when the pin 19 is pressed into the lower scale blank 2, the hexagonal bottom end of the pin 19 is stuck in the lower scale blank 2, so that the pin 19 can be more stably clamped in the lower scale blank 2, thereby making the overall installation more stable. Then, the screw is screwed into the screw hole 40, and the PCB board 13 and the upper cover shell 5 are installed on the lower cover shell 14. When it is necessary to clamp the upper scale blank 1 and the lower scale blank 2, the clamp is used. Tighten the assembly and twist the knob 7. While the knob 7 is lowered along the lower cover 14, the brake pad 17 below is pressed down. The brake pad 17 presses the upper ruler 1 downward, so that the friction between the upper ruler 1 and the lower ruler 2 is increased under the action of the gasket 18, so that the angle ruler will not rotate easily during the measurement process, thereby affecting the measurement accuracy. It is also worth mentioning that when the screw 39 is turned to make the screw 39 leave the screw seat 38, the battery holder 10 and the button battery 12 can be taken out normally, and the protrusion inside the battery holder 10 will limit the two ends of the screw 39, so that after the battery holder 10 is taken out, the screw 39 will not fall or be taken out from the inside of the battery holder 10, or be taken out and swallowed by children, endangering their life safety. Embodiment 2

[0028] Furthermore, different from the first embodiment, referring to Figure 2 and Figure 5-Figure 8 , the specific structure of the electronic display component and the installation component is as follows: The electronic display component includes a PCB board 13, a touch button 11, an EVA pad 9, a conductive glue 8, and a liquid crystal 6. The touch button 11 is fixedly installed on the top of the PCB board 13, one side of the touch button 11 is fixedly connected to the EVA pad 9, the EVA pad 9 is glued to the conductive glue 8, the conductive glue 8 is glued to the liquid crystal 6, an upper cover shell 5 is provided above the liquid crystal 6 and is installed on the outside of the PCB board 13, and a glass sheet 4 is glued to the top of the upper cover shell 5.

[0029] The mounting assembly includes a first rubber wheel 26, two first wheel frames 23, a second rubber wheel 27, and two second wheel frames 28. The two first wheel frames 23 are fixedly connected to the bottom of the battery holder 10. The first rubber wheel 26 is rotatably connected to the first wheel frame 23. The first rubber wheel 26 and the second rubber wheel 27 have the same diameter. The arc surface of the first rubber wheel 26 and the second rubber wheel 27 fits with the button battery 12, so that the button battery 12 can be clamped together with the negative contact sheet 34. The two second wheel frames 28 are fixedly connected to the bottom of the battery holder 10, and the second rubber wheel 27 is rotatably connected between the two second wheel frames 28.

[0030] In the embodiment, when the electronic display component is used, the dynamic PCB board 13 installed on the ruler blank and the fixed grid bar on the fixed grid are displaced to generate a voltage signal, which is processed by the MCU data to generate a digital signal and then transmitted to the liquid crystal 6 by the conductive glue 8 to display the measurement data, so that the user can view it in time. When the assembly is installed and used, when installing the button battery 12, after placing the button battery 12 on the negative contact sheet 34, the screw 39 of the battery holder 10 is loosened to rotate the battery holder 10. When the first rubber wheel 26 contacts the button battery 12, the button battery 12 is pressed down and rolled over the button battery 12 at the same time, thereby avoiding direct friction between the battery holder and the button battery 12, which may cause battery damage or even leakage. Embodiment 3

[0031] Furthermore, different from the first and second embodiments, referring to Figure 3-Figure 5 and Figure 9-11 The specific structures of the stabilizing component and the limiting component are as follows: The stabilizing component includes a rod hook 36, a first bevel gear 29 and a second bevel gear 24. The first bevel gear 29 is rotatably connected in the battery holder 10. The rod hook 36 is fixedly connected at the center of the first bevel gear 29. The second bevel gear 24 is rotatably connected to the first wheel frame 23. A slot 22 is provided on the battery holder 10. The first bevel gear 29 is rotatably connected in the slot 22. In this way, the rod hook 36 and the first bevel gear 29 can reduce space occupation. The first bevel gear 29 is meshedly connected with the second bevel gear 24. In this way, when the second bevel gear 24 rotates, it can drive the first bevel gear 29 to rotate. A rotating shaft 25 is fixedly connected at the center of the second bevel gear 24. The rotating shaft 25 is fixedly connected to the first rubber wheel 26 at one end away from the second bevel gear 24. In this way, when the first rubber wheel 26 rotates, it can drive the second bevel gear 24 to rotate through the rotating shaft 25.

[0032] The limiting assembly includes a hook 21, a limiting block 30, a spring block 31 and a first spring 33. The hook 21 is fixedly connected to the positive contact sheet 20, the limiting block 30 is fixedly connected to the hook 21, the first spring 33 is fixedly connected to the PCB board 13, one end of the first spring 33 away from the PCB board 13 is fixedly connected to the spring block 31, a spring seat 32 is provided on the outside of the first spring 33 and is fixedly connected to the PCB board 13, a pressing block 35 is fixedly connected to the outside of the spring block 31, a second spring 37 is fixedly connected below the pressing block 35, one end of the second spring 37 away from the pressing block 35 is fixedly connected to the PCB board 13, and the pressing block 35 and the spring block 31 are slidably connected to the spring seat 32.

[0033] In this embodiment, by means of the stabilizing assembly, during the rotation of the battery holder 10, the first rubber wheel 26 drives the second bevel gear 24 to rotate the first bevel gear 29, thereby causing the rod hook 36 to rotate continuously. When it rotates to the spring block 31, the battery holder 10 just closes the button battery 12, and the spring block 31 releases the limit on the positive contact sheet 20 by pressing the pressing block 35. Then, the pressing block 35 is released to allow the spring block 31 to rebound upward under the action of the first spring 33, and the hook on the rod hook 36 is clamped in the limit position. , so that the battery holder 10 is not easy to shake, and the installation of the button battery 12 is more stable. When the button battery needs to be disassembled or installed, the positive contact piece 20 is pushed to one side through the limiting component, and the hook 21 on the positive contact piece 20 pushes the spring block 31, and finally the limiting block 30 on the hook 21 is clamped on the spring block 31, so that the positive contact piece 20 is limited, which is convenient for placing the button battery 12 on the negative contact piece 34 or taking it out, avoiding manual limiting of the positive contact piece 20.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multifunctional digital angle ruler, characterized in that: It comprises an upper scale blank (1), a lower scale blank (2), an anti-falling component and a clamping component; The upper ruler blank (1) is rotatably connected to the lower ruler blank (2); a gasket (18) is provided between the upper ruler blank (1) and the lower ruler blank (2); a pin (19) is provided below the gasket (18); and the pin (19) is riveted to the lower ruler blank (2); The anti-falling component is used to prevent the screw from falling off, and the anti-falling component is composed of a battery seat (10), a screw seat (38), and a screw (39); the battery seat (10) is slidably connected with the screw (39), and the screw (39) is threadedly connected with the screw seat (38); a slot (22) is provided on the battery seat (10); a mounting component and a stabilizing component are provided on the battery seat (10); the mounting component is used to prevent scratches when installing a button battery (12), and the stabilizing component is used to make the battery seat (10) more stable for installing the battery; The clamping assembly is used to clamp an upper ruler blank (1) and a lower ruler blank (2), and the clamping assembly consists of a knob (7), a brake pad (17) and a lower cover shell (14); the lower cover shell (14) is arranged on the upper ruler blank (1), the brake pad (17) is clamped in the lower cover shell (14), and the knob (7) is threadedly connected to the outer side of the lower cover shell (14).

2. A multifunctional digital angle ruler according to claim 1, characterized in that: A fixed grid seat (15) is fixedly connected to the top of the pin (19) by means of screws, a spring washer (16) is provided on the outside of the fixed grid seat (15), an electronic display assembly is provided on the top of the fixed grid seat (15), and the electronic display assembly is used to display the angle between the upper scale blank (1) and the lower scale blank (2), the bottom of the pin (19) is hexagonal, a bump is provided at the connection between the battery seat (10) and the screw (39), the knob (7) is provided on the brake pad (17), and the brake pad (17) is provided on the top of the upper scale blank (1).

3. A multifunctional digital angle ruler according to claim 2, characterized in that: The electronic display assembly comprises a PCB board (13), a light touch button (11), an EVA pad (9), a conductive adhesive (8), and a liquid crystal (6); the light touch button (11) is fixedly mounted on the top of the PCB board (13); one side of the light touch button (11) is fixedly connected to the EVA pad (9); the EVA pad (9) is glued to the conductive adhesive (8); and the conductive adhesive (8) is glued to the liquid crystal (6).

4. A multifunctional digital angle ruler according to claim 1, characterized in that: The mounting assembly comprises a first rubber wheel (26), two first wheel frames (23), a second rubber wheel (27), and two second wheel frames (28); the two first wheel frames (23) are fixedly connected below the battery holder (10); the first rubber wheel (26) is rotatably connected to the first wheel frames (23); the two second wheel frames (28) are fixedly connected below the battery holder (10); and the second rubber wheel (27) is rotatably connected between the two second wheel frames (28).

5. The multifunctional digital angle ruler according to claim 1, characterized in that: The stabilizing assembly comprises a rod hook (36), a first bevel gear (29) and a second bevel gear (24); the first bevel gear (29) is rotatably connected in the battery holder (10); the rod hook (36) is fixedly connected at the center of the first bevel gear (29); and the second bevel gear (24) is rotatably connected to the first wheel frame (23).

6. A multifunctional digital angle ruler according to claim 3, characterized in that: A positive contact sheet (20) is welded on the PCB board (13); a negative contact sheet (34) is provided on one side of the positive contact sheet (20) and is welded to the PCB board (13); button batteries (12) are provided on the positive contact sheet (20) and the negative contact sheet (34); the button batteries (12) are attached to the arc surfaces of the first rubber wheel (26) and the second rubber wheel (27); a limiter assembly is provided on one side of the button battery (12); the limiter assembly is used to limit the positive contact sheet (20) when the button battery (12) is removed or installed; an upper cover shell (5) is provided above the liquid crystal (6) and is installed on the outside of the PCB board (13); a glass sheet (4) is glued and connected to the upper side of the upper cover shell (5).

7. A multifunctional digital angle ruler according to claim 5, characterized in that: The first bevel gear (29) is rotatably connected in the slot (22), the first bevel gear (29) is meshingly connected with the second bevel gear (24), a rotating shaft (25) is fixedly connected at the center of the second bevel gear (24), and an end of the rotating shaft (25) away from the second bevel gear (24) is fixedly connected to the first rubber wheel (26).

8. The multifunctional digital angle ruler according to claim 6, characterized in that: The limit assembly comprises a draw hook (21), a limit block (30), a spring block (31) and a first spring (33); the draw hook (21) is fixedly connected to the positive contact sheet (20); the limit block (30) is fixedly connected to the draw hook (21); the first spring (33) is fixedly connected to the PCB board (13); and one end of the first spring (33) away from the PCB board (13) is fixedly connected to the spring block (31).

9. A multifunctional digital angle ruler according to claim 8, characterized in that: A spring seat (32) is provided on the outside of the first spring (33) and is fixedly connected to the PCB board (13); a pressing block (35) is fixedly connected to the outside of the spring block (31); a second spring (37) is fixedly connected below the pressing block (35); one end of the second spring (37) away from the pressing block (35) is fixedly connected to the PCB board (13); and the pressing block (35) and the spring block (31) are slidably connected to the spring seat (32).

10. The multifunctional digital angle ruler according to claim 1, characterized in that: The surfaces of the upper ruler blank (1) and the lower ruler blank (2) are both provided with scales, and the lower cover shell (14), the PCB board (13) and the upper cover shell (5) are all provided with screw holes (40), and the three groups of screw holes (40) are located in corresponding upper and lower positions.

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