Engineering drawing demonstration system based on laser projection and teaching method

Abstract

The invention relates to the related technical field of drawing demonstration systems, in particular to an engineering drawing demonstration system based on laser projection and a teaching method.The engineering drawing demonstration system comprises a projector, a wireless receiver, a laser pen, a projection curtain, a camera and a computer host; the projector comprises a projector shell, a signal processing module, an image generation module, a cursor positioning module and a projection lens, the signal processing module, the image generation module and the cursor positioning module are all arranged in the projector shell, and the wireless receiver is arranged on the rear side of the projector shell; by means of the laser pen, a speaker can use the laser pen to rapidly and accurately achieve all operations, including accurate cursor arrow movement, of a common mouse, and a demonstrator can conveniently and visually conduct wireless control processing at any corner of a demonstration site through the laser pen and conduct various operations on demonstration content. Therefore, the convenience of engineering drawing demonstration teaching is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to drawing demonstration systems, and in particular to an engineering drawing demonstration system and a teaching method based on laser projection. Background Art

[0002] Engineering drawing is an important process in engineering technology. It is an important basic compulsory course in advanced engineering courses. This course is a subject that studies the drawing and reading of engineering drawings. It studies the use of projection method (see descriptive geometry) to solve spatial geometry problems and express spatial objects on a plane; In the process of teaching engineering drawing, it is necessary to use projection equipment for demonstration teaching. However, traditional projection equipment is not convenient for teaching personnel to carry out all-round demonstration teaching at any location, which leads to certain usage defects of traditional laser projection demonstration equipment in actual use. Therefore, the present invention proposes an engineering drawing demonstration system based on laser projection and a teaching method to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide an engineering drawing demonstration system and teaching method based on laser projection to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an engineering drawing demonstration system based on laser projection, comprising: A projector, comprising a projector housing, a signal processing module, an image generating module, a cursor positioning module and a projection lens, wherein the signal processing module, the image generating module and the cursor positioning module are all arranged in the projector housing; A wireless receiver, which is arranged at the rear side of the projector housing and is electrically connected to the signal processing module; A laser pen, wherein the laser pen is connected to a wireless receiver by wireless signals; A projection screen, which is used to display the image projected by the projection lens; A camera, wherein the camera is connected to a wireless receiver by wireless signals; A computer host is connected to a wireless receiver via a wireless signal.

[0005] Preferably, the signal processing module, image generation module, cursor positioning module and projection lens are connected by electrical signals, the camera is used to photograph and identify the physical demonstration items and project them through a projector, and the computer host is used to project computer data through a projector.

[0006] Preferably, the projection lens includes a lens housing and a lens, the lens is installed in the inner cavity of the lens housing, an annular seat is integrally formed at the inner port of the lens housing, a mounting hole is provided on the annular seat, and the annular seat is positioned on the front end face of the projector housing by fasteners.

[0007] Preferably, a primary air cavity is provided on the annular seat, a secondary air cavity is provided on the side wall of the lens housing, the primary air cavity and the secondary air cavity are not connected, the mounting hole is connected to the primary air cavity, aeration holes are provided on the inner side wall of the secondary air cavity, the aeration holes are distributed in the outer direction of the lens, and a plurality of aeration holes are evenly arranged.

[0008] Preferably, a primary pipeline connection port is provided on the side wall of the primary air cavity, and a primary air pipe is connected to the primary pipeline connection port; a secondary pipeline connection port is provided on the side wall of the secondary air cavity, and a secondary air pipe is connected to the secondary pipeline connection port; a small air pump is provided in the inner cavity of the projector housing, an air inlet port of the small air pump is connected to the primary air pipe, and an exhaust port of the small air pump is connected to the secondary air pipe.

[0009] Preferably, the fastener includes a fastening bolt and a dust cover, the fastening bolt is a hexagon socket bolt, the screw rod of the fastening bolt is not threaded on the side facing the nut, and a main air duct is provided on the screw rod, the cross-sectional size of the main air duct is smaller than the size of the wrench slot on the nut, and a filter hole is provided on the side wall of the main air duct.

[0010] Preferably, the main air channel does not penetrate the screw rod, and the filter holes are arranged through the screw rod. When the fastening bolt is actually tightened, the distribution position of the filter holes corresponds to the primary air cavity, and the port of the aeration hole is arranged to be inclined toward the outer surface of the lens.

[0011] Preferably, the dust cover is arranged in a trumpet shape, and a screw hole is opened at the bottom of the dust cover, the cross-sectional size of the screw hole matches the screw size of the fastening bolt, and a dust shield ring is integrally formed on the inner wall of the dust cover, the dust shield ring is arranged in a trumpet shape, and the small port of the dust shield ring is arranged toward the outer end of the dust cover, and the dust shield ring is arranged in multiple layers at equal intervals.

[0012] Preferably, the lens housing is horn-shaped as a whole, and an annular groove is provided on the side wall of the lens housing, and a primary step opening and a secondary step opening are respectively formed on both sides of the annular groove. When the lens is actually installed, the lens is engaged in the annular groove, and the depth of the primary step opening is greater than five millimeters, and the depth of the secondary step opening is less than one millimeter.

[0013] A method for teaching engineering drawing demonstration based on laser projection, which is implemented by the above-mentioned engineering drawing demonstration system based on laser projection. The method comprises the following steps: transmitting the signal to be projected to a wireless receiver through a camera and a computer host, and then transmitting the signal to a signal processing module for processing through the wireless receiver. The processed signal is then generated by an image generation module and positioned by a cursor positioning module, and then projected onto a projection screen for display through a projection lens, and then remotely controlled by a laser pen.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a laser projection-based engineering drawing demonstration system composed of a projector, a wireless receiver, a laser pen, a projection screen, a camera and a computer host, the speaker can use the laser pen to quickly and accurately perform all the operations of an ordinary mouse, including precise cursor arrow movement, so that the presenter can conveniently and intuitively perform wireless control processing with the laser pen in any corner of the demonstration site, and perform various operations on the demonstration content, thereby effectively improving the convenience of engineering drawing demonstration teaching; 2. The projection lens is configured to be composed of a lens housing and a lens, an annular seat is integrally formed on the lens housing, a primary air cavity is provided on the annular seat, a secondary air cavity is provided on the lens housing, and an aeration hole is provided on the inner wall of the secondary air cavity, so that a small air pump can be operated to allow a stable airflow to be ejected from the aeration hole, thereby forming a wind wall on the outside of the lens, thereby effectively blocking dust from adhering to the lens, thereby preventing dust from adhering to the lens and affecting the projection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the projector of the present invention; Figure 3 A half-section view of the projection lens of the present invention; Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle; Figure 6 for Figure 5 A magnified schematic diagram of the structure at C in the middle; Figure 7 A half-section view of the lens housing of the present invention; Figure 8 for Figure 7 A magnified schematic diagram of the structure at D in the middle; Fig. 9This is a schematic diagram of the fastening bolt structure of the present invention; Fig.10 It is a half-section view of the dust cover of the present invention.

[0016] In the figure: projector housing 1, projection lens 2, fastener 3, lens housing 4, lens 5, annular seat 6, mounting hole 7, fastening bolt 8, primary air cavity 9, secondary air cavity 10, primary pipe connection port 11, secondary pipe connection port 12, aeration hole 13, main air duct 14, filter hole 15, dust cover 16, screw hole 17, dust shield ring 18, annular groove 19, primary step opening 21, secondary step opening 22. DETAILED DESCRIPTION

[0017] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 10 The present invention provides the following three preferred embodiments: Embodiment 1, an engineering drawing demonstration system based on laser projection, includes a projector, a wireless receiver, a laser pen, a projection screen, a camera and a computer host, the projector includes a projector housing 1, a signal processing module, an image generating module, a cursor positioning module and a projection lens 2, the signal processing module, the image generating module and the cursor positioning module are all arranged in the projector housing 1, the wireless receiver is arranged on the rear side of the projector housing 1, and the wireless receiver is electrically connected to the signal processing module, the laser pen is wirelessly connected to the wireless receiver, the projection screen is used to display the picture projected by the projection lens 2, the camera is wirelessly connected to the wireless receiver, and the computer host is wirelessly connected to the wireless receiver.

[0019] The signal processing module, the image generation module, the cursor positioning module, and the projection lens 2 are connected by electrical signals. The camera is used to photograph and identify the physical demonstration items and project them through the projector. The computer host is used to project and display the computer data through the projector. By setting up an engineering drawing demonstration system based on laser projection composed of a projector, a wireless receiver, a laser pen, a projection screen, a camera and a computer host, the speaker can use the laser pen to quickly and accurately perform all operations of an ordinary mouse, including precise cursor arrow movement, so that the demonstrator can use the laser pen to conveniently and intuitively perform wireless control processing in any corner of the demonstration site, and perform various operations on the demonstration content, thereby effectively improving the convenience of engineering drawing demonstration teaching.

[0020] Embodiment 2, on the basis of embodiment 1, the projection lens 2 includes a lens housing 4 and a lens 5, the lens 5 is installed in the inner cavity of the lens housing 4, an annular seat 6 is integrally formed at the inner port of the lens housing 4, a mounting hole 7 is opened on the annular seat 6, and the annular seat 6 is positioned on the front end face of the projector housing 1 by a fastener 3.

[0021] A primary air cavity 9 is provided on the annular seat 6, and a secondary air cavity 10 is provided on the side wall of the lens housing 4. The primary air cavity 9 and the secondary air cavity 10 are not connected, and the mounting hole 7 is connected to the primary air cavity 9. Aeration holes 13 are provided on the inner side wall of the secondary air cavity 10. The distribution position of the aeration holes 13 is located on the outer side of the lens 5, and the aeration holes 13 are evenly arranged in multiple groups.

[0022] A primary pipe connection port 11 is provided on the side wall of the primary air cavity 9, and a primary air pipe is connected to the primary pipe connection port 11. A secondary pipe connection port 12 is provided on the side wall of the secondary air cavity 10, and a secondary air pipe is connected to the secondary pipe. A small air pump is provided in the inner cavity of the projector housing 1, and an air inlet port of the small air pump is connected to the primary air pipe, and an exhaust port of the small air pump is connected to the secondary air pipe. By configuring the projection lens 2 to be composed of a lens housing 4 and a lens 5, and an annular seat 6 is integrally formed on the lens housing 4, a primary air cavity 9 is opened on the annular seat 6, a secondary air cavity 10 is opened on the lens housing 4, and an aeration hole 13 is opened on the inner side wall of the secondary air cavity 10, the operation of the small air pump allows the airflow to be stably ejected from the aeration hole 13, so that a wind wall is formed on the outside of the lens 5, thereby effectively blocking dust from adhering to the lens 5, thereby avoiding dust adhesion and affecting the projection effect.

[0023] The fastener 3 includes a fastening bolt 8 and a dust cover 16. The fastening bolt 8 is a hexagon socket bolt. The screw rod of the fastening bolt 8 is not threaded on the side of the nut, and a main air duct 14 is provided on the screw rod. The cross-sectional size of the main air duct 14 is smaller than the size of the wrench groove on the nut, and a filter hole 15 is provided on the side wall of the main air duct 14. By providing the main air duct 14 and the filter hole 15 on the screw rod of the fastening bolt 8, the fastening bolt 8 can not only play the role of positioning and fixing, but also filter the incoming air, thereby effectively preventing the air from containing dust and affecting the dust-proof effect of the aeration hole 13.

[0024] The main air channel 14 does not penetrate the screw rod, and the filter hole 15 is set through the screw rod. When the fastening bolt 8 is actually tightened, the distribution position of the filter hole 15 corresponds to the primary air cavity 9, and the port of the aeration hole 13 is set inclined toward the outer surface of the lens 5.

[0025] The dust cover 16 is arranged in a trumpet shape, and a screw hole 17 is provided at the bottom of the dust cover 16. The cross-sectional size of the screw hole 17 matches the screw size of the fastening bolt 8. A dust shield ring 18 is integrally formed on the inner wall of the dust cover 16. The dust shield ring 18 is arranged in a trumpet shape, and the small port of the dust shield ring 18 is arranged toward the outer end of the dust cover 16. The dust shield ring 18 is arranged in multiple layers at equal intervals, and auxiliary filtering is performed through the dust cover 16, thereby further improving the dustproof effect.

[0026] The lens housing 4 is horn-shaped as a whole, and an annular groove 19 is provided on the side wall of the lens housing 4. A primary step opening 21 and a secondary step opening 22 are respectively formed on both sides of the annular groove 19. When the lens 5 is actually installed, the lens 5 is engaged in the annular groove 19, and the depth of the primary step opening 21 is greater than five millimeters, and the depth of the secondary step opening 22 is less than one millimeter, which is convenient for positioning and fixing the lens 5.

[0027] Embodiment 3, on the basis of embodiment 2, a method for teaching engineering drawing demonstration based on laser projection is provided. The method for teaching engineering drawing demonstration based on laser projection is implemented by the above-mentioned engineering drawing demonstration system based on laser projection. The method transmits the signal to be projected to the wireless receiver through the camera and the computer host, and then transmits the signal to the signal processing module for processing through the wireless receiver. The processed signal is then generated by the image generation module and positioned by the cursor positioning module, and then projected onto the projection screen through the projection lens 2 for display, and then remotely controlled by the laser pen.

[0028] In actual use, the small air pump is operated to allow air to enter the main air duct 14 through the dust cover 16, then pass through the filtering effect of the filter hole 15, then enter the primary air cavity 9, then enter the secondary air cavity 10, and finally be sent out through the aeration hole 13 to form a wind wall, thereby forming a protective effect to prevent dust from adhering to the outer side of the lens 5.

[0029] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. An engineering drawing demonstration system based on laser projection, characterized in that: include: A projector, comprising a projector housing (1), a signal processing module, an image generating module, a cursor positioning module and a projection lens (2), wherein the signal processing module, the image generating module and the cursor positioning module are all arranged in the projector housing (1); A wireless receiver, the wireless receiver being arranged on the rear side of the projector housing (1), and the wireless receiver being electrically connected to the signal processing module; A laser pen, wherein the laser pen is connected to a wireless receiver by wireless signals; A projection screen, the projection screen being used to display the image projected by the projection lens (2); A camera, wherein the camera is connected to a wireless receiver by wireless signals; A computer host is connected to a wireless receiver via a wireless signal.

2. The engineering drawing demonstration system based on laser projection according to claim 1, characterized in that: The signal processing module, the image generation module, the cursor positioning module and the projection lens (2) are connected by electrical signals; the camera is used to perform video recognition of physical demonstration items and project them through a projector; and the computer host is used to project computer data through a projector.

3. The engineering drawing demonstration system based on laser projection according to claim 1, characterized in that: The projection lens (2) comprises a lens housing (4) and a lens (5); the lens (5) is mounted in an inner cavity of the lens housing (4); an annular seat (6) is integrally formed at an inner port of the lens housing (4); a mounting hole (7) is provided on the annular seat (6); and the annular seat (6) is positioned on a front end surface of the projector housing (1) via a fastener (3).

4. The engineering drawing demonstration system based on laser projection according to claim 3, characterized in that: The annular seat (6) is provided with a primary air cavity (9), and the side wall of the lens housing (4) is provided with a secondary air cavity (10). The primary air cavity (9) and the secondary air cavity (10) are not connected to each other. The mounting hole (7) is connected to the primary air cavity (9). Aeration holes (13) are provided on the inner side wall of the secondary air cavity (10). The aeration holes (13) are distributed in the outer direction of the lens (5), and a plurality of groups of aeration holes (13) are evenly distributed.

5. The engineering drawing demonstration system based on laser projection according to claim 4, characterized in that: A primary pipeline connection port (11) is provided on the side wall of the primary air cavity (9), and a primary air pipe is connected to the primary pipeline connection port (11); a secondary pipeline connection port (12) is provided on the side wall of the secondary air cavity (10), and a secondary air pipe is connected to the secondary air pipe; a small air pump is provided in the inner cavity of the projector housing (1), an air inlet port of the small air pump is connected to the primary air pipe, and an air outlet port of the small air pump is connected to the secondary air pipe.

6. The engineering drawing demonstration system based on laser projection according to claim 6, characterized in that: The fastener (3) comprises a fastening bolt (8) and a dust cover (16); the fastening bolt (8) is a hexagon socket bolt; a screw rod of the fastening bolt (8) is not threaded on a side close to the nut; a main air passage (14) is provided on the screw rod; the cross-sectional dimension of the main air passage (14) is smaller than the dimension of the wrench slot on the nut; and a filter hole (15) is provided on a side wall of the main air passage (14).

7. The engineering drawing demonstration system based on laser projection according to claim 6, characterized in that: The main air channel (14) does not penetrate the screw rod, and the filter holes (15) are arranged to penetrate the screw rod; when the fastening bolt (8) is actually tightened, the distribution position of the filter holes (15) corresponds to the primary air cavity (9), and the port of the aeration hole (13) is arranged to be inclined toward the outer surface of the lens (5).

8. The engineering drawing demonstration system based on laser projection according to claim 7, characterized in that: The dust cover (16) is arranged in a trumpet shape, and a screw hole (17) is provided at the bottom of the dust cover (16). The cross-sectional size of the screw hole (17) matches the screw size of the fastening bolt (8). A dust shield ring (18) is integrally formed on the inner wall of the dust cover (16). The dust shield ring (18) is arranged in a trumpet shape, and a small end of the dust shield ring (18) is arranged toward the outer end of the dust cover (16). The dust shield ring (18) is arranged in multiple layers at equal intervals.

9. The engineering drawing demonstration system based on laser projection according to claim 8, characterized in that: The lens housing (4) is shaped as a trumpet as a whole, and a ring-shaped groove (19) is formed on the side wall of the lens housing (4), and a primary step opening (21) and a secondary step opening (22) are respectively formed on both sides of the ring-shaped groove (19). When the lens (5) is actually installed, the lens (5) is engaged in the ring-shaped groove (19), and the depth of the primary step opening (21) is greater than five millimeters, and the depth of the secondary step opening (22) is less than one millimeter.

10. A laser projection-based engineering drawing demonstration teaching method, characterized in that: The engineering drawing demonstration teaching method based on laser projection is implemented by any one of the engineering drawing demonstration systems based on laser projection according to claims 1 to 9. The method comprises transmitting the signal to be projected to a wireless receiver through a camera and a computer host, and then transmitting the signal to a signal processing module for processing through the wireless receiver. The processed signal is then generated by an image generation module and positioned by a cursor positioning module, and then projected onto a projection screen for display through a projection lens (2), and then remotely controlled by a laser pen.

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