CN118522187B - Projection equipment that manpower resource management teaching was used - Google Patents

Abstract

The invention relates to the field of teaching demonstration technology, and discloses a projection device for teaching human resource management, including a projector, which is composed of a main body and a projection lens group, a cleaning component is arranged at the front of the projection lens group, a driving component connected to the cleaning component is arranged above the cleaning component, a reflux component and a flow supply component are sequentially installed at the bottom of the projector from front to back, a heat exchange tube is wound on the main body, wherein the reflux component is connected to the cleaning component, and the flow supply component is connected to the driving component through the heat exchange tube; the present invention aggregates cleaning plates circumferentially distributed on the inner side wall of the outer ring gear from outside to inside until the cleaning plates are combined into a cross-shaped cleaning frame, and a closed cleaning chamber is formed in the inner ring frame and the outer ring gear, and the water after heat exchange flows to the vortex impeller through a high-pressure head, causing the vortex impeller and the driving tube to rotate, and the rotating driving tube drives the outer ring gear meshing with it, and the lens surface is self-cleaned and cleaned with the rotation of the cleaning plate.

Description

A projection device for teaching human resource management

Technical Field

The present invention relates to the technical field of teaching demonstration, and more specifically to a projection device for teaching human resource management.

Background Art

Multimedia teaching is a modern teaching method. It emphasizes that in the teaching process, according to specific teaching objectives and students' characteristics, through careful teaching design, the rational selection and use of various modern teaching media, including computers, projectors, slide projectors, display stands, video equipment, etc. In the teaching field of human resource management, the application of multimedia teaching is particularly extensive.

For example, a Chinese patent with announcement number CN206259037U discloses a multimedia teaching projection device for teaching human resource management, including a box body, limit plates are arranged on the left and right sides of the bottom of the inner cavity of the box body, the projection device is arranged on the top of the limit plates, and the left and right side walls of the inner cavity of the box body are arranged with blocks. When the projection device is not in use, the rotation of the driving motor is controlled by the control device to drive the rotation of the rotating shaft, and the rotation of the rotating shaft drives the lowering of the blocking cloth. The lowering of the blocking cloth seals the box body, reduces dust from entering the box body, prevents dust from entering the projection device, and ensures the normal use of the projection device.

The projection lens group of the projection equipment must be exposed to the external environment during normal use, which makes it very easy to accumulate dust. When dust accumulates on the surface of the lens group, it will directly affect its light transmission performance, because the dust particles will scatter or absorb the light passing through, thereby reducing the clarity and brightness of the image and damaging the final projection effect. In addition to maintaining the cleanliness of the lens group, the projection equipment generates high temperature when running for a long time. High temperature will not only affect the stability and life of the equipment, but also may cause the image quality to deteriorate. Therefore, how to effectively cool the projection equipment and recycle the heat energy generated by the equipment has become a key issue in improving overall energy efficiency.

Therefore, there is an urgent need for a new projection device for teaching human resource management, which can prevent dust from adhering and ensure light transmission without affecting the function of the projection lens group; and recycle the heat energy generated by the equipment to improve the energy efficiency of the projection equipment.

Summary of the invention

In order to overcome the above-mentioned defects of the prior art, the present invention provides a projection device for teaching human resource management, so as to solve the problems existing in the above-mentioned background technology, namely, how to realize self-cleaning maintenance of the projection lens group, prevent dust adhesion, ensure light transmission performance, and how to recycle the heat energy generated by the equipment to improve the energy efficiency of the projection equipment.

The present invention provides the following technical solution: a projection device for teaching human resource management, comprising a projector, the projector comprising a main body and a projection lens group, the projection lens group comprising a lens and a lens frame, wherein the lens is detachably mounted in the lens frame, the lens frame is threadedly mounted on the projection end of the front part of the main body, a cleaning component is arranged at the front part of the projection lens group, a driving component connected to the cleaning component is arranged above the cleaning component, a reflux component and a flow supply component are arranged in sequence from front to back at the bottom of the projector, a heat exchange pipe is wound around the main body, wherein the reflux component is connected to the cleaning component, the flow supply component is connected to the driving component via the heat exchange pipe, the driving component is fixedly arranged above the main body through a mounting seat, and the mounting seat is used to be installed on the indoor roof;

The cleaning assembly includes a main cover body, an inner ring frame, an outer ring gear, a connecting rod, a cleaning plate and an electromagnet, wherein the main cover body is fixedly mounted on the frame, an inner ring frame is coaxially arranged in the main cover body, and the inner ring frame is movably clamped on the front side wall of the frame, the inner ring frame is fixedly connected to the middle part of the outer ring gear through a connecting rod, the front side of the outer ring gear is connected to the through opening of the main cover body, a circumferentially distributed cleaning plate is arranged in the outer ring gear, a sliding groove for moving the cleaning plate inwards and outwards is arranged on the inner wall of the rear side of the outer ring gear, an electromagnet is fixedly connected to the side wall of the cleaning plate, when the two sets of electromagnets arranged opposite to each other are transformed from magnetic repulsion to magnetic attraction, the cleaning plates circumferentially distributed on the inner side wall of the outer ring gear are aggregated from the outside to the inside until the cleaning plates are merged into a cross-shaped cleaning frame, and the cross-shaped cleaning frame is attached to the surface of the lens.

Furthermore, the driving assembly includes an auxiliary cover body, a driving pipe, a high-pressure head, a vortex impeller and a guide pipe, wherein the auxiliary cover body is fixedly connected to the top of the main cover body, the auxiliary cover body is communicated with the main cover body, the driving pipe is movably arranged in the auxiliary cover body, the vortex impeller is fixedly installed in the driving pipe, the driving pipe is movably clamped on the front side wall of the high-pressure head, and the high-pressure head is fixedly arranged on the top of the main body through a mounting seat. The water after heat exchange flows through the high-pressure head to the vortex impeller, causing the vortex impeller and the driving pipe to rotate, and the rotating driving pipe drives the outer ring teeth meshing therewith, causing the inner ring frame, the outer ring teeth, the connecting rod, the cleaning plate and the electromagnet to rotate together along the inner cavity of the main cover body.

Furthermore, a closing component is provided at the bottom of the main cover body, and the closing component includes a blocking piece, a shaft disk and a servo motor, wherein the blocking piece is movably arranged in the front wall of the main cover body, and the servo motor is installed on the front outer wall of the main cover body. The output shaft of the servo motor is fixedly connected to the blocking piece through the shaft disk, and the blocking piece can be turned and sealed at the front end of the opening of the main cover body, so that a closed cleaning chamber is formed in the inner ring frame and the outer ring teeth.

Furthermore, the inner cavity of the driving tube is connected to the cleaning cavity formed by the inner ring frame and the outer ring gear through the guide tube.

Furthermore, an opening is provided on the outer edge of the inner ring frame for the cleaning plate and the electromagnet to pass through, and a cavity is provided in the front wall of the main cover body for the sweeping motion of the blocking plate.

Furthermore, the flow supply component includes a flow supply tee, a liquid pump, a first solenoid valve, an air pump and a second solenoid valve, wherein the single head at the top of the flow supply tee is connected to the heat exchange tube, a branch at the bottom of the flow supply tee is connected to the first solenoid valve and the liquid pump, and another branch at the bottom of the flow supply tee is connected to the second solenoid valve and the air pump. The flow supply tee, liquid pump, first solenoid valve and air pump are covered by the second solenoid valve, and the second solenoid valve is fixedly mounted on the bottom wall of the main body.

Furthermore, the reflux component includes a water tank, a filter element, a reflux tee, a third solenoid valve and a fourth solenoid valve, wherein the water tank is fixedly mounted on the bottom wall of the projector, a filter element is arranged in the inner cavity of the water tank, the filter element divides the inner cavity of the water tank into two parts, namely a sedimentation chamber and a clean water chamber, the single head at the top of the reflux tee is connected to the inner cavity of the main cover body, a branch at the bottom of the reflux tee is connected to the sedimentation chamber of the water tank, a third solenoid valve is installed on this branch, and another branch at the bottom of the reflux tee points to the outside, a fourth solenoid valve is installed on this branch.

Technical effects and advantages of the present invention:

The present invention is provided with a cleaning component, a driving component and a flow supply component, which is conducive to the conversion of magnetic repulsion into magnetic attraction of two groups of electromagnets arranged opposite to each other, so that the cleaning plates circumferentially distributed on the inner wall of the outer ring teeth converge from the outside to the inside until the cleaning plates are combined into a cross-shaped cleaning frame, and at the same time, the blocking plate is turned and sealed at the front end of the opening of the main cover body, so that a closed cleaning chamber is formed in the inner ring frame and the outer ring teeth, and the water pumped out by the liquid pump is introduced into the heat exchange tube through the first solenoid valve and the flow supply tee, and the water after heat exchange flows to the vortex impeller through the high-pressure head, so that the vortex impeller and the driving tube rotate, and the rotating driving tube drives the outer ring teeth meshed with it, so that the inner ring frame, the outer ring teeth, the connecting rod, the cleaning plate and the electromagnet rotate together along the inner cavity of the main cover body; at the same time, the water entering the driving tube is introduced into the cleaning cavity through the guide tube, and the lens surface is self-cleaned and cleaned with the rotation of the cleaning plate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a schematic diagram of the overall structure of the present invention and its partial cross-section.

FIG3 is a schematic diagram of the connection structure of the cleaning component and the driving component and the sealing component and the reflux component of the present invention.

FIG. 4 is a schematic diagram of the connection structure of the cleaning component, the projector and the sealing component of the present invention.

FIG. 5 is a schematic diagram of the structure of point A in FIG. 4 of the present invention.

FIG. 6 is a schematic diagram of the cleaning component structure of the present invention.

The accompanying drawings are marked as follows: 1. projector; 101. main body; 102. lens; 103. lens frame; 2. cleaning assembly; 201. main cover; 202. inner ring frame; 203. outer ring gear; 204. connecting rod; 205. cleaning plate; 206. electromagnet; 3. driving assembly; 301. auxiliary cover; 302. driving pipe; 303. high pressure head; 304. vortex impeller; 305. guide pipe; 4. Closing assembly; 401, blocking piece; 402, shaft disc; 403, servo motor; 5, flow supply assembly; 501, flow supply tee; 502, liquid pump; 503, first solenoid valve; 504, air pump; 505, second solenoid valve; 6, reflux assembly; 601, water tank; 602, filter element; 603, reflux tee; 604, third solenoid valve; 605, fourth solenoid valve; 7, heat exchange tube; 8, mounting seat.

DETAILED DESCRIPTION

The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The projection device for human resource management teaching involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

1-6, the present invention provides a projection device for teaching human resource management, including a projector 1, wherein the projector 1 is composed of a main body 101 and a projection lens group, wherein a cleaning component 2 is arranged in front of the projection lens group, and a driving component 3 connected to the cleaning component 2 is arranged above the cleaning component 2, and a reflux component 6 and a flow supply component 5 are sequentially installed at the bottom of the projector 1 from front to back, and a heat exchange tube 7 is wound around the body of the main body 101, wherein the reflux component 6 is connected to the cleaning component 2, and the flow supply component 5 is connected to the driving component 3 via the heat exchange tube 7, and the driving component 3 is fixedly arranged above the main body 101 through a mounting seat 8, and the mounting seat 8 is used to be installed on the indoor roof.

In this embodiment, it should be specifically explained that the projection lens assembly includes a lens 102 and a lens frame 103 , wherein the lens 102 is detachably installed in the lens frame 103 , and the lens frame 103 is threadedly installed at the projection end of the front part of the main body 101 .

2-6, the cleaning assembly 2 includes a main cover body 201, an inner ring frame 202, an outer ring gear 203, a connecting rod 204, a cleaning plate 205 and an electromagnet 206, wherein the main cover body 201 is fixedly mounted on the lens frame 103, an inner ring frame 202 is coaxially arranged inside the main cover body 201, and the inner ring frame 202 is movably connected to the front side wall of the lens frame 103, the inner ring frame 202 is fixedly connected to the middle part of the outer ring gear 203 by the connecting rod 204, and the front side of the outer ring gear 203 is connected to the opening of the main cover body 201. The outer ring gear 203 is connected, and a cleaning plate 205 distributed in a circle is arranged inside the outer ring gear 203. A slide groove for the cleaning plate 205 to move in and out is arranged on the inner wall of the rear side of the outer ring gear 203. An electromagnet 206 is fixedly connected to the side wall of the cleaning plate 205. When the two sets of electromagnets 206 arranged opposite to each other are transformed from magnetic repulsion to magnetic attraction, the cleaning plates 205 distributed in a circle on the inner wall of the outer ring gear 203 are aggregated from outside to inside until the cleaning plates 205 are combined into a cross-shaped cleaning frame, and the cross-shaped cleaning frame is attached to the surface of the lens 102.

The driving assembly 3 comprises an auxiliary cover body 301, a driving pipe 302, a high pressure head 303, a vortex impeller 304 and a guide pipe 305, wherein the auxiliary cover body 301 is fixedly connected to the top of the main cover body 201, the auxiliary cover body 301 is communicated with the main cover body 201, the driving pipe 302 is movably arranged in the auxiliary cover body 301, the vortex impeller 304 is fixedly arranged in the driving pipe 302, the driving pipe 302 is movably clamped on the front side wall of the high pressure head 303, the high pressure head 303 is fixedly arranged on the top of the main body 101 through the mounting seat 8, the water after heat exchange flows through the high pressure head 303 to the vortex impeller 304, causing the vortex impeller 304 and the driving pipe 302 to rotate, the rotating driving pipe 302 drives the outer ring gear 203 meshing therewith, causing the inner ring frame 202, the outer ring gear 203, the connecting rod 204, the cleaning plate 205 and the electromagnet 206 to spin together along the inner cavity of the main cover body 201;

The bottom of the main cover 201 is provided with a closing component 4, which includes a blocking piece 401, a shaft disc 402 and a servo motor 403, wherein the blocking piece 401 is movably arranged in the front wall of the main cover 201, the servo motor 403 is installed on the front outer wall of the main cover 201, and the output shaft of the servo motor 403 is fixedly connected with the blocking piece 401 through the shaft disc 402, and the blocking piece 401 can be turned and sealed at the front end of the through-port of the main cover 201, so that a closed cleaning chamber is formed in the inner ring frame 202 and the outer ring gear 203;

The inner cavity of the driving tube 302 is connected to the cleaning cavity formed by the inner ring frame 202 and the outer ring gear 203 through the guide tube 305 .

In this embodiment, it should be specifically explained that the outer edge of the inner ring frame 202 is provided with an opening for the cleaning plate 205 and the electromagnet 206 to pass through;

A cavity is defined in the front wall of the main cover 201 for the blocking sheet 401 to sweep.

2-3, the flow supply assembly 5 includes a flow supply tee 501, a liquid pump 502, a first solenoid valve 503, an air pump 504 and a second solenoid valve 505, wherein the single head at the top of the flow supply tee 501 is connected to the heat exchange tube 7, a branch at the bottom of the flow supply tee 501 is connected to the first solenoid valve 503 and the liquid pump 502, and another branch at the bottom of the flow supply tee 501 is connected to the second solenoid valve 505 and the air pump 504, the flow supply tee 501, the liquid pump 502, the first solenoid valve 503 and the air pump 504 are covered inside by the second solenoid valve 505, and the second solenoid valve 505 is fixedly installed on the bottom wall of the main body 101;

The reflux component 6 includes a water tank 601, a filter element 602, a reflux tee 603, a third solenoid valve 604 and a fourth solenoid valve 605, wherein the water tank 601 is fixedly installed on the bottom wall of the projector 1, and a filter element 602 is arranged in the inner cavity of the water tank 601. The filter element 602 divides the inner cavity of the water tank 601 into two parts, a sedimentation chamber and a clean water chamber, respectively. The single head at the top of the reflux tee 603 is connected to the inner cavity of the main cover body 201, and a branch at the bottom of the reflux tee 603 is connected to the sedimentation chamber of the water tank 601. The third solenoid valve 604 is installed on this branch. The other branch at the bottom of the reflux tee 603 points to the outside, and the fourth solenoid valve 605 is installed on this branch.

Working principle of the present invention:

S1, blocking stage: when the amount of dust attached to the surface of the projection lens group affects the projection image quality, the two oppositely arranged electromagnets 206 are controlled to change from magnetic repulsion to magnetic attraction, so that the two oppositely arranged electromagnets 206 respectively pull the cleaning plates 205 connected thereto to move toward each other, causing the cleaning plates 205 circumferentially distributed on the inner side wall of the outer ring gear 203 to converge from the outside to the inside along the slide groove of the inner wall of the outer ring gear 203, until the circumferentially distributed cleaning plates 205 are combined into a cross-shaped cleaning frame, and the cross-shaped cleaning frame is attached to the surface of the lens 102; at the same time, the output shaft of the servo motor 403 is controlled to drive the shaft disc 402 and the servo motor 403 connected thereto to rotate 180 degrees, so that the blocking plate 401 is turned around and sealed at the front end of the opening of the main cover body 201, so that a closed cleaning chamber is formed in the inner ring frame 202 and the outer ring gear 203, waiting for water to be injected into the cleaning chamber;

S2, water injection cleaning stage: when the cleaning plates 205 are aggregated to form a cross-shaped cleaning frame and the blocking plate 401 blocks the opening of the main cover body 201, the liquid pump 502 is controlled to extract water from the clean water chamber of the water tank 601, and the water pumped out by the liquid pump 502 is introduced into the heat exchange tube 7 through the first electromagnetic valve 503 that is opened and the flow supply tee 501 connected thereto. The cooling water flowing through the heat exchange tube 7 exchanges heat with the main body 101 and then flows to the vortex impeller 304 through the high pressure head 303. The high pressure water flow that continuously flows through the vortex impeller 304 causes the vortex impeller 304 to rotate, causing the vortex impeller 304 to rotate along the front side of the high pressure head 303 by means of the driving pipe 302 connected thereto. The rotating driving pipe 302 transmits the energy to the vortex impeller 304. The meshing outer ring gear 203, because the inner ring frame 202 is movably connected to the front side wall of the lens frame 103, causes the inner ring frame 202, the outer ring gear 203, the connecting rod 204, the cleaning plate 205 and the electromagnet 206 to rotate together along the inner cavity of the main cover body 201; at the same time, the water flow entering the driving tube 302 is introduced into the cleaning cavity through the guide tube 305, and the surface of the lens 102 is self-cleaned with the rotation of the cleaning plate 205. The cleaning sewage flows back to the sedimentation cavity of the water tank 601 through the reflux tee 603 connected to the bottom of the main cover body 201 and the third electromagnetic valve 604 that is opened. After the sewage collected in the sedimentation cavity is filtered by the filter element 602, the pure water part re-infiltrates into the clean water cavity for subsequent use;

S3, drying stage: after the self-cleaning cleaning of the surface of the lens 102 is completed, the control liquid pump 502 stops pumping water, and the air pump 504 is used to draw the outside air and introduce it into the heat exchange tube 7 through the second electromagnetic valve 505 and the flow supply tee 501. The cold air flow flowing through the heat exchange tube 7 exchanges heat with the main body 101 and then flows to the vortex impeller 304 through the high pressure head 303. The high pressure air flow that continues to flow through the vortex impeller 304 causes the vortex impeller 304 to rotate, causing the vortex impeller 304 and the driving tube 302 to rotate. The driving tube 302 drives the outer ring gear 203 meshing therewith, so that the inner ring frame 202, the outer ring gear 203, the connecting rod 204, the cleaning plate 205 and the electromagnet 206 rotate along the inner cavity of the main cover 201, and then the servo motor 403 is controlled to drive the blocking plate 401 to rotate and reset, so that the main cover 201 is restored to be unblocked, and finally the third electromagnetic valve 604 is controlled to close the valve, and the fourth electromagnetic valve 605 is replaced by an open valve, so that there is a circulating airflow in the cleaning cavity to dry the cleaning plate 205 and the surface of the lens 102;

S4, reset stage: after the cleaning plate 205 and the surface of the lens 102 are dried, the air pump 504 is controlled to stop supplying air to the heat exchange tube 7, so that the drive tube 302 and the outer ring gear 203 stop transmitting, and the two oppositely arranged groups of electromagnets 206 are controlled to change from magnetic attraction to magnetic repulsion, so that the two opposite groups of electromagnets 206 respectively pull the cleaning plate 205 connected thereto to move in reverse, until the cleaning plate 205 and the electromagnet 206 are reset from the main cover body 201 to the side of the outer ring gear 203, until the projection track of the lens 102 is no longer blocked, and the equipment is restored to its initial state to wait for the next cleaning operation.

The above is only a preferred specific embodiment 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 substitutions or modifications within the technical scope disclosed by the present invention; according to the technical plan and its improved conception of the present invention, all of which should be included under the protection of the present invention.

Claims (5)

1. The utility model provides a projection equipment that manpower resources management teaching was used, includes projector (1), projector (1) comprises host computer body (101) and projection lens group, and projection lens group includes lens (102) and picture frame (103), wherein lens (102) demountable installation is in picture frame (103), and picture frame (103) screw thread installation is at the anterior projection end of organism of host computer body (101), its characterized in that: the front part of the projection lens group is provided with a cleaning component (2), a driving component (3) connected with the cleaning component (2) is arranged above the cleaning component, a reflux component (6) and a flow supply component (5) are sequentially arranged at the bottom of the projector (1) from front to back, a heat exchange tube (7) is wound on a machine body of the main machine body (101), the reflux component (6) is communicated with the cleaning component (2), the flow supply component (5) is communicated with the driving component (3) through the heat exchange tube (7), the driving component (3) is fixedly arranged above the main machine body (101) through a mounting seat (8), and the mounting seat (8) is used for being mounted on an indoor roof;

The cleaning assembly (2) comprises a main cover body (201), an inner ring frame (202), outer ring teeth (203), connecting rods (204), cleaning plates (205) and electromagnets (206), wherein the main cover body (201) is fixedly arranged on a mirror frame (103), the inner ring frame (202) is coaxially arranged in the main cover body (201), the inner ring frame (202) is movably clamped on the front side wall of the mirror frame (103), the inner ring frame (202) is fixedly connected to the middle part of the outer ring teeth (203) through the connecting rods (204), the front side of the outer ring teeth (203) is connected with a through hole of the main cover body (201), circumferentially distributed cleaning plates (205) are arranged in the outer ring teeth (203), sliding grooves used for moving inside and outside the cleaning plates (205) are formed in the inner wall of the rear side of the outer ring teeth (203), the electromagnets (206) are fixedly connected to the side wall of the cleaning plates (205), when oppositely arranged two groups of electromagnets (206) are converted into magnetic repulsive force by magnetic repulsion, the circumferentially distributed on the cleaning plates (205) on the inner side walls of the outer ring teeth (203) are combined to the cleaning plates (205) from the outer ring teeth to the cross-shaped plates (205), and the cleaning plates are adhered to the surfaces of the cross-shaped cleaning plates (102);

The driving assembly (3) comprises an auxiliary cover body (301), a driving pipe (302), a high-pressure head (303), a vortex impeller (304) and a flow guide pipe (305), wherein the auxiliary cover body (301) is fixedly connected to the top of the main cover body (201), the auxiliary cover body (301) is communicated with the main cover body (201), the driving pipe (302) is movably arranged in the auxiliary cover body (301), the vortex impeller (304) is fixedly arranged in the driving pipe (302), the driving pipe (302) is movably clamped on the front side wall of the high-pressure head (303), the high-pressure head (303) is fixedly arranged at the top of the main body (101) through a mounting seat (8), water after heat exchange flows into the vortex impeller (304) through Gao Yatou (303), the vortex impeller (304) and the driving pipe (302) rotate, the rotating driving pipe (302) drives an outer ring gear (203) meshed with the vortex impeller, and the inner ring gear (202), the outer ring gear (203), a connecting rod (204), a cleaning plate (205) and an electromagnet (206) spin along an inner cavity of the main cover body (201);

The bottom of main cover body (201) is provided with seal assembly (4), seal assembly (4) are including blocking piece (401), hub disc (402) and servo motor (403), wherein in the front wall of main cover body (201) is movably set up to blocking piece (401), servo motor (403) are installed in the front side outer wall of main cover body (201), the output shaft of servo motor (403) carries out fixed connection through hub disc (402) and blocking piece (401), blocking piece (401) can rotate and airtight the blocking in the opening front end of main cover body (201), form inclosed clean chamber in ring frame (202) and outer ring tooth (203) in the messenger.

2. A projection device for human resource management teaching according to claim 1 and characterized in that: the inner cavity of the driving pipe (302) is communicated with a cleaning cavity formed by enclosing the inner ring frame (202) and the outer ring teeth (203) through a flow guide pipe (305).

3. A projection device for human resource management teaching according to claim 2 and characterized in that: the outer edge of the inner ring frame (202) is provided with an opening for the cleaning plate (205) and the electromagnet (206) to pass through, and the front wall of the main cover body (201) is internally provided with a cavity for the baffle plate (401) to move in a sweeping way.

4. A projection device for human resource management teaching according to claim 1 and characterized in that: the utility model provides a flow subassembly (5) is including supplying flow tee bend (501), liquid pump (502), first solenoid valve (503), air pump (504) and second solenoid valve (505), wherein supply the single-end on flow tee bend (501) top is linked together with heat exchange tube (7), and a branch of supplying flow tee bend (501) bottom is connected with first solenoid valve (503) and liquid pump (502), and another branch of supplying flow tee bend (501) bottom is connected with second solenoid valve (505) and air pump (504), supply flow tee bend (501), liquid pump (502), first solenoid valve (503) and air pump (504) are covered in its inside by second solenoid valve (505), and second solenoid valve (505) fixed mounting is on the diapire of host computer body (101).

5. A projection device for human resource management teaching according to claim 1 and characterized in that: the reflux assembly (6) comprises a water tank (601), a filter element (602), a reflux tee joint (603), a third electromagnetic valve (604) and a fourth electromagnetic valve (605), wherein the water tank (601) is fixedly arranged on the bottom wall of the projector (1), the filter element (602) is arranged in the inner cavity of the water tank (601), the inner cavity of the water tank (601) is divided into an upper part and a lower part by the filter element (602) to form a precipitation cavity and a water purifying cavity respectively, a single head at the top end of the reflux tee joint (603) is communicated with the inner cavity of the main cover body (201), one branch at the bottom end of the reflux tee joint (603) is connected with the precipitation cavity of the water tank (601), the third electromagnetic valve (604) is arranged on the branch, the other branch at the bottom end of the reflux tee joint (603) points to the outside, and the fourth electromagnetic valve (605) is arranged on the branch.