Water cooling structure for laser projector

Abstract

The invention discloses a water cooling structure for a laser projector, and relates to the technical field of projector cooling. Comprising a base plate, a shell cover is detachably installed on the base plate, an installation groove is formed in the upper surface of the base plate, a hollowed-out plate is fixedly installed on the installation groove, and parts of the projector can be conveniently installed through the hollowed-out plate; a water cooling assembly is arranged on the base plate, a cooling pipeline is arranged on the water cooling assembly, the cooling pipeline is arranged in the mounting groove, the water cooling assembly comprises a support plate and a pump body which are fixedly mounted on the lower end face of the base plate, the pump body is located on the inner side of the support plate, and a driving motor is fixedly mounted on the support plate; and a pump shaft is fixedly mounted at the output end of the driving motor. Through multiple mechanisms of cooling liquid flowing, airflow guiding, automatic cleaning, water mist evaporation and the like, the heat dissipation capability of the projector is comprehensively improved, and it is ensured that equipment can still keep stable performance under high-load and long-time operation.

Description

Technical Field

[0001] The invention relates to the technical field of projector cooling, and in particular to a water cooling structure for a laser projector. Background Art

[0002] A projector is a device that can project images or videos onto a screen. With the development and improvement of technology, it has gradually replaced LCD screens in some environments. It has low cost and is widely used in homes, offices, schools and entertainment venues.

[0003] In the prior art, a Chinese patent with publication number "CN114077132A" discloses a multimedia teaching projector. The projector can be automatically and slowly folded upwards and stored in a square cover through a folding mechanism, which can prevent the projector from accumulating dust for a long time and prevent it from being damaged by water. The temperature inside the projector is controlled through the cooperation of an air cooling mechanism and a water cooling mechanism, thus solving the problem that the existing projector is damaged and cannot be used due to excessive heat during operation.

[0004] The bulb of the projector is a consumable part. Since the imaging system and power system inside the projector will generate a lot of heat, the bulb will be shortened if it is kept at high temperature for a long time, and overheating will also cause damage to other parts inside the projector. In order to avoid this phenomenon, air cooling and water cooling are usually used to cool down the projector. As in the above scheme, the projector can be cooled by the cooperation of the air cooling mechanism and the water cooling mechanism. However, in the above scheme, when the fan blades discharge the heat in the projector, the airflow is hot air flow, and the copper tube is cooled by the hot air flow, and the cooling effect is not good. At the same time, the heat sink fins dissipate heat for the coolant for a second time, but in this process, since the heat sink fins are in the outside world, when too much dust falls on the heat sink fins, it will seriously affect the heat dissipation effect of the heat sink fins, and. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a water-cooling structure for a laser projector, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A water-cooling structure for a laser projector comprises a base plate, a shell cover is detachably mounted on the base plate, a mounting groove is formed on the upper surface of the base plate, a hollow plate is fixedly mounted on the mounting groove, and the parts of the projector are conveniently mounted through the hollow plate;

[0008] A water cooling component is arranged on the base plate, a cooling pipeline is arranged on the water cooling component, and the cooling pipeline is arranged inside the mounting groove.

[0009] Preferably, the water cooling assembly includes a bracket plate fixedly mounted on the lower end surface of the base plate and a pump body, the pump body is located on the inner side of the bracket plate, a drive motor is fixedly mounted on the bracket plate, a pump shaft is fixedly mounted on the output end of the drive motor, and one end of the pump shaft extends away from the drive motor to the interior of the pump body and is fixedly connected to the pump blades in the pump body.

[0010] Preferably, the outlet of the pump body is fixedly connected to a first through pipe, an end of the first through pipe away from the pump body extends to the interior of the mounting groove and is fixedly connected to the cooling pipe, the inlet of the pump body is fixedly connected to a second through pipe, an end of the second through pipe away from the pump body is fixedly connected to a cooling pipe, an end of the cooling pipe away from the second through pipe is fixedly connected to a third through pipe, an end of the third through pipe away from the cooling pipe extends to the interior of the mounting groove and is fixedly connected to the cooling pipe, a heat conducting plate is fixedly installed on the cooling pipe, and a plurality of heat dissipating fins are fixedly installed on the outer side of the heat conducting plate.

[0011] Preferably, a drive shaft and a rotating shaft are rotatably mounted on the inner side surface of the bracket plate, a worm wheel and a driving gear are fixedly mounted on the drive shaft, a worm is fixedly mounted on the side end surface of the pump shaft, and the driving gear is located outside the worm wheel.

[0012] Preferably, a driven gear and a rotating blade are fixedly mounted on the rotating shaft, the driven gear is meshed with the driving gear, the worm is driven to rotate through the pump shaft, and the rotating blade is rotated by utilizing the cooperation between the worm and the worm wheel and the cooperation between the driving gear and the driven gear.

[0013] Preferably, a side plate is fixedly installed on the side end surface of the bracket plate, a positioning slide rod is slidably installed on the side plate, a mounting plate is fixedly installed on the end away from the positioning slide rod, a plurality of connecting rods are fixedly installed on the mounting plate, and a cleaning block is fixedly installed on the end of the plurality of connecting rods away from the mounting plate.

[0014] Preferably, a cam is fixedly mounted on the rotating shaft, a return spring is fixedly mounted on the mounting plate, the cam slides in contact with the mounting plate, one end of the return spring away from the mounting plate is fixedly connected to the side plate, and the positioning slide rod is set to a T-shape.

[0015] Preferably, the cooling pipeline is fixedly connected with a shunt pipe, the top end of the shunt pipe extends to the bottom of the base plate, and a spray head is fixedly installed, and the water mist sprayed by the spray head is in front of the rotating blades.

[0016] Preferably, four support rods are fixedly installed on the lower end surface of the base plate and on the outer side of the support plate, the four support rods are respectively located at the four corners of the base plate, and a stabilizing rod is fixedly installed between the four support plates.

[0017] The present invention provides a water-cooling structure for a laser projector. Compared with the prior art, it has the following beneficial effects:

[0018] 1. The present invention provides a mounting groove at the bottom of the substrate, and arranges a hollow plate on the mounting groove, and arranges a cooling pipe inside the mounting groove, and drives the pump shaft through a driving motor to make the coolant in the cooling pipe flow, and then utilizes the holes on the hollow plate to facilitate the heat generated by the internal components of the projector to be absorbed by the coolant in the cooling pipe, thereby ensuring the normal use of the internal components of the projector and effectively improving the heat dissipation performance of the projector;

[0019] 2. In the present invention, when the pump shaft rotates, the worm will be driven to rotate. The worm cooperates with the worm wheel on the driving shaft. The rotation of the worm wheel drives the driving gear on the driving shaft to rotate. The driving gear is then meshed with the driven gear on the rotating shaft. The driven gear drives the rotating blades on the rotating shaft to rotate. The airflow generated by the rotating blades is used to blow air to the heat dissipation fins, thereby accelerating the heat dissipation effect of the heat dissipation fins while ensuring the cooling effect of the coolant, and effectively improving the cooling effect of the cooling pipeline on the projector;

[0020] 3. In the present invention, when the rotating shaft rotates, the rotating shaft drives the cam to push the mounting plate to move horizontally back and forth, and the mounting plate is in a reciprocating state through the elastic force of the return spring. The connecting rod on the mounting plate drives the cleaning block to move back and forth between the heat dissipation fins, and the cleaning block is used to clean the dust and impurities between the heat dissipation fins, thereby improving the heat dissipation effect of the heat dissipation fins and ensuring the cooling effect of the coolant;

[0021] 4. In the present invention, when the coolant in the cooling pipe flows, part of the coolant will enter the shunt pipe, and the coolant in the shunt pipe will be sprayed in front of the rotating blades through the spray head. The airflow generated by the rotating blades will drive the water mist into between the heat dissipation fins, and the evaporative cooling effect of the water mist will be used to improve the heat dissipation efficiency of the heat dissipation fins. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the hollow plate in the present invention;

[0024] Figure 3 It is a structural schematic diagram of the substrate in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the water cooling component in the present invention;

[0026] Figure 5 It is a structural schematic diagram of the cooling tube in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the side plate in the present invention;

[0028] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0029] Figure 8 It is a structural schematic diagram of the mounting plate in the present invention.

[0030] In the figure: 1. base plate; 2. shell cover; 3. mounting groove; 4. hollow plate; 5. cooling pipe; 6. bracket plate; 7. pump body; 8. driving motor; 9. pump shaft; 10. first through pipe; 11. second through pipe; 12. cooling pipe; 13. third through pipe; 14. heat conduction plate; 15. cooling fin; 16. driving shaft; 17. rotating shaft; 18. worm gear; 19. driving gear; 20. worm; 21. driven gear; 22. rotating blade; 23. side plate; 24. positioning slide rod; 25. mounting plate; 26. connecting rod; 27. cleaning block; 28. cam; 29. ​​reset spring; 30. shunt pipe; 31. spray head; 32. bracket rod; 33. stabilizing rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0032] See also Figure 1-8 The present invention is a water-cooling structure for a laser projector, comprising a base plate 1, a shell cover 2 is detachably mounted on the base plate 1, a mounting groove 3 is provided on the upper surface of the base plate 1, a hollow plate 4 is fixedly mounted on the mounting groove 3, and the hollow plate 4 is used to facilitate the installation of projector components, wherein the hollow plate 4 can be disassembled and installed according to the needs of personnel, and when the cooling pipeline is damaged, the hollow plate 4 can be removed;

[0033] A water cooling assembly is provided on the base plate 1, and a cooling pipe 5 is provided on the water cooling assembly. The cooling pipe 5 is arranged inside the mounting groove 3. The water cooling assembly includes a bracket plate 6 and a pump body 7 fixedly mounted on the lower end surface of the base plate 1. The pump body 7 is located on the inner side of the bracket plate 6. A driving motor 8 is fixedly mounted on the bracket plate 6. A pump shaft 9 is fixedly mounted on the output end of the driving motor 8. The end of the pump shaft 9 away from the driving motor 8 extends to the inside of the pump body 7 and is fixedly connected to the pump blades in the pump body 7. The outlet of the pump body 7 is fixedly connected to a first through pipe 10, wherein the pump blades in the pump body 7 are well known to those skilled in the art and are not described in detail here. The end of the first through pipe 10 away from the pump body 7 extends to the inside of the mounting groove 3 and is fixedly connected to the cooling pipe 5. The inlet of the pump body 7 is fixedly connected to a second through pipe 11, and the first through pipe 12 is fixedly connected to the pump body 7. One end of the second-way pipe 11 away from the pump body 7 is fixedly connected to a cooling pipe 12, and one end of the cooling pipe 12 away from the second through pipe 11 is fixedly connected to a third through pipe 13. One end of the third through pipe 13 away from the cooling pipe 12 extends to the inside of the mounting groove 3, and the cooling pipe 5 is fixedly connected, a heat conducting plate 14 is fixedly installed on the cooling pipe 12, and a plurality of heat dissipating fins 15 are fixedly installed on the outer side of the heat conducting plate 14, wherein the cooling pipe 5 is arranged in a snake shape to increase the contact area between the cooling pipe 5 and the internal heat of the projector, wherein the material of the cooling pipe 12 is a heat conducting material, and the cooling pipe 12 is used to facilitate the transfer of heat in the coolant to the heat conducting plate 14, and then the heat dissipating fins 15 on the heat conducting plate 14 are used to quickly dissipate the heat, wherein the pump body 7 can be a centrifugal pump, and the centrifugal pump is used to complete the circulation of cooling water.

[0034] In this article, a mounting groove 3 is opened at the bottom of the substrate 1, and a hollow plate 4 is arranged on the mounting groove 3, and a cooling pipe 5 is arranged inside the mounting groove 3. The pump shaft 9 is driven by the driving motor 8 to make the coolant in the cooling pipe 5 flow, and then the holes on the hollow plate 4 are used to facilitate the heat generated by the internal components of the projector to be absorbed by the coolant in the cooling pipe 5, thereby ensuring the normal use of the internal components of the projector and effectively improving the heat dissipation performance of the projector.

[0035] A drive shaft 16 and a rotating shaft 17 are rotatably mounted on the inner side surface of the bracket plate 6, a worm wheel 18 and a driving gear 19 are fixedly mounted on the drive shaft 16, a worm 20 is fixedly mounted on the side end surface of the pump shaft 9, the driving gear 19 is located on the outside of the worm wheel 18, a driven gear 21 and a rotating blade 22 are fixedly mounted on the rotating shaft 17, the driven gear 21 is meshed with the driving gear 19, the worm 20 is driven to rotate by the pump shaft 9, the cooperation of the worm 20 with the worm wheel 18 and the cooperation of the driving gear 19 with the driven gear 21 are utilized to rotate the rotating blade 22, wherein the drive shaft 16 and the rotating shaft 17 are in the same horizontal plane, and the driving gear 19 is several times the driven gear 21, ensuring that when the driving gear 19 rotates one circle, the driven gear 21 rotates multiple circles, ensuring that the rotating blade 22 can generate airflow.

[0036] In this article, when the pump shaft 9 rotates, the worm 20 is driven to rotate. The worm 20 cooperates with the worm wheel 18 on the drive shaft 16. The rotation of the worm wheel 18 drives the driving gear 19 on the drive shaft 16 to rotate, and then the driving gear 19 is engaged with the driven gear 21 on the rotating shaft 17. The driven gear 21 is used to drive the rotating blades 22 on the rotating shaft 17 to rotate, and the airflow generated by the rotating blades 22 is used to blow the heat dissipation fins 15, thereby accelerating the heat dissipation effect of the heat dissipation fins 15 while ensuring the cooling effect of the coolant, effectively improving the cooling effect of the cooling pipe 5 on the projector.

[0037] A side plate 23 is fixedly installed on the side end surface of the bracket plate 6, and a positioning slide bar 24 is slidably installed on the side plate 23. A mounting plate 25 is fixedly installed on the end of the positioning slide bar 24 away from the mounting plate 25. A plurality of connecting rods 26 are fixedly installed on the mounting plate 25, and a cleaning block 27 is fixedly installed on the end of the plurality of connecting rods 26 away from the mounting plate 25. A cam 28 is fixedly installed on the rotating shaft 17, and a return spring 29 is fixedly installed on the mounting plate 25. The cam 28 contacts and slides with the mounting plate 25, and the end of the return spring 29 away from the mounting plate 25 is fixedly connected to the side plate 23. The shape of the positioning slide bar 24 is set to be T-shaped. The T-shaped positioning slide bar 24 is used to ensure that the mounting plate 25 will not detach during reciprocating movement. A cleaning brush can be installed on the cleaning block 27 according to the needs of personnel, and the cleaning brush is used to complete the cleaning of the heat dissipating fins 15. The number of the return springs 29 is multiple, which ensures the stability of the mounting plate 25 when it reciprocates on a horizontal plane.

[0038] In this article, when the rotating shaft 17 rotates, the rotating shaft 17 will drive the cam 28 to reciprocate and push the mounting plate 25 to move horizontally. The mounting plate 25 is then in a reciprocating state through the elastic force of the return spring 29. The connecting rod 26 on the mounting plate 25 will drive the cleaning block 27 to move back and forth between the cooling fins 15. The cleaning block 27 is used to clean the dust and impurities between the cooling fins 15, thereby improving the heat dissipation effect of the cooling fins 15 and ensuring the cooling effect of the coolant.

[0039] A shunt pipe 30 is fixedly connected to the cooling pipe 5, the top end of the shunt pipe 30 extends to the bottom of the substrate 1, and a spray head 31 is fixedly installed. The water mist sprayed by the spray head 31 is in front of the rotating blade 22. Four support rods 32 are fixedly installed on the lower end surface of the substrate 1 and on the outer side of the support plate 6. The four support rods 32 are respectively located at the four corners of the substrate 1. A stabilizing rod 33 is fixedly installed between the four support plates 6. The four support rods 32 and the stabilizing rod 33 are used to ensure the stability of the projector, and a timing switch can be set on the shunt pipe 30 to enable the spray head 31 to spray water mist at a regular interval. Since the timing switch is a technology well known to people in this field, it will not be described in detail here.

[0040] Herein, when the coolant in the cooling pipe 5 flows, part of the coolant will enter the shunt pipe 30, and the coolant in the shunt pipe 30 will be sprayed in front of the rotating blades 22 through the spray nozzle 31. The airflow generated by the rotating blades 22 will drive the water mist into between the cooling fins 15, and the evaporative cooling effect of the water mist will be used to improve the heat dissipation efficiency of the cooling fins 15.

[0041] Working principle:

[0042] When in use, a mounting groove 3 is opened at the bottom of the base plate 1, and a hollow plate 4 is arranged on the mounting groove 3, and a cooling pipe 5 is arranged inside the mounting groove 3. The pump shaft 9 is driven by the driving motor 8 to rotate the pump blades in the pump body 7, and then the cooling water circulates in the cooling pipe 5 through the communication of the first through pipe 10, the second through pipe 11, the cooling pipe 12 and the third through pipe 13. The heat generated by the internal heat dissipation device of the projector is absorbed by the cooling pipe 5 through the holes of the hollow plate 4, and the heat in the cooling water is discharged through the heat dissipation fins 15 on the cooling pipe 12. The normal use of the internal devices of the projector is ensured by the circulation of the cooling water;

[0043] When the pump shaft 9 rotates, the worm 20 is driven to rotate. The worm 20 cooperates with the worm wheel 18 on the drive shaft 16. The rotation of the worm wheel 18 drives the driving gear 19 on the drive shaft 16 to rotate. The driving gear 19 is then meshed with the driven gear 21 on the rotating shaft 17. The driven gear 21 drives the rotating blades 22 on the rotating shaft 17 to rotate. The airflow generated by the rotating blades 22 blows the heat dissipation fins 15 to accelerate the heat dissipation of the heat dissipation fins 15.

[0044] When the rotating shaft 17 rotates, the rotating shaft 17 drives the cam 28 to push the mounting plate 25 to move horizontally. The mounting plate 25 is in a reciprocating state through the elastic force of the return spring 29. The connecting rod 26 on the mounting plate 25 drives the cleaning block 27 to move back and forth between the heat dissipation fins 15, and the cleaning block 27 is used to clean the dust and impurities between the heat dissipation fins 15.

[0045] When the coolant in the cooling pipe 5 flows, part of the coolant will enter the shunt pipe 30, and the coolant in the shunt pipe 30 will be sprayed in front of the rotating blades 22 through the spray nozzle 31. The airflow generated by the rotating blades 22 will drive the water mist into between the cooling fins 15, and the evaporative cooling effect of the water mist will be used to improve the heat dissipation of the cooling fins 15.

[0046] In the present technical solution, since part of the coolant in the cooling pipe 5 will enter the shunt pipe and then be sprayed out through the spray head 31, in order to avoid the reduction of the coolant in the cooling pipe 5, a pipe for adding coolant can be fixedly connected to the first through pipe 10 or the third through pipe 13. Since this technology is well known to people in this field, it will not be described in detail here. In addition, since the cam 28 in the present technical solution only contacts a certain point of the mounting plate 25, in order to avoid the mounting plate 25 from being offset when moving, the length of the mounting plate 25 can be adjusted according to the needs of personnel. Without affecting the use of the projector, the contact point between the cam 28 and the mounting plate 25 is set at the center position of the mounting plate 25. At the same time, the friction between the positioning rod 24 and the side plate 23 can also be reduced to ensure that the mounting plate 25 will immediately move horizontally when squeezed.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A water-cooling structure for a laser projector, comprising a substrate (1), characterized in that: A shell cover (2) is detachably mounted on the base plate (1); a mounting groove (3) is provided on the upper surface of the base plate (1); a hollow plate (4) is fixedly mounted on the mounting groove (3); and components of the projector can be easily mounted through the hollow plate (4); A water cooling component is provided on the base plate (1), a cooling pipe (5) is provided on the water cooling component, and the cooling pipe (5) is arranged inside the installation groove (3).

2. A water cooling structure for a laser projector according to claim 1, characterized in that: The water cooling assembly comprises a support plate (6) fixedly mounted on the lower end surface of the base plate (1) and a pump body (7); the pump body (7) is located on the inner side of the support plate (6); a drive motor (8) is fixedly mounted on the support plate (6); a pump shaft (9) is fixedly mounted on the output end of the drive motor (8); an end of the pump shaft (9) away from the drive motor (8) extends to the interior of the pump body (7) and is fixedly connected to a pump blade in the pump body (7).

3. The water cooling structure of a laser projector according to claim 2, characterized in that: The outlet of the pump body (7) is fixedly connected to a first through pipe (10), one end of the first through pipe (10) away from the pump body (7) extends to the interior of the mounting groove (3) and is fixedly connected to the cooling pipe (5), the inlet of the pump body (7) is fixedly connected to a second through pipe (11), one end of the second through pipe (11) away from the pump body (7) is fixedly connected to a cooling pipe (12), one end of the cooling pipe (12) away from the second through pipe (11) is fixedly connected to a third through pipe (13), one end of the third through pipe (13) away from the cooling pipe (12) extends to the interior of the mounting groove (3) and is fixedly connected to the cooling pipe (5), a heat conduction plate (14) is fixedly mounted on the cooling pipe (12), and a plurality of heat dissipation fins (15) are fixedly mounted on the outer side of the heat conduction plate (14).

4. The water cooling structure of a laser projector according to claim 2, characterized in that: A drive shaft (16) and a rotating shaft (17) are rotatably mounted on the inner side surface of the bracket plate (6); a worm wheel (18) and a driving gear (19) are fixedly mounted on the drive shaft (16); a worm (20) is fixedly mounted on the side end surface of the pump shaft (9); and the driving gear (19) is located outside the worm wheel (18).

5. The water cooling structure of a laser projector according to claim 4, characterized in that: A driven gear (21) and a rotating blade (22) are fixedly mounted on the rotating shaft (17); the driven gear (21) meshes with the driving gear (19); the worm (20) is driven to rotate via the pump shaft (9); and the rotating blade (22) is rotated by the cooperation between the worm (20) and the worm wheel (18) and the cooperation between the driving gear (19) and the driven gear (21).

6. The water cooling structure of a laser projector according to claim 4, characterized in that: A side plate (23) is fixedly mounted on the side end surface of the bracket plate (6), a positioning slide rod (24) is slidably mounted on the side plate (23), a mounting plate (25) is fixedly mounted on the end away from the positioning slide rod (24), a plurality of connecting rods (26) are fixedly mounted on the mounting plate (25), and a cleaning block (27) is fixedly mounted on the end of the plurality of connecting rods (26) away from the mounting plate (25).

7. The water cooling structure of a laser projector according to claim 6, characterized in that: A cam (28) is fixedly mounted on the rotating shaft (17), a return spring (29) is fixedly mounted on the mounting plate (25), the cam (28) contacts and slides with the mounting plate (25), one end of the return spring (29) away from the mounting plate (25) is fixedly connected to the side plate (23), and the positioning slide rod (24) is set to be T-shaped.

8. The water cooling structure of a laser projector according to claim 1, characterized in that: The cooling pipe (5) is fixedly connected to a shunt pipe (30), the top end of the shunt pipe (30) extends to the bottom of the base plate (1), and a spray head (31) is fixedly installed, and the water mist sprayed by the spray head (31) is located in front of the rotating blade (22).

9. The water cooling structure of a laser projector according to claim 2, characterized in that: Four support rods (32) are fixedly mounted on the lower end surface of the base plate (1) and on the outer side of the support plate (6); the four support rods (32) are respectively located at four corners of the base plate (1); and a stabilizing rod (33) is fixedly mounted between the four support plates (6).

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