A crystal end surface heat dissipation device in a solid laser

Abstract

The present invention discloses a crystal end face heat dissipation device in a solid laser, comprising a first heat sink assembly, a second heat sink assembly, a crystal rod, a diamond heat sink, a support frame, a support column head, a heat dissipation fan, a side clamping plate, a mounting bolt, a limiting nut, a movable heat dissipation wrapping plate structure, an operation support seat structure, a heat dissipation conveying box structure, a first mounting cavity and a second mounting cavity, wherein the first heat sink assembly bolts are mounted on the inner side of the second heat sink assembly, and the first mounting cavity is opened on the lower side of the first heat sink assembly and the second mounting cavity is opened on the upper side of the second heat sink assembly; the crystal rod is inserted into the right side of the first mounting cavity and the second mounting cavity; the diamond heat sink is inserted into the left side of the first mounting cavity and the second mounting cavity. The beneficial effect of the present invention is that the crystal rod is clamped and wrapped for fixed use by setting the movable heat dissipation wrapping plate structure.

Description

Technical Field

[0001] The invention belongs to the technical field of solid laser heat dissipation, and in particular relates to a crystal end face heat dissipation device in a solid laser. Background Art

[0002] Solid-state lasers are lasers that use solid laser materials as working materials. The working medium is a small amount of activated ions uniformly doped into the crystal or glass as the matrix material. The laser doped with trivalent neodymium ions in the yttrium aluminum garnet (YAG) crystal can emit near-infrared lasers with a wavelength of 1050 nanometers. When the crystal end face heatsinks in existing solid-state lasers, the end face heat sink is directly used to assist the work, thereby ensuring the working effect of the crystal and better application.

[0003] However, the existing crystal end face heat dissipation device in the solid-state laser still has the problems of inconvenience in connecting the auxiliary heat dissipation accessories to the crystal end face, small range of heat dissipation of the crystal end face by the device and poor heat dissipation effect of the device.

[0004] Therefore, it is very necessary to invent a crystal end face heat dissipation device in a solid-state laser. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a crystal end face heat dissipation device in a solid-state laser to solve the problems that the existing crystal end face heat dissipation device in a solid-state laser is not convenient for connecting the auxiliary heat dissipation accessories with the crystal end face, the range of heat dissipation of the crystal end face by the device is small and the heat dissipation effect of the device is poor.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a crystal end face heat dissipation device in a solid laser, comprising a first heat sink component, a second heat sink component, a crystal rod, a diamond heat sink, a support frame, a support column head, a heat dissipation fan, a side clamping plate, a mounting bolt, a limiting nut, a movable heat dissipation wrapping plate structure, an operating support seat structure, a heat dissipation conveying box structure, a first mounting cavity and a second mounting cavity, the first heat sink component is bolted to the inner side of the second heat sink component, and the first mounting cavity is opened on the lower side of the first heat sink component and the second mounting cavity is opened on the upper side of the second heat sink component; the crystal rod is inserted into the right side of the first mounting cavity and the second mounting cavity; the diamond heat sink is inserted into the left side of the first mounting cavity and the second mounting cavity; support column heads are welded at the four corners of the inner wall of the support frame; the heat dissipation fan is bolted to the left and right sides of the inner wall of the support frame; the side clamping plate is fixed by mounting screws The bolts are fixed on the front and rear surfaces of the support frame, and the side clamping plates are clamped on the outer walls of the first heat sink assembly and the second heat sink assembly; the limiting nut is installed on the outer side of the movable heat dissipation wrapping plate structure; the movable heat dissipation wrapping plate structure is installed in the operating support seat structure; the operating support seat structure is installed on the outer wall of the diamond heat sink; the heat dissipation conveying box structure is installed on the outer side of the movable heat dissipation wrapping plate structure; the movable heat dissipation wrapping plate structure includes a wrapping sleeve, a wrapping cavity, a serpentine tube, a first flow tube, a second flow tube and an installation tube, a wrapping cavity is opened on the lower side of the wrapping sleeve, and a serpentine tube is embedded on the outer side of the interior of the wrapping sleeve; the upper and lower sides of the right end of the serpentine tube are inlaid with the second flow tube and the first flow tube; the installation tube is movably embedded in the upper right side of the interior of the wrapping sleeve, and the first flow tube and the second flow tube are inserted in the installation tube; a limiting nut is threaded on the outer wall of the installation tube.

[0007] Preferably, the operating support seat structure includes an assembly sleeve, an insertion cylinder, a limiting ring, an internal threaded cylinder, an operating anti-slip disk and a support bearing, and an insertion cylinder is welded to the right end of the assembly sleeve; the limiting ring is threadedly connected to the lower part of the outer wall of the internal threaded cylinder, and the internal threaded cylinder is embedded in the inner ring of the support bearing; the operating anti-slip disk bolt is installed on the upper part of the outer wall of the internal threaded cylinder; and the support bearing is embedded in the middle part of the inner wall of the insertion cylinder.

[0008] Preferably, the heat dissipation and delivery box structure includes a storage box, a water pump, a first hose, a second hose, a holder and a rotating cover structure, the water pump is installed on the lower bolts at the front end of the storage box, and the first hose is embedded in the front end of the water pump; the second hose passes through the upper left part of the storage box and is embedded in the holder; the rotating cover structure is installed at the upper end of the storage box.

[0009] Preferably, the rotating cover structure includes a tight cover, a ventilation fan, a strip, a rotating motor, a transmission frame, a hopper and a filter screen, and the ventilation fans are bolted on both sides of the left and right sides of the tight cover; the strips are bolted on the middle part of the tight cover, and the rotating motor is bolted on the middle part of the upper surface of the strips; the output shaft of the rotating motor is inlaid with a transmission frame, and the lower end of the transmission frame is bolted to the hopper; the outer side of the hopper is inlaid with a filter screen.

[0010] Preferably, the wrapping sleeve and the wrapping cavity are both sleeved on the upper and lower parts of the left side of the outer wall of the crystal rod, and the wrapping sleeve is inserted into the middle left side of the first installation cavity and the second installation cavity.

[0011] Preferably, the installation tube is configured as an inverted T-shape, and the installation tube is movably supported by a wrapping sleeve, and the installation tube is inserted into the left side of the first heat sink assembly and the second heat sink assembly.

[0012] Preferably, the assembly sleeve is a copper sleeve, and the assembly sleeve is arranged in a U shape, and the assembly sleeve is embedded in the upper and lower parts of the outer wall of the diamond heat sink.

[0013] Preferably, the internal threaded barrel cooperates with the anti-skid disc to be assembled in a T-shape, and the internal threaded barrel is supported inside the insertion barrel by a support bearing.

[0014] Preferably, the lower part of the front end of the storage box is connected to the water pump, the first hose on the outer wall of the storage box is embedded in the upper end of the first flow pipe, and the second hose is embedded in the upper end of the second flow pipe.

[0015] Preferably, the socket bolt is installed on the left side of the lower surface of the tight cover, and the inner side of the socket supports the second hose, and the tight cover is threadedly connected to the upper part of the inner wall of the storage box.

[0016] Preferably, the output shaft of the rotating motor cooperates with the transmission frame to drive the receiving hopper to rotate, and a through hole is opened on the outer wall of the receiving hopper.

[0017] Preferably, the ventilation fan inside the tight cover corresponds to the receiving hopper.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention, the arrangement of the wrapping sleeve and the wrapping cavity is used to clamp and wrap the crystal rod for fixed use.

[0020] In the present invention, the arrangement of the serpentine tube, the first flow tube and the second flow tube assists in heat dissipation around the end face of the crystal rod.

[0021] In the present invention, the installation tube is arranged to cooperate with the rotation of the internal thread tube, so that the wrapping sleeve can be used closely against the installation location.

[0022] In the present invention, the assembly sleeve is provided and used in conjunction with the interlaced tube support.

[0023] In the present invention, the insertion tube and the support bearing are arranged to be installed and rotated in cooperation with the internal threaded tube.

[0024] In the present invention, the arrangement of the limiting ring, the internal threaded cylinder and the operation anti-skid plate facilitates manual operation and drives the installation cylinder to rise and fall.

[0025] In the present invention, the storage box, the water pump, the first hose and the second hose are arranged to store the coolant and then transport it for use.

[0026] In the present invention, the provision of the tight cover and the ventilation fan can help to dissipate heat while sealing the storage box.

[0027] In the present invention, the strips and the transmission frame are installed and assembled in coordination with other structures for use.

[0028] In the present invention, the rotating motor, the material receiving hopper and the filter screen are arranged to rotate to assist the cooling liquid in filtering and then rotate to achieve heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a structural schematic diagram of the movable heat dissipation wrapping plate structure of the present invention.

[0031] Figure 3 It is a structural schematic diagram of the operating support seat structure of the present invention.

[0032] Figure 4 It is a structural schematic diagram of the heat dissipation and conveying box structure of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the rotary cover structure of the present invention.

[0034] Figures 1 to 5 middle:

[0035] 1. First heat sink assembly; 2. Second heat sink assembly; 3. Crystal rod; 4. Diamond heat sink; 5. Support frame; 6. Support column head; 7. Heat dissipation fan; 8. Side clamping plate; 9. Mounting bolt; 10. Limiting nut; 11. Active heat dissipation wrapping plate structure; 111. Wrapping sleeve plate; 112. Wrapping cavity; 113. Serpentine tube; 114. First flow tube; 115. Second flow tube; 116. Mounting tube; 12. Operation support seat structure; 121. Assembly sleeve; 122. Insertion tube; 123. Limiting Ring; 124, internal threaded cylinder; 125, operation anti-skid plate; 126, support bearing; 13, heat dissipation and conveying box structure; 131, storage box; 132, water pump; 133, first hose; 134, second hose; 135, holder; 136, rotating cover structure; 1361, tight cover; 1362, ventilation fan; 1363, strip; 1364, rotating motor; 1365, transmission frame; 1366, receiving hopper; 1367, filter; 14, first installation cavity; 15, second installation cavity. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings:

[0037] As attached Figure 1 As shown, a crystal end face heat dissipation device in a solid laser described in the present invention comprises a first heat sink component 1, a second heat sink component 2, a crystal rod 3, a diamond heat sink 4, a support frame 5, a support column head 6, a heat dissipation fan 7, a side clamping plate 8, a mounting bolt 9, a limiting nut 10, a movable heat dissipation wrapping plate structure 11, an operating support seat structure 12, a heat dissipation conveying box structure 13, a first installation cavity 14 and a second installation cavity 15. The first heat sink component 1 is bolted to the inner side of the second heat sink component 2, and the first installation cavity 14 is opened on the lower side of the first heat sink component 1 and the second installation cavity 15 is opened on the upper side of the second heat sink component 2; the crystal rod 3 is inserted into the right side of the first installation cavity 14 and the second installation cavity 15; the gold The diamond heat sink 4 is inserted into the left side of the first installation cavity 14 and the second installation cavity 15; support column heads 6 are welded at the four corners of the inner wall of the support frame 5; the cooling fans 7 are bolted on the left and right sides of the inner wall of the support frame 5; the side clamping plates 8 are fixed to the front and rear surfaces of the support frame 5 by mounting bolts 9, and the side clamping plates 8 are clamped on the outer walls of the first heat sink assembly 1 and the second heat sink assembly 2; the limiting nut 10 is installed on the outside of the movable heat dissipation wrapping plate structure 11; the movable heat dissipation wrapping plate structure 11 is installed in the operating support seat structure 12; the operating support seat structure 12 is installed on the outer wall of the diamond heat sink 4; the heat dissipation conveying box structure 13 is installed on the outside of the movable heat dissipation wrapping plate structure 11.

[0038] As attached Figure 2As shown, in the above embodiment, specifically, the movable heat dissipation wrapping plate structure 11 includes a wrapping sleeve 111, a wrapping cavity 112, a serpentine tube 113, a first flow tube 114, a second flow tube 115 and a mounting tube 116. The wrapping sleeve 111 is provided with a wrapping cavity 112 at the lower side, and a serpentine tube 113 is embedded on the outer side of the wrapping sleeve 111; the movable wrapping sleeve 111 is fixed around the end face of the crystal rod 3 through the wrapping cavity 112; the upper and lower sides of the right end of the serpentine tube 113 are both inlaid with the second flow tube 115. and the first flow tube 114; the mounting tube 116 is movably embedded in the upper right side of the wrapping sleeve 111, and the first flow tube 114 and the second flow tube 115 are inserted in the mounting tube 116; the outer wall of the mounting tube 116 is threadedly connected with a limiting nut 10; the diamond heat sink 4 and the crystal rod 3 are placed in the first mounting cavity 14 and the second mounting cavity 15, and the mounting tube 116 is also inserted into the first heat sink assembly 1 and the second heat sink assembly 2, and then the limiting nut 10 is turned on the outer wall of the mounting tube 116 to fix and complete the assembly.

[0039] As attached Figure 3 As shown, in the above embodiment, specifically, the operating support seat structure 12 includes an assembly sleeve 121, an insertion tube 122, a limiting ring 123, an internal threaded tube 124, an operating anti-skid disk 125 and a support bearing 126, and the right end of the assembly sleeve 121 is welded with an insertion tube 122; the limiting ring 123 is threadedly connected to the lower part of the outer wall of the internal threaded tube 124, and the internal threaded tube 124 is embedded in the inner ring of the support bearing 126; the rotating internal threaded tube 124 drives the installation tube 116 to rotate and drives the wrapping sleeve 111 to move; the operating anti-skid disk 125 is bolted to the upper part of the outer wall of the internal threaded tube 124; the rotating operating anti-skid disk 125 drives the internal threaded tube 124 to cooperate with the support bearing 126 to rotate in the insertion tube 122; the support bearing 126 is embedded in the middle part of the inner wall of the insertion tube 122.

[0040] As attached Figure 4 As shown, in the above embodiment, specifically, the heat dissipation and delivery box structure 13 includes a storage box 131, a water pump 132, a first hose 133, a second hose 134, a holder 135 and a rotating cover structure 136, the lower bolt at the front end of the storage box 131 is installed with the water pump 132, and the first hose 133 is embedded at the front end of the water pump 132; the water pump 132 is driven to allow the coolant in the storage box 131 to enter the serpentine tube 113 through the first hose 133 and the first flow tube 114 and assist in the heat dissipation around the crystal rod 3; the second hose 134 passes through the upper left part of the storage box 131 and is embedded in the holder 135; the rotating cover structure 136 is installed at the upper end of the storage box 131.

[0041] As attached Figure 5 As shown, in the above embodiment, specifically, the rotating cover structure 136 includes a tight cover 1361, a ventilation fan 1362, a strip 1363, a rotating motor 1364, a transmission frame 1365, a hopper 1366 and a filter 1367, and the ventilation fans 1362 are bolted on both sides of the inside of the tight cover 1361; during the heat dissipation process, the ventilation fan 1362 cooperates with the cooling liquid that completes the filtration and heat dissipation to enter the storage box 131 for reuse to increase the heat dissipation efficiency; the strip 1363 is bolted to the middle part of the inside of the tight cover 1361, At the same time, a rotating motor 1364 is bolted to the middle part of the upper surface of the strip 1363; the rotating motor 1364 works and cooperates with the transmission frame 1365 to drive the receiving hopper 1366 to rotate, thereby cooperating with the filter screen 1367 to filter the coolant and assist in dissipating the absorbed heat; the output shaft of the rotating motor 1364 is inlaid with the transmission frame 1365, and the lower end of the transmission frame 1365 is bolted to the receiving hopper 1366; the coolant flows through the second flow pipe 115 and the second hose 134 into the receiving hopper 1366; the outer side of the receiving hopper 1366 is inlaid with a filter screen 1367.

[0042] In the above embodiment, specifically, the heat dissipation fan 7 and the ventilation fan 1362 are both 9225HA type fans.

[0043] In the above embodiment, specifically, the water pump 132 is a water pump of model SFB-2418S-001.

[0044] In the above embodiment, specifically, the rotating motor 1364 adopts a JS-50T motor.

[0045] How it works

[0046] The working principle of the present invention is as follows: during the installation process, the end face of the crystal rod 3 is made to be close to the diamond heat sink 4, and then the anti-slip disk 125 is rotated to drive the internal threaded tube 124 to cooperate with the support bearing 126 to rotate in the insertion tube 122, and the rotating internal threaded tube 124 drives the installation tube 116 to rotate and drives the wrapping sleeve 111 to move, and at the same time, the movable wrapping sleeve 111 is fixed around the end face of the crystal rod 3 through the wrapping cavity 112, and finally the diamond heat sink 4 and the crystal rod 3 are placed in the first installation cavity 14 and the second installation cavity 15, and the installation cylinder 116 is also inserted into the first heat sink assembly 1 and the second heat sink assembly 2, and then the limiting nut 10 is turned on the outer wall of the installation cylinder 116 to fix and complete the assembly. During the cooling process, the diamond heat sink 4 absorbs the heat dissipated from the end face of the crystal rod 3 and cooperates with the first heat sink assembly Component 1 and the second heat sink component 2 perform preliminary heat dissipation. During the heat dissipation process of the first heat sink component 1 and the second heat sink component 2, the cooling fan 7 assists in the work. During the heat dissipation process, the water pump 132 is driven to allow the coolant in the storage box 131 to be transported into the serpentine tube 113 through the first hose 133 and the first flow tube 114 and assist in the heat dissipation around the crystal rod 3. Then, the coolant flows through the second flow tube 115 and the second hose 134 and enters the receiving hopper 1366. After arriving, the rotating motor 1364 works and cooperates with the transmission frame 1365 to drive the receiving hopper 1366 to rotate, thereby cooperating with the filter screen 1367 to filter the coolant and assist in dissipating the absorbed heat. During the heat dissipation process, the ventilation fan 1362 cooperates with the work, and the coolant that completes the filtration and heat dissipation enters the storage box 131 and is reused to increase the heat dissipation efficiency.

[0047] Utilizing the technical solution described in the present invention, or those skilled in the art designing a similar technical solution inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.

Claims

1. A crystal end face heat dissipation device in a solid laser, characterized in that: The crystal end face heat dissipation device in a solid laser comprises a first heat sink component (1), a second heat sink component (2), a crystal rod (3), a diamond heat sink (4), a support frame (5), a support column head (6), a heat dissipation fan (7), a side clamping plate (8), a mounting bolt (9), a limiting nut (10), a movable heat dissipation wrapping plate structure (11), an operating support seat structure (12), a heat dissipation conveying box structure (13), a first mounting cavity (14) and a second mounting cavity (15), wherein the first heat sink component (1) is bolted to the inner side of the second heat sink component (2), and the first mounting cavity (14) is provided on the lower side of the first heat sink component (1) and the second mounting cavity (15) is provided on the upper side of the second heat sink component (2). The mounting cavity (15); the crystal rod (3) is inserted into the right side of the first mounting cavity (14) and the second mounting cavity (15); the diamond heat sink (4) is inserted into the left side of the first mounting cavity (14) and the second mounting cavity (15); support column heads (6) are welded at the four corners of the inner wall of the support frame (5); the heat dissipation fan (7) is bolted to the left and right sides of the inner wall of the support frame (5); the side clamping plates (8) are fixed to the front and rear surfaces of the support frame (5) by mounting bolts (9), and the side clamping plates (8) are clamped on the outer walls of the first heat sink assembly (1) and the second heat sink assembly (2); the limiting nut (10) is installed on the movable heat dissipation wrapping plate structure (11) The movable heat dissipation wrapping plate structure (11) is installed in the operating support seat structure (12); the operating support seat structure (12) is installed on the outer wall of the diamond heat sink (4); the heat dissipation conveying box structure (13) is installed on the outer side of the movable heat dissipation wrapping plate structure (11); the movable heat dissipation wrapping plate structure (11) comprises a wrapping sleeve (111), a wrapping cavity (112), a serpentine tube (113), a first flow tube (114), a second flow tube (115) and a mounting tube (116); the wrapping sleeve (111) is provided with a wrapping cavity (112) on the lower side, and a serpentine tube (113) is embedded on the outer side of the wrapping sleeve (111); the serpentine tube (113) is embedded on the outer side of the wrapping sleeve (111); The upper side and the lower side of the right end of the shaped tube (113) are both inlaid with a second flow tube (115) and a first flow tube (114); the installation tube (116) is movably embedded in the upper right side of the interior of the wrapping sleeve (111), and the first flow tube (114) and the second flow tube (115) are inserted in the installation tube (116); a limiting nut (10) is threadedly connected on the outer wall of the installation tube (116); the operating support seat structure (12) comprises an assembly sleeve (121), an insertion sleeve (122), a limiting ring (123), an internal threaded sleeve (124), an operating anti-slip disc (125) and a supporting bearing (126), and the insertion sleeve (122) is welded to the right end of the assembly sleeve (121);The limiting ring (123) is threadedly connected to the lower part of the outer wall of the internal threaded tube (124), and the internal threaded tube (124) is embedded in the inner ring of the support bearing (126); the operating anti-skid plate (125) is bolted to the upper part of the outer wall of the internal threaded tube (124); the support bearing (126) is embedded in the middle part of the inner wall of the insertion tube (122); the assembly sleeve (121) is a copper sleeve, and the assembly sleeve (121) is set to be U-shaped, and the assembly sleeve (121) is inlaid At the upper and lower parts of the outer wall of the diamond heat sink (4), the internal threaded cylinder (124) cooperates with the operation anti-skid plate (125) to be assembled in a T shape, and the internal threaded cylinder (124) is supported inside the insertion cylinder (122) through a support bearing (126); the wrapping sleeve (111) cooperates with the wrapping cavity (112) to be sleeved on the upper and lower parts of the left side of the outer wall of the crystal rod (3), and the wrapping sleeve (111) is inserted into the middle left side of the first installation cavity (14) and the second installation cavity (15). ; 2. The crystal end face heat dissipation device in a solid-state laser as claimed in claim 1, characterized in that: The mounting tube (116) is configured in an inverted T-shape, and the mounting tube (116) is movably supported by the wrapping sleeve (111), and the mounting tube (116) is inserted into the left side of the first heat sink assembly (1) and the second heat sink assembly (2).

3. The crystal end face heat dissipation device in a solid-state laser as claimed in claim 1, characterized in that: The heat dissipation and transport box structure (13) comprises a storage box (131), a water pump (132), a first hose (133), a second hose (134), a holder (135) and a rotating cover structure (136); the water pump (132) is bolted to the lower portion of the front end of the storage box (131), and the first hose (133) is embedded in the front end of the water pump (132); the second hose (134) passes through the upper left portion of the storage box (131) and is embedded in the holder (135); and the rotating cover structure (136) is installed at the upper end of the storage box (131).

4. The crystal end face heat dissipation device in a solid-state laser as claimed in claim 3, characterized in that: The rotating cover structure (136) comprises a tight cover (1361), a ventilation fan (1362), a strip plate (1363), a rotating motor (1364), a transmission frame (1365), a material receiving hopper (1366) and a filter screen (1367). The ventilation fan (1362) is bolted to the left and right sides of the tight cover (1361); the strip plate (1363) is bolted to the middle part of the tight cover (1361), and the rotating motor (1364) is bolted to the middle part of the upper surface of the strip plate (1363); the output shaft of the rotating motor (1364) is inlaid with a transmission frame (1365), and the lower end of the transmission frame (1365) is bolted to the material receiving hopper (1366); the outer side of the material receiving hopper (1366) is inlaid with a filter screen (1367).

5. The crystal end face heat dissipation device in a solid-state laser as claimed in claim 3, characterized in that: The lower part of the front end of the storage box (131) is connected to the water pump (132), the first hose (133) on the outer wall of the storage box (131) is embedded in the upper end of the first flow tube (114), the second hose (134) is embedded in the upper end of the second flow tube (115), the holder (135) is bolted to the left side of the lower surface of the tight cover (1361), and the inner side of the holder (135) supports the second hose (134), and the tight cover (1361) is threadedly connected to the upper part of the inner wall of the storage box (131).

6. The crystal end face heat dissipation device in a solid-state laser as claimed in claim 4, characterized in that: The output shaft of the rotating motor (1364) cooperates with the transmission frame (1365) to drive the receiving hopper (1366) to rotate, and a through hole is provided on the outer wall of the receiving hopper (1366).

7. The crystal end face heat dissipation device in a solid-state laser as claimed in claim 4, characterized in that: The ventilation fan (1362) inside the tight cover (1361) corresponds to the material receiving hopper (1366).

Images