Sterilization equipment for mask production
By designing a sterilization device for mask production, and using multiple ultraviolet lamps and rack-driven flip mechanisms, the problem of ultraviolet rays that cannot be completely penetrated by the thickness of the mask is solved, and uniform disinfection on both sides of the mask is achieved, and the sterilization effect is improved.
Patent Information
- Application Number
- CN202410191506.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-21
- Publication Date
- 2025-03-28
AI Technical Summary
In the prior art, due to thickness, the mask cannot penetrate completely during irradiation, and the other side cannot be effectively disinfected and sterilized, thereby affecting the sterilization effect.
A sterilization equipment for mask production is designed, multiple ultraviolet lamps are evenly distributed above the conveyor belt, and the second gear is driven to rotate through the second rack, driving the fixing frame to rotate, so that the clamping mechanism drives the mask to flip, thereby ensuring that both sides are illuminated by ultraviolet rays.
By turning the mask over, it is ensured that both sides can be sterilized by ultraviolet rays, avoiding the barrier problem during single-sided irradiation and improving the sterilization effect.
Smart Images

Figure CN119701027A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of masks, and in particular to a sterilizing device used for mask production. Background Art
[0002] Masks are a kind of sanitary and epidemic prevention products, generally worn on the mouth and nose to filter the air entering the mouth and nose, so as to block harmful gases, odors, droplets, viruses and other substances. They are made of gauze or paper and other materials. When producing masks, they need to be sterilized. When sterilizing, ultraviolet light is generally used for sterilization. Ultraviolet light of appropriate wavelength can destroy the molecular structure of DNA or RNA in the cells of microorganisms, causing growth cell death and regenerative cell death, achieving the effect of sterilization and disinfection. When disinfecting, the mask is placed on the conveyor belt, one side of the mask is in contact with the conveyor belt, and the other side is irradiated by ultraviolet light. The ultraviolet light plays a role of sterilization, but because the mask has a certain thickness, especially some multi-layer masks, the mask will block the ultraviolet light when irradiating, so that the ultraviolet light cannot completely irradiate and disinfect the other side, thus affecting the sterilization effect. Summary of the invention
[0003] The purpose of the present invention is to solve the defect in the prior art that the other side cannot be completely irradiated and sterilized, thereby affecting the sterilization effect, and to propose a sterilization device for mask production.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions:
[0005] A sterilization device for mask production is designed, comprising a base, a conveyor belt is installed on the base, a support frame fixedly connected to the base is arranged above the conveyor belt, and a plurality of ultraviolet lamps are arranged on the support frame at equal distances;
[0006] A plurality of rubber blocks are fixedly connected to the conveyor belt, and the rubber blocks are used to place the masks;
[0007] The base is fixedly connected to a support seat, the support seat is connected to a fixed plate via an anti-wrinkle mechanism, the fixed plate is rotatably connected to a rotating rod via a bearing, the rotating rod is rotatably connected to a second gear via a one-way bearing, the second gear is meshed with a second rack, the second rack is driven by the anti-wrinkle mechanism, the rotating rod is fixedly connected to a fixing frame, and the fixing frame is provided with a clamping mechanism for a mask.
[0008] Preferably, the anti-wrinkle mechanism includes two threaded sleeves, which are rotatably connected to the support seat via bearings, and reciprocating threaded rods are threadedly connected in the two threaded sleeves, one of the reciprocating threaded rods is fixedly connected to a fixing plate, and the other reciprocating threaded rod is located directly below the second rack, the two reciprocating threaded rods are positioned by a positioning mechanism, and the two threaded sleeves are transmitted by a selection mechanism, a connecting block is fixedly connected to the fixing plate, an abutting block is fixedly connected to the second rack, the abutting block is located directly above the connecting block, and the second rack is limited by a limiting mechanism.
[0009] Preferably, the positioning mechanism comprises an anti-rotation sleeve, the anti-rotation sleeve is fixedly connected to the support seat, an anti-rotation rod can be inserted into the anti-rotation sleeve, and the anti-rotation rod is fixedly connected to the reciprocating threaded rod.
[0010] Preferably, the selection mechanism includes a third gear, the third gear is fixedly connected to the two threaded sleeves, a first motor is installed on the base, the first motor is transmission-connected to a rotating shaft, an incomplete gear is fixedly connected to the rotating shaft, and the incomplete gear is meshed with the third gear.
[0011] Preferably, the limiting mechanism comprises a limiting rod, the limiting rod is fixedly connected to the fixing plate, a connecting sleeve is fixedly connected to the second rack, and the limiting rod passes through the connecting sleeve.
[0012] Preferably, a second gear is fixedly connected to the main rotating roller of the conveyor belt, a sliding sleeve is fixedly connected to the base, an insertion rod is slidably provided in the sliding sleeve, one end of the insertion rod can be inserted into the teeth of the second gear, and the other end is fixedly connected to a pushing block, a connecting shell is fixedly connected to the base, an air outlet of the connecting shell is located directly below the pushing block, a piston is abutted in the connecting shell, a first rack is fixedly connected to the piston, and the first rack is transmission connected to the rotating shaft through a connecting mechanism.
[0013] Preferably, the connecting mechanism includes helical teeth, which are fixedly connected to the rotating shaft. Two pulleys are rotatably connected to the base via bearings, and a belt is provided between the two pulleys. One of the pulleys is rotatably connected to a first gear via a one-way bearing, and the first gear is meshed with the first rack. A worm wheel is fixedly connected to the other pulley, and the worm wheel is meshed with the helical teeth.
[0014] Preferably, the clamping mechanism includes a second motor, which is mounted on a fixed frame, and the fixed frame is rotatably connected to a bidirectional threaded rod through a bearing, and two fixed plates are threadedly connected to the bidirectional threaded rod, and positioning columns are arranged on the two fixed plates, and the positioning columns are fixedly connected to the fixed frame, and a controller for controlling the second motor is installed on the fixed frame.
[0015] The sterilization equipment for mask production proposed by the present invention has the beneficial effect of: by adopting the second rack to move, thereby driving the second gear to rotate, thereby driving the fixed frame to rotate, so that the clamping mechanism is rotated, thereby driving the mask to rotate, and turning the mask over, thereby ensuring that both sides of the mask are irradiated with ultraviolet rays, avoiding the obstruction caused by single-sided irradiation. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of a sterilization device for mask production proposed by the present invention;
[0017] Figure 2 A three-dimensional diagram of a sterilization device for mask production proposed by the present invention;
[0018] Figure 3 A front view of a sterilization device for mask production proposed by the present invention;
[0019] Figure 4 A three-dimensional structure of an anti-wrinkle mechanism of a sterilization equipment for mask production proposed by the present invention Figure 1 ;
[0020] Figure 5 A three-dimensional structure of an anti-wrinkle mechanism of a sterilization equipment for mask production proposed by the present invention Figure 2 ;
[0021] Figure 6 A front view of an anti-wrinkle mechanism of a sterilization device for mask production proposed by the present invention;
[0022] Figure 7 A three-dimensional diagram of a connection shell portion of a sterilization device for mask production proposed by the present invention;
[0023] Figure 8 A front view of a connecting shell portion of a sterilization device for mask production proposed by the present invention.
[0024] In the figure: 1, base; 2, placement plate; 3, conveyor belt; 4, rubber block; 5, support frame; 6, ultraviolet lamp; 7, first motor; 8, worm gear; 9, belt; 10, pulley; 11, first rack; 12, first gear; 13, second gear; 14, connecting shell; 15, spiral teeth; 16, rotating shaft; 17, fixed plate; 18, second motor; 19, fixed frame; 20, two-way threaded rod; 21, positioning column; 22, rotating rod; 23, second gear; 24, second rack; 25, fixed plate; 26, reciprocating threaded rod; 27, third gear; 28, incomplete gear; 29, support seat; 30, abutment block; 31, connecting block; 32, connecting sleeve; 33, limiting rod; 34, anti-rotation rod; 35, threaded sleeve; 36, sliding sleeve; 37, plug rod; 38, push block; 39, piston; 40, anti-rotation sleeve. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0026] Example 1
[0027] Reference Figure 1-6 A sterilization device for mask production includes a base 1, a conveyor belt 3 is installed on the base 1, a support frame 5 fixedly connected to the base 1 is arranged above the conveyor belt 3, and a plurality of ultraviolet lamps 6 are arranged on the support frame 5 at equal distances. The ultraviolet lamps 6 are used to irradiate and sterilize. The conveyor belt 3 conveys the masks, and a placement plate 2 fixedly connected to the base 1 is arranged at the end of the conveyor belt 3. The masks on the conveyor belt 3 will fall onto the placement plate 2 so as to collect the sterilized masks.
[0028] The clamping mechanism includes a second motor 18, which is mounted on a fixing frame 19. The fixing frame 19 is rotatably connected to a bidirectional threaded rod 20 through a bearing. The bidirectional threaded rod 20 is threadedly connected to two fixing plates 17. Positioning columns 21 are arranged on the two fixing plates 17. The positioning columns 21 prevent the fixing plates 17 from rotating and limit the fixing plates 17. The positioning columns 21 are fixedly connected to the fixing frame 19. A controller for controlling the second motor 18 is installed on the fixing frame 19. The second motor 18 is controlled by the controller. Since the masks are placed on the rubber block 4, the distance between each mask is constant. By intermittently rotating the second motor 18, the two fixing plates 17 clamp the masks located between the two fixing plates 17 so that the masks can be turned over later.
[0029] A plurality of rubber blocks 4 are fixedly connected to the conveyor belt 3, and the rubber blocks 4 are used to place the masks. The rubber blocks 4 are used to support the masks, so that there is a gap between the masks and the conveyor belt 3, so that the masks are located between the two fixed plates 17 and can be clamped.
[0030] A support seat 29 is fixedly connected to the base 1, and the support seat 29 is connected to a fixed plate 25 through an anti-wrinkle mechanism. A rotating rod 22 is rotatably connected to the fixed plate 25 through a bearing. A second gear 23 is rotatably connected to the rotating rod 22 through a one-way bearing. A second rack 24 is meshed with the second gear 23, and the second rack 24 is driven by the anti-wrinkle mechanism. A fixed frame 19 is fixedly connected to the rotating rod 22, and a clamping mechanism for a mask is provided on the fixed frame 19. The second rack 24 is moved to drive the second gear 23 to rotate, thereby driving the fixed frame 19 to rotate, so that the clamping mechanism is rotated, thereby driving the mask to rotate, and turning the mask over, thereby ensuring that both sides of the mask are irradiated with ultraviolet rays, avoiding the situation where obstruction occurs when using one-sided irradiation.
[0031] Example 2
[0032] In Example 1, since the mask is placed on the rubber block 4, when the mask is clamped and rotated, the mask conveyor belt 3 contacts the rubber block 4, which causes wrinkles on the mask, affecting the aesthetics of the mask. Figure 1-6As another preferred embodiment of the present invention, on the basis of embodiment 1, the anti-wrinkle mechanism includes two threaded sleeves 35, and the two threaded sleeves 35 are rotatably connected to the support seat 29 through bearings. Reciprocating threaded rods 26 are threadedly connected in the two threaded sleeves 35, one of the reciprocating threaded rods 26 is fixedly connected to a fixed plate 25, and the other reciprocating threaded rod 26 is located directly below the second rack 24. The two reciprocating threaded rods 26 are positioned by a positioning mechanism, and the two threaded sleeves 35 are driven by a selection mechanism. A connecting block 31 is fixedly connected to the fixed plate 25, and an abutment block 30 is fixedly connected to the second rack 24, and the abutment block 30 is located directly above the connecting block 31. The second rack 24 is limited by a limiting mechanism. When the first threaded sleeve 35 rotates, the fixed plate 25 will be driven to rise, thereby causing the clamped mask to rise, leaving a gap between the mask and the conveyor belt 3, thereby avoiding obstruction to the mask during subsequent rotation. The second gear 23 is rotated by the second threaded sleeve 35, and the second gear 23 is rotated by the second threaded sleeve 35, thereby driving the second reciprocating threaded rod 26 to move upward. The second reciprocating threaded rod 26 pushes the second gear 24 to move upward. At this time, the one-way bearing is in a locked state, driving the second gear 23 to rotate, thereby driving the rotating rod 22 to rotate, driving the mask to rotate 180°, and turning the mask over. After the turning over is completed, the second threaded sleeve 35 continues to rotate, causing the second reciprocating threaded rod 26 to move reciprocatingly downward. Since the second gear 23 adopts a one-way bearing, the second rack 24 will drive the second gear 23 to idle under the action of gravity, and the second rack 24 will descend, so that the abutment block 30 will abut against the connecting block 31 again. Figure 4 As shown, the incomplete gear 28 then re-engages with the third gear 27 on the first threaded sleeve 35, thereby driving the fixing plate 25 to descend and placing the mask on the rubber block 4, avoiding wrinkles on the mask when turning it over, thereby ensuring the aesthetics of the mask after disinfection and sterilization.
[0033] The positioning mechanism includes an anti-rotation sleeve 40, which is fixedly connected to the support seat 29. An anti-rotation rod 34 can be inserted into the anti-rotation sleeve 40, and the anti-rotation rod 34 is fixedly connected to the reciprocating threaded rod 26. By adopting the design of the anti-rotation rod 34 and the anti-rotation sleeve 40, the reciprocating threaded rod 26 is prevented from rotating, so that the reciprocating threaded rod 26 can only move up and down.
[0034] The selection mechanism includes a third gear 27, and the two threaded sleeves 35 are fixedly connected to the third gear 27. The base 1 is equipped with a first motor 7, and the first motor 7 is drivably connected to the rotating shaft 16. The rotating shaft 16 is fixedly connected to an incomplete gear 28, and the incomplete gear 28 is meshed with the third gear 27. By adopting the incomplete gear 28 to mesh with the third gear 27 at different positions, the mask can be raised, flipped and lowered to ensure the neatness of the mask after turning over.
[0035] The limiting mechanism includes a limiting rod 33, which is fixedly connected to the fixed plate 25. A connecting sleeve 32 is fixedly connected to the second rack 24. The limiting rod 33 passes through the connecting sleeve 32. By adopting the design of the connecting sleeve 32 and the limiting rod 33, the second rack 24 is limited to prevent the second rack 24 from being offset.
[0036] Example 3
[0037] In Example 2, since the conveyor belt 3 still moves when the mask is clamped and turned over, it is difficult to place the mask on the rubber block 4, causing the mask to be supported by the fixing plate 17, so that the mask is always located on the fixing plate 17, blocking the subsequent masks on the conveyor belt 3, thereby affecting the disinfection and sterilization of the mask. Figure 1-8 As another preferred embodiment of the present invention, on the basis of embodiment 2, the second gear 13 is fixedly connected to the main rotating roller of the conveyor belt 3, the sliding sleeve 36 is fixedly connected to the base 1, and a plug rod 37 is slidably arranged in the sliding sleeve 36, one end of the plug rod 37 can be inserted into the teeth of the second gear 13, and the other end is fixedly connected to a push block 38, and a connecting shell 14 is fixedly connected to the base 1, and the air outlet of the connecting shell 14 is located directly below the push block 38, and a piston 39 is abutted in the connecting shell 14, and a first rack 11 is fixedly connected to the piston 39, and the first rack 11 is transmission-connected to the rotating shaft 16 through a connecting mechanism, and the first rack 11 is driven to the rotating shaft 16 through the connecting mechanism. The air in the connecting shell 14 is compressed, and the air blows the push block 38 upward, and the insertion rod 37 is inserted into the teeth of the second gear 13 to fix the second gear 13, thereby fixing the conveyor belt 3, ensuring that the conveyor belt 3 is in a stationary state when the mask is turned over, ensuring that the mask is still on the rubber block 4 after turning over, avoiding obstruction to subsequent masks. After the turning over is completed, the first motor 7 stops rotating. Since there is no wind blowing out from the air outlet of the connecting shell 14, under the action of gravity, the insertion rod 37 moves downward, releases the limit fixation on the second gear 13, and allows the conveyor belt 3 to move again.
[0038] An obstruction block is fixedly connected to the connection shell 14 to prevent the piston 39 from being separated from the connection shell 14 .
[0039] The connecting mechanism includes a helical tooth 15, which is fixedly connected to a rotating shaft 16. Two pulleys 10 are rotatably connected to the base 1 through bearings. A belt 9 is sleeved between the two pulleys 10. One of the pulleys 10 is rotatably connected to a first gear 12 through a one-way bearing. The first gear 12 is meshed with a first rack 11. A worm wheel 8 is fixedly connected to the other pulley 10, which is meshed with the helical tooth 15. When the rotating shaft 16 is rotated, the helical tooth 15 is driven to rotate, and the helical tooth 15 drives the worm wheel 8 to rotate. Under the action of the pulley 10 and the belt 9, the one-way bearing is in a locked state at this time, driving the first gear 12 to rotate, thereby driving the first rack 11 to move. When the first motor 7 stops rotating, under the action of gravity, the first rack 11 moves downward, the one-way bearing is in a free rotation state, and the first gear 12 is idling.
[0040] When in use, the mask is placed on the rubber block 4, and the second motor 18 is rotated to clamp the mask by the two fixed plates 17, and then the first motor 7 is rotated, and the rotation of the first motor 7 drives the rotating shaft 16 to rotate, and the rotating shaft 16 drives the incomplete gear 28 to rotate, and the incomplete gear 28 is engaged with the third gear 27 on the first threaded sleeve 35. The first threaded sleeve 35 rotates, which will drive the fixed plate 25 to rise, thereby causing the clamped mask to rise. At the same time, when the fixed plate 25 rises, it will drive the connecting block 31 to rise, and the connecting block 31 drives the abutment block 30 to rise, thereby driving the second rack 24 to move together, and the incomplete gear 28 is engaged with the third gear 27 on the second threaded sleeve 35, driving the second threaded sleeve 35 to rotate, thereby driving the second reciprocating threaded rod 26 to move upward. The second gear 23 is lifted up, so that the second reciprocating threaded rod 26 pushes the second rack 24 to move upward. At this time, the one-way bearing is in a locked state, driving the second gear 23 to rotate, thereby driving the rotating rod 22 to rotate, driving the mask to rotate 180°, and turning the mask over. After the turning over is completed, the second reciprocating threaded rod 26 moves reciprocatingly downward. Since the second gear 23 is a one-way bearing, it is in a free rotation state at this time. Under the action of gravity, the second rack 24 will drive the second gear 23 to idle. The second rack 24 descends, so that the abutment block 30 abuts against the connecting block 31 again, and then the incomplete gear 28 re-engages with the third gear 27 on the first threaded sleeve 35, thereby driving the fixed plate 25 to descend, placing the mask on the rubber block 4, and the second motor 18 reverses to release the mask, and the conveyor belt 3 conveys the turned mask away;
[0041] When the mask is turned over, the spiral teeth 15 are driven to rotate, and the spiral teeth 15 drive the worm wheel 8 to rotate. Under the action of the pulley 10 and the belt 9, the one-way bearing is locked at this time, and the first gear 12 is driven to rotate, thereby driving the first rack 11 to move. The first rack 11 moves upward, compresses the air in the connecting shell 14, and the air blows the push block 38 upward, inserts the rod 37 into the teeth of the second gear 13, fixes the second gear 13, and thus fixes the conveyor belt 3. After the turning over stops, under the action of gravity, the rod 37 moves downward, releases the limit fixation of the second gear 13, and allows the conveyor belt 3 to move again to transport the mask, so that the conveyor belt 3 stops moving when the mask is turned over, and moves after the end.
[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A sterilization device for mask production, comprising a base (1), characterized in that: A conveyor belt (3) is installed on the base (1); a support frame (5) fixedly connected to the base (1) is arranged above the conveyor belt (3); and a plurality of ultraviolet lamps (6) are arranged at equal distances on the support frame (5); A plurality of rubber blocks (4) are fixedly connected to the conveyor belt (3), and the rubber blocks (4) are used for placing masks; The base (1) is fixedly connected to a support seat (29), the support seat (29) is connected to a fixed plate (25) via an anti-wrinkle mechanism, the fixed plate (25) is rotatably connected to a rotating rod (22) via a bearing, the rotating rod (22) is rotatably connected to a second gear (23) via a one-way bearing, the second gear (23) is meshed with a second rack (24), the second rack (24) is driven by the anti-wrinkle mechanism, the rotating rod (22) is fixedly connected to a fixed frame (19), and the fixed frame (19) is provided with a clamping mechanism for a mask.
2. A sterilization device for mask production according to claim 1, characterized in that: The anti-wrinkle mechanism comprises two threaded sleeves (35), the two threaded sleeves (35) are rotatably connected to the support seat (29) through bearings, and the two threaded sleeves (35) are both threadedly connected with reciprocating threaded rods (26), one of the reciprocating threaded rods (26) is fixedly connected with a fixed plate (25), and the other reciprocating threaded rod (26) is located directly below the second rack (24), the two reciprocating threaded rods (26) are positioned by a positioning mechanism, and the two threaded sleeves (35) are driven by a selection mechanism, a connecting block (31) is fixedly connected to the fixing plate (25), and an abutting block (30) is fixedly connected to the second rack (24), and the abutting block (30) is located directly above the connecting block (31), and the second rack (24) is limited by a limiting mechanism.
3. A sterilization device for mask production according to claim 2, characterized in that: The positioning mechanism comprises an anti-rotation sleeve (40), the anti-rotation sleeve (40) is fixedly connected to the support seat (29), an anti-rotation rod (34) can be inserted into the anti-rotation sleeve (40), and the anti-rotation rod (34) is fixedly connected to the reciprocating threaded rod (26).
4. A sterilization device for mask production according to claim 2, characterized in that: The selection mechanism comprises a third gear (27), the two threaded sleeves (35) are both fixedly connected to the third gear (27), the base (1) is mounted with a first motor (7), the first motor (7) is transmission-connected to a rotating shaft (16), the rotating shaft (16) is fixedly connected to an incomplete gear (28), and the incomplete gear (28) is meshed with the third gear (27).
5. A sterilization device for mask production according to claim 4, characterized in that: The limiting mechanism comprises a limiting rod (33), the limiting rod (33) is fixedly connected to the fixing plate (25), a connecting sleeve (32) is fixedly connected to the second rack (24), and the limiting rod (33) passes through the connecting sleeve (32).
6. A sterilization device for mask production according to claim 5, characterized in that: A second gear (13) is fixedly connected to the main rotating roller of the conveyor belt (3), a sliding sleeve (36) is fixedly connected to the base (1), an insertion rod (37) is slidably arranged in the sliding sleeve (36), one end of the insertion rod (37) can be inserted into the teeth of the second gear (13), and the other end is fixedly connected to a pushing block (38), a connecting shell (14) is fixedly connected to the base (1), an air outlet of the connecting shell (14) is located directly below the pushing block (38), a piston (39) is abutted in the connecting shell (14), a first rack (11) is fixedly connected to the piston (39), and the first rack (11) is transmission-connected to the rotating shaft (16) through a connecting mechanism.
7. A sterilization device for mask production according to claim 6, characterized in that: The connecting mechanism comprises a helical tooth (15), wherein the helical tooth (15) is fixedly connected to the rotating shaft (16); two pulleys (10) are rotatably connected to the base (1) via a bearing; a belt (9) is sleeved between the two pulleys (10); one of the pulleys (10) is rotatably connected to a first gear (12) via a one-way bearing; the first gear (12) is meshed with the first rack (11); and a worm wheel (8) is fixedly connected to the other pulley (10); the worm wheel (8) is meshed with the helical tooth (15).
8. A sterilization device for mask production according to claim 1, characterized in that: The clamping mechanism comprises a second motor (18), the second motor (18) is mounted on a fixing frame (19), the fixing frame (19) is rotatably connected to a bidirectional threaded rod (20) via a bearing, the bidirectional threaded rod (20) is threadedly connected to two fixing plates (17), the two fixing plates (17) are penetrated by positioning columns (21), the positioning columns (21) are fixedly connected to the fixing frame (19), and a controller for controlling the second motor (18) is mounted on the fixing frame (19).