Adjusting and fixing device for motor installation
By designing the fastening clamp positioning and heat dissipation functions in the motor installation and adjustment fixture, the problem of motor shaking when moving is solved, the stability and service life are improved, and the maintenance process is simplified, and it is suitable for motors of various sizes.
Patent Information
- Application Number
- CN202411114421.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2024-12-31
AI Technical Summary
The existing motor installation and adjustment fixtures lack a stable structure when the motor moves horizontally, causing the motor to shake and affect the use effect.
An adjustment fixing device including a fixing base, connecting plate, adjustment assembly and positioning assembly is designed. The positioning plate is moved by rotating the handle wheel and screw, and the guide slider is used to achieve fastening and clamping positioning, combining the protective unit and heat dissipation. Unit that provides stability and noise reduction.
Effectively prevent motor shaking, improve stability and service life, it is suitable for motors of different sizes, simplify maintenance and maintenance processes, improve work efficiency and noise reduction.
Smart Images

Figure CN119231828A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electric motors, and in particular to an adjusting and fixing device for installing an electric motor. Background Art
[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. It converts electrical energy into mechanical energy and generates driving torque through internal electromagnetic action. The main function of an electric motor is to serve as a power source for electrical appliances or various machines. It is widely used in various fields such as industry, transportation, and household appliances. It is an indispensable and important equipment in modern society.
[0003] Patent document CN213072324U discloses an adjustment and fixing device for motor installation, including a fixing plate and a mounting plate, a plurality of guides are arranged between the fixing plate and the fixing plate; a telescopic device is installed between the fixing plate and the mounting plate; a plurality of fixing holes are arranged side by side on the side of the support column; a notch is arranged at the upper end of the telescopic guide sleeve; a first rectangular plate is arranged on both sides of the notch; a limiting column is fixed on the first rectangular plate; a limiting plate is fixed on the end side of the limiting column; a fixer is installed in the middle of the limiting column; a reset spring is installed between the fixer and the limiting plate. The adjustment and fixing device realizes guidance by setting a guide, enables the mounting plate to move up and down by setting a telescopic device, and fixes the mounting plate by setting a fixer to cooperate with the fixing hole. The adjustment and fixing device can adjust the height of the motor, is suitable for different environments and different devices, and expands the scope of use.
[0004] However, the device still has the following problems: when the motor base drives the motor to move horizontally, due to the lack of a stable structural design, the motor is prone to shaking when moving, which affects the use effect of the motor to a certain extent.
[0005] In order to solve this problem, a positioning structure with strong practicality and easy operation is designed. By rotating the two hand-tightening screws, the two positioning plates can be moved under the action of the two hand-tightening screws. At the same time, with the help of the guiding effect of the guide slide bar, the two positioning plates can be brought close to each other, thereby fastening and clamping the two sides of the motor to position, which can effectively prevent the motor from shaking when moving, and it is very necessary to have an adjustment and fixing device for motor installation to improve the stability and reliability of the motor. Summary of the invention
[0006] The object of the present invention is to provide an adjusting and fixing device for installing a motor to solve the problems raised in the above background technology.
[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an adjustment and fixing device for installing a motor, comprising a fixed base, the left and right sides of which are provided with connecting plates, and the surfaces of the connecting plates are provided with fastening screws; a motor is installed at the upper end of the fixed base, and an adjustment component is designed on the top surface of the fixed base, and at the same time, a positioning component is also provided on the top surface of the fixed base; the adjustment component is composed of adjustment units, and these adjustment units are respectively arranged on the left and right ends of the fixed base, and a slide groove is also opened on the top surface of the fixed base, and a moving unit is installed inside the slide groove; the positioning The component consists of a protective shell and a connecting base plate. The bottom surface of the protective shell is fixedly connected to the top surface of the connecting base plate. A positioning unit, a heat dissipation unit and a protective unit are arranged inside the protective shell. The positioning unit is arranged at the upper end of the protective unit, and the heat dissipation unit is arranged at the rear end of the protective shell. The protective unit includes a protective pad. A supporting arm is arranged on the surface of the protective pad. One connecting surface of the supporting arm is fixedly connected to the surface of the protective pad, and the other connecting surface is fixedly connected to the inner wall of the protective shell. A noise reduction plate is also arranged at the lower end of the protective pad, and the surface of the noise reduction plate is also fixedly connected to the inner wall of the protective shell.
[0008] According to the above technical solution, the movable unit is mainly composed of a movable slider, the bottom surface of which is slidably connected to the inner wall of a slide groove opened on the top surface of a fixed base, the top surface of the movable slider is provided with a bottom plate, and the top surface of the movable slider is fixedly connected to the bottom surface of the bottom plate, and a threaded hole is also opened on the inner wall of the movable slider, so that the surface of the first screw can be threadedly connected to the inner wall of the threaded hole.
[0009] According to the above technical solution, the left side of the first screw is rotationally connected to the inner wall of the slide groove, and the right side thereof rotatably penetrates the inner wall of the slide groove and extends to the right end of the fixed base. A handle wheel is fixedly arranged on the right side of the first screw, and a handle is fixedly arranged on the right side of the handle wheel for easy operation. The inner wall of the movable slider is slidingly connected to the guide slide, and the left and right sides of the guide slide are fixedly connected to the inner wall of the slide groove, thereby ensuring the stability of the movable slider during the sliding process.
[0010] According to the above technical solution, a fixing part is provided on the top surface of the base plate. This design enables the bottom surface of the base plate to be fastened to the bottom plate through the fixing part, and the top surface of the base plate is also fixedly connected to the bottom surface of the protective shell. Such a structural design ensures the overall stability and firmness.
[0011] According to the above technical solution, the positioning unit is mainly composed of a positioning plate, and an anti-slip pad is arranged on the surface of the positioning plate. The connecting surface of the anti-slip pad is fixed to the surface of the positioning plate by bonding, and the other connecting surface of the positioning plate is provided with an axle seat, and the connecting surface of the axle seat is fixedly connected to the other connecting surface of the positioning plate. A second screw is installed at the other end of the axle seat, and the connecting surface of the second screw is rotatably connected to the other connecting surface of the bearing. The other connecting surface of the second screw rotatably penetrates the inner wall of the protective shell and extends to the outer end of the protective shell, and a rotating handle wheel is fixedly arranged on the end surface.
[0012] According to the above technical solution, a guide slide rod is provided on the other connecting surface of the positioning plate, and the connecting surface of the guide slide rod is fixedly connected to the other connecting surface of the positioning plate, and the other connecting surface of the guide slide rod slides through the inner wall of the protective shell and extends to the outer end of the protective shell. In order to ensure the stability of the guide slide rod during the sliding process, a limiting block is provided on its other connecting surface, and the connecting surface of the limiting block is fixedly connected to the other connecting surface of the guide slide rod, thereby ensuring that the positioning plate can move stably along the guide slide rod, and the limiting block prevents the guide slide rod from falling off.
[0013] According to the above technical scheme, the heat dissipation unit is mainly composed of a ventilation pipe, a through groove is opened on the inner wall of the protective shell, and the surface of the ventilation pipe is slidably connected to the inner wall of the through groove, and a mounting plate is provided on the bottom surface of the ventilation pipe, and the back of the mounting plate is fixedly connected to the front of the ventilation pipe, and a fixing bolt is provided on the surface of the mounting plate, and the mounting plate and the protective shell are fastened together by the fixing bolt. A filter is also provided on the rear end inner wall of the ventilation pipe, and the surface of the filter is fixedly connected to the rear end inner wall of the ventilation pipe to effectively prevent dust from entering, and a heat exhaust fan is provided on the front end inner wall of the ventilation pipe, and the surface of the heat exhaust fan is also fixedly connected to the front end inner wall of the ventilation pipe, providing effective heat dissipation function for the equipment.
[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: 1) The present invention, by cleverly arranging a noise reduction pad on the inner wall of the protective shell, effectively reduces the noise generated by the motor during operation, creating a quieter working environment for the user. At the same time, the provision of the protective pad also plays a vital role. It can effectively prevent the wear of the bottom surface of the motor during operation, providing a solid layer of protection for the motor, thereby significantly improving the service life and working efficiency of the motor.
[0015] 2) In the present invention, by rotating the two first screws, the two positioning plates can be moved under the action of the two first screws. Under the guidance of the guide slide rod, the two positioning plates can be brought close to each other, so as to clamp and position the two sides of the motor. This design not only effectively prevents the motor from shaking when moving, but also makes the motor seat suitable for motors of various sizes, meeting the diverse needs of the motor during operation.
[0016] 3) In the present invention, when the motor needs to be taken out for maintenance and overhaul, it is only necessary to rotate the handle wheel in the opposite direction so that the two sets of second screws drive the two sets of positioning plates away from the motor, and the motor is no longer positioned and clamped. Afterwards, the protective cover can be easily opened through the handle groove provided on the top surface of the protective cover, and the motor can be taken out from the protective shell. The whole operation process is simple and quick, which greatly improves work efficiency.
[0017] 4) The present invention, by specially providing a positioning plate and pasting an anti-skid pad on the surface of the positioning plate, this design effectively prevents the motor from being offset during operation, thereby ensuring the firmness and stability of the motor during operation.
[0018] 5) The present invention effectively dissipates the heat generated by the motor during operation by starting two sets of heat exhaust fans inside the ventilation duct, which not only improves the working efficiency of the motor but also significantly prolongs the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.
[0020] In the attached picture: Figure 1 It is a schematic diagram of an overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of an overall side three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of a front three-dimensional structure of the protective case of the present invention; Figure 4 It is a top view of a three-dimensional structure of the protective shell of the present invention; Figure 5 The present invention Figure 4 An enlarged view of a local structure at point A in the middle.
[0021] In the figure: 1 fixed base, 2 connecting plate, 3 fastening screw, 4 motor, 5 adjustment component, 51 adjustment unit, 52 moving unit, 501 first screw, 502 handle wheel, 503 handle, 504 moving slider, 505 guide slide, 506 bottom plate, 6 positioning component, 61 positioning unit, 62 heat dissipation unit, 63 protection unit, 601 protection shell, 602 connecting bottom plate, 603 fixing part, 604 protection cover, 605 rotating handle wheel, 606 second screw, 607 positioning plate, 608 guide slide, 609 supporting arm, 610 protection pad, 611 ventilation pipe, 612 mounting plate, 613 filter, 614 heat exhaust fan. DETAILED DESCRIPTION
[0022] 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. Embodiment 1
[0023] Combination Figure 1 - Figure 5, an adjustment and fixing device for installing a motor, comprising a fixed base 1, a connecting plate 2 is arranged on the left and right sides of the base, and a fastening screw 3 is provided on the surface of the connecting plate 2 for fixing; a motor 4 is installed at the upper end of the fixed base 1, and an adjustment component 5 and a positioning component 6 are specially designed on the top surface of the fixed base 1. The core of the adjustment component 5 is an adjustment unit 51, which are cleverly arranged on the left and right ends of the fixed base 1. A slide groove is also provided on the top surface of the fixed base 1, and a moving unit 52 is installed inside the slide groove. The moving unit 52 is mainly composed of a moving slider 504, and the bottom surface of the moving slider 504 is slidably connected to the inner wall of the slide groove so that it can move freely in the slide groove. The top surface of the moving slider 504 is fixedly connected to the bottom plate 506, and the inner wall of the moving slider 504 is also provided with a threaded hole, which is connected to the surface of the first screw 501 The threads on the surfaces match to achieve a threaded connection. The left side of the first screw 501 is rotatably connected to the inner wall of the slide groove, while the right side thereof rotatably penetrates the inner wall of the slide groove and extends to the right end of the fixed base 1. A handle wheel 502 is also fixedly provided on the right side of the first screw 501, and a handle 503 is fixedly provided on the right side of the handle wheel 502 for easy operation. In order to ensure the stability of the movable slider 504 during the sliding process, the inner wall of the movable slider 504 is also slidably connected to the guide slide 505. The left and right sides of the guide slide 505 are fixedly connected to the inner wall of the slide groove. A fixing part 603 is also provided on the top surface of the bottom plate 506. This design enables the bottom surface of the connecting bottom plate 602 and the bottom plate 506 to be fastened together through the fixing part 603, and the top surface of the connecting bottom plate 602 is also fixedly connected to the bottom surface of the protective shell 601.
[0024] When it is necessary to adjust the lateral movement of the motor 4, just hold the handle 503 and turn the handle wheel 502, the handle wheel 502 will drive the threaded rod 501 to rotate, and since the movable slider 504 is threadedly connected to the threaded rod 501, the movable slider 504 will move left and right inside the slide groove opened on the top surface of the fixed base 1, and under the guidance of the guide slide 505, the movable slider 504 will drive the bottom plate 506 to move, thereby further driving the motor 4 that is tightly clamped inside the protective shell 601 to adjust the position in the lateral left and right directions. This design makes the position adjustment of the motor simple and accurate. Embodiment 2
[0025] See also Figure 1 - Figure 5, and on the basis of the first embodiment, it is further obtained that the positioning component 6 includes a protective shell 601 and a connecting bottom plate 602, the bottom surface of the protective shell 601 is fixedly connected to the top surface of the connecting bottom plate 602 to ensure the stability of the structure, and a positioning unit 61, a heat dissipation unit 62 and a protective unit 63 are designed inside the protective shell 601 to meet various needs of the motor 4 during use. The positioning unit 61 is cleverly arranged at the upper end of the protective unit 63, and is mainly composed of a positioning plate 607. The surface of the positioning plate 607 is pasted with an anti-slip pad. This design effectively prevents the motor 4 from deflecting during operation and improves the stability of the motor 4. In order to ensure stability, an axle seat is arranged on the other connecting surface of the positioning plate 607, and the other end of the axle seat is connected to a second screw rod 606. The other end of the second screw rod 606 rotatably penetrates the inner wall of the protective shell 601 and extends to the outer end of the protective shell 601, and a rotating handle wheel 605 is fixedly arranged on its end surface for easy operation. A guide slide rod 608 is also arranged on the other connecting surface of the positioning plate 607, and the other end of the guide slide rod 608 also slides through the inner wall of the protective shell 601 and extends to the outer end of the protective shell 601. On the other connecting surface of the guide slide rod 608, a limiting block is also arranged to prevent the guide slide rod 608 from falling off during the sliding process.
[0026] When it is necessary to position motors 4 of different sizes, it is only necessary to rotate the two rotating handle wheels 605, and the two positioning plates 607 will move under the action of the rotating handle wheels 605. Under the guiding action of the guide slide bar 608, the two positioning plates 607 will move closer to each other, thereby fastening and clamping the two sides of the motor 4 to position them, so that the motor fixing base can be suitable for motors 4 of various sizes, meeting the diverse needs of the motor 4 during work. The protection unit 63 is mainly responsible for protecting the bottom surface of the motor 4 and reducing noise. It is mainly composed of a protection pad 610. A supporting arm 609 is provided on the surface of the protection pad 610. The other connecting surface of the supporting arm 609 is fixedly connected to the inner wall of the protective shell 601. At the lower end of the protection pad 610, a noise reduction plate is provided. The surface of the noise reduction plate is also fixedly connected to the inner wall of the protective shell 601. This design not only effectively prevents the bottom surface of the motor 4 from The wear and tear generated during operation also plays a certain protective role on the motor 4, thereby improving the service life and working efficiency of the motor 4. The setting of the noise reduction plate also effectively reduces the noise generated by the motor 4 during operation. The heat dissipation unit 62 is responsible for dissipating the heat generated by the motor 4 during operation, and is mainly composed of a ventilation pipe 611. A mounting plate 612 is set on the bottom surface of the ventilation pipe 611, and the back of the mounting plate 612 is fixedly connected to the front of the ventilation pipe 611. A fixing bolt is also set on the surface of the mounting plate 612, and the mounting plate 612 is fastened to the protective shell 601 through the fixing bolt. A filter screen 613 is set on the inner wall of the rear end of the ventilation pipe 611 to prevent dust from entering. A heat exhaust fan 614 is set on the inner wall of the front end of the ventilation pipe 611 to effectively dissipate the heat generated by the motor 4. This design not only improves the working efficiency of the motor 4, but also extends the service life of the motor 4.
[0027] When the motor 4 needs to be maintained and repaired, it is only necessary to rotate the handle wheel 605 in the opposite direction so that the two sets of second screws 606 drive the two sets of positioning plates 607 away from the motor 4. The motor 4 is no longer positioned and clamped. The protective cover 604 is opened through the handle groove on the top surface of the protective cover 604, and the motor 4 can be easily taken out of the protective shell 601 for maintenance and repair. The whole operation process is simple and convenient, which greatly improves work efficiency.
[0028] Working principle: First, the fixed base 1 is fixed in the designated position through the bolt holes opened on the connecting plate 2 and the top surface thereof, and fastened with the fastening screws 3. Then the motor 4 is carefully placed on the protective pad 610 inside the protective shell 601. Then, by rotating the two rotating handle wheels 605, the two positioning plates 607 can be driven to move under the action of the second screw 606. Under the guidance of the guide slide bar 608, the two positioning plates 607 will move closer to each other, thereby fastening and clamping the two sides of the motor 4. The anti-slip pad design pasted on the surface of the positioning plate 607 can effectively prevent the motor 4 from deviating during operation, thereby ensuring the stability of the motor 4.
[0029] When the motor 4 is operating, starting the two sets of heat exhaust fans 614 inside the ventilation duct 611 can effectively dissipate the heat generated by the motor 4 during operation, ensuring the working efficiency and service life of the motor 4. At the same time, the setting of the noise reduction pad can also effectively reduce the noise generated by the motor 4 during operation, providing a quieter working environment.
[0030] If the motor 4 needs to be adjusted for lateral movement, the handle 503 can be held and the handle wheel 502 can be turned. The rotation of the handle wheel 502 will drive the threaded rod 501 to rotate, so that the movable slider 504 threadedly connected to the threaded rod 501 can move left and right inside the slide groove opened on the top surface of the fixed base 1. Under the guidance of the guide slide 505, the movable slider 504 will drive the bottom plate 506 to move, and then drive the motor 4 clamped inside the protective shell 601 to adjust the position in the lateral left and right directions, so as to flexibly adjust the position of the motor 4.
[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An adjusting and fixing device for installing a motor, comprising a fixing base (1), a connecting plate (2) being arranged on the left and right sides of the base, and a fastening screw (3) being arranged on the surface of the connecting plate (2); a motor (4) being installed on the upper end of the fixing base (1), characterized in that: An adjustment component (5) and a positioning component (6) are provided on the top surface of the fixed base (1); The adjustment assembly (5) is composed of adjustment units (51), which are respectively arranged at the left and right ends of the fixed base (1). A slide groove is also provided on the top surface of the fixed base (1), and a moving unit (52) is installed inside the slide groove. The positioning assembly (6) is composed of a protective shell (601) and a connecting bottom plate (602); the bottom surface of the protective shell (601) is fixedly connected to the top surface of the connecting bottom plate (602); and a positioning unit (61), a heat dissipation unit (62) and a protection unit (63) are arranged inside the protective shell (601); The positioning unit (61) is arranged at the upper end of the protection unit (63), and the heat dissipation unit (62) is arranged at the rear end of the protection shell (601); The protection unit (63) comprises a protection pad (610), a support arm (609) being arranged on the surface of the protection pad (610), one connection surface of the support arm (609) being fixedly connected to the surface of the protection pad (610), and the other connection surface being fixedly connected to the inner wall of the protection shell (601), and a noise reduction plate being arranged at the lower end of the protection pad (610), the surface of the noise reduction plate being fixedly connected to the inner wall of the protection shell (601).
2. The adjusting and fixing device for motor installation according to claim 1, characterized in that: The movable unit (52) is mainly composed of a movable slider (504), the bottom surface of which is slidably connected to the inner wall of a slide groove provided on the top surface of the fixed base (1), the top surface of the movable slider (504) is provided with a bottom plate (506), and the top surface of the movable slider (504) is fixedly connected to the bottom surface of the bottom plate (506), and the inner wall of the movable slider (504) is also provided with a threaded hole, so that the surface of the first screw rod (501) can be threadedly connected to the inner wall of the threaded hole.
3. The adjusting and fixing device for motor installation according to claim 2, characterized in that: The left side of the first screw rod (501) is rotatably connected to the inner wall of the slide groove, while the right side thereof rotatably penetrates the inner wall of the slide groove and extends to the right end of the fixed base (1). A handle wheel (502) is fixedly arranged on the right side of the first screw rod (501), and a handle (503) is fixedly arranged on the right side of the handle wheel (502); the inner wall of the movable slider (504) is slidably connected to the guide slideway (505), and the left and right sides of the guide slideway (505) are fixedly connected to the inner wall of the slide groove.
4. The adjusting and fixing device for motor installation according to claim 3, characterized in that: The top surface of the bottom plate (506) is provided with a fixing piece (603), the bottom surface of the connecting bottom plate (602) and the bottom plate (506) are fastened together via the fixing piece (603), and the top surface of the connecting bottom plate (602) and the bottom surface of the protective shell (601) are also fastened together via the fixing piece (603).
5. The adjusting and fixing device for motor installation according to claim 4, characterized in that: The positioning unit (61) is mainly composed of a positioning plate (607), the surface of the positioning plate (607) is provided with an anti-skid pad, the connecting surface of the anti-skid pad is fixed to the surface of the positioning plate (607) by bonding, the other connecting surface of the positioning plate (607) is provided with an axle seat, the connecting surface of the axle seat is fixedly connected to the other connecting surface of the positioning plate (607), the other end of the axle seat is installed with a second screw rod (606), the connecting surface of the second screw rod (606) is rotatably connected to the other connecting surface of the bearing, the other connecting surface of the second screw rod (606) rotatably penetrates the inner wall of the protective shell (601) and extends to the outer end of the protective shell (601), and a rotating handle wheel (605) is provided on the end surface.
6. The adjusting and fixing device for motor installation according to claim 5, characterized in that: A guide slide bar (608) is provided on the other connecting surface of the positioning plate (607), and the connecting surface of the guide slide bar (608) is fixedly connected to the other connecting surface of the positioning plate (607). The other connecting surface of the guide slide bar (608) slides through the inner wall of the protective shell (601) and extends to the outer end of the protective shell (601). A limiting block is provided on the other connecting surface of the guide slide bar (608), and the connecting surface of the limiting block is fixedly connected to the other connecting surface of the guide slide bar (608). The positioning plate (607) can move along the guide slide bar (608).
7. The adjusting and fixing device for motor installation according to claim 6, characterized in that: The heat dissipation unit (62) is mainly composed of a ventilation pipe (611). A through groove is provided on the inner wall of the protective shell (601). The surface of the ventilation pipe (611) is slidably connected to the inner wall of the through groove. A mounting plate (612) is provided on the bottom surface of the ventilation pipe (611). The rear surface of the mounting plate (612) is fixedly connected to the front surface of the ventilation pipe (611). A fixing bolt is provided on the surface of the mounting plate (612). The mounting plate (612) is fastened to the protective shell (601) via the fixing bolt. A filter screen (613) is also provided on the rear inner wall of the ventilation pipe (611). The surface of the filter screen (613) is fixedly connected to the rear inner wall of the ventilation pipe (611). A heat exhaust fan (614) is provided on the front inner wall of the ventilation pipe (611). The surface of the heat exhaust fan (614) is fixedly connected to the front inner wall of the ventilation pipe (611).
