CN217632999U

CN217632999U - Fire control is low noise high temperature resistant mixed flow fan for smoke exhaust

Info

Publication number: CN217632999U
Application number: CN202221779412.6U
Authority: CN
Inventors: 郝战京; 史世强
Original assignee: Henan Ruitai Hvac Technology Co ltd
Current assignee: Henan Ruitai Hvac Technology Co ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-10-21
Anticipated expiration: 2032-07-11

Abstract

The utility model discloses a fire control smoke exhaust is with mixed flow fan of low noise high temperature resistance, including shell, birotor motor, forward blade, reverse blade, thermal-insulated case and bellows, the birotor motor is installed in the thermal-insulated case, reverse blade installs on one end of birotor motor and is located the thermal-insulated case, forward blade installs on the other end of birotor motor and is located outside the thermal-insulated case, the thermal-insulated case is installed in the shell, the side of thermal-insulated case is provided with the air-supply line, be provided with the air-out pipe rather than the intercommunication on the thermal-insulated case, the air-out pipe passes shell and bellows and communicates with the external world; separate the temperature box and be provided with the cavity intermediate layer, cavity intermediate layer intercommunication has emergent water cooling mechanism, is provided with between shell and the bellows and inhales the sound casing, and the shell is installed in inhaling the sound casing through taut fixed establishment, inhales the sound casing and passes through the damping damper and install in bellows. The mixed flow fan can effectively reduce noise pollution, reduce the working temperature of the motor and improve the safety and reliability of the mixed flow fan for fire fighting.

Description

Fire control is low noise high temperature resistant mixed flow fan for smoke exhaust

Technical Field

The utility model relates to a fire control high temperature smoke exhaust equipment technical field, concretely relates to fire control is low noise high temperature resistance mixed flow fan for smoke exhaust.

Background

The mixed flow fan is a fan between the axial flow fan and the centrifugal fan, the impeller of the mixed flow fan enables air to do centrifugal motion and axial motion, and the motion of the air in the shell mixes the two motion forms of axial flow and centrifugation, so that the mixed flow fan is called mixed flow. The mixed flow (oblique flow) fan has higher wind pressure coefficient than axial flow fan and larger flow coefficient than centrifugal fan, and is used in the place where both wind pressure and flow are not small. The fan fills the gap between the axial flow fan and the centrifugal fan. Meanwhile, the device has the characteristics of simplicity and convenience in installation. The fan mainly comprises an impeller, a shell, an inlet collector, a flow deflector, a motor and the like. The impeller is welded on the hub by adopting a twisted flat plate with meridian acceleration characteristics. The air-permeable and air-permeable combined type smoke exhaust ventilator is widely used for ventilation and fire-fighting high-temperature smoke exhaust in places such as tunnels, underground garages, high-grade civil buildings, metallurgy, factories and mines.

As is well known, when smoke exhaust fan is used for fire control to discharge fume, install at fire control air pipe middle part or pipeline tail end, produce the negative pressure and take away the flue gas, the operating temperature in the face of is tens degrees centigrade to hundreds of degrees centigrade, it is big to require the fan must possess the amount of wind, high temperature resistant and equipment operation stable characteristics and function to guarantee the fail safe nature of fan equipment in fire control high temperature work of discharging fume, when the mixed flow fan moves simultaneously, self vibrations, the granule striking in the air current impact or the flue gas can produce very big noise, cause noise pollution. And traditional mixed flow fan is that motor drive impeller operates, produces the amount of wind, but the motor can direct contact/indirect face high temperature environment, self heat extraction or heat dissipation are not sufficient enough, and long-time operation is damaged by high temperature easily, breaks down in the equipment, in case shut down, will influence fire control work, threatens people's security of lives and property.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire control smoke exhaust is with low noise high temperature resistant mixed flow fan to solve the mixed flow fan when the fire control is discharged fume, the noise is big, and the motor can direct contact/indirect to high temperature environment, self heat extraction or heat dissipation are abundant inadequately, and long-time operation is damaged by high temperature easily, the problem of equipment trouble appears.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a fire control smoke exhaust is with low noise high temperature resistance mixed flow fan, includes shell, birotor motor, forward blade, reverse blade, separates warm box and bellows, the birotor motor is installed separate the warm box in, reverse blade is installed one of birotor motor is served and is located separate the warm box in, forward blade is installed on the other end of birotor motor and is located outside separating the warm box, separate the warm box and install in the shell, the shell is installed in the bellows, the side of separating the warm box is provided with just to the air-supply line of reverse blade, the air-supply line passes the shell with bellows and external intercommunication, be provided with the play tuber pipe rather than the intercommunication on separating the warm box, the play tuber pipe passes the shell with bellows and external intercommunication, separate the warm box and be provided with the cavity intermediate layer, the cavity intermediate layer intercommunication has emergent water cooling mechanism; wherein the content of the first and second substances,

the shell with be provided with between the bellows and inhale the sound casing, the shell is installed through taut fixed establishment inhale in the sound casing, it installs through the damping damper to inhale the sound casing in the bellows, taut fixed establishment includes rings, wire rope and ropewinder, and is a plurality of rings evenly set up on the outer wall of shell, ropewinder evenly sets up inhale on the outer wall of sound casing, just ropewinder with rings set up relatively, wire rope's one end is fixed on rings, its other end with ropewinder's roll-up end is connected.

The further technical scheme is as follows: emergent water-cooling mechanism includes heat exchanger, coolant liquid storage tank, circulating pump and temperature sensor, the heat exchanger the coolant liquid storage tank the circulating pump with the cavity intermediate layer of thermal-insulated case communicates in proper order and forms circulation route, temperature sensor installs the inboard of shell and with the circulating pump passes through the controller electricity and connects, the heat exchanger passes through electric valve and external water source intercommunication, just electric valve passes through controller control.

The further technical scheme is as follows: the cooling flow direction in the hollow interlayer of the heat insulation box is downward inlet and upward outlet, the liquid inlet end of the heat insulation box is close to the forward blades, and the liquid outlet end of the heat insulation box is far away from the forward blades.

The further technical scheme is as follows: and U-shaped cooling pipes which are uniformly distributed in an annular shape are arranged in the hollow interlayer of the heat insulation box, and two ends of each U-shaped cooling pipe are respectively communicated with the heat exchanger and the circulating pump.

The further technical scheme is as follows: the outer side surface of the U-shaped cooling pipe is provided with a spacer, and the inner side surfaces of the spacer and the heat insulation box are provided with heat insulation refractory cotton.

The further technical scheme is as follows: the air inlet pipe is provided with a filter screen. The air inlet pipe with the outer end of air-out pipe all is provided with the protection casing.

The further technical scheme is as follows: the rope winder comprises an installation box, a winding shaft and a rotating shaft, wherein the installation box is uniformly arranged on the outer wall of the sound-absorbing shell, the winding shaft and the rotating shaft are arranged in parallel and rotatably arranged in the installation box and meshed through gears, and one end of a steel wire rope is connected to the winding shaft.

Compared with the prior art, the utility model discloses can reach one of following beneficial effect at least:

the utility model provides a fire control is mixed flow fan of low noise high temperature resistance for exhaust, at equipment fan in-process, adopt taut fixed establishment will hold the shell of birotor motor and blade and fix to in inhaling the sound casing, the stay cord structure is on the source that the noise produced and the route of transmission, effectively subtract vibrations and the noise of following the solid propagation, in addition, vibrations and the noise that the part was transmitted away are weakened and are absorbed by the sound casing of inhaling that damping ware and sound absorbing material made respectively, reduce the noise pollution that mixed flow fan during operation produced.

Replace driving fan moving traditional motor for the birotor motor, and set up the insulating case outside the birotor motor, can effectively hinder external high temperature environment and transmit for the birotor motor, birotor motor one end in the insulating case sets up reverse blade simultaneously, when the birotor motor starts, reverse blade produces the external gas of negative pressure suction, take away the heat of birotor motor through external low temperature gas flow, a temperature for reducing the birotor motor, guarantee mixed flow fan's steady operation, improve the fail safe nature that the mixed flow fan is used for fire control work.

In addition, the limited closing temperature of a fire valve of a fire protection system is 70 ℃, the limited closing temperature of a smoke exhaust fire valve is 280 ℃, when the smoke temperature exceeds 70 ℃ and is lower than 280 ℃, the air cooling effect is not enough to cool the double-rotor motor to the safe temperature, an emergency water cooling mechanism is required to be utilized to reduce the internal temperature of the heat insulation box to be lower than the safe working temperature of the double-rotor motor, and the running safety of the mixed flow fan is ensured.

Drawings

Fig. 1 is the utility model relates to a fire control is low noise high temperature resistant mixed flow fan for smoke exhaust's structural schematic diagram.

Fig. 2 is a schematic view of another perspective view of the present invention shown in fig. 1.

Fig. 3 is a schematic structural view of the fastening mechanism of fig. 2 according to the present invention.

Fig. 4 is a schematic structural view of the incubator of fig. 1 according to the present invention.

Reference numerals are as follows: 1. a housing; 2. a dual rotor motor; 3. a forward blade; 4. a counter blade; 5. a heat insulation box; 6. an air box; 7. an air inlet pipe; 8. an air outlet pipe; 9. an emergency water cooling mechanism; 91. a heat exchanger; 92. a coolant reservoir; 93. a circulation pump; 94. a temperature sensor; 10. a U-shaped cooling tube; 11. a spacer; 12. heat-insulating refractory cotton; 13. a filter screen; 14. a protective cover; 15. a sound-absorbing housing; 16. tensioning the fixing mechanism; 161. a hoisting ring; 162. a wire rope; 163. a rope winder; 1631. installing a box; 1632. reeling a shaft; 1633. a rotating shaft; 17. a shock absorbing damper.

Detailed Description

To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which the products of the present invention are conventionally placed in use, or the position or positional relationship which the skilled person conventionally understand, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the reference is made must have a specific position, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

this embodiment is as shown in fig. 1 and fig. 2, a fire control is mixed flow fan for smoke abatement low noise high temperature resistance, the utility model discloses a structure as follows: the double-rotor motor 2 is arranged in the heat insulation box 5, the double-rotor motor 2 is provided with two rotors (rotating shafts), one rotating shaft penetrates out of the heat insulation box 5, the other rotating shaft is located in the heat insulation box 5, the reverse blade 4 is arranged at one end of the heat insulation box 5 on the double-rotor motor 2, the forward blade 3 is arranged at the other end of the double-rotor motor 2 and located outside the heat insulation box 5, the heat insulation box 5 is arranged in the shell 1, the shell 1 is arranged in the air box 6, an air inlet pipe 7 opposite to the reverse blade 4 is communicated with the side face of the heat insulation box 5, the air inlet pipe 7 penetrates through the shell 1 and the air box 6 to be communicated with the outside, an air outlet pipe 8 communicated with the heat insulation box 5 is arranged on the shell, and the air outlet pipe 8 penetrates through the shell 1 and the air box 6 to be communicated with the outside; the thermal insulation box 5 is provided with a hollow interlayer, the shell 1 and the thermal insulation box 5 are cylindrical, the hollow interlayer is communicated with an emergency water cooling mechanism 9, a sound absorption shell 15 is arranged between the shell 1 and the air box 6, the sound absorption shell 15 is cylindrical made of sound absorption materials, the shell 1 is installed in the sound absorption shell 15 through a tensioning fixing mechanism 16, the sound absorption shell 15 is installed in the air box 6 through at least three damping dampers 17, the tensioning fixing mechanism 16 comprises a hanging ring 161, a steel wire rope 162 and a rope winder 163, the hanging rings 161 are uniformly arranged on the outer wall of the shell 1, the rope winder 163 is uniformly arranged on the outer wall of the sound absorption shell 15, the rope winder 163 is arranged opposite to the hanging rings 161, one end of the steel wire rope 162 is fixed on the hanging rings 161, and the other end of the steel wire rope winder 163 is connected with a winding end of the rope winder 163.

The working process of the utility model is as follows: when the high-temperature flue gas exhaust device starts to work, a worker starts the double-rotor motor 2 to rotate through the controller, one rotating shaft of the double-rotor motor 2 drives the forward blades 3 to rotate, air volume for exhausting high-temperature flue gas is generated, meanwhile, the other rotating shaft drives the reverse blades 4 to generate negative pressure in the heat insulation box 5, external low-temperature gas is pumped in through the air inlet pipe 7, and heat of the double-rotor motor 2 is taken away from the heat insulation box 5 through the air outlet pipe 8. The heat insulation box 5 is arranged outside the double-rotor motor 2, so that the external high-temperature environment can be effectively prevented from being transmitted to the double-rotor motor 2; simultaneously the one end of birotor motor 2 in thermal-insulated case 5 sets up reverse blade 4, and when birotor motor 2 started, reverse blade 4 produced the negative pressure suction and is external gaseous, takes away the heat of birotor motor 2 through external low temperature gas flow, is used for reducing the temperature of birotor motor 2, guarantees the steady operation of mixed flow fan, improves the fail safe nature that the mixed flow fan is used for fire control work.

When the mixed flow fan works, because the vibrations that birotor motor 2 produced, the impact of air current and the striking of debris in the flue gas etc. factor, the mixed flow fan that all can be produces huge noise at the during operation, in the equipment fan in-process, adopt taut fixed establishment 16 will hold birotor motor 2, the shell 1 of forward blade 3 and reverse vane 4 is fixed to in inhaling the sound casing 15, the stay cord structure that taut fixed establishment 16 provided is in fixed shell 1, also can be on the source that the noise produced and the route of transmission, effectively reduce along the vibrations and the noise of solid propagation, in addition, vibrations and the noise that partial transmission was gone out are weakened and are absorbed by absorbing sound casing 15 that damping attenuator 17 and sound-absorbing material made respectively, reduce the noise pollution that the mixed flow fan during operation produced.

It is worth noting that the dust removing net inlet, the silencer and the like can be arranged at the air inlet end of the air box 6 to reduce noise pollution by preventing the impact of impurities in the flue gas and the noise generated by air flow impact.

In addition, it is known that: the limited closing temperature of a fire valve of a fire protection system is 70 ℃, the limited closing temperature of a smoke exhaust fire valve is 280 ℃, when the smoke temperature exceeds 70 ℃ and is lower than 280 ℃, the air cooling effect is not enough to cool the double-rotor motor 2 to the safe temperature, and the emergency water cooling mechanism 9 is required to be utilized to reduce the internal temperature of the heat insulation box 5 to be lower than the safe working temperature of the double-rotor motor 2, so that the running safety of the mixed flow fan is ensured.

Example two:

in the embodiment, the emergency water cooling mechanism 9 includes a heat exchanger 91, a coolant storage tank 92, a circulation pump 93 and a temperature sensor 94, the heat exchanger 91, the coolant storage tank 92, the circulation pump 93 and the hollow interlayers of the thermal insulation box 5 are sequentially communicated to form a circulation path, and the temperature sensor 94 is installed inside the housing 1 and electrically connected to the circulation pump 93 through a controller.

When the temperature of the flue gas in the shell 1 exceeds the safe working temperature of the dual-rotor motor 2, the temperature sensor 94 is triggered, the controller controls the circulating pump 93 to be started, the circulating passage is filled with cooling liquid and begins to be cooled, and the running temperature of the equipment is below the safe temperature by combining air cooling, so that the running safety and reliability of the mixed flow fan are ensured.

Preferably, the cooling flow direction in the hollow interlayer of the thermal insulation box 5 is downward inlet and upward outlet, the liquid inlet end of the thermal insulation box 5 is close to the forward blade 3, and the liquid outlet end of the thermal insulation box is far away from the forward blade 3.

The flowing direction of the cooling liquid in the hollow interlayer of the heat insulation box 5 is downward inlet and upward outlet, so that the cooling liquid can better and more sufficiently contact the heat insulation box 5 and effectively take away heat, the liquid inlet end of the heat insulation box 5 is close to the forward blade 3, and the liquid outlet end of the heat insulation box is far away from the forward blade 3, so that the temperature of the heat insulation box 5 with the highest temperature is reduced as soon as possible.

Preferably, the heat exchanger 91 is communicated with an external water source through an electrically operated valve, and the electrically operated valve is controlled by a controller.

Example three:

in this embodiment, as shown in fig. 4, U-shaped cooling pipes 10 are uniformly and annularly arranged in the hollow interlayer of the insulation box 5, and both ends of the U-shaped cooling pipe 10 are respectively communicated with the heat exchanger 91 and the circulating pump 93.

The U-shaped cooling pipe 10 is filled with cooling liquid to reduce the temperature of the heat insulation box 5, so that the cooling liquid is prevented from being filled into the heat insulation box 5, leakage is reduced, and disassembly and maintenance are facilitated.

Preferably, the outer side surface of the U-shaped cooling pipe 10 is provided with a spacer 11, and the inner side surfaces of the spacer 11 and the thermal insulation box 5 are provided with thermal insulation refractory cotton 12. Further improving the heat insulation and cooling effects on the heat insulation box 5

Preferably, the air inlet duct 7 is provided with a filter screen 13. And sundries are prevented from entering the heat insulation box 5 to damage the dual-rotor motor 2.

Preferably, the outer ends of the air inlet pipe 7 and the air outlet pipe 8 are provided with protective covers 14. The ventilation hood 14 prevents blockage of the air inlet pipe 7 and the air outlet pipe 8.

Example four:

in this embodiment, as shown in fig. 3, the rope winder 163 includes a mounting box 1631, a winding shaft 1632 and a rotating shaft 1633, the mounting box 1631 is uniformly disposed on the outer wall of the sound-absorbing casing 15, the winding shaft 1632 and the rotating shaft 1633 are disposed in parallel and rotatably mounted in the mounting box 1631, and through gear engagement, one end of the steel cable 162 is connected to the winding shaft 1632.

When the shell 1 is fixed by the tensioning fixing mechanism 16, the position of the shell 1 can be adjusted by tightening the steel wire rope 162 by using the rope winder 163, the air inlet end of the shell 1 is aligned with the air inlet end of the air box 6 as far as possible, and a person drives the winding shaft 1632 to rotate through the rotating shaft 1633 and the gear transmission structure, so that labor is saved, the gear transmission structure can be used for clamping, the winding shaft 1632 is prevented from being reversed, and the steel wire rope 162 is loosened.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. The utility model provides a fire control is low noise high temperature resistance mixed flow fan for smoke exhaust which characterized in that: the air cooling device comprises a shell (1), a double-rotor motor (2), forward blades (3), reverse blades (4), a heat insulation box (5) and an air box (6), wherein the double-rotor motor (2) is installed in the heat insulation box (5), the reverse blades (4) are installed at one end of the double-rotor motor (2) and are located in the heat insulation box (5), the forward blades (3) are installed at the other end of the double-rotor motor (2) and are located outside the heat insulation box (5), the heat insulation box (5) is installed in the shell (1), the shell (1) is installed in the air box (6), an air inlet pipe (7) for the reverse blades (4) is arranged on the side surface of the heat insulation box (5), the air inlet pipe (7) penetrates through the shell (1) and the air box (6) to be communicated with the outside, an air outlet pipe (8) communicated with the heat insulation box (5) is arranged on the heat insulation box (5), the air outlet pipe (8) penetrates through the shell (1) and the heat insulation box (6), and the water cooling interlayer communication mechanism is arranged between the water cooling box (5) and the interlayer; wherein the content of the first and second substances,

shell (1) with be provided with between bellows (6) and inhale sound casing (15), install shell (1) through taut fixed establishment (16) inhale in sound casing (15), it installs through damping damper (17) to inhale sound casing (15) in bellows (6), taut fixed establishment (16) are including rings (161), wire rope (162) and ropewinder (163), and are a plurality of rings (161) evenly set up on the outer wall of shell (1), ropewinder (163) evenly set up inhale on the outer wall of sound casing (15), just ropewinder (163) with rings (161) set up relatively, the one end of wire rope (162) is fixed on rings (161), its other end with the roll-up end of ropewinder (163) is connected.

2. The low-noise high-temperature-resistant mixed flow fan for fire fighting and smoke exhaust as claimed in claim 1, wherein: emergent water-cooling mechanism (9) include heat exchanger (91), coolant liquid storage tank (92), circulating pump (93) and temperature sensor (94), heat exchanger (91) coolant liquid storage tank (92) circulating pump (93) with the cavity intermediate layer of thermal-insulated case (5) communicates in proper order and forms circulation path, temperature sensor (94) are installed the inboard of shell (1) and with circulating pump (93) are connected through the controller electricity, heat exchanger (91) communicate through electric valve and external water source, just electric valve passes through controller control.

3. The low-noise high-temperature-resistant mixed flow fan for fire fighting and smoke exhaust as claimed in claim 2, wherein: the cooling flow direction in the hollow interlayer of the heat insulation box (5) is downward inlet and upward outlet, the liquid inlet end of the heat insulation box (5) is close to the forward blade (3), and the liquid outlet end of the heat insulation box is far away from the forward blade (3).

4. The low-noise high-temperature-resistant mixed flow fan for fire-fighting and smoke-discharging as claimed in claim 3, wherein: and U-shaped cooling pipes (10) which are uniformly and annularly distributed are arranged in a hollow interlayer of the heat insulation box (5), and two ends of each U-shaped cooling pipe (10) are respectively communicated with the heat exchanger (91) and the circulating pump (93).

5. The low-noise high-temperature-resistant mixed flow fan for fire-fighting and smoke-discharging as claimed in claim 4, wherein: the U-shaped cooling pipe is characterized in that a spacer (11) is arranged on the outer side surface of the U-shaped cooling pipe (10), and heat-insulation refractory cotton (12) is arranged on the inner side surfaces of the spacer (11) and the heat-insulation box (5).

6. The low-noise high-temperature-resistant mixed flow fan for fire fighting and smoke exhaust as claimed in claim 1, wherein: the air inlet pipe (7) is provided with a filter screen (13), and the air inlet pipe (7) and the outer end of the air outlet pipe (8) are both provided with a protective cover (14).

7. The low-noise high-temperature-resistant mixed flow fan for fire-fighting and smoke-discharging according to claim 1, which is characterized in that: rope winder (163) include install bin (1631), roll-up axle (1632) and pivot (1633), install bin (1631) evenly sets up on the outer wall of inhaling sound casing (15), roll-up axle (1632) with pivot (1633) parallel arrangement and rotation are installed in install bin (1631), and through gear engagement, the one end of wire rope (162) is connected on roll-up axle (1632).