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54results about How to "Avoid Large Dangling Areas" patented technology

Improved automatic bridge cleaning and maintenance device

The invention provides an improved automatic bridge cleaning and maintenance device. A bridge includes a horizontal girder (4) with a horizontally extending guiding rib (2), and a secondary girder (41) supporting the horizontal girder (4); the automatic cleaning and maintenance device includes a support frame (99), a water supply pipe (61) supported by the support frame (99) and near to the horizontal girder (4), and a nozzle (62) communicated with the water supply pipe (61) and aligned to the part required to be cleaned of the bridge, so as to clean the part by spraying water; a plurality of guiding bulges extending along the guiding rib (2) are arranged on the upper surface and the lower surface of the guiding rib (2) respectively.
Owner:河南中州路桥建设有限公司 +2

Cleaning and maintaining device provided with flickering indicator lamp and used for outdoor steel member

The invention discloses a speed-adjustable cleaning and maintaining device provided with a flickering indicator lamp and used for an outdoor steel member. The cleaning and maintaining device is used for cleaning and maintaining the outdoor steel member. The outdoor steel member comprises a main beam (4) and secondary beams (41) supported on the main beam (4), wherein the main beam (4) is provided with a guide rib (2) extending in the longitudinal direction. The cleaning and maintaining device comprises a support frame (99), a water supply pipe (61) which is supported on the support frame (99) and close to the main beam (4), and a nozzle (62) communicated with the water supply pipe (61). A plurality of guide protrusions extending in the longitudinal direction are arranged on each of the upper surface and the lower surface of the guide rib (2) and can be matched with peripheral grooves (920) in an upper supporting idler wheel (921) and peripheral grooves (910) in a lower supporting idler wheel (911) of the cleaning and maintaining device, wherein the upper supporting idler wheel (921) is connected to the upper surface of the guide rib and the lower supporting idler wheel (911) is connected to the lower surface of the guide rib.
Owner:河南中装建设集团有限公司

Automatic bridge cleaning and maintaining device provided with caution light

Disclosed is an automatic bridge cleaning and maintaining device provided with a caution light. A bridge comprises a horizontal girder (4) provided with a horizontally extending guiding rib (2), and an auxiliary beam (41) supported by the horizontal girder (4). The automatic bridge cleaning and maintaining device comprises a supporting frame (99), a water supply pipe (61) which is supported by the supporting frame (99) and close to the girder (4), and a nozzle (62) communicated with the water supply pipe (61) to spray water onto the portions, needing to be cleaned, of the bridge. A plurality of guiding protrusions extending along the guiding rib (2) are arranged on the upper surface and lower surface of the guiding rib (2) respectively.
Owner:QIDONG CHUANGLYU GREENING ENG CO LTD

Good-heat-dissipation automatic cleaning maintaining device used for bridge

The invention discloses a good-heat-dissipation automatic cleaning maintaining device used for a bridge. The bridge comprises a transverse main beam (4) provided with a transversely-extending guide rib (2) and auxiliary beams (41) supported on the transverse main beam (4). The automatic cleaning maintaining device comprises a supporting frame (99), a water supplying pipe (61) which is supported on the supporting frame (99) and is close to the main beam (4) and a nozzle (62) communicated with the water supplying pipe (61), so that the automatic cleaning maintaining device can be aligned at the portion, needing to be cleaned, of the bridge for water spraying cleaning. The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of guiding protrusions extending along the guide rib (2).
Owner:王东培

Cleaning and maintaining device for outdoor steel structural component provided with electronic control valve and capable of conducting cooling

The invention provides a cleaning and maintaining device for an outdoor steel structural component provided with an electronic control valve and capable of conducting cooling. The cleaning and maintaining device is used for cleaning and maintaining the outdoor steel structural component. The outdoor steel structural component comprises a main beam (4) and an auxiliary beam (41). The main beam (4) is provided with a guide rib (2) extending in the longitudinal direction. The auxiliary beam (41) is supported by the main beam (4). The cleaning and maintaining device comprises a supporting frame (99), a water supply pipe (61) supported by the supporting frame (99) and close to the main beam (4), and a spray nozzle (62) communicated with the water supply pipe (61). The electronic control valve (11) is arranged on the water supply pipe (61) and used for controlling and regulating the water supply amount of the water supply pipe (61). The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of guide protrusions extending in the longitudinal direction, and therefore the protrusions can be matched with circumferential grooves (920 and 910) in an upper supporting wheel (921) and a lower supporting wheel (911) which are connected to the upper surface and the lower surface respectively.
Owner:方倩

Speed-adjustable cleaning and maintaining device provided with guide rods and used for outdoor steel member

The invention discloses a speed-adjustable cleaning and maintaining device provided with guide rods and used for an outdoor steel member. The cleaning and maintaining device is used for cleaning and maintaining the outdoor steel member. The outdoor steel member comprises a main beam (4) and secondary beams (41) supported on the main beam (4), wherein the main beam (4) is provided with a guide rib (2) extending in the longitudinal direction. The cleaning and maintaining device comprises a support frame (99), a water supply pipe (61) which is supported on the support frame (99) and close to the main beam (4), and a nozzle (62) communicated with the water supply pipe (61). A plurality of guiding protrusions extending in the longitudinal direction are arranged on each of the upper surface and the lower surface of the guide rib (2) and can be matched with peripheral grooves (920) in an upper supporting idler wheel (921) and peripheral grooves (910) in a lower supporting idler wheel (911) of the cleaning and maintaining device, wherein the upper supporting idler wheel (921) is connected to the upper surface of the guide rib and the lower supporting idler wheel (911) is connected to the lower surface of the guide rib.
Owner:ZHUJI CITY XINASI SOCKS CO LTD

Automatic cleaning maintaining device provided with guide rods and used for bridge

The invention discloses an automatic cleaning maintaining device provided with guide rods and used for a bridge. The bridge comprises a transverse main beam (4) provided with a transversely-extending guide rib (2) and auxiliary beams (41) supported on the transverse main beam (4). The automatic cleaning maintaining device comprises a supporting frame (99), a water supplying pipe (61) which is supported on the supporting frame (99) and close to the main beam (4) and a nozzle (62) communicated with the water supplying pipe (61) so that the automatic cleaning maintaining device can be aligned with the portion, needing to be cleaned, of the bridge for water spraying cleaning. The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of guiding protrusions extending along the guide rib (2).
Owner:临沂高新环卫有限公司

Cleaning maintenance device for outdoor steel structural component internally provided with LED lamp

The invention provides a cleaning maintenance device for an outdoor steel structural component internally provided with an LED lamp. The cleaning maintenance device for the outdoor steel structural component internally provided with the LED lamp is used for conducting cleaning maintenance on the outdoor steel structural component. The outdoor steel structural component comprises a main beam (4) provided with a guide rib (2) which extends longitudinally and auxiliary girders (41) supported on the main beam (4); the cleaning maintenance device comprises a support frame (99), a water supply pipe (61) which is supported on the support frame (99) and is close to the main beam (4) and a nozzle (62) communicated with the water supply pipe (61); and the upper surface and the lower surface of the guide rib (2) are each provided with multiple guide protrusions which extend longitudinally, and therefore the guide rib (2) can be matched with circumferential grooves (920) and circumferential grooves (910), formed in an upper support rolling wheel (921) and a lower support rolling wheel (911) which are matched with the upper surface and the lower surface of the guide rib (2), of the cleaning maintenance device.
Owner:方倩

An automatic cleaning and maintenance device for bridges powered by solar energy

Disclosed is an automatic cleaning and maintaining device powered up through solar energy and used for a bridge. The bridge comprises a horizontal main girder (4) and auxiliary girders (41). The horizontal main girder (4) is provided with a guide rib (2) extending horizontally, and the auxiliary girders (41) are supported on the horizontal main girder (4). The automatic cleaning and maintaining device comprises a supporting frame (99), a water supply tube (61) and a nozzle (62). The water supply tube (61) is supported on the supporting frame (99) and close to the main girder (4), and the nozzle (62) is communicated with the water supply tube (61) so as to be aligned with the position to be cleaned of the bridge for water spraying cleaning. Multiple guide protrusions extending along the guide rib (2) are arranged on the upper surface and the lower surface of the guide rib (2) respectively.
Owner:QINGDAO R & D INST XIAN JIAOTONG UNIV

Cleaning and maintenance device for outdoor steel structure with flashing indicator light

The invention discloses a speed-adjustable cleaning and maintaining device provided with a flickering indicator lamp and used for an outdoor steel member. The cleaning and maintaining device is used for cleaning and maintaining the outdoor steel member. The outdoor steel member comprises a main beam (4) and secondary beams (41) supported on the main beam (4), wherein the main beam (4) is provided with a guide rib (2) extending in the longitudinal direction. The cleaning and maintaining device comprises a support frame (99), a water supply pipe (61) which is supported on the support frame (99) and close to the main beam (4), and a nozzle (62) communicated with the water supply pipe (61). A plurality of guide protrusions extending in the longitudinal direction are arranged on each of the upper surface and the lower surface of the guide rib (2) and can be matched with peripheral grooves (920) in an upper supporting idler wheel (921) and peripheral grooves (910) in a lower supporting idler wheel (911) of the cleaning and maintaining device, wherein the upper supporting idler wheel (921) is connected to the upper surface of the guide rib and the lower supporting idler wheel (911) is connected to the lower surface of the guide rib.
Owner:河南中装建设集团有限公司

A low-noise automatic cleaning and maintenance device for bridges

Disclosed is a low-noise automatic clearing and maintaining device used for a bridge. The bridge comprises a transverse main girder (4) provided with a guide rib (2) extending transversely, and auxiliary girders (41) supported on the transverse main girder (4). The automatic clearing and maintaining device comprises a support frame (99), a water supply pipe (61) supported on the support frame (99) and close to the main girder (4), and a nozzle (62) which is communicated with the water supply pipe (61) to be aligned with the part, needing to be cleared, of the bridge to spray water for clearing. The upper surface and the lower surface of the guide rib (2) are provided with a plurality of guide protrusions extending along the guide rib (2) respectively.
Owner:李松

Cleaning and maintaining device for outdoor steel structural component provided with LED lamp and powered up through solar energy

The invention provides a cleaning and maintaining device for an outdoor steel structural component provided with an LED lamp and powered up through solar energy. The device is used for cleaning and maintaining the outdoor steel structural component. The outdoor steel structural component comprises a main beam (4) and auxiliary beams (41), the main beam (4) is provided with a longitudinally-extending guide rib (2), and the auxiliary beams (41) are used for supporting the main beam (4). The cleaning and maintaining device comprises a supporting frame (99), a water supply pipe (61) and a nozzle (62), the water supply pipe (61) is supported on the supporting frame (99) and is close to the main beam (4), and the nozzle (62) is communicated with the water supply pipe (61). The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of longitudinally-extending guide protrusions and can be matched with circumferential grooves (920 and 910) of the cleaning and maintaining device, and the circumferential grooves (920 and 910) are formed in an upper supporting roller (921) and a lower supporting roller (911) which are connected to the upper surface and the lower surface respectively.
Owner:方倩

An automatic cleaning and maintenance device for bridges

Disclosed is an automatic cleaning and maintaining device with the good damping effect for a bridge. The bridge comprises a main transverse beam (4) and an auxiliary beam (41), wherein the main transverse beam (4) is provided with a guiding rib (2) transversely extending, and the auxiliary beam (41) is supported on the main transverse beam (4). The automatic cleaning and maintaining device comprises a supporting frame, a water supply pipe (61) and a nozzle (62), wherein the water supply pipe (61) is supported on the supporting frame and is close to the main transverse beam (4), and the nozzle (62) is communicated with the water supply pipe (61) so as to be aligned to the portion, needing to be cleaned, of the bridge to spray water and clean the portion. The upper and lower surfaces of the guiding rib (2) are each provided with a plurality of guiding protrusions extending along the guiding rib (2).
Owner:江苏铭鹏装备有限公司

Efficient automatic cleaning and maintenance device for bridge

The invention provides an efficient automatic cleaning and maintenance device for a bridge. The bridge comprises a transverse girder (4) provided with a guide rib (2) transversely extending and an auxiliary beam (41) supported on the transverse girder (4). The automatic cleaning and maintenance device comprises a supporting frame (99), a water supply pipe (61) supported on the supporting frame (99) and close to the girder (4) and a spray nozzle (61) communicated with the water supply pipe (61) and used for spraying water to the portion, required to be cleaned, of the bridge to clean the portion. The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of guide protrusions stretching along the guide rib (2).
Owner:华邦建投集团股份有限公司

An improved automatic cleaning and maintenance device for bridges

The invention provides an improved automatic bridge cleaning and maintenance device. A bridge includes a horizontal girder (4) with a horizontally extending guiding rib (2), and a secondary girder (41) supporting the horizontal girder (4); the automatic cleaning and maintenance device includes a support frame (99), a water supply pipe (61) supported by the support frame (99) and near to the horizontal girder (4), and a nozzle (62) communicated with the water supply pipe (61) and aligned to the part required to be cleaned of the bridge, so as to clean the part by spraying water; a plurality of guiding bulges extending along the guiding rib (2) are arranged on the upper surface and the lower surface of the guiding rib (2) respectively.
Owner:河南中州路桥建设有限公司 +2

An automatic cleaning and maintenance device for bridges through electronic control

Disclosed is an electrically controlled automatic cleaning and maintaining device for a bridge. The bridge comprises a horizontal main girder (4) and auxiliary girders (41). The horizontal main girder (4) is provided with a guide rib (2) extending horizontally, and the auxiliary girders (41) are supported on the horizontal main girder (4). The automatic cleaning and maintaining device comprises a supporting frame (99), a water supply tube (61) and a nozzle (62). The water supply tube (61) is supported on the supporting frame (99) and close to the main girder (4), and the nozzle (62) is communicated with the water supply tube (61) so as to be aligned with the position to be cleaned for water spraying cleaning. Multiple guide protrusions extending along the guide rib (2) are arranged on the upper surface and the lower surface of the guide rib (2) respectively.
Owner:QINGDAO R & D INST XIAN JIAOTONG UNIV

Outdoor steel structural member cleaning maintenance device with exhaust fan

The invention provides an outdoor steel structural member cleaning maintenance device with an exhaust fan. The outdoor steel structural member cleaning maintenance device with the exhaust fan is used for cleaning and maintaining an outdoor steel structural member. The outdoor steel structural member comprises a main beam (4) and auxiliary beams (41), wherein the main beam (4) is provided with a longitudinally-extended guide rib (2), and the auxiliary beams (41) are supported on the main beam (4); the cleaning maintenance device comprises a support frame (99), a water supply pipe (61) supported on the support frame (99) and close to the main beam (4) and a nozzle (62) communicated with the water supply pipe (61), and a plurality of longitudinally-extended guide protrusions are arranged on the upper surface and the lower surface of the guide rib (2) respectively; and therefore the guide protrusions can be matched with circumferential grooves (920) and circumferential grooves (910) in an upper support roller (921) and a lower support roller (911), and the upper support roller (921) and the lower support roller (911) of the cleaning maintenance device are jointed with the upper surface and the lower surface respectively.
Owner:宁波市鄞州逐新贸易有限公司

Automatic clearing and maintaining device which has adjustable operation speed and is used for bridge

Disclosed is an automatic clearing and maintaining device which has adjustable operation speed and is used for a bridge. The bridge comprises a transverse main girder (4) provided with a guide rib (2) extending transversely, and auxiliary girders (41) supported on the transverse main girder (4). The automatic clearing and maintaining device comprises a support frame (99), a water supply pipe (61) supported on the support frame (99) and close to the main girder (4), and a nozzle (62) which is communicated with the water supply pipe (61) to be aligned with the part, needing to be cleared, of the bridge to spray water for clearing. The upper surface and the lower surface of the guide rib (2) are provided with a plurality of guide protrusions extending along the guide rib (2) respectively.
Owner:湖南省湘筑工程有限公司

An automatic cleaning and maintenance device with a guide rod and used for bridges

The invention discloses an automatic cleaning maintaining device provided with guide rods and used for a bridge. The bridge comprises a transverse main beam (4) provided with a transversely-extending guide rib (2) and auxiliary beams (41) supported on the transverse main beam (4). The automatic cleaning maintaining device comprises a supporting frame (99), a water supplying pipe (61) which is supported on the supporting frame (99) and close to the main beam (4) and a nozzle (62) communicated with the water supplying pipe (61) so that the automatic cleaning maintaining device can be aligned with the portion, needing to be cleaned, of the bridge for water spraying cleaning. The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of guiding protrusions extending along the guide rib (2).
Owner:临沂高新环卫有限公司

Portable outdoor steel structural component cleaning and maintenance device provided with LED lamp

The invention discloses a portable outdoor steel structural component cleaning and maintenance device provided with an LED lamp. The device is used for cleaning and maintaining an outdoor steel structural component. The outdoor steel structural component comprises main beams (4) provided with guide ribs (2) extending in the longitudinal direction and auxiliary beams (41) supported by the main beams (4). The cleaning and maintenance device comprises a supporting frame (99), a water supply pipe (61) which is supported on the supporting frame (99) and is close to the main beam (4) and a spray nozzle (62) communicated with the water supply pipe (61). The upper end and the lower end of the supporting frame (99) are each provided with a gripping part (101) used for lifting and carrying the cleaning and maintenance device. Each gripping part (101) is in a rectangle shape. The upper surface and the lower surface of each guide rib (2) are each provided with a plurality of longitudinal extending guide protrusions so that the protrusions can be matched with circumferential grooves (920 and 910) in an upper supporting roller (921) and a lower supporting roller (911) which are connected with the upper surface and the lower surface of the cleaning and maintenance device respectively.
Owner:林江梅

Cleaning and maintenance device for outdoor steel structure part adopting contact sensor

The invention discloses a cleaning and maintenance device for an outdoor steel structure part adopting a contact sensor. The cleaning and maintenance device is used for cleaning and maintaining the outdoor steel structure part. The outdoor steel structure part comprises a main beam (4) with a guide rib (2) extending in the longitudinal direction and auxiliary beams (41) supported on the main beam (4). The cleaning and maintenance device comprises a supporting frame (99), a water supply pipe (61) and a nozzle (62), wherein the water supply pipe (61) is supported on the supporting frame (99) and is close to the main beam (4), and the nozzle (62) is communicated with the water supply pipe (61). A plurality of longitudinally-extending guide protrusions are arranged on the upper surface and the lower surface of the guide rib (2), and therefore the guide rib (2) can match circumferential grooves (920 and 910) in an upper supporting roller (921) and a lower supporting roller (911), which are connected to the upper surface and the lower surface respectively, of the cleaning and maintenance device.
Owner:SHANGYU YADU ELECTRONICS TECH

A high-efficiency automatic cleaning and maintenance device for bridges

A high-efficiency automatic cleaning and maintenance device for bridges, the bridge includes a transverse main beam (4) provided with transversely extending guide ribs (2) and an auxiliary beam (41) supported on the transverse main beam (4), the The automatic cleaning and maintenance device includes a support frame (99), a water supply pipe (61) supported on the support frame (99) and close to the main beam (4), and a nozzle ( 62) Cleaning by spraying water on the parts of the bridge that need to be cleaned, and the upper and lower surfaces of the guide ribs (2) are respectively provided with a plurality of guide protrusions extending along the guide ribs (2).
Owner:华邦建投集团股份有限公司

Cleaning and maintaining device with left and right limiting sensors and used for outdoor steel structural member

The invention provides a cleaning and maintaining device with left and right limiting sensors and used for an outdoor steel structural member. The cleaning and maintaining device is used for cleaning and maintaining the outdoor steel structural member. The outdoor steel structural member comprises a main beam (4) provided with a guiding rib (2) extending in the longitudinal direction and auxiliary beams (41) supported by the main beam (4). The cleaning and maintaining device comprises a supporting frame (99), a water supply pipe (61) supported by the supporting frame (99) and close to the main beam (4) and a nozzle (62) communicated with the water supply pipe (61). The upper surface and the lower surface of the guiding rib (2) are each provided with a plurality of guiding protrusions extending in the longitudinal direction, and therefore the guiding rib (2) can be matched with circumferential grooves (920 and 910) in an upper supporting roller (921) and a lower supporting roller (911) connected to the upper surface and the lower surface of the cleaning and maintaining device respectively.
Owner:XIAMEN CITY YOUJIAPIN COMMODITY

An automatic cleaning and maintenance device with improved service life and used for bridges

The invention provides an automatic bridge cleaning and maintenance device capable of prolonging the service life. A bridge comprises a transverse girder (4) provided with a guide rib (2) transversely extending and an auxiliary beam (41) supported on the transverse girder (4). The automatic bridge cleaning and maintenance device comprises a supporting frame (99), a water supply pipe (61) supported on the supporting frame (99) and close to the girder (4) and a spray nozzle (61) communicated with the water supply pipe (61) and used for spraying water to the portion, required to be cleaned, of the bridge to clean the portion. The upper surface and the lower surface of the guide rib (2) are each provided with a plurality of guide protrusions stretching along the guide rib (2).
Owner:江苏麦格美节能科技有限公司

Automatic cleaning and maintaining device with good damping effect for bridge

Disclosed is an automatic cleaning and maintaining device with the good damping effect for a bridge. The bridge comprises a main transverse beam (4) and an auxiliary beam (41), wherein the main transverse beam (4) is provided with a guiding rib (2) transversely extending, and the auxiliary beam (41) is supported on the main transverse beam (4). The automatic cleaning and maintaining device comprises a supporting frame, a water supply pipe (61) and a nozzle (62), wherein the water supply pipe (61) is supported on the supporting frame and is close to the main transverse beam (4), and the nozzle (62) is communicated with the water supply pipe (61) so as to be aligned to the portion, needing to be cleaned, of the bridge to spray water and clean the portion. The upper and lower surfaces of the guiding rib (2) are each provided with a plurality of guiding protrusions extending along the guiding rib (2).
Owner:江苏铭鹏装备有限公司

Outdoor steel structure member cleaning and maintaining device having damping function

The invention provides an outer steel structure member cleaning and maintaining device having a damping function. The outer steel structure member cleaning and maintaining device is used for cleaning and maintaining an outer steel structure member, the outer steel structure member comprises a main beam (4) of a longitudinally-extending guide rib (2) and an auxiliary beam (41) supported on the main beam (4), and the cleaning and maintaining device comprises a supporting frame (99), a water supply pipe (61) supported on the supporting frame (99) and close to the main beam (4) and a spray nozzle (62) communicated with the water supply pipe (61). Multiple longitudinally-extending guide protrusions are arranged on the upper surface and the lower surface of the guide rib (2) respectively so that the upper surface and the lower surface of the guide rib (2) can be matched with circumferential grooves (920 and 910) formed in an upper supporting roller (921) and a lower supporting roller (911) which are respectively connected to the upper surface and the lower surface of the cleaning and maintaining device.
Owner:宁波市标新机械科技有限公司

Outdoor steel structural piece cleaning and maintaining device with heat dissipation function

The invention discloses an outdoor steel structural piece cleaning and maintaining device with the heat dissipation function to carry out cleaning and maintaining on an outdoor steel structural piece. The outdoor steel structural piece comprises a main beam (4) with a longitudinally-extending guiding rib (2) and auxiliary beams (41) supported on the main beam (4). The cleaning and maintaining device comprises a supporting frame (99), a water supply pipe (61) which is supported on the supporting frame (99) and is close to the main beam (4), and a nozzle (62) communicated with the water supply pipe (61). A plurality of longitudinally-extending guiding protrusions are arranged on the upper surface and the lower surface of the guiding rib (2) respectively so as to be matched with a circumferential groove (920) and a circumferential groove (910) in an upper supporting wheel (921) and a lower supporting wheel (911), connected to the upper surface and the lower surface, of the cleaning and maintaining device respectively.
Owner:宁波市标新机械科技有限公司

Automatic bridge cleaning and maintaining device for preventing moving over travel

The invention discloses an automatic bridge cleaning and maintaining device for preventing moving over travel. A bridge comprises a transverse main beam (4) provided with a guide rib (2) extending transversely and secondary beams (41) supported on the transverse main beam (4); the automatic cleaning and maintaining device comprises a support frame (99), a water supply pipe (61) which is supported on the support frame (99) and is close to the main beam (4) and a nozzle (62) which is communicated with the water supply pipe (61) and used for spraying water and cleaning the portion, needing to be cleaned, of the bridge; the upper surface and the lower surface of the guide rib (2) are provided with multiple guide protrusions extending along the guide rib (2) respectively.
Owner:徐州金港起重机制造有限公司
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