CN114575246A - Walking device of arch bridge inspection vehicle - Google Patents
Walking device of arch bridge inspection vehicle Download PDFInfo
- Publication number
- CN114575246A CN114575246A CN202210317525.2A CN202210317525A CN114575246A CN 114575246 A CN114575246 A CN 114575246A CN 202210317525 A CN202210317525 A CN 202210317525A CN 114575246 A CN114575246 A CN 114575246A
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- Prior art keywords
- wheel
- arch bridge
- track
- bridge inspection
- sprocket
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007689 inspection Methods 0.000 title claims abstract description 28
- 230000001012 protector Effects 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000009194 climbing Effects 0.000 description 8
- 230000009467 reduction Effects 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/106—Movable inspection or maintenance platforms, e.g. travelling scaffolding or vehicles specially designed to provide access to the undersides of bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a walking device of an arch bridge inspection vehicle, which comprises a track laid on an arch bridge, a box body arranged along the track in a moving way and a power component for driving the box body to move, wherein the walking device of the arch bridge inspection vehicle comprises: the chain is fixedly arranged on the upper end surface of the track along the symmetrical surface of the track; the driving chain wheel is rotatably arranged in the box body, is positioned on a symmetrical plane of the track and is meshed with the chain, and the driving chain wheel is connected with the power assembly. The invention changes the structure in the box body, and arranges the driving chain wheel and the chain on the symmetrical surface of the track. This eliminates the problem of the prior art arrangement causing drive imbalance and thus additional torque. Through the arrangement, the driving chain wheel can be prevented from being subjected to additional force except for driving force, the service life of the driving chain wheel is prolonged, and the safety factor is improved.
Description
Technical Field
The invention relates to a walking device, in particular to a walking device of an arch bridge inspection vehicle.
Background
The arch bridge inspection vehicle is an important tool for the inspection and maintenance of the bridge arch by operators, and can safely and efficiently convey maintainers to the positions of the arch bridge to be inspected. The arch bridge inspection vehicle moves by means of the walking device at the bottom.
At present, the running gear of the bridge arch inspection vehicle mainly has two implementation modes: the first is that the tyre in the walking device adopts a rubber wrapping mode to enhance the friction between the tyre and the track, directly walks on the track in positive pressure, and simultaneously adopts a compression spring to compress a counter roller below through elasticity to increase the friction; the second type is that a fixed chain is arranged below a flange plate on one side of the H-shaped steel track, a driving chain wheel is arranged on the traveling device, and the driving chain wheel is matched with the chain to drive the traveling device to travel on the track.
The first walking mode has the problem of weak arch climbing capability because of arch climbing through friction force. The first type of walking currently supports only a maximum arch climbing angle of 40 ° and is prone to slippage in inclement weather. The second walking mode is driven by the cooperation of the chain and the driving chain wheel, and compared with the first walking mode, the arch climbing capacity is improved, but the load bearing capacity is lower.
Chinese patent document CN105172924A discloses a walking device for arch bridge, which is very easy to wear a driving sprocket part and has potential safety hazard of overturning during the arch climbing process with large angle and high load.
Disclosure of Invention
In view of the above-mentioned technical problems, the present invention is directed to a walking device of an arch bridge inspection vehicle, which can prolong the service life of a driving sprocket.
According to the invention, the walking device of the arch bridge inspection vehicle comprises a track laid on an arch bridge, a box body arranged along the track in a moving way and a power assembly driving the box body to move, and the walking device of the arch bridge inspection vehicle further comprises: the chain is fixedly arranged on the upper end surface of the track along the symmetrical surface of the track; and the driving chain wheel is arranged in the box body, is meshed with the chain and is driven to rotate by the power assembly.
In a preferred embodiment, a falling prevention mechanism is further provided on the box body, and the falling prevention mechanism includes: the falling protector is fixedly arranged on the box body; the trigger chain wheel is arranged in the box body and meshed with the chain, and the trigger chain wheel is connected with the falling protector.
In a preferred embodiment, the distance between the central axis of the driving sprocket and the central axis of the triggering sprocket in the direction parallel to the track is an integral multiple of the pitch of the chain.
In a preferred embodiment, a first traveling wheel and a second traveling wheel are further arranged in the box body, the first traveling wheel and the second traveling wheel are symmetrically arranged on two sides of the driving chain wheel, and the first traveling wheel and the second traveling wheel are abutted to the upper end face of the track.
In a preferred embodiment, the power assembly further comprises a drive shaft disposed within the housing, the drive sprocket being fixedly disposed on the drive shaft.
In a preferred embodiment, the first road wheel and the second road wheel are rotatably arranged on the drive shaft.
In a preferred embodiment, the box body is further provided with two first counter rollers in a rotating manner, the two first counter rollers are symmetrically arranged on two sides of the track, and the two first counter rollers are abutted to the bottom surface of the upper wing of the track.
In a preferred embodiment, a third travelling wheel and a fourth travelling wheel are further rotatably arranged in the box body, the third travelling wheel and the fourth travelling wheel are respectively symmetrically arranged on two sides of the trigger chain wheel, and the third travelling wheel and the fourth travelling wheel are both abutted against the upper end face of the track.
In a preferred embodiment, the anti-falling mechanism further comprises a rotating shaft arranged in the box body, the trigger chain wheel is fixedly arranged on the rotating shaft, and the third traveling wheel and the fourth traveling wheel are both arranged on the rotating shaft.
In a preferred embodiment, the box body is further provided with two second counter rollers in a rotating manner, the two second counter rollers are respectively and symmetrically arranged on two sides of the track, and the two counter rollers are both abutted to the bottom surface of the upper wing of the track.
Compared with the prior art, the method has the following advantages.
The invention changes the structure in the box body, and arranges the driving chain wheel and the chain on the symmetrical surface of the track. This eliminates the problem of the prior art arrangement causing drive imbalance and thus additional torque. Through the arrangement, the driving chain wheel can be prevented from being subjected to additional force except for driving force, the service life of the driving chain wheel is prolonged, and the safety factor is improved.
In addition, the invention is also provided with a falling protector. When the traveling device abnormally and quickly moves, the falling protector is automatically started, so that the falling protector can be timely braked, and the safety coefficient is improved.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows a schematic perspective view of an arch bridge inspection vehicle running gear according to the invention;
FIG. 2 is a schematic front view of the walking device of the inspection vehicle for arch bridges according to the present invention;
FIG. 3 is a schematic left side view of the walking device of the arch bridge inspection vehicle according to the present invention;
FIG. 4 is a schematic sectional view showing the inside of the case in the direction A-A of FIG. 2;
fig. 5 is a schematic sectional view showing the inside of the case in the direction B-B of fig. 2.
In the present application, the drawings are schematic, merely illustrative of the principles of the invention, and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In this application, it should be noted that the side of the track according to the invention, which is fixedly connected to the arch bridge (not shown in the figures), is described as "lower end", "bottom" or the like, i.e. the lower side as shown in fig. 2. While the side of the track remote from the arch bridge (not shown in the figures) is described as the "upper end" or the like, i.e. the upper side as shown in fig. 2.
Fig. 1 shows a perspective view of the running gear of the arch bridge inspection vehicle according to the invention. As shown in fig. 1, the running gear 1 includes a rail 2, a casing 11, and a power unit 12. The track 2 is laid on an arch bridge (not shown in the figure). The box 11 is provided on the rail 2, and the box 11 is movable along the rail 2. The power assembly 12 is disposed outside the casing 11 for driving the casing 11 to move along the rail 2. With this arrangement, the power assembly 12 can be used to move the housing 11 along the track 2 to a location of the arch bridge (not shown) that requires inspection.
In the present embodiment, as shown in fig. 1 to 4, a chain 4 is fixedly provided on the upper end surface of the rail 2 along the extending direction of the rail 2. And the chain 4 is located on the plane of symmetry of the track 2. A drive sprocket 126 is rotatably arranged in the housing 11, the drive sprocket 126 likewise lying on the plane of symmetry of the rail 2. And, the driving sprocket 126 meshes with the chain 4. Meanwhile, the drive sprocket 126 is connected to the power module 12. With the above arrangement, the power assembly 12 can drive the driving sprocket 126 to rotate. Under the meshing relationship between the driving sprocket 126 and the chain 4, the driving sprocket 126 can roll along the chain 4, thereby moving the box 11 along the track 2. According to the invention, the chain 4 and the drive sprocket 126 are arranged on a plane of symmetry of the track 2, forming a symmetrical structure.
The applicant of the present invention has found that in the prior art, the driving sprocket 126 is susceptible to wear primarily due to the additional torque caused by the structural asymmetry. Therefore, compared with the prior art, the embodiment eliminates the additional torque brought to the driving chain wheel 126 due to the asymmetric structure, thereby prolonging the service life of the driving chain wheel 126, simultaneously improving the safety factor of use, and indirectly improving the bearing capacity and the arch climbing capacity of the walking device 1.
In a preferred embodiment, a fall arrest mechanism 13 is also provided on the housing 11. As shown in fig. 3 and 5, in the present embodiment, the fall arrest mechanism 13 includes a fall arrester 131 and a trigger sprocket 134 connected to the fall arrester 131. The trigger sprocket 134 is located on the plane of symmetry of the track 2. And, the trigger sprocket 134 meshes with the chain 4. With this arrangement, when the housing 11 moves along the rail 2, the trigger sprocket 134 provided on the housing 11 moves together with the housing 11. Meanwhile, since the trigger sprocket 134 is engaged with the chain 4, the trigger sprocket 134 rotates while following the movement of the case 11. When the trigger sprocket 134 rotates, the falling protector 131 is driven to rotate together. When the rotation speed of the falling protector 131 reaches the self-set rotation speed, the falling protector 131 can brake, so that the trigger chain wheel is prevented from continuing to rotate, and the box body 11 is limited to move. In this way, the risk of the running gear 1 falling off as a whole in the event of an accident in the electric brake is reduced.
It is easily understood that the electric brake is a device for assisting the braking of the traveling device in the prior art, and the falling protector 131 is in the prior art and will not be described in detail herein.
In the present embodiment, the safety catch 131 is a cone-drum shaped progressive safety catch.
In a specific embodiment, the distance between the central axis of the driving sprocket 126 and the central axis of the triggering sprocket 134 in the direction parallel to the track 2 is an integral multiple of the pitch of the chain 3. By this arrangement, it is ensured that the drive sprocket 126 and the trigger sprocket 134 can be completely engaged with the chain 3 at the same time.
In a specific embodiment, the direction in which the central axis of the driving sprocket 126 and the central axis of the triggering sprocket 134 are perpendicular to the track 2 allows for a height difference, i.e., the diameter of the triggering sprocket 134 and the diameter of the driving sprocket 126 may not be equal. In a preferred embodiment, the diameter of the trigger sprocket 134 is smaller than the diameter of the drive sprocket 126. In this case, the trigger sprocket 134 can obtain a higher rotational speed than the drive sprocket 126. When an accident occurs and the moving speed of the traveling device 1 is obviously higher than the normal speed, the triggering chain wheel 134 can drive the falling protector 131 to obtain a larger centrifugal rotating speed, so that the falling protector triggers the braking effect and the safety is improved.
According to the present invention, a first traveling wheel 124 and a second traveling wheel 125 are rotatably provided inside the housing 11. Wherein the first road wheel 124 and the second road wheel 125 are respectively positioned at both sides of the driving sprocket 126. The first road wheels 124 and the second road wheels 125 are both in contact with the upper end surface of the rail 2. With this arrangement, the housing 11 moves along the rails by the first and second traveling wheels 124 and 125, thereby reducing the friction and reducing the driving load of the driving sprocket 126.
In a specific embodiment, the power assembly 12 further includes a driving shaft 123, and the driving shaft 123 is rotatably disposed along the axial direction of the driving sprocket 126 in the housing 11. Drive sprocket 126 is fixedly connected to drive shaft 123 by drive key 127. The first road wheel 124 and the second road wheel 125 are rotatably provided on the driving shaft 123 through bearings, respectively. With this arrangement, the drive sprocket 126, the first road wheel 124 and the second road wheel 125 are compact. The bearing in this embodiment may also be replaced with a bushing.
According to the present invention, two first counter rollers 128 are rotatably disposed in the box 11, and the two first counter rollers 128 are symmetrically installed on both sides of the rail 2. Both of the first counter rollers 128 abut against the lower end surface of the upper wing of the rail 2. As further described in conjunction with fig. 3 and 4, the second road wheels 125 and the left first counter-roller 128 abut against the upper and lower sides of the left half of the upper wing of the rail 2, respectively. The first traveling wheel 124 and the first counter roller 128 on the right respectively abut on the upper and lower sides of the right half of the upper wing of the rail 2. The first counter roller 128 engages the first road wheel 124 and the second road wheel 125 to restrain the housing 11 on the track 2. Through setting up like this, can effectively improve and climb the arch ability, prevent to overturn.
According to the present invention, a third traveling wheel 133 and a fourth traveling wheel 135 are rotatably provided inside the cabinet 11. Wherein the third traveling wheel 133 and the fourth traveling wheel 135 are respectively located at both sides of the trigger sprocket 134. The third traveling wheel 133 and the fourth traveling wheel 135 are both in contact with the upper end surface of the rail 2. By this arrangement, the box body 11 is responsible for bearing the weight through the first road wheel 124, the second road wheel 125, the third road wheel 133 and the fourth road wheel 135, moves along the track and reduces the friction force. The drive sprocket 126 is solely responsible for providing the driving force. The trigger sprocket 134 is only responsible for converting the speed of movement of the cage 11 into a rotational speed to be transmitted to the fall arrester 131. Thereby extending the useful life of the drive sprocket 126 and the trigger sprocket 134.
In a specific embodiment, the falling protector 131 further includes a rotating shaft 132, and the rotating shaft 132 is rotatably disposed along the axial direction of the trigger sprocket 134 in the housing 11. The trigger sprocket 134 is fixedly connected with the rotating shaft 132 through an anti-falling key 136. The third traveling wheel 133 and the fourth traveling wheel 135 are rotatably provided on the rotating shaft 132 through bearings, respectively. With this arrangement, the trigger sprocket 134, the third running wheel 133 and the fourth running wheel 135 are compact. The bearing in this embodiment may also be replaced with a bushing.
According to the present invention, two second counter rollers 137 are rotatably disposed in the housing 11, and the two second counter rollers 137 are symmetrically installed at both sides of the rail 2. Both of the second counter rollers 137 abut against the lower end surface of the upper wing of the rail 2. As further explained in connection with fig. 3 and 5, the fourth running wheel 135 and the left second counter-roller 137 abut against the upper and lower sides of the left half of the upper wing of the rail 2, respectively. The third traveling wheel 133 and the right second counter roller 137 abut against the upper and lower sides of the right half of the upper wing of the rail 2, respectively. The second counter roller 137 cooperates with the third running wheel 133 and the fourth running wheel 135 to restrain the housing 11 on the rail 2. Through setting up like this, can effectively improve and climb the arch ability, prevent to overturn.
In a particular embodiment, the power assembly 12 includes a speed reducer 122 and a motor 121. The reduction gear 122 is fixedly provided outside the case 11, and an output shaft of the reduction gear 122 is connected to the drive shaft 123. The motor 121 is fixedly provided on the input shaft side of the reduction gear 122, and the output shaft of the motor 121 is connected to the input shaft of the reduction gear 122.
It is easy to understand that the motor 121 and the reducer 122 are both prior art and will not be described in detail herein.
According to the invention, the chain 3, the driving chain wheel 126 and the track 2 form a symmetrical structure, so that the safety factor of the chain 3 and the driving chain wheel 126 is improved, and additional torque is avoided. Meanwhile, the first traveling wheel 124, the second traveling wheel 125, the third traveling wheel 133, the fourth traveling wheel 135, the first counter roller 128 and the second counter roller 137 are combined, so that the arch climbing capability of the traveling device 1 is improved, and the maximum 90-degree arch climbing angle can be realized.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an arch bridge inspection car running gear, is including laying track (2) on the arch bridge, following box (11) and the drive that track (2) removed the setting power component (12) that box (11) removed, its characterized in that, arch bridge inspection car running gear still includes:
the chain (3) is fixedly arranged on the upper end face of the track (2) along the symmetrical plane of the track (2);
a drive sprocket (126) disposed within the housing (11), the drive sprocket (126) being disposed to engage the chain (3) and being driven in rotation by the power assembly (12).
2. The walking device of the arch bridge inspection vehicle according to claim 1, wherein a falling prevention mechanism (13) is further provided on the box body (11), and the falling prevention mechanism (13) comprises:
the falling protector (131) is fixedly arranged on the box body (11);
a trigger sprocket (134) disposed within the case (11), the trigger sprocket (134) meshing with the chain (3) and,
the triggering chain wheel (134) is connected with the falling protector (131).
3. The arch bridge inspection vehicle traveling device according to claim 2, wherein the distance between the center axis of the drive sprocket (126) and the center axis of the trigger sprocket (134) in the direction parallel to the rail (2) is an integral multiple of the pitch of the chain (3).
4. The arch bridge inspection vehicle traveling device according to claim 1, wherein a first traveling wheel (124) and a second traveling wheel (125) are further provided in the box body (11), the first traveling wheel (124) and the second traveling wheel (125) are symmetrically provided on both sides of the driving sprocket (126), and both the first traveling wheel (124) and the second traveling wheel (125) abut against an upper end surface of the rail (2).
5. The arch bridge inspection vehicle running gear according to claim 4, wherein the power assembly (12) further comprises a drive shaft (123) disposed inside the box body (11), and the drive sprocket (126) is fixedly disposed on the drive shaft (123).
6. The arch bridge inspection vehicle walking device of claim 5, wherein the first road wheel (124) and the second road wheel (125) are rotatably disposed on the drive shaft (123).
7. The arch bridge inspection vehicle walking device according to claim 4, wherein a first counter roller (128) is further rotatably arranged in the box body (11), the number of the first counter rollers (128) is two, the two first counter rollers (128) are symmetrically arranged on two sides of the track (2), and the two first counter rollers (128) are abutted against the bottom surface of the upper wing of the track (2).
8. The arch bridge inspection vehicle walking device according to claim 2, wherein a third walking wheel (133) and a fourth walking wheel (135) are rotatably arranged inside the box body (11), the third walking wheel (133) and the fourth walking wheel (135) are symmetrically arranged on two sides of the trigger chain wheel (134), and the third walking wheel (133) and the fourth walking wheel (135) are abutted against the upper end face of the track (2).
9. The arch bridge inspection vehicle traveling device according to claim 8, wherein the falling prevention mechanism (13) further comprises a rotating shaft (132) provided in the housing (11), the trigger sprocket (134) is fixedly provided on the rotating shaft (132), and the third traveling wheel (133) and the fourth traveling wheel (135) are both provided on the rotating shaft (132).
10. The arch bridge inspection vehicle running gear according to claim 9, wherein a second counter roller (137) is further rotatably arranged in the box body (11), the number of the second counter rollers (137) is two, the two second counter rollers (137) are symmetrically arranged on two sides of the rail (2), and the two counter rollers are abutted against the bottom surface of the upper wing of the rail (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210317525.2A CN114575246A (en) | 2022-03-29 | 2022-03-29 | Walking device of arch bridge inspection vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210317525.2A CN114575246A (en) | 2022-03-29 | 2022-03-29 | Walking device of arch bridge inspection vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114575246A true CN114575246A (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210317525.2A Pending CN114575246A (en) | 2022-03-29 | 2022-03-29 | Walking device of arch bridge inspection vehicle |
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| Country | Link |
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| CN (1) | CN114575246A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894966A (en) * | 2015-06-03 | 2015-09-09 | 株洲时代新材料科技股份有限公司 | Travelling device for arch bridge |
| CN105172923A (en) * | 2015-06-03 | 2015-12-23 | 株洲时代新材料科技股份有限公司 | Driving system and method for arch bridge detection car |
| US20220045489A1 (en) * | 2019-11-08 | 2022-02-10 | Institute Of Automation, Chinese Academy Of Sciences | Carrier mechanism for walking on line |
-
2022
- 2022-03-29 CN CN202210317525.2A patent/CN114575246A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894966A (en) * | 2015-06-03 | 2015-09-09 | 株洲时代新材料科技股份有限公司 | Travelling device for arch bridge |
| CN105172923A (en) * | 2015-06-03 | 2015-12-23 | 株洲时代新材料科技股份有限公司 | Driving system and method for arch bridge detection car |
| US20220045489A1 (en) * | 2019-11-08 | 2022-02-10 | Institute Of Automation, Chinese Academy Of Sciences | Carrier mechanism for walking on line |
Non-Patent Citations (1)
| Title |
|---|
| 雷钧;: "升降机齿轮锥鼓形渐进式防坠安全器的定期检验" * |
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Application publication date: 20220603 |