CN211342280U - Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing - Google Patents
Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing Download PDFInfo
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- CN211342280U CN211342280U CN201922383734.3U CN201922383734U CN211342280U CN 211342280 U CN211342280 U CN 211342280U CN 201922383734 U CN201922383734 U CN 201922383734U CN 211342280 U CN211342280 U CN 211342280U
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- 238000005553 drilling Methods 0.000 title claims abstract description 25
- 238000003756 stirring Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model provides a rotary drilling rig boarding platform vehicle body rotary-opening door opening self-positioning device, including locating lever, bracket and L-shaped clamping plate, the bracket is arranged on the door bracket, the clamping plate is arranged on the door panel, the bracket is provided with a first through hole, the clamping plate is provided with a second through hole, the locating lever main body horizontally passes through a second through hole, the head end of the locating lever is rotatably arranged in the first through hole, the position of the locating lever main body close to the tail end is provided with a wedge-shaped inverted beard block, the inverted beard block can pass through the second through hole, an interval is kept between the inverted beard block and the tail end of the locating lever, the clamping plate can be locked by the interval, so as to realize self; the positioning rod can be lifted upwards, and after the positioning rod is lifted, the inverted beard block can return to the through hole II along with the closing of the door, so that the locking of the door panel is released, and the door panel can be smoothly rotated and closed. The utility model discloses the part is few, and the structure is retrencied, long service life, simple to operate, and the maintenance cost is few, and is with low costs, very practical.
Description
Technical Field
The utility model relates to a dig the platform of getting on the bus of rig soon, especially a dig platform automobile body of getting on the bus of rig soon and open self-align device soon.
Background
The rotary drilling rig is one of piling machines introduced and developed in recent years in China, is mainly applied to super-large bridge piles of various highways and railway bridges and special structure bearing foundation piles of other large buildings, and is a main pile foundation soil taking and hole forming tool. The rotary drilling rig has the characteristics of high power, high drilling speed, high automation degree, large drilling hole diameter, accurate positioning, high working efficiency and the like, and has more and more outstanding advantages in construction.
The loading platform is a main supporting platform of a control room, a mast system, a drilling system and a hoisting system of the rotary drilling rig, and the bottom of the loading platform is connected with a chassis through a rotary support. A hydraulic system and electromechanical device for controlling a mast system, a drilling system and a hoisting system are arranged in cabinets on two sides of a boarding platform body, doors of cabinets on two sides of the existing boarding platform body are generally arranged to be vertical covering part door plates, the door plates are divided into a fixed door and a swing-out door, the fixed door cannot be opened, one end of the swing-out door plate is provided with a hinge for connecting a door support, the other end of the swing-out door plate is provided with a key lock catch and can be manually opened or closed, the swing-out door has the main function that when electromechanical or hydraulic faults occur in the corresponding cabinet of the swing-out door, workers can conveniently and timely open the door to check the door and serve as a maintenance channel of the workers, and if the door plates cannot be timely positioned and fixed after the door is opened, the door plates can randomly rotate under the action of self weight or other external forces, and accordingly normal. Therefore, there is a need in the art for a solution to this problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a dig rig platform automobile body soon and open self-align device with revolving to solve the problem that proposes in the background art.
A self-positioning device for opening a swing door of an upper vehicle platform body of a rotary drilling rig comprises a positioning rod, an inverted beard block, a bracket and an L-shaped clamping plate, wherein the bracket is arranged on a door bracket of the swing door of the upper vehicle platform body cabinet body, and the clamping plate is arranged on a door plate of the swing door of the upper vehicle platform body cabinet body;
the bracket comprises a bracket body and a supporting plate arranged on the bracket body, the surface of the supporting plate is parallel to the rotating plane of the door panel, and the supporting plate is provided with a first through hole;
the L-shaped clamping plate comprises a connecting part connected with the door plate and a vertical part vertical to the door plate, the plate surface of the vertical part is arranged along the vertical direction, and a second through hole is formed in the vertical part;
the positioning rod comprises a horizontally arranged positioning rod main body positioned in the middle, and a first end and a second end which are respectively arranged at the head end and the tail end of the positioning rod main body, and the positioning rod main body horizontally penetrates through the second through hole of the vertical part;
the first end comprises an L-shaped first elbow and a first extension section, the first extension section is continuously arranged along the vertical direction of the first elbow, the first extension section vertically penetrates through the first through hole of the supporting plate, the positioning rod can rotate by taking the first through hole as a center, and the tail end of the first extension section is provided with a limiting part for preventing the first extension section from falling out of the first through hole;
when the door plate of the swing door is opened and the door plate is pulled to enable the door plate to rotate around the connecting hinge on the door support, the clamping plate stirs the positioning rod through the through hole II to rotate together with the door plate, and enables the positioning rod to rotate by taking the through hole I as a center;
the second end comprises an L-shaped second elbow and a second extension section, the second extension section is continuously arranged along the vertical direction, the vertical length of the second extension section is greater than the vertical size of the second through hole, and the second extension section is used for preventing the tail end of the positioning rod from falling off from the second through hole when the positioning rod rotates to the maximum angle along with the opening of the door panel;
the position, close to the second end, of the positioning rod main body is convexly provided with the inverted beard block along the vertical downward direction, the inverted beard block is arranged to be of a wedge-shaped structure, the vertical size of the inverted beard block is gradually increased along the direction close to the tail end of the positioning rod, the starting position, farthest away from the tail end of the positioning rod, of the inverted beard block is smoothly in transition with the positioning rod main body, so that the inverted beard block can smoothly enter the second through hole, the vertical size of the second through hole is larger than the sum of the vertical sizes of the inverted beard block and the positioning rod main body at the position of the maximum vertical size of the inverted beard block, and the inverted beard;
the horizontal interval is kept between must piece and the second extension to the contrary piece, and this horizontal interval is as the locking groove of locking the perpendicular part of cardboard, and the length of registration lever and the position of must piece are set up to satisfying: when the door plate is rotated to be opened to a certain angle, the vertical part of the clamping plate arranged on the door plate is just clamped in the locking groove, so that the self-positioning and locking of the door plate at the current opening angle are realized;
the adjusting distance enabling the first extending section to move upwards in the first through hole is reserved at the position of the limiting part at the tail end of the first extending section, so that the positioning rod can be lifted upwards, and after the positioning rod is lifted, the inverted beard block can return to the second through hole along with the rotating closing of the door panel, so that the locking of the door panel is released, and the door panel can be smoothly rotated and closed.
Preferably, the bracket is arranged on any one connecting hinge between the door panel and the door support, and the connecting hinge is preferably arranged at the lower part.
Furthermore, the tail end of the first extension section is provided with a pin hole, the limiting component at the tail end of the first extension section comprises a gasket and a split pin, the split pin is arranged in the pin hole in a penetrating mode to prevent the first extension section from being separated from the first through hole, and the gasket is sleeved at the tail end of the first extension section and located between the positioning pin and the supporting plate.
Furthermore, first extension epirelief is equipped with the holding ring that is located the layer board top, the size of holding ring is greater than the size of through-hole one and can not pass through-hole one, and the holding ring is used for cooperating the layer board to support the first end of locating lever and prescribe a limit to the vertical position of first end.
Furthermore, the inverted beard blocks can be a plurality of inverted beard blocks which are arranged at intervals along the length direction of the positioning rod main body, and the interval between two adjacent inverted beard blocks can also be used as a locking groove for locking the vertical part of the clamping plate so as to adapt to different door plate opening angles; the shape, the structure and the size of each beard-inverting block can be set to be the same, and the shape, the structure and the size can also be set to be gradually increased along the direction close to the tail end of the positioning rod.
Preferably, the opening angle of the swing-open door panel is equal to 45-180 degrees.
The utility model discloses following beneficial effect has at least:
the utility model provides a dig rig platform automobile body soon and open self-align device of going up a car and open door soon, through the locating lever of the U-shaped structure of head and tail end all taking the elbow, at the rotatory in-process of opening of the rotatory door plant of opening, can rotate along with opening soon, set up one or more pieces of falling beard on the locating lever, when the door plant rotates to biggest angle or required angle, the piece of falling beard can be with the door plant locking, prevent that the door plant from taking place unnecessary and rotate by oneself, guarantee staff's construction safety. The utility model discloses a self-align device unblock is convenient, only needs to lift up the locating lever a bit, can remove the locking, and the operation is very convenient. The utility model discloses a reasonable structure and the position relation that sets up the three essential element of cardboard of locating lever, bracket, L shape can accomplish the locking and the unblock of door plant, and the part is few, and the structure is retrencied, and whole device need not to use the consumable part, long service life, and simple to operate, and installation and maintenance cost are few, and are with low costs, very practical.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a front view of the upper vehicle platform (with a door closed) of the rotary drilling rig according to the preferred embodiment of the present invention;
FIG. 2 is a view A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is an inward front view of the self-positioning device opened by the revolving drilling rig boarding platform body revolving door according to the preferred embodiment of the present invention when the door panel is closed;
FIG. 4 is a top view of the self-positioning device for opening the door of the upper platform body of the rotary drilling rig according to the preferred embodiment of the present invention when the door panel is in a state of being closed and opened to 90 degrees respectively;
FIG. 5 is an outward front view of the self-positioning device for the rotary drilling rig loading platform body to open the door when the door panel is opened to 90 degrees;
fig. 6 is a partial enlarged view of the utility model at the position i in fig. 3;
fig. 7 is an enlarged view of a portion of fig. 4 according to the present invention;
fig. 8 is an enlarged view of a portion of fig. 5 in accordance with the present invention;
fig. 9 is a positioning rod structure diagram of the self-positioning device for opening the door of the upper vehicle platform body of the rotary drilling rig according to the preferred embodiment of the present invention.
In the figure: 1-a locating rod, 10-a locating rod main body, 11-a first end head, 110-a first elbow, 111-a first extension section, 112-a pin hole, 113-a gasket, 114-a split pin, 115-a locating ring, 12-a second end head, 120-a second elbow, 121-a second extension section, 2-a reversed beard block, 3-a bracket, 31-a frame body, 32-a supporting plate, 321-a through hole I, 33-a bolt II, 4-a clamping plate, 41-a connecting part, 42-a vertical part, 43-a through hole II, 44-a bolt I, 5-a swing door, 51-a door support, 52-a door panel, 53-a connecting hinge, 6-a locking groove, 7-a key lock catch and 8-a cabinet body.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 1 to 9, the self-positioning device for opening the swing-open door of the upper vehicle platform body of the rotary drilling rig comprises a positioning rod 1, a reversed beard block 2, a bracket 3 and an L-shaped clamping plate 4, wherein the bracket is arranged on a door bracket 51 of the swing-open door 5 of the upper vehicle platform body cabinet body, and the clamping plate is arranged on a door plate 52 of the swing-open door of the upper vehicle platform body cabinet body;
the bracket comprises a bracket body 31 and a supporting plate 32 arranged on the bracket body, the plate surface of the supporting plate is parallel to the rotating plane of the door plate, and a first through hole 321 is formed in the supporting plate;
the L-shaped clamping plate comprises a connecting part 41 connected with the door panel and a vertical part 42 vertical to the door panel, the plate surface of the vertical part is arranged along the vertical direction, and the vertical part is provided with a second through hole 43; in this embodiment, the catch plate is fixed to the door panel by two bolts 44.
The positioning rod comprises a positioning rod main body 10 which is horizontally arranged in the middle, and a first end 11 and a second end 12 which are respectively arranged at the head end and the tail end of the positioning rod main body, and the positioning rod main body horizontally penetrates through the second through hole 43 of the vertical part;
the first end comprises an L-shaped first elbow 110 and a first extension section 111, the first elbow is continuously arranged along the vertical direction, the first extension section vertically penetrates through the first through hole of the supporting plate, the positioning rod can rotate by taking the first through hole as a center, and the tail end of the first extension section is provided with a limiting part for preventing the first extension section from being separated from the first through hole;
when the door plate of the swing door is opened and pulled to enable the door plate to rotate around the connecting hinge 53 on the door support, the clamping plate stirs the positioning rod through the through hole II to rotate together with the door plate, and enables the positioning rod to rotate by taking the through hole I as a center;
the second end comprises an L-shaped second elbow 120 and a second extension section 121, the second elbow is continuously arranged along the vertical direction, the vertical length of the second extension section is greater than the vertical size of the second through hole, and the second extension section is used for preventing the tail end of the positioning rod from falling off from the second through hole when the positioning rod rotates to the maximum angle along with the opening of the door panel;
the position, close to the second end, of the positioning rod main body is convexly provided with the inverted beard block 2 along the vertical downward direction, the inverted beard block is arranged to be in a wedge-shaped structure, the vertical size of the inverted beard block is gradually increased along the direction close to the tail end of the positioning rod, a smooth transition is arranged between the initial position, farthest away from the tail end of the positioning rod, of the inverted beard block and the positioning rod main body, so that the inverted beard block can smoothly enter the through hole II, the vertical size of the through hole II is larger than the sum of the vertical sizes of the inverted beard block and the positioning rod main body at the position of the vertical maximum size of the inverted beard block, and the inverted;
the horizontal interval is kept between must piece and the second extension to the contrary piece, and this horizontal interval is as the locking groove 6 of locking the perpendicular part of cardboard, and the length of registration lever and the position of must piece are set up to satisfying: when the door plate is rotated to be opened to a certain required angle, the vertical part of the clamping plate arranged on the door plate is just clamped in the locking groove, so that the self-positioning and locking of the door plate are realized;
the adjusting distance enabling the first extending section to move upwards in the first through hole is reserved at the position of the limiting part at the tail end of the first extending section, so that the positioning rod can be lifted upwards, and after the positioning rod is lifted, the inverted beard block can return to the second through hole along with the rotating closing of the door panel, so that the locking of the door panel is released, and the door panel can be smoothly rotated and closed.
Referring to fig. 2 and 7, in the embodiment, an upper connecting hinge 53 and a lower connecting hinge 53 are arranged between the door panel and the door support, the frame body of the bracket is fixed on the lower connecting hinge through a second bolt 33, and the second bolt is also a connecting bolt between the connecting hinge and the door support.
Referring to fig. 9, the end of the first extending section at the head end of the positioning rod is provided with a pin hole 112, referring to fig. 8, the limiting component at the end of the first extending section comprises a gasket 113 and a cotter pin 114, the gasket 113 and the cotter pin are located below the first through hole, the cotter pin is inserted into the pin hole to prevent the first extending section from being separated from the first through hole, and the gasket is sleeved at the end of the first extending section and located between the positioning pin and the supporting plate.
The welding is provided with the holding ring 115 that is located the layer board top on the first extension, the outer lane radial dimension of holding ring is greater than the size of through-hole one and can not be through-hole one, and the holding ring is used for cooperating the layer board to support the first end of locating lever and inject the vertical position of first end.
The working process and the principle of the self-positioning device for opening the door of the upper vehicle platform of the rotary drilling rig by rotating the vehicle body are as follows:
when the door is opened, the key lock catch 7 on the door panel is opened, the door panel is pulled, the door panel rotates reversely (the reverse rotation is defined as the rotation in the direction far away from the cabinet body 8) around the connecting hinge 53, the positioning rod also rotates reversely with the first through hole as the center, in the rotating process, under the limit of the second through hole, the vertical part of the clamping plate gradually slides to be close to the inverted beard block along the positioning rod main body, when the door panel is opened to a certain required angle (the angle is 90 degrees in the embodiment), the inverted beard block completely passes through the second through hole, under the self gravity action of the positioning rod, the tail end swings downwards, the wall of the second through hole supports the position of the positioning rod between the second extending section and the inverted beard block, at the moment, if the door panel rotates unnecessarily reversely, the vertical part of the clamping plate can be blocked by the second extending section, if the door panel rotates unnecessarily, the vertical part can, make the vertical portion of cardboard promptly to be blocked in the locking groove, realized the door plant locking promptly.
When the door is closed, the positioning rod is only required to be lifted upwards, so that the inverted beard block enters the second through hole again, the door can be smoothly closed, and the door is very convenient and practical.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (7)
1. A rotary drilling rig getting-on platform car body swing-open door opening self-positioning device is characterized by comprising a positioning rod (1), a reversed beard block (2), a bracket (3) and an L-shaped clamping plate (4), wherein the bracket is arranged on a door support (51) of a swing-open door (5) of a getting-on platform car body cabinet body, and the clamping plate is arranged on a door plate (52) of the swing-open door of the getting-on platform car body cabinet body;
the bracket comprises a bracket body (31) and a supporting plate (32) arranged on the bracket body, the plate surface of the supporting plate is parallel to the rotating plane of the door plate, and a first through hole (321) is formed in the supporting plate;
the L-shaped clamping plate comprises a connecting part (41) connected with the door plate and a vertical part (42) perpendicular to the door plate, the plate surface of the vertical part is arranged along the vertical direction, and a second through hole (43) is formed in the vertical part;
the positioning rod comprises a positioning rod main body (10) which is horizontally arranged in the middle, and a first end head (11) and a second end head (12) which are respectively arranged at the head end and the tail end of the positioning rod main body, and the positioning rod main body horizontally penetrates through a second through hole (43) of the vertical part;
the first end comprises an L-shaped first elbow (110) and a first extension section (111) which is continuously arranged along the vertical direction of the first elbow, the first extension section vertically penetrates through the first through hole of the supporting plate, the positioning rod can rotate by taking the first through hole as a center, and the tail end of the first extension section is provided with a limiting part for preventing the first extension section from being separated from the first through hole;
when the door plate of the swing door is opened and pulled to enable the door plate to rotate around a connecting hinge (53) on the door support, the clamping plate stirs the positioning rod through the through hole II to rotate together with the door plate, and enables the positioning rod to rotate by taking the through hole I as a center;
the second end comprises an L-shaped second elbow (120) and a second extension section (121) which is continuously arranged along the vertical direction of the second elbow, the vertical length of the second extension section is greater than the vertical size of the second through hole, and the second extension section is used for preventing the tail end of the positioning rod from falling off from the second through hole when the positioning rod rotates to the maximum angle along with the opening of the door panel;
the position, close to the second end, of the positioning rod main body is convexly provided with the inverted whisker block (2) in a vertically downward direction, the inverted whisker block is arranged to be of a wedge-shaped structure, the vertical size of the inverted whisker block is gradually increased along the direction close to the second end of the positioning rod, the starting position, farthest away from the second end of the positioning rod, of the inverted whisker block is smoothly transited with the positioning rod main body, so that the inverted whisker block can smoothly enter the second through hole, and the vertical size of the second through hole is larger than the sum of the vertical sizes of the inverted whisker block and the positioning rod main body at the position of the maximum vertical size of the inverted whisker block, so that the inverted whisker block can pass through the second through hole;
the horizontal interval is kept between must piece and the second extension section to fall, and this horizontal interval is as locking groove (6) of locking the vertical part of cardboard, and the length of registration lever and the position of the must piece of falling set up to satisfy: when the door plate is rotated to be opened to a certain angle, the vertical part of the clamping plate arranged on the door plate is just clamped in the locking groove, so that the self-positioning and locking of the door plate at the current opening angle are realized;
the adjusting distance enabling the first extending section to move upwards in the first through hole is reserved at the position of the limiting part at the tail end of the first extending section, so that the positioning rod can be lifted upwards, and after the positioning rod is lifted, the inverted beard block can return to the second through hole along with the rotating closing of the door panel, so that the locking of the door panel is released, and the door panel can be smoothly rotated and closed.
2. The self-positioning device for the rotary-opening door of the upper vehicle platform body of the rotary drilling rig as claimed in claim 1, wherein the bracket is arranged on any one of the connecting hinges between the door panel and the door support.
3. The self-positioning device for opening the swing-open door of the upper vehicle platform body of the rotary drilling rig according to claim 2, wherein the connecting hinge is a connecting hinge at a lower position.
4. The self-positioning device for opening the door of the rotary drilling rig loading platform body in the swinging mode according to claim 1, wherein a pin hole (112) is formed in the tail end of the first extending section, the limiting component at the tail end of the first extending section comprises a gasket (113) and a split pin (114), the split pin is arranged in the pin hole in a penetrating mode to prevent the first extending section from being separated from the first through hole, and the gasket is sleeved at the tail end of the first extending section and located between the positioning pin and the supporting plate.
5. The self-positioning device for the rotary-opening door and the opening of the upper vehicle platform body of the rotary drilling rig according to claim 1 is characterized in that a positioning ring (115) located above the supporting plate is convexly arranged on the first extending section, the size of the positioning ring is larger than that of the first through hole and cannot pass through the first through hole, and the positioning ring is used for being matched with the supporting plate to support the first end of the positioning rod and limit the vertical position of the first end.
6. The self-positioning device for the swing-open door of the vehicle body of the boarding platform of the rotary drilling rig as claimed in claim 1, wherein the opening angle of the swing-open door plate is equal to 45-180 °.
7. The self-positioning device for opening the swing door of the upper vehicle platform body of the rotary drilling rig according to any one of claims 1 to 6, wherein the inverted whisker blocks are arranged at intervals along the length direction of the positioning rod main body, and the interval between two adjacent inverted whisker blocks is also used as a locking groove for locking the vertical part of the clamping plate so as to adapt to different door panel opening angles; the shape, structure and size of each beard-inverting block can be set to be the same, or the shape, structure and size can be set to be the same along the direction close to the tail end of the positioning rod, and the vertical maximum size of each beard-inverting block is gradually increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922383734.3U CN211342280U (en) | 2019-12-26 | 2019-12-26 | Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922383734.3U CN211342280U (en) | 2019-12-26 | 2019-12-26 | Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211342280U true CN211342280U (en) | 2020-08-25 |
Family
ID=72094292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922383734.3U Withdrawn - After Issue CN211342280U (en) | 2019-12-26 | 2019-12-26 | Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211342280U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939337A (en) * | 2019-12-26 | 2020-03-31 | 恒天九五重工有限公司 | Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing |
-
2019
- 2019-12-26 CN CN201922383734.3U patent/CN211342280U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939337A (en) * | 2019-12-26 | 2020-03-31 | 恒天九五重工有限公司 | Self-positioning device for opening door of upper vehicle platform body of rotary drilling rig by screwing |
| CN110939337B (en) * | 2019-12-26 | 2024-04-26 | 恒天九五重工有限公司 | Self-positioning device for opening rotary door of loading platform body of rotary drilling rig |
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Granted publication date: 20200825 Effective date of abandoning: 20240426 |
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| AV01 | Patent right actively abandoned |
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