CN201614243U - Moment limiting system of caterpillar crane - Google Patents
Moment limiting system of caterpillar crane Download PDFInfo
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- CN201614243U CN201614243U CN2010200041225U CN201020004122U CN201614243U CN 201614243 U CN201614243 U CN 201614243U CN 2010200041225 U CN2010200041225 U CN 2010200041225U CN 201020004122 U CN201020004122 U CN 201020004122U CN 201614243 U CN201614243 U CN 201614243U
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Abstract
A moment limiting system of a caterpillar crane comprises a sensor portion, a display portion and a main control box connected between the sensor portion and the display portion. The main control box is a modular independent board card structure, and a main controller with a crane moment processing system inside is arranged inside the main control box. The crane moment processing system can obtain accurate crane limiting moment and protecting signals according to mathematical models and load curved lines. Peripheral modules can be randomly expanded by utilizing the main controller as a core, thereby achieving the purpose of strong expandability, flexible use, convenient installation and maintenance, fine universality, high reliability and more accurate and safer control.
Description
Technical field
The utility model relates to a kind of moment limiting system, relates to a kind of moment limiting system that is applicable to crawler crane specifically.
Background technology
Moment limiting system on the crawler crane can prevent effectively that hoisting crane from owing to the degree of safety of tumbling and improving crane job that overload causes, being the safety control of crawler crane indispensability.Along with the development of large-tonnage crawler crane, it is complicated that the math modeling of crawler crane, operating mode, control algorithm become, and therefore, also requires more and more higher to arithmetic capability, the communication capacity of limiter of moment.Traditional crawler crane moment limiting system, for example a kind of hoisting crane of providing of Chinese patent CN95200573 is with intelligent liquid crystal limiter of moment; The weight limits device that a kind of elevator machinery that a kind of microcomputer full screen limiter of moment that Chinese patent CN94237251 provides and Chinese patent CN200820205769 provide is used, all be that the employing micro controller system is a core controller, arithmetic capability is lower, extensibility is relatively poor, safeguard inconvenient, and man-machine interface is unfriendly etc., the drawbacks limit that these are intrinsic the range of use of limiter of moment, can not satisfy the growing demand of crawler crane.
Summary of the invention
The purpose of this utility model provides a kind of crawler crane moment limiting system, and by a main control box, it is strong to reach extendability, easy to maintenance, good and the more accurate and safety of control of commonality.
The utility model to achieve the above object, the technical scheme of being taked is: a kind of crawler crane moment limiting system is provided, and it comprises Sensor section, the display part and be connected in Sensor section and the display part between main control box.Described main control box is a modularization independent plate card structure, comprises in the main control box that inside is equipped with the master controller of hoisting crane moment disposal system.
The remarkable benefit of crawler crane moment limiting system of the present utility model.
● as the structure of above-mentioned the utility model crawler crane moment limiting system, because main control box is a modularization independent plate card structure.Its master controller and constitute an independent plate respectively with its bonded assembly module and be placed in (or insert) main control box, main control box just is equivalent to a built-in industrial control machine platform, so being core with the master controller, it can arbitrarily expand peripheral module, it is strong to reach extendability, use flexibly, installation and maintenance is convenient, the purpose that commonality is good.
● as above-mentioned structure, the utility model is built-in with hoisting crane moment disposal system because comprise the master controller that places in the main control box.The restraining moment and the guard signal that obtain accurate hoisting crane according to the math modeling and the load curve of hoisting crane by hoisting crane moment disposal system.Therefore, moment limiting system reliability height of the present utility model, arithmetic capability is strong, can satisfy bad working environment and complicated computation requirement.Reached more accurate, the safer purpose of control.
● as above-mentioned structure, in the display part, available man-machine interface shows moment percentum (percent value of actual load and rated load) in real time, and can be on man-machine interface shows different hazard levels with color such as green, yellow, red, and is simple and clear directly perceived; Can also be by the various duty parameters of man-machine interface centralized displaying crawler crane, for example information such as length of boom, boom angle, maximum height of lift, hoisting crane work amplitude, rated load weight and actual hoisting capacity, actual measurement moment facilitates consultation.
● as the structure of above-mentioned the utility model crawler crane moment limiting system, can expand the CAN bus communication module in the main control box, can conveniently call the controlled variable of other controller on the hoisting crane by the CAN bus on the crawler crane, other controller also can call the measured data of the utility model Sensor section (as jib angular transducer and luffing pulley pulling force sensor) on the hoisting crane.
● as the structure of above-mentioned the utility model crawler crane moment limiting system; the Sensor section of on hoisting crane, installing; for example jib angular transducer and luffing pulley pulling force sensor are measured the pulling force of the jib elevation angle and lift heavy; hoisting crane moment disposal system in the master controller goes out the actual load of crawler crane by the crawler crane calculated with mathematical model that sets in advance; and the actual load that calculates and the rated load that sets in advance compared; when actual load surpasses rated load; master controller output overload protection signal, and the moment of restriction crawler crane.Accomplished that real-time control is accurate, the requirement of being convenient to debug.
Description of drawings
Fig. 1 is the structural representation of the utility model crawler crane moment limiting system;
Fig. 2 is the structural representation of the utility model crawler crane moment limiting system one embodiment;
Fig. 3 is the structural representation of hoisting crane moment disposal system one embodiment in the interior master controller of main control box in the utility model crawler crane moment limiting system;
Fig. 4 is that the utility model crawler crane moment limiting system is used for the example structure scheme drawing on the hoisting crane;
Fig. 5 is the diagram of circuit of hoisting crane moment disposal system one embodiment in the master controller in the described main control box.
The specific embodiment
Further specify the architectural feature of the utility model crawler crane moment limiting system below in conjunction with drawings and Examples.
Fig. 1, Fig. 2 are the structural representations of the utility model crawler crane moment limiting system one embodiment.As shown in Figure 1, crawler crane moment limiting system of the present utility model it comprise three parts: Sensor section 1, display part 3 and be connected in Sensor section 1 and display part 3 between main control box 3.Described main control box 3 is modularization independent plate card structures, comprises in the main control box 3 that inside is equipped with the master controller 21 of hoisting crane moment disposal system 211.
As shown in Figure 2, in the present embodiment, also comprise analogue to digital conversion (A/D) module 23, recording storage module 28, CAN bus communication module 27, output module (I/O) 24, vision signal modular converter 25, keyboard signal modular converter 26 that is connected with master controller 21 and the signal condition amplification module 22 that is connected with analogue to digital conversion (A/D) module 23 input ends in the described main control box 2.Described master controller 21 and each module that is connected with master controller 21 constitute respectively one independently integrated circuit board place in (or inserting in) main control box 2.
Described recording storage module 28 can be stored information such as the working condition, historic records of measured working parameter of moment limiting system when work, system automatically, being convenient to the operator checks at any time, when having an accident, also can be according to the history run information analysis accident causation of record in the recording storage module 28.
As shown in Figure 2, in the present embodiment, described Sensor section 1 comprises jib angular transducer 11 and luffing pulley pulling force sensor 12.In the present embodiment, jib angular transducer 11 is connected with master controller 21 by shielded cable respectively with luffing pulley pulling force sensor 12.Structure as Fig. 2, when the utility model crawler crane moment limiting system is worked, jib angular transducer 11, luffing pulley pulling force sensor 12 record the jib elevation angle and the luffing pulley pulling force on the crawler crane respectively, the described analog signal that two sensors records with by analog-to-digital conversion module 23 analog signal conversion being become digital signal after the signal processing and amplifying, sends master controller 21 through signal condition amplification module 22 to; Hoisting crane moment disposal system 211 in the master controller 21 is carried out calculation process according to the math modeling of the crawler crane that sets in advance and the rated load curve of the different operating modes of corresponding crawler crane; when actual load exceeds the rated load of crawler crane boom; output overload protection signal carries out sound and light alarm by output module 24 to annunciator; and corresponding moment limiting mechanism on the control hoisting crane, Control arm booster square.
As shown in Figure 2, in the present embodiment, described display part comprises man-machine interface 32, read-out 31 and button 33.In the present embodiment, described man-machine interface 32 is connected with master controller 21 by the LVDS/SKB signal wire (SW), and the LVDS/SKB signal wire (SW) can be used and the long range signals transmission, to satisfy the hoisting crane matching requirements.In the present embodiment, man-machine interface 32 display panels adopt the single width picture to concentrate monitoring current operating condition, duty parameter and alarm message, avoid too much picture to switch, show different hoisting crane scheme drawings at different operating modes, adopt red, yellow, green colour barcode to show actual moment and rated moment percentum.Can enter function interfaces such as operating mode setting, debugging, trouble diagnosing by the control button on the click man-machine interface 32 and carry out the function corresponding operation.
As shown in Figure 2, in the present embodiment, the master controller 21 in the described main control box 2 communicates by the upper computer 6 on CAN bus communication module 27 and the hoisting crane.Master controller 21 carries out data communication by other controller on CAN bus communication module 27 and the crawler crane CAN bus, conveniently call the controlled variable in other controller on the hoisting crane, or the parameter (angle, pulling force etc.) that native system records shared by CAN bus communication module 27 call to other controller.
In the present embodiment, described and master controller 21 bonded assembly output modules 24 are relay (or R/G).As shown in Figure 2, output module 24 is connected with annunciator 4 with the step switch 5 of hoisting crane.Output on the output module 24 when master controller 21 has control signal, when making relay with the closing of contact that step switch on the hoisting crane is connected, impel the step switch on the hoisting crane to open, hoisting crane begins action; When alerting signal, by the relay on the output module 24 and the annunciator bonded assembly closing of contact, annunciator sends alerting signal.
In the present embodiment, described master controller 21 adopts by Shanghai and contains the PC/104 built-in industrial control machine SCM-7020 that Boke's skill Co., Ltd provides.It is a kind of controller of expanding peripheral module.As shown in Figure 1, the signal condition amplifying unit module 22 that is connecting analogue to digital conversion (A/D) module 23, recording storage module 28, CAN bus communication module 27, output module 24, vision signal modular converter 25, keyboard signal modular converter 26 in its periphery and be connected with analog-to-digital conversion module 23 input ends.
Fig. 3 is the structural representation that places hoisting crane moment disposal system 211 1 embodiment in the master controller 21.As shown in Figure 3, the described master controller 21 interior hoisting crane moment disposal systems 211 that place comprise data acquisition detection sub-module 2111, the math modeling that data handing submodule 2112 that is connected with data acquisition detection sub-module 2111 and storage inside have hoisting crane and the store management submodule 2113 of load curve, the communication system submodule 2114 that is connected with store management submodule 2113 with data handing submodule 2112.The workflow of described hoisting crane moment disposal system 211 as shown in Figure 5.
Fig. 4 is that the utility model crawler crane moment limiting system is used for the embodiment scheme drawing on the hoisting crane.As shown in Figure 4, jib angular transducer 11 is installed on the jib 7 of hoisting crane, measures the elevation angle of jib; Luffing pulley pulling force sensor 12 is installed in the pulling force of measuring lift heavy on the intermediate pulley seat 8 in the luffing transmission of hoisting crane indirectly; Main control box 2 is placed in the hoisting crane compartment 9, and the man-machine interface 33 in the display part 3 is connected by LVDS/SKB signal wire (SW) and main control box 2 interior master controllers 21.
As shown in Figure 3, concerning the principal arm operating mode of what hoisting crane, the store management submodule 2113 of the hoisting crane moment disposal system 211 in master controller 21 is built-in with math modeling and is:
In above-mentioned (1) formula, G is a principal arm weight, and Q is an assumed (specified) load, n
1Be lifting hook pulley group multiplying power, n
2Be the luffing pulley block ratio, f is surveyed data (pulling force), L by pulling force sensor
1Be the distance of principal arm center of gravity line to hinge, L
2Be swinging radius, H
1For the luffing stay cord to hinge distance, H
2For hoisting rope arrives the hinge distance.
Under the principal arm operating mode:
As shown in Figure 3, data acquisition detection sub-module 2111 is behind luffing pulley pulling force sensor 12 image data f (pulling force), flow to data handing submodule 2112, data handing submodule 2112 reads the parameter of principal arm operating mode and transfers above-mentioned math modeling formula (1) in the store management submodule 2113 and draws assumed (specified) load Q.
Because the crawler crane math modeling of formula (1) is only considered the corresponding relation of the jib elevation angle, lift heavy pulling force and actual load under perfect condition, a lot of hypothesis have been made for above-mentioned crawler crane math modeling, for example ignored the influence of raising line and luffing rope leading sheave diameter, jib is assumed to be rigid body, and ignored the influence of the friction force of hinge, therefore, in order to make the actual load that calculates more accurate, also need the actual load correction function of crawler crane math modeling is being set.
The form of described actual load correction function is:
Q
1＝f(a)*Q+ΔQ............(2)
In above-mentioned (2) formula, Q
1Be revised actual load, f (a) is the correction function at the jib elevation angle, and Q is the actual load before revising, and Δ Q is hoisting crane fishhook and the jib influence value to actual load.
By correction function Q
1=f (a) * Q+ Δ Q can get actual load to the assumed (specified) load correction.
(Q
1Be actual load, f (a) is the correction function at the jib elevation angle, and Q is an assumed (specified) load, and Δ Q is fishhook and the jib influence value to actual load)
For example: for the principal arm operating mode, 29 meters principal arms, the main hook operation, test case is as shown in table 1:
Table 1
| Test counterweight (t) | Assumed (specified) load Q before revising | Revise back actual load Q 1 | Rated load (t) | Angles of display (degree) | Actual margin (m) | Demonstration amplitude (m) | Synthesis precision (%) |
| 85.5 | 86.3 | 84 | 191.7 | 81.4 | 6.98 | 7.03 | 1.06 |
| 85.5 | 87.5 | 86 | 119.8 | 74.4 | 10.3 | 10.43 | -1.82 |
| 85.5 | 88.2 | 87.7 | 90.6 | 66.6 | 13.9 | 14.07 | -3.69 |
| 33 | 35.3 | 33.5 | 90.5 | 66.6 | 13.9 | 14.09 | -2.82 |
| 33 | 35.7 | 33.9 | 68.5 | 56.8 | 18.15 | 18.35 | -3.72 |
| 33 | 36.0 | 33.6 | 48.2 | 42.1 | 23.6 | 23.84 | -2.77 |
| Test counterweight (t) | Assumed (specified) load Q before revising | Revise back actual load Q 1 | Rated load (t) | Angles of display (degree) | Actual margin (m) | Demonstration amplitude (m) | Synthesis precision (%) |
| 33 | 36.8 | 33.5 | 41.1 | 31.2 | 26.98 | 26.95 | -1.38 |
Table 1 is that hoisting crane moment disposal system reads rated load under the current working according to the principal arm present located operating mode of crawler crane on the rated load curve that is provided with in the master controller; and calculate the ratio of actual load and rated load; if the ratio of actual load and rated load surpasses predefined safety value; output protection signal then, the moment of restriction crawler crane.
In the table 1, when test counterweight (t) is test the utility model crawler crane moment limiting system, the actual load the when weight of slinging on the hoisting crane principal arm is test; Assumed (specified) load Q is with above-mentioned formula (1) result calculated before revising; Revise back actual load Q
1Be result with above-mentioned correction function formula (2) gained; Rated load (t) is for being stored in the numerical value that reads on the rated load curve in the store management submodule 2113; The current principal arm residing elevation angle of angles of display (degree) on man-machine interface, showing; Actual margin (m) is the amplitude of current hoisting crane principal arm reality; The amplitude of demonstration amplitude (m) for showing on the man-machine interface; Synthesis precision (%) is actual load Q
1And the percentum of difference between the actual load one test counterweight (t).
Crawler crane moment limiting system survey precision of the present utility model as can be known is than higher on the synthesis precision from above-mentioned table 1 (%), and under the common situation, precision reaches 5% and just meets the requirements, and the precision of table 1 is all less than 2%.
Explanation from table 1, above-mentioned adding correction function formula (2) is very correct.As above-mentioned, because the math modeling formula (1) of crawler crane is only considered the corresponding relation of the jib elevation angle, lift heavy pulling force and actual load under perfect condition, therefore a lot of hypothesis on the crawler crane math modeling, have been made, for example ignored the influence of raising line and luffing rope leading sheave diameter, jib is assumed to be rigid body, and has ignored the influence etc. of the friction force of hinge.Therefore, in order to make the actual load that calculates more accurate, so the above-mentioned actual load correction function that the crawler crane math modeling also is set in master controller is very important.
Accordingly, hoisting crane moment disposal system is also carried out the numerical value correction according to the actual load correction function to the crawler crane actual load that the crawler crane calculated with mathematical model goes out.
As shown in table 1, in the present embodiment, the mode of measuring the lift heavy pulling force is to measure the pulling force that hoisting crane becomes the auxiliary pulley group indirectly by luffing pulley pulling force sensor, hoisting crane moment disposal system by master controller converts the lift heavy pulling force to again, in conjunction with lift heavy pulling force that records indirectly and jib elevation data, hoisting crane moment disposal system is according to the crawler crane math modeling, calculate the actual load of hoisting crane in real time, and the actual load that calculates is revised according to the actual load correction function, as above-mentioned, the form of described actual load correction function is Q
1=f (a) * Q+ Δ Q, wherein, Q
1Be revised actual load, f (a) is the correction function at the jib elevation angle, and Q is the actual load before revising, and Δ Q is hoisting crane fishhook and the jib influence value to actual load.In order to obtain comparatively accurate Δ Q, when system debug, under the empty hook-shaped attitude of crawler crane, become secondary sampling, obtain the normal data sampling point, generate the interpolation table of an empty hook weight.The data format of interpolation table is stored in the store management submodule by the form of operating mode, angle, actual weight, coefficient of correction.During the crawler crane lift heavy, the hoisting crane moment disposal system of master controller is revised in real time by the interpolation of search jib respective amplitude, thereby calculates accurate Δ Q, makes revised actual load Q
1Also more accurate.By above-mentioned correction; the calculating of hoisting crane moment disposal system is through the ratio of revised actual load and the pairing rated load of current working in the master controller; and compare with the safety value that sets in advance; if this ratio surpasses safety value; the guard signal that then goes out to overload is reported to the police and is controlled actuating unit restraining moment on the hoisting crane.
After master controller powered on, hoisting crane moment disposal system was at first carried out the diagnosis and the self check of hardware, finished to output control module the detection of recording storage module and other module interface circuit.When hardware breaks down, output alarm information.Parameter initialization is partly finished the initial work of communications parameter, input/output signal, work state information etc.The data acquisition detection sub-module of hoisting crane moment disposal system is finished reading jib angular transducer and luffing pulley pulling force sensor, be input in the data handing submodule and import store management submodule stored, the data handing submodule is handled the filtering and the average of input information, set up the corresponding relation between sampled value and the observed reading, and the jib elevation angle and the numerical value of stay cord pulling force, the math modeling of hoisting crane and correction formula calculating actual load by collecting.
Fig. 5 is the diagram of circuit of hoisting crane moment disposal system one embodiment in the master controller in the described main control box.
As shown in Figure 5, the workflow of hoisting crane moment disposal system is in the master controller:
The 1st step powered on after the start, and at first, hoisting crane moment disposal system is finished the diagnosis and the self check of hardware, initiating hardware port, distribution system internal memory;
In the 2nd step, the data acquisition detection sub-module reads the performance structure parameter (as: geometrical structure parameters such as the brachium of the following hoisting crane of current working configuration, suspension hook multiplying power, center of gravity, auxiliary angle etc.) that is stored in the crawler crane in the recording storage module 28; Read the spacing parameter of safety, as the safe ratio of actual load and rated load, the spacing angle of jib safety etc.; Read the data of jib angular transducer 11 and luffing pulley pulling force sensor 12, be input in data handing submodule 2112 and the store management submodule 2113 behind the line data pretreatment of going forward side by side (as: filtering and average are handled);
The 3rd step, carry out fault, spacing inspection, check that safety is spacing, sensor is fine or not and other manual operation mistake etc., as unusual circumstance output alarm then;
The 4th step, obtain rated load, data handing submodule 2112 is according to above-mentioned data, the reading of the reading of jib angular transducer, performance structure parameter, load curve, from store management submodule 2113, call math modeling and correction function, calculate rated load;
The 5th step, actual load calculates, reading, performance structure parameter and crawler crane calculated with mathematical model according to jib angular transducer, luffing pulley pulling force sensor go out actual load, and according to the actual load correction function actual load that calculates are revised;
The 6th goes on foot, and tries to achieve the ratio of revised actual load and rated load;
In the 7th step, overload is judged, the ratio that aforementioned calculation goes out is compared with safety value, if overload occurs, then by communication system submodule output alarm signal.
Claims (6)
1. crawler crane moment limiting system, comprise Sensor section and display part, it is characterized in that comprising the main control box that is connected between Sensor section and the display part, described main control box is a modularization independent plate card structure, comprises in the main control box that inside is equipped with the master controller of hoisting crane moment disposal system.
2. crawler crane moment limiting system as claimed in claim 1 is characterized in that also comprising in the described main control box analog-to-digital conversion module, recording storage module, CAN bus communication module, output module, vision signal modular converter, keyboard signal modular converter that is connected with master controller and the signal condition amplification module that is connected with the analog-to-digital conversion module input end.
3. crawler crane moment limiting system as claimed in claim 1 or 2, it is characterized in that described master controller and each module that is connected with master controller constitute respectively one independently integrated circuit board place in the main control box.
4. crawler crane moment limiting system as claimed in claim 1, it is characterized in that the described interior hoisting crane moment disposal system of master controller that places comprises the data acquisition detection sub-module, data processing module that is connected with the data acquisition detection sub-module and the inner math modeling of hoisting crane and the store management submodule of load curve of being equipped with, the communication system submodule that is connected with the store management submodule with data processing module.
5. crawler crane moment limiting system as claimed in claim 1 is characterized in that described Sensor section comprises jib angular transducer and luffing pulley pulling force sensor.
6. crawler crane moment limiting system as claimed in claim 1 is characterized in that described display part comprises man-machine interface, button and read-out.
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|---|---|---|---|
| CN2010200041225U CN201614243U (en) | 2010-01-07 | 2010-01-07 | Moment limiting system of caterpillar crane |
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|---|---|---|---|
| CN2010200041225U CN201614243U (en) | 2010-01-07 | 2010-01-07 | Moment limiting system of caterpillar crane |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259799A (en) * | 2011-05-05 | 2011-11-30 | 长沙中联重工科技发展股份有限公司 | Crawler crane installation torque control method and device, and crawler crane |
| CN104192714A (en) * | 2014-07-30 | 2014-12-10 | 徐州重型机械有限公司 | Method for intelligent human-computer interaction hoisting operation of crane and moment limiter applied to operation |
| CN104495658A (en) * | 2014-12-31 | 2015-04-08 | 中联重科股份有限公司 | Debugging method, device and system for moment limiter of crane |
| CN109250634A (en) * | 2018-09-30 | 2019-01-22 | 珠海云洲智能科技有限公司 | A kind of winch gear |
| CN113734977A (en) * | 2021-08-27 | 2021-12-03 | 浙江三一装备有限公司 | Crane lifting control method and system and crane |
-
2010
- 2010-01-07 CN CN2010200041225U patent/CN201614243U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259799A (en) * | 2011-05-05 | 2011-11-30 | 长沙中联重工科技发展股份有限公司 | Crawler crane installation torque control method and device, and crawler crane |
| CN104192714A (en) * | 2014-07-30 | 2014-12-10 | 徐州重型机械有限公司 | Method for intelligent human-computer interaction hoisting operation of crane and moment limiter applied to operation |
| CN104192714B (en) * | 2014-07-30 | 2016-04-27 | 徐州重型机械有限公司 | For method and the limiter of moment of hoisting crane man-machine interaction lifting intellectualized operation |
| CN104495658A (en) * | 2014-12-31 | 2015-04-08 | 中联重科股份有限公司 | Debugging method, device and system for moment limiter of crane |
| CN109250634A (en) * | 2018-09-30 | 2019-01-22 | 珠海云洲智能科技有限公司 | A kind of winch gear |
| CN113734977A (en) * | 2021-08-27 | 2021-12-03 | 浙江三一装备有限公司 | Crane lifting control method and system and crane |
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Effective date of registration: 20110402 Address after: 215300 East Ring Road, Kunshan Development Zone, Jiangsu Patentee after: Kunshan Sany Machinery Co., Ltd. Address before: 201200 Shanghai City Sichuan Road Pudong New Area Chuansha economic Park No. 319 Patentee before: Shanghai Sany Technology Co., Ltd. |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20101027 Effective date of abandoning: 20110915 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |