CN113174817B - Telescopic screed, paver and telescopic control method - Google Patents
Telescopic screed, paver and telescopic control method Download PDFInfo
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- CN113174817B CN113174817B CN202110481016.9A CN202110481016A CN113174817B CN 113174817 B CN113174817 B CN 113174817B CN 202110481016 A CN202110481016 A CN 202110481016A CN 113174817 B CN113174817 B CN 113174817B
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- telescopic
- screed
- section screed
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
Abstract
The invention discloses a telescopic screed plate, a paver and a telescopic control method in the technical field of pavement construction machinery, wherein the telescopic screed plate comprises a basic section screed plate, a first telescopic section screed plate, a second telescopic section screed plate, a first telescopic driver and a second telescopic driver, the first telescopic driver is used for driving the first telescopic section screed plate to transversely telescopic relative to the basic section screed plate, the second telescopic driver is used for driving the second telescopic section screed plate to transversely telescopic relative to the first telescopic section screed plate, and the telescopic screed plate further comprises a control device, wherein the control device is used for detecting the telescopic states of the first telescopic section screed plate and the second telescopic section screed plate and controlling the actions of the first telescopic driver and the second telescopic driver; the invention can make the screed plate in a better working state, reduce the deformation generated when the screed plate stretches and contracts, thereby improving the paving quality.
Description
Technical Field
The invention relates to a telescopic screed, a paver and a telescopic control method, and belongs to the technical field of pavement construction machinery.
Background
Screed is a very important working device on pavers for compacting, screeding and shaping the road surface, often with devices such as screed plate carriers, base plates, vibrating mechanisms, etc. Screeds can be generally classified into telescopic screeds and split screeds according to the manner in which the width is expanded. The assembly screed realizes different working widths by assembling the lengthened sections with different widths through the fasteners, and the telescopic screed can conveniently change the working width by enabling the telescopic section screed to be telescopic transversely (namely perpendicular to the advancing direction of the paver) relative to the base section screed.
The most common telescopic screeds today have a width of about twice the base width when fully extended, said screeds comprising a base section screed and left and right telescopic section screeds arranged on the front or rear side of the base section screed and being telescopic laterally with respect to the base section screed, and a telescopic screed comprising a base section screed and a first telescopic section screed arranged substantially symmetrically left and right, a second telescopic screed, the first telescopic section screed being telescopic laterally with respect to the base section screed, the second telescopic section screed being telescopic laterally with respect to the first telescopic section screed, whereby the width when fully extended may approach or reach 3 times the base width, a specific embodiment of such screeds being disclosed in the patent application CN202011298184.6 and CN 202011302045.6.
In the prior art, when the width of the screed needs to be changed by the telescopic screed, in particular, whether the first telescopic screed is telescopic transversely relative to the base section screed or the second telescopic screed is telescopic transversely relative to the first telescopic screed is completely random, however, such random telescopic manner is disadvantageous for exerting screed performance and improving paving quality, as the telescopic screed shown in fig. 1, the first telescopic screed/the second telescopic screed are typically connected to the base section screed/the first telescopic screed by a first/second telescopic guiding mechanism (not shown in the figure) so as to realize the telescopic transversely; according to research, the deformation of the telescopic ironing plate is generated by the telescopic guide mechanism to a great extent, and when the second telescopic ironing plate stretches out, the first telescopic guide mechanism and the second telescopic guide mechanism bear load and deform no matter whether the first telescopic ironing plate stretches out or not; when the second telescopic section screed is not extended, only the first telescopic section screed is extended, and only the first telescopic guide mechanism bears the load and deforms; that is, the second telescoping section screed extension is more distorted relative to the first telescoping section extension at the same screed width, thereby adversely affecting paving quality.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a telescopic screed, a paver and a telescopic control method, so that the screed is in a better working state, deformation generated when the screed stretches and contracts is reduced, and the paving quality is improved.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
in one aspect, the invention provides a telescopic screed plate, which comprises a basic section screed plate, a first telescopic section screed plate, a second telescopic section screed plate, a first telescopic driver and a second telescopic driver, wherein the first telescopic driver is used for driving the first telescopic section screed plate to transversely telescopic relative to the basic section screed plate, the second telescopic driver is used for driving the second telescopic section screed plate to transversely telescopic relative to the first telescopic section screed plate, and the telescopic screed plate further comprises a control device, wherein the control device is used for detecting telescopic states of the first telescopic section screed plate and the second telescopic section screed plate and controlling actions of the first telescopic driver and the second telescopic driver; when the control device detects that the first telescopic section screed plate is completely extended relative to the base section screed plate, the control device controls the second telescopic driver to enable the second telescopic section screed plate to extend transversely relative to the telescopic section screed plate; when the control device detects that the second telescopic section screed plate is completely retracted relative to the first telescopic section screed plate during retraction, the first telescopic drive is controlled so that the first telescopic section screed plate is transversely retracted relative to the base section screed plate.
Further, the control device comprises a first telescopic sensor, a second telescopic sensor and a telescopic controller, wherein the first telescopic sensor is used for detecting the transverse telescopic state of the first telescopic section screed relative to the base section screed, the second telescopic sensor is used for detecting the transverse telescopic state of the second telescopic section screed relative to the first telescopic section screed, and the telescopic controller receives signals of the first telescopic sensor and the second telescopic sensor and controls actions of the first telescopic driver and the second telescopic driver.
Further, the first telescoping sensor is configured to detect a lateral telescoping distance of the first telescoping section screed relative to the base section screed, and the second telescoping sensor is configured to detect a lateral telescoping distance of the second telescoping section screed relative to the first telescoping section screed.
Further, the first telescopic driver and the second telescopic driver are hydraulic oil cylinders or electric linear executing elements.
Further, when the first telescopic driver and the second telescopic driver are hydraulic cylinders, the telescopic controller drives the hydraulic cylinders to act through electromagnetic valves; when the first telescopic driver and the second telescopic driver are electric linear executing elements, the telescopic controller directly controls the electric linear executing elements to act.
Further, the first telescopic sensor and the second telescopic sensor are stroke sensors or pressure sensors for indicating telescopic states.
Another embodiment of the present invention provides a paving machine comprising a telescoping screed as set forth in any one of the preceding claims.
A further embodiment of the present invention provides a method for controlling expansion and contraction of the expansion and contraction screed according to any one of the above, the method including the steps of:
in response to the screed extension signal, the control device controls the first telescopic drive such that the first telescopic section screed is laterally extended with respect to the base section screed, and controls the second telescopic drive such that the second telescopic section screed is laterally extended with respect to the telescopic section screed only if it is detected that the first telescopic section screed is fully extended with respect to the base section screed;
in response to the screed retraction signal, the control device controls the second telescoping driver such that the second telescoping section screed is laterally retracted relative to the first telescoping section screed, and controls the first telescoping driver such that the first telescoping section screed is laterally retracted relative to the base section screed only upon detecting that the second telescoping section screed is fully retracted relative to the first telescoping section screed.
Compared with the prior art, the invention has the beneficial effects that:
by arranging the control device and ensuring that the first telescopic section screed is always stretched out preferentially when the telescopic screed is stretched out, and the second telescopic section screed is always retracted preferentially when the screed is retracted, the screed is always in an optimal working state, deformation generated when the screed is stretched out and stretched back is reduced, and accordingly paving quality is improved.
Drawings
For simplicity of illustration, the figures only show the left half of the telescoping screed, it being readily understood that telescoping screeds generally comprise generally symmetrical left and right halves.
Fig. 1 is a schematic structural view of a telescopic screed according to an embodiment of the present invention.
In the figure: 1. a base section screed; 2. a first telescoping section screed plate; 3. a second telescoping section screed plate; 4. a first telescopic drive; 5. a second telescopic drive; 6. a first telescoping sensor; 7. a second telescoping sensor; 8. a telescoping controller.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Example 1
As shown in fig. 1, the telescopic screed provided in this embodiment includes a base section screed 1, a first telescopic section screed 2, a second telescopic section screed 3, a first telescopic driver 4, and a second telescopic driver 5, where the first telescopic driver 4 is used to drive the first telescopic section screed 2 to transversely telescopic with respect to the base section screed 1, and the second telescopic driver 5 is used to drive the second telescopic section screed 3 to transversely telescopic with respect to the first telescopic section screed 2, and further includes a control device that is used to detect the telescopic states of the first telescopic section screed 2 and the second telescopic section screed 3 and control the actions of the first telescopic driver 4 and the second telescopic driver 5; when the control device detects that the first telescopic section screed 2 is completely extended relative to the base section screed 1, the control device controls the second telescopic drive 5 so that the second telescopic section screed 3 is transversely extended relative to the telescopic section screed; when the control device detects that the second telescopic section screed 3 has been fully retracted relative to the first telescopic section screed 2, it controls the first telescopic drive 4 such that the first telescopic section screed 2 is laterally retracted relative to the base section screed 1.
The telescopic screed provided in this embodiment is provided with the control device, and by setting the control device, and ensuring that the telescopic screed always preferentially extends out of the first telescopic section screed 2 when extending out, and always preferentially retracts the second telescopic section screed 3 when retracting, so that the screed is always in an optimal working state, and deformation generated when the screed extends out is reduced, thereby improving paving quality.
In this embodiment, the control device includes a first telescoping sensor 6, a second telescoping sensor 7, and a telescoping controller 8, where the first telescoping sensor 6 is used to detect a lateral telescoping state of the first telescoping section screed 2 relative to the base section screed 1, the second telescoping sensor 7 is used to detect a lateral telescoping state of the second telescoping section screed 3 relative to the first telescoping section screed 2, and the telescoping controller 8 receives signals from the first telescoping sensor 6 and the second telescoping sensor 7 and controls the actions of the first telescoping driver 4 and the second telescoping driver 5.
In this embodiment, the first telescoping sensor 6 is used to detect the lateral telescoping distance of the first telescoping section screed 2 relative to the base section screed 1, and the second telescoping sensor 7 is used to detect the lateral telescoping distance of the second telescoping section screed 3 relative to the first telescoping section screed 2.
In this embodiment, the first telescopic driver 4 and the second telescopic driver 5 are hydraulic cylinders or electric linear execution elements, and when the first telescopic driver 4 and the second telescopic driver 5 are hydraulic cylinders, the telescopic controller 8 drives the hydraulic cylinders to act through electromagnetic valves; when the first telescopic driver 4 and the second telescopic driver 5 are electric linear executing elements, the telescopic controller 8 directly controls the electric linear executing elements to act; the driving is performed by providing a plurality of driving modes, and is not limited to a certain fixed driving mode.
In this embodiment, the first telescopic sensor 6 and the second telescopic sensor 7 are stroke sensors or pressure sensors for indicating telescopic states; when the first telescopic driver 4 and the second telescopic driver 5 are hydraulic cylinders, the first telescopic sensor 6 and the second telescopic sensor 7 are preferably stroke sensors which are arranged in the hydraulic cylinders, the technology of the implementation mode is mature, the installation is simple, when the first telescopic sensor 6 and the second telescopic sensor 7 are pressure sensors, the pressure is increased along with the increase of the distance when the telescopic cylinders are telescopic to the maximum distance, and therefore whether the first telescopic section screed plate 3 is telescopic to the maximum distance can be known through measuring the pressure.
Example 2
The present embodiment provides a paver, which may employ the telescopic screed of embodiment 1.
When the paver is used for paving, the extension and contraction of the extension screed plate can be better controlled, and the screed plate can be always in the optimal working state, so that the paving quality is improved.
In this embodiment, the telescopic control 8 may be arranged inside the telescopic screed, but it is equally feasible to arrange it physically outside the screed, for example the function of the telescopic control 8 may be implemented by a master control of the main operating table of the paver.
Example 3
The embodiment provides a method for controlling the expansion of an expansion screed, where the expansion screed may adopt the structure of the expansion screed in embodiment 1, and the method may be applied to the paver in embodiment 2, and the method includes the following steps:
in response to the screed extension signal, the control means controls the first telescopic drive 4 such that the first telescopic section screed 2 is laterally extended with respect to the base section screed 1, and controls the second telescopic drive 5 such that the second telescopic section screed 3 is laterally extended with respect to the telescopic section screed only when it is detected that the first telescopic section screed 2 has been fully extended with respect to the base section screed 1;
in response to the screed retraction signal, the control means controls the second telescopic drive 5 such that the second telescopic section screed 3 is retracted laterally with respect to the first telescopic section screed 2, and controls the first telescopic drive 4 such that the first telescopic section screed 2 is retracted laterally with respect to the base section screed 1 only when it is detected that the second telescopic section screed 3 has been fully retracted with respect to the first telescopic section screed 2.
According to the telescopic control method for the telescopic screed, provided by the embodiment, the first telescopic section screed 2 and the second telescopic section screed 3 are detected and controlled, so that the telescopic screed always preferentially stretches out of the first telescopic section screed 2 when stretching out, and the second telescopic section screed 3 always preferentially stretches out of the second telescopic section screed when retracting, so that the screed is always in an optimal working state, deformation generated when the screed stretches out and draws back is reduced, and paving quality is improved.
The matters devised in the above embodiments are explained below in connection with a preferred embodiment.
The main operating platform of the paver or the side control boxes on two sides of the screed are usually provided with buttons for controlling the screed to stretch and retract, and when the screed needs to stretch and retract, operators can operate the buttons until the screed reaches the required width. When the telescopic controller 8 receives the extension signal, the telescopic controller 8 first controls the first telescopic drive 4 such that the first telescopic section screed 2 extends laterally with respect to the base section screed 1; if the extension signal is still on when the first telescopic section screed 2 is fully extended, then the first telescopic sensor 6 sends a signal to the telescopic controller 8, which telescopic controller 8 controls the second telescopic drive 5 such that the second telescopic section screed 3 extends laterally with respect to the first telescopic section screed 2.
When the telescopic controller 8 receives the retraction signal, the telescopic controller 8 first controls the second telescopic drive 5 such that the second telescopic section screed 3 is retracted laterally with respect to the first telescopic section screed 2; if the retraction signal is still on when the second telescopic section screed 3 is fully retracted, then the second telescopic sensor 7 sends a signal to the telescopic controller 8, which telescopic controller 8 controls the first telescopic drive 4 such that the first telescopic section screed 2 is retracted laterally with respect to the base section screed 1.
The first telescopic section screed 2/second telescopic section screed 3 is typically connected to the base section screed 1/first telescopic section screed 2 by a first/second telescopic guide mechanism (not shown) to achieve lateral scalability. According to research, the deformation of the telescopic ironing plate is generated by a telescopic guide mechanism to a great extent, and when the second telescopic ironing plate stretches out, the first telescopic guide mechanism and the second telescopic guide mechanism bear load and deform no matter whether the first telescopic section ironing plate 2 stretches out or not; when the second telescopic section screed 3 is not extended, only the first telescopic section screed 2 is extended, and only the first telescopic guiding mechanism is loaded and deformed. That is, the second telescopic screed 3 is more deformed than the first telescopic screed with the same screed width, which is disadvantageous for ensuring the paving quality.
By providing the first telescopic sensor 6, the second telescopic sensor 7 and the telescopic controller 8 and ensuring that the telescopic screed always extends out of the first telescopic section screed 2 when extending out, and the second telescopic section screed 3 when retracting, the screed is always retracted, the screed can always be in an optimal working state, the screed deformation is reduced and the paving quality is improved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. The utility model provides a flexible screed, includes basic section screed (1), first flexible section screed (2), second flexible section screed (3), first flexible driver (4), second flexible driver (5), and first flexible driver (4) are used for driving first flexible section screed (2) transversely flexible relative to basic section screed (1), and second flexible driver (5) are used for driving second flexible section screed (3) transversely flexible relative to first flexible section screed (2), characterized by,
the control device is used for detecting the telescopic states of the first telescopic section screed (2) and the second telescopic section screed (3) and controlling the actions of the first telescopic driver (4) and the second telescopic driver (5);
when the control device detects that the first telescopic section screed (2) is completely extended relative to the base section screed (1), the control device controls the second telescopic driver (5) to enable the second telescopic section screed (3) to extend transversely relative to the telescopic section screed;
when the control device detects that the second telescopic section screed (3) is completely retracted relative to the first telescopic section screed (2), the control device controls the first telescopic drive (4) so that the first telescopic section screed (2) is transversely retracted relative to the base section screed (1).
2. The telescopic screed according to claim 1, wherein the control device comprises a first telescopic sensor (6), a second telescopic sensor (7) and a telescopic controller (8), the first telescopic sensor (6) being adapted to detect a lateral telescopic condition of the first telescopic section screed (2) relative to the base section screed (1), the second telescopic sensor (7) being adapted to detect a lateral telescopic condition of the second telescopic section screed (3) relative to the first telescopic section screed (2), the telescopic controller (8) receiving signals of the first telescopic sensor (6), the second telescopic sensor (7) and controlling the actions of the first telescopic drive (4), the second telescopic drive (5).
3. Telescopic screed according to claim 2, wherein the first telescopic sensor (6) is adapted to detect a lateral telescopic distance of the first telescopic section screed (2) relative to the base section screed (1), and the second telescopic sensor (7) is adapted to detect a lateral telescopic distance of the second telescopic section screed (3) relative to the first telescopic section screed (2).
4. Telescopic screed according to claim 2, wherein the first telescopic drive (4) and the second telescopic drive (5) are hydraulic cylinders or electric linear actuators.
5. The telescopic screed according to claim 2, wherein when the first telescopic drive (4) and the second telescopic drive (5) are hydraulic cylinders, the telescopic controller (8) drives the hydraulic cylinders to act through solenoid valves; when the first telescopic driver (4) and the second telescopic driver (5) are electric linear executing elements, the telescopic controller (8) directly controls the electric linear executing elements to act.
6. Telescopic screed according to claim 2, wherein the first telescopic sensor (6) and the second telescopic sensor (7) are stroke sensors or pressure sensors indicating a telescopic state.
7. A paver comprising a telescopic screed according to any one of claims 1 to 6.
8. The method for controlling the expansion of the expansion screed plate is characterized by comprising the following steps:
in response to the screed extension signal, the control device controls the first telescopic drive (4) such that the first telescopic section screed (2) extends laterally with respect to the base section screed (1), and controls the second telescopic drive (5) such that the second telescopic section screed (3) extends laterally with respect to the telescopic section screed only when it is detected that the first telescopic section screed (2) has been fully extended with respect to the base section screed (1);
in response to the screed retraction signal, the control means controls the second telescopic drive (5) such that the second telescopic section screed (3) is retracted laterally with respect to the first telescopic section screed (2), and controls the first telescopic drive (4) such that the first telescopic section screed (2) is retracted laterally with respect to the base section screed (1) only when it is detected that the second telescopic section screed (3) has been retracted fully with respect to the first telescopic section screed (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110481016.9A CN113174817B (en) | 2021-04-30 | 2021-04-30 | Telescopic screed, paver and telescopic control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110481016.9A CN113174817B (en) | 2021-04-30 | 2021-04-30 | Telescopic screed, paver and telescopic control method |
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| CN113174817A CN113174817A (en) | 2021-07-27 |
| CN113174817B true CN113174817B (en) | 2023-07-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102602810B (en) * | 2012-03-26 | 2013-07-24 | 中联重科股份有限公司 | Control device and method of telescopic boom, system and construction machinery |
| CN208803341U (en) * | 2018-06-28 | 2019-04-30 | 青岛亿伟壹建设设备工程有限公司 | The one flexible paver screed assembly of 8 meters of key |
| CN108951378A (en) * | 2018-08-14 | 2018-12-07 | 三汽车制造有限公司 | A kind of ironing machine and paver |
| CN112482149B (en) * | 2020-11-19 | 2022-07-12 | 徐工集团工程机械股份有限公司道路机械分公司 | Telescopic screed plate and paver |
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