CN111366173A - Method for detecting damage of screen of vibrating screen - Google Patents
Method for detecting damage of screen of vibrating screen Download PDFInfo
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- CN111366173A CN111366173A CN202010186224.1A CN202010186224A CN111366173A CN 111366173 A CN111366173 A CN 111366173A CN 202010186224 A CN202010186224 A CN 202010186224A CN 111366173 A CN111366173 A CN 111366173A
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- 238000001514 detection method Methods 0.000 claims abstract description 103
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/02—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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Abstract
The invention discloses a method for detecting damage of a screen of a vibrating screen, which comprises the following steps: in the normal working process of the vibrating screen, the connecting rod is conveyed to the position above the screen, and rock debris is cleaned through bristles on the connecting rod; the detection rod in the connecting rod naturally falls from the bottom of the connecting rod: when the screen opposite to the detection rod is intact, the detection rod pushes against the upper surface of the screen, and the sensing device in the connecting rod cannot sense the detection rod; when the just right screen cloth of detection stick has the damage, during the bottom of detecting the stick fell into the damaged hole, the locating part stopped to detect the stick and drops from the connecting rod in, and induction system in the connecting rod senses the detection stick this moment, sends the sensing signal, sends the warning through sensing signal control warning device. The method is used for solving the problem that whether the screen of the vibrating screen is damaged or not is difficult to judge under the premise of not influencing the performance of the drilling fluid in the prior art, and achieves the purposes of not increasing the workload of a mud worker, not polluting the performance of the drilling fluid and judging whether the screen of the vibrating screen is damaged or not under the state of starting the pump.
Description
Technical Field
The invention relates to the field of solid control systems, in particular to a method for detecting damage of a screen of a vibrating screen.
Background
In the field of petroleum drilling, a solid control system is one of eight systems in a well site, and is used for separating and treating particles such as rock debris, sand and the like in drilling fluid and completion fluid, maintaining the performance of the drilling fluid and storing and circulating the drilling fluid. The most central devices in the solid control system are a vibrating screen and a centrifugal machine, wherein the centrifugal machine is mainly used for reducing the mud content in the drilling fluid for a mud rock section with excellent dispersion, so that the vibrating screen is the most important weight in the solid control system, and a large amount of rock debris is separated out through the vibrating screen, so that the circulating use of the drilling fluid can be ensured. On the drilling construction site, as long as the well is in a pump-on state, the vibrating screen is necessarily required to be opened, so that the operating pressure of the vibrating screen is extremely high, and the phenomenon of screen damage can often occur. For the vibrating screen used in the drilling engineering, the screen cloth on the vibrating screen is detachable, so that the vibrating screen can be replaced independently after the screen cloth is found to be damaged. However, during drilling, the vibrating screen is generally covered with a large amount of rock debris, the rock debris almost completely covers the surface of the screen under the coating of the drilling fluid, the temperature of the drilling fluid returning from the underground is high, and a large amount of water mist is formed on the vibrating screen in winter, and the phenomenon makes it difficult for a mud worker (a worker specially responsible for maintaining the normal operation of the vibrating screen) to directly observe whether the screen is damaged or not through naked eyes. In the prior art, a slurry worker judges whether a screen is damaged or not through the following two ways: (1) when the pump is started, the surface of the screen is directly washed by a water pipe, and clean areas are washed one by one for observation; (2) and when the well mouth stops pumping operations such as column connection, column disconnection and the like, the surface of the screen is observed rapidly. The method (1) inevitably leads a large amount of clear water to enter a mud pit through a screen, and seriously leads the performance of the drilling fluid to be interfered, such as viscosity reduction, density reduction and stabilizer content reduction, which can seriously destroy the suspension and carrying capacity of the drilling fluid on rock debris, influence the stability of a well wall, and even easily induce underground engineering accidents in serious cases; the method (2) is severely restricted by the working conditions of the operation on the well, so that the phenomenon that a large amount of rock debris enters a mud pit through the damaged screen to pollute the drilling fluid is frequently caused after the screen is found to be damaged and lagged. Therefore, the two treatment modes are one of the reasons that the drilling fluid needs to continuously replace the slurry and supplement new glue solution in the prior art, and the cost of the drilling fluid is always high indirectly.
Disclosure of Invention
The invention aims to provide a method for detecting damage of a screen of a vibrating screen, which aims to solve the problem that in the prior art, whether the screen of the vibrating screen is damaged or not is difficult to judge under the premise of not influencing the performance of drilling fluid, and achieve the purposes of not increasing the workload of a mud worker, not polluting the performance of the drilling fluid and judging whether the screen of the vibrating screen is damaged or not under the state of starting the pump.
The invention is realized by the following technical scheme:
a method for detecting screen breakage of a vibrating screen comprises the following steps:
s1, in the normal working process of the vibrating screen, the connecting rod is sent to the position above the screen, and rock debris on the screen is cleaned through bristles fixed on the connecting rod;
s2, enabling the connecting rod to reciprocate on the screen, and enabling the detection rod in the connecting rod to naturally fall from the bottom of the connecting rod:
when the screen opposite to the detection rod is intact, the detection rod pushes against the upper surface of the screen, and the sensing device in the connecting rod cannot sense the detection rod;
when the screen opposite to the detection rod is damaged, the bottom end of the detection rod falls into the damaged hole, the limiting part prevents the detection rod from falling off from the connecting rod, and the sensing device in the connecting rod senses the detection rod;
and S3, when the sensing device senses the detection rod, a sensing signal is sent out, and the warning device is controlled to send out a warning through the sensing signal.
The invention provides a method for detecting screen damage of a vibrating screen, which aims to solve the problem that whether the screen of the vibrating screen is damaged or not in a pump opening state is difficult to judge on the premise of not influencing the performance of drilling fluid in the prior art. The vibrating screen brush is a field tool which is equipped by a mud worker of any drilling team, is a main tool for preventing the mud worker from running out of the vibrating screen, is generally self-made by the field worker, and is connected with a brush handle and brush bristles by a connecting rod, wherein the length of the brush handle is generally 1-2 m so as to meet the requirement of extending into the bottommost part of the horizontal vibrating screen. Once the shale shaker department takes place to run thick liquid, not only extravagant drilling fluid, more importantly can seriously disturb the judge of logging party to the drilling fluid total amount, leads to the wrong well leakage accident of affirmation. Therefore, at the initial stage of excessive rock debris on the vibrating screen or slurry soaking, the shale shavings on the screen are directly and quickly brushed down by the vibrating screen brush for the mud worker, so that the slurry running condition at the vibrating screen when the rock debris is accumulated excessively or the content of mud in drilling fluid is too high is avoided. However, as the drilling fluid continuously returns to the vibrating screen, the accumulated rock debris cannot be cleaned quickly by the simple operation, and the screen cannot be brushed clean to judge whether the screen is damaged or not. On above-mentioned basis, this application has fully combined the foundation structure of current shale shaker brush, makes a plurality of detection stick insert to the connecting rod in from the connecting rod bottom activity, detects the trend that the stick has in the connecting rod that drops out downwards under self action of gravity promptly. The working principle of this application does: when the screen cloth does not have the damage, detect the stick and descend at most to propping up the screen cloth surface, detect the stick this moment and do not reach the stroke bottom, consequently can not be sensed by induction system. When the screen cloth had the damage, if certain detection stick just in time arrived damaged position, owing to do not have the bearing of screen cloth this moment, the detection stick directly falls under the action of gravity, until reaching the stroke bottom, is sensed by induction system this moment, and induction system signals to make warning device send the warning. In the method, the reciprocating motion of the connecting rod on the screen mesh can be driven by manpower, or can be driven by mechanical machinery, such as a cylinder, a hydraulic cylinder, an electric push rod and the like which can carry out reciprocating motion. According to the method, in the normal process of cleaning the screen and avoiding slurry leakage, each detection rod is used, when the screen is damaged, as long as one detection rod reaches the damaged position, the warning device can give a warning, so that a mudman knows that the screen is damaged, the mud man can replace the screen in time, the pollution of the performance of drilling fluid caused by the damage of the screen is obviously reduced, the workload of the mudman is not increased, the performance of the drilling fluid is not polluted, and the purpose of judging whether the screen of the vibrating screen is damaged or not in a pump-on state is achieved. Of course, in the present application, the higher the arrangement density of the detection rods on the connecting rod, the higher the detection accuracy, and those skilled in the art can adaptively set the arrangement density of the detection mechanism according to actual conditions.
When the bottom end of the detection rod falls into the damaged hole, the sensing device indirectly senses that the detection rod reaches the bottom end of the stroke. In this scheme, induction system does not direct induction detection stick itself, but judges through indirect mode whether the detection stick descends, whether reach the stroke bottom. The specific indirect sensing method is not limited herein, and a person skilled in the art can perform adaptive setting as required, and only the sensing device needs to sense that the detection rod can be sensed by the sensing device when falling through the damaged hole on the screen.
Preferably, the indirect sensing method is as follows: a sleeve is fixedly connected to one end, located inside the connecting rod, of the detection rod, so that the sleeve can slide up and down inside the connecting rod along with the detection rod, and the sleeve is located above the limiting piece all the time; when the detection rod falls down, the bottom end of the sleeve is driven to abut against the top surface of the limiting part, and at the moment, the bottom end of the sleeve is in contact with the sensing device positioned on the top surface of the limiting part.
Preferably, the sleeve slides axially along the fixed column inside the connecting rod.
Preferably, through the sliding sleeve cooperation between sleeve top and the fixed column, through the sliding sleeve cooperation between connecting rod bottom and the detection stick.
The manufacturing method of the sliding sleeve comprises the following steps:
sa, forming a plurality of hemispherical grooves in the inner wall of the tubular outer cylinder;
sb, forming a plurality of through holes in the side wall of the tubular inner cylinder, wherein the outer diameter of the inner cylinder is equal to the inner diameter of the outer cylinder, and the inner cylinder and the outer cylinder are equal in length in the axial direction; the through holes are opposite to the hemispherical grooves one by one, the mutually opposite hemispherical grooves and the through holes form a spherical cavity together, and the section of the spherical cavity on a plane passing through the axis of the outer barrel is in a major arc shape;
sc, filling a ball in each semi-spherical groove, wherein the outer diameter of the ball is smaller than the inner diameter of the spherical cavity;
sd, adhering the inner cylinder to the inner wall of the outer cylinder by using an adhesive to ensure that each ball partially protrudes out of the through hole; waiting for the adhesive to set.
This scheme during operation realizes the roll connection between connecting rod and the detection stick and between sleeve and the fixed column through the ball. To the not good stratum detritus of dispersion effect, have a large amount of cemented detritus together in its returning, when the measuring stick meets with this type detritus on the screen cloth, if the measuring stick forces to go through and leads to this application inner structure atress uneven and unstability easily, can influence life in the past for a long time. For this reason, all set up the sliding sleeve between two connection positions, between sleeve top and the fixed column, between connecting rod bottom and the detection stick. The urceolus and the inner tube of sliding sleeve are fixed each other, and form a plurality of spherical cavitys, wherein place the ball for detect the stick and the sleeve homoenergetic and freely rotate. When encountering large rock debris, the detection rod can pass through in a rotating mode, so that the instantaneous stress of the detection rod can be effectively reduced, under the action force of a mud worker pushing and pulling the brush holder, the detection rod can break the large rock debris in a rotating passing mode, and after the large rock debris is broken into small rock debris, the local pressure on the screen can be effectively reduced. Consequently, this scheme is through detecting the stick and rotating the mode through bold detritus, effectively carries out the damage to the bold detritus on the screen cloth, has effectively reduced the screen cloth breakage rate for when detecting the damaged condition of screen cloth, can also play the guard action to the screen cloth, reduce the damaged probability of screen cloth in return, realized unexpected technological effect. The manufacturing method of the sleeve can ensure that the ball can be stably positioned and cannot fall off.
Preferably, the outer cylinder is made of metal, and the inner cylinder is made of flexible material. The situation that the inner barrel is inconvenient to be in place after the balls are placed is avoided. The sleeve made of the flexible material can deform and compress when in place, so that the sleeve is extruded into the outer barrel, and the manufacturing convenience of the sliding sleeve is improved.
The flexible material is silica gel.
In step S2, the connecting rod is manually pushed and pulled by the brush handle to reciprocate on the screen. The method has the advantages that extra workload can not be caused to a mud worker, and the mud worker can detect the damage of the screen incidentally in the process of cleaning rock debris on the vibrating screen.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the method for detecting the damage of the screen of the vibrating screen, disclosed by the invention, when the screen is not damaged, the detection rod descends to the surface of the screen at most, and does not reach the bottom end of the stroke, so that the detection rod cannot be sensed by the sensing device. When the screen cloth had the damage, if certain detection stick just in time arrived damaged position, owing to do not have the bearing of screen cloth this moment, the detection stick directly falls under the action of gravity, until reaching the stroke bottom, is sensed by induction system this moment, and induction system signals to make warning device send the warning.
2. According to the method for detecting the damage of the screen cloth of the vibrating screen, disclosed by the invention, in the normal process of cleaning the screen cloth and avoiding slurry leakage, all the detection rods are used, when the screen cloth is damaged, only one detection rod reaches the damaged position, a warning device can be used for giving a warning, so that a mud worker knows that the screen cloth is damaged, the timely replacement is convenient, the pollution of the performance of drilling fluid caused by the damage of the screen cloth is obviously reduced, the workload of the mud worker is not increased, the performance of the drilling fluid is not polluted, and the purpose of judging whether the screen cloth of the vibrating screen is damaged or not in a pump starting state is realized.
3. According to the method for detecting the damage of the screen of the vibrating screen, the large rock fragments on the screen are effectively damaged in a mode that the detection rod rotates to pass through the large rock fragments, the damage rate of the screen is effectively reduced, the screen can be protected while the damage condition of the screen is detected, and the damage probability of the screen is reduced in turn.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a drop-down test stick in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a cross-sectional view of a detection rod in an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a sliding sleeve according to an embodiment of the present invention;
fig. 6 is a partially enlarged view of fig. 5 at B.
Reference numbers and corresponding part names in the drawings:
1-brush handle, 101-first conical section, 2-connecting rod, 3-brush hair, 4-detection rod, 401-third conical section, 5-limiting piece, 6-sensing device, 7-warning device, 8-fixed column, 801-threaded section, 802-optical rod section, 803-nut, 9-sleeve, 901-second conical section, 10-cavity, 11-sliding sleeve, 111-outer cylinder, 112-inner cylinder, 113-hemispherical groove, 114-through hole, 115-ball and 12-mounting bar.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
a method for detecting screen breakage of a vibrating screen comprises the following steps:
s1, in the normal working process of the vibrating screen, the connecting rod is sent to the position above the screen, and rock debris on the screen is cleaned through bristles fixed on the connecting rod;
s2, enabling the connecting rod to reciprocate on the screen, and enabling the detection rod in the connecting rod to naturally fall from the bottom of the connecting rod:
when the screen opposite to the detection rod is intact, the detection rod pushes against the upper surface of the screen, and the sensing device in the connecting rod cannot sense the detection rod;
when the screen opposite to the detection rod is damaged, the bottom end of the detection rod falls into the damaged hole, the limiting part prevents the detection rod from falling off from the connecting rod, and the sensing device in the connecting rod senses the detection rod;
and S3, when the sensing device senses the detection rod, a sensing signal is sent out, and the warning device is controlled to send out a warning through the sensing signal.
The embodiment is realized based on the equipment shown in fig. 1 to 5, and includes a brush holder 1, a connecting rod 2 fixed at one end of the brush holder 1, and bristles 3 arranged on the connecting rod 2, wherein the connecting rod 2 is provided with a plurality of detection mechanisms, each detection mechanism includes a detection rod 4 movably inserted into the bottom of the connecting rod 2, a limiting member 5 located inside the connecting rod 2, and a sensing device 6 located on the limiting member 5, the limiting member 5 is used for preventing the detection rod 4 from falling off from the bottom of the connecting rod 2, and the sensing device 6 is used for sensing whether the detection rod 4 reaches the bottom of the stroke; and the warning device 7 is in signal connection with the sensing device 6.
The connecting rod 2 is in a strip shape, and a plurality of detection mechanisms are uniformly distributed along the long axis of the connecting rod 2. The detection rod 4 is made of precast concrete; the sensing device 6 is a contact switch, and the warning device 7 is an indicator lamp arranged on the brush handle 1. The brush hair 3 is fixed on the connecting rod 2 through a mounting strip 12, and the mounting strip 12 is fixed on the two side surfaces of the connecting rod 2 facing and departing from the brush holder 1.
In this embodiment, the external diameter of detection stick 5 ~ 8mm ensures that the screen cloth damage hole about 1cm can both detect.
The embodiment has fully combined the foundation structure of current shale shaker brush, sets up a plurality of detection mechanism on connecting rod 2, and every detection mechanism all includes detection stick 4, detects stick 4 from 2 bottom activities of connecting rod and inserts to connecting rod 2 in, detects the trend that stick 4 had downwards the falling out in connecting rod 2 under self action of gravity promptly. In order to avoid the detection rod 4 from falling off, the limiting part 5 is arranged in the connecting rod 2, and the detection rod 4 is prevented from falling off from the bottom of the connecting rod 2 through the limiting part 5. Still be provided with the induction system who is used for the response to detect 4 positions of stick on locating part 5, when detecting 4 downstream to stroke bottom, detect stick 4 promptly and blockked when unable continuation downstream by locating part 5, induction system can sense and detect stick 4 this moment to obtain and detect stick 4 and moved to the stroke bottom, detect stick 4 this moment and to alarm device signals, alarm device can send out the warning after receiving the signal. Specifically, the working principle of this application does: when the screen cloth does not have the damage, detection stick 4 descends to pushing up the screen cloth surface at most, and detection stick 4 does not reach the stroke bottom this moment, consequently can not be sensed by induction system. When the screen cloth has the damage, if certain detection stick 4 just in time reachs the damaged position, owing to do not have the bearing of screen cloth this moment, detection stick 4 directly falls under the action of gravity, until reaching the stroke bottom, is sensed by induction system this moment, and induction system signals to make warning device send the warning. When this application uses, the mud worker can regard this application as conventional shale shaker brush to use completely, at normal pump drilling in-process that opens, carries out conventional screen cloth clearance operation with this application. At normal clearance screen cloth, avoid running the in-process of thick liquid, each detection stick 4 just is used in the performance, when the screen cloth is damaged, as long as there is a detection stick 4 to reach this damaged position, can send the warning through warning device, make the mud worker know that there is the screen cloth to take place the damage, thereby be convenient for in time change, showing the drilling fluid performance pollution that has reduced the damaged bringing of screen cloth, realized not increasing mud worker work load, can not pollute the drilling fluid performance, and can judge the mesh whether damaged of shale shaker screen cloth under the state of opening the pump.
Preferably, the present embodiment has a power supply built into the touch screen 1, and the power supply is used for supplying power to each sensing device 6 to ensure that the sensing device works normally. A control switch is also arranged on the brush handle 1 and is used for controlling whether the power supply supplies power to each induction device 6, so that a worker can close the control switch at ordinary times and all the induction devices do not work; when the brush handle is taken up, the connecting rod is placed on the screen, and the control switch is turned on after the brush bristles 3 are contacted with the screen.
Example 2:
on the basis of the embodiment 1, the detection mechanism further comprises a fixed column 8 fixed inside the connecting rod 2, the limiting piece 5 is an annular flange located at the bottom end of the fixed column 8, and the sensing device 6 is located on the top surface of the limiting piece 5; one end of the detection rod 4, which is positioned inside the connecting rod 2, is fixedly connected with a sleeve 9, the top end of the sleeve 9 is positioned above the limiting part 5, and the top end of the sleeve 9 is movably sleeved on the fixed column 8; when the top end of the sleeve 9 contacts the limiting part 5, the sensing device 6 sends out a sensing signal.
The fixing column 8 comprises a threaded section 801 and a polished rod section 802 which are distributed up and down, the top of the connecting rod 2 is provided with a threaded through hole matched with the threaded section 801, and the threaded section 801 is connected with the threaded through hole and fixed through a nut 803; the top end of the sleeve 9 is movably sleeved on the polished rod section 802. The connecting rod 2 is internally provided with a cavity 10 for accommodating the limiting part 5, the sensing device 6 and the sleeve 9, the bottom of the cavity 10 is provided with a first tapered section 101 with a large top and a small bottom, the bottom of the sleeve 9 is provided with a second tapered section 901 matched with the first tapered section 101, and the top of the detection rod 4 is provided with a third tapered section 401 matched with the inner wall of the second tapered section 901. The outer wall of the third conical section 401 and the inner wall of the second conical section 901 are bonded through cement mortar or waterproof glue. First toper section 101 cooperatees with second toper section 901 for when the sleeve tenesmus, second toper section 901 is automatic to be blocked in first toper section 101 in the cavity, blocks the sleeve through big-end-up's toper structure, improves the stress stability of sleeve when detecting the stick and reach the stroke bottom. The top of the detection rod is set to be the third conical section 401 matched with the inner wall of the second conical section 901, so that the contact area between the detection rod and the sleeve is increased, the connection stability of the detection rod and the sleeve is improved, the service life of the device is prolonged, and meanwhile, drilling fluid can be effectively prevented from extending upwards into the cavity. The outer wall of the third conical section 401 and the inner wall of the second conical section 901 are bonded through cement mortar or waterproof glue. Preferably, when the detection rod is precast concrete, the detection rod is bonded with the sleeve through cement mortar; when the detection rod is made of other materials, wood and silica gel, the detection rod is bonded by waterproof glue. Bonding is carried out on the whole contact surface of the second conical section 901 and the third conical section 401, so that not only is excellent connection performance satisfied, but also a good water blocking effect can be ensured.
The fixing column 8 in this embodiment is located inside the connecting rod 2, and is firstly used for providing a specific structure for mounting and bearing the limiting member 5, and secondly for providing a stable restriction for the up-and-down sliding of the sleeve 9 inside the connecting rod, so as to ensure the sliding direction of the sleeve. Because induction system 6 is located 5 top surfaces of locating part, and sleeve 9 top is located the locating part top, therefore when detecting stick 4 and driving the sleeve and descend, telescopic top is close to the induction system at locating part top gradually. When the screen cloth has the damage, detect the stick and drop under the action of gravity, drive sleeve top and remove locating part top, contact with induction system. This scheme is when detecting the stick and not falling, and sleeve and locating part and induction system all contactless, so the erroneous judgement rate is extremely low, has fully ensured the detection precision of this application to damaged screen cloth. In addition, the fixed column is in threaded connection with the connecting rod through the upper threaded section. The polished rod section below the fixed column is a telescopic sliding area, so that the sleeve slides up and down along the polished rod section, the friction resistance in the sleeve movement process is reduced, and the sleeve can be ensured to quickly fall under the driving of the gravity of the detection rod.
When this embodiment uses, the mud worker can regard this application as conventional shale shaker brush to use completely, at normal pump drilling in-process of opening, carries out conventional screen cloth clearance operation with this application. At normal clearance screen cloth, avoid running the in-process of thick liquid, each detection stick just is used in the performance, when the screen cloth is damaged, as long as there is a detection stick to reach this damaged position, can send the warning through warning device, make the mud worker know that there is the screen cloth to take place the damage, thereby be convenient for in time change, showing the drilling fluid performance that has reduced the damaged bringing of screen cloth and polluting, realized not increasing mud worker work load, can not pollute the drilling fluid performance, and can judge the mesh whether damaged of shale shaker screen cloth under the state of opening the pump.
Example 3:
as shown in fig. 1 to 6, in the method for detecting damage to a screen of a vibrating screen according to embodiment 2, sliding sleeves 11 are respectively disposed between the top end of the sleeve 9 and the fixing column 8, and between the bottom of the connecting rod 2 and the detection rod 4. The sliding sleeve 11 comprises an outer cylinder 111 and an inner cylinder 112 which are bonded with each other, the inner wall of the outer cylinder 111 is provided with a plurality of hemispherical grooves 113, and the inner cylinder 112 is provided with through holes 114 which are opposite to the hemispherical grooves 113 one by one; the mutually opposite hemispherical grooves 113 and the through holes 114 jointly form a spherical cavity, the section of the spherical cavity on the plane passing through the axis of the sleeve 9 is in a major arc shape, the ball 115 is movably placed in the spherical cavity, the outer diameter of the ball 115 is smaller than the inner diameter of the spherical cavity, and the ball 115 cannot fall off from the spherical cavity.
In the present embodiment, the outer cylinder 111 and the inner cylinder 112 are provided in the sliding sleeve for facilitating the installation of the balls, and the outer cylinder 111 and the inner cylinder 112 may be fixedly connected by any conventional method, and preferably bonded by using a metal adhesive. Wherein, for the sliding sleeve 11 between the sleeve 9 and the fixed column 8, the outer cylinder thereof is fixed at the top end of the sleeve 9, and the ball thereof is contacted with the fixed column; for the sliding sleeve 11 between the bottom of the connecting rod 2 and the detecting rod 4, the outer cylinder is fixed at the bottom of the connecting rod 2, and the ball thereof is contacted with the detecting rod 4.
When meeting with bold detritus, detection stick 4 is broken with the bold detritus with the mode that rotates to pass through in this embodiment, and after the bold detritus was broken into the fritter detritus, can effectively reduce the local pressure to the screen cloth to effectively carry out the damage to the bold detritus on the screen cloth, effectively reduced the screen cloth breakage rate, make when detecting the screen cloth damaged condition, can also play the guard action to the screen cloth, reduce screen cloth breakage probability in reverse.
The manufacturing method of the sliding sleeve comprises the following steps:
sa, forming a plurality of hemispherical grooves in the inner wall of the tubular outer cylinder;
sb, forming a plurality of through holes in the side wall of the tubular inner cylinder, wherein the outer diameter of the inner cylinder is equal to the inner diameter of the outer cylinder, and the inner cylinder and the outer cylinder are equal in length in the axial direction; the through holes are opposite to the hemispherical grooves one by one, the mutually opposite hemispherical grooves and the through holes form a spherical cavity together, and the section of the spherical cavity on a plane passing through the axis of the outer barrel is in a major arc shape;
sc, filling a ball in each semi-spherical groove, wherein the outer diameter of the ball is smaller than the inner diameter of the spherical cavity;
sd, adhering the inner cylinder to the inner wall of the outer cylinder by using an adhesive to ensure that each ball partially protrudes out of the through hole; waiting for the adhesive to set.
Preferably, the outer cylinder is made of metal, and the inner cylinder is made of flexible material. The flexible material is silica gel.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for detecting breakage of a screen of a vibrating screen is characterized by comprising the following steps:
s1, in the normal working process of the vibrating screen, the connecting rod is sent to the position above the screen, and rock debris on the screen is cleaned through bristles fixed on the connecting rod;
s2, enabling the connecting rod to reciprocate on the screen, and enabling the detection rod in the connecting rod to naturally fall from the bottom of the connecting rod:
when the screen opposite to the detection rod is intact, the detection rod pushes against the upper surface of the screen, and the sensing device in the connecting rod cannot sense the detection rod;
when the screen opposite to the detection rod is damaged, the bottom end of the detection rod falls into the damaged hole, the limiting part prevents the detection rod from falling off from the connecting rod, and the sensing device in the connecting rod senses the detection rod;
and S3, when the sensing device senses the detection rod, a sensing signal is sent out, and the warning device is controlled to send out a warning through the sensing signal.
2. The method as claimed in claim 1, wherein when the bottom end of the detecting rod falls into the damaged hole, the sensing device indirectly senses that the detecting rod reaches the bottom end of the stroke.
3. The method for detecting screen mesh breakage of a vibrating screen as claimed in claim 2, wherein the indirect sensing method comprises: a sleeve is fixedly connected to one end, located inside the connecting rod, of the detection rod, so that the sleeve can slide up and down inside the connecting rod along with the detection rod, and the sleeve is located above the limiting piece all the time; when the detection rod falls down, the bottom end of the sleeve is driven to abut against the top surface of the limiting part, and at the moment, the bottom end of the sleeve is in contact with the sensing device positioned on the top surface of the limiting part.
4. The method as claimed in claim 3, wherein the sleeve slides axially along the fixed post inside the connecting rod.
5. The method for detecting the damage of the screen of the vibrating screen as claimed in claim 4, wherein the top end of the sleeve is matched with the fixed column through a sliding sleeve, and the bottom of the connecting rod is matched with the detection rod through a sliding sleeve.
6. The method for detecting the damage of the screen mesh of the vibrating screen as claimed in claim 5, wherein the method for manufacturing the sliding sleeve comprises the following steps:
sa, forming a plurality of hemispherical grooves in the inner wall of the tubular outer cylinder;
sb, forming a plurality of through holes in the side wall of the tubular inner cylinder, wherein the outer diameter of the inner cylinder is equal to the inner diameter of the outer cylinder, and the inner cylinder and the outer cylinder are equal in length in the axial direction; the through holes are opposite to the hemispherical grooves one by one, the mutually opposite hemispherical grooves and the through holes form a spherical cavity together, and the section of the spherical cavity on a plane passing through the axis of the outer barrel is in a major arc shape;
sc, filling a ball in each semi-spherical groove, wherein the outer diameter of the ball is smaller than the inner diameter of the spherical cavity;
sd, adhering the inner cylinder to the inner wall of the outer cylinder by using an adhesive to ensure that each ball partially protrudes out of the through hole; waiting for the adhesive to set.
7. The method of claim 6, wherein the outer cylinder is made of metal and the inner cylinder is made of flexible material.
8. The method as claimed in claim 7, wherein the flexible material is silica gel.
9. The method as claimed in claim 1, wherein the step S2 is performed by manually pushing and pulling the connecting rod to and fro on the screen by the brush holder.
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Effective date of registration: 20201125 Address after: No.103 Jianbao North Road, private industrial park, Jianhu County, Yancheng City, Jiangsu Province Applicant after: JIANHU COUNTY YONGWEI VALVE AND DRILL Co.,Ltd. Address before: 611630 No.3, building 21, Baita community, group 9, Baita village, Heshan Town, Pujiang County, Chengdu City, Sichuan Province Applicant before: Xiong Chaozhu |
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