CN111811799B - Grease metering device for shield tail brush and grease metering method thereof - Google Patents
Grease metering device for shield tail brush and grease metering method thereof Download PDFInfo
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- CN111811799B CN111811799B CN202010613705.6A CN202010613705A CN111811799B CN 111811799 B CN111811799 B CN 111811799B CN 202010613705 A CN202010613705 A CN 202010613705A CN 111811799 B CN111811799 B CN 111811799B
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- 239000004519 grease Substances 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- 238000007789 sealing Methods 0.000 claims abstract description 103
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 230000005641 tunneling Effects 0.000 claims description 21
- 238000013519 translation Methods 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 5
- 238000012856 packing Methods 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a grease metering device for a shield tail brush and a grease metering method thereof, wherein the device comprises the following components: the test box comprises a box body with an upper opening and a lower opening, wherein the upper opening of the box body is provided with an upper sealing plate in a lifting manner, the lower part of the box body is provided with a socket, the lower sealing plate is inserted in the box body in a moving manner along the length direction of the box body, the bottom of the upper sealing plate is provided with three shield tail brushes to be tested, the three shield tail brushes to be tested are arranged at intervals along the length direction of the box body, the two sides of each shield tail brush to be tested are attached to the inner side wall of the box body, rear protection plates of the shield tail brushes to be tested are elastically pressed against the lower sealing plate, a sealed grease cavity is formed between the rear protection plates of the adjacent shield tail brushes to be tested, and a sealed muddy water cavity is formed between the first rear protection plate and the inner side wall of the box body; the water injection device is connected with the muddy water cavity; and the oil injection device is connected with the grease cavity. The invention solves the problem that the shield tail brush has large difference between theoretical consumption and actual consumption by adopting a traditional grease amount calculation method.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a grease metering device for a shield tail brush and a grease metering method thereof.
Background
The shield tail machine is used for urban underground rail transit construction, the shield tail brush is a safety barrier for underground construction of the shield machine, and different geological conditions and burial depths have different requirements on the form and the size of the shield tail brush. Different shield tail brushes consume different amounts of grease in each ring under different soil pressures. On the basis of ensuring the construction safety, the shield tail grease consumption of shield construction is measured, so that the engineering cost of construction enterprises can be saved, and meanwhile, green construction can be practiced to reduce the damage of construction to the environment.
The traditional grease amount calculation has the following disadvantages:
the method is calculated according to a theoretical formula, and the core of the method is an empirical algorithm by assuming that shield tail grease forms an oil film with a certain thickness outside a duct piece and multiplying the oil film by a propelling distance and a use coefficient to obtain a theoretical dosage.
According to the traditional grease amount calculation, the influence of the front and rear pressure difference of a shield tail brush and the propelling speed of a shield machine on the grease consumption is not considered, the using amount is obtained only from the propelling distance, and the theoretical defect exists.
Disclosure of Invention
In order to overcome the defects in the prior art, a grease metering device and a grease metering method for a shield tail brush are provided so as to solve the problem that the gap between the theoretical amount and the actual consumption of the shield tail brush is large by adopting a traditional grease amount calculation method.
In order to achieve the above object, there is provided a grease metering device for a shield tail brush, comprising:
the test box comprises a box body, wherein the box body is provided with an upper opening end and a lower opening end, the upper opening end is installed on an upper sealing plate used for sealing the upper opening end in a lifting manner, a socket is formed in the lower part of the box body, a lower sealing plate used for sealing the lower opening end is movably inserted into the socket along the length direction of the box body, three shield tail brushes to be tested are installed at the bottom of the upper sealing plate in the same direction, the three shield tail brushes to be tested are arranged at intervals along the length direction of the box body, each shield tail brush to be tested is arranged along the width direction of the box body, two sides of the shield tail brushes to be tested in the width direction are attached to the inner side wall of the box body, a rear protective plate of each shield tail brush to be tested is elastically pressed against the lower sealing plate, a sealed grease cavity is formed between the rear parts of two adjacent shield tail brushes to be tested, and a sealed muddy water cavity is formed between the rear part of the first shield tail brush to be tested and the inner side wall of the box body;
the water injection device is connected to the muddy water cavity; and
and the oil injection device is connected to the grease cavity.
Further, the oiling device includes:
the oil outlet is formed in the cylinder body and connected to the grease cavity;
the piston piece is movably arranged in the cylinder body along the axial direction of the cylinder body, a sealed accommodating space communicated with the oil outlet is formed between the piston piece and the cylinder body, and grease is contained in the accommodating space; and
and the injection and push oil cylinder is used for driving the piston piece and is connected to the piston piece.
Further, a displacement sensor is mounted on the piston member.
Further, the barrel is provided with an input hole communicated with the accommodating space, the input hole is connected with an oil storage tank through a pipeline, and an oil transfer pump is installed on the pipeline.
Furthermore, the cylinder body and the injection and push oil cylinder are respectively and fixedly arranged on the integrated platform.
Furthermore, a translation oil cylinder is installed on the integrated platform and arranged along the length direction of the box body, and the telescopic end of the translation oil cylinder is connected with the lower sealing plate.
Further, the lateral wall of the relative both sides of box is vertical installs jacking cylinder, two jacking cylinder's flexible end extends the top of box and be connected with the supporting crossbeam, the supporting crossbeam is connected with the jib, the jib extends in the upper end and connect in go up the top of shrouding.
Further, the test box still includes seal assembly, the box with go up the shrouding, down the shrouding reaches install respectively between the shield tail brush that awaits measuring seal assembly.
The invention provides a grease metering method for a grease metering device of a shield tail brush, which comprises the following steps:
lifting the upper sealing plate to enable the distance between the upper sealing plate and the lower sealing plate to be equal to the actual distance between the shield tail of the shield tunneling machine and the duct piece;
the oil injection device is used for filling oil into the two oil cavities;
the water injection device is used for filling water into the muddy water cavity, so that the initial pressure value in the muddy water cavity is lower than the initial pressure value in the grease cavity by a preset difference value;
moving a lower sealing plate towards the front of the shield tail brush to be detected, enabling the lower sealing plate to translate towards the front of the shield tail brush to be detected at a propelling speed during tunneling of a shield tunneling machine, and simultaneously continuing injecting water and grease, so that the pressure in a muddy water cavity is adapted to muddy water pressure borne by a shield tail during tunneling of the shield tunneling machine, and the pressure in the muddy water cavity is always lower than the pressure in a grease cavity by a preset difference value;
after the lower seal plate is translated, monitoring the pressure value in the grease cavity, and after the pressure value in the grease cavity is reduced, injecting supplementary grease into the grease cavity by the oil injection device so as to maintain the pressure value in the grease cavity;
and after the lower sealing plate is translated for a preset time, obtaining the total supplement amount of the supplemented grease, wherein the grease consumption of the shield tail brush to be detected is the total supplement amount under the muddy water pressure, the propelling speed and the preset time.
The test box for the grease metering device of the shield tail brush has the advantages that the upper sealing plate simulates a shield tail, the lower sealing plate simulates a duct piece, the upper sealing plate is lifted to adjust the gap between the upper sealing plate and the lower sealing plate so as to simulate the size of the gap between the shield tail and the duct piece, the lower sealing plate is moved along the length direction of the box body so as to simulate the relative movement between the shield tail and the duct piece during shield tunneling, the box body is internally provided with three shield tail brushes to be tested to form a sealed muddy water cavity and a grease cavity, grease is respectively injected into the muddy water cavity and the grease cavity through the water injection holes and the oil injection holes, the bearing capacity and the sealing capacity of the shield tail brush are statically simulated, and the grease consumption of the shield tail brush is more accurately and reliably measured under the condition that the lower sealing plate is translated to dynamically simulate the propelling state of a shield tunneling machine. Furthermore, water is injected into the muddy water cavity through the water injection hole and is used as pressure muddy water in the tunneling process of the medium simulation shield tunneling machine, the detected tightness of the shield tail brush to be detected is stricter than that of the pressure muddy water, and the performance of the shield tail brush can be accurately detected. The grease metering device for the shield tail brush can quickly and efficiently detect the performance and the grease consumption of the single shield tail brush, provides a theoretical basis for shield tail brush type selection of a shield machine, and avoids high risk brought to engineering construction by empirical type selection. The grease metering device for the shield tail brush can be used for testing a single shield tail brush, and is economical and efficient in test and low in test cost.
Drawings
Fig. 1 is a schematic structural diagram of a grease metering device for a shield tail brush according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an internal structure of the box according to the embodiment of the present invention.
Fig. 3 is a sectional view of a mud cavity of an embodiment of the present invention.
Fig. 4 is a schematic view of a connection node between the third sealing member and the lower sealing plate according to the embodiment of the present invention.
FIG. 5 is a front view of a mud chamber of an embodiment of the present invention.
Fig. 6 is a schematic structural view of a shield tail brush according to an embodiment of the present invention.
Fig. 7 is a schematic view of a state in which the second seal member of the embodiment of the present invention is mounted on the shield tail brush.
FIG. 8 is a cross-sectional view of a second seal according to an embodiment of the present invention.
Fig. 9 is a schematic structural view of the bottom of the upper sealing plate according to the embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a schematic structural view (a water filling device is not shown) of a grease metering device for a shield tail brush according to an embodiment of the present invention, fig. 2 is a schematic structural view of an interior of a case according to an embodiment of the present invention (a side plate of one side of the case is particularly hidden to clearly show an interior structure of the case), fig. 3 is a cross-sectional view of a muddy water chamber according to an embodiment of the present invention (a side portion of one side of the case is transparentized to clearly show a position of a third sealing member), fig. 4 is a schematic connection node of the third sealing member and a lower sealing plate according to an embodiment of the present invention, fig. 5 is a front view of the muddy water chamber according to an embodiment of the present invention, fig. 6 is a schematic structural view of the shield tail brush according to an embodiment of the present invention, fig. 7 is a schematic structural view of a state that the second sealing member according to an embodiment of the present invention is mounted on the shield tail brush, fig. 8 is a cross-sectional view of the second sealing member according to an embodiment of the present invention, and fig. 9 is a schematic structural view of a bottom portion of an upper sealing plate according to an embodiment of the present invention.
Referring to fig. 1 to 9, the present invention provides a grease metering device for a shield tail brush, including: a test chamber, a water injection means and an oil injection means 62.
Specifically, the test box includes: a box body 11, an upper closing plate 12 and a lower closing plate 13.
The case 11 has an upper open end and a lower open end. The lower part of the box body 11 is provided with a socket.
In this embodiment, the box 11 is a box without a bottom and a cover. The box body comprises four side plates which are connected end to form the box body. The box body 11 is erected on the integration table 6 through a steel structure frame body. The steel structure support body includes support and carrier bar. Four supports are installed on the integration platform and are arranged right below four corner parts of the box body. Every two supports are connected with a bearing beam in a supporting mode, and the bearing beams are arranged along the length direction of the box body. A relatively long side plate of the box body is arranged on a bearing beam. The socket is opened at the lower part of a relatively short side plate of the box body. The inside width adaptation of box 11 is in the width of single shield tail brush that awaits measuring.
The lower closing plate 13 is inserted into the insertion opening so as to be movable in the longitudinal direction of the case 11. The lower closing plate is used for closing the lower opening end of the box body.
The upper closing plate 12 is installed in the upper opening end of the box body in a liftable manner, and the upper closing plate is used for closing the upper opening end.
The number of the shield tail brushes to be tested is three, and the three shield tail brushes to be tested are arranged in the same direction to simulate three shield tail brushes of a shield tail of the shield tunneling machine.
In the embodiment, the shield tail brush to be tested comprises a bottom plate 21, a front protection plate 22, a rear protection plate 23 and brush wires 24. The front protective plate and the rear protective plate are clamped on the brush wire and connected to the bottom plate. And thirdly, a bottom plate 21 of the shield tail brush to be tested is arranged at the bottom of the upper sealing plate 12 through a bolt fastening piece, so that the bottom plate is tightly attached to the bottom of the upper sealing plate. The three shield tail brushes to be tested are arranged at intervals along the length direction of the box body 11. Each shield tail brush to be tested is arranged along the width direction of the box body 11. The both sides on the width direction of the shield tail brush that awaits measuring are laminated in the inside wall of box 11. The bottom of the rear protection plate 23 of the shield tail brush to be tested is elastically pressed against the lower sealing plate 13.
Thus, as shown in fig. 2, the three shield tail brushes to be tested divide the internal cavity of the box body into at least three cavities. Specifically, the front protection plate and the rear protection plate of the shield tail brush to be tested are taken as references and taken as the front-back direction, namely, one side of the front protection plate of the shield tail brush to be tested is the front side, and one side of the rear protection plate of the shield tail brush to be tested is the rear side. A sealed muddy water cavity a is formed between the rear protective plate 23 of the first shield tail brush to be tested and the inner side wall of the box body 11. Two sealed grease cavities are formed between the rear protection plates 23 of the two adjacent shield tail brushes to be tested, namely a front grease cavity b close to the muddy water cavity a and a rear grease cavity c far away from the muddy water cavity a. The relatively longer side plate of the box body 11 is provided with an oil filling hole communicated with the grease cavity and a water filling hole communicated with the muddy water cavity a. In this embodiment, oil injection holes of the front grease chamber b and the rear grease chamber c are respectively opened in the relatively long side plate of the case 11.
In the present embodiment, the oil filler 62 is attached to the oil filler hole. The water injection hole is connected with a water injection device.
The test box of the grease metering device for the shield tail brush is characterized in that the upper sealing plate simulates a shield tail, the lower sealing plate simulates a pipe piece, the upper sealing plate is lifted to adjust the gap between the upper sealing plate and the lower sealing plate so as to simulate the size of the gap between the shield tail and the pipe piece, the lower sealing plate is moved along the length direction of the box body so as to simulate the relative movement between the shield tail and the pipe piece during shield tunneling, three shield tail brushes to be tested are arranged in the box body to form a sealed muddy water cavity and a grease cavity, and grease is respectively injected into the muddy water cavity and the grease cavity through the water injection holes and the oil injection holes, so that the bearing capacity and the sealing capacity of the shield tail brush are statically simulated, and the grease consumption of the shield tail brush is more accurately and reliably measured when the lower sealing plate is translated to dynamically simulate the propelling state of a shield tunneling machine. Furthermore, water is injected into the muddy water cavity through the water injection hole and is used as pressure muddy water in the tunneling process of the medium simulation shield tunneling machine, the tightness of the detected shield tail brush to be detected is stricter than that of the pressure muddy water, and the performance of the shield tail brush can be accurately detected. The grease metering device for the shield tail brush can quickly and efficiently detect the performance and the grease consumption of the single shield tail brush, provides a theoretical basis for shield tail brush type selection of a shield machine, and avoids high risk brought to engineering construction by empirical type selection. The grease metering device for the shield tail brush can be used for testing a single shield tail brush, and is economical and efficient in test and low in test cost.
The oil injection device 62 includes a cylinder 621, a piston member, an injection cylinder 622, an oil reservoir 623, and an oil transfer pump.
An oil outlet is formed in the cylinder body 621 and connected to the grease cavity through an oil filling pipeline. In this embodiment, the quantity of barrel is two sets, and two grease chambeies are the one-to-one connection barrel respectively. The piston piece can be movably arranged in the barrel body along the axial direction of the barrel body, a sealed accommodating space communicated with the oil outlet is formed between the piston piece and the barrel body, and grease is contained in the accommodating space. An injection cylinder 622 is connected to the piston member. The injection cylinder 622 is used for driving the piston piece so as to inject the grease in the accommodating space into the grease cavity through the grease injection pipeline.
The cylinder body is provided with an input hole communicated with the accommodating space, the input hole is connected to the oil storage tank through an oil conveying pipeline, and an oil conveying pump is installed on the oil conveying pipeline. The first end of oil pipeline is connected in the oil storage tank, and the second end of oil pipeline is connected in the input hole of barrel.
In a preferred embodiment, a displacement sensor is mounted on the piston member. The displacement sensor is used for acquiring the displacement of the piston piece in the axial direction of the cylinder body in the cylinder body so as to calculate the total supplement amount of the supplemented grease.
The water injection device comprises a water storage tank, a water delivery pipeline, an air compressor and a water delivery pump. The water delivery pump is arranged on the water delivery pipeline. The air compressor machine is connected in the water storage tank, and the first end of hydraulic pipeline is connected in the air compressor machine, and the second end of hydraulic pipeline is connected in the water filling hole. The pressure gas of the air compressor realizes the fine adjustment of the water pressure.
The water injection device and the oil injection device 62 are integrally mounted on the integration platform 6. The cylinder body and the injection and push oil cylinder are respectively fixedly arranged on the integration platform.
Furthermore, pressure sensors are respectively arranged in the muddy water cavity and the grease cavity, and the pressure sensors are used for collecting pressure values in the muddy water cavity and the grease cavity in real time.
As a preferred embodiment, the outer side walls of two opposite sides of the box body 11 are vertically provided with the jacking cylinders 4. The telescopic ends of the two jacking cylinders 4 extend to the upper part of the box body 11 and are connected with a supporting beam 41, the supporting beam 41 is connected with a suspender 42, and the suspender 42 extends to the upper opening end and is connected with the top of the upper sealing plate 12.
Specifically, the outside of the relatively short side plate of the box body is connected with a platform plate. Jacking cylinder is vertical to be set up on the landing slab, and jacking cylinder's stiff end welded connection is on the landing slab.
Two positioning plates 111 are fixedly mounted outside the box body 11. The two positioning plates 111 are disposed opposite to each other. The positioning plate 111 is provided with a through hole, and the lower sealing plate 13 is movably inserted in the through hole. The positioning plate is connected to the outside of the relatively short side plate of the box body. The through hole of the positioning plate is aligned with the socket of the box body.
As a preferred embodiment, the integration platform 6 is provided with a translation cylinder 5, the translation cylinder 5 is arranged along the length direction of the box body 11, and the telescopic end of the translation cylinder 5 is connected to the lower sealing plate 13. Furthermore, the translation oil cylinder is arranged between the two bearing beams, and the fixed end of the translation oil cylinder is fixedly connected to the bearing beams. The bottom fixedly connected with otic placode of shrouding down, the flexible end of translation hydro-cylinder is connected in the otic placode.
As a preferred embodiment, the shield tail brush performance testing device of the present invention further comprises a sealing assembly 3. Specifically, the sealing assemblies 3 are respectively installed between the box body 11 and the upper sealing plate 12, between the lower sealing plate 13 and between the box body and the shield tail brush to be tested.
Specifically, the seal assembly 3 includes: a first seal 31, a second seal 32, a third seal 33 and a fourth seal 34.
A first seal 31 is provided between the upper closure plate 12 and the container body 11. The first seal 31 is mounted to the upper closure plate 12 in a single turn around the periphery of the upper closure plate 12.
The second sealing element 32 is arranged between the rear protective plate 23 of the shield tail brush to be tested and the box body 11. The second sealing member 32 is installed at a side portion of the rear protection plate 23, and the second sealing member 32 is provided along a length direction of the rear protection plate 23. The upper end of the second sealing member 32 is mounted on the base plate and extends upward to be connected to the first sealing member 31.
For the grease cavities (the front grease cavity b and the rear grease cavity c), the first sealing element, the second sealing element and the third sealing element form lateral sealing closed loops at two opposite sides in the width direction of the shield tail brush to be tested.
A fourth seal 34 is provided to seal off the gap between the spigot and the lower closure plate 13. The fourth packing 34 is installed on the inner sidewall of the case 11. In the muddy water chamber a, the fourth sealing element, the first sealing element, the second sealing element (the second sealing element on the side of the first shield tail brush to be tested with the front-back direction of the shield tail brush to be tested as the reference) and the third sealing element form a lateral sealing closed loop of the muddy water chamber.
The sealing assembly has the function of blocking leakage of two opposite sides of the shield tail brush to be tested in the width direction, and therefore the accuracy of a performance test result of the shield tail brush to be tested is improved.
As a preferred embodiment, referring to fig. 9, a first receiving groove is formed on a side surface of the upper sealing plate 12. The first receiving groove is provided with a circle along the circumferential direction of the upper closing plate 12. The first side of the first sealing member 31 is embedded in the first receiving groove, and the second side of the first sealing member 31 presses against the inner side wall of the box 11.
In the present embodiment, the first seal 31 is a rubber seal.
In the embodiment, referring to fig. 6 to 8, the width of the rear protection plate 23 is larger than that of the front protection plate 22 of the shield tail brush to be measured. The bottom plate 21 is provided with a third receiving groove 210 aligned with the side portion of the rear protection plate 23, and the third receiving groove 210 is disposed along the direction of the plate surface of the rear protection plate 23 and is communicated with the first receiving groove.
Referring to fig. 8, a second receiving groove 320 is formed on the circumferential surface of the second sealing element 32, and the second receiving groove 320 is disposed along the length direction (i.e., the axial direction) of the second sealing element 32. The side portion of the rear protection plate 23 is fitted in the second receiving groove 320 of the lower end of the second sealing member 32. The upper end of the second sealing member 32 is embedded in the third receiving groove 210 at the side of the bottom plate, and the second sealing member 32 is pressed against the inner side wall of the box body 11. The upper end of the second seal member is connected to the first seal member.
In the present embodiment, the second seal 32 is a round strip-shaped rubber strip.
As a preferred embodiment, referring to fig. 3 and 4, a fourth receiving groove is formed on an inner side wall of the box 11, a first side of the third sealing element 33 is embedded in the fourth receiving groove, a lower portion of a second side of the third sealing element 33 presses against the lower sealing plate 13, and an upper portion of the second side of the third sealing element 33 presses against a lower end of the second sealing element 32.
In this embodiment, the third seal 33 is a packing seal.
In a preferred embodiment, the fourth sealing element 34 is a rubber pad, and the lower end of the rubber pad is pressed against the upper surface of the lower sealing plate 13.
The invention provides a method for testing the shield tail brush performance of a grease metering device for a shield tail brush, which comprises the following steps:
s1: go up the shrouding in the lift for go up the shrouding and equal the shield tail of shield structure machine and the actual distance between the section of jurisdiction down between the shrouding.
Before the shield tail brush to be tested is formally tested, the upper sealing plate is lifted, so that the distance between the upper sealing plate and the lower sealing plate is equal to the actual distance between the shield tail of the shield tunneling machine and the duct piece, and the actual distance between the shield tail of the shield tunneling machine and the duct piece is simulated.
S2: and injecting grease into a grease cavity (front grease cavity b) adjacent to the muddy water cavity a through the oil injection hole until the grease breaks through the first shield tail brush to be tested forward and permeates into the muddy water cavity a.
After the distance between the upper sealing plate and the lower sealing plate is adjusted to meet the actual distance, grease is injected into the forward grease cavity b through the oil injection hole by the grease injection device until the grease breaks through the first shield tail brush to be tested forward and permeates into the muddy water cavity a.
S3: when the grease breaks through the first shield tail brush to be detected forward, the grease pressure in the grease cavity (front grease cavity b) is detected to obtain the grease initial pressure of the shield tail brush to be detected.
When a pressure sensor in the front grease cavity b is used for detecting that grease breaks down the first shield tail brush to be detected forwards, the grease pressure in the front grease cavity b is the grease initial pressure of the shield tail brush to be detected.
S4: after the grease initial pressure is obtained through detection, water is injected into the muddy water cavity a through the water injection hole, so that the muddy water pressure in the muddy water cavity a reaches the muddy water initial pressure, and the muddy water initial pressure is smaller than the grease initial pressure.
After the initial grease pressure of the shield tail brush to be tested is obtained, the maximum bearing capacity of the shield tail brush to be tested can be formally tested.
Preferably, the initial state of the shield tail brush performance testing device of the invention is restored.
And after the initial state is recovered, injecting grease into the front grease cavity b, so that the grease pressure of the front grease cavity b reaches the initial grease pressure.
After the grease pressure of the front grease cavity b reaches the grease initial pressure, water is injected into the muddy water cavity a through the water injection hole, so that the muddy water pressure in the muddy water cavity a reaches the muddy water initial pressure. The initial pressure of the muddy water is less than the initial pressure of the grease.
In this embodiment, the initial pressure of the slurry is lower than the initial pressure of the grease by a predetermined difference.
Further, the initial muddy water pressure = the initial grease pressure-0.5 bar.
And after the pressure value of the muddy water cavity reaches the initial muddy water pressure, closing the water injection device to maintain the pressure value of the muddy water cavity for a preset time. In this example, the pressure value of the muddy water chamber was maintained for 10 minutes.
If the pressure value of the mud cavity after 10 minutes is reduced to be in the range of 0-0.1bar, the next step can be carried out.
If the pressure value of the muddy water cavity after 10 minutes is reduced to exceed the range of 0-0.1bar, the tightness of the box body and the sealing assembly of the shield tail brush performance testing device is re-detected and maintained. And after the tightness is detected and maintained, water is injected again for detection until the pressure value of the muddy water cavity is reduced to 0-0.1bar within 10 minutes, and then the next step is carried out.
S5: and after the muddy water pressure reaches the initial muddy water pressure, continuously injecting water and grease, and always keeping the muddy water pressure lower than the grease pressure by a preset difference value until the water or the grease penetrates through the second shield tail brush to be tested backwards and permeates into the other grease cavity (the rear grease cavity c).
And after the sealing performance of the muddy water cavity is detected, continuously injecting water into the muddy water cavity and oil into the front oil cavity b, and always keeping the muddy water pressure lower than the oil pressure by a preset difference value until water or oil penetrates through a second shield tail brush to be detected backwards and permeates into another oil cavity (namely a rear oil cavity c).
S6: and when the water or the grease is used for puncturing the second shield tail brush to be detected backwards, detecting the grease pressure to obtain the maximum bearing capacity of the shield tail brush to be detected.
And recording the internal pressure value of the front grease cavity b when water or grease penetrates backwards through the second shield tail brush to be tested, wherein the pressure value is the maximum bearing capacity of the shield tail brush to be tested.
The invention provides a grease metering method for a grease metering device of a shield tail brush.
Step S10: go up the shrouding in the lift for go up the shrouding and equal the shield tail of shield structure machine and the actual distance between the section of jurisdiction down between the shrouding.
Step S20: the oil filling device fills the two oil cavities with oil.
Step S30: the water injection device fills water into the muddy water cavity, so that the initial pressure value in the muddy water cavity is lower than the initial pressure value in the grease cavity by a preset difference value, and the shield tail brush to be tested is prevented from being backwards punctured by the water in the muddy water cavity.
Step S40: move lower shrouding towards the place ahead of the shield tail brush that awaits measuring for propulsion speed when lower shrouding is tunneled with the shield constructs the shield tail brush's the place ahead translation of awaiting measuring, and continue simultaneously water injection and grease, make pressure in the muddy water chamber adapt in the muddy water pressure that the shield tail that the shield constructs when tunneling bore, just pressure in the muddy water chamber is less than the pressure in the grease chamber with predetermineeing the difference all the time.
The translation hydro-cylinder is towards shrouding under the place ahead of the shield tail brush that awaits measuring with one predetermined speed translation for the propulsion speed when the shrouding simulation is tunneled with the shield constructs the machine down is to the place ahead translation of the shield tail brush that awaits measuring, and continues water and grease injection simultaneously, makes the muddy water pressure that the shield tail that the pressure adaptation in the muddy water chamber when the shield constructs the machine and tunnel bore, and the pressure in the muddy water chamber is less than with predetermineeing the difference all the time the pressure in the grease chamber. The predetermined difference is 0.5bar.
Step S50: after the lower sealing plate is translated, monitoring the pressure value in the grease cavity, and after the pressure value in the grease cavity is reduced, supplementing and injecting grease into the grease cavity by the oil injection device, so that the pressure value in the grease cavity is maintained to be higher than the pressure value in the muddy water cavity by a preset difference value.
Step S60: and after the lower sealing plate is translated for a preset time, obtaining the supplement total amount of the supplemented and injected grease, wherein the grease consumption of the shield tail brush to be detected is the supplement total amount under the muddy water pressure, the propelling speed and the preset time.
In this embodiment, a pressure sensor, a displacement sensor or a pressure gauge is used to monitor and obtain the pressure value and the displacement value, and the specific steps are not described herein again.
And the total grease supplement amount of the shield tail brush to be measured = the accumulated displacement of the piston piece in the process of supplementing and injecting the grease x the area of the inner cross section of the cylinder body.
And calculating the theoretical grease consumption of the single-ring pipe joint by multiplying the grease consumption of the shield tail brush to be measured by the total number of the shield tail brushes on the shield machine.
The grease metering device for the shield tail brush further comprises a controller, wherein the controller is respectively connected with the pressure sensor in the muddy water cavity, the pressure sensor in the grease cavity, the displacement sensor, the translation oil cylinder, the jacking oil cylinder, the injection and push oil cylinder, the oil delivery pump, the water delivery pump and the like, and the grease metering device for the shield tail brush is cooperatively controlled to carry out corresponding performance measurement and grease recording based on the testing method and the grease metering method for the shield tail brush.
It should be noted that the structures, the proportions, the sizes, and the like shown in the drawings attached to the present specification are only used for matching the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions of the present invention, so that the present invention has no technical essence, and any modifications of the structures, changes of the proportion relation, or adjustments of the sizes, can still fall within the scope of the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
While the present invention has been described in detail and with reference to the embodiments thereof as shown in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the invention is to be defined by the scope of the appended claims.
Claims (8)
1. A grease metering method adopting a grease metering device for a shield tail brush is characterized by comprising the following steps:
providing a grease metering device for a shield tail brush, wherein the grease metering device for the shield tail brush comprises a test box, a water injection device and an oil injection device, the test box comprises a box body, the box body is provided with an upper opening end and a lower opening end, an upper seal plate for sealing the upper opening end is arranged in the upper opening end in a lifting manner, a socket is formed in the lower part of the box body, a lower seal plate for sealing the lower opening end is movably inserted in the socket along the length direction of the box body, three shield tail brushes to be tested are arranged at the bottom of the upper seal plate in the same direction, the three shield tail brushes to be tested are arranged at intervals along the length direction of the box body, each shield tail brush to be tested is arranged along the width direction of the box body, two sides of the shield tail brush to be tested in the width direction are attached to the inner side wall of the box body, the rear protection plate of the shield tail brush to be tested is elastically pressed against the lower seal plate, a sealed grease cavity is formed between the rear protection plates of two adjacent shield tail brushes to be tested, the first shield tail brush to be connected to the upper water injection device, and the distance between the upper seal plate and the upper shield tail mud injection device is equal to the upper seal plate, and the oil injection device, the upper seal plate, and the distance between the upper shield tail shield device and the upper seal plate;
the oil injection device is used for filling oil into the two oil cavities;
the water injection device is used for filling water into the muddy water cavity, so that the initial pressure value in the muddy water cavity is lower than the initial pressure value in the grease cavity by a preset difference value;
moving a lower sealing plate towards the front of the shield tail brush to be tested, so that the lower sealing plate translates towards the front of the shield tail brush to be tested at the propelling speed of the shield tunneling machine during tunneling, and simultaneously continuously injecting water and grease, so that the pressure in the muddy water cavity is adapted to the muddy water pressure borne by the shield tail during tunneling of the shield tunneling machine, and the pressure in the muddy water cavity is always lower than the pressure in the grease cavity by the preset difference value;
after the lower seal plate is translated, monitoring the pressure value in the grease cavity, and after the pressure value in the grease cavity is reduced, injecting supplementary grease into the grease cavity by the oil injection device so as to maintain the pressure value in the grease cavity;
and after the lower sealing plate is translated for a preset time, obtaining the total supplement amount of the supplementary grease, wherein the grease consumption of the shield tail brush to be detected is the total supplement amount under the muddy water pressure, the propelling speed and the preset time.
2. The grease metering method according to claim 1, wherein the grease injection device comprises:
the oil outlet is connected with the oil cavity;
the piston piece is movably arranged in the cylinder body along the axial direction of the cylinder body, a sealed accommodating space communicated with the oil outlet is formed between the piston piece and the cylinder body, and grease is contained in the accommodating space; and
and the injection and push oil cylinder is used for driving the piston piece and is connected to the piston piece.
3. A method of metering grease according to claim 2 wherein a displacement sensor is mounted on the piston member.
4. The grease metering method according to claim 2, wherein the cylinder is provided with an input hole communicated with the accommodating space, the input hole is connected with an oil storage tank through a pipeline, and the pipeline is provided with an oil transfer pump.
5. The grease metering method according to claim 2, wherein the cylinder body and the injection cylinder are respectively fixedly mounted on an integrated platform.
6. A grease metering method according to claim 5, characterized in that a translation oil cylinder is mounted on the integration platform, the translation oil cylinder is arranged along the length direction of the box body, and the telescopic end of the translation oil cylinder is connected to the lower sealing plate.
7. The grease metering method according to claim 1, wherein jacking cylinders are vertically mounted on outer side walls of two opposite sides of the box body, telescopic ends of the two jacking cylinders extend to the upper side of the box body and are connected with supporting beams, the supporting beams are connected with hanging rods, and the hanging rods extend into the upper opening end and are connected to the top of the upper sealing plate.
8. The grease metering method according to claim 1, wherein the test box further comprises sealing components, and the sealing components are respectively installed between the box body and the upper sealing plate, between the box body and the lower sealing plate, and between the box body and the shield tail brush to be tested.
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| CN114136680B (en) * | 2021-11-29 | 2024-03-19 | 中铁隧道局集团有限公司 | Laser type shield/TBM grease real-time measurement device and measurement method |
| CN114136394B (en) * | 2021-11-29 | 2024-07-19 | 盾构及掘进技术国家重点实验室 | Pull-wire type shield/TBM grease real-time measurement device and measurement method thereof |
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| CN210221425U (en) * | 2019-09-05 | 2020-03-31 | 中铁工程装备集团有限公司 | Experimental device for be used for shield to construct tail brush sealing performance test |
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| JP2898788B2 (en) * | 1990-11-29 | 1999-06-02 | 日本グリース株式会社 | Brush seal for tail of shield machine and its manufacturing method |
| JP2002021486A (en) * | 2000-07-05 | 2002-01-23 | Taisei Corp | Tail bush replacing device and replacing method for shield machine |
| CN102590481B (en) * | 2012-03-08 | 2014-01-22 | 石家庄铁道大学 | Method for testing shield tail sealing oil pumping characteristic of shield tunneling machine |
| CN103437773B (en) * | 2013-09-05 | 2015-07-08 | 中铁隧道集团有限公司 | Experimental equipment for shield tail brush |
| CN104314580B (en) * | 2014-10-11 | 2016-07-06 | 北京铁五院工程机械有限公司 | The tail sealing brush monitoring shield tail grease cavity pressure and shield machine for shield machine |
| CN105300603B (en) * | 2015-10-27 | 2017-09-29 | 上海隧道工程有限公司 | The testing equipment of class rectangle shield tail sealing performance |
| CN107449569B (en) * | 2017-09-29 | 2023-08-29 | 中铁隧道局集团有限公司 | Shield tail brush sealing performance testing device and testing method thereof |
| CN109839496B (en) * | 2019-04-01 | 2024-05-07 | 粤水电轨道交通建设有限公司 | Shield tail sealing grease high-simulation detection equipment and detection method |
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| CN106226003A (en) * | 2016-09-27 | 2016-12-14 | 中铁工程装备集团有限公司 | Shield machine shield ventral brush sealing property tester and test method |
| CN210221425U (en) * | 2019-09-05 | 2020-03-31 | 中铁工程装备集团有限公司 | Experimental device for be used for shield to construct tail brush sealing performance test |
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