CN214106600U - Skid-mounted profile control liquid distribution system - Google Patents

Abstract

The application relates to a skid-mounted profile control liquid distribution system, which comprises a stirrer body, a supporting mechanism and a liquid distribution mechanism, wherein the stirrer body comprises a base and a stirring tank; the stirring tank is fixedly arranged on the base; the supporting mechanism is fixedly arranged on the base, and the liquid distribution mechanism is fixedly arranged on the supporting mechanism; the liquid distribution mechanism comprises a liquid conveying assembly, a balance assembly and a blanking assembly, the balance assembly comprises a bottom plate, a lever, a balance seat, a main bearing bin and an auxiliary bearing bin, the balance seat is fixedly arranged on the bottom plate, the lever is hinged with the balance seat, and the main bearing bin and the auxiliary bearing bin are respectively and fixedly arranged at two ends of the lever; the main bearing bin is positioned under the blanking assembly, and the auxiliary bearing bin is positioned under the infusion assembly; the main bearing bin and the auxiliary bearing bin are both communicated with the stirring cavity of the stirring tank. The electronic control instrument has the effect of improving the defect that the electronic control instrument is easy to damage when in use.

Description

Skid-mounted profile control liquid distribution system

Technical Field

The application relates to the field of fluid distribution systems, in particular to a skid-mounted profile control fluid distribution system.

Background

In the process of oil exploitation, in order to adjust the water absorption profile of a water injection interval and improve the oil field recovery efficiency, profile control operation is required, namely, a profile control agent is injected from a water injection well to block a high permeable formation, the profile control agent is required to be prepared before the high permeable formation, and various profile control agent raw materials are mixed and then added with water in proportion and stirred to obtain the profile control agent.

In the related art, the chinese application with application number 201711155850.9 discloses a quantitative water-adding mixer, which comprises a mixer support and a mixer box, wherein two bearing seats are respectively fixed on the inner walls of the two sides of the mixer support, the two bearing seats are respectively fixedly connected with rolling bearings, the inner rings of the two rolling bearings are alternately connected with rotating shafts arranged on the two sides of the mixer box, a fixed block is arranged at the bottom end of the mixer box, a motor support is arranged at the top end of the mixer box, the bottom end of the motor support is fixedly connected with one end of a casing of a motor, an output shaft of the motor is fixedly connected with one end of a hydraulic cylinder, a hydraulic rod of the hydraulic cylinder is fixedly connected with one end of a mixing shaft through a coupler, a plurality of mixing paddles are arranged at the bottom end of the mixing shaft, a water pump support is arranged on one side of the mixer support, and a water pump is arranged at the top end of the water pump support, the delivery port of water pump is equipped with the outlet pipe, the outlet pipe passes through the end fixed connection that intakes of connecting pipe and intelligent flow ration controller, the middle part of connecting pipe is equipped with turbine formula flowmeter, the water inlet fixed connection of connecting pipe and agitator tank is passed through to the play water end of intelligent flow ration controller, the motor passes through motor switch, pneumatic cylinder and passes through pneumatic cylinder switch, the water pump passes through water pump switch and intelligent flow ration controller and pass through the equal and power electric connection of controller switch.

The principle of the scheme is as follows: when in work, the staff controls the extension of the hydraulic rod of the hydraulic cylinder through the switch of the hydraulic cylinder to ensure that the stirring shaft is in a proper position, setting a quantitative value for the intelligent flow quantitative controller through a controller switch, pressing a put-in key after the quantitative value is set, the water pump is switched on through the water pump switch, the turbine flowmeter starts to work, the right window of the intelligent flow quantitative controller starts to accumulate according to the left quantitative value, the water pump is automatically switched off after the quantitative value is reached, the water pump is automatically switched off after the quantitative value is ended and the water is added, the materials to be stirred are poured into the stirring box, the motor is started through the motor switch, the stirring shaft starts to rotate, the stirring device is used for stirring materials, the motor is turned off after the materials are uniformly stirred, the stirring is stopped, the fixed block is pulled out through a handle arranged on the fixed block after the stirring is finished, and the materials stirred in the stirring box are poured out through the rotation of the rotating shaft.

However, in the above-mentioned solution, in the specific implementation process, the control of the water inflow is mainly determined by the intelligent flow quantitative controller, but the use condition of the profile control mixer is often worse, so the intelligent flow quantitative controller with a complicated structure and a large number of electronic structures is easy to be damaged when in use.

In view of the above-mentioned related art, the inventors consider that there is a drawback that the electronic control device is easily damaged when used.

SUMMERY OF THE UTILITY MODEL

In order to improve the defect that the electronic control appearance damaged easily when using, this application provides a sled dress formula profile control liquid distribution system.

The application provides a sled dress formula profile control fluid distribution system adopts following technical scheme:

a skid-mounted profile control liquid distribution system comprises a stirrer body, a supporting mechanism and a liquid distribution mechanism, wherein the stirrer body comprises a base and a stirring tank; the stirring tank is fixedly arranged on the base; the supporting mechanism is fixedly arranged on the base, and the liquid distribution mechanism is fixedly arranged on the supporting mechanism; the liquid distribution mechanism comprises a liquid conveying assembly, a balance assembly and a blanking assembly, the balance assembly comprises a bottom plate, a lever, a balance seat, a main bearing bin and an auxiliary bearing bin, the balance seat is fixedly arranged on the bottom plate, the lever is hinged with the balance seat, and the main bearing bin and the auxiliary bearing bin are respectively and fixedly arranged at two ends of the lever; the main bearing bin is positioned under the blanking assembly, and the auxiliary bearing bin is positioned under the infusion assembly; the main bearing bin and the auxiliary bearing bin are both communicated with the stirring cavity of the stirring tank.

By adopting the technical scheme, the blanking assembly discharges materials into the main bearing bin, the blanking assembly is closed when the blanking reaches a certain amount, the main bearing bin presses down under the action of gravity and drives the lever to rotate around the balance seat, then the infusion assembly starts to input liquid into the auxiliary bearing bin, the lever is pressed to rotate along with the increase of the liquid amount of the auxiliary bearing bin, and when the lever reaches balance, the liquid amount reaches the required amount in proportion, so that the liquid is proportioned by utilizing a mechanical structure.

Optionally, the infusion subassembly includes transfer line, transfer pump and transfusion valve, the transfer line fixed mounting be in on the supporting mechanism, transfer pump water inlet and water source intercommunication, the transfer pump delivery port with the transfer line water inlet is linked together, transfusion valve fixed mounting be in the transfer line is close to delivery port one end.

Through adopting above-mentioned technical scheme, the transfer pump is followed water source department water intaking and is carried out the pump sending through the transfer line, sets up the transfusion valve in transfer line delivery port one end and is used for controlling the infusion volume to realize liquid ration and pour into.

Optionally, the blanking assembly comprises a blanking pipe and a blanking valve, the blanking pipe is fixedly mounted on the supporting mechanism, a feeding port of the blanking pipe is communicated with the material bin, and the blanking valve is fixedly mounted on the blanking pipe and close to one end of the blanking port of the blanking pipe.

Through adopting above-mentioned technical scheme, accept the storehouse from the material feed bin to main reinforced in, the unloading valve is used for controlling the unloading volume through the unloading pipe to realize the ration of material and feed in.

Optionally, the balance assembly further comprises two sliding plates, the sliding plates are arc-shaped and are fixedly arranged on the bottom plate, and the circle center of the arc is towards the direction of the balance seat; one sliding plate is fixedly arranged on one side of the main bearing bin, which is far away from the auxiliary bearing bin, and the other sliding plate is fixedly arranged on one side of the auxiliary bearing bin, which is far away from the main bearing bin; the main bearing bin and the auxiliary bearing bin are fixedly provided with sliding blocks on the side walls close to the sliding plate, sliding grooves are formed in the sliding plate, and the sliding blocks are arranged in the sliding grooves in a sliding mode.

Through adopting above-mentioned technical scheme, main storehouse and vice storehouse of accepting are connected through the spout slider and are slided from top to bottom along the slide when driving the lever rotation, take place the rotation of horizontal direction when avoiding the lever to rotate around balanced seat and damage the lever.

Optionally, the liquid distribution mechanism further comprises a discharge assembly, the discharge assembly comprises two discharge pipes and two discharge valves, the discharge pipes are respectively and fixedly arranged at the lower ends of the main bearing bin and the auxiliary bearing bin, the discharge pipes penetrate through the bottom plate, and the lower ends of the discharge pipes are located in the stirring cavity of the stirring tank; the discharge valve is fixedly arranged at the lower end of the discharge pipe.

Through adopting above-mentioned technical scheme, the discharge valve is opened when the main material and the liquid of accepting in the storehouse and the vice storehouse of accepting all reach the predetermined amount to it is internal with material and liquid blanking to agitator tank jar through the discharge tube, thereby realizes the ration and joins in marriage liquid.

Optionally, the balancing assembly further includes a triggering assembly, the triggering assembly includes a main pressure switch and an auxiliary pressure switch, the main pressure switch is fixedly disposed on the bottom plate and located right below the main receiving bin, and the auxiliary pressure switch is fixedly disposed on the bottom plate and located right below the auxiliary receiving bin; the auxiliary pressure switch is electrically connected with the infusion valve and the discharge valve below the infusion valve, and the main pressure switch is electrically connected with the discharge valve.

Through adopting above-mentioned technical scheme, when the lever reaches balance, the main storehouse of accepting no longer oppresses main pressure switch, and main pressure switch start control is main to accept in the storehouse below discharge valve and is opened and with the material blanking to the agitator tank afterwards, and vice storehouse of accepting pushes down the vice pressure switch of oppression afterwards, and vice pressure switch start control below discharge valve is opened and is with liquid blanking to the agitator tank in to realize material and liquid ration unloading in proportion.

Optionally, the supporting mechanism comprises two supporting frames, and the supporting frames are fixedly arranged on the base; the bottom plate is fixedly connected with the two support frames respectively.

Through adopting above-mentioned technical scheme, support frame and base are fixed, join in marriage liquid mechanism fixed mounting on the support frame to realize the integral structure, realized sled dress setting.

Optionally, reinforcing rods are symmetrically arranged at the bottom of the support frame, and the reinforcing rods are respectively fixedly connected with the support frame and the bottom plate.

Through adopting above-mentioned technical scheme, constitute triangular structure between anchor strut and base and the support frame and realize the reinforcement to the support frame.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the liquid is quantitatively prepared according to the material quantity by arranging the balance component, and meanwhile, the balance component is designed into a mechanical structure, so that the defect that an electronic control instrument is easy to damage under a severe environment is avoided to a certain extent;

2. through setting up supporting mechanism, will join in marriage the fixed setting of liquid mechanism on supporting mechanism to set up the device into integral structure, be convenient for transportation and installation.

Drawings

FIG. 1 is a schematic structural diagram of a skid-mounted profile control fluid distribution system according to an embodiment of the present application;

FIG. 2 is a perspective cross-sectional view of a skid-mounted profile control fluid distribution system according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a base and a supporting mechanism in a skid-mounted profile control fluid distribution system according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a balance assembly and a discharge assembly of the skid-mounted profile control fluid distribution system according to the embodiment of the present application.

Description of reference numerals: 1. a mixer body; 11. a base; 12. a stirring tank; 13. a stirring motor; 14. a stirring blade; 2. a support mechanism; 21. a support frame; 22. a reinforcing rod; 3. a liquid preparation mechanism; 31. a fluid delivery assembly; 311. a transfusion tube; 312. an infusion pump; 313. a transfusion valve; 32. a balancing component; 321. a base plate; 322. a lever; 323. a balance seat; 324. a main bearing bin; 325. a secondary receiving bin; 3251. a slider; 326. a slide plate; 3261. a chute; 327. a trigger component; 3271. a main pressure switch; 3272. a secondary pressure switch; 33. a blanking assembly; 331. a discharging pipe; 332. a discharge valve; 34. a discharge assembly; 341. a discharge pipe; 342. a discharge valve.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses sled dress formula profile control fluid distribution system. Referring to fig. 1 and 2, the skid-mounted profile control liquid distribution system comprises a mixer body 1, a supporting mechanism 2 and a liquid distribution mechanism 3. The mixer body 1 comprises a base 11 and a mixing tank 12, wherein the mixing tank 12 is fixedly arranged on the base 11 in a welding mode. The supporting mechanism 2 is fixedly arranged on the base 11, and the liquid distribution mechanism 3 is fixedly arranged on the supporting mechanism 2. The liquid distribution mechanism 3 comprises a liquid infusion assembly 31, a balance assembly 32 and a blanking assembly 33, wherein the liquid infusion assembly 31 and the blanking assembly 33 are respectively used for injecting water and blanking, the balance assembly 32 is used for weighing water and materials in proportion, and then the weighed water and materials are blanked into the stirring tank 12, so that a certain amount of materials are proportionally distributed.

Referring to fig. 2, the mixer body 1 further includes a mixing motor 13 and a mixing blade 14, the mixing motor 13 is embedded in the base 11, an output shaft of the mixing motor penetrates through the mixing tank 12, and the mixing blade 14 is welded to the output shaft of the mixing motor 13. When the stirrer works, the stirring motor 13 drives the stirring blades 14 to rotate so as to complete the mixing and stirring of the materials, water and water.

In order to facilitate the installation of the liquid distribution mechanism 3, the supporting mechanism 2 is provided, referring to fig. 3, the supporting mechanism 2 includes two supporting frames 21, the two supporting frames 21 are symmetrically arranged on two sides of the stirring tank 12 and are fixedly welded on the base 11, two reinforcing rods 22 are welded at the bottom of each supporting frame 21, and two ends of each reinforcing rod 22 are respectively fixedly welded with the base 11 and the supporting frame 21. The reinforcing rod 22, together with the base 11 and the support frame 21, forms a triangular structure for reinforcing the support frame 21.

The liquid function is joined in marriage to proportion in this application specifically realizes by joining in marriage liquid mechanism 3, and the unloading of material is carried out at first to during operation unloading subassembly 33, and infusion subassembly 31 begins the water injection afterwards, and balanced subassembly 32 weighs material and water in proportion, and then realizes joining in marriage liquid in proportion.

Referring to fig. 2, the infusion module 31 is specifically provided with an infusion tube 311, an infusion pump 312 and an infusion valve 313, the infusion tube 311 is welded and installed on the support frame 21, a water inlet of the infusion pump 312 is communicated with a water source, a water inlet of the infusion tube 311 is communicated with a water outlet of the infusion pump 312 through threaded connection, and the infusion valve 313 is arranged at one end of the infusion tube 311 close to the water outlet through flange connection. An infusion pump 312 draws water from a water source and pumps the water to the secondary receiving chamber 325 through an infusion tube 311, and an infusion valve 313 is used for controlling the infusion amount.

The blanking assembly 33 comprises a blanking pipe 331 and a blanking valve 332, wherein the blanking pipe 331 is welded on the support frame 21, and the blanking valve 332 is welded on one end of the blanking pipe 331 close to the blanking port. The material is conveyed and dropped into the main receiving bin 324 through a material dropping pipe 331, and a material dropping valve 332 is used for controlling the material dropping amount.

Referring to fig. 4, the balancing assembly 32 includes a bottom plate 321, a lever 322, a balancing seat 323, a main receiving chamber 324 and an auxiliary receiving chamber 325, the bottom plate 321 is welded to the inner wall of the stirring tank 12, the balancing seat 323 is welded to the bottom plate 321, the lever 322 and the balancing seat 323 are hinged through a hinge block, the main receiving chamber 324 is welded to one end of the lever 322, and the auxiliary receiving chamber 325 is welded to the other end of the lever 322. The main receiving bin 324 is positioned right below the blanking assembly 33, and the auxiliary receiving bin 325 is positioned right below the infusion assembly 31.

Further, the balancing assembly 32 further includes two sliding plates 326 and a trigger assembly 327, referring to fig. 4, the sliding plates 326 are welded to the bottom plate 321, one sliding plate 326 is disposed on a side of the main receiving chamber 324 facing away from the auxiliary receiving chamber 325, and the other sliding plate 326 is disposed on a side of the auxiliary receiving chamber 325 facing away from the main receiving chamber 324. A sliding groove 3261 is formed in the sliding plate 326, a sliding block 3251 is welded on the side wall of the main bearing bin 324 and the auxiliary bearing bin 325 facing the sliding plate 326, and the sliding block 3251 can slide up and down along the sliding groove 3261. The trigger assembly 327 includes a main pressure switch 3271 and a sub pressure switch 3272, the main pressure switch 3271 is located below the main receiving chamber 324 and is welded on the bottom plate 321, and the sub pressure switch 3272 is located below the sub receiving chamber 325 and is welded on the bottom plate 321. Main pressure switch 3271 is electrically connected to blanking valve 332, and sub-pressure switch 3272 is electrically connected to infusion valve 313.

When the blanking is started, firstly the blanking valve 332 is opened to blank into the main receiving bin 324 through the blanking pipe 331, in the process, the main receiving bin 324 is pressed downwards to drive the lever 322 to rotate around the balance seat 323, and when the blanking reaches a certain amount, the blanking valve 332 is closed. Then, the infusion valve 313 is opened to start water injection into the secondary receiving bin 325, the lever 322 gradually tends to be balanced along with the increase of the water injection amount, and when the lever 322 is balanced, the water injection amount reaches the required amount in proportion, so that the proportional liquid distribution is realized.

The liquid distribution mechanism 3 further comprises a discharge assembly 34, referring to fig. 4, the discharge assembly 34 comprises two discharge pipes 341 and two discharge valves 342, the two discharge pipes 341 are welded at the lower ends of the main receiving bin 324 and the auxiliary receiving bin 325, the discharge pipes 341 are metal hoses, and the discharge valves 342 are welded at the lower ends of the discharge pipes 341. The discharge valve 342 located below the main receiving chamber 324 is electrically connected to the main pressure switch 3271, and the discharge valve 342 located below the sub receiving chamber 325 is electrically connected to the sub pressure switch 3272.

When the lever 322 reaches balance, the auxiliary receiving bin 325 presses the auxiliary pressure switch 3272, the auxiliary pressure switch 3272 controls the closing of the transfusion valve 313 and the opening of the lower discharge valve 342 to inject water into the stirring tank 12, then the main receiving bin 324 falls to press the main pressure switch 3271, the main pressure switch 3271 controls the opening of the discharge valve 342 below the main receiving bin 324 to discharge materials into the stirring tank 12, then the stirring motor 13 is started to drive the stirring blades 14 to mix and stir the water and the materials, and the liquid preparation process is completed.

The arm length of the lever 322 can be set according to the specific weight of the material and the liquid, in this embodiment, the material and the water are proportioned in a ratio of one to two, so the arm length is set to two to one, that is, the distance from the balance seat 323 to the main receiving bin 324 is twice as long as that from the auxiliary receiving bin 325. The blanking valve 332, the infusion valve 313 and the discharge valve 342 are all set as electric valves.

The implementation principle of a sled dress formula profile control fluid distribution system of the embodiment of this application does: at first, the blanking valve 332 is opened to blank the material to the main receiving bin 324, the blanking belt drives the lever 322 to rotate around the balance seat 323 when the main receiving bin 324 receives the material, and the blanking valve 332 is closed when the blanking reaches a certain amount. Then, the infusion valve 313 is opened to start water injection into the secondary receiving bin 325, the lever 322 gradually tends to be balanced in the water injection process, and when the balance is achieved, the water injection amount reaches the water amount required in proportion.

When the lever 322 is balanced, the auxiliary receiving bin 325 presses the auxiliary pressure switch 3272, the auxiliary pressure switch 3272 controls the infusion valve 313 to be closed and controls the lower discharge valve 342 to be opened to inject water into the stirring tank 12, then the main receiving bin 324 presses the main pressure switch 3271, the main pressure switch 3271 controls the lower discharge valve 342 to be opened after being triggered to discharge materials into the stirring tank 12, and then the stirring motor 13 is started to drive the stirring blades 14 to mix and stir.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a sled dress formula profile control fluid distribution system which characterized in that: the stirring machine comprises a stirring machine body (1), a supporting mechanism (2) and a liquid preparation mechanism (3), wherein the stirring machine body (1) comprises a base (11) and a stirring tank (12); the stirring tank (12) is fixedly arranged on the base (11); the supporting mechanism (2) is fixedly arranged on the base (11), and the liquid distribution mechanism (3) is fixedly arranged on the supporting mechanism (2); the liquid distribution mechanism (3) comprises a liquid infusion assembly (31), a balance assembly (32) and a blanking assembly (33), the balance assembly (32) comprises a bottom plate (321), a lever (322), a balance seat (323), a main bearing bin (324) and an auxiliary bearing bin (325), the balance seat (323) is fixedly arranged on the bottom plate (321), the lever (322) is hinged with the balance seat (323), and the main bearing bin (324) and the auxiliary bearing bin (325) are respectively and fixedly arranged at two ends of the lever (322); the main bearing bin (324) is positioned right below the blanking assembly (33), and the auxiliary bearing bin (325) is positioned right below the infusion assembly (31); the main bearing bin (324) and the auxiliary bearing bin (325) are communicated with a stirring cavity of the stirring tank (12).

2. The skid-mounted profile control fluid distribution system of claim 1, wherein: infusion subassembly (31) include transfer line (311), transfer pump (312) and transfusion valve (313), transfer line (311) fixed mounting be in on supporting mechanism (2), transfer pump (312) water inlet and water source intercommunication, transfer pump (312) delivery port with transfer line (311) water inlet is linked together, transfusion valve (313) fixed mounting be close to delivery port one end in transfer line (311).

3. The skid-mounted profile control fluid distribution system according to claim 2, wherein: unloading subassembly (33) include unloading pipe (331) and unloading valve (332), unloading pipe (331) fixed mounting is on supporting mechanism (2), and the feed inlet and the material feed bin of unloading pipe (331) are linked together, unloading valve (332) fixed mounting is in be close to on unloading pipe (331) unloading mouth one end.

4. A skid-mounted profile control fluid distribution system according to claim 3, wherein: the balance assembly (32) further comprises two sliding plates (326), the sliding plates (326) are arc-shaped and are fixedly arranged on the bottom plate (321), and the circle center of the arc faces the direction of the balance seat (323); one sliding plate (326) is fixedly arranged on one side of the main bearing bin (324) departing from the auxiliary bearing bin (325), and the other sliding plate (326) is fixedly arranged on one side of the auxiliary bearing bin (325) departing from the main bearing bin (324); the main bearing bin (324) and the auxiliary bearing bin (325) are fixedly provided with sliding blocks (3251) on the side walls close to the sliding plate (326), the sliding plate (326) is provided with a sliding groove (3261), and the sliding blocks (3251) are arranged in the sliding groove (3261) in a sliding mode.

5. The skid-mounted profile control fluid distribution system of claim 4, wherein: the liquid distribution mechanism (3) further comprises a discharging assembly (34), the discharging assembly (34) comprises two discharging pipes (341) and two discharging valves (342), the discharging pipes (341) are respectively and fixedly arranged at the lower ends of the main bearing bin (324) and the auxiliary bearing bin (325), the discharging pipes (341) penetrate through the bottom plate (321), and the lower ends of the discharging pipes are positioned in the stirring cavity of the stirring tank (12); the discharge valve (342) is fixedly arranged at the lower end of the discharge pipe (341).

6. The skid-mounted profile control fluid distribution system of claim 5, wherein: the balance assembly (32) further comprises a trigger assembly (327), the trigger assembly (327) comprises a main pressure switch (3271) and an auxiliary pressure switch (3272), the main pressure switch (3271) is fixedly arranged on the bottom plate (321) and is positioned right below the main bearing bin (324), and the auxiliary pressure switch (3272) is fixedly arranged on the bottom plate (321) and is positioned right below the auxiliary bearing bin (325); the auxiliary pressure switch (3272) is electrically connected with the infusion valve (313) and a discharge valve (342) below, and the main pressure switch (3271) is electrically connected with the discharge valve (332).

7. The skid-mounted profile control fluid distribution system of claim 1, wherein: the supporting mechanism (2) comprises two supporting frames (21), and the supporting frames (21) are fixedly arranged on the base (11); the bottom plate (321) is respectively fixedly connected with the two support frames (21).

8. The skid-mounted profile control fluid distribution system of claim 7, wherein: reinforcing rods (22) are symmetrically arranged at the bottom of the support frame (21), and the reinforcing rods (22) are fixedly connected with the support frame (21) and the bottom plate (321) respectively.

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