CN117306622A - Double-bow spraying device of trailing suction hopper dredger - Google Patents

Abstract

The invention discloses a double-bow spraying device of a trailing suction hopper dredger, and belongs to the technical field of dredgers. The double bow spraying device of the drag suction dredger comprises a bow, wherein a mounting plate is fixedly arranged on the bow, two groups of angle adjusting mechanisms are arranged on the mounting plate, each group of angle adjusting mechanisms is connected with a spraying mechanism, each angle adjusting mechanism comprises a horizontal adjusting component for driving the spraying mechanism to rotate in the horizontal direction and a vertical adjusting component for driving the spraying mechanism to rotate in the vertical direction, the horizontal adjusting component is connected with the vertical adjusting component, and an automatic pressurizing component is arranged on the spraying mechanism; the invention can automatically adjust the bow spraying range of the dredger, improve the operation spraying range, reduce the workload of a crew, and greatly improve the bow spraying and mud throwing quality and efficiency of the trailing suction hopper dredger.

Description

Double-bow spraying device of trailing suction hopper dredger

Technical Field

The invention relates to the technical field of dredgers, in particular to a double-bow spraying device of a trailing suction hopper dredger.

Background

The self-propelled trailing suction hopper dredger has wide application range, and is a main ship in the dredging industry. The self-propelled trailing suction hopper dredger does not need anchoring during dredging operation, so the self-propelled trailing suction hopper dredger has the characteristic of out of the way, is not only used for dredging operation of deepening and maintaining a channel, but also is largely used for large-scale hydraulic reclamation and land building operation. The bow spraying is a process for conveying a large amount of sand to a shoal or a shore by a drag suction dredger, is mainly used for conveying a large amount of sand to a river shore, does not have the condition of laying a water pipeline in the initial stage of a rapid hydraulic reclamation project, is suitable for adopting a bow spraying and filling process, and is used for directly spraying slurry to an operation area through a spray pipe nozzle of a dredger bow. Beach sand filling is usually performed near the coast by using bow jets, and islands can also be built in open waters by using bow jets.

The nozzle angle of the bow jet is usually fixed, so that the jet range is fixed in the operation, the method is not suitable for certain operations requiring a hydraulic filling area, slurry of the bow jet is often accumulated into a mountain, the adjustment of the jet angle and the jet distance by moving a ship is high in cost, and a large operation burden is brought to a shipman due to frequent replacement.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a double-bow spraying device of a trailing suction hopper dredger.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the utility model provides a two bow spouts device of suction hopper dredger, includes the bow, fixed mounting has the mounting panel on the bow, be provided with two sets of angle adjustment mechanism on the mounting panel, every group angle adjustment mechanism is connected with injection mechanism, angle adjustment mechanism is including being used for driving injection mechanism horizontal direction pivoted horizontal adjustment subassembly and being used for driving injection mechanism vertical direction pivoted vertical adjustment subassembly, horizontal adjustment subassembly links to each other with vertical adjustment subassembly, be provided with automatic pressurization subassembly on the injection mechanism.

Preferably, the horizontal adjustment assembly comprises a first rotating rod and a second rotating rod which are arranged on the mounting plate in a rotating mode, a driving motor used for driving the first rotating rod to rotate is fixedly arranged at the bottom of the mounting plate, a first gear is arranged on the first rotating rod, a second gear meshed with the first gear is arranged on the second rotating rod, the horizontal adjustment assembly further comprises a support fixedly arranged on the mounting plate, a rack plate is slidably connected onto the support, a limiting frame is arranged on the outer side of the rack plate, a movable rod connected with the second gear is movably connected into the limiting frame, a driven gear is meshed and connected to one side of the rack plate back of the limiting frame, a third rotating rod connected with the rotation of the mounting plate is connected to the bottom of the driven gear, and the spraying mechanism is arranged on the driven gear.

Preferably, the injection mechanism comprises a movable pipe which is arranged in a telescopic manner, two ends of the movable pipe are respectively connected with a connecting pipe and a spray head, the spray head is connected with the telescopic end of the movable pipe, an ear plate is fixedly arranged on the driven gear, and a rotating shaft is rotationally connected between the ear plate and the movable pipe.

Preferably, the second gear is provided with a plurality of first screw holes, first screw rods are connected in the first screw holes in a threaded manner, and the first screw rods are fixedly connected with the movable rods.

Preferably, the vertical adjustment assembly comprises two support plates fixedly arranged on the mounting plate, a reciprocating screw rod is rotatably connected between the two support plates, a worm wheel is arranged on the reciprocating screw rod, a worm in meshed connection with the worm wheel is arranged on the first rotating rod, a sleeve is connected with the outer side of the reciprocating screw rod in a threaded manner, the sleeve is movably connected with a swinging rod through a pin shaft, the vertical adjustment assembly further comprises a plurality of telescopic rods fixedly arranged on the mounting plate, a rotating rod is movably connected between one end of the swinging rod far away from the sleeve and one telescopic rod, a plurality of telescopic rods are connected with one arc-shaped plate at one end of the telescopic rod far away from the mounting plate, and the arc-shaped plate and the injection mechanism are arranged in a sliding manner.

Preferably, the swing rod comprises two rod bodies, wherein one rod body is rotatably provided with a second screw rod, and the other rod body is provided with a second screw hole matched with the second screw rod.

Preferably, a chute is formed in the arc-shaped plate, a sliding block is connected in the chute in a sliding mode, and the sliding block is fixedly connected with the spray head.

Preferably, the automatic pressurizing assembly comprises a connecting seat connected with the spray head, a sleeve is fixedly arranged on the connecting seat, a piston is connected in a sliding manner in the sleeve, a first elastic element is arranged between the piston and the inner wall of the sleeve, one side, deviating from the first elastic element, of the piston is connected with a connecting rod, and a guide plate sliding at the opening of the spray head is fixedly arranged on the connecting rod.

Preferably, the telescopic rod is fixedly provided with an arc-shaped shell, an air bag is arranged in the arc-shaped shell, the rotating rod is provided with a shifting plate which is movably propped against the air bag, and an air duct is communicated between the air bag and the sleeve.

Preferably, matched threaded holes are formed in the bow and the mounting plate, and bolts are movably connected in the threaded holes.

Compared with the prior art, the invention provides a double bow spraying device of a trailing suction hopper dredger, which has the following beneficial effects:

1. this two bow spouts device of suction hopper dredger drives the injection angle automatic transition of injection mechanism through angle adjustment mechanism, can adjust the bow of hopper dredger and spout the scope automatically, improves the operation injection scope, reduces crewman's work operation burden, can greatly improve the quality and the efficiency that the suction hopper dredger bow spouted mud.

2. This two bow spouts device of suction hopper dredger, when the injection angle of injection mechanism on the perpendicular through vertical adjustment subassembly adjustment, automatic pressurization subassembly can carry out suitable shutoff to the opening of shower nozzle, changes shower nozzle opening size for when the shower nozzle is raised, can reduce the shower nozzle opening, makes from shower nozzle spun silt speed accelerate, avoids rising because of the shower nozzle opening, leads to the spraying distance of shower nozzle to shorten, thereby improves the spraying distance of shower nozzle to silt, guarantees the normal operating of bow spraying work.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of an angle adjusting mechanism according to the present invention;

FIG. 3 is a schematic cross-sectional view of an angle adjusting mechanism according to the present invention;

FIG. 4 is a partially enlarged schematic illustration of the structure of portion A of FIG. 3 in accordance with the present invention;

FIG. 5 is a partially enlarged schematic illustration of the structure of portion B of FIG. 3 in accordance with the present invention;

FIG. 6 is a schematic view of the external structure of a second gear of the present invention;

FIG. 7 is a schematic view of the swing lever of the present invention;

FIG. 8 is a schematic cross-sectional view of a spray head according to the present invention;

fig. 9 is a schematic view of the structure in the housing of the present invention.

In the figure: 1. a bow; 2. a mounting plate; 3. an angle adjusting mechanism; 301. a driving motor; 4. a spraying mechanism; 401. a movable tube; 402. a connecting pipe; 403. a spray head; 5. a first rotating lever; 501. a first gear; 502. a worm; 6. a second rotating rod; 601. a second gear; 6011. a first screw hole; 602. a movable rod; 6021. a first screw; 7. a support; 701. rack plate; 702. a limit frame; 8. a third rotating rod; 801. a driven gear; 8011. ear plates; 8012. a rotating shaft; 9. a support plate; 901. a reciprocating screw rod; 9011. a worm wheel; 902. a sleeve; 903. a swinging rod; 9031. a rod body; 9032. a second screw; 9033. a second screw hole; 10. a telescopic rod; 11. an arc-shaped plate; 111. a chute; 112. a slide block; 12. a connecting seat; 121. a sleeve; 122. a piston; 123. a first elastic element; 124. a connecting rod; 125. a deflector; 13. an arc-shaped housing; 131. an air bag; 132. an air duct; 14. a rotating lever; 141. a poking plate; 15. a threaded hole; 151. and (5) a bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.

In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two elements; the specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Examples:

referring to fig. 1, 2 and 3, a double bow spraying device of a drag suction dredger comprises a bow 1, wherein a mounting plate 2 is fixedly arranged on the bow 1, two groups of angle adjusting mechanisms 3 are arranged on the mounting plate 2, each group of angle adjusting mechanisms 3 is connected with a spraying mechanism 4, each angle adjusting mechanism 3 comprises a horizontal adjusting component for driving the spraying mechanism 4 to rotate in the horizontal direction and a vertical adjusting component for driving the spraying mechanism 4 to rotate in the vertical direction, the horizontal adjusting component is connected with the vertical adjusting component, and an automatic pressurizing component is arranged on the spraying mechanism 4.

Specifically, design traditional single bow and spout the mechanism into two bow and spout the mechanism, improve dredger's bow and spout efficiency, drive the injection angle automatic transition of injection mechanism 4 through angle adjustment mechanism 3, can adjust dredger's bow and spout the scope voluntarily, make injection mechanism 4 lift from top to bottom in the in-process of reciprocal wobbling, improve the operation injection scope, reduce crewman's work operation burden, can greatly improve the quality and the efficiency that dredger bow spouted the mud of trailing suction hopper.

Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 6, as a preferred technical scheme of the present invention, the horizontal adjustment assembly includes a first rotating rod 5 and a second rotating rod 6 rotatably disposed on a mounting plate 2, a driving motor 301 for driving the first rotating rod 5 to rotate is fixedly disposed at the bottom of the mounting plate 2, a first gear 501 is disposed on the first rotating rod 5, a second gear 601 engaged and connected with the first gear 501 is disposed on the second rotating rod 6, the horizontal adjustment assembly further includes a support 7 fixedly disposed on the mounting plate 2, a rack plate 701 is slidingly connected on the support 7, a limit frame 702 is disposed outside the rack plate 701, a movable rod 602 connected with the second gear 601 is movably connected in the limit frame 702, a driven gear 801 is engaged and connected at one side of the rack plate 701 facing away from the limit frame 702, a third rotating rod 8 rotatably connected with the mounting plate 2 is connected at the bottom of the driven gear 801, and the spraying mechanism 4 is disposed on the driven gear 801.

Specifically, the driving motor 301 is controlled to operate, so that the output end of the driving motor 301 drives the first rotating rod 5 to rotate, the first gear 501 on the outer side is meshed with the second gear 601 on the second rotating rod 6 to drive the second rotating rod 6 to rotate, the movable rod 602 is driven to reciprocate in the rotating process of the movable rod 602, the limiting frame 702 is driven to reciprocate, the limiting frame 702 is driven to drive the rack plate 701 to move and is meshed with the driven gear 801 to drive the driven gear 801 to rotate, the driven gear 801 drives the third rotating rod 8 to rotate, and the third rotating rod 8 is driven to drive the injection mechanism 4 to reciprocate left and right to swing, so that the injection range of the injection mechanism 4 is improved, slurry is uniformly distributed in a designated area, and the bow injection effect is improved.

Referring to fig. 1, 2 and 3, as a preferred technical solution of the present invention, the injection mechanism 4 includes a movable tube 401 that is telescopically arranged, two ends of the movable tube 401 are respectively connected with a connection tube 402 and a spray head 403, the spray head 403 is connected with the telescopic end of the movable tube 401, an ear plate 8011 is fixedly arranged on the driven gear 801, and a rotating shaft 8012 is rotatably connected between the ear plate 8011 and the movable tube 401.

Specifically, the injection mechanism 4 is connected to a mud discharge line of the dredger through a connection pipe 402, and mud in the mud tank sequentially enters the connection pipe 402, the movable pipe 401 and is injected out through a nozzle 403 through the mud discharge line, and the movable pipe 401 rotates on the driven gear 801 through a rotation shaft 8012.

Referring to fig. 6, as a preferred embodiment of the present invention, a plurality of first screw holes 6011 are formed in the second gear 601, and a first screw 6021 is connected to the first screw holes 6011 by internal threads, and the first screw 6021 is fixedly connected to the movable rod 602.

Specifically, the movable rod 602 may be installed in different first screw holes 6011 on the second gear 601 through the first screw rod 6021, so as to adjust the distance between the movable rod 602 and the central axis of the second gear 601, and adjust the moving range of the limiting frame 702, thereby adjusting the left-right rotation amplitude of the injection mechanism 4, and the staff may adjust the position of the movable rod 602 according to the actual bow injection range.

Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, as a preferred technical scheme of the present invention, the vertical adjustment assembly includes two support plates 9 fixedly arranged on the mounting plate 2, a reciprocating screw rod 901 is rotatably connected between the two support plates 9, a worm gear 9011 is arranged on the reciprocating screw rod 901, a worm 502 engaged with the worm gear 9011 is arranged on the first rotating rod 5, a sleeve 902 is in threaded connection with the outer side of the reciprocating screw rod 901, the sleeve 902 is movably connected with a swinging rod 903 through a pin shaft, the vertical adjustment assembly further includes a plurality of telescopic rods 10 fixedly arranged on the mounting plate 2, a rotating rod 14 is movably connected between one end of the swinging rod 903 far away from the sleeve 902 and one of the telescopic rods 10, one end of the telescopic rods 10 far away from the mounting plate 2 is connected with the same arc plate 11, and the arc plate 11 is slidably arranged with the injection mechanism 4.

Further, a sliding groove 111 is formed on the arc plate 11, a sliding block 112 is connected in a sliding manner in the sliding groove 111, and the sliding block 112 is fixedly connected with the spray head 403.

Specifically, when the driving motor 301 drives the first rotating rod 5 to rotate, the worm 502 on the first rotating rod 5 is meshed with the worm gear 9011 on the reciprocating screw rod 901, the worm gear 9011 drives the reciprocating screw rod 901 to rotate between the two support plates 9, the sleeve 902 on the outer side moves reciprocally along the axial direction when the reciprocating screw rod 901 rotates, when the sleeve 902 moves away from the worm gear 9011, the sleeve 902 pushes the telescopic rod 10 upwards through the swinging rod 903 to stretch, the telescopic rod 10 drives the arc plate 11 to move upwards, the arc plate 11 drives the spray head 403 to move upwards through the sliding block 112, and when the spray head 403 moves upwards along with the arc plate 11, the movable pipe 401 is driven to rotate around the rotating shaft 8012, the movable pipe 401 is stretched in the process, and then the spray angle of the spray head 403 is lifted, so that the operation spray range is improved; when the horizontal adjusting component drives the spraying mechanism 4 to rotate, the spray head 403 drives the slider 112 to slide in the chute 111, and the slider 112 can be configured into a dovetail shape, so as to avoid the slider 112 from sliding out of the chute 111.

Referring to fig. 7, as a preferred embodiment of the present invention, the swing rod 903 is composed of two rod bodies 9031, wherein a second screw 9032 is rotatably disposed on one rod body 9031, and a second screw hole 9033 matched with the second screw 9032 is formed on the other rod body 9031.

Specifically, by rotating the second screw 9032, the distance between the two rod bodies 9031 is adjusted, and thus the length of the swing rod 903 is changed, the elevation angle of the head 403 is adjusted, and thus the ejection distance is adjusted.

Referring to fig. 1, 2, 3, 4, 5, 8 and 9, as a preferred technical solution of the present invention, the automatic pressurizing assembly includes a connection seat 12 connected with a spray head 403, a sleeve 121 is fixedly arranged on the connection seat 12, a piston 122 is slidably connected in the sleeve 121, a first elastic element 123 is arranged between the piston 122 and an inner wall of the sleeve 121, one side of the piston 122 facing away from the first elastic element 123 is connected with a connecting rod 124, and a deflector 125 sliding at an opening of the spray head 403 is fixedly arranged on the connecting rod 124.

Further, an arc-shaped housing 13 is fixedly arranged on the telescopic rod 10, an air bag 131 is arranged in the arc-shaped housing 13, a shifting plate 141 which is movably propped against the air bag 131 is arranged on the rotating rod 14, and an air duct 132 is communicated between the air bag 131 and the sleeve 121.

Specifically, when the vertical adjustment assembly adjusts the injection angle of the injection mechanism 4 on the vertical plane, the swinging rod 903 drives the shifting plate 141 to rotate through the rotating rod 14, the shifting plate 141 extrudes the air bag 131 in the arc-shaped shell 13, air in the air bag 131 is led into the sleeve 121 through the air duct 132, the piston 122 is forced to move upwards and drives the air guide plate 125 to slide towards the nozzle 403 through the connecting rod 124, the opening of the nozzle 403 can be properly blocked, the size of the opening of the nozzle 403 is changed, when the nozzle 403 is lifted, the opening of the nozzle 403 can be reduced, the sediment speed sprayed from the nozzle 403 is accelerated, the spraying straight-line spraying distance of the nozzle 403 is shortened due to the lifting of the opening of the nozzle 403, and therefore, the spraying distance of the nozzle 403 to sediment is improved, and the normal operation of the bow spraying work is ensured.

Referring to fig. 1, as a preferred embodiment of the present invention, screw holes 15 are formed in the bow 1 and the mounting plate 2, and bolts 151 are movably connected to the screw holes 15.

Specifically, the bow 1 and the mounting plate 2 are connected through the bolts 151, so that the device can be quickly disassembled and assembled, and the working efficiency is improved.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (10)

1. The utility model provides a two bow spouts device of suction hopper dredger, includes bow (1), its characterized in that, fixedly mounted mounting panel (2) on bow (1), be provided with two sets of angle adjustment mechanism (3) on mounting panel (2), every group angle adjustment mechanism (3) are connected with injection mechanism (4), angle adjustment mechanism (3) are including being used for driving injection mechanism (4) horizontal direction pivoted horizontal adjustment subassembly and being used for driving injection mechanism (4) vertical direction pivoted vertical adjustment subassembly, horizontal adjustment subassembly links to each other with vertical adjustment subassembly, be provided with automatic pressurization subassembly on injection mechanism (4).

2. The double bow spraying device of the drag suction dredger according to claim 1, characterized in that the horizontal adjusting component comprises a first rotating rod (5) and a second rotating rod (6) which are rotatably arranged on a mounting plate (2), a driving motor (301) used for driving the first rotating rod (5) to rotate is fixedly arranged at the bottom of the mounting plate (2), a first gear (501) is arranged on the first rotating rod (5), a second gear (601) meshed with the first gear (501) is arranged on the second rotating rod (6), a support (7) fixedly arranged on the mounting plate (2) is further arranged on the horizontal adjusting component, a rack plate (701) is connected to the support (7) in a sliding mode, a limiting frame (701) is arranged on the outer side of the rack plate (701), a movable rod (602) connected with the second gear (601) is movably connected to the bottom of the limiting frame (702), a driven gear (801) is connected to one side of the driven gear (801) in a meshed mode, and a third rotating mechanism (801) connected with the rack plate (2) is arranged on the driven gear (801).

3. The double-bow spraying device of the trailing suction hopper dredger according to claim 2, wherein the spraying mechanism (4) comprises a movable pipe (401) which is arranged in a telescopic manner, two ends of the movable pipe (401) are respectively connected with a connecting pipe (402) and a spray head (403), the spray head (403) is connected with the telescopic end of the movable pipe (401), an ear plate (8011) is fixedly arranged on the driven gear (801), and a rotating shaft (8012) is rotatably connected between the ear plate (8011) and the movable pipe (401).

4. The double bow spraying device of the trailing suction hopper dredger according to claim 2, wherein a plurality of first screw holes (6011) are formed in the second gear (601), the first screw holes (6011) are internally connected with first screws (6021) in a threaded mode, and the first screws (6021) are fixedly connected with the movable rods (602).

5. A double bow spraying device of a drag suction dredger according to claim 3, characterized in that, the vertical adjustment assembly is including setting firmly two extension boards (9) on mounting panel (2), two rotate between extension boards (9) and be connected with reciprocating screw (901), be provided with worm wheel (9011) on reciprocating screw (901), be provided with worm (502) with worm wheel (9011) meshing connection on first bull stick (5), reciprocating screw (901) outside threaded connection has sleeve (902), sleeve (902) have swinging arms (903) through round pin axle swing joint, vertical adjustment assembly is still including setting firmly a plurality of telescopic links (10) on mounting panel (2), swing link (903) are kept away from between one end of sleeve (902) and one of them telescopic link (10) swing link (14), a plurality of one end that telescopic link (10) kept away from mounting panel (2) is connected with same arc (11), arc (11) and injection mechanism (4) slip setting.

6. The double bow spraying device of the trailing suction hopper dredger according to claim 5, wherein the swinging rod (903) is composed of two rod bodies (9031), wherein a second screw (9032) is rotatably arranged on one rod body (9031), and a second screw hole (9033) matched with the second screw (9032) is formed on the other rod body (9031).

7. The double bow spraying device of the trailing suction hopper dredger according to claim 5, wherein a chute (111) is formed in the arc-shaped plate (11), a sliding block (112) is connected in a sliding manner in the chute (111), and the sliding block (112) is fixedly connected with a spray head (403).

8. The double bow spraying device of the drag suction dredger according to claim 7, wherein the automatic pressurizing assembly comprises a connecting seat (12) connected with a spray head (403), a sleeve (121) is fixedly arranged on the connecting seat (12), a piston (122) is slidably connected to the sleeve (121), a first elastic element (123) is arranged between the piston (122) and the inner wall of the sleeve (121), a connecting rod (124) is connected to one side, deviating from the first elastic element (123), of the piston (122), and a guide plate (125) sliding at an opening of the spray head (403) is fixedly arranged on the connecting rod (124).

9. The double-bow spraying device of the drag suction dredger according to claim 8, wherein an arc-shaped shell (13) is fixedly arranged on the telescopic rod (10), an air bag (131) is arranged in the arc-shaped shell (13), a shifting plate (141) which is movably abutted against the air bag (131) is arranged on the rotating rod (14), and an air duct (132) is communicated between the air bag (131) and the sleeve (121).

10. The double bow spraying device of the trailing suction hopper dredger according to claim 1 is characterized in that matched threaded holes (15) are formed in the bow (1) and the mounting plate (2), and bolts (151) are movably connected in the threaded holes (15).