Butt joint device for pipe orifices of water supply and drainage pipelines

Abstract

The invention relates to a water supply and drainage pipeline orifice butt joint device, and belongs to the technical field of drainage pipelines, the water supply and drainage pipeline orifice butt joint device comprises a butt joint support, the butt joint support comprises a bottom frame and a vertical frame, the bottom frame is horizontally arranged, and a first bearing piece and a second bearing piece are slidably connected to the bottom frame; the first bearing piece and the second bearing piece can move in the direction close to each other or away from each other relative to the bottom frame, a sliding rod is horizontally fixed to the vertical frame, a fastening piece is slidably connected to the sliding rod, the fastening piece can be connected with the first bearing piece and the second bearing piece in an inserted and embedded mode, and the pipe orifice butt joint device has the effect of simply and rapidly achieving pipe orifice butt joint.

Description

Technical Field

[0001] The present application relates to the technical field of water supply and drainage pipes, and in particular to a pipe orifice docking device for water supply and drainage pipes. Background Art

[0002] At present, water supply and drainage pipelines play a vital role in the construction of modern urban infrastructure. Ensuring the efficient operation of water supply and sewage discharge systems is one of the important goals of urban construction. With the acceleration of urbanization, the demand for installation and maintenance of water supply and drainage pipelines is increasing. Especially in large-scale construction sites and municipal projects, the rapid and precise docking of pipelines has become a key link in improving construction efficiency. Traditional pipeline docking methods mainly rely on manual operation, which has problems such as low docking accuracy, high labor intensity, and long construction time, which seriously affects the progress and quality of the project. Therefore, it is of great practical significance to develop a device that can achieve rapid and precise docking of pipelines.

[0003] At present, in the field of water supply and drainage pipe docking, the commonly used solutions mainly include manual docking tools and simple positioning devices. Manual docking tools are usually used by workers to dock pipes using tools such as wrenches and screwdrivers, and to determine whether the pipes are aligned through visual inspection and experience. Simple positioning devices are to install positioning rings or rulers on both ends of the pipes, and use these auxiliary tools to help workers perform preliminary alignment. Although these methods can meet basic docking needs to a certain extent, there are still many shortcomings in practical applications.

[0004] Existing manual docking tools and simple positioning devices have significant defects in actual operation. First, manual docking tools completely rely on the experience and skills of workers, and the docking accuracy is difficult to guarantee. Dislocation is prone to occur, leading to problems such as leakage or seepage. Secondly, although the simple positioning device can improve the docking accuracy to a certain extent, due to its simple structure, it cannot adapt to complex construction environments, especially in small spaces or uneven ground. The effect of the positioning device will be greatly reduced. In addition, these traditional methods have low construction efficiency, consume a lot of manpower and material resources, and increase construction costs. Therefore, there is an urgent need for a new device that can effectively improve the accuracy and construction efficiency of pipeline docking. Summary of the invention

[0005] In order to solve the above-mentioned problems, the present application provides a drainage pipe outlet docking device.

[0006] The water supply and drainage pipe orifice docking device provided in this application adopts the following technical solution: The pipe orifice docking device of water supply and drainage pipe comprises a docking bracket, which comprises a base frame and a vertical frame. The base frame is horizontally arranged, and a universal wheel is arranged at the bottom of the base frame. The vertical frame is vertically arranged, and the vertical frame is fixedly connected to the base frame. A sliding rod is horizontally fixed on the vertical frame. A first supporting member and a second supporting member are slidably connected to the base frame. The first supporting member and the second supporting member slide in a direction approaching or moving away from each other. A limiting rod for fixing the first supporting member is arranged on the sliding rod, and a driving assembly for driving the second supporting member to slide is arranged on the base frame. A fastener is arranged on the sliding rod, and a slider is arranged on the fastener. The slider ring is sleeved on the sliding rod and slides along the length direction of the sliding rod. The fastener rotates relative to the slider, and the direction of the rotation axis of the fastener is parallel to the direction of the sliding rod. The fastener is provided with a plug rod for connecting with the first supporting member and the second supporting member.

[0007] By adopting the above technical solution, the docking bracket is pushed to the position where the pipes need to be docked, and a flatter place is selected as much as possible, or the weeds and garbage on the ground are shoveled flat, so as to improve the efficiency of the pipe orifice docking. The base frame is placed horizontally, and the first supporting member is first slid to a suitable position and fixed, and the initial pipe is placed on the first supporting member, and then the docking pipe is placed on the second supporting member. By sliding the second supporting member, it is gradually approached to the first supporting member, and the docking pipe and the initial pipe orifice are gradually docked. After the position is adjusted to a suitable position, a hot melt device is used to perform hot melt welding on the pipe orifice docking position, and then the fasteners are fixed to the first supporting member and the second supporting member, thereby increasing the stability of the pipe orifice docking.

[0008] Optionally, the driving assembly includes a threaded rod, a threaded block and a driving motor, the driving motor is fixed on the base frame, the driving motor is fixed to the threaded rod, the threaded rod is horizontally arranged and rotates relative to the base frame, the threaded block is fixed to the second supporting member, the threaded block is threadedly connected to the threaded rod, a second sliding sleeve is fixed on the second supporting member, and the second sliding sleeve ring slides on the sliding rod.

[0009] By adopting the above technical solution, the driving motor is started to drive the threaded rod to rotate. The threaded rod moves with the threaded block, and the second sliding sleeve on the second supporting member slides and guides on the sliding rod. Therefore, the threaded block can slide back and forth along the length direction of the threaded rod, thereby realizing the sliding of the second supporting member towards or away from the first supporting member.

[0010] Optionally, a rotary rod is threadedly connected to the second sliding sleeve, a locking block is provided inside the second sliding sleeve, and the rotary rod passes through the side wall of the second sliding sleeve and is rotatably connected to the locking block.

[0011] By adopting the above technical solution, after the second supporting member is adjusted to a suitable position, the rotating rod on the second sliding sleeve is rotated. While the rotating rod is threadedly connected to the second sliding sleeve, it drives the clamping block to clamp in the direction of the sliding rod, thereby fixing the second supporting member and the sliding rod, thereby increasing the stability of the second supporting member.

[0012] Optionally, a sliding assembly is provided on the first supporting member, and the sliding assembly includes a rack, a driving tooth and a rotating rod. The rack is fixed to the bottom of the first supporting member, and the rack itself is arranged in a direction parallel to the sliding rod. The rotating rod is fixed to the driving tooth, and the driving tooth is meshed with the rack. The rotating rod rotates relative to the base frame, and the rotation axis direction of the rotating rod is in a direction perpendicular to the length of the sliding rod.

[0013] By adopting the above technical solution, when the first supporting member is adjusted in position, the rotating rod rotates, and the rotating rod drives the driving teeth to rotate, and the driving teeth mesh with the rack. Since the rotation axis direction of the rotating rod is perpendicular to the direction of the sliding rod, it can drive the rack and the first supporting member to reciprocate along the length direction of the sliding rod.

[0014] Optionally, a first motor is fixed on the base frame, a driving tooth is fixed on the first motor, a driven tooth is fixed on the rotating rod, the driven tooth is meshed with the driving tooth, and a diameter of the driven tooth is greater than a diameter of the driving tooth.

[0015] By adopting the above technical solution, the first motor starts, driving the active gear to rotate, and the active gear engages with the driven gear. Since the diameter of the driven gear is larger than that of the active gear, it can achieve the purpose of deceleration and buffering, so that the adjustment movement of the first supporting member can be smoother and more stable.

[0016] Optionally, a first sliding sleeve is fixed on the first supporting member, and the first sliding sleeve ring slides on the sliding rod. The sliding rod is provided with a plurality of limiting grooves, and the plurality of limiting grooves are arranged at intervals along the length direction of the sliding rod. The limiting rod passes through the first sliding sleeve and the limiting grooves for limiting.

[0017] By adopting the above technical solution, when the limiting rod moves and limits in the multiple limiting grooves, not only can the first supporting member be adjusted to a suitable position, but also the stability of the first supporting member can be increased.

[0018] Optionally, a pin seat is fixed on the first supporting member, and a latch is fixed on the second supporting member. When the first supporting member and the second supporting member are close to each other, the latch and the pin seat are inserted and connected, and both the latch and the pin seat are provided with through holes for the insertion rod to pass through.

[0019] By adopting the above technical solution, the first supporting member is first fixed to a suitable position, the initial pipeline is placed on the first supporting member, and then the docking pipeline is placed on the second supporting member. The second supporting member is moved so that the docking pipeline docks with the pipe mouth of the initial pipeline. At this time, when the second supporting member and the first supporting member are close to each other, the latch and the pin seat are inserted and connected, which can preliminarily determine whether the first supporting member and the second supporting member are aligned, and then the stability of the initial pipeline and the docking pipeline can be increased.

[0020] Optionally, a plurality of spring rods are arranged on the second supporting member, and the plurality of spring rods are arranged at intervals along the radial direction of the second supporting member.

[0021] By adopting the above technical solution, the multiple spring rods can play a buffering role when the docking pipe is placed on the second supporting member, so as to better protect the second supporting member and the docking pipe.

[0022] Optionally, a connecting rod is provided between adjacent spring rods, and a plurality of rollers are rotatably connected to the connecting rod. The plurality of rollers are arranged to fit the curvature of the second supporting member, and the rotation axis directions of the plurality of rollers are all perpendicular to the movement direction of the second supporting member.

[0023] By adopting the above technical solution, when the docking pipe is placed on the second supporting member, the multiple rollers can reduce the friction between the docking pipe and the second supporting member, so that the movement of the docking pipe is more flexible and smooth.

[0024] Optionally, a cylinder is fixed on one side of the base frame close to the second supporting member, the cylinder is vertically arranged, and the movable end of the cylinder is rotatably connected to a sub-supporting member, the sub-supporting member itself is provided with an arc, and the arc faces one side of the pipeline.

[0025] By adopting the above technical solution, due to the different lengths of the docking pipes, when encountering a longer pipe, when the docking pipe and the initial pipe mouth are docked, the docking pipe will be easily affected by its own length and weight, and the center will deviate. The auxiliary support can assist in supporting the docking pipe, thereby reducing the influence of the docking pipe's own gravity on the pipe docking, thereby improving the accuracy of the pipe mouth docking.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. After pushing the docking bracket to the designated position, try to make the ground flat, first place the initial pipe on the first supporting member, then drive the first supporting member to move relative to the base frame through the sliding assembly, and finally fix the first supporting member with the limit rod to increase the stability of the first supporting member; 2. After the initial pipe is placed on the first supporting member, place the docking pipe on the second supporting member. The spring rod on the second supporting member can buffer the docking pipe, and the roller can make the docking pipe more flexible and smooth when placed. Then the driving assembly drives the second supporting member to move towards the first supporting member, and the rotating rod can fix the second supporting member and the sliding rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A; Figure 3 yes Figure 1 A partial enlarged schematic diagram of part B; Figure 4 This is a schematic diagram showing the cross-sectional structure of the second supporting member.

[0028] In the figure, 1, docking bracket; 11, base frame; 111, universal wheel; 12, vertical frame; 121, sliding rod; 1211, limiting groove; 2, first supporting member; 21, first sliding sleeve; 211, limiting rod; 22, pin seat; 3, second supporting member; 31, second sliding sleeve; 311, rotating rod; 312, tightening block; 32, latch; 4, fastener; 41, slider; 42, inserting rod; 5, driving assembly; 51, threaded rod; 52, threaded block; 53, driving motor; 6, sliding assembly; 61, rack; 62, driving gear; 63, rotating rod; 64, first motor; 65, driving gear; 66, driven gear; 7, spring rod; 71, connecting rod; 72, roller; 8, cylinder; 81, auxiliary supporting member. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-Figure 4 This application is described in further detail.

[0030] The embodiment of the present application discloses a pipe orifice docking device for water supply and drainage pipes.

[0031] refer to Figure 1 The pipe orifice docking device of the water supply and drainage pipe includes a docking bracket 1, which includes a base frame 11 and a vertical frame 12. A universal wheel 111 is arranged at the bottom of the base frame 11, and the vertical frame 12 is vertically fixed to the base frame 11. When the docking bracket 1 is pushed to the position where the pipe needs to be docked, a position with a relatively flat ground is first selected, and then the base frame 11 is set horizontally as much as possible. At this time, the vertical frame 12 is set vertically, and a sliding rod 121 is horizontally fixed on the vertical frame 12. An arc-shaped first supporting member 2 and a second supporting member 3 are arranged on the base frame 11. The first supporting member 2 and the second supporting member 3 slide in a direction close to or away from each other. A fastener 4 is arranged on the sliding rod 121, and the fastener 4 is also arranged with an arc. The arc of the first supporting member 2 and the second supporting member 3 is circular with the arc cross section of the fastener 4, and matches the pipe diameter.

[0032] refer to Figure 1 and Figure 2, the first supporting member 2 and the second supporting member 3 move relative to the base frame 11 in a direction of approaching or moving away from each other, a pin seat 22 is fixed on the side of the first supporting member 2 close to the second supporting member 3, and a latch 32 is fixed on the side of the second supporting member 3 close to the first supporting member 2. When the first supporting member 2 and the second supporting member 3 are close to each other, the latch 32 and the pin seat 22 are plugged and connected, and both the latch 32 and the pin seat 22 are vertically provided with perforations; a slider 41 is provided on the fastener 4, and the slider 41 is sleeved on the slide rod 121 to slide, and the fastener 4 is hinged to the slider 41, and an insertion rod 42 is fixed on the end of the fastener 4 away from the slider 41, and the insertion rod 42 is respectively plugged and connected with the perforations on the first supporting member 2 and the second supporting member 3, and the latch 32 and the pin seat 22 are plugged, which can not only detect whether the first supporting member 2 and the second supporting member 3 are aligned when moving, but also can be plugged and fixed with the fastener 4 after the initial pipeline and the docking pipeline are docked, so as to increase the firmness of the pipeline docking interface.

[0033] refer to Figure 1 A sliding assembly 6 is provided at the bottom of the first supporting member 2, and the sliding assembly 6 includes a rack 61, a driving tooth 62 and a rotating rod 63. Two racks 61 and two driving teeth 62 are respectively provided, and both are axially symmetrically arranged along the center line of the first supporting member 2. The rack 61 is fixed to the bottom of the first supporting member 2, and the rack 61 itself is arranged in a direction parallel to the sliding rod 121. The rotating rod 63 is horizontally arranged on the bottom frame 11 in a direction perpendicular to the sliding rod 121. The rotating rod 63 penetrates the driving tooth 62 and is coaxially fixed with the driving tooth 62. The driving tooth 62 is meshed with the rack 61; the bottom frame 11 is horizontally fixed There is a first motor 64, a driving tooth 65 is fixed on the motor shaft of the first motor 64, a driven tooth 66 is fixed on the rotating rod 63, the diameter of the driven tooth 66 is larger than the diameter of the driving tooth 65, the driven tooth 66 meshes with the driving tooth 65, the first motor 64 is started, driving the driving tooth 65 to rotate, the driving tooth 65 meshes with the driven tooth 66, and can drive the rotating rod 63 to rotate, so that the two driving teeth 62 rotate, and when the driving tooth 62 rotates, it meshes with the rack 61, that is, it can drive the first supporting member 2 to slide relative to the base frame 11, and the driven tooth 66 at this time can play a role of deceleration and buffering.

[0034] A first sleeve 21 is fixed on the first supporting member 2. The first sleeve 21 is sleeved on the slide rod 121 and slides thereon. A plurality of limit grooves 1211 are provided on the slide rod 121. The plurality of limit grooves 1211 are spaced apart along the length direction of the slide rod 121. An insertion hole is provided on the first sleeve 21. A T-shaped limit rod 211 is also provided on the first sleeve 21. The limit rod 211 passes through the insertion hole and the limit groove 1211 for limiting, thereby fixing the first supporting member 2 and stabilizing it.

[0035] refer to Figure 3 and Figure 4A driving assembly 5 is provided at the bottom of the second supporting member 3, and the driving assembly 5 includes a threaded rod 51, a threaded block 52 and a driving motor 53. The driving motor 53 is horizontally fixed on the base frame 11, and the motor shaft of the driving motor 53 is fixed to the threaded rod 51. The threaded rod 51 is horizontally arranged in a direction parallel to the sliding rod 121. The threaded rod 51 rotates relative to the base frame 11, and the threaded block 52 is fixed to the bottom of the second supporting member 3, and the threaded block 52 is threadedly connected to the threaded rod 51.

[0036] A second sleeve 31 is fixed on the second supporting member 3, and the second sleeve 31 is sleeved on the slide rod 121 and slides thereon. A T-shaped rotating rod 311 is threadedly connected to the second sleeve 31, and an arc-shaped clamping block 312 is arranged inside the second sleeve 31. The rotating rod 311 penetrates through the side wall of the second sleeve 31 and is rotatably connected to the clamping block. The driving motor 53 is started to drive the threaded rod 51 to rotate, and the threaded rod 51 and the threaded block 52 are threadedly moved. Under the guiding and limiting action of the movement of the second sleeve 31 sleeved on the slide rod 121, the second supporting member 3 moves in the direction approaching or away from the first supporting member 2. After the second supporting member 3 is stable, the rotating rod 311 is tightened to make the clamping block 312 and the slide rod 121 press tightly, so that the second supporting member 3 can be fixed.

[0037] refer to Figure 4 A plurality of grooves are provided on the second supporting member 3, and a plurality of spring rods 7 are arranged in the grooves. The plurality of spring rods 7 are arranged at intervals along the radial direction of the second supporting member 3, and a connecting rod 71 is provided between adjacent spring rods 7. A plurality of rollers 72 are rotatably connected to the connecting rod 71. The connecting rod 71 and the roller 72 are both provided with an arc that fits the second supporting member 3 itself. The rotation axis direction of the plurality of rollers 72 is perpendicular to the movement direction of the second supporting member 3. When the docking pipe is placed on the second supporting member 3, the spring rod 7 can provide a buffer to better protect the docking pipe and the second supporting member 3. Then the docking pipe moves on the roller 72, which can increase the flexibility and smoothness of the movement of the docking pipe.

[0038] refer to Figure 1 A cylinder 8 is fixed on one side of the base frame 11 close to the second supporting member 3. The cylinder 8 is vertically arranged. A bearing is arranged at the movable end of the cylinder 8. The bearing is rotatably connected to a sub-supporting member 81. The sub-supporting member 81 itself is provided with an arc, and the arc is consistent with the arc of the second supporting member 3. When the docking pipe is too long, the center of gravity of the docking pipe will deviate due to its own gravity. At this time, the sub-supporting member 81 can play an auxiliary supporting role, thereby increasing the accuracy of the pipe orifice docking.

[0039] The implementation principle of the water supply and drainage pipe orifice docking device of the embodiment of the present application is: first push the docking bracket 1 to the specified position, then try to ensure that the ground is flat so that the base frame 11 is horizontal, first place the initial pipe on the first supporting member 2, adjust the appropriate position, and then fix it, then place the docking pipe on the second supporting member 3, adjust the position of the docking pipe, and then drive the second supporting member 3 to be inserted and fixed with the first supporting member 2, after completing the docking of the pipe orifices, fix it with fasteners 4 to ensure the stability of the pipe orifice docking.

[0040] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipe joint device for water supply and drainage pipes, characterized in that: The invention comprises a docking bracket (1), wherein the docking bracket (1) comprises a bottom frame (11) and a vertical frame (12), wherein the bottom frame (11) is arranged horizontally, and a universal wheel (111) is arranged at the bottom of the bottom frame (11), and the vertical frame (12) is arranged vertically, and the vertical frame (12) is fixedly connected to the bottom frame (11), and a sliding rod (121) is horizontally fixed on the vertical frame (12), and a first supporting member (2) and a second supporting member (3) are slidably connected to the bottom frame (11), and the first supporting member (2) and the second supporting member (3) slide in a direction of approaching or moving away from each other, and a sliding rod (121) is arranged on the sliding rod for moving the first supporting member (2) and the second supporting member (3) toward each other. ) is fixed with a limit rod (211), a driving assembly (5) for driving the second supporting member (3) to slide is arranged on the base frame (11), a fastener (4) is arranged on the slide bar (121), a slider (41) is arranged on the fastener (4), the slider (41) is sleeved on the slide bar (121) and slides along the length direction of the slide bar (121), the fastener (4) rotates relative to the slider (41), the rotation axis direction of the fastener (4) is parallel to the direction of the slide bar (121), and the fastener (4) is provided with an insertion rod (42) for connecting with the first supporting member (2) and the second supporting member (3).

2. The water supply and drainage pipe orifice docking device according to claim 1, characterized in that: The driving assembly (5) comprises a threaded rod (51), a threaded block (52) and a driving motor (53); the driving motor (53) is fixed on the base frame (11); the driving motor (53) is fixed to the threaded rod (51); the threaded rod (51) is arranged horizontally and rotates relative to the base frame (11); the threaded block (52) is fixed to the second supporting member (3); the threaded block (52) and the threaded rod (51) are threadedly connected; a second sliding sleeve (31) is fixed on the second supporting member (3); the second sliding sleeve (31) is sleeved on the sliding rod (121) and slides.

3. The water supply and drainage pipe orifice docking device according to claim 2, characterized in that: The second sliding sleeve (31) is threadedly connected with a rotary rod (311), abutment block (312) is arranged inside the second sliding sleeve (31), and the rotary rod (311) passes through the side wall of the second sliding sleeve (31) and is rotatably connected with the abutment block.

4. The water supply and drainage pipe orifice docking device according to claim 1, characterized in that: A sliding assembly (6) is arranged on the first supporting member (2), and the sliding assembly (6) comprises a rack (61), a driving tooth (62) and a rotating rod (63); the rack (61) is fixed to the bottom of the first supporting member (2), and the rack (61) itself is arranged in a direction parallel to the sliding rod (121); the rotating rod (63) is fixed to the driving tooth (62), the driving tooth (62) is meshed with the rack (61), the rotating rod (63) rotates relative to the base frame (11), and the rotation axis direction of the rotating rod (63) is in a direction perpendicular to the length of the sliding rod (121).

5. The water supply and drainage pipe orifice docking device according to claim 4, characterized in that: A first motor (64) is fixed on the base frame (11), a driving tooth (65) is fixed on the first motor (64), a driven tooth (66) is fixed on the rotating rod (63), the driven tooth (66) is meshed with the driving tooth (65), and the diameter of the driven tooth (66) is greater than the diameter of the driving tooth (65).

6. The water supply and drainage pipe orifice docking device according to claim 5, characterized in that: A first sliding sleeve (21) is fixed on the first supporting member (2), and the first sliding sleeve (21) is sleeved on the sliding rod (121) to slide. The sliding rod (121) is provided with a plurality of limiting grooves (1211), and the plurality of limiting grooves (1211) are arranged at intervals along the length direction of the sliding rod (121), and the limiting rod (211) passes through the first sliding sleeve (21) and the limiting grooves (1211) for limiting.

7. The water supply and drainage pipe orifice docking device according to claim 1, characterized in that: A pin seat (22) is fixed on the first supporting member (2), and a latch pin (32) is fixed on the second supporting member (3). When the first supporting member (2) and the second supporting member (3) are brought close to each other, the latch pin (32) and the pin seat (22) are plugged and connected. Both the latch pin (32) and the pin seat (22) are provided with through holes for the insertion rod (42) to pass through.

8. The water supply and drainage pipe orifice docking device according to claim 1, characterized in that: The second supporting member (3) is provided with a plurality of spring rods (7), and the plurality of spring rods (7) are arranged at intervals along the radial direction of the second supporting member (3).

9. The water supply and drainage pipe orifice docking device according to claim 8, characterized in that: A connecting rod (71) is arranged between adjacent spring rods (7), and a plurality of rollers (72) are rotatably connected to the connecting rod (71). The plurality of rollers (72) are arranged to fit the curvature of the second supporting member (3), and the rotation axis directions of the plurality of rollers (72) are all perpendicular to the movement direction of the second supporting member (3).

10. The water supply and drainage pipe orifice docking device according to claim 1, characterized in that: A cylinder (8) is fixed on one side of the base frame (11) close to the second supporting member (3). The cylinder (8) is arranged vertically, and a movable end of the cylinder (8) is rotatably connected to a secondary supporting member (81). The secondary supporting member (81) itself is provided with an arc, and the arc faces one side of the pipeline.

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