Road washing conduit recovery device

Abstract

The utility model discloses a kind of road cleaning pipeline recovery devices, belong to pipeline recovery field, comprising: support seat, it is rotationally connected with rotary shaft;The rotary shaft is fixedly installed with winding disc;Winding plate is rotationally connected with the winding disc;The winding disc circumferentially is uniformly distributed with the winding plate;Middle seat is fixedly connected with the winding disc;The middle seat is rotationally connected with screw No. 1;Driving block is threadedly connected with the screw No. 1;The driving block is rotationally connected with driving rod;The driving rod is same in number with the winding plate;Compared with prior art, the road cleaning pipeline recovery device of the present application is changed by setting the winding drum of variable diameter consisting of winding plate, when taking down pipeline, winding plate is retracted at one end, winding plate is changed from cylindrical to conical, so that pipeline can be shed along conical surface, so as to quickly take out pipeline, so as to solve the problem of inconvenient pipeline replacement.

Description

Technical Field

[0001] This utility model relates to the field of pipeline recycling, specifically to a road cleaning pipeline recycling device. Background Technology

[0002] During road cleaning, operators need to hold the pipe roll while laying the pipe, and then recycle the pipe after the operation is completed. In the process of pipe winding, the winding mechanism consists of a motor and a winding drum, with the output end of the motor connected to the winding drum. During operation, the motor starts, causing the winding drum to rotate, thereby winding the pipe. Application number CN201721007337.0 proposes a hose winding device for sewer unclogging. The active component, the sun gear, is driven by a hand crank. Since the planetary gears mesh with the sun gear, the sun gear drives the planetary gears to rotate. Because the internal gear ring meshes with the planetary gears, and one end of the planetary gear is confined to the inner wall of the protective cover, the planetary gears rotate while driving the outer internal gear ring to rotate as well, thus causing the drum to rotate. At the same time, handles are provided at both ends of the drum, allowing two operators to rotate it together, thereby realizing the functions of hose winding and conveying. However, when the pipe is damaged and needs to be replaced, since the pipe is wrapped around the winding drum, the winding drum needs to be removed or the pipe needs to be released for replacement. Therefore, a road cleaning pipe recycling device is proposed. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model proposes a road cleaning pipeline recycling device. By incorporating a take-up roller with a variable diameter, the pipeline can be quickly removed from the take-up roller, thereby solving the problem of inconvenient pipeline replacement.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A road cleaning pipeline recycling device, comprising:

[0006] A support base is rotatably connected to a rotating shaft; a winding reel is fixedly mounted on the rotating shaft.

[0007] A take-up plate is rotatably connected to the take-up reel; the take-up plates are evenly distributed around the circumference of the take-up reel, that is, all the take-up plates form the shape of a take-up drum, which is used to wind the pipeline.

[0008] An intermediate seat is fixedly connected to the winding reel; a screw is rotatably connected to the intermediate seat.

[0009] A drive block is threadedly connected to the screw; the drive block is rotatably connected to a drive rod; the number of drive rods is the same as the number of take-up plates; each drive rod is rotatably connected to one of the take-up plates.

[0010] The movable seat moves linearly along the axis of the screw; a movable plate is fixedly installed on the movable seat; a fixed frame is fixedly installed on the movable plate; a pressure plate that can move linearly is provided inside the fixed frame; the nozzle, i.e., the water outlet end, of the pipeline is placed between the fixed frame and the pressure plate.

[0011] Initially, the take-up plate is cylindrical, placing the outlet end of the pipe between the fixed frame and the pressure plate; the delivery end of the pipe passes through the take-up plate and exits between the drive rods; rotating the rotary shaft drives the take-up reel and take-up plate to rotate, causing the pipe to wind around the take-up plate to form a take-up roller; to release the pipe, rotating the rotary shaft releases it; during winding, the rotary shaft drives the take-up reel to rotate, simultaneously driving the pressure plate to move, changing the distance between the fixed frame and the pressure plate, pressing but not crushing the pipe, thus winding it up. The disc can be moved while in motion; by moving the movable seat, the position of the fixed frame and the pressure plate is changed, which also changes the position of the pipeline on the winding plate, so that the winding plate can evenly wind the pipeline along the axial direction; when unloading the pipeline, rotate screw one. Since the drive block is restricted from rotating by the drive rod and the winding plate, screw one drives the drive block to move through the thread. The drive block drives the drive rod to pull one end of the winding plate to retract, so that the overall shape of the winding plate changes from cylindrical to conical. At this time, the pipeline can be removed from the conical surface.

[0012] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0013] In this application, a fixed connection refers to a connection where, after the parts or components are installed, there is no relative movement. Common examples include using screws, splines, wedges, etc., to fix parts together. This type of connection can be disassembled during maintenance without damaging the parts; it can also be called a detachable fixed connection. Other methods include welding, riveting, and tenon joints. These methods require forging, sawing, or oxy-acetylene cutting for disassembly during maintenance or replacement, so the parts generally cannot be reused. In this application, a rotating connection refers to a connection where, after the parts or components are installed, the parts rotate relative to the fixed part. A common form is a relationship where a bearing is mounted on the fixed part, with the part mounted on the inner or outer ring of the bearing, allowing the bearing to achieve rotational movement. In this application, a sliding connection refers to a connection where, after the parts or components are installed, the parts can move on the fixed part.

[0014] In some embodiments, the support base is fixedly mounted with a screw seat; the screw seat is provided with a sliding groove; the movable seat is slidably connected to the sliding groove; a second screw is rotatably connected to the support base inside the sliding seat; the second screw is threadedly connected to the movable seat; the support base is symmetrically rotatably connected to two drive shafts about the second screw; each drive shaft is fixedly mounted with a spur gear; the first spur gears mesh with each other; each first spur gear is fixedly mounted with an arc-shaped rack; the second screw is fixedly mounted with a second spur gear; the second spur gear can selectively mesh with one of the arc-shaped racks.

[0015] In some embodiments, the support base is fixedly mounted with a protective cover; both the first spur gear and the second spur gear are disposed inside the protective cover; the protective cover is fixedly mounted with a first motor; the first motor is connected to one of the drive shafts; the support base is fixedly mounted with a second motor; the second motor is connected to the rotary shaft.

[0016] In some embodiments, the fixed frame includes a side plate and a top plate; two side plates are symmetrically fixedly installed on the movable plate; the side plates are provided with grooves; a limiting plate is fixedly installed in the grooves on the top plate; the limiting plate is provided with threaded holes; a through hole is provided on the side of the groove near the threaded hole; a knob is provided on the outer side of the side plate; the knob is threadedly connected to the threaded hole.

[0017] In some embodiments, an electric push rod is fixedly installed on the movable plate; the electric push rod is fixedly connected to the pressure plate.

[0018] In some embodiments, a fixing plate is further included; the fixing plate is provided with a slot; one end of the take-up plate is disposed in the slot; the take-up plate and the fixing plate are connected by screws.

[0019] In some embodiments, the fixing plate is provided with a through hole; a handle is fixedly installed on one side of the screw that passes through the through hole.

[0020] In some embodiments, the support base is fixedly mounted with a base plate; the base plate has mounting holes distributed in a matrix.

[0021] The beneficial effects of this utility model are:

[0022] This utility model of a road cleaning pipeline recovery device uses a variable-diameter take-up roller composed of a take-up plate. When removing the pipeline, one end of the take-up plate is retracted, changing the take-up plate from a cylindrical shape to a conical shape, allowing the pipeline to detach along the conical surface, thus quickly removing the pipeline and solving the problem of inconvenient pipeline replacement. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a three-dimensional structural diagram of the present application;

[0025] Figure 2 This is a schematic diagram of the diskless structure of this application;

[0026] Figure 3 This is a schematic diagram of the interior of the protective cover in this application. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] This utility model of a road cleaning pipeline recovery device uses a variable-diameter take-up roller composed of a take-up plate. When removing the pipeline, one end of the take-up plate is retracted, changing the take-up plate from a cylindrical shape to a conical shape, allowing the pipeline to detach along the conical surface, thus quickly removing the pipeline and solving the problem of inconvenient pipeline replacement.

[0031] Please refer to Figures 1 to 3 A road cleaning pipeline recycling device, comprising:

[0032] Support base 1, which is rotatably connected to a rotating shaft; a winding reel 2 is fixedly installed on the rotating shaft;

[0033] The take-up plate 3 is rotatably connected to the take-up reel 2; the take-up reel 2 is circumferentially distributed with the take-up plates 3, that is, all the take-up plates 3 form the shape of a take-up drum, which is used to wind the pipeline.

[0034] The intermediate seat is fixedly connected to the winding reel 2; the intermediate seat is rotatably connected to the screw 4.

[0035] Drive block 5 is threadedly connected to screw 4; drive block 5 is rotatably connected to drive rod 6; the number of drive rods 6 is the same as the number of take-up plates 3; drive rod 6 is rotatably connected to one take-up plate 3 respectively.

[0036] The movable seat 7 moves linearly along the axis of the screw 4; the movable seat 7 is fixedly mounted with a movable plate; the movable plate is fixedly mounted with a fixed frame; the fixed frame is equipped with a linearly movable pressure plate 8; the nozzle of the pipeline, i.e., the water outlet, is placed between the fixed frame and the pressure plate 8.

[0037] Initially, the take-up plate 3 is cylindrical, placing the outlet end of the pipe between the fixed frame and the pressure plate 8; the delivery end of the pipe passes through the take-up plates 3 and exits between the drive rods 6; rotating the rotary shaft drives the take-up reel 2 and the take-up plate 3 to rotate, thus winding the pipe around the take-up plate 3 to form a take-up drum; to release the pipe, rotating the rotary shaft releases it; during winding, the rotary shaft drives the take-up reel 2 to rotate, simultaneously driving the pressure plate 8 to move, changing the distance between the fixed frame and the pressure plate 8, pressing but not crushing the pipe, the pipe is carried by the take-up reel 2 The device can be moved during operation; by moving the movable seat 7, the position of the fixed frame and the pressure plate 8 is changed, which also changes the position of the pipeline on the winding plate 3, so that the winding plate 3 can evenly wind the pipeline along the axial direction; when unloading the pipeline, the screw 4 is rotated. Since the drive block 5 is restricted from rotating by the drive rod 6 and the winding plate 3, the screw 4 drives the drive block 5 to move through the thread. The drive block 5 drives the drive rod 6 to pull one end of the winding plate 3 to retract, so that the overall shape of the winding plate 3 changes from cylindrical to conical. At this time, the pipeline can be removed from the conical surface.

[0038] In this application, the linearly movable seat 7 and pressure plate 8 can both be implemented by a linear drive mechanism, such as a hydraulic push rod, an electric push rod, or a pneumatic push rod. Of course, other structures that can change the position of the connecting end can also be used, such as the chain lifting mechanism used in forklifts, the scissor telescopic mechanism used in scissor lifts, and the screw lifting mechanism in screw lifts.

[0039] In this application, the cross-section of the winding plate 3 is arc-shaped as shown in the figure. However, the winding plate 3 is not the only shape; the cross-section of the winding plate 3 can be rectangular, pentagonal, or even irregular. It is only necessary to ensure that all winding plates 3 can form a circular or near-circular polygonal shape. The optimal shape of the winding plate 3 in this application is arc-shaped, which is convenient for winding the pipeline.

[0040] In some embodiments, a screw seat 9 is fixedly mounted on the support base 1; the screw seat 9 is provided with a sliding groove; the movable seat 7 is slidably connected to the sliding groove; a second screw 10 is rotatably connected to the support base 1 inside the screw seat 9; the second screw 10 is threadedly connected to the movable seat 7; the support base 1 is symmetrically rotatably connected to two drive shafts about the second screw 10; each drive shaft is fixedly mounted with a first spur gear 11; the first spur gears 11 mesh with each other; each first spur gear 11 is fixedly mounted with an arc-shaped rack 12; the second screw 10 is fixedly mounted with a second spur gear 13; the second spur gear 13 can selectively mesh with one arc-shaped rack 12, that is, the second spur gear 13 meshes with two arc-shaped racks 12. All racks 12 can mesh, but can only mesh with one arc rack 12 at a time. Only after meshing is completed can they mesh with another arc rack 12. After the drive shaft rotates, the two drive shafts rotate in opposite directions through a pair of meshing spur gears 11. The two arc racks 12 alternately drive the spur gears 13 to rotate. The spur gears 13 drive the screw 10 to rotate reciprocally. The screw 10 drives the movable seat 7 to move along the slide groove through the thread. The movable seat 7 moves back and forth within the length range of the winding plate 3, thereby preventing the movable seat 7 from exceeding the range, so that some pipelines of the winding plate 3 are not wound onto the collection plate during winding.

[0041] In some embodiments, a protective cover 14 is fixedly installed on the support base 1; a first spur gear 11 and a second spur gear 13 are both disposed inside the protective cover 14; a first motor 15 is fixedly installed on the protective cover 14; the first motor 15 is connected to a drive shaft; a second motor 16 is fixedly installed on the support base 1; the second motor 16 is connected to a rotary shaft; the first motor 15 is used to drive the drive shaft to rotate, and the second motor 16 is used to drive the rotary shaft to rotate.

[0042] In some embodiments, the fixed frame includes side plates 17 and a top plate 18; two side plates 17 are symmetrically fixedly installed on the movable plate; the side plates 17 are provided with grooves; a limiting plate is fixedly installed in the groove of the top plate 18; the limiting plate is provided with threaded holes; a through hole is provided on the side of the groove near the threaded hole; a knob 19 is provided on the outer side of the side plates 17; the knob 19 is threadedly connected to the threaded hole; rotating the knob 19 will remove the top plate 18, which is convenient for placing pipelines. If the nozzle of a pipeline is too large to pass through the fixed frame, the pipeline will be placed in a way that facilitates the placement of the pipeline.

[0043] In some embodiments, an electric push rod 20 is fixedly installed on the movable plate; the electric push rod 20 is fixedly connected to the pressure plate 8; the electric push rod 20 is used to drive the pressure plate 8 to move linearly.

[0044] In some embodiments, a fixing plate 21 is also included; the fixing plate 21 is provided with a slot; one end of the winding plate 3 is disposed in the slot; the winding plate 3 and the fixing plate 21 are connected by screws; the fixing plate 21 is used to assist in fixing the winding plate 3, and the fixing plate 21 can be removed when the pipeline is removed.

[0045] In some embodiments, the fixed plate 21 is provided with a through hole; a handle 22 is fixedly installed on the side of the screw 4 that passes through the through hole, so as to facilitate driving the screw 4 to rotate.

[0046] In some embodiments, a base plate 23 is fixedly mounted on the support base 1; the base plate 23 has mounting holes arranged in a matrix; the mounting holes are used to install screws, which facilitates the fixing of the support base 1 to the carrier.

[0047] The road cleaning pipeline recycling device provided by this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0048] A road cleaning pipeline recycling device, comprising:

[0049] Support base 1, which is rotatably connected to a rotating shaft; a winding reel 2 is fixedly installed on the rotating shaft;

[0050] The take-up plate 3 is rotatably connected to the take-up reel 2; the take-up reel 2 is circumferentially distributed with the take-up plates 3, that is, all the take-up plates 3 form the shape of a take-up drum, which is used to wind the pipeline.

[0051] The intermediate seat is fixedly connected to the winding reel 2; the intermediate seat is rotatably connected to the screw 4.

[0052] Drive block 5 is threadedly connected to screw 4; drive block 5 is rotatably connected to drive rod 6; the number of drive rods 6 is the same as the number of take-up plates 3; drive rod 6 is rotatably connected to one take-up plate 3 respectively.

[0053] The movable seat 7 moves linearly along the axis of the screw 4; the movable seat 7 is fixedly mounted with a movable plate; the movable plate is fixedly mounted with a fixed frame; the fixed frame is equipped with a linearly movable pressure plate 8; the nozzle of the pipeline, i.e., the water outlet, is placed between the fixed frame and the pressure plate 8.

[0054] An electric push rod 20 is fixedly installed on the movable plate; the electric push rod 20 is fixedly connected to the pressure plate 8; the electric push rod 20 is used to drive the pressure plate 8 to move linearly.

[0055] A screw seat 9 is fixedly mounted on the support base 1; the screw seat 9 is provided with a sliding groove; the movable seat 7 is slidably connected to the sliding groove; a second screw 10 is rotatably connected to the support base 1 inside the screw seat 9; the second screw 10 is threadedly connected to the movable seat 7; the support base 1 is symmetrically connected to two drive shafts about the second screw 10; each drive shaft is fixedly mounted with a first spur gear 11; the first spur gears 11 mesh with each other; each first spur gear 11 is fixedly mounted with an arc-shaped rack 12; the second screw 10 is fixedly mounted with a second spur gear 13; the second spur gear 13 can selectively mesh with one arc-shaped rack 12, that is, the second spur gear 13 meshes with two arc-shaped racks 12. Both can mesh, but can only mesh with one arc-shaped rack 12 at a time. Only after meshing is completed can it mesh with the other arc-shaped rack 12. After the drive shaft rotates, the two drive shafts rotate in opposite directions through a pair of meshing spur gears 11. The two arc-shaped racks 12 alternately drive the spur gears 13 to rotate. The spur gears 13 drive the screw 10 to rotate reciprocally. The screw 10 drives the movable seat 7 to move along the slide groove through the thread. The movable seat 7 moves back and forth within the length range of the winding plate 3, thereby preventing the movable seat 7 from exceeding the range, so that some pipelines of the winding plate 3 are not wound onto the collection plate during winding.

[0056] A protective cover 14 is fixedly installed on the support base 1; spur gear 11 and spur gear 2 13 are both set inside the protective cover 14; motor 15 is fixedly installed on the protective cover 14; motor 15 is connected to a drive shaft; motor 2 16 is fixedly installed on the support base 1; motor 2 16 is connected to a rotary shaft; motor 15 is used to drive the drive shaft to rotate, and motor 2 16 is used to drive the rotary shaft to rotate.

[0057] Initially, the take-up plate 3 is cylindrical, placing the outlet end of the pipe between the fixed frame and the pressure plate 8; the delivery end of the pipe passes through the take-up plates 3 and exits between the drive rods 6; rotating the rotary shaft drives the take-up reel 2 and the take-up plate 3 to rotate, thus winding the pipe around the take-up plate 3 to form a take-up drum; to release the pipe, rotating the rotary shaft releases it; during winding, the rotary shaft drives the take-up reel 2 to rotate, simultaneously driving the pressure plate 8 to move, changing the distance between the fixed frame and the pressure plate 8, pressing but not crushing the pipe, the pipe is carried by the take-up reel 2 The device can be moved during operation; by moving the movable seat 7, the position of the fixed frame and the pressure plate 8 is changed, which also changes the position of the pipeline on the winding plate 3, so that the winding plate 3 can evenly wind the pipeline along the axial direction; when unloading the pipeline, the screw 4 is rotated. Since the drive block 5 is restricted from rotating by the drive rod 6 and the winding plate 3, the screw 4 drives the drive block 5 to move through the thread. The drive block 5 drives the drive rod 6 to pull one end of the winding plate 3 to retract, so that the overall shape of the winding plate 3 changes from cylindrical to conical. At this time, the pipeline can be removed from the conical surface.

[0058] The fixed frame includes side plates 17 and a top plate 18; two side plates 17 are symmetrically fixedly installed on the movable plate; the side plates 17 are provided with grooves; a limiting plate is fixedly installed in the groove of the top plate 18; the limiting plate is provided with threaded holes; a through hole is provided on the side of the groove near the threaded hole; a knob 19 is provided on the outer side of the side plate 17; the knob 19 is threadedly connected to the threaded hole; rotating the knob 19 will remove the top plate 18, which is convenient for placing pipelines. If the nozzle of some pipelines is too large to pass through the fixed frame, it will be placed in the fixed frame.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A road cleaning pipeline recycling device, characterized in that, include: A support base (1) is rotatably connected to a rotating shaft; a winding reel (2) is fixedly installed on the rotating shaft; A take-up plate (3) is rotatably connected to the take-up reel (2); the take-up reel (2) is circumferentially distributed with the take-up plates (3); An intermediate seat is fixedly connected to the winding reel (2); the intermediate seat is rotatably connected to a screw (4); A drive block (5) is threadedly connected to the screw (4); the drive block (5) is rotatably connected to a drive rod (6); the number of drive rods (6) is the same as that of the winding plates (3); the drive rods (6) are rotatably connected to one of the winding plates (3); The movable seat (7) moves linearly along the axis of the screw (4); the movable seat (7) is fixedly mounted with a movable plate; the movable plate is fixedly mounted with a fixed frame; and the fixed frame is provided with a linearly movable pressure plate (8).

2. The road washing conduit recovery apparatus of claim 1, wherein, The support base (1) is fixedly mounted with a screw seat (9); the screw seat (9) is provided with a sliding groove; the movable seat (7) is slidably connected to the sliding groove; the support base (1) is rotatably connected with a second screw (10) inside the screw seat (9); the second screw (10) is threadedly connected to the movable seat (7); the support base (1) is symmetrically rotatably connected with two drive shafts about the second screw (10); each drive shaft is fixedly mounted with a first spur gear (11); the first spur gears (11) mesh with each other; each first spur gear (11) is fixedly mounted with an arc rack (12); the second screw (10) is fixedly mounted with a second spur gear (13); the second spur gear (13) can selectively mesh with one of the arc racks (12).

3. The road washing conduit recovery apparatus of claim 2, wherein, The support base (1) is fixedly mounted with a protective cover (14); the first spur gear (11) and the second spur gear (13) are both disposed inside the protective cover (14); the protective cover (14) is fixedly mounted with a motor (15); the first motor (15) is connected to one of the drive shafts; the support base (1) is fixedly mounted with a second motor (16); the second motor (16) is connected to the rotary shaft.

4. The road washing conduit recovery apparatus of claim 3, wherein, The fixed frame includes a side plate (17) and a top plate (18); two side plates (17) are symmetrically fixedly installed on the movable plate; the side plate (17) is provided with a groove; a limiting plate is fixedly installed in the groove on the top plate (18); the limiting plate is provided with a threaded hole; a through hole is provided on the side of the groove near the threaded hole; a knob (19) is provided on the outer side of the side plate (17); the knob (19) is threadedly connected to the threaded hole.

5. The road washing conduit recovery apparatus of claim 4, wherein, The movable plate is fixedly equipped with an electric push rod (20); the electric push rod (20) is fixedly connected to the pressure plate (8).

6. The road washing conduit recovery apparatus of claim 2, wherein, It also includes a fixing plate (21); the fixing plate (21) is provided with a slot; one end of the winding plate (3) is disposed in the slot; the winding plate (3) and the fixing plate (21) are connected by screws.

7. The road washing conduit recovery apparatus of claim 6, wherein, The fixed plate (21) is provided with a through hole; a handle (22) is fixedly installed on one side of the screw (4) that passes through the through hole.

8. The road washing conduit recovery apparatus of claim 1, wherein, The support base (1) is fixedly mounted with a base plate (23); the base plate (23) has mounting holes distributed in a matrix.

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