Forestry pest control equipment
By designing a spray mechanism that can lift and rotate, the problem that existing equipment cannot effectively spray higher plants is solved, and automated and full coverage spraying of plants at different heights and distribution locations is achieved, which improves work efficiency and reduces cost.
Patent Information
- Application Number
- CN202421056061.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-15
AI Technical Summary
Existing mobile pest control equipment cannot adjust the spray angle, resulting in higher plants being unable to be effectively sprayed, increasing the time and cost of manual spraying.
A forestry pest control equipment including a mobile carrier, a lifting mechanism, a rotating mechanism and a spray mechanism is designed. The lifting mechanism and rotating mechanism can adjust the position and angle of the spraying mechanism to ensure effective spraying of plants of different heights and distribution positions.
Automatic and full coverage spraying of plants with different heights and distribution locations is achieved, reducing the time and cost of manual spraying and improving work efficiency.
Smart Images

Figure CN222465801U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of forestry pest control, in particular to a forestry pest control device. Background Art
[0002] Forestry refers to the production sector that protects the ecological environment and maintains ecological balance, cultivates and protects forests to obtain timber and other forest products, and utilizes the natural characteristics of forests to play a protective role. It is an important part of the national economy.
[0003] In daily maintenance, it is necessary to spray pesticides on plants to protect them. If pesticides are sprayed on plants manually, it will take a lot of time. The existing mobile pest control equipment cannot adjust the angle, resulting in taller plants being unable to be sprayed. In addition, the unsprayed plants need to be sprayed manually later, which prolongs the working time and increases the cost of the work. Utility Model Content
[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a forestry pest control device, comprising:
[0005] A mobile carrier, wherein the mobile carrier is movable on the carrier;
[0006] A lifting mechanism, the lifting mechanism is arranged on the mobile carrier, and the lifting mechanism can rise or fall along a first direction;
[0007] A rotating mechanism, the rotating mechanism is disposed on the lifting mechanism and is rotatable in a second direction on the lifting mechanism;
[0008] Two spray mechanisms are respectively arranged at two ends of the rotating mechanism, so as to be driven up or down by the lifting mechanism, or driven to rotate by the rotating mechanism, and the two spray mechanisms can rotate in a third direction on the rotating mechanism to adjust the spraying angle.
[0009] Preferably, a mounting groove is provided on the top of the mobile carrier.
[0010] Preferably, the lifting mechanism comprises:
[0011] A bottom plate, the bottom plate being arranged in the mounting groove;
[0012] A plurality of first fixing seats, wherein the plurality of first fixing seats are arranged on the bottom plate at equal intervals;
[0013] A plurality of first fixed shafts, wherein the plurality of first fixed shafts are respectively disposed in the plurality of first fixed seats;
[0014] A plurality of first connecting shafts, wherein the plurality of first fixing shafts are respectively sleeved on the plurality of first fixing shafts and are respectively rotatably connected with the plurality of first fixing shafts;
[0015] A plurality of first connecting seats, wherein the plurality of first connecting seats are rotatably connected to the plurality of first connecting shafts respectively;
[0016] A plurality of gas rods are respectively arranged on the tops of the plurality of first connecting seats.
[0017] Preferably, the lifting mechanism further comprises:
[0018] A plurality of second connection seats, wherein the plurality of second connection seats are respectively connected to the transmission ends of the plurality of gas rods;
[0019] A plurality of second connecting shafts, wherein the plurality of second connecting shafts are respectively disposed in the plurality of second connecting seats and are respectively rotatably connected to the plurality of second connecting seats;
[0020] A plurality of second fixed shafts, wherein the plurality of second fixed shafts are respectively sleeved on the plurality of second connecting shafts and are respectively rotatably connected to the plurality of second connecting shafts;
[0021] A plurality of second fixing seats, wherein the plurality of second fixing seats are rotatably connected to the plurality of second fixing shafts respectively;
[0022] A support plate is arranged on the top of the plurality of second fixing seats.
[0023] Preferably, the rotating mechanism comprises:
[0024] A bracket, the bracket being arranged on the support plate;
[0025] A fixing plate, the fixing plate being arranged on the bracket;
[0026] A slide groove, which is arranged on the fixed plate and is arranged in a ring shape;
[0027] A first rotating shaft, the first rotating shaft is vertically disposed on the fixing plate and is rotatably connected to the fixing plate;
[0028] A first gear is disposed on the first rotating shaft.
[0029] Preferably, the rotating mechanism further comprises:
[0030] A first motor, wherein the first motor is disposed on the support plate, and a transmission shaft of the first motor passes through the fixing plate and is transmission-connected to the first rotating shaft;
[0031] Two sliding posts, the two sliding posts are arranged in the sliding groove opposite to each other and are respectively slidably connected to the sliding groove;
[0032] Two second gears, wherein the two second gears are respectively arranged on the two sliding posts;
[0033] Two fixing frames, the two fixing frames are respectively arranged on the two second gears;
[0034] Two mounting plates are respectively arranged on the two fixing frames.
[0035] Preferably, the spray mechanism comprises:
[0036] A first connecting plate, the first connecting plate is arranged on the mounting plate;
[0037] a second connecting plate, the second connecting plate being arranged on the mounting plate and spaced apart from the first connecting plate;
[0038] A second rotating shaft is disposed in the first connecting plate and is rotatably connected to the first connecting plate, and two ends of the second rotating shaft extend to two sides of the first connecting plate respectively;
[0039] a third rotating shaft, the third rotating shaft being disposed in the second connecting plate and being rotatably connected to the second connecting plate, and an end of the third rotating shaft extending to the inner side of the second connecting plate;
[0040] A shower head is arranged between the second rotating shaft and the third rotating shaft, and two sides of the shower head are respectively connected to the second rotating shaft and the third rotating shaft.
[0041] Preferably, the spray mechanism further comprises:
[0042] a first rotating wheel, wherein the first rotating wheel is connected to the second rotating shaft;
[0043] a fourth rotating shaft, the fourth rotating shaft being rotatably disposed in the first connecting plate and being spaced apart at the bottom of the second rotating shaft, and the fourth rotating shaft extending to the outer side of the first connecting plate;
[0044] a second rotating wheel, the second rotating wheel being connected to the fourth rotating shaft;
[0045] A belt, wherein the belt is sleeved on the first rotating wheel and the second rotating wheel;
[0046] The second motor is arranged on the mounting plate, and the transmission shaft of the second motor is transmission-connected with the second rotating wheel.
[0047] The above solution of the utility model includes at least the following beneficial effects:
[0048] The mobile carrier drives the lifting mechanism, the rotating mechanism and the two spraying mechanisms to move among the plants. When starting to work, the two spraying mechanisms spray the plants. When encountering higher plants, the lifting mechanism drives the rotating mechanism and the two spraying mechanisms to rise in a first direction so that the two spraying mechanisms can spray the higher plants. When the two spraying mechanisms are working, the rotating mechanism drives the two spraying mechanisms to rotate so that the two spraying mechanisms can spray the surrounding plants, thereby ensuring that the two spraying mechanisms can spray plants of different heights and distribution positions.
[0049] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0050] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0051] Figure 1 It is a structural schematic diagram of a forestry pest control device provided in an embodiment of the utility model;
[0052] Figure 2 It is a schematic diagram of the structure of the installation slot provided in the embodiment of the utility model;
[0053] Figure 3 It is a structural schematic diagram of a lifting mechanism provided in an embodiment of the utility model;
[0054] Figure 4 yes Figure 3 A magnified view of part A;
[0055] Figure 5 yes Figure 3 A magnified view of part B;
[0056] Figure 6 It is a structural schematic diagram of a rotating mechanism provided in an embodiment of the utility model;
[0057] Figure 7 It is a structural schematic diagram of a spray mechanism provided in an embodiment of the utility model;
[0058] Figure 8 yes Figure 6 Enlarged view of part C.
[0059] Description of Figure Numbers:
[0060] 1. Mobile carrier, 2. Lifting mechanism, 3. First direction, 4. Rotating mechanism, 5. Second direction, 6. Spraying mechanism, 7. Third direction;
[0061] 101, mounting slot;
[0062] 201, bottom plate, 202, first fixed seat, 203, first fixed shaft, 204, first connecting shaft, 205, first connecting seat, 206, gas rod, 207, second connecting seat, 208, second connecting shaft, 209, second fixed shaft, 210, second fixed seat, 211, supporting plate;
[0063] 401, bracket, 402, fixing plate, 403, slide slot, 404, first rotating shaft, 405, first gear, 406, first motor, 407, sliding column, 408, second gear, 409, fixing frame, 410, mounting plate;
[0064] 601. First connecting plate, 602. Second connecting plate, 603. Second rotating shaft, 604. Third rotating shaft, 605. Sprinkler head, 606. First rotating wheel, 607. Fourth rotating shaft, 608. Second rotating wheel, 609. Belt, 610. Second motor.
[0065] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0066] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.
[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0069] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0070] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0071] The forestry pest control equipment according to the embodiment of the utility model will be described in detail below with reference to the accompanying drawings.
[0072] See also Figures 1 to 8In this embodiment, it includes: a mobile carrier 1, which can be moved on the carrier; a lifting mechanism 2, which is arranged on the mobile carrier 1, and the lifting mechanism 2 can rise or fall along a first direction 3; a rotating mechanism 4, which is arranged on the lifting mechanism 2 and can rotate on the lifting mechanism 2 in a second direction 5; two spraying mechanisms 6, which are respectively arranged at two ends of the rotating mechanism 4, so as to be driven to rise or fall by the lifting mechanism 2, or driven to rotate by the rotating mechanism 4, and the two spraying mechanisms 6 can rotate on the rotating mechanism 4 in a third direction 7, so as to be suitable for adjusting the spraying angle; the mobile carrier The body 1 drives the lifting mechanism 2, the rotating mechanism 4 and the two spraying mechanisms 6 to move among the plants. When starting to work, the two spraying mechanisms 6 spray the plants. When encountering higher plants, the lifting mechanism 2 drives the rotating mechanism 4 and the two spraying mechanisms 6 to rise along the first direction 3, so that the two spraying mechanisms 6 can spray the higher plants. Moreover, when the two spraying mechanisms 6 are working, the rotating mechanism 4 drives the two spraying mechanisms 6 to rotate, so that the two spraying mechanisms 6 can spray the surrounding plants, thereby ensuring that the two spraying mechanisms 6 can spray plants of different heights and distribution positions.
[0073] In this embodiment, a mounting groove 101 is provided on the top of the mobile carrier 1 ; the lift is disposed in the mounting groove 101 , and rises or falls along the first direction 3 in the mounting groove 101 .
[0074] In this embodiment, the lifting mechanism 2 includes: a bottom plate 201, the bottom plate 201 is arranged in the installation groove 101; a plurality of first fixed seats 202, the plurality of first fixed seats 202 are arranged on the bottom plate 201 at equal intervals; a plurality of first fixed shafts 203, the plurality of first fixed shafts 203 are respectively arranged in the plurality of first fixed seats 202; a plurality of first connecting shafts 204, the plurality of first fixed shafts 203 are respectively sleeved on the plurality of first fixed shafts 203, and are respectively rotatably connected to the plurality of first fixed shafts 203; a plurality of first connecting seats 205, the plurality of first connecting seats 205 are respectively rotatably connected to the plurality of first connecting shafts 204; a plurality of gas rods 206, the plurality of gas rods 206 are respectively arranged on the tops of the plurality of first connecting seats 205; the lifting mechanism 2 also includes: a plurality of second connecting seats 207, the plurality of second connecting seats 207 are respectively connected to the transmission ends of the plurality of gas rods 206; a plurality of second connecting shafts 20 8. Multiple second connecting shafts 208 are respectively arranged in multiple second connecting seats 207, and are respectively rotatably connected to the multiple second connecting seats 207; multiple second fixed shafts 209, multiple second fixed shafts 209 are respectively sleeved on the multiple second connecting shafts 208, and are respectively rotatably connected to the multiple second connecting shafts 208; multiple second fixed seats 210, multiple second fixed seats 210 are respectively rotatably connected to the multiple second fixed shafts 209; a support plate 211, the support plate 211 is arranged on the top of the multiple second fixed seats 210; multiple gas rods 206 are inclined in the same direction, when the multiple gas rods 206 push and drag to rise along the first direction 3, the rotating mechanism 4 and the two spraying mechanisms 6 on the support plate 211 also rise with it; and one of the multiple gas rods 206 can rise or fall alone, so that the spraying mechanism 6 can spray at an angle, so as to spray a plant alone.
[0075] In this embodiment, the rotating mechanism 4 includes: a bracket 401, the bracket 401 is arranged on the support plate 211; a fixed plate 402, the fixed plate 402 is arranged on the bracket 401; a slide groove 403, the slide groove 403 is arranged on the fixed plate 402 and is arranged in an annular shape; a first rotating shaft 404, the first rotating shaft 404 is vertically arranged on the fixed plate 402 and is rotatably connected with the fixed plate 402; a first gear 405, the first gear 405 is arranged on the first rotating shaft 404; the rotating mechanism 4 also includes: a first motor 406, the first motor 406 is arranged on the support plate 211, and the transmission shaft of the first motor 406 passes through the fixed plate 402 and is transmission-connected with the first rotating shaft 404; two sliding columns 407, the two sliding columns 407 are relatively arranged in the slide groove 403, and are respectively slidably connected with the slide groove 403; two second gears 408 , the two second gears 408 are respectively arranged on the two sliding columns 407; the two fixing frames 409, the two fixing frames 409 are respectively arranged on the two second gears 408; the two mounting plates 410, the two mounting plates 410 are respectively arranged on the two fixing frames 409; the two spraying mechanisms 6 are respectively arranged on the two mounting plates 410. When the two spraying mechanisms 6 need to rotate, the first motor 406 drives the first gear 405 to rotate, and the first gear 405 engages with the two second gears 408, so that the two second gears 408 slide in the slide groove 403 through the two sliding columns 407, and the two mounting plates 410 on the top of the two gears follow the movement, and the two spraying mechanisms 6 arranged on the two mounting plates 410 move in the second direction 5, so that the two spraying mechanisms 6 can spray the surrounding plants.
[0076] In this embodiment, the spray mechanism 6 includes: a first connecting plate 601, the first connecting plate 601 is arranged on the mounting plate 410; a second connecting plate 602, the second connecting plate 602 is arranged on the mounting plate 410 and is spaced apart from the first connecting plate 601; a second rotating shaft 603, the second rotating shaft 603 is arranged in the first connecting plate 601, and is rotatably connected to the first connecting plate 601, and the two ends of the second rotating shaft 603 extend to the two sides of the first connecting plate 601 respectively; The third rotating shaft 604 is disposed in the second connecting plate 602 and is rotatably connected to the second connecting plate 602, and the end of the third rotating shaft 604 extends to the inner side of the second connecting plate 602; the spray head 605 is disposed between the second rotating shaft 603 and the third rotating shaft 604, and the two sides of the spray head 605 are respectively connected to the second rotating shaft 603 and the third rotating shaft 604; the spray mechanism 6 also includes: a first rotating wheel 606, the first rotating wheel 606 and the third rotating wheel 604 are connected to each other; The second rotating shaft 603 is connected; the fourth rotating shaft 607 is rotatably disposed in the first connecting plate 601 and is spaced at the bottom of the second rotating shaft 603, and the fourth rotating shaft 607 extends to the outside of the first connecting plate 601; the second rotating wheel 608, the second rotating wheel 608 is connected to the fourth rotating shaft 607; the belt 609, the belt 609 is sleeved on the first rotating wheel 606 and the second rotating wheel 608; the second motor 610, the second motor 610 is disposed on the mounting plate 410 On, the transmission shaft of the second motor 610 is connected to the second rotating wheel 608; when working, the second motor 610 drives the second rotating wheel 608 to rotate, the second rotating wheel 608 drives the first rotating wheel 606 to rotate through the belt 609, the first rotating wheel 606 drives the second rotating shaft 603 to rotate, and the second rotating shaft 603 drives the spray head 605 to rotate when rotating, so as to drive the spray head 605 to rotate toward the third direction 7, so that the angle and range of the spray head 605 are larger.
[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0078] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.
Claims
1. A forestry pest control device, characterized in that: include: A mobile carrier, wherein the mobile carrier is movable on the carrier; A lifting mechanism, the lifting mechanism is arranged on the mobile carrier, and the lifting mechanism can rise or fall along a first direction; A rotating mechanism, the rotating mechanism is disposed on the lifting mechanism and is rotatable in a second direction on the lifting mechanism; Two spray mechanisms are respectively arranged at two ends of the rotating mechanism, so as to be driven up or down by the lifting mechanism, or driven to rotate by the rotating mechanism, and the two spray mechanisms can rotate in a third direction on the rotating mechanism to adjust the spraying angle.
2. The forestry pest control equipment according to claim 1, characterized in that: The top of the mobile carrier is provided with a mounting groove.
3. The forestry pest control equipment according to claim 2, characterized in that: The lifting mechanism comprises: A bottom plate, the bottom plate being arranged in the mounting groove; A plurality of first fixing seats, wherein the plurality of first fixing seats are arranged on the bottom plate at equal intervals; A plurality of first fixed shafts, wherein the plurality of first fixed shafts are respectively disposed in the plurality of first fixed seats; A plurality of first connecting shafts, wherein the plurality of first fixing shafts are respectively sleeved on the plurality of first fixing shafts and are respectively rotatably connected with the plurality of first fixing shafts; A plurality of first connecting seats, wherein the plurality of first connecting seats are rotatably connected to the plurality of first connecting shafts respectively; A plurality of gas rods are respectively arranged on the tops of the plurality of first connecting seats.
4. The forestry pest control equipment according to claim 3, characterized in that: The lifting mechanism also includes: A plurality of second connection seats, wherein the plurality of second connection seats are respectively connected to the transmission ends of the plurality of gas rods; A plurality of second connecting shafts, wherein the plurality of second connecting shafts are respectively disposed in the plurality of second connecting seats and are respectively rotatably connected to the plurality of second connecting seats; A plurality of second fixed shafts, wherein the plurality of second fixed shafts are respectively sleeved on the plurality of second connecting shafts and are respectively rotatably connected to the plurality of second connecting shafts; A plurality of second fixing seats, wherein the plurality of second fixing seats are rotatably connected to the plurality of second fixing shafts respectively; A support plate is arranged on the top of the plurality of second fixing seats.
5. The forestry pest control equipment according to claim 4, characterized in that: The rotating mechanism comprises: A bracket, the bracket being arranged on the support plate; A fixing plate, the fixing plate being arranged on the bracket; A slide groove, which is arranged on the fixed plate and is arranged in a ring shape; A first rotating shaft, the first rotating shaft is vertically disposed on the fixing plate and is rotatably connected to the fixing plate; A first gear is disposed on the first rotating shaft.
6. The forestry pest control equipment according to claim 5, characterized in that: The rotating mechanism also includes: A first motor, wherein the first motor is disposed on the support plate, and a transmission shaft of the first motor passes through the fixing plate and is transmission-connected to the first rotating shaft; Two sliding posts, the two sliding posts are arranged in the sliding groove opposite to each other and are respectively slidably connected to the sliding groove; Two second gears, wherein the two second gears are respectively arranged on the two sliding posts; Two fixing frames, the two fixing frames are respectively arranged on the two second gears; Two mounting plates are respectively arranged on the two fixing frames.
7. The forestry pest control equipment according to claim 6, characterized in that: The spray mechanism comprises: A first connecting plate, the first connecting plate is arranged on the mounting plate; a second connecting plate, the second connecting plate being arranged on the mounting plate and spaced apart from the first connecting plate; A second rotating shaft is disposed in the first connecting plate and is rotatably connected to the first connecting plate, and two ends of the second rotating shaft extend to two sides of the first connecting plate respectively; a third rotating shaft, the third rotating shaft being disposed in the second connecting plate and being rotatably connected to the second connecting plate, and an end of the third rotating shaft extending to the inner side of the second connecting plate; A shower head is arranged between the second rotating shaft and the third rotating shaft, and two sides of the shower head are respectively connected to the second rotating shaft and the third rotating shaft.
8. The forestry pest control equipment according to claim 7, characterized in that: The spray mechanism also includes: a first rotating wheel, wherein the first rotating wheel is connected to the second rotating shaft; a fourth rotating shaft, the fourth rotating shaft being rotatably disposed in the first connecting plate and being spaced apart at the bottom of the second rotating shaft, and the fourth rotating shaft extending to the outer side of the first connecting plate; a second rotating wheel, the second rotating wheel being connected to the fourth rotating shaft; A belt, wherein the belt is sleeved on the first rotating wheel and the second rotating wheel; The second motor is arranged on the mounting plate, and the transmission shaft of the second motor is transmission-connected with the second rotating wheel.