Reversing type baking machine
By setting up staggered gates and telescopic units in the baking machine, the baking air direction can be reversed. By using the air distribution plate and dust collection box, the problems of uneven heating of materials and poor versatility in the baking machine are solved, thereby improving the baking quality and dust treatment effect.
Patent Information
- Application Number
- CN202520276466.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Existing baking machines have a single baking airflow direction, resulting in uneven heating of materials and failing to meet the baking needs of different materials, thus having poor versatility.
Design a reversing baking machine. By setting staggered gates and telescopic units on the left and right sides of the baking chamber, the baking air direction can be reversed. A uniform air distribution plate is set in the baking chamber to evenly distribute the hot air. Combined with a dust collection box, dust and impurities in the waste heat are collected.
It achieves uniform baking of materials and versatility of equipment, avoids concentrated heating of materials by hot air, improves baking quality, and effectively collects and settles dust and impurities in waste heat.
Smart Images
Figure CN223896524U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of baking machine technology, specifically to a reversible baking machine. Background Technology
[0002] In the field of modern baking technology, baking machines, as important processing equipment, are widely used in the baking of materials in the food, medicine, and agricultural product industries.
[0003] However, most existing baking machines have a fixed baking air direction. This single baking air direction not only results in a large temperature difference between the heated and unheated sides of the material, leading to uneven baking, but also fails to meet the baking needs of different materials (because different materials have different baking characteristics due to differences in moisture content, heat sensitivity, etc.), thus resulting in poor versatility of the baking machine. Summary of the Invention
[0004] This invention addresses the problem that existing baking machines, due to their relatively singular baking airflow direction, cannot guarantee the uniformity of material baking and have poor versatility. It provides a reversible baking machine that can adjust the baking airflow direction according to the baking characteristics of different materials, thereby ensuring the uniformity of material baking and improving baking quality.
[0005] To solve the above problems, the technical solution of this utility model is:
[0006] A reversible baking machine includes a fan and a heating box, and also includes a baking box with openings on the left and right sides, wherein the fan, heating box and baking box are connected sequentially from right to left;
[0007] The baking oven is equipped with gates on both the left and right sides. The gate on the left side of the baking oven moves up and down to cover the upper or lower part of the opening to form a left ventilation opening, and the gate on the right side of the baking oven moves up and down to cover the upper or lower part of the opening to form a right ventilation opening.
[0008] Alternatively, the gate on the left side of the baking oven can be moved back and forth to cover the front or rear of the opening to form a left ventilation opening, and the gate on the right side of the baking oven can be moved back and forth to cover the front or rear of the opening to form a right ventilation opening.
[0009] The left and right ventilation openings are arranged alternately.
[0010] By adopting the above scheme, by setting up a structure in which the fan, heating box and baking oven are connected in sequence from right to left, the air generated by the fan can be heated when it passes through the heating box, thus becoming hot air, and then enters the baking oven to bake the materials inside the baking oven.
[0011] Meanwhile, gates are installed on both the left and right sides of the baking oven. Due to the coverage of the gates, the openings on the left and right sides of the baking oven form staggered left and right ventilation openings. By moving the gates up and down or forward and backward, the positions of the left and right ventilation openings on the baking oven can be changed. However, the positions of the left and right ventilation openings are always staggered, so that hot air can blow towards the material from different directions. This realizes the reversal of the baking air direction of the baking machine, which can ensure the uniformity of the overall baking of the material and the versatility of the equipment.
[0012] Based on the above solution, the present invention can be further improved as follows:
[0013] Furthermore, the baking oven is provided with a left telescopic unit and a right telescopic unit on its left and right sides, respectively. The left telescopic unit and the right telescopic unit are connected to the gate on the corresponding side and drive the gate to move in the up-down or back-forward direction. By driving the gate to move through the left telescopic unit and the right telescopic unit, the flow direction of hot air inside the baking oven can be changed.
[0014] Furthermore, the baking oven is equipped with a material hopper and at least two air distribution plates. The plane of the air distribution plate is at an angle to the direction of the hot air inside the baking oven, and the air distribution plate is located between the left and right ventilation openings. The material hopper is located between the air distribution plates.
[0015] By adopting the above-mentioned further technical solution, the hot air entering the oven from the left or right vent can be evenly dispersed under the action of the air distribution plate before passing through the hopper. This avoids the hot air directly heating a certain part of the material in the hopper, so that all parts of the material can receive uniform heat.
[0016] Furthermore, limit plates are provided at both ends of the gate along the moving direction of the gate to prevent the gate from exceeding the predetermined moving range when moving.
[0017] Along the moving direction of the gate, the baking oven has grooves for the gate to slide, ensuring the stability of the gate during movement.
[0018] Furthermore, the hot air inside the baking oven can pass through the hopper to bake the material inside.
[0019] Furthermore, the left telescopic unit and the right telescopic unit are cylinders, hydraulic cylinders or electric cylinders, and are fixedly mounted on the baking oven.
[0020] Furthermore, the baking oven has a door on one side, which is hinged to the baking oven on one side and has a locking structure on the other side, making it convenient for workers to load and unload baking materials.
[0021] Furthermore, the baking machine also includes a dust collection box, which is connected to the left side of the baking oven and has an exhaust pipe above it, so that the dust and impurities in the waste heat gas discharged from the left side of the baking oven will remain in the dust collection box, preventing the impurities from being discharged into the atmosphere with the waste heat gas.
[0022] Furthermore, a baffle is provided on the side of the dust collection box near the baking oven. There is a channel between the lower part of the baffle and the bottom of the dust collection box. The exhaust pipe is located between the baffle and the side wall of the dust collection box away from the baking oven. Under the action of the baffle, the waste heat gas discharged from the baking oven can only flow through the channel between the lower part of the baffle and the bottom of the dust collection box. When the left vent is located above the baking oven, the waste heat gas discharged from the baking oven can only flow from the bottom of the dust collection box to the exhaust pipe above the dust collection box, and then be discharged from the baking oven. This makes it easier for dust and impurities to settle to the bottom of the dust collection box when the waste heat gas flows through it.
[0023] Furthermore, the fan, heating box, baking box, and dust collection box are all mounted on the frame, and the bottom of the frame is equipped with casters to facilitate the movement of the entire baking machine.
[0024] The beneficial effects of this utility model through the above technical solution are as follows:
[0025] 1. In this utility model, gates are provided on both the left and right sides of the baking oven, and the gates cover the openings on the left and right sides of the baking oven to form staggered left and right ventilation openings, respectively. By moving the gates up and down or forward and backward, the positions of the left and right ventilation openings on the baking oven can be changed, but the positions of the left and right ventilation openings are still staggered, so that hot air can be blown toward the material from different directions, thereby realizing the reversal of the baking air direction of the baking machine.
[0026] 2. In this utility model, the left telescopic unit and the right telescopic unit are respectively connected to the gate on the corresponding side and drive the gate to move in the up-down or back-forward direction. This allows the staggered arrangement of the left and right ventilation openings to be achieved simply by controlling the left and right telescopic units to be in different working states. When it is necessary to change the baking direction, it is only necessary to control the left and right telescopic units to change their working states at the same time, so that hot air can be blown towards the material from different directions, thereby realizing the reversal of the baking air direction.
[0027] 3. In this utility model, by setting up air distribution plates and placing the hopper between the air distribution plates, the hot air entering the oven from the left or right ventilation opening can be evenly dispersed under the action of the air distribution plates before passing through the hopper, thereby avoiding the hot air directly heating a part of the material in the hopper.
[0028] 4. In this utility model, by setting up the dust collection box and the baffle inside the dust collection box, the waste heat gas discharged from the baking oven can only flow through the channel between the bottom of the baffle and the bottom of the dust collection box, and then be discharged from the baking machine through the exhaust pipe above the dust collection box; this not only makes it easier for dust and impurities to settle to the bottom of the dust collection box when the waste heat gas flows through it. Attached Figure Description
[0029] Figure 1 This is one of the structural schematic diagrams of this utility model (front view);
[0030] Figure 2 This is the second structural schematic diagram of this utility model (rear view);
[0031] Figure 3 This is one of the structural schematic diagrams of the baking oven in this utility model (main view) (door hidden);
[0032] Figure 4 This is the second structural schematic diagram of the baking oven in this utility model (right side view) (door hidden);
[0033] Figure 5 This is the third schematic diagram of the baking oven in this utility model (left side view) (door hidden);
[0034] Figure 6 This is a schematic diagram of the structure of the hopper in this utility model;
[0035] Figure 7 This is a schematic diagram of the overall structure of the baking oven in this utility model (front view);
[0036] Figure 8 This is a schematic diagram of the dust collection box in this utility model.
[0037] The numbers in the attached diagram are as follows: 1 is the fan, 101 is the fan inlet, 2 is the heating box, 3 is the baking box, 301 is the door, 4 is the left telescopic unit, 5 is the right telescopic unit, 6 is the left ventilation opening, 7 is the right ventilation opening, 9 is the gate, 901 is the limit plate, 10 is the hopper, 1001 is the partition, 11 is the air distribution plate, 1101 is the upper air distribution plate, 1102 is the lower air distribution plate, 12 is the dust collection box, 1201 is the exhaust pipe, 1202 is the baffle, and 13 is the frame. Detailed Implementation
[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0039] like Figures 1-2As shown, a reversible baking machine includes a fan 1 and a heating box 2, and also includes a baking box 3 with openings on the left and right sides. The fan 1, the heating box 2 and the baking box 3 are connected sequentially from right to left, so that the air generated by the fan 1 can be heated when passing through the heating box 2, thus becoming hot air, and then enters the baking box 3 to bake the material in the baking box 3.
[0040] In this embodiment, heating is achieved by placing a heating rod inside the heating box 2 to heat the air generated by the fan 1; the fan 1 is equipped with fan blades, which are driven to rotate by a motor outside the fan 1 to generate air, and a fan inlet 101 is provided on one side of the fan 1.
[0041] like Figures 3-5 As shown, the baking oven 3 is provided with gates 9 on both the left and right sides. The gate 9 on the left side of the baking oven 3 moves up and down to cover the upper or lower part of the opening to form a left ventilation opening 6, and the gate 9 on the right side of the baking oven 3 moves up and down to cover the upper or lower part of the opening to form a right ventilation opening 7.
[0042] Alternatively, the gate 9 on the left side of the baking oven 3 can be moved back and forth to cover the front or rear of the opening to form a left ventilation opening 6, and the gate 9 on the right side of the baking oven 3 can be moved back and forth to cover the front or rear of the opening to form a right ventilation opening 7.
[0043] The left ventilation port 6 and the right ventilation port 7 are arranged in an alternating manner, so that by moving the gate 6, the hot air can be controlled to blow onto the material from different directions, thereby realizing the reversal of the baking air direction of the baking machine.
[0044] In this embodiment, when the gates 9 on the left and right sides of the baking oven 3 move up and down, the left ventilation port 6 and the right ventilation port 7 are respectively arranged at the lower left and upper right of the baking oven 3, or the upper left and lower right, so as to achieve the staggered arrangement of the positions of the left ventilation port 6 and the right ventilation port 7.
[0045] When the gates 9 on the left and right sides of the baking oven 3 move back and forth, the left ventilation port 6 and the right ventilation port 7 are respectively arranged in the front left and rear right of the baking oven 3, or the rear left and front right, so as to achieve the staggered arrangement of the left ventilation port 6 and the right ventilation port 7.
[0046] As one possible implementation, the baking oven 3 is provided with a left telescopic unit 4 and a right telescopic unit 5 on its left and right sides, respectively. The left telescopic unit 4 and the right telescopic unit 5 are respectively connected to the gate 9 on the corresponding side and drive the gate 9 to move in the up-down or back-forward direction. By driving the gate 9 to move through the left telescopic unit 4 and the right telescopic unit 5, the flow direction of hot air inside the baking oven 3 can be changed.
[0047] As one possible implementation, the left telescopic unit 4 and the right telescopic unit 5 are cylinders, hydraulic cylinders, or electric cylinders; and are fixedly mounted on the baking oven 3.
[0048] In this embodiment, the gate 9 is a non-ventilated ordinary plate. Both the left telescopic unit 4 and the right telescopic unit 5 are cylinders, and the cylinders drive the gate 9 to move up and down. The cylinder can be extended or retracted by connecting the cylinder and an external air source through an air pipe, thereby controlling the up and down movement of the gate 9. The cylinder is fixedly connected to the baking oven 3 through a support frame (the cylinder is fixedly mounted on the support frame, and the support frame is fixedly connected to the baking oven 3). The cylinder and the gate 9 are connected by a connecting rod. One end of the connecting rod is fixedly connected to the output end of the cylinder, and the other end is fixedly connected to the gate 9.
[0049] In this embodiment, when the cylinders of the left telescopic unit 4 and the right telescopic unit 5 are both in the initial state (retracted), the left vent 6 and the right vent 7 are both located below the baking oven 3. When the cylinders of the left telescopic unit 4 and the right telescopic unit 5 are both extended, the left vent 6 and the right vent 7 are both located above the baking oven 3.
[0050] In use, simply control the cylinders of the left telescopic unit 4 and the right telescopic unit 5 to be in different working states (left side extended, right side retracted) to achieve the alternating appearance of the left ventilation port 6 and the right ventilation port 7. When it is necessary to change the baking direction, simply control the cylinders of the left telescopic unit 4 and the right telescopic unit 5 to change their working states simultaneously (left side retracted, right side extended); thus, hot air can be blown towards the material from different directions, thereby realizing the reversal of the baking air direction.
[0051] As one possible implementation, the baking oven 3 is provided with a material hopper 10 and at least two air distribution plates 11 inside. The plane of the air distribution plate 11 is at an angle to the direction of the hot air inside the baking oven 3, and the air distribution plate 11 is located between the left ventilation port 6 and the right ventilation port 7. The material hopper 10 is located between two adjacent air distribution plates 11.
[0052] In this embodiment, the hopper 10 is used to hold the material to be baked, and the air distribution plate 11 is a common mesh plate. There are two air distribution plates 11, which are arranged vertically at intervals in the baking oven 3. They are the upper air distribution plate 1101 and the lower air distribution plate 1102. The hopper 10 is located between the upper air distribution plate 1101 and the lower air distribution plate 1102, so that the hot air entering the baking oven 3 from the right ventilation port 7 can be evenly dispersed under the action of the air distribution plate 10, and then pass through the hopper 10. This avoids the hot air directly heating a part of the material in the hopper 10. The hot air passing through the hopper 10 is dispersed under the action of the air distribution plate 11 and then discharged from the oven 1 through the left ventilation port 6, avoiding the hot air being concentratedly discharged from the baking oven 3 and causing uneven heat dissipation.
[0053] As one possible implementation method, such as Figure 6 As shown, the hot air inside the baking oven 3 can pass through the hopper 10.
[0054] Specifically, the upper end of the hopper 10 is open to facilitate the placement and removal of materials, and the lower end is a mesh plate to allow hot air to pass through the lower end of the hopper 10. The hopper 10 is also equipped with a partition 1001, which is perpendicular to the upper and lower ends of the hopper 10 to prevent the materials in the hopper 10 from being too concentrated and affecting the baking effect.
[0055] As one possible implementation, limiting plates 901 are provided at both ends of the gate 9 along the moving direction of the gate 9. The limiting plates 901 are ordinary plates used to limit the moving range of the gate 9.
[0056] Along the moving direction of the gate plate 9, the baking oven 3 has a groove for the gate plate 9 to slide, so as to ensure the stability of the gate plate 9 during the moving process.
[0057] As one possible implementation method, such as Figure 7 As shown, the baking oven 3 has a door 301 on one side. One side of the door 301 is hinged to the baking oven 3, and the other side has a locking structure for locking the door 301 when it is closed, so as to ensure the sealing and safety of the baking oven 3 during the baking process.
[0058] In this embodiment, a sealing strip is provided at the edge of the door 301, and the locking structure adopts a conventional oven door handle.
[0059] As one possible implementation method, such as Figures 1-2 and Figure 8 As shown, the baking machine also includes a dust collection box 12, which is connected to the left side of the baking box 3, and an exhaust pipe 1201 is provided above the dust collection box 12, so that the dust and impurities in the waste heat gas discharged from the left side of the baking box 3 will remain in the dust collection box 12, preventing the impurities from being discharged into the atmosphere with the waste heat gas.
[0060] As one possible implementation, a baffle 1202 is provided on the side of the dust collection box 12 near the baking oven 3. There is a channel between the lower part of the baffle 1202 and the bottom of the dust collection box 12. The exhaust pipe 1201 is located between the baffle 1202 and the side wall of the dust collection box 12 away from the baking oven 3. The upper part of the baffle 1202 is recessed and smoothly transitioned towards the side away from the baking oven 3, so that under the action of the baffle, the waste heat gas discharged from the baking oven 3 can only flow through the channel between the lower part of the baffle 1202 and the bottom of the dust collection box 12. When the left vent 6 is located above the baking oven 3, the waste heat gas discharged from the baking oven 3 can only flow from the bottom of the dust collection box 12 to the exhaust pipe 1201 above the dust collection box 12, and then be discharged from the baking oven. This makes it easier for dust and impurities to settle to the bottom of the dust collection box 12 when the waste heat gas flows through it.
[0061] In this embodiment, a dust collection box 12 is provided with a dust collection box door on one side. The dust collection box door can be disassembled relative to the dust collection box 12 by means of a fastening structure, which facilitates the cleaning of dust and impurities settled in the dust collection box 12. The fastening structure is a bolt, and a handwheel is provided at one end of the screw for easy disassembly.
[0062] In one possible implementation, the fan 1, heating box 2, baking box 3 and dust collection box 12 are all mounted on the frame 13, and the bottom of the frame 13 is provided with casters to facilitate the movement of the entire baking machine.
[0063] In this utility model, when in use:
[0064] The heating rods inside the heating chamber 2 are activated to begin heating. Once the appropriate temperature is reached, the door 301 is opened, and the hopper 10 containing the material to be baked is placed inside the baking chamber 3. The door 301 is then closed and locked using the oven door handle. Depending on the baking requirements (baking from bottom to top or top to bottom), if baking is from bottom to top, the right telescopic unit 5 (cylinder) is retracted, causing the gate 9 on the right side of the baking chamber 3 to move upward. The left telescopic unit 4 (cylinder) is extended, causing the gate 9 on the left side of the baking chamber 3 to move downward. At this time, the right vent 7 and the left vent 6 are located at the lower right and upper left of the baking chamber 3, respectively. The motor is then started to drive... The fan blades inside the blower 1 rotate to generate air. The air is heated by the heating box 2, and the hot air enters from the right side of the baking box 3. The hot air flows into the baking box 3 through the right ventilation port 7 at the lower right of the baking box 3, and is dispersed by the lower air distribution plate 1102. It flows from the bottom of the hopper 10 to the top of the hopper 10, and then flows out of the baking box 3 through the left ventilation port 6 at the upper left of the baking box 3, and enters the dust collection box 12. Under the action of the baffle 1202, the waste heat gas flows from the bottom of the dust collection box 12 to the exhaust pipe 1201 at the top of the dust collection box 12, and is discharged from the baking machine. Some impurities and dust in the waste heat gas will fall to the bottom of the dust collection box 12.
[0065] When the baking direction needs to be changed to top-to-bottom baking, the right telescopic unit 5 (cylinder) extends, causing the gate 9 on the right side of the baking oven 3 to move downwards. The left telescopic unit 4 (cylinder) retracts, causing the gate 9 on the left side of the baking oven 3 to move upwards. At this time, the right vent 7 and the left vent 6 are located at the upper right and lower left of the baking oven 3, respectively. Hot air entering from the right side of the baking oven 3 flows into the interior of the baking oven 3 through the right vent 7 at the upper right, and is evenly distributed in the upper part. Under the action of the air deflector 1101, the material is dispersed and flows from the top of the hopper 10 to the bottom of the hopper 10. Then it flows out of the baking oven 3 through the left ventilation port 6 at the lower left of the baking oven 3 and enters the dust collection box 12. Under the action of the baffle 1202, the waste heat gas will flow from the bottom of the dust collection box 12 to the exhaust pipe 1201 at the top of the dust collection box 12 and be discharged from the baking machine. Some impurities and dust in the waste heat gas will fall to the bottom of the dust collection box 12, thus realizing the reversal baking of the material in the hopper 10.
[0066] After baking, turn off the heating rods and fan 1 in the heating box 2, and then remove the material from the hopper 10.
[0067] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0068] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Any equivalent or equivalent modifications or substitutions to the technical solutions of the present invention without departing from the spirit of the present invention or the scope of disclosure shall fall within the protection scope of the present invention.
Claims
1. A reversible baking machine, comprising a fan (1) and a heating chamber (2), characterized in that, It also includes a baking oven (3) with openings on the left and right sides, wherein the fan (1), heating box (2) and baking oven (3) are connected sequentially from right to left; The baking oven (3) is provided with gates (9) on both the left and right sides. The gate (9) on the left side of the baking oven (3) moves up and down to cover the upper or lower part of the opening to form a left ventilation opening (6), and the gate (9) on the right side of the baking oven (3) moves up and down to cover the upper or lower part of the opening to form a right ventilation opening (7). Alternatively, the gate (9) on the left side of the oven (3) can move back and forth to cover the front or rear of the opening to form a left ventilation opening (6), and the gate (9) on the right side of the oven (3) can move back and forth to cover the front or rear of the opening to form a right ventilation opening (7). The left ventilation opening (6) and the right ventilation opening (7) are arranged in an alternating manner.
2. The reversing baking machine according to claim 1, characterized in that, The baking oven (3) is equipped with a hopper (10) and at least two air distribution plates (11). The plane of the air distribution plate (11) is at an angle to the direction of the hot air in the baking oven (3), and the air distribution plate (11) is located between the left ventilation port (6) and the right ventilation port (7). The hopper (10) is located between the air distribution plates (11).
3. The reversing baking machine according to claim 1, characterized in that, The baking oven (3) is provided with a left telescopic unit (4) and a right telescopic unit (5) on its left and right sides respectively. The left telescopic unit (4) and the right telescopic unit (5) are connected to the gate (9) on the corresponding side respectively, and drive the gate (9) to move in the up and down direction or the front and back direction.
4. The reversing baking machine according to claim 3, characterized in that, The baking oven (3) is equipped with a hopper (10) and at least two air distribution plates (11). The plane of the air distribution plate (11) is at an angle to the direction of the hot air in the baking oven (3), and the air distribution plate (11) is located between the left ventilation port (6) and the right ventilation port (7). The hopper (10) is located between the air distribution plates (11).
5. The reversing baking machine according to any one of claims 1 to 4, characterized in that, Limiting plates (901) are provided at both ends of the gate (9) along the moving direction of the gate (9); Along the moving direction of the gate (9), the baking oven (3) has a groove for the gate (9) to slide.
6. The reversing baking machine according to claim 3 or 4, characterized in that, The left telescopic unit (4) and the right telescopic unit (5) are cylinders, hydraulic cylinders or electric cylinders, and are fixedly mounted on the baking oven (3).
7. The reversing baking machine according to any one of claims 1 to 4, characterized in that, The baking oven (3) has a door (301) on one side, which is hinged to the baking oven (3) on one side and has a locking structure on the other side.
8. The reversing baking machine according to any one of claims 1 to 4, characterized in that, The baking machine also includes a dust collection box (12), which is connected to the left side of the baking box (3), and an exhaust pipe (1201) is provided above the dust collection box (12).
9. The reversing baking machine according to claim 8, characterized in that, The dust collection box (12) is provided with a baffle (1202) on the side near the baking oven (3). There is a channel between the bottom of the baffle (1202) and the bottom of the dust collection box (12). The exhaust pipe (1201) is located between the baffle (1202) and the side wall of the dust collection box (12) away from the baking oven (3).
10. The reversing baking machine according to claim 8, characterized in that, The fan (1), heating box (2), baking box (3) and dust collection box (12) are all mounted on the frame (13), and the bottom of the frame (13) is provided with rollers.