Three-layer hopper structure

Abstract

The utility model provides a three-layer hopper structure. The three-layer hopper structure comprises a support; the materials are conveyed into a plurality of first hopper assemblies; the second hopper assemblies are all arranged on the support, the second hopper assemblies are located below the corresponding first hopper assemblies, and the second hopper assemblies are used for weighing materials; the third hopper assemblies are arranged on the support and located below the corresponding second hopper assemblies, and after the second hopper assemblies complete weighing, the materials are stored in the third hopper assemblies. By additionally arranging the second hopper assembly, materials can be conveyed into the first hopper assembly in advance, before discharging is needed, the materials can be conveyed into the second hopper assembly through the first hopper assembly in advance, and the materials are conveyed into the third hopper assembly to be stored after being weighed by the second hopper according to the needed mass; and the materials are directly output through the third material assembly, so that the weighing speed is increased, and the time for supplementing the materials is shortened.

Description

Technical Field

[0001] This application relates to a hopper structure, and more particularly to a three-layer hopper structure. Background Technology

[0002] When weighing and packaging sticky and moist materials such as pickled vegetables, bamboo shoots, spicy puffed snacks, dried small fish, and kelp strips, it is necessary to use a scale for weighing. However, existing scales often encounter situations where the material gets stuck or sticks to the online vibrating plate, resulting in reduced weighing efficiency. Consequently, when the packaging bag arrives at the discharge port, the material has not yet been discharged, which seriously affects the packaging efficiency. Utility Model Content

[0003] This application provides a three-layer hopper structure to solve the problems existing in related technologies. The technical solution is as follows:

[0004] This application provides a three-layer hopper structure, including:

[0005] support;

[0006] Several first hopper assemblies are arranged in a ring on a support, and materials are conveyed into the several first hopper assemblies;

[0007] Several second hopper assemblies are mounted on a support, with each second hopper assembly located below a corresponding first hopper assembly. The second hopper assemblies weigh the material.

[0008] Several third hopper assemblies are mounted on a support frame. The third hopper assemblies are located below the corresponding second hopper assemblies. After the second hopper assemblies have finished weighing, the material is stored in the third hopper assemblies.

[0009] In one implementation, it further includes:

[0010] The feeding assembly is mounted on the support and corresponds to the discharge end of the unloading equipment.

[0011] The material discharge channel is located on the support frame, below the third hopper, and above the hopper.

[0012] In one implementation,

[0013] The first hopper assembly includes:

[0014] The first connecting frame, one end of which is mounted on the bracket;

[0015] The first hopper is located at the end of the first connecting frame away from the support.

[0016] The first transmission component, one end of which is disposed on the first connecting frame;

[0017] The first connecting member is disposed at the end of the first transmission member away from the first connecting frame;

[0018] The first stop block is disposed on the first hopper, and the end of the first connecting member away from the first transmission member is disposed on the first stop block. The first stop block is provided at one end of the first hopper and has teeth.

[0019] The second stop is set on the first hopper and also has teeth that mesh with the teeth on the first stop.

[0020] The first spring has one end mounted on the first transmission member and the other end mounted on the first connecting frame.

[0021] The first drive assembly is mounted on the bracket and drives the first transmission component to rotate around the connection point between the first transmission component and the first connecting frame.

[0022] In one implementation,

[0023] The first driving component includes:

[0024] A connecting rod is mounted on the first connector.

[0025] A rotating rod is mounted on the output end of the motor.

[0026] The adjusting roller is located at the end of the rotating rod away from the motor. When the adjusting roller contacts the connecting rod, it presses down on the connecting rod.

[0027] In one implementation,

[0028] The structure of the second hopper assembly is the same as that of the first hopper assembly. The difference is that the size of the second hopper in the second hopper assembly is larger than that of the first hopper, and the second hopper also has a weighing component.

[0029] In one implementation,

[0030] The third hopper assembly includes:

[0031] The second connecting frame has one end mounted on the bracket.

[0032] The third hopper is located at the end of the second connecting frame away from the support.

[0033] The second transmission component is rotatably mounted on the second connecting frame.

[0034] The second connector has one end disposed on the second transmission component;

[0035] The third stop block has one end rotatably mounted on the third hopper and has teeth on one end of the third hopper. The end of the second connecting member away from the second transmission member is mounted on the third stop block.

[0036] The fourth stop block has one end rotatably mounted on the third hopper. The fourth stop block has teeth on one end of the third hopper, and the teeth on the fourth stop block mesh with the teeth on the third stop block.

[0037] The movable rod is located on the end of the second transmission component away from the second connecting component;

[0038] The second spring has one end mounted on the second connecting frame and the other end mounted on the movable rod.

[0039] The second drive assembly is mounted on the bracket and drives the second transmission component to rotate about the connection point between the second transmission component and the second connecting frame as the axis.

[0040] A crossbar is mounted on the second transmission component.

[0041] In one implementation,

[0042] The second connecting frame has a slide groove for the movable rod to move through, and the movable rod extends through the slide groove to the outside of the second connecting frame.

[0043] In one implementation,

[0044] The second drive component has the same structure as the first drive component.

[0045] In one implementation,

[0046] The feeding assembly includes:

[0047] The first spiral feeder is mounted on the support and located at the discharge port of the feeding device. One end of the first spiral feeder is located on the support, and the other end extends to the first hopper.

[0048] The second spiral feeder is mounted on the support and is located above the first spiral feeder.

[0049] In one implementation,

[0050] The length of the first spiral feeder is greater than the length of the second spiral feeder.

[0051] The advantages or beneficial effects of the above technical solutions include at least the following:

[0052] By adding a second hopper assembly, materials can be pre-loaded into the first hopper assembly. Before feeding, materials can be pre-loaded into the second hopper assembly via the first hopper assembly. After weighing according to the required mass, the second hopper assembly delivers the materials to the third hopper assembly for storage. When batching is required, the materials are directly output through the third hopper assembly, thereby improving the weighing speed and reducing the time for replenishing materials.

[0053] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0054] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0055] Figure 1 This is a schematic diagram of the structure of this utility model;

[0056] Figure 2 for Figure 1 A schematic diagram of the structure for dismantling the material unloading channel;

[0057] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0058] Figure 4 for Figure 1 Schematic diagram of the middle hopper assembly;

[0059] Figure 5 for Figure 2 A schematic diagram of the structure of the first hopper assembly;

[0060] Figure 6 for Figure 2 Schematic diagram of the structure of the third hopper assembly;

[0061] In the picture:

[0062] 100. Hopper structure;

[0063] 110. Bracket;

[0064] 120. First hopper assembly; 121. First connecting frame; 122. First hopper; 123. First transmission component; 124. First connecting component; 125. First stop block; 126. Second stop block; 127. First spring;

[0065] 128. First drive assembly; 1281. Connecting rod; 1282. Rotating rod; 1283. Adjusting roller;

[0066] 130. Second hopper assembly; 131. Second hopper; 132. Weighing assembly;

[0067] 140. Third hopper assembly; 141. Second connecting frame; 1411. Slide groove; 142. Third hopper; 143. Second transmission component; 144. Second connecting component; 145. Third stop block; 146. Fourth stop block; 147. Movable rod; 148. Second spring; 149. Second drive assembly;

[0068] 150. Feeding assembly; 151. First spiral feeder; 152. Second spiral feeder;

[0069] 160. Material drop channel; 161. Crossbar. Detailed Implementation

[0070] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0071] Figures 1-6 This diagram illustrates a structural diagram of a three-layer hopper structure 100 according to an embodiment of this application. Figures 1-6 As shown, the hopper structure 100 may include:

[0072] Bracket 110;

[0073] A plurality of first hopper assemblies 120 are arranged in a ring around the support 110, and materials are conveyed into the plurality of first hopper assemblies 120;

[0074] A plurality of second hopper assemblies 130 are mounted on a support 110. Each second hopper assembly 130 is located below a corresponding first hopper assembly 120. The second hopper assembly 130 weighs the material.

[0075] Several third hopper components 140 are mounted on the support 110. The third hopper components 140 are located below the corresponding second hopper components 130. After the second hopper components 130 have finished weighing, the material is stored in the third hopper components 140.

[0076] In this embodiment, the material is conveyed into the first hopper assembly 120 and pre-stored in the first hopper assembly 120. When material needs to be discharged, the first hopper assembly 120 is opened, and the material falls into the second hopper assembly 130 under the action of gravity. The material is weighed in the second hopper assembly 130 as needed. When the required amount of material is reached, the first hopper assembly 120 is closed. After the first hopper assembly 120 is closed, the second hopper assembly 130 is opened, and the weighed material falls into the third hopper assembly 140 and is stored in the third hopper assembly 140. When needed, the third hopper assembly 140 is opened, and the required weighed material is conveyed to the corresponding hopper through the discharge channel 160.

[0077] By adding a second hopper assembly 130, materials can be pre-transported to the first hopper assembly 120. Before feeding, materials can be pre-transported from the first hopper assembly 120 to the second hopper assembly 130. After the second hopper 131 weighs the materials according to the required mass, the materials are transported to the third hopper assembly 140 for storage. When batching is required, the materials are directly output through the third material assembly, thereby improving the weighing speed and reducing the time for replenishing materials.

[0078] like Figures 1-2 As shown, in one embodiment, it further includes:

[0079] The feeding assembly 150 is mounted on the bracket 110 and corresponds to the discharge end of the unloading device.

[0080] The material discharge channel 160 is set on the support 110, below the third hopper 142, and above the hopper.

[0081] In this embodiment, the feeding device conveys the material to the feeding assembly 150, and the viscous material is conveyed into the first hopper assembly 120 by the screw conveyor of the feeding assembly 150, thereby avoiding blockage of the first hopper assembly 120.

[0082] The weighed material is stored in the third hopper assembly 140. When needed, the third hopper assembly 140 is opened so that the weighed material is transported to the corresponding hopper through the material drop channel 160, which facilitates the material being transported into the hopper.

[0083] like Figures 2-5 As shown, in one embodiment,

[0084] The first hopper assembly 120 includes:

[0085] The first connecting frame 121 has one end mounted on the bracket 110;

[0086] The first hopper 122 is located on the end of the first connecting frame 121 away from the support 110;

[0087] The first transmission component 123 has one end disposed on the first connecting frame 121;

[0088] The first connector 124 is disposed at the end of the first transmission member 123 away from the first connecting frame 121;

[0089] The first stop 125 is disposed on the first hopper 122. The end of the first connecting member 124 away from the first transmission member 123 is disposed on the first stop 125. The first stop 125 is provided on the end of the first hopper 122 and has teeth.

[0090] The second stop 126 is disposed on the first hopper 122. The second stop 126 also has teeth, and the teeth on the second stop 126 mesh with the teeth on the first stop 125.

[0091] The first spring 127 has one end disposed on the first transmission member 123 and the other end disposed on the first connecting frame 121;

[0092] The first drive assembly 128 is mounted on the bracket 110. The first drive assembly 128 drives the first transmission member 123 to rotate around the connection point between the first transmission member 123 and the first connecting frame 121.

[0093] In this embodiment, two first connecting frames 121 are provided, and the two first connecting frames 121 are symmetrical about the first hopper 122. One end of the first transmission member 123 is rotatably mounted on one of the connecting frames, and the first transmission member 123 is located on one side of one of the first connecting frames 121. The first transmission member 123 is provided with a connecting rod 1281, one end of which extends to the other first connecting frame 121 and is provided with a corresponding movable block. When the first drive assembly 128 is activated, the first drive assembly 128 moves the connecting rod 1281, thereby causing the first transmission member 123 to move. 23 rotates around the connection point of the first transmission component 123, thereby moving the first transmission component 123 and controlling the first stop block 125 to rotate around the connection point of the first hopper 122. Under the action of the meshing of the teeth on the first stop block 125 and the second stop block 126, the first stop block 125 and the second stop block 126 move simultaneously, thereby opening the first hopper 122. Through the setting of the first spring 127, when the first drive assembly 128 is not in contact with the connecting rod 1281, the first spring 127 pulls the first transmission component 123, thereby resetting the first stop block 125 and the second stop block 126.

[0094] Furthermore, two first transmission components 123 may be provided to facilitate the normal movement of the connecting rod 1281 when the first drive assembly 128 applies pressure to the connecting rod 1281;

[0095] Furthermore, the side view of the first connecting frame 121 has an "n" shaped structure, the first connecting member 124 is set on the vertical bar of the first connecting frame 121 away from the first hopper 122, and the connecting rod 1281 is located below the crossbeam of the first connecting frame 121.

[0096] The material is conveyed into the first hopper 122 through the feeding assembly 150.

[0097] like Figures 2-5 As shown, in one embodiment,

[0098] The first drive component 128 includes:

[0099] Connecting rod 1281 is disposed on first connector 124;

[0100] Rotating rod 1282 is mounted on the output end of the motor;

[0101] Adjusting roller 1283 is located on the end of rotating rod 1282 away from the motor. When adjusting roller 1283 contacts connecting rod 1281, adjusting roller 1283 presses down connecting rod 1281.

[0102] In this embodiment, the two first transmission components 123 on the two first connecting frames 121 are connected by the connecting rod 1281. When the motor rotates, it drives the rotating rod 1282 to rotate, thereby causing the adjusting roller 1283 to rotate. During the rotation of the adjusting roller 1283, it contacts the connecting rod 1281 for part of the time, and then the adjusting roller 1283 presses down on the connecting rod 1281, thereby driving the rotation of the first transmission component 123.

[0103] Furthermore, the rotating rod 1282 rotates around the output end of the motor, thereby forming a circular path of the adjusting roller 1283 with the output end of the motor as the center. Part of the circular path passes through the connecting rod 1281. When the adjusting roller 1283 moves to the connecting rod 1281, it exerts downward pressure on the connecting rod 1281, thereby causing the connecting rod 1281 to drive the first transmission component 123 to rotate.

[0104] like Figure 4 As shown, in one embodiment,

[0105] The structure of the second hopper assembly 130 is the same as that of the first hopper assembly 120. The difference is that the size of the second hopper 131 in the second hopper assembly 130 is larger than that of the first hopper 122, and the second hopper 131 also has a weighing component 132.

[0106] In this embodiment, the structure of the second hopper assembly 130 is the same as that of the first hopper assembly 120. The difference is that the size of the second hopper 131 in the second hopper assembly 130 is larger than that of the first hopper 122, which facilitates the first hopper 122 to discharge materials. At the same time, by setting a weighing component 132 in the second hopper 131, it is convenient to weigh the materials.

[0107] Furthermore, the load-bearing component inside the second hopper 131 is a weighing sensor, which is installed on the stop block of the second hopper 131. The transmission block on the second hopper 131 is installed on the inner side of the connecting frame, and the spring is installed on the outer side of the connecting frame. The transmission block is provided with a protruding end for the spring to connect to.

[0108] like Figures 2-6 As shown, in one embodiment,

[0109] The third hopper assembly 140 includes:

[0110] The second connecting frame 141 has one end mounted on the bracket 110;

[0111] The third hopper 142 is located on the end of the second connecting frame 141 away from the support 110;

[0112] The second transmission component 143 is rotatably mounted on the second connecting frame 141;

[0113] The second connector 144 has one end disposed on the second transmission member 143;

[0114] The third stop 145, one end of the third stop 145 is rotatably mounted on the third hopper 142, the third stop 145 is provided on one end of the third hopper 142 and has teeth, and the end of the second connecting member 144 away from the second transmission member 143 is provided on the third stop 145.

[0115] The fourth stop 146 is rotatably mounted on the third hopper 142. The fourth stop 146 has teeth on one end of the third hopper 142. The teeth on the fourth stop 146 mesh with the teeth on the third stop 145.

[0116] Movable rod 147 is disposed on the end of the second transmission member 143 away from the second connecting member 144;

[0117] The second spring 148 has one end mounted on the second connecting frame 141 and the other end mounted on the movable rod 147.

[0118] The second drive assembly 149 is mounted on the bracket 110. The second drive assembly 149 drives the second transmission member 143 to rotate around the connection point between the second transmission member 143 and the second connecting frame 141.

[0119] A crossbar 161 is mounted on the second transmission component 143.

[0120] In this embodiment, there are two second connecting frames 141, which are symmetrically arranged on the third hopper 142. There are two second transmission members 143, which are respectively arranged inside the second connecting frames 141. A crossbar 161 is provided between the two second transmission members 143. One of the second transmission members 143 is connected to the second connecting member 144, and the second connecting member 144 is connected to the third stop 145. The third stop 145 and the fourth stop 146 have the same structure. By rotating the second drive assembly 149, the crossbar 161 is pressed down, so that the second transmission member 143 rotates about the connection point of the second connecting frame 141 as the axis, thereby driving the third stop 145 and the fourth stop 146 to control the closing of the third hopper 142.

[0121] With the arrangement of the first hopper 122, the second hopper 131 and the third hopper 142, viscous materials are pre-stored in the first hopper 122 and then conveyed to the second hopper 131 for weighing. The first hopper 122 conveys a certain mass of material into the second hopper 131 according to the required mass. After the second hopper 131 collects enough material, it is conveyed to the third hopper 142 for storage. When needed, the third hopper 142 is opened to convey the material into the double-headed hopper, thereby improving the feeding speed.

[0122] Furthermore, the second connecting frame 141 has a slide groove 1411 for the movable rod 147 to move through. The movable rod 147 extends through the slide groove 1411 to the outside of the second connecting frame 141. One end of the second spring 148 is disposed on the movable rod 147, and the other end is disposed on the second connecting frame 141. When the second drive assembly 149 presses down on the crossbar 161, the second transmission member 143 drives the movable rod 147 to move, thereby causing the second spring 148 to relax. When the second drive assembly 149 is not in contact with the crossbar 161, the second spring 148 contracts and resets, thereby causing the third stop 145 and the fourth stop 146 to close.

[0123] It should be noted that the second drive assembly 149 has the same structure as the first drive assembly 128. When the third stop 145 and the fourth stop 146 need to be closed or opened, it is only necessary to control the adjusting roller 1283 on the second drive assembly 149 to contact the crossbar 161.

[0124] like Figure 4 As shown, in one embodiment,

[0125] The feed assembly 150 includes:

[0126] The first spiral feeder 151 is mounted on the support 110 and located at the discharge port of the feeding device. One end of the first spiral feeder 151 is located on the support 110, and the other end extends to the first hopper 122.

[0127] The second spiral feeder 152 is mounted on the bracket 110 and is located above the first spiral feeder 151.

[0128] In this embodiment, the first spiral feeder 151 is driven by a motor, which is mounted on the bracket 110. The first spiral feeder 151 is a threaded rotating rod that rotates and conveys viscous materials. The second spiral feeder 152 is also driven by a motor, which is also mounted on the bracket 110. The second spiral feeder 152 is also a threaded rotating rod, but its length is shorter than that of the first spiral feeder 151. The second spiral feeder 152 conveys viscous materials from the feeding assembly to the first spiral feeder 151. When there is too much material at the first spiral feeder 151, the rotation direction of the second spiral feeder 152 can be set to be opposite to that of the first spiral feeder 151 to control the amount of material at the first spiral feeder 151.

[0129] The functions of each module in each device of this utility model embodiment can be found in the corresponding description in the above method, and will not be repeated here.

[0130] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0131] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0132] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A three-layer hopper structure, characterized in that, include: support; A plurality of first hopper assemblies are arranged in a ring around the support, and materials are conveyed into the plurality of first hopper assemblies; A plurality of second hopper assemblies are disposed on the support, and the second hopper assemblies are located below the corresponding first hopper assemblies. The second hopper assemblies weigh the materials. A plurality of third hopper assemblies are provided on the support, and the third hopper assemblies are located below the corresponding second hopper assemblies. After the second hopper assembly has finished weighing, the material is stored in the third hopper assembly.

2. The three-layer hopper structure according to claim 1, characterized in that, Also includes: A feeding assembly is mounted on the support and corresponds to the discharge end of the unloading device; The material discharge channel is located on the support, below the third hopper, and above the hopper.

3. The three-layer hopper structure according to claim 2, characterized in that, The first hopper assembly includes: A first connecting frame, one end of which is disposed on the bracket; The first hopper is disposed at the end of the first connecting frame away from the support; A first transmission component, one end of which is disposed on the first connecting frame; A first connecting member is disposed at the end of the first transmission member away from the first connecting frame; A first stop block is disposed on the first hopper, and the end of the first connecting member away from the first transmission member is disposed on the first stop block. The first stop block is provided with teeth on one end of the first hopper. The second stop is disposed on the first hopper and also has teeth, which mesh with the teeth on the first stop. A first spring, one end of which is disposed on the first transmission member and the other end of which is disposed on the first connecting frame; A first drive assembly is disposed on the bracket and drives the first transmission member to rotate about the connection point between the first transmission member and the first connecting frame.

4. The three-layer hopper structure according to claim 3, characterized in that, The first driving component includes: A connecting rod, wherein the connecting rod is disposed on the first connecting member; A rotating rod, which is mounted on the output end of the motor; An adjusting roller is disposed on the end of the rotating rod away from the motor. When the adjusting roller contacts the connecting rod, the adjusting roller presses down on the connecting rod.

5. A three-layer hopper structure according to claim 4, characterized in that, The structure of the second hopper assembly is the same as that of the first hopper assembly, except that the size of the second hopper in the second hopper assembly is larger than that of the first hopper, and the second hopper also has a weighing component.

6. The three-layer hopper structure according to claim 4, characterized in that, The third hopper assembly includes: A second connecting frame, one end of which is disposed on the bracket; The third hopper is disposed at the end of the second connecting frame away from the support; The second transmission component is rotatably mounted on the second connecting frame; The second connector has one end disposed on the second transmission component; The third stop block, one end of which is rotatably mounted on the third hopper, has teeth on one end of the third hopper, and the end of the second connecting member away from the second transmission member is mounted on the third stop block; The fourth stop block has one end rotatably mounted on the third hopper, and the fourth stop block has teeth on one end of the third hopper, the teeth on the fourth stop block meshing with the teeth on the third stop block; A movable rod is disposed on the end of the second transmission member away from the second connecting member; The second spring, one end of which is disposed on the second connecting frame and the other end of which is disposed on the movable rod; The second drive assembly is disposed on the bracket and drives the second transmission member to rotate about the connection point between the second transmission member and the second connecting frame as the axis. A crossbar is mounted on the second transmission component.

7. A three-layer hopper structure according to claim 6, characterized in that, The second connecting frame has a slide groove for the movable rod to move through, and the movable rod extends through the slide groove to the outside of the second connecting frame.

8. A three-layer hopper structure according to claim 6, characterized in that, The second driving component has the same structure as the first driving component.

9. A three-layer hopper structure according to claim 3, characterized in that, The feeding assembly includes: The first spiral feeder is mounted on the support and located at the discharge port of the feeding device. One end of the first spiral feeder is located on the support, and the other end extends to the first hopper. The second spiral feeder is disposed on the bracket and is located above the first spiral feeder.

10. A three-layer hopper structure according to claim 9, characterized in that, The length of the first spiral feeder is greater than the length of the second spiral feeder.

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