Plate feeding transfer frame

Abstract

The utility model relates to the technical field of plate feeding and transferring devices, and provides a plate feeding and transferring frame which comprises a plate stacking frame, a plate supporting assembly and a limiting assembly, the limiting assembly comprises a pressing plate, the top of a plate placed on the inner side of the plate stacking frame is pressed against and limited through the pressing plate, and an overturning frame is arranged on the rear side of the plate stacking frame. An electric telescopic rod is installed on the overturning frame, and the plates located on the top of the inner side of the plate stacking frame are pushed away through the electric telescopic rod. When to-be-fed plates are manually or hoisted and stacked at the upper ends of the lifting plates on the inner side of the plate stacking frame, the lifting plates can slide down along the outer walls of the guide shafts and compress the supporting springs. And after the plate located at the top is pushed out by the electric telescopic rod, the lifting plate is automatically lifted under the action of the supporting spring, so that the plate located at the secondary top moves upwards by one station for the electric telescopic rod to carry out next-time pushing-away work, the operation is simple, the use is convenient, and the manufacturing and use cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of plate material loading and transferring devices, and specifically relates to a plate material loading and transferring rack. Background Art

[0002] Plates are flat rectangular building material boards made into standard sizes and are used in the construction industry as components of walls, ceilings or floors. They also refer to metal plates made by forging, rolling or casting. They are divided into thin plates, medium plates, thick plates, and extra-thick plates, which are usually made into flat rectangular building material boards of standard sizes. When using plates, they need to be processed, such as cutting, grinding, etc. When processing plates, they need to be transported to the processing location.

[0003] After searching, the existing patent (Announcement No.: CN220885850U) discloses a plate feeding device, wherein the feeding platform is connected to the plate lifting assembly and the push plate lifting assembly, and the push plate lifting assembly is connected to the push plate assembly; the push plate lifting assembly includes a push plate lifting electric push rod, and the push plate lifting electric push rod is connected to the middle of one end of the feeding platform, and the push rod of the push plate lifting electric push rod is connected to the guide plate; the push plate assembly includes a push plate electric push rod, and the middle of one side of the guide plate is connected to the push plate electric push rod. This plate feeding device realizes the movement of the plate along the height direction with the same plate thickness, so that the push plate pushes the plate one by one to the processing position to realize the loading.

[0004] However, there are still some shortcomings in the above scheme: it is driven by a motor, and driven by a synchronous belt and a synchronous wheel to realize the simultaneous rotation of four screws, so as to facilitate the synchronous movement of four sliders, thereby realizing the lifting and lowering of the support plate. The structure of the entire lifting mechanism is relatively complicated, and the motor drive cannot realize the automatic lifting and lowering of the plate during loading. The operation is relatively troublesome and the production cost is high. In addition, it adopts four-way synchronous wheels and synchronous belts for transmission. Since the wrap angle between the synchronous wheels and the synchronous belts is less than 120°, after a long period of work, the synchronous belts will have the risk of deviation or even falling off during work, and the stability is insufficient.

[0005] In view of this, the utility model proposes a plate loading and transferring rack. Utility Model Content

[0006] The utility model provides a plate loading and transfer rack, which solves the problems in the related art that the existing plate loading device has a complex structure, insufficient stability, cannot realize automatic lifting of the plate during loading, is relatively troublesome to operate, and has high manufacturing cost.

[0007] The technical scheme of the utility model is as follows: a plate loading and transferring rack, comprising: a plate stacking frame and four brake wheels rotatably connected to the four corners of the bottom of the plate stacking frame, a support plate assembly is arranged inside the plate stacking frame, which is used to support the plates placed inside the plate stacking frame, and limiting assemblies are arranged on both sides of the top of the plate stacking frame, the limiting assembly comprises a pressing plate, through which the top of the plate placed inside the plate stacking frame is resisted and limited, and a fixing assembly is arranged between the pressing plate and the plate stacking frame, which is used to constrain and fix the pressing plate;

[0008] A turning frame is arranged at the rear side of the plate stacking frame, and an electric telescopic rod is installed on the turning frame, through which the plate at the top of the plate stacking frame is pushed away, and a height adjustment component is arranged on the turning frame for adjusting the working height of the electric telescopic rod;

[0009] A guide and positioning assembly is provided at the front side of the plate stacking frame. When the electric telescopic rod pushes away the plate at the top, the guide and positioning assembly is used to guide the plate at the top and constrain and limit the remaining plates.

[0010] Preferably, two T-shaped guide cavities are provided on the opposite inner walls of the plate stacking frame, and the support plate assembly includes a lifting plate slidably mounted on the inner side of the plate stacking frame for stacking plates, and the lifting plate extends to the inner side of the T-shaped guide cavity and is slidably connected thereto.

[0011] Preferably, a guide shaft is fixedly connected to the inner side of each T-shaped guide cavity, and the guide shaft slides through the interior of the lifting plate. A support spring is sleeved on the outer wall of the guide shaft, and both ends of the support spring are respectively fixedly connected to the lower end wall of the lifting plate and the bottom of the T-shaped guide cavity.

[0012] Preferably, the limiting assembly further comprises ball sleeves evenly distributed at the bottom of the pressure plate, and each of the ball sleeves has a rotating sleeve provided therein with a rotating ball.

[0013] Preferably, the guiding and positioning assembly includes an inner plate fixedly connected to the bottom of the plate stacking frame, a lifting frame is provided on the outer sliding sleeve of the inner plate, a roller is rotatably connected to the top of the lifting frame, a threaded seat is fixedly connected to the outer wall of the lifting frame, a turntable is rotatably connected to the bottom of the plate stacking frame, a screw is fixedly connected to the top of the turntable, and the screw passes through the interior of the threaded seat and is threadedly connected thereto.

[0014] Preferably, the fixing assembly includes a connecting plate rotatably connected to the top of the sheet stacking frame, the connecting plate is fixedly connected to the outer wall of the pressure plate, a second bracket is fixedly connected to the upper end of the connecting plate, a first bracket is fixedly connected to the top of the sheet stacking frame, an insertion rod is commonly connected between the first bracket and the second bracket, and one end of the insertion rod is fixedly connected to a rotating head, the insertion rod and the second bracket are slidingly connected, a threaded section is provided on the side of the insertion rod close to the rotating head, and the threaded section is threadedly connected to the first bracket.

[0015] Preferably, the flip frame includes two right-angle plates fixed to the side walls of the plate stacking frame by bolts, the outer walls of the two right-angle plates are connected to the right-angle frames, one of the right-angle plates is rotatably connected to the right-angle frame by a rotating shaft, and the other right-angle plate is fixed to the right-angle frame by bolts, and an accommodation frame is fixed between the two right-angle frames.

[0016] Preferably, the height adjustment assembly includes a lifting cylinder slidably mounted on the inner side of the placement frame, the lifting cylinder is fixedly mounted on the outer wall of the electric telescopic rod, a fixing plate is fixedly connected to the top of the placement frame, a screw rod is threadedly connected to the inside of the fixing plate, the screw rod is rotatably connected to the top of the lifting cylinder, shaft rods are provided on both sides of the screw rod, the shaft rods slide through the inside of the fixing plate and are fixedly connected to the upper end wall of the lifting cylinder.

[0017] The working principle and beneficial effects of the utility model are:

[0018] In the utility model, a support plate assembly is arranged inside the plate stacking frame, and limiting assemblies are arranged on both sides of the top of the plate stacking frame, wherein the limiting assembly includes a pressure plate, through which the top of the plate placed inside the plate stacking frame is resisted and limited, and a turning frame is arranged on the rear side of the plate stacking frame, and an electric telescopic rod is installed on the turning frame, through which the plate located at the top inside the plate stacking frame is pushed away. The limiting assembly and the turning frame can be turned over on the plate placing frame, so as to facilitate the stacking of the plates in the plate placing frame. When the plates to be loaded are manually or hoisted and stacked on the upper end of the lifting plate inside the plate stacking frame, the lifting plate will slide down along the outer wall of the guide shaft and compress the support spring. After the plate located at the top is pushed out by the electric telescopic rod, the lifting plate is automatically raised under the action of the support spring, so that the plate located at the second top is moved up one station, and the electric telescopic rod is driven to perform the next pushing work. The operation is simple, the use is convenient, the manufacturing and use costs are low, and the use value is very high;

[0019] In the utility model, a height adjustment component is arranged on the turning frame, and the working height of the electric telescopic rod can be adjusted by the height adjustment component, so that the plate can be pushed away accurately. A guide positioning component is arranged on the front side of the plate stacking frame, and when the plate is loaded, the height of the roller and the electric telescopic rod can be adjusted according to the single thickness of the plate, so that the vertical distance between the roller and the rotating ball at the bottom of the pressure plate is adapted to the single thickness of the plate, so that the roller can support and guide the plate pushed away from the inner side of the plate stacking frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a plate loading and transferring rack proposed by the utility model;

[0022] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0023] Figure 3 This is a schematic diagram of the assembly structure of a plate loading and transfer rack proposed by the utility model;

[0024] Figure 4 This is a schematic diagram of the assembly structure of the flip frame and height adjustment component proposed by the utility model;

[0025] In the figure:

[0026] 1. Plate stacking frame; 101. T-shaped guide cavity;

[0027] 2. Brake wheel;

[0028] 3. Turning frame; 301. Right angle plate; 302. Right angle frame; 303. Placement frame;

[0029] 4. Electric telescopic rod;

[0030] 5. Height adjustment assembly; 501. Lifting cylinder; 502. Shaft rod; 503. Screw rod; 504. Fixing plate;

[0031] 6. Limiting assembly; 601. Pressing plate; 602. Ball sleeve; 603. Rotating ball;

[0032] 7. Fixing assembly; 701. Insertion rod; 702. Rotating head; 703. First bracket; 704. Threaded section; 705. Connecting plate; 706. Second bracket;

[0033] 8. Guide and positioning assembly; 801. Roller; 802. Lifting frame; 803. Inner plate; 804. Screw; 805. Threaded seat; 806. Turntable;

[0034] 9. Support plate assembly; 901. Guide shaft; 902. Lifting plate; 903. Support spring. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1 , Figure 2 as well as Figure 3 A plate material loading and transfer rack comprises: a plate stacking frame 1 and four brake wheels 2 which are rotatably connected to the four corners of the bottom of the plate stacking frame 1, and the entire device is transferred by the brake wheels 2 to move it to the plate processing point. A support plate assembly 9 is arranged inside the plate stacking frame 1, which is used to support the plate placed inside the plate stacking frame 1. Limiting assemblies 6 are arranged on both sides of the top of the plate stacking frame 1. The limiting assembly 6 comprises a pressing plate 601, which is used to limit the top of the plate placed inside the plate stacking frame 1. A fixing assembly 7 is arranged between the pressing plate 601 and the plate stacking frame 1, which is used to constrain and fix the pressing plate 601.

[0037] There are two T-shaped guide cavities 101 on the opposite inner walls of the plate stacking frame 1, and the support plate assembly 9 includes a lifting plate 902 that is slidably sleeved on the inner side of the plate stacking frame 1 for stacking the plates, and the lifting plate 902 extends to the inner side of the T-shaped guide cavity 101 and is slidably connected thereto. A guide shaft 901 is fixedly connected to the inner side of each T-shaped guide cavity 101, and the guide shaft 901 slides through the inside of the lifting plate 902, and a support spring 903 is sleeved on the outer wall of the guide shaft 901, and the two ends of the support spring 903 are respectively fixedly connected to the lower end wall of the lifting plate 902 and the bottom of the T-shaped guide cavity 101.

[0038] Furthermore, the limiting assembly 6 also includes ball sleeves 602 evenly distributed at the bottom of the pressure plate 601 , and a rotating ball 603 is rotatably mounted inside each ball sleeve 602 .

[0039] Furthermore, the fixing assembly 7 includes a connecting plate 705 rotatably connected to the top of the sheet stacking frame 1, the connecting plate 705 is fixedly connected to the outer wall of the pressure plate 601, a second bracket 706 is fixedly connected to the upper end of the connecting plate 705, a first bracket 703 is fixedly connected to the top of the sheet stacking frame 1, an insertion rod 701 is commonly connected between the first bracket 703 and the second bracket 706, and a rotating head 702 is fixedly connected to one end of the insertion rod 701, the insertion rod 701 and the second bracket 706 are slidingly connected, a threaded section 704 is provided on the side of the insertion rod 701 close to the rotating head 702, and the threaded section 704 is threadedly connected to the first bracket 703.

[0040] Specifically, before loading and transferring the plates, the insert rod 701 is rotated by the rotating head 702 so that the threaded section 704 is screwed out from the inside of the first bracket 703. Then, the pressing plate 601 is manually flipped over to completely open the upper port of the plate stacking frame 1. Next, the bolts connecting one set of right-angle brackets 302 and the right-angle plate 301 are unscrewed, and the right-angle brackets 302 on the other set are flipped over on the right-angle plate 301 by the rotating shaft. Figure 3 As shown, the rear port of the plate stacking frame 1 is fully opened.

[0041] Next, the plates to be loaded are manually or hoisted and stacked on the upper end of the lifting plate 902 inside the plate stacking frame 1. As the plates on the upper end of the lifting plate 902 are piled up, the lifting plate 902 will slide down along the outer wall of the guide shaft 901 and compress the support spring 903. After stacking a suitable number of plates, the pressing plate 601 is turned over to a horizontal state (such as Figure 1 As shown in FIG. 1 , at this time, the rotating ball 603 at the bottom of the pressing plate 601 contacts the bottom of the plate to restrict the height of the plate. Next, the turning frame 3 is turned over again to the initial state.

[0042] See also Figure 1 , Figure 2 as well as Figure 4 A turning frame 3 is arranged at the rear side of the plate stacking frame 1, and an electric telescopic rod 4 is installed on the turning frame 3. The electric telescopic rod 4 is used to push away the plate at the top of the plate stacking frame 1. A height adjustment component 5 is arranged on the turning frame 3 to adjust the working height of the electric telescopic rod 4. A guide positioning component 8 is arranged at the front side of the plate stacking frame 1. When the electric telescopic rod 4 pushes away the plate at the top, the guide positioning component 8 guides the plate at the top and constrains the remaining plates.

[0043] Among them, the guiding and positioning component 8 includes an inner plate 803 fixedly connected to the bottom of the plate stacking frame 1, a lifting frame 802 is provided on the outer sliding sleeve of the inner plate 803, a roller 801 is rotatably connected to the top of the lifting frame 802, a threaded seat 805 is fixedly connected to the outer wall of the lifting frame 802, a turntable 806 is rotatably connected to the bottom of the plate stacking frame 1, a screw 804 is fixedly connected to the top of the turntable 806, and the screw 804 passes through the inside of the threaded seat 805 and is threadedly connected thereto.

[0044] Furthermore, the flip frame 3 includes two right-angle plates 301 fixed to the side wall of the plate stacking frame 1 by bolts, and the outer walls of the two right-angle plates 301 are connected to the right-angle frames 302, one of the right-angle plates 301 is rotatably connected to the right-angle frame 302 by a rotating shaft, and the other right-angle plate 301 is fixed to the right-angle frame 302 by bolts, and a placement frame 303 is fixed between the two right-angle frames 302.

[0045] Furthermore, the height adjustment assembly 5 includes a lifting cylinder 501 slidably mounted on the inner side of the placement frame 303, the lifting cylinder 501 is fixedly mounted on the outer wall of the electric telescopic rod 4, a fixing plate 504 is fixedly connected to the top of the placement frame 303, a screw rod 503 is threadedly connected to the inside of the fixing plate 504, the screw rod 503 is rotatably connected to the top of the lifting cylinder 501, shaft rods 502 are arranged on both sides of the screw rod 503, the shaft rods 502 slide through the inside of the fixing plate 504 and are fixedly connected to the upper end wall of the lifting cylinder 501.

[0046] Specifically, when the plate is being loaded, the height of the roller 801 and the electric telescopic rod 4 is adjusted according to the single thickness of the plate. Specifically, by rotating the screw rod 503, the screw rod 503 can be lifted and lowered inside the fixed plate 504, thereby driving the lifting cylinder 501 to slide inside the placement frame 303, and then the working height of the electric telescopic rod 4 can be adjusted, so that the electric telescopic rod 4 can accurately push away the plate to be loaded. The screw rod 804 is rotated by the turntable 806, so that the threaded seat 805 is lifted and lowered along the outer wall of the screw rod 804, so that the lifting frame 802 slides on the outer wall of the inner plate 803, so that the working height of the roller 801 can be adjusted, so that the vertical distance between the roller 801 and the rotating ball 603 at the bottom of the pressing plate 601 is adapted to the single thickness of the plate, so that the roller 801 can support and guide the plate pushed away from the inner side of the plate stacking frame 1.

[0047] Working principle and usage process: Initially, if Figure 1As shown, before loading and transferring the plates, the insert rod 701 is rotated by the rotating head 702 so that the threaded section 704 is screwed out from the inside of the first bracket 703. Then, the pressing plate 601 is manually flipped over to completely open the upper port of the plate stacking frame 1. Next, the bolts connecting one set of right-angle brackets 302 and the right-angle plate 301 are unscrewed, and the right-angle brackets 302 on the other set are flipped over on the right-angle plate 301 by the rotating shaft, as shown in FIG. Figure 3 As shown, the rear port of the plate stacking frame 1 is fully opened.

[0048] Next, the plates to be loaded are manually or hoisted and stacked on the upper end of the lifting plate 902 inside the plate stacking frame 1. As the plates on the upper end of the lifting plate 902 are piled up, the lifting plate 902 will slide down along the outer wall of the guide shaft 901 and compress the support spring 903. After stacking a suitable number of plates, the pressing plate 601 is turned over to a horizontal state (such as Figure 1 As shown in FIG. 1 , at this time, the rotating ball 603 at the bottom of the pressing plate 601 contacts the bottom of the plate to restrict the height of the plate. Next, the turning frame 3 is turned over again to the initial state.

[0049] Afterwards, the turning frame 3 can be used as a handle to transfer the entire device through the brake wheel 2 and move it to the plate processing point. Then, according to the single body thickness of the plate, the height of the roller 801 and the electric telescopic rod 4 are adjusted. Specifically, by rotating the screw rod 503, the screw rod 503 can be lifted and lowered inside the fixed plate 504, thereby driving the lifting cylinder 501 to slide inside the placement frame 303, and then the working height of the electric telescopic rod 4 can be adjusted, so that the electric telescopic rod 4 can accurately push away the plate to be loaded. The screw rod 804 is rotated by the turntable 806, so that the threaded seat 805 is lifted and lowered along the outer wall of the screw rod 804, so that the lifting frame 802 slides on the outer wall of the inner plate 803, so that the working height of the roller 801 can be adjusted, so that the vertical distance between the roller 801 and the rotating ball 603 at the bottom of the pressing plate 601 is adapted to the single body thickness of the plate, so that the roller 801 can support and guide the plate pushed away from the inner side of the plate stacking frame 1. After the plate at the top is pushed out by the electric telescopic rod 4, the lifting plate 902 is automatically raised under the action of the support spring 903, so that the plate at the second top moves up one station, and the electric telescopic rod 4 performs the next pushing operation.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plate loading and transfer rack, comprising: A plate stacking frame (1) and four brake wheels (2) rotatably connected to the four corners of the bottom of the plate stacking frame (1), characterized in that a support plate assembly (9) is arranged inside the plate stacking frame (1) for supporting the plates placed inside the plate stacking frame (1), and limiting assemblies (6) are arranged on both sides of the top of the plate stacking frame (1), and the limiting assembly (6) includes a pressing plate (601), and the top of the plates placed inside the plate stacking frame (1) is limited by the pressing plate (601), and a fixing assembly (7) is arranged between the pressing plate (601) and the plate stacking frame (1) for restraining and fixing the pressing plate (601); A turning frame (3) is arranged at the rear side of the plate stacking frame (1), and an electric telescopic rod (4) is installed on the turning frame (3), and the plates at the top of the plate stacking frame (1) are pushed away by the electric telescopic rod (4); a height adjustment component (5) is arranged on the turning frame (3) and is used to adjust the working height of the electric telescopic rod (4); A guide positioning assembly (8) is provided on the front side of the plate stacking frame (1); when the electric telescopic rod (4) pushes away the plate at the top, the guide positioning assembly (8) guides the plate at the top and constrains the remaining plates.

2. A plate material loading and transfer rack according to claim 1, characterized in that: Two T-shaped guide cavities (101) are provided on the opposite inner walls of the plate stacking frame (1), and the support plate assembly (9) comprises a lifting plate (902) slidably sleeved on the inner side of the plate stacking frame (1) for stacking plates, and the lifting plate (902) extends to the inner side of the T-shaped guide cavity (101) and is slidably connected thereto.

3. A plate material loading and transfer rack according to claim 2, characterized in that: A guide shaft (901) is fixedly connected to the inner side of each T-shaped guide cavity (101), and the guide shaft (901) slides through the interior of the lifting plate (902). A support spring (903) is sleeved on the outer wall of the guide shaft (901), and two ends of the support spring (903) are respectively fixedly connected to the lower end wall of the lifting plate (902) and the bottom of the T-shaped guide cavity (101).

4. A plate material loading and transfer rack according to claim 1, characterized in that: The position limiting assembly (6) further comprises ball sleeves (602) evenly distributed at the bottom of the pressing plate (601), and each of the ball sleeves (602) is provided with a rotating ball (603) inside.

5. The plate loading and transferring rack according to claim 1, characterized in that: The guide positioning assembly (8) comprises an inner plate (803) fixedly connected to the bottom of the plate stacking frame (1); a lifting frame (802) is provided on the outer sliding sleeve of the inner plate (803); a roller (801) is rotatably connected to the top of the lifting frame (802); a threaded seat (805) is fixedly connected to the outer wall of the lifting frame (802); a turntable (806) is rotatably connected to the bottom of the plate stacking frame (1); a screw rod (804) is fixedly connected to the top of the turntable (806); the screw rod (804) passes through the interior of the threaded seat (805) and is threadedly connected thereto.

6. A plate material loading and transfer rack according to claim 4, characterized in that: The fixing assembly (7) comprises a connecting plate (705) rotatably connected to the top of the plate stacking frame (1); the connecting plate (705) is fixedly connected to the outer wall of the pressing plate (601); a second bracket (706) is fixedly connected to the upper end of the connecting plate (705); a first bracket (703) is fixedly connected to the top of the plate stacking frame (1); an insertion rod (701) is commonly connected between the first bracket (703) and the second bracket (706); one end of the insertion rod (701) is fixedly connected to a rotating head (702); the insertion rod (701) and the second bracket (706) are slidably connected; a threaded section (704) is provided on a side of the insertion rod (701) close to the rotating head (702); and the threaded section (704) is threadedly connected to the first bracket (703).

7. A plate material loading and transfer rack according to claim 1, characterized in that: The turning frame (3) comprises two right-angle plates (301) fixedly connected to the side walls of the plate stacking frame (1) by means of bolts, the outer walls of the two right-angle plates (301) are both connected to right-angle frames (302), one of the right-angle plates (301) is rotatably connected to the right-angle frame (302) by means of a rotating shaft, the other right-angle plate (301) is fixedly connected to the right-angle frame (302) by means of bolts, and a placement frame (303) is fixedly connected between the two right-angle frames (302).

8. A plate material loading and transferring rack according to claim 7, characterized in that: The height adjustment assembly (5) comprises a lifting cylinder (501) slidably sleeved on the inner side of the placement frame (303); the lifting cylinder (501) is fixedly sleeved on the outer wall of the electric telescopic rod (4); a fixing plate (504) is fixedly connected to the top of the placement frame (303); a screw rod (503) is threadedly connected inside the fixing plate (504); the screw rod (503) is rotatably connected to the top of the lifting cylinder (501); shaft rods (502) are provided on both sides of the screw rod (503); the shaft rods (502) slidably penetrate the interior of the fixing plate (504) and are fixedly connected to the upper end wall of the lifting cylinder (501).

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