Novel adjustable tray warehouse

Abstract

The invention relates to the technical field of tray storage and distribution, in particular to a novel adjustable tray warehouse, and solves the problems that an existing tray warehouse inconveniently stores and lifts trays of different models and sizes and cannot automatically distribute a plurality of trays, so that the tray feeding efficiency is low. A novel adjustable tray warehouse comprises a lifting driving mechanism, a rocker arm lifting mechanism and a stroke monitoring mechanism, the stroke monitoring mechanism is installed on one side of the lifting driving mechanism, the rocker arm lifting mechanism is installed in the middle of the lifting driving mechanism, and a plurality of tray bodies are installed at the front end of the rocker arm lifting mechanism. And the lifting driving mechanism comprises a rack main body, a fixed supporting cross rod is fixedly installed at the upper end of the rack main body, and two sliding seats are slidably connected to the middle of the rack main body. By lifting and sequentially distributing the multiple stacked trays, the trays can be rapidly fed conveniently, and the requirement for storage of the trays of different models and sizes can be met.

Description

Technical Field

[0001] The invention relates to the technical field of pallet storage and distribution, in particular to a novel adjustable pallet library. Background Art

[0002] Pallets facilitate the loading and unloading, transportation, storage, and distribution of goods, and are the primary means of transforming static cargo into dynamic cargo. They possess properties such as flexibility, bending, impact resistance, and durability, earning them the nickname "movable floor" or "mobile cargo platform." When loading large quantities of pallets, pallet warehouses are required for storage and distribution. Pallet warehouses are widely used in logistics warehousing, manufacturing, cold chain storage, e-commerce logistics, and specialized industries.

[0003] The existing pallet warehouse is not convenient for storing and lifting pallets of different models and sizes, and cannot automatically distribute multiple pallets, resulting in low pallet loading efficiency; therefore, it does not meet existing needs. For this purpose, we propose a new type of adjustable pallet warehouse. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of adjustable pallet library to solve the problem raised in the above background technology that the existing pallet library is not convenient for storing and lifting pallets of different models and sizes, and cannot automatically distribute multiple pallets, resulting in low pallet loading efficiency.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a novel adjustable pallet library, comprising a lifting drive mechanism, a rocker arm lifting mechanism and a stroke monitoring mechanism, wherein a stroke monitoring mechanism is installed on one side of the lifting drive mechanism, a rocker arm lifting mechanism is installed in the middle of the lifting drive mechanism, and a plurality of pallet bodies are installed at the front end of the rocker arm lifting mechanism, the lifting drive mechanism comprises a frame body, a fixed support cross bar is fixedly installed on the upper end of the frame body, two sliding seats are slidably connected to the middle part of the frame body, a transmission shaft is installed between the two sliding seats, and movable support cross bars are installed above and below the transmission shaft; The rocker arm lifting mechanism includes a second transmission motor, which is slidably connected to one of the movable supporting cross bars, and one end of the second transmission motor is fixedly installed with a gear box, and the inner side of the gear box is rotatably connected to a transmission screw, and both ends of the transmission screw are installed with a connecting frame, the rear end face of the connecting frame is fixedly installed with a guide vertical frame, and the front end face of the connecting frame is fixedly installed with a positioning angle plate, the inner sides of the two connecting frames are rotatably connected to four guide wheels, the bottom ends of the guide wheels are fixedly installed with a bearing package, and the inner side of the bearing package is rotatably connected to a connecting shaft, and a rocker arm frame is installed in the middle of the connecting shaft, and two lifting plug plates are installed on one side of the two rocker arm frames, and a cylinder is installed at the rear end of the rocker arm frame below the connecting shaft, and the output end of the cylinder is rotatably connected to a connecting rod.

[0006] Preferably, the lifting drive mechanism also includes a reducer fixedly connected to one of the sliding seats, the input end of the reducer is fixedly installed with a first transmission motor, the inner side of the sliding seat is rotatably connected to a transmission sprocket, and a transmission chain is installed on one side of the transmission sprocket.

[0007] Preferably, the travel monitoring mechanism includes a monitoring mounting frame, which is fixedly connected to the frame body. Travel switches are fixedly mounted on both upper and lower ends of the monitoring mounting frame, and three light detectors are installed between two of the travel switches.

[0008] Preferably, the frame body is fixedly connected to the upper and lower ends of the two transmission chains, both ends of the transmission shaft pass through the sliding seat and are fixedly connected to the two transmission sprockets, the transmission sprockets are meshed and rollingly connected with the transmission chains, and the output end of the first transmission motor is connected to one end of the transmission shaft through a reducer.

[0009] Preferably, both ends of the movable supporting cross bar are fixedly connected to two sliding seats, and the sliding seat, the movable supporting cross bar and the transmission shaft slide back and forth vertically along the transmission chain.

[0010] Preferably, the guide frame and the positioning angle plate are fixedly connected by a connecting frame, the cylinder and the bottom end of the connecting frame are rotatably connected by a pin, the output end of the cylinder and the rocker frame are rotatably connected by a connecting rod, the rear end of the rocker frame is sleeved and fixed on the outside of the middle part of the connecting shaft, both ends of the connecting shaft are connected to the connecting frame by bearing packages, and the rocker frame swings back and forth relative to the axis of the connecting shaft.

[0011] Preferably, a plurality of equidistant positioning holes are provided on one side of the rocker frame, and screws are provided on the inner sides of the equidistant positioning holes. The screws pass through the equidistant positioning holes and are connected to the lifting plates by threads. One end of the four lifting plates is inserted into the inner side of the four end corners of one of the pallet bodies. Two of the rocker frames are connected to one of the pallet bodies through four lifting plates, and the multiple pallet bodies are stacked in sequence from bottom to top.

[0012] Preferably, the two connecting frames are connected to the two movable supporting cross bars through guide wheels, the guide wheels are rollingly connected to the movable supporting cross bars, a gear set is provided on the inner side of the gear box, and the output end of the second transmission motor is connected to the middle part of the transmission screw through a gear set.

[0013] Preferably, both ends of the transmission screw pass through the connecting frame and are rotatably connected to the two sliding seats through bearings. Both ends of the transmission screw are provided with external threads with opposite rotation directions. The two ends of the transmission screw are connected to the two connecting frames through threads, and the two connecting frames slide in opposite directions along the axis of the transmission screw.

[0014] Preferably, the monitoring mounting frame is fixedly connected to the frame body, the travel switch and the light detector are electrically connected, and a contact is provided at one end of the light detector.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a plurality of equidistant positioning holes on one side of the rocker frame. Screws are inserted through the equidistant positioning holes and threadedly connected to the lifting plates. The screws can be used to adjust and fix the spacing between two adjacent lifting plates. A second transmission motor drives the transmission screw to rotate, which in turn drives the two connecting frames to move in opposite directions or toward each other, thereby adjusting the spacing between the two rocker frames to meet the lifting operation requirements for pallets of different sizes. 2. The present invention drives two rocker arms to swing in opposite directions relative to the axis of the connecting shaft through two cylinders via a connecting rod. The two rocker arms then drive four lifting plugs to plug into the end corners of the pallet body, thereby achieving positioning and installation of the pallet body. Multiple pallet bodies can then be stacked and placed sequentially from bottom to top using a forklift, thereby achieving stacked storage of multiple pallet bodies. The travel is monitored by contacts provided on the two travel switches to ensure that the travel of the pallet body is between the two travel switches. Furthermore, the lifting distance of the pallet body can be monitored by a light detector, thereby facilitating precise control of the height of the pallet body. 3. The present invention drives the drive shaft and two drive sprockets to rotate through the reducer by the first transmission motor, and then the transmission sprocket engages with the transmission chain to roll and drive the two sliding seats to move downward, swinging the two rocker arms in the direction and separating the lifting plate from the pallet body at the lowest end, and then drives the rocker arm lifting mechanism to move upward through the sliding seat and connects the second pallet body from bottom to top through the lifting plate, thereby being able to separate multiple pallet bodies and realize the sequential transportation and distribution of multiple pallet bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 A front view of the present invention as a whole; Figure 3 Schematic diagram of the installation structure of the reducer of the present invention; Figure 4 Schematic diagram of the installation structure of the transmission shaft of the present invention; Figure 5 Schematic diagram of the structure of the travel monitoring mechanism of the present invention; Figure 6 It is a side view of the rocker arm lifting mechanism of the present invention; Figure 7 Schematic diagram of the installation structure of the cylinder of the present invention; Figure 8 This is a schematic diagram of the separation state of the lifting board of the present invention; Figure 9 This is a schematic diagram of the plug-in state of the lifting plug-in board of the present invention; Figure 10 Schematic diagram of the installation structure of the transmission screw of the present invention; Figure 11 Schematic diagram of distributing the tray body of the present invention.

[0017] In the figure: 1. Lifting drive mechanism; 101. Frame body; 102. Sliding seat; 103. First transmission motor; 104. Reducer; 105. Transmission chain; 106. Fixed support cross bar; 107. Movable support cross bar; 108. Transmission shaft; 109. Transmission sprocket; 2. Rocker arm lifting mechanism; 201. Guide frame; 202. Positioning angle plate; 203. Connecting frame; 204. Bearing package; 205. Connecting shaft; 206. Rocker arm frame; 207. Lifting plug plate; 208. Connecting rod; 209. Cylinder; 210. Guide wheel; 211. Transmission screw; 212. Second transmission motor; 213. Gear box; 3. Travel monitoring mechanism; 301. Monitoring mounting frame; 302. Travel switch; 303. Light detector; 4. Tray body. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] The first transmission motor 103 (model GV50-3.7KW-60-S), the cylinder 209 (model CDQMB80-50DZ) and the second transmission motor 212 (model KOM7080) mentioned in the present invention can all be purchased from the market or customized.

[0020] See also Figure 1 、 Figure 2 and Figure 11 The present invention provides an embodiment: a new type of adjustable pallet library, including a lifting drive mechanism 1, a rocker lifting mechanism 2 and a stroke monitoring mechanism 3. The stroke monitoring mechanism 3 is installed on one side of the lifting drive mechanism 1, the rocker lifting mechanism 2 is installed in the middle of the lifting drive mechanism 1, and multiple pallet bodies 4 are installed at the front end of the rocker lifting mechanism 2, so that the lifting drive mechanism 1 drives the pallet bodies 4 to rise and fall through the rocker lifting mechanism 2, thereby realizing the storage and distribution of multiple pallet bodies 4.

[0021] See also Figures 1 to 4The lifting drive mechanism 1 includes a frame body 101, a fixed support cross bar 106 is fixedly installed on the upper end of the frame body 101, and two sliding seats 102 are slidably connected to the middle part of the frame body 101. A transmission shaft 108 is installed between the two sliding seats 102, and movable support cross bars 107 are installed above and below the transmission shaft 108. The inner side of the sliding seat 102 is rotatably connected to a transmission sprocket 109. Both ends of the transmission shaft 108 pass through the sliding seat 102 and are fixedly connected to the two transmission sprockets 109. The two transmission sprockets 109 can be driven to rotate synchronously through the transmission shaft 108; A reducer 104 is fixedly installed on one side of one of the sliding seats 102, and a first transmission motor 103 is fixedly installed on the input end of the reducer 104. A transmission chain 105 is installed on one side of the transmission sprocket 109. The frame body 101 is fixedly connected to the upper and lower ends of the two transmission chains 105. The transmission sprocket 109 is meshed and rolled with the transmission chain 105. The output end of the first transmission motor 103 is connected to one end of the transmission shaft 108 through the reducer 104. Both ends of the movable supporting cross bar 107 are fixedly connected to the two sliding seats 102. The sliding seat 102, the movable supporting cross bar 107 and the transmission shaft 108 slide back and forth vertically along the transmission chain 105. The transmission sprocket 109 is meshed and rolled with the transmission chain 105 and drives the two sliding seats 102 to achieve vertical sliding.

[0022] See also Figures 6 to 10 The rocker arm lifting mechanism 2 includes a second transmission motor 212, which is slidably connected to one of the movable support cross bars 107. A gear box 213 is fixedly installed at one end of the second transmission motor 212. A transmission screw 211 is rotatably connected to the inner side of the gear box 213. A connecting frame 203 is installed at both ends of the transmission screw 211. A guide stand 201 is fixedly installed on the rear end face of the connecting frame 203. A positioning angle plate 202 is fixedly installed on the front end face of the connecting frame 203. The guide wheel 210 is rollingly connected to the movable support cross bar 107. A gear set is provided on the inner side of the gear box 213. The output of the second transmission motor 212 The end is connected to the middle part of the transmission screw 211 through a gear set. Both ends of the transmission screw 211 pass through the connecting frame 203 and are rotatably connected to the two sliding seats 102 through bearings. Both ends of the transmission screw 211 are provided with external threads with opposite rotation directions. The two ends of the transmission screw 211 are connected to the two connecting frames 203 through threads. The two connecting frames 203 slide in opposite directions along the axis of the transmission screw 211, so that the second transmission motor 212 drives the transmission screw 211 to rotate, and then the transmission screw 211 drives the spacing between the two rocker frames 206 to adjust, so as to meet the lifting operation of the pallet body 4 of different models and sizes; The inner sides of the two connecting frames 203 are rotatably connected with four guide wheels 210, the guide stand 201 is fixedly connected to the positioning angle plate 202 through the connecting frame 203, the two connecting frames 203 are connected to the two movable support cross bars 107 through the guide wheels 210, the bottom ends of the guide wheels 210 are fixedly installed with bearing packages 204, the inner sides of the bearing packages 204 are rotatably connected with the connecting shaft 205, the middle part of the connecting shaft 205 is installed with a rocker frame 206, the rear end of the rocker frame 206 is located below the connecting shaft 205 and is installed with a cylinder 209, the output end of the cylinder 209 is rotatably connected to the connecting rod 208, the air cylinder 209 is rotatably connected to the connecting rod 208, and the air cylinder 209 is rotatably connected to the connecting rod 208. The cylinder 209 is rotatably connected to the bottom end of the connecting frame 203 through a pin, and the output end of the cylinder 209 is rotatably connected to the rocker frame 206 through a connecting rod 208. The rear end of the rocker frame 206 is sleeved and fixed on the outer side of the middle part of the connecting shaft 205. Both ends of the connecting shaft 205 are connected to the connecting frame 203 through a bearing package 204. The rocker frame 206 swings back and forth relative to the axis of the connecting shaft 205, so that the two cylinders 209 drive the four lifting plugs 207 through the connecting rod 208 and the two rocker frames 206 to plug the end corners of the pallet body 4, thereby realizing the positioning and installation of the pallet body 4; Two lifting plates 207 are installed on one side of the two rocker frames 206. One side of the rocker frames 206 is provided with multiple equidistant positioning holes, and screws are provided on the inner side of the equidistant positioning holes. The screws pass through the equidistant positioning holes and are connected to the lifting plates 207 by threads. One end of the four lifting plates 207 is inserted into the inner side of the four end corners of one of the pallet bodies 4. The two rocker frames 206 are connected to one of the pallet bodies 4 through the four lifting plates 207. Multiple pallet bodies 4 are stacked in sequence from bottom to top, and the multiple pallet bodies 4 are lifted by the four lifting plates 207, which is convenient for storing multiple pallet bodies 4.

[0023] See also Figure 1 and Figure 5 The travel monitoring mechanism 3 includes a monitoring mounting frame 301, which is fixedly connected to the rack body 101. Travel switches 302 are fixedly installed at the upper and lower ends of the monitoring mounting frame 301. Three light detectors 303 are installed between the two travel switches 302. The monitoring mounting frame 301 is fixedly connected to the rack body 101. The travel switch 302 and the light detector 303 are electrically connected. A contact is provided at one end of the light detector 303. The travel monitoring is performed through the contacts on the two travel switches 302 to ensure that the travel of the tray body 4 is between the two travel switches 302.

[0024] In summary, the distance between two adjacent lifting plates 207 on each rocker frame 206 is adjusted. Specifically, a plurality of equidistant positioning holes are provided on one side of the rocker frame 206. Screws are passed through the equidistant positioning holes and connected to the lifting plates 207 by threads, so that the distance between the two adjacent lifting plates 207 can be adjusted and fixed by the screws. Turn on the power and start the second transmission motor 212, so that the second transmission motor 212 drives the transmission screw 211 to rotate through the gear set in the gear box 213 under the support of one of the movable support cross bars 107, and then the transmission screw 211 drives the two connecting frames 203 to move in opposite directions or toward each other under the support of the two sliding seats 102, so that the spacing between the two rocker frames 206 can be adjusted to meet the lifting operation of pallet bodies 4 of different models and sizes.

[0025] The pallet body 4 is inserted and transferred between the four lifting plug plates 207 by a forklift, and the two cylinders 209 are started, so that the two cylinders 209 drive the two rocker frames 206 to swing in opposite directions relative to the axis of the connecting shaft 205 through the connecting rod 208 under the support of the connecting frame 203, and then the two rocker frames 206 drive the four lifting plug plates 207 to be able to plug the end corners of the pallet body 4, thereby realizing the positioning and installation of the pallet body 4, and then the forklift can be used to stack multiple pallet bodies 4 from bottom to top. When the number of pallet bodies 4 between the two rocker frames 206 is sufficient, the first transmission motor 103 is started, so that the first transmission motor 103 drives the transmission shaft 108 and the two transmission sprockets 109 to rotate through the reducer 104, and then the transmission sprocket 109 engages with the transmission chain 105 to roll and drive the two sliding seats 102 to move downward, so that the pallet body 4 is placed on the conveyor; At this time, the two rocker arms 206 are swung in the direction to separate the lifting plate 207 from the pallet body 4 at the lowest end, and then the sliding seat 102 drives the rocker arm lifting mechanism 2 to move upward and plug the second pallet body 4 from the bottom to the top through the lifting plate 207, thereby separating multiple pallet bodies 4. When the conveyor is running, multiple pallet bodies 4 are separated in turn, and multiple pallet bodies 4 can be transported and distributed in sequence; When the sliding seat 102 drives multiple tray bodies 4 to perform vertical reciprocating lifting and lowering through the rocker arm lifting mechanism 2, the stroke is monitored by the contacts provided on the two travel switches 302 to ensure that the stroke of the tray body 4 is between the two travel switches 302, and the lifting distance of the tray body 4 can be monitored by the light detector 303, which is convenient for precise control of the height of the tray body 4.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A novel adjustable pallet warehouse, comprising a lifting drive mechanism (1), a rocker arm lifting mechanism (2) and a travel monitoring mechanism (3), characterized in that: A travel monitoring mechanism (3) is installed on one side of the lifting drive mechanism (1), a rocker arm lifting mechanism (2) is installed in the middle of the lifting drive mechanism (1), and a plurality of tray bodies (4) are installed at the front end of the rocker arm lifting mechanism (2), and the lifting drive mechanism (1) comprises a frame body (101), a fixed support cross bar (106) is fixedly installed on the upper end of the frame body (101), two sliding seats (102) are slidably connected to the middle of the frame body (101), a transmission shaft (108) is installed between the two sliding seats (102), and movable support cross bars (107) are installed above and below the transmission shaft (108); The rocker arm lifting mechanism (2) comprises a second transmission motor (212), the second transmission motor (212) being slidably connected to one of the movable support cross bars (107), a gear box (213) being fixedly mounted on one end of the second transmission motor (212), a transmission screw (211) being rotatably connected to the inner side of the gear box (213), connecting frames (203) being mounted on both ends of the transmission screw (211), a guide stand (201) being fixedly mounted on the rear end face of the connecting frame (203), a positioning angle plate (202) being fixedly mounted on the front end face of the connecting frame (203), and two The inner side of the connecting frame (203) is rotatably connected to four guide wheels (210), the bottom end of the guide wheel (210) is fixedly mounted with a bearing package (204), the inner side of the bearing package (204) is rotatably connected to a connecting shaft (205), a rocker frame (206) is mounted in the middle of the connecting shaft (205), two lifting plates (207) are mounted on one side of the two rocker frames (206), a cylinder (209) is mounted at the rear end of the rocker frame (206) below the connecting shaft (205), and a connecting rod (208) is rotatably connected to the output end of the cylinder (209).

2. According to claim 1, the novel adjustable pallet warehouse is characterized by: The lifting drive mechanism (1) further comprises a reducer (104) fixedly connected to one of the sliding seats (102); a first transmission motor (103) is fixedly mounted on an input end of the reducer (104); a transmission sprocket (109) is rotatably connected to the inner side of the sliding seat (102); and a transmission chain (105) is mounted on one side of the transmission sprocket (109).

3. According to claim 2, the novel adjustable pallet warehouse is characterized by: The travel monitoring mechanism (3) comprises a monitoring mounting frame (301), the monitoring mounting frame (301) being fixedly connected to the frame body (101), travel switches (302) being fixedly mounted at both upper and lower ends of the monitoring mounting frame (301), and three light detectors (303) being mounted between two of the travel switches (302).

4. According to claim 2, the novel adjustable pallet warehouse is characterized by: The frame body (101) is fixedly connected to the upper and lower ends of the two transmission chains (105); both ends of the transmission shaft (108) pass through the sliding seat (102) and are fixedly connected to the two transmission sprockets (109); the transmission sprockets (109) are meshed and rollingly connected to the transmission chains (105); and the output end of the first transmission motor (103) is transmission-connected to one end of the transmission shaft (108) via a reducer (104).

5. According to claim 4, the novel adjustable pallet warehouse is characterized by: Both ends of the movable support cross bar (107) are fixedly connected to the two sliding seats (102), and the sliding seat (102), the movable support cross bar (107) and the transmission shaft (108) slide back and forth vertically along the transmission chain (105).

6. The novel adjustable pallet storage according to claim 2 is characterized in that: The guide stand (201) is fixedly connected to the positioning angle plate (202) via a connecting frame (203); the cylinder (209) is rotatably connected to the bottom end of the connecting frame (203) via a pin; the output end of the cylinder (209) is rotatably connected to the rocker frame (206) via a connecting rod (208); the rear end of the rocker frame (206) is sleeved and fixed on the outer side of the middle part of the connecting shaft (205); both ends of the connecting shaft (205) are connected to the connecting frame (203) via a bearing package (204); and the rocker frame (206) reciprocates relative to the axis of the connecting shaft (205).

7. The novel adjustable pallet warehouse according to claim 6 is characterized by: A plurality of equidistant positioning holes are provided on one side of the rocker frame (206), and screws are provided on the inner sides of the equidistant positioning holes. The screws penetrate the equidistant positioning holes and are threadedly connected to the lifting plug plates (207). One end of the four lifting plug plates (207) is plugged into the inner side of the four end corners of one of the pallet bodies (4). Two of the rocker frames (206) are connected to one of the pallet bodies (4) via the four lifting plug plates (207), and the plurality of pallet bodies (4) are stacked one on top of the other.

8. The novel adjustable pallet storage according to claim 7 is characterized in that: The two connecting frames (203) are connected to the two movable support cross bars (107) via guide wheels (210), the guide wheels (210) are rollingly connected to the movable support cross bars (107), a gear set is provided on the inner side of the gear box (213), and the output end of the second transmission motor (212) is transmission-connected to the middle of the transmission screw rod (211) via the gear set.

9. The novel adjustable pallet warehouse according to claim 8 is characterized in that: Both ends of the transmission screw (211) penetrate the connecting frame (203) and are rotatably connected to the two sliding seats (102) via bearings. Both ends of the transmission screw (211) are provided with external threads with opposite rotation directions. Both ends of the transmission screw (211) are connected to the two connecting frames (203) via threads. The two connecting frames (203) slide in opposite or opposite directions along the axis of the transmission screw (211).

10. The novel adjustable pallet storage according to claim 3 is characterized by: The monitoring mounting frame (301) is fixedly connected to the frame body (101), the travel switch (302) and the light detector (303) are electrically connected, and a contact is provided at one end of the light detector (303).

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