Negative pressure air box type purification system applied to rotary hot stamping production line

Abstract

This invention relates to the field of impurity separation equipment technology, and discloses a negative pressure air box-type purification system applied to a rotary hot stamping production line. The system includes a production line body, a roller press disposed inside the production line body, and a dust removal mechanism disposed outside the roller press. The dust removal mechanism includes symmetrically arranged turntables outside the roller press, with each turntable fixedly connected to different material rollers on the roller press. Several annular arrays are formed in the grooves on the side of the turntables away from the roller press. A slider is disposed inside the groove, and a tension spring is disposed on the side of the slider near the turntable axis, with both ends of the tension spring fixedly connected to the inner wall of the slider and the groove, respectively. A magnet is disposed on the side of the slider away from the roller press. By incorporating the dust removal mechanism, this mechanism can directly sense changes in the rotational speed of the rollers and dynamically adjust the suction air volume accordingly. It can also house the ionized air probe inside the air inlet housing to prevent dust from adhering to its surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of impurity separation equipment, and particularly relates to a negative pressure wind box type purification system applied to a round-to-round gilding production line. BACKGROUND

[0002] The negative pressure wind box type purification system applied to the round-to-round gilding production line is a key equipment for improving the production environment quality and ensuring the operation safety. In the gilding process, a large amount of non-methane total hydrocarbon, particulate matter and odor gas is generated when the high-temperature stripping of the anodized aluminum is performed. The system efficiently collects these pollutants through the gas collection hood, and uses the negative pressure principle to suck them into the pipeline to prevent the harmful gas from overflowing. After entering the purification system, the waste gas is first removed of dust and paper scraps through the high-efficiency filtering device. The application of the system not only significantly improves the air quality in the workshop, protects the respiratory health of employees and avoids the influence of odor on the surrounding environment, but also effectively prevents the dust from accumulating in the equipment, reduces the fire hazard and maintains the cleanliness inside the equipment, thereby prolonging the service life of the gilding machine.

[0003] The traditional purification system is widely used in the field of impurity separation, but due to the limitations of its structure and working principle, there are some problems that cannot be ignored. First, the system lacks a dynamic response mechanism for the gilding press roller speed. When the production line is running at variable speed or switching different processes, the change of the press roller speed directly determines the generation rate of waste gas. However, the air volume of the existing system is often set to a fixed value or adjusted with a lag, resulting in excessive air volume at low speed, causing energy waste, and insufficient suction at high speed, causing waste gas to escape, which seriously affects the environmental management effect. Second, the static electricity removal unit inside the system lacks effective storage protection structure. When the production line is stopped or the static electricity removal function is temporarily not used due to process changes, the discharge electrode and components are exposed to the dust-filled airflow channel for a long time. Due to the lack of dustproof design, the static electricity removal unit is easy to adsorb floating dust and oil stains, causing surface contamination, sensitivity decline and even short circuit. Frequent manual cleaning is required when it is started again, which greatly reduces the production efficiency and equipment reliability. SUMMARY

[0004] In view of the problems in the prior art that the negative pressure air volume of the equipment cannot be dynamically adjusted according to the speed of the press roller, and the static electricity removal components lack storage function, the negative pressure wind box type purification system applied to the round-to-round gilding production line is proposed.

[0005] The purpose is to enable the equipment to respond to the speed of the press roller, automatically adjust the air volume of the negative pressure dust removal, and store the static electricity removal components to prevent dust adhesion.

[0006] The technical scheme of the present application is a negative pressure air bellow type purification system applied to a round-to-round gilding production line, comprising a production line main body, a rolling press arranged inside the production line main body, and a dust removal mechanism arranged outside the rolling press;

[0007] The dust removal mechanism comprises two rotating discs symmetrically arranged outside the rolling press, two rotating discs are fixedly connected with different material rollers on the rolling press, a plurality of annular array grooves are arranged on the side of the rotating disc away from the rolling press, a sliding block is arranged in the groove, a tension spring is arranged on the side of the sliding block close to the rotating disc axis, the two ends of the tension spring are fixedly connected with the sliding block and the inner wall of the groove, a magnet one is arranged on the side of the sliding block away from the rolling press, a limiting plate is symmetrically arranged on the side of the rolling press close to the rotating disc, a moving rod is arranged on the side of the two limiting plates away from the rolling press, a screw sleeve is symmetrically arranged on the two ends of the moving rod, an extension rod is arranged on the inner wall of the screw sleeve, a magnet two is arranged on the end of the extension rod close to the rotating disc, an air inlet is symmetrically arranged on the inner side of the rolling press, a driving unit is arranged in the middle of the moving rod for controlling the opening and closing of the air inlet, and a telescopic unit is arranged in the air inlet for starting and closing the electrostatic function.

[0008] Further, the outer side of the extension rod is provided with a thread, the screw sleeve is provided with a screw hole along the axis, and the screw hole is threadedly connected with the extension rod.

[0009] Further, the side of the limiting plate close to the moving rod is provided with a limiting block, the ends of the moving rod close to the limiting plate are provided with limiting grooves, and the limiting grooves are slidingly connected with the limiting block.

[0010] Further, the driving unit comprises a rack symmetrically arranged on the side of the moving rod close to the middle, a valve plate arranged on the inner wall of the air inlet, a driven wheel arranged on the side of the valve plate close to the rotating disc, the driven wheel is engagedly connected with the corresponding rack, a cross rod arranged in the middle of the moving rod, a damping ring arranged in the middle of the cross rod, and a return spring sleeved on the end of the cross rod away from the moving rod, the two ends of the return spring are fixedly connected with the damping ring and the cross rod.

[0011] Further, the end of the cross rod away from the moving rod is provided with a stop block, the stop block abuts against the return spring, the inner wall of the damping ring is linearly arranged with a plurality of rubber rings, and the inner edge of the rubber ring is deviated towards the moving rod.

[0012] Further, the telescopic unit comprises wires symmetrically arranged on the top and bottom of the air inlet, a plurality of probes arranged on the bottom of the wires, respectively, a driving hole arranged on the top of the probe, knobs symmetrically arranged on the side of the rolling press close to the moving rod, a pull rod arranged on the outer side of the knob, and driving rods symmetrically arranged on the two ends of the pull rod.

[0013] Further, the middle part of the knob and the end close to the rolling machine are provided with threads, the rolling machine is adaptively connected with the two knobs through threads, a circular hole is arranged in the middle part of the end close to the moving rod of the pull rod, and the outer wall of the knob is adaptively connected with the circular hole in rotation.

[0014] Further, the middle part of the driving rod is linearly arranged with a plurality of inclined rods, the outer wall of the inclined rods is slidably connected with the inner wall of the driving hole, and the air inlet is provided with rubber pads close to the plurality of probes.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. By setting the dust removal mechanism, the mechanism can directly sense the speed change of the compression roller, and dynamically adjust the air suction volume accordingly. When the production speed changes, the negative pressure air volume adjusts accordingly, realizing the synchronous matching of air speed and production rhythm. This design increases the flexibility of the equipment, making it able to adapt to different production needs, avoiding the limitations of fixed air volume mode, and optimizing the overall operation efficiency.

[0017] 2. By setting the driving unit, the unit utilizes the mechanical force generated by the rotation of the compression roller to convert it into the power to open and close the valve plate, thereby controlling the size of the airflow passage. This design does not require additional power consumption or air source, and adjusts the air volume through physical linkage, saving energy, embodying the energy-saving and environmental protection characteristics of the system, and reducing the operating cost of the equipment.

[0018] 3. By setting the telescopic unit, when the static electricity removal function is idle, the probe of ionized air can be stored inside the air inlet housing. After the probe is protected by the housing, it can effectively isolate the external environment, prevent dust from adhering to its surface, avoid performance degradation or discharge failure due to dust accumulation, ensure the reliability and sensitivity of the probe when used next time, and reduce the maintenance workload. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application;

[0020] Figure 2 It is a schematic diagram of the connection of the rolling machine and the dust removal mechanism of the present application;

[0021] Figure 3 It is a schematic diagram of the overall structure of the dust removal mechanism of the present application;

[0022] Figure 4 It is a schematic diagram of the internal structure of the chute of the present application;

[0023] Figure 5 It is a schematic diagram of the connection of the sliding block and the chute of the present application;

[0024] Figure 6Fig. 1 is a schematic diagram of the rack and pinion connection structure of the present application;

[0025] Figure 7 Fig. 2 is a schematic diagram of the damping ring and crossbar connection of the present application;

[0026] Figure 8 Fig. 3 is a schematic diagram of the air inlet and valve relative position of the present application;

[0027] Figure 9 Fig. 4 is a schematic diagram of the drive rod and pull rod connection of the present application;

[0028] Figure 10 Fig. 5 is a schematic diagram of the driven wheel and valve connection of the present application;

[0029] Figure 11 Fig. 6 is a schematic diagram of the probe and air inlet relative position of the present application;

[0030] Figure 12 Fig. 7 is a schematic diagram of the probe and drive rod connection of the present application;

[0031] Figure 13 Fig. 8 is a schematic diagram of the probe and drive hole structure of the present application.

[0032] In the figure:

[0033] 1, production line main body; 2, rolling machine; 3, dust removal mechanism; 31, turntable; 32, chute; 33, sliding block; 34, tension spring; 35, magnet one; 36, limit plate; 37, moving rod; 38, screw sleeve; 39, telescopic rod; 310, magnet two; 311, air inlet; 312, rack; 313, valve; 314, driven wheel; 315, crossbar; 316, damping ring; 317, return spring; 318, wire; 319, probe; 320, drive hole; 321, knob; 322, pull rod; 323, drive rod. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] Example 1, refer to Figures 1-13For the first embodiment of the present application, a negative pressure air bellow type purification system applied to a round-to-round stamping production line is provided, which comprises a production line body 1, a rolling press 2 fixedly connected inside the production line body 1, and a dust removal mechanism 3 mounted on the outer side of the rolling press 2; the dust removal mechanism 3 comprises a rotating disc 31 fixedly connected symmetrically on the outer side of the rolling press 2, two rotating discs 31 respectively fixedly connected with different material rollers on the rolling press 2, a plurality of sliding grooves 32 arranged in an annular array on the side of the rotating disc 31 away from the rolling press 2, a sliding block 33 slidingly connected inside the sliding groove 32, a tension spring 34 fixedly connected on the side of the sliding block 33 close to the axis of the rotating disc 31, both ends of the tension spring 34 respectively fixedly connected with the sliding block 33 and the inner wall of the sliding groove 32, a magnet I 35 fixedly connected on the side of the sliding block 33 away from the rolling press 2, a limiting plate 36 fixedly connected symmetrically on the side of the rolling press 2 close to the rotating disc 31, a moving rod 37 commonly slidingly connected on the side of the two limiting plates 36 away from the rolling press 2, a screw sleeve 38 rotationally connected symmetrically on both ends of the moving rod 37, an extension rod 39 threadedly connected on the inner wall of the screw sleeve 38, a magnet II 310 fixedly connected on the end of the extension rod 39 close to the rotating disc 31, an air inlet 311 fixedly connected symmetrically on the inner side of the rolling press 2, a driving unit assembled in the middle of the moving rod 37, and an extension unit assembled inside the air inlet 311.

[0036] Specifically, after the stamping operation starts, the two material rollers on the rolling press 2 start to rotate, and the corresponding rotating discs 31 are driven to rotate at the same time. The rotating discs 31 generate centrifugal force while rotating, which makes the sliding block 33 move away from the axis of the rotating disc 31. The sliding track and range of the sliding block 33 are constrained by the sliding groove 32, and the sliding block 33 makes the tension spring 34 store energy while moving. The function of the tension spring 34 is to reset the sliding block 33 after the rotating disc 31 stops rotating. The sliding block 33 drives the magnet I 35 to move at the same time while moving. The magnet I 35 moves and pushes the magnet II 310 through magnetic force. The force of the magnet II 310 is transmitted to the extension rod 39. The extension rod 39 transmits the force to the moving rod 37 through the screw sleeve 38, which makes the moving rod 37 displace. The moving rod 37 can only move along the limiting plate 36 because it is constrained by the limiting plate 36. The air inlet 311 is connected to a negative pressure air source. After the stamping starts, the air inlet 311 inhales air, thereby inhaling aluminum powder and other impurities carried in the air.

[0037] With reference to Figure 6 The outer side of the extension rod 39 is provided with threads, and the screw sleeve 38 is provided with a screw hole along the axis, which is threadedly connected with the extension rod 39.

[0038] Specifically, the telescopic rod 39 can be moved along the axis of the screw sleeve 38 by rotating the screw sleeve 38, and the telescopic rod 39 moves together with the screw sleeve 38, so as to adjust the initial distance between the magnet one 35 and the magnet two 310. When the initial distance between the magnet one 35 and the magnet two 310 increases, the rotating disc 31 needs to reach a certain rotating speed to move the moving rod 37, and then the moving rod 37 controls the negative pressure air volume through the driving unit.

[0039] With reference to Figure 6 The limiting block is arranged on one side of the limiting plate 36 close to the moving rod 37, and the limiting slot is arranged at both ends of the moving rod 37 close to the limiting plate 36 and in sliding connection with the limiting block.

[0040] Specifically, the limiting plate 36 restricts the movement of the moving rod 37 in the water direction through the cooperation between the limiting block and the limiting slot.

[0041] With reference to Figures 1-13 The driving unit comprises the rack 312 fixedly connected to the moving rod 37 close to the middle part, the valve piece 313 rotatably connected to the inner wall of the air inlet 311, the driven wheel 314 fixedly connected to the valve piece 313 close to one side of the rotating disc 31, the cross rod 315 fixedly connected to the middle part of the moving rod 37, the damping ring 316 sleeved on the middle part of the cross rod 315, and the reset spring 317 sleeved on one end of the cross rod 315 away from the moving rod 37, and both ends of the reset spring 317 are fixedly connected with the damping ring 316 and the cross rod 315, respectively.

[0042] Specifically, after the moving rod 37 is driven by the magnet two 310, the rack 312 is displaced together, the rack 312 drives the driven wheel 314 to rotate, the driven wheel 314 drives the valve piece 313 to rotate, the valve piece 313 expands the air flow channel in the air inlet 311 after rotating, realizes the air volume control, and after the moving rod 37 is reset, the rack 312 also drives the valve piece 313 to reset through the driven wheel 314, the cross rod 315 is displaced synchronously with the moving rod 37, the cross rod 315 moves while the reset spring 317 is charged, when the cross rod 315 is not driven by the moving rod 37, the reset spring 317 continuously transmits the force to the cross rod 315 to reset the cross rod 315, the cross rod 315 is slowly reset under the action of the damping ring 316, the damping ring 316 makes the resistance of the cross rod 315 smaller when the cross rod 315 moves with the moving rod 37 and the resistance larger when the cross rod 315 is reset, through the slow resetting mechanism, the instability caused by the rapid displacement and reset of the moving rod 37 when different magnet ones 35 alternately interact with the magnet two 310 is prevented.

[0043] With reference to Figure 7The end of the cross rod 315 away from the moving rod 37 is provided with a stopper, the stopper is in abutment with a reset spring 317, the inner wall of a damping ring 316 is linearly provided with a plurality of rubber rings, and the inner edge of the rubber ring is inclined to the moving rod 37.

[0044] Specifically, the stopper provides a connection point for the reset spring 317, and the setting and inclination of the rubber ring can constrain the movement state of the cross rod 315.

[0045] Embodiment 2, refer to Figures 1-13 For the second embodiment of the application, which is different from the first embodiment: the telescopic unit includes guide wires 318 symmetrically and fixedly connected to the top and bottom of the air inlet 311, a plurality of probes 319 fixedly connected to the bottom ports of the guide wires 318, respectively, a driving hole 320 opened at the top of the probe 319, a knob 321 symmetrically and screwedly connected to the side of the rolling machine 2 close to the moving rod 37, a pull rod 322 rotationally connected to the outside of the knob 321, and a driving rod 323 symmetrically and fixedly connected to the two ends of the pull rod 322.

[0046] Specifically, when it is necessary to remove static electricity from dust, the pull rod 322 is moved by rotating the knob 321, and the driving rod 323 is moved at the same time, the driving rod 323 is displaced to press the driving hole 320 through the inclined rod to make the probe 319 extend out of the shell of the air inlet 311, then the guide wires 318 at the top and bottom of the air inlet 311 are connected to different voltages respectively, a high-voltage electric field is formed between the upper and lower probes 319, air ions are generated to neutralize the charges carried by the dust to eliminate static electricity, when it is not necessary to remove static electricity, the knob 321 is reversely rotated to make the pull rod 322 and the driving rod 323 retract the probe 319 into the shell of the air inlet 311, so that the probe 319 is stored to prevent dust from adhering to the probe 319.

[0047] Refer to Figures 1-9 The middle part and the end close to the rolling machine 2 of the knob 321 are provided with threads, the rolling machine 2 is adaptively threadedly connected with the two knobs 321, the middle part of the end of the pull rod 322 close to the moving rod 37 is provided with a circular hole, and the outer wall of the knob 321 is adaptively rotationally connected with the circular hole.

[0048] Specifically, the knob 321 will move along its own axis after being rotated, and rotating the knob 321 in different directions can control the direction of its linear movement, and the knob 321 drives the pull rod 322 to move at the same time, and the pull rod 322 can only move linearly with the knob 321 due to its own structure limitation and cannot rotate.

[0049] Refer to Figures 9-13The middle linear array of the driving rod 323 is provided with a plurality of inclined rods, the outer wall of the inclined rod is in sliding connection with the inner wall of the driving hole 320, and the air inlet 311 is provided with a rubber pad close to the plurality of probes 319.

[0050] Specifically, different inclined rods are arranged on the starting rod, each inclined rod is connected with a corresponding probe 319 through a different driving hole 320, when the inclined rod moves, the probe 319 moves in the up-down direction by extruding the driving hole 320, when the probe 319 extends, the rubber pad is extruded, and the probe 319 extends out of the air inlet 311 shell, after the probe 319 retracts, the rubber pad restores the original shape, the hole for extending and retracting the probe 319 is blocked, and dust is prevented from entering, and the remaining structure is the same as that of example 1.

[0051] In combination with examples 1-2, the working principle of the present application is as follows: after the gilding operation starts, the material roller on the rolling machine 2 drives the rotating disc 31 to rotate, the rotating disc 31 uses the centrifugal force to make the sliding block 33 overcome the elastic force of the tension spring 34 and slide outward, the sliding block 33 drives the magnet one 35 to move and push the magnet two 310 through the magnetic force, the magnet two 310 drives the moving rod 37 to move along the limiting plate 36 through the telescopic rod 39 and the screw sleeve 38, the moving rod 37 drives the driven wheel 314 to rotate through the rack 312, and then controls the valve plate 313 to rotate to adjust the opening of the air inlet 311, so that the negative pressure air volume dynamically changes with the rotating speed, at the same time, the moving rod 37 makes the return spring 317 store energy, when different magnet ones 35 alternately act on the magnet two 310, the damping ring 316 cooperates with the return spring 317 to make the cross rod 315 slowly reset, so as to ensure the stability of the moving rod 37, when it is necessary to remove static electricity, the knob 321 is rotated to drive the pull rod 322 to move linearly, the pull rod 322 extrudes the driving hole 320 through the driving rod 323 and the inclined rod, the probe 319 is pushed out and passes through the rubber pad, at this time, the upper and lower wires 318 are connected to different voltages to form a high-voltage electric field for the opposite probe 319 to ionize air to neutralize dust charge, when the static electricity removing function is not used, the knob 321 is reversely rotated, so that the probe 319 is retracted into the air inlet 311 shell through the inclined rod, the rubber pad resets to block the hole, and dust adhesion is prevented from affecting the performance.

[0052] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limited, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A negative pressure air bellow type purification system applied to a round-to-round gilding production line, comprising a production line body (1) and a rolling press (2) arranged inside the production line body (1), characterized in that: Further include the dust removal mechanism (3) set outside the rolling machine (2); The dust removal mechanism (3) includes the turntable (31) symmetrically arranged outside the rolling machine (2), two turntables (31) are fixedly connected with different material rollers on the rolling machine (2) respectively, a plurality of annular array openings are arranged on the chute (32) on the side away from the rolling machine (2) of the turntable (31), the sliding block (33) is arranged in the chute (32), the tension spring (34) is arranged on the side close to the axis of the turntable (31) of the sliding block (33), the two ends of the tension spring (34) are fixedly connected with the sliding block (33) and the inner wall of the chute (32) respectively, the magnet one (35) is arranged on the side away from the rolling machine (2) of the sliding block (33), the limiting plate (36) is symmetrically arranged on the side close to the turntable (31) of the rolling machine (2), the moving rod (37) is arranged on the side away from the rolling machine (2) of the two limiting plates (36), the screw sleeve (38) is symmetrically arranged on the two ends of the moving rod (37), the telescopic rod (39) is arranged on the inner wall of the screw sleeve (38), the magnet two (310) is arranged on the end close to the turntable (31) of the telescopic rod (39), the air inlet (311) is symmetrically arranged on the inner side of the rolling machine (2), the driving unit for controlling the air inlet (311) air duct opening and closing is arranged on the middle part of the moving rod (37), and the telescopic unit for starting and closing the static electricity removal function is arranged in the air inlet (311). The telescopic unit includes the wires (318) symmetrically arranged on the top and bottom of the air inlet (311), a plurality of probes (319) arranged on the bottom port of the wire (318) respectively, the driving hole (320) arranged on the top of the probe (319), the knob (321) symmetrically arranged on the side close to the moving rod (37) of the rolling machine (2), the pull rod (322) arranged on the outer side of the knob (321), and the driving rod (323) symmetrically arranged on the two ends of the pull rod (322).

2. The negative pressure bellows type purification system applied to a round-to-round gilding production line according to claim 1, characterized in that: The outer side of the telescopic rod (39) is provided with a thread, the screw sleeve (38) is provided with a screw hole along the axis, and the screw hole is connected with the telescopic rod (39) in screw thread.

3. The negative pressure bellows type purification system applied to a round-to-round gilding production line according to claim 1, characterized in that: The side close to the moving rod (37) of the limiting plate (36) is provided with a limiting block, the limiting slot is arranged on the ends close to the limiting plate (36) of the moving rod (37), and the limiting slot is connected with the limiting block in sliding mode.

4. The negative pressure bellows type purification system applied to a round-to-round gilding production line according to claim 1, characterized in that: The driving unit includes the rack (312) symmetrically arranged on the side close to the middle part of the moving rod (37), the valve plate (313) arranged on the inner wall of the air inlet (311), the driven wheel (314) arranged on the side close to the turntable (31) of the valve plate (313), the driven wheel (314) is meshed and connected with the corresponding rack (312), the cross rod (315) is arranged on the middle part of the moving rod (37), the damping ring (316) is arranged on the middle part of the cross rod (315), and the reset spring (317) is sleeved on the end away from the moving rod (37) of the cross rod (315), the two ends of the reset spring (317) are fixedly connected with the damping ring (316) and the cross rod (315) respectively.

5. The negative pressure bellows type purification system applied to a round-to-round gilding production line according to claim 4, characterized in that: The cross rod (315) is provided with a stopper at one end away from the moving rod (37), the stopper abuts against a reset spring (317), the inner wall of a damping ring (316) is linearly provided with a plurality of rubber rings, and the inner edge of the rubber ring is inclined to the moving rod (37).

6. The negative pressure bellows type purification system applied to a round-to-round gilding production line according to claim 1, characterized in that: The middle part and the end close to the rolling machine (2) of the knob (321) are provided with threads, the rolling machine (2) is adaptively connected with the two knobs (321) through threads, the middle part of the pull rod (322) close to the moving rod (37) is provided with a circular hole, and the outer wall of the knob (321) is adaptively connected with the circular hole through rotation.

7. The negative pressure bellows type purification system applied to a round-to-round gilding production line according to claim 1, characterized in that: The middle part of the driving rod (323) is linearly provided with a plurality of inclined rods, the outer wall of the inclined rod is slidably connected with the inner wall of the driving hole (320), and the air inlet (311) is provided with a rubber pad close to the plurality of probes (319).

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