Potentiometer testing device

Abstract

The utility model discloses a potentiometer testing device, which relates to the technical field of potentiometers, and comprises a conveying channel, a feeding port, a discharging port and a containing port, the pneumatic assembly is used for blowing air to the potentiometers so that the potentiometers can move along the conveying channel; the number of the pneumatic assemblies is at least two. The preparation position and the test position are provided with pneumatic assemblies. The limiting assembly is used for limiting or loosening the potentiometer in the conveying channel; the test assembly is used for contacting or loosening a pin of the potentiometer so as to test the electrical characteristics of the potentiometer; the testing assembly is located at the testing position; the screening assembly communicates with the discharging opening and is used for screening qualified potentiometers according to preset electrical characteristics; the pneumatic assembly, the limiting assembly, the testing assembly and the screening assembly are all electrically connected with the control system. The potentiometer testing device can automatically test the electrical characteristics of batch potentiometers, and is simple to operate and high in working efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of potentiometers, in particular to a potentiometer testing device. Background Art

[0002] A potentiometer is a resistor element with three terminals and whose resistance value can be adjusted according to a certain law of change. After the potentiometer is manufactured, its resistance needs to be tested. The test method is generally as follows: a worker uses a multimeter to touch the terminals of the potentiometer and then reads the resistance value of the potentiometer. The entire test process is manually operated.

[0003] Since the potentiometer is small in size, batches of potentiometers need to be tested during testing, and manual testing of the potentiometer is cumbersome, time-consuming and laborious. The prior art lacks a device that can automatically test batches of potentiometers. Utility Model Content

[0004] The main purpose of the utility model is to provide a potentiometer testing device, aiming to solve the technical problem that the prior art lacks a device capable of automatically testing batches of potentiometers.

[0005] To achieve the above object, the utility model provides a potentiometer testing device, comprising:

[0006] A conveying channel, wherein the conveying channel has a feed port, a discharge port and a receiving port which are interconnected, wherein the receiving port is located at the side of the conveying channel and is used for the pins of the potentiometer to extend out; the conveying channel is provided with a preparation position and a test position;

[0007] A pneumatic assembly, used for blowing air to the potentiometer so that the potentiometer moves along the conveying channel; the number of the pneumatic assemblies is at least two; the preparatory position and the test position are both provided with the pneumatic assembly;

[0008] A limiting component, used for limiting or releasing the potentiometer in the conveying channel;

[0009] A test component, used for contacting or releasing the pins of the potentiometer to test the electrical characteristics of the potentiometer; the test component is located at the test position;

[0010] A screening component, the screening component is communicated with the discharge port and is used to screen qualified potentiometers according to preset electrical characteristics;

[0011] Control system; the pneumatic component, the limit component, the test component and the screening component are all electrically connected to the control system.

[0012] Optionally, the pneumatic component includes an air pipe and an air pump; the air pump is electrically connected to the control system; one end of the air pipe is connected to the air pump, and the other end of the air pipe is a free end and is connected to the receiving port.

[0013] Optionally, the limit assembly includes an electric push rod; the conveying channel is provided with a mounting hole which is perpendicular to the extension direction of the conveying channel; the electric push rod cooperates with the mounting hole; the electric push rod is used to limit or release the potentiometer from the feed port to the discharge port.

[0014] Optionally, the test assembly includes a first moving mechanism, a conductive member and a tester; the tester is used to test the electrical characteristics of the potentiometer; the conductive member is electrically connected to the tester; and the first moving mechanism is used to drive the conductive member to contact or move away from the pin of the potentiometer.

[0015] Optionally, the conductive part includes a first slider and a contact; the first slider is provided with a slot, and the contact is located at the bottom of the slot; the first moving mechanism is used to drive the first slider to move so that the slot engages or disengages from the pin of the potentiometer, and the pin of the potentiometer can abut against the contact.

[0016] Optionally, it also includes a second moving mechanism and a second slider connected to each other; the first slider and the second slider are respectively located on both sides of the extension direction of the conveying channel; the second slider is provided with a card block that cooperates with the card slot.

[0017] Optionally, the screening component includes a screening channel and a sealing mechanism; one end of the screening channel is connected to the discharge port, and the other end of the screening channel is a first screening port; the screening channel is provided with a second screening port, and the potentiometer can be discharged from the second screening port under the action of gravity; the sealing mechanism is electrically connected to the control system, and the sealing mechanism is used to seal the second screening port.

[0018] The technical solution of the utility model proposes a potentiometer testing device, wherein a plurality of potentiometers are arranged in the same posture and enter a conveying channel from a feed port; a pneumatic component drives the potentiometer to move along the conveying channel, a limit component stops the potentiometer at a preparatory position, a control system controls the limit component to release the first potentiometer, and the pneumatic component blows the first potentiometer to a test position, at which time the limit component limits the first potentiometer at the test position, and the limit component limits the second potentiometer at the preparatory position; when the test component completes the test on the first potentiometer, the test component sends the test result of the first potentiometer to the control system, the control system compares the test result with a preset electrical characteristic to determine whether the potentiometer is qualified, and screens the qualified potentiometers through a screening component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a potentiometer testing device according to an embodiment of the utility model;

[0021] Figure 2 Another structural schematic diagram of the potentiometer testing device according to the embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the card block and the card slot in the embodiment of the utility model;

[0023] Figure 4 It is a schematic diagram of the structure of the potentiometer according to an embodiment of the utility model.

[0024] Icons: 10, conveying channel; 101, feed port; 102, discharge port; 103, receiving port; 104, mounting hole; 105, positioning hole; 20, pneumatic component; 30, limit component; 310, electric push rod; 320, positioning member; 40, test component; 410, first moving mechanism; 420, conductive member; 4210, first slider; 42101, slot; 4220, contact; 430, tester; 510, screening channel; 5101, first screening port; 5102, second screening port; 521, cover; 60, potentiometer; 610, pin; 620, adjustment cap; 70, workbench; 810, second moving mechanism; 820, second slider; 8210, card block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in 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.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0029] refer to Figure 1-Figure 4 A potentiometer testing device comprises: a conveying channel 10, the conveying channel 10 has a feed port 101, a discharge port 102 and a receiving port 103 which are interconnected, the receiving port 103 is located at the side of the conveying channel 10 and is used for the pin 610 of the potentiometer 60 to extend; the conveying channel 10 is provided with a preparation position and a test position; a pneumatic component 20, which is used for blowing air to the potentiometer 60 so that the potentiometer 60 moves along the conveying channel 10; the number of the pneumatic components 20 is at least two; the preparation position and the test position are both provided with pneumatic Component 20; a limit component 30, used for limiting or releasing the potentiometer 60 in the conveying channel 10; a test component 40, used for contacting or releasing the pin 610 of the potentiometer 60 to test the electrical characteristics of the potentiometer 60; the test component 40 is located at the test position; a screening component, the screening component is connected to the discharge port 102 and is used to screen qualified potentiometers 60 according to preset electrical characteristics; a control system; the pneumatic component 20, the limit component 30, the test component 40 and the screening component are all electrically connected to the control system.

[0030] A plurality of potentiometers 60 are arranged in the same posture and enter the conveying channel 10 from the feed port 101; the pneumatic component 20 drives the potentiometer 60 to move along the conveying channel 10, and the limit component 30 stops the potentiometer 60 at the preparation position, and the control system controls the limit component 30 to release the first potentiometer 60, and the pneumatic component 20 blows the first potentiometer 60 to the test position. At this time, the limit component 30 limits the first potentiometer 60 to the test position, and the limit component 30 limits the second potentiometer 60 to the preparation position; when the test component 40 completes the test of the first potentiometer 60, the test component 40 sends the test result of the first potentiometer 60 to the control system, and the control system compares the test result with the preset electrical characteristics to determine whether the potentiometer 60 is qualified, and screens the qualified potentiometers 60 through the screening component.

[0031] The preparation position is close to the feed port 101 of the conveying channel 10 , and the test position is close to the discharge port 102 .

[0032] In some embodiments, the number of pins 610 of the potentiometer 60 may be three and arranged in a triangle shape. The portion of the potentiometer 60 other than the pins 610 is in a rectangular parallelepiped shape, and the end of the potentiometer 60 away from the pins 610 has an adjustment cap 620. When the potentiometer 60 is placed in the conveying channel 10, the adjustment cap 620 abuts against the side wall of the conveying channel 10, that is, the side wall of the conveying channel 10 relative to the receiving port 103.

[0033] In some embodiments, the conveying channel 10 , the pneumatic component 20 , the limiting component 30 , the testing component 40 , the screening component and the control system can all be disposed on the workbench 70 .

[0034] The conveying channel 10 may be in the shape of a rectangular parallelepiped as a whole, and the cross section of the conveying channel 10 may be U-shaped. When the conveying channel 10 is placed on the workbench 70, the receiving opening 103 of the conveying channel 10 is oriented parallel to the plane of the workbench 70. In some embodiments, the extending direction of the conveying channel 10 may be parallel to the workbench 70. In other embodiments, the extending direction of the conveying channel 10 may also be arranged at a certain angle to the workbench 70, and the feed opening 101 is located above the discharge opening 102.

[0035] The conveying channel 10 may be made of metal material, so that the conveying channel 10 has high strength and a relatively smooth surface, so that the potentiometer 60 can slide in the conveying channel 10 .

[0036] It should be noted that the multiple potentiometers 60 can be manually sorted before entering the conveying channel 10; or the multiple potentiometers 60 can be automatically sorted into a row using a sorting device. The sorting device is a prior art, such as the invention patent with publication number CN106710761A, a potentiometer assembly machine, and the vibration disk disclosed therein is the sorting device.

[0037] The power supply of the potentiometer testing device can be an external AC power supply or a mobile power supply, and the power supply can be selected according to needs.

[0038] As an optional embodiment, the pneumatic component 20 includes an air pipe and an air pump; the air pump is electrically connected to the control system; one end of the air pipe is connected to the air pump, and the other end of the air pipe is a free end and connected to the receiving port 103.

[0039] In this embodiment, the air pump can be arranged on the workbench 70, and the air delivery pipe can be a metal pipe with deformation ability, such as a copper pipe. The air delivery pipe is bent as needed so that the end of the air delivery pipe faces the receiving port 103. The tangent direction of the end of the air delivery pipe can be arranged at an angle with the extension direction of the delivery channel 10. For example, the delivery channel 10 is placed horizontally on the workbench 70, and the air delivery pipe extends obliquely downward from the top of the delivery channel 10 toward the inside of the delivery channel 10, so that the gas blown out of the air delivery pipe can drive the potentiometer 60 to slide in the delivery channel 10.

[0040] As an optional implementation, refer to Figure 1 and Figure 2 The limit assembly 30 includes an electric push rod 310; the conveying channel 10 is provided with a mounting hole 104 which is perpendicular to the extending direction of the conveying channel 10; the electric push rod 310 cooperates with the mounting hole 104; the electric push rod 310 is used to limit or release the potentiometer 60 from the feed port 101 to the discharge port 102.

[0041] In this embodiment, one end of the electric push rod 310 is fixed on the workbench 70, and the other end of the electric push rod 310 has a telescopic rod and the telescopic rod cooperates with the mounting hole 104. When the telescopic rod extends from the mounting hole 104 into the inner side of the conveying channel 10, the side wall of the telescopic rod abuts against the side of the potentiometer 60 close to the discharge port 102, thereby limiting the movement of the potentiometer 60. At this time, the side of the potentiometer 60 away from the discharge port 102 is close to the air supply pipe of the pneumatic component 20.

[0042] The number of the limiting components 30 is the same as the number of the pneumatic components 20 .

[0043] As an optional implementation, refer to Figure 1 The limiting assembly 30 also includes a positioning member 320; the conveying channel 10 is provided with a positioning hole 105 which is perpendicular to the extending direction of the conveying channel 10; the axis of the positioning hole 105 intersects perpendicularly with the axis of the mounting hole 104; one end of the positioning member 320 is fixed on the workbench 70, and the other end of the positioning member 320 cooperates with the positioning hole 105 and can move along the positioning hole 105; the positioning member 320 has the ability to extend or shorten. The positioning member 320 can be a cylinder rod, a hydraulic rod, an electric push rod, etc. The positioning member 320 can be located above the conveying channel 10.

[0044] When the potentiometers 60 are arranged to enter the conveying channel 10, the adjacent potentiometers 60 abut against each other. The electric push rod 310 limits the movement of the first potentiometer 60 along the conveying channel 10, and the positioning member 320 passes through the positioning hole 105 and abuts against the side wall of the second potentiometer 60 to limit the movement of the second potentiometer 60; at this time, after the electric push rod 310 moves away from the conveying channel 10 along the mounting hole 104, the pneumatic component 20 blows air toward the first potentiometer 60, and the first potentiometer 60 slides along the conveying channel 10 under the force, and the second potentiometer 60 remains stationary under the action of the positioning member 320, and the rear potentiometer 60 is limited by the second potentiometer 60. After the test of the first potentiometer 60 is completed, the electric push rod 310 is inserted into the conveying channel 10 again along the mounting hole 104, and the positioning piece 320 releases the second potentiometer 60. The second potentiometer 60 and the rear potentiometer 60 move along the conveying channel 10. At this time, the second potentiometer 60 abuts against the electric push rod 310, and the positioning piece 320 is inserted into the conveying channel 10 along the positioning hole 105 and abuts against the third potentiometer 60, thereby realizing the reciprocating movement of the potentiometers 60 one by one.

[0045] The main function of the positioning member 320 is to prevent the next potentiometer 60 from sliding along the conveying channel 10 due to the influence of the pneumatic component 20 when the pneumatic component 20 blows the previous potentiometer 60 .

[0046] As an optional implementation, refer to Figure 1 and Figure 2 The test assembly 40 includes a first moving mechanism 410, a conductive member 420 and a tester 430; the tester 430 is used to test the electrical characteristics of the potentiometer 60; the conductive member 420 is electrically connected to the tester 430; the first moving mechanism 410 is used to drive the conductive member 420 to contact or move away from the pin 610 of the potentiometer 60.

[0047] In this embodiment, the pin 610 of the potentiometer 60 extends out of the receiving opening 103, and the conductive member 420 and the first moving mechanism 410 are both located on the side of the conveying passage 10. When the potentiometer 60 moves to the testing position, the limiting assembly 30 limits the potentiometer 60, and at this time, the first moving mechanism 410 drives the conductive member 420 to move toward the potentiometer 60, and finally the conductive member 420 contacts the pin 610 of the potentiometer 60, and then the potentiometer 60 is tested by the tester 430.

[0048] The first moving mechanism 410 may be an electric push rod, a cylinder rod, a hydraulic rod, a screw motor, etc. The direction in which the first moving mechanism 410 drives the conductive member 420 to move may be perpendicular to the moving direction of the electric push rod 310 .

[0049] The electrical characteristics include the resistance of the potentiometer 60 ; the conductive member 420 is in contact with the three pins 610 of the potentiometer 60 at the same time, and a corresponding circuit can be set between the conductive member 420 and the tester 430 so that the tester 430 can connect any two of the three pins 610 to test the resistance of the potentiometer 60 .

[0050] As an optional implementation, refer to Figure 1-Figure 3 The conductive member 420 includes a first slider 4210 and a contact 4220; the first slider 4210 is provided with a slot 42101, and the contact 4220 is located at the bottom of the slot 42101; the first moving mechanism 410 is used to drive the first slider 4210 to move so that the slot 42101 is engaged with or disengaged from the pin 610 of the potentiometer 60, and the pin 610 of the potentiometer 60 can abut against the contact 4220.

[0051] The number of the slots 42101 is the same as the number of the pins 610 of the potentiometer 60. In some embodiments, the first moving mechanism 410 and the first slider 4210 are located below the conveying channel 10, the openings of the slots 42101 face upward, one of the slots 42101 is shallower, and the other two slots 42101 are deeper; the first moving mechanism 410 drives the first slider 4210 to move from bottom to top, so that the contact 4220 contacts the pins 610 of the potentiometer 60. It should be noted that the gap between the upper end surface of the potentiometer 60 and the conveying channel 10 can be set to a smaller value to prevent the first slider 4210 from driving the potentiometer 60 to move upward.

[0052] In other embodiments, the first moving mechanism 410 and the first slider 4210 are located above the conveying channel 10, and the opening of the slot 42101 faces downward, one of the slots 42101 is deeper, and the other two slots 42101 are shallower; the first moving mechanism 410 drives the first slider 4210 to move from top to bottom, so that the contact 4220 contacts the pin 610 of the potentiometer 60.

[0053] As an optional implementation, refer to Figure 1 and Figure 2 , and also includes a second moving mechanism 810 and a second slider 820 connected to each other; the first slider 4210 and the second slider 820 are respectively located on both sides of the extension direction of the conveying channel 10; the second slider 820 is provided with a card block 8210 that cooperates with the card slot 42101.

[0054] In this embodiment, the first moving mechanism 410 and the first slider 4210 are located below the conveying channel 10, and the opening of the card slot 42101 faces upward. The second moving mechanism 810 and the second slider 820 are located above the conveying channel 10. The second moving mechanism 810 can be fixed on the workbench 70 (the connection structure between the second moving mechanism 810 and the workbench 70 is not shown in the figure). The second moving mechanism 810 drives the second slider 820 to move from top to bottom. The first slider 4210 and the second slider 820 clamp the potentiometer 60 from both sides, so that the contact 4220 is in close contact with the pin 610 of the potentiometer 60.

[0055] In this embodiment, the cross-section of the slot 42101 and the block 8210 can be V-shaped. The V-shaped slot facilitates the embedding of the pin 610 of the potentiometer 60. In addition, the V-shaped slot has a shaping effect on the pin 610 of the potentiometer 60, so that the position of the pin 610 of each potentiometer 60 can be more uniform so that the contact 4220 can contact the pin 610.

[0056] As an optional implementation, refer to Figure 1 The screening component includes a screening channel 510 and a sealing mechanism; one end of the screening channel 510 is connected to the discharge port 102, and the other end of the screening channel 510 is a first screening port 5101; the screening channel 510 is provided with a second screening port 5102, and the potentiometer 60 can be discharged from the second screening port 5102 under the action of gravity; the sealing mechanism is electrically connected to the control system, and the sealing mechanism is used to seal the second screening port 5102.

[0057] In this embodiment, after the test component 40 completes the test of the potentiometer 60 at the test position, the limit component 30 at the test position releases the potentiometer 60, the pneumatic component 20 blows air to the potentiometer 60, and the potentiometer 60 enters the screening channel 510 from the discharge port 102. If the electrical characteristics of the potentiometer 60 are qualified, the control system controls the sealing mechanism to seal the second screening port 5102, and the potentiometer 60 is discharged from the first screening port 5101; if the electrical characteristics of the potentiometer 60 are unqualified, the control system controls the sealing mechanism to open the second screening port 5102, and the potentiometer 60 is discharged from the second screening port 5102.

[0058] In this embodiment, the sealing mechanism includes a cover plate 521 and a sealing motor; one end of the cover plate 521 is hinged to the screening channel 510, and the other end of the cover plate 521 is a free end; the sealing motor is arranged on the screening channel 510 and is used to drive the cover plate 521 to rotate around the screening channel 510, and the sealing motor can be a steering gear. When the cover plate 521 seals the second screening port 5102, the cover plate 521 is flush with the inner wall of the screening channel 510, so that the potentiometer 60 will not collide when sliding along the screening channel 510, so that the potentiometer 60 can smoothly reach the first screening port 5101.

[0059] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A potentiometer testing device, characterized in that: include: A conveying channel, wherein the conveying channel has a feed port, a discharge port and a receiving port which are interconnected, wherein the receiving port is located at the side of the conveying channel and is used for the pins of the potentiometer to extend out; the conveying channel is provided with a preparation position and a test position; A pneumatic assembly, used for blowing air to the potentiometer so that the potentiometer moves along the conveying channel; the number of the pneumatic assemblies is at least two; the preparatory position and the test position are both provided with the pneumatic assembly; A limiting component, used for limiting or releasing the potentiometer in the conveying channel; A test component, used for contacting or releasing the pins of the potentiometer to test the electrical characteristics of the potentiometer; the test component is located at the test position; A screening component, the screening component is communicated with the discharge port and is used to screen qualified potentiometers according to preset electrical characteristics; Control systems; The pneumatic component, the limit component, the test component and the screening component are all electrically connected to the control system.

2. The potentiometer testing device according to claim 1, characterized in that: The pneumatic assembly includes an air pipe and an air pump; the air pump is electrically connected to the control system; one end of the air pipe is connected to the air pump, and the other end of the air pipe is a free end and communicates with the receiving port.

3. The potentiometer testing device according to claim 1, characterized in that: The limit assembly includes an electric push rod; the conveying channel is provided with a mounting hole which is perpendicular to the extension direction of the conveying channel; the electric push rod cooperates with the mounting hole; the electric push rod is used to limit or release the potentiometer from the feed port to the discharge port.

4. The potentiometer testing device according to claim 1, characterized in that: The test assembly includes a first moving mechanism, a conductive member and a tester; the tester is used to test the electrical characteristics of the potentiometer; the conductive member is electrically connected to the tester; the first moving mechanism is used to drive the conductive member to contact or move away from the pin of the potentiometer.

5. The potentiometer testing device according to claim 4, characterized in that: The conductive member includes a first slider and a contact; the first slider is provided with a slot, and the contact is located at the bottom of the slot; the first moving mechanism is used to drive the first slider to move so that the slot engages with or disengages from the pin of the potentiometer, and the pin of the potentiometer can abut against the contact.

6. The potentiometer testing device according to claim 5, characterized in that: It also includes a second moving mechanism and a second sliding block connected to each other; the first sliding block and the second sliding block are respectively located on both sides of the extension direction of the conveying channel; the second sliding block is provided with a clamping block that cooperates with the clamping slot.

7. The potentiometer testing device according to claim 1, characterized in that: The screening assembly includes a screening channel and a sealing mechanism; one end of the screening channel is connected to the discharge port, and the other end of the screening channel is a first screening port; the screening channel is provided with a second screening port, and the potentiometer can be discharged from the second screening port under the action of gravity; The sealing mechanism is electrically connected to the control system, and the sealing mechanism is used to seal the second screening port.

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