A side plate cap pressing device for a packaging box

Abstract

The present invention discloses a cap pressing device for a side plate of a packaging box, comprising a cap pressing mechanism and a feeding mechanism; the cap pressing mechanism comprises a chassis, a working platform is arranged on the top surface of the chassis, a first side plate is symmetrically installed on the left and right sides of the working platform, a first beam, a second beam and a third beam are installed between the two first side plates, the first beam is arranged in parallel with the second beam, the third beam is located directly above the second beam, a chute is arranged between the first beam and the second beam, a material pushing slider is arranged at one end of the chute, a material pushing cylinder is installed on the first side plate, the telescopic end of the material pushing cylinder is connected to the material pushing slider, a material dropping port is opened on the working platform outside the other end of the chute, a material pressing mechanism is installed on the first beam corresponding to the chute, and a cap pressing assembly is correspondingly installed on the third beam. The present invention can realize the automatic assembly of the cap pressing on the top of the side plate of the packaging box.

Description

Technical Field

[0001] The invention belongs to the technical field of product processing, and in particular relates to a side plate cap pressing device for a packaging box. Background Art

[0002] With the rapid development of my country's economy, various production and living materials are highly abundant. Fruits and vegetables from different regions need to be transported to different regions for sale, so a large number of packaging boxes are needed. Most of the packaging boxes in the prior art are made of paper, which is easy to be crushed and not very convenient to pack. In order to solve this technical problem, a packaging box with a side panel made of plastic has appeared on the market. The side panel 50 is as follows: Figure 1 and Figure 2 As shown, a pressing cap 51 needs to be installed on both sides of the top of the side plate 50. The pressing cap 51 is used to connect with the top surface of the packaging box. Currently, the pressing cap is assembled manually, which is very inefficient and causes excessively high production costs.

[0003] Therefore, how to solve the defects of the above-mentioned prior art has become the direction of efforts of technicians in this field. Summary of the invention

[0004] The purpose of the present invention is to provide a packaging box side plate cap pressing device, which can completely solve the shortcomings of the above-mentioned prior art.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A packaging box side plate cap pressing device, comprising a cap pressing mechanism and a feeding mechanism;

[0007] The cap pressing mechanism includes a base frame, a working platform is arranged on the top surface of the base frame, first side plates are symmetrically installed on the left and right sides of the working platform, a first beam, a second beam and a third beam are installed between the two first side plates, the first beam is arranged in parallel with the second beam, the third beam is located directly above the second beam, a slide groove is arranged between the first beam and the second beam, a pushing slider is arranged at one end of the slide groove, a pushing cylinder is installed on the first side plate, the telescopic end of the pushing cylinder is connected to the pushing slider, a blanking port is opened on the working platform outside the other end of the slide groove, a pressing mechanism is installed on the first beam corresponding to the slide groove, and a cap pressing assembly is installed on the third beam correspondingly;

[0008] The material pressing mechanism comprises a three-axis guide cylinder A and a material pressing positioning block, wherein the three-axis guide cylinder A is fixed on the first crossbeam, and the material pressing positioning block is installed at the telescopic end of the three-axis guide cylinder A;

[0009] The cap pressing assembly includes a three-axis guide cylinder B, a first finger cylinder, a second finger cylinder, a horizontal fixing plate and a vertical fixing plate. The three-axis guide cylinder B is vertically fixed on the third crossbeam, the horizontal fixing plate is fixed on the telescopic end of the three-axis guide cylinder B, the vertical fixing plate is installed on the bottom surface of the horizontal fixing plate, the first finger cylinder and the second finger cylinder are correspondingly fixed on the front and back of the vertical fixing plate, a plastic cap hook is installed on the output end of the first finger cylinder, and a supporting part for supporting the plastic cap is provided on the plastic cap hook, a plastic cap clamp is installed on the output end of the second finger cylinder, and a clamping part for clamping the plastic cap is provided on the plastic cap clamp, and the supporting part of the plastic cap hook is located above the clamping part of the plastic cap clamp; a sensing probe A is provided in the slide groove, and a sensing probe B is provided above the plastic cap hook;

[0010] A material receiving track is installed on the second crossbeam corresponding to the plastic cap hook piece, and the feeding mechanism includes a bracket, a vibration motor is installed on the bracket, and a hopper is installed on the vibration motor. The discharge port of the hopper is connected to the material receiving track through the feeding track, and the material receiving track is connected to the supporting part of the plastic cap hook piece;

[0011] A control box is arranged on the bottom frame, and a controller is installed in the control box. The push cylinder, three-axis guide cylinders A and B, induction probes A and B, the first finger cylinder, the second finger cylinder and the vibration motor are all connected to the controller.

[0012] Furthermore, baffles are provided below the first cross beam and the second cross beam, and the bottoms of the two baffles are connected by a bottom plate to form a slide groove.

[0013] Furthermore, an aluminum profile is fixed on the working platform below the base plate, and a positioning mechanism is fixed on the aluminum profile. The positioning mechanism includes a spring sheet, a bearing seat and a bearing. One end of the spring sheet is fixed on the aluminum profile, and the other end is a free end, and a bearing seat is installed on it. The bearing is installed on the bearing seat, and a mounting hole is opened on the base plate, and the upper part of the bearing is exposed from the mounting hole.

[0014] Furthermore, a feeding mechanism is installed on the outer side of the material receiving track near the plastic cap clamp.

[0015] Furthermore, a limit bar is provided directly above the material receiving track, and the limit bar is arranged along the material receiving track. A plurality of limit fixing blocks are installed on the material receiving track, and screws are installed on the top of the limit fixing blocks. The bottom end of the screw is connected to the limit bar through a spring.

[0016] Furthermore, a knocking block is installed on the vertical fixing plate corresponding to the plastic cap clamp.

[0017] Furthermore, an inclined plate is provided at the connection between the discharge port and the feeding track, and the inclined plate is inclined toward one side of the feeding track.

[0018] Furthermore, a limit rod is provided just above the feeding track, and the limit rod is arranged along the feeding track. The feeding track and the limit rod are both fixed to the hopper through a track connecting block.

[0019] Furthermore, the hopper includes an inner cylinder and an outer cylinder, the bottom of the inner cylinder is an inverted cone, the bottom of the outer cylinder is connected to the inner cylinder through a bottom surface inclined toward the inner cylinder, and an opening communicating with the bottom of the outer cylinder is provided at the bottom of the inner cylinder.

[0020] Furthermore, a spiral track is arranged on the inner wall of the inner cylinder from the bottom to the top, and a dividing strip is arranged on the top surface of the spiral track, thereby dividing the spiral track into two parts, and the two parts are respectively connected to the conveying track.

[0021] Compared with the prior art, the beneficial effects of the present invention are: reasonable structural design, capable of realizing the automatic assembly of the top pressure cap of the side plate of the packaging box, greatly improving the work efficiency and effectively reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the side panel of the packaging box;

[0023] Figure 2 This is a bottom view of the side panel of the packaging box;

[0024] Figure 3 is a front view of the present invention;

[0025] Figure 4 It is a right side view of the present invention;

[0026] Figure 5 is a top view of the present invention;

[0027] Figure 6 yes Figure 5 A partial enlarged view of the middle A;

[0028] Figure 7 It is a schematic diagram of the structure of the hopper;

[0029] Figure 8 It is a structural diagram of the limiting mechanism;

[0030] Fig. 9 This is a schematic diagram of the installation structure of the limit mechanism Figure 1 ;

[0031] Fig.10 This is a schematic diagram of the installation structure of the limit mechanism Figure 2 ;

[0032] Fig.11 It is a position relationship diagram between the material receiving track, the limit strip and the limit fixing block;

[0033] Fig.12 is a front view of the pressure cap assembly;

[0034] Fig.13 It is the right side view of the pressure cap assembly;

[0035] Fig.14 It is the left side view of the pressure cap assembly;

[0036] Fig.15 Schematic diagram of the installation structure of the induction probe B;

[0037] Fig.16 It is a connection diagram of the first finger cylinder and the plastic cap hook;

[0038] Fig.17 is a diagram showing the positional relationship between the plastic cap fixture and the striking block, wherein the first finger cylinder and the vertical fixing plate are not shown;

[0039] Fig.18 This is a state diagram when the plastic cap has not entered the plastic cap hook;

[0040] Fig.19 It is a state diagram when the plastic cap is supported by the plastic cap hook;

[0041] Fig. 20 It is a state diagram when the plastic cap is clamped by the plastic cap clamp;

[0042] Fig.21 This is a state diagram after the cap pressing is completed, with the plastic cap hook and the plastic cap clamp both opened;

[0043] Fig. 22 It is the state diagram of the plastic cap in the feeding track;

[0044] Fig.23 It is a schematic diagram of the structure of the side panel of the packaging box before positioning;

[0045] Fig.24 It is a schematic diagram of the structure of the side panels of the packaging box after positioning. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with specific embodiments and drawings.

[0047] like Figures 3 to 24 As shown, a packaging box side plate cap pressing device includes a cap pressing mechanism and a feeding mechanism.

[0048] The cap pressing mechanism includes a base frame 1, a working platform 2 is arranged on the top surface of the base frame 1, a first side plate 3 is symmetrically installed on the left and right sides of the working platform 2, a first crossbeam 4, a second crossbeam 5 and a third crossbeam 6 are installed between the two first side plates 3, the first crossbeam 4 is arranged parallel to the second crossbeam 5, the third crossbeam 6 is located directly above the second crossbeam 5, a slide groove 7 is arranged between the first crossbeam 4 and the second crossbeam 5, specifically, baffles are arranged under the first crossbeam 4 and the second crossbeam 5, and the bottoms of the two baffles are connected by a bottom plate 8 to form a U-shaped slide groove.

[0049] An aluminum profile 9 is fixed on the working platform 2 below the base plate 8, and two positioning mechanisms are fixed on the aluminum profile 9, which include a spring sheet 10, a bearing seat 11 and a bearing 12. One end of the spring sheet 10 is fixed on the aluminum profile 9, and the other end is a free end, on which the bearing seat 11 is mounted. The bearing 12 is mounted on the bearing seat 11, and a mounting hole 13 is opened on the base plate 8, and the upper part of the bearing 12 is exposed from the mounting hole 13.

[0050] A pushing slider 14 is provided at one end of the chute 7, and a pushing cylinder 15 is installed on the first side plate 3. The telescopic end of the pushing cylinder 15 is connected to the pushing slider 14. A drop opening 16 is opened on the working platform outside the other end of the chute 7. A receiving box can be placed under the drop opening 16 or a conveyor belt can be set to connect to the next workstation.

[0051] A material pressing mechanism is installed on the first cross beam 4 corresponding to the slide groove 7, and a pressing cap assembly is installed on the third cross beam 6 correspondingly.

[0052] The pressing mechanism includes a three-axis guide cylinder A17 and a pressing positioning block 18. The three-axis guide cylinder A17 is horizontally fixed on the first crossbeam 4, and the pressing positioning block 18 is installed at the telescopic end of the three-axis guide cylinder A17. The functions of the pressing positioning block 18 are: first, to press the side plate so that the side plate does not move during the cap pressing process; second, to correct the deformation of the side plate itself; third, to correct the inaccuracy of the positioning mechanism.

[0053] The pressing cap assembly includes a three-axis guide cylinder B19, a first finger cylinder 20, a second finger cylinder 21, a horizontal fixing plate 22 and a vertical fixing plate 23. The three-axis guide cylinder B19 is vertically fixed on the third crossbeam 6, the horizontal fixing plate 22 is fixed to the telescopic end of the three-axis guide cylinder B19, and the vertical fixing plate 23 is installed on the bottom surface of the horizontal fixing plate 22. The first finger cylinder 20 is installed on one side of the vertical fixing plate 23 corresponding to the pressing mechanism, and the second finger cylinder 21 is fixed on the other opposite side. A plastic cap hook piece 24 is installed at the output end of the first finger cylinder 20, and a supporting portion for supporting the plastic cap is provided on the plastic cap hook piece 24. Specifically, the plastic cap hook piece 24 includes a hook piece A24-1 and a hook piece B24-2. One end of the hook piece A24-1 and the hook piece B24-2 is fixedly connected to the output end of the first finger cylinder 20, and the other end is a free end and correspondingly provided with a notch 24-3. When working, the edge of the notch 24-3 of the hook piece A24-1 and the hook piece B24-2 becomes a supporting portion for supporting the plastic cap. A plastic cap clamp 25 is installed at the output end of the second finger cylinder 21. The plastic cap clamp 25 is provided with a clamping portion for clamping the plastic cap. Specifically, the plastic cap clamp 25 includes a clamp A25-1 and a clamp B25-2. One end of the clamp A25-1 and the clamp B25-2 are fixedly connected to the output end of the second finger cylinder 21, and the other end is a free end, and a semicircular notch is correspondingly provided, thereby forming a cylindrical clamping portion. The supporting portion of the plastic cap hook 24 is located above the clamping portion of the plastic cap clamp 25. A sensing probe A (not shown in the figure) is provided in the slide 7, and a sensing probe B26 is provided above the plastic cap hook 24. A probe fixing plate 27 is installed on the side of the first finger cylinder 20, and the sensing probe B26 is installed on the probe fixing plate 27. The vertical fixing plate 23 is provided with a knocking block 43 corresponding to the plastic cap fixture 25. When working, the knocking block 43 presses the plastic cap to fit onto the side plate. In this embodiment, the knocking block 43 is made of nylon to avoid crushing the plastic cap. The output ends of the first finger cylinder 20 and the second finger cylinder 21 are both two clamping claws. The cylinder controls the clamping claws to move parallel on the linear track, thereby realizing the closing and opening actions.

[0054] A material receiving track 28 is installed on the second crossbeam 5 corresponding to the plastic cap hook 24, and the feeding mechanism includes a bracket 29, a vibration motor 30 is installed on the bracket 29, and a hopper 31 is installed on the vibration motor 30. The hopper 31 includes an inner cylinder 30-1 and an outer cylinder 30-2. The bottom of the inner cylinder 30-1 is an inverted cone, and the bottom of the outer cylinder 30-2 is connected to the inner cylinder through a bottom surface inclined toward the inner cylinder. An opening communicating with the bottom of the outer cylinder 30-2 is provided on the side wall at the bottom of the inner cylinder 30-1. When the feeding is blocked, some of the plastic caps that fall into the bottom of the outer cylinder can enter the inner cylinder 30-1 from the opening to re-feed. The inner wall of the inner cylinder 30-1 is provided with a spiral track 30-3 from the bottom to the top, and a dividing strip 30-4 is provided on the top surface of the spiral track 30-3, so as to divide the spiral track 30-3 into two parts, which are respectively connected to the conveying track 30-5. The tail end of the conveying track 30-5 is a discharge port, which is connected to the receiving track 28 through the feeding track 38, and the receiving track 28 is connected to the supporting part of the plastic cap hook 24. An inclined plate 32 is provided at the connection between the discharge port and the feeding track 38, and the inclined plate 32 is inclined to one side of the feeding track 38. This structural design allows the plastic cap to smoothly enter the feeding track 38.

[0055] A feeding mechanism 33 is installed at the position near the plastic cap fixture 25 on the outside of the material receiving track 28. The feeding mechanism can be a feeding cylinder or a nozzle. In this embodiment, a nozzle is preferred, and the nozzle is connected to a high-pressure air source. When the sensing probe B does not detect that there is a plastic cap in the plastic cap fixture, the nozzle blows out compressed air to blow the plastic cap into the plastic cap fixture, and the plastic cap hook supports the plastic cap so that the plastic cap does not fall out of the plastic cap fixture. When the sensing probe B detects that there is a plastic cap in the plastic cap fixture, the nozzle stops blowing air, the second finger cylinder is actuated, and the plastic cap fixture clamps the plastic cap.

[0056] A limit bar 34 is provided just above the material receiving track 28, and the limit bar 34 is arranged along the material receiving track 28. A plurality of limit fixing blocks 40 are installed on the material receiving track 28, and screws 41 are installed on the top of the limit fixing blocks 40. The bottom end of the screw 41 is connected to the limit bar 34 through a spring 42. This structural design can limit the plastic cap on the material receiving track to prevent it from falling off the track.

[0057] A limiting rod 35 is provided just above the feeding track 38, and the limiting rod 35 is arranged along the feeding track 38. The feeding track 38 and the limiting rod 35 are both fixed to the hopper through a track connecting block 36. This structural design can limit the plastic cap on the feeding track 38 to prevent it from falling off the track.

[0058] A control box 37 is provided on the base frame 1, and a controller is installed in the control box 37. The pushing cylinder 15, the feeding mechanism 33, the three-axis guide cylinders A, B17, 19, the sensing probes A, B26, the first finger cylinder 20, the second finger cylinder 21 and the vibration motor 30 are all connected to the controller and controlled by the controller.

[0059] Working process:

[0060] See also Figures 1 to 24 , manually put the side plate 50 into the chute 7, after the induction probe A senses the side plate 50, the controller controls the push cylinder 15 to work, the telescopic end of the push cylinder 15 extends, and the push slider 14 pushes the side plate 50 to slide in the chute 7. After the side plate 50 contacts the bearing 12, the bearing 12 is forced to move down. When the groove 52 on the bottom surface of the side plate corresponds to the bearing 12, under the action of the spring sheet 10, the bearing 12 moves up and fits into the groove 52, thereby limiting the side plate 50 and resetting the push cylinder 15. The controller controls the three-axis guide cylinder A17 to work, and the three-axis guide cylinder A17 pushes the pressure positioning block 18, and the pressure positioning block 18 presses and fixes the side plate 50 in the chute 7.

[0061] On the other hand, the controller controls the vibration motor 30 to work, and the plastic cap 51 in the inner tube 30-1 of the hopper continuously moves upward along the spiral track 30-3. When it contacts the dividing strip 30-4, the plastic cap 51 is separated into two paths, entering the conveying track 30-5 respectively, and then entering the feeding track 38 after passing through the inclined plate 32, and entering the receiving track 28 along the feeding track 38. When the plastic cap 51 moves to the tail end of the receiving track 28, the induction probe B26 does not sense the plastic cap 51, and the controller controls the blowing nozzle to work, and the plastic cap 51 is pushed into the gap 24-3 between the hook piece A24-1 and the hook piece B24-2, and is supported by the supporting part. At this time, the induction probe B detects that there is a plastic cap in the plastic cap clamp, and the blowing nozzle stops blowing. At the same time, the second finger cylinder 21 works, the clamp A25-1 and the clamp B25-2 are closed, and the clamping part clamps the plastic cap 51. The three-axis guide cylinder B19 works, driving the first finger cylinder 20 and the second finger cylinder 21 to move downward rapidly, and the knocking block 43 knocks the plastic cap 51, pressing the plastic cap 51 downward to fit on the side plate 50, and then the first finger cylinder 20 drives the hook piece A24-1 and the hook piece B24-2 to open, and at the same time the second finger cylinder 21 drives the clamp A25-1 and the clamp B25-2 to open, and the three-axis guide cylinder B19 resets, driving the first finger cylinder 20 and the second finger cylinder 21 to move upward rapidly to the original position, and at the same time the first finger cylinder 20 drives the hook piece A24-1 and the hook piece B24-2 to close and reset, waiting to support the next plastic cap 51. At the same time, the mouthpiece blows air to blow the plastic cap into the plastic cap clamp, preparing for the next cap pressing action.

[0062] The next side plate 50 is placed in the chute 7. After the induction probe A senses the side plate 50, the controller controls the push cylinder 15 to work, the telescopic end of the push cylinder 15 extends, and the push slider 14 pushes the side plate 50 to slide in the chute 7, thereby pushing the side plate with the plastic cap installed to slide toward the side of the drop opening 16, and finally falls from the drop opening 16 to the receiving box or the conveyor belt. The next side plate 50 continues to move in the chute 7 until it is limited by the positioning mechanism, and then the above steps are repeated.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A packaging box side plate cap pressing device, characterized in that: It includes a cap pressing mechanism and a feeding mechanism; The cap pressing mechanism includes a base frame, a working platform is arranged on the top surface of the base frame, first side plates are symmetrically installed on the left and right sides of the working platform, a first beam, a second beam and a third beam are installed between the two first side plates, the first beam is arranged in parallel with the second beam, the third beam is located directly above the second beam, a slide groove is arranged between the first beam and the second beam, a pushing slider is arranged at one end of the slide groove, a pushing cylinder is installed on the first side plate, the telescopic end of the pushing cylinder is connected to the pushing slider, a blanking port is opened on the working platform outside the other end of the slide groove, a pressing mechanism is installed on the first beam corresponding to the slide groove, and a cap pressing assembly is installed on the third beam correspondingly; The material pressing mechanism comprises a three-axis guide cylinder A and a material pressing positioning block, wherein the three-axis guide cylinder A is fixed on the first crossbeam, and the material pressing positioning block is installed at the telescopic end of the three-axis guide cylinder A; The cap pressing assembly includes a three-axis guide cylinder B, a first finger cylinder, a second finger cylinder, a horizontal fixing plate and a vertical fixing plate. The three-axis guide cylinder B is vertically fixed on the third crossbeam, the horizontal fixing plate is fixed on the telescopic end of the three-axis guide cylinder B, the vertical fixing plate is installed on the bottom surface of the horizontal fixing plate, the first finger cylinder and the second finger cylinder are correspondingly fixed on the front and back of the vertical fixing plate, a plastic cap hook is installed on the output end of the first finger cylinder, and a supporting part for supporting the plastic cap is provided on the plastic cap hook, a plastic cap clamp is installed on the output end of the second finger cylinder, and a clamping part for clamping the plastic cap is provided on the plastic cap clamp, and the supporting part of the plastic cap hook is located above the clamping part of the plastic cap clamp; a sensing probe A is provided in the slide groove, and a sensing probe B is provided above the plastic cap hook; A material receiving track is installed on the second crossbeam corresponding to the plastic cap hook piece, and the feeding mechanism includes a bracket, a vibration motor is installed on the bracket, and a hopper is installed on the vibration motor. The discharge port of the hopper is connected to the material receiving track through the feeding track, and the material receiving track is connected to the supporting part of the plastic cap hook piece; A control box is provided on the base frame, and a controller is installed in the control box. The pushing cylinder, three-axis guide cylinders A, B, induction probes A, B, the first finger cylinder, the second finger cylinder and the vibration motor are all connected to the controller. Baffles are provided under the first beam and the second beam, and the bottoms of the two baffles are connected by a bottom plate to form a slide groove. A feeding mechanism is installed on the outer side of the material receiving track near the plastic cap clamp, and an inclined plate is provided at the connection between the discharge port and the feeding track, and the inclined plate is inclined toward one side of the feeding track.

2. The packaging box side plate cap pressing device according to claim 1, characterized in that: An aluminum profile is fixed on the working platform below the base plate, and a positioning mechanism is fixed on the aluminum profile. The positioning mechanism includes a spring sheet, a bearing seat and a bearing. One end of the spring sheet is fixed on the aluminum profile, and the other end is a free end, and a bearing seat is installed on it. The bearing is installed on the bearing seat. A mounting hole is opened on the base plate, and the upper part of the bearing is exposed from the mounting hole.

3. The packaging box side plate cap pressing device according to claim 2, characterized in that: A limit bar is provided just above the material connection track and arranged along the material connection track. A plurality of limit fixing blocks are installed on the material connection track. Screws are installed on the tops of the limit fixing blocks, and the bottom ends of the screws are connected to the limit bar through springs.

4. The packaging box side plate cap pressing device according to claim 2, characterized in that: A knocking block is installed on the vertical fixing plate corresponding to the plastic cap clamp.

5. The packaging box side plate cap pressing device according to claim 2, characterized in that: A limit rod is provided just above the feeding track and is arranged along the feeding track. The feeding track and the limit rod are both fixed on the hopper through a track connecting block.

6. The side plate cap pressing device of the packaging box according to claim 2, characterized in that: The hopper comprises an inner cylinder and an outer cylinder. The bottom of the inner cylinder is in an inverted cone shape. The bottom of the outer cylinder is connected to the inner cylinder through a bottom surface inclined toward the inner cylinder. An opening communicating with the bottom of the outer cylinder is provided at the bottom of the inner cylinder.

7. The packaging box side plate cap pressing device according to claim 6, characterized in that: A spiral track is arranged on the inner wall of the inner cylinder from the bottom to the top, and a dividing strip is arranged on the top surface of the spiral track, so as to divide the spiral track into two parts, and the two parts are respectively connected to the conveying track.

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