A health care product production, conveying and packaging machine

Abstract

The present invention discloses a health care product production, conveying and packaging machine, which relates to the technical field of health care product conveying and packaging equipment. The health care product production, conveying and packaging machine includes a workbench, a vertical plate symmetrically installed on the upper end surface of the workbench, and an electric slider slidably connected to the opposite sides of the vertical plate. The outside of the sliding rod is equidistantly slidably connected to a plurality of clamping and pressing mechanisms through a sliding block. The clamping and pressing mechanism includes: a pressure rod fixedly connected to the lower end surface of the sliding block, a rectangular block fixedly connected to the lower end of the pressure rod, and a distance adjustment unit for adjusting the distance between two adjacent clamping and pressing mechanisms is installed between the two vertical plates. The present invention uses an arc-shaped clamping plate to clamp the bottle body and place it in the placement groove. The pressure rod continues to descend and collides with the push rod, and then pushes the arc-shaped airbag to extend from the groove to further press the bottle body, thereby ensuring that the bottle body can fully enter the placement groove, avoiding the shaking of the bottle body during transportation, and ensuring the normal efficacy and quality of the health care products.

Description

Technical Field

[0001] The present invention relates to the technical field of health care product conveying and packaging equipment, in particular to a health care product production, conveying and packaging machine. Background Art

[0002] Health care products are a popular term for health foods, which are a type of food. For example, the health-care effects of health foods are gradually being accepted by the general public in today's society. Packaging is an integral part of health care products. During the circulation process from the factory to the hands of consumers, it avoids damage from biological, chemical, and physical external factors. It can also maintain the stable quality of the health care products themselves. Some can also facilitate the consumption of health care products and beautify their appearance. When packaging liquid health care products such as bird's nests and honey, they are usually injected into bottles and then placed in packaging boxes.

[0003] The traditional packaging process is to use a mechanical gripper to pick up the bottle from the conveyor line and place it in the packaging box. In order to improve the protection of the bottle containing health products, the placement groove on the lining cotton in the packaging box is usually slightly smaller than the size of the bottle, and the two are placed in an "interference fit" manner. Therefore, after the mechanical gripper places the bottle into the placement groove, it is necessary to press the bottle down to make it completely enter the placement groove. The traditional method of direct placement by the mechanical gripper sometimes results in the bottle not fully entering the placement groove. There is a gap between the bottle and the placement groove, causing the bottle to shake arbitrarily in the packaging box during transportation. The constant shaking can easily cause damage to the health products, thereby affecting the efficacy and quality of the health products. Summary of the Invention

[0004] The present invention provides a health care product production, conveying and packaging machine, which solves the technical problem that in the existing process of packaging bottles containing health care products, there is a large gap between the bottle body and the placement groove, which easily causes the bottle body to shake during transportation, thereby affecting the efficacy and quality of the health care products.

[0005] The present invention provides a health care product production, conveying and packaging machine, comprising a workbench, a vertical plate symmetrically installed on the upper end surface of the workbench, and an electric slider slidably connected to the opposite sides of the vertical plate, a sliding rod fixedly connected between the two electric sliders, and a plurality of clamping mechanisms equidistantly slidably connected to the outside of the sliding rod through a sliding block, the clamping mechanism comprising: a pressure rod fixedly connected to the lower end surface of the sliding block, a rectangular block fixedly connected to the lower end of the pressure rod, a slide cylinder slidably installed on the outside of the rectangular block, an arc plate seat fixedly connected to the lower part of the slide cylinder, an arc plate hinged to the end of the arc plate seat through a rotating column and a torsion spring. A curved splint, a pull rod hinged on the left and right sides of the pressure rod and corresponding to the curved splint, a pull rope fixedly connected to the end of the pull rod and the outer side of the curved splint, a stop assembly installed between the two vertical plates for limiting the slide, a slot opened on the upper part of the curved plate seat and connected to the slide, a top column slidably connected to the inside of the slide through a tension spring, and an arc-shaped air bag fixedly connected to the lower end of the top column and located inside the slot; an adjustment mechanism for cooperating with the clamping mechanism to align the ends of the packaging bottles is installed on the upper end surface of the workbench, and a distance adjustment unit for adjusting the distance between two adjacent clamping mechanisms is installed between the two vertical plates.

[0006] In one possible implementation, the alignment mechanism includes two alignment plates symmetrically fixedly connected to the end surface of the workbench through support rods, a guide plate fixedly connected to the upper part of the alignment plate, a plurality of rectangular grooves opened on opposite sides of the alignment plate in the transverse and longitudinal directions, a spring telescopic column fixedly connected to the vertical groove wall of the rectangular groove, and a roller rotatably connected to the end of the spring telescopic column, and the outer wall of the roller is fixedly connected to an elastic rubber layer.

[0007] In one possible implementation, the distance adjustment unit includes a transverse plate fixedly connected between the vertical plates, two extrusion plates symmetrically hinged on the rear end face of the transverse plate, a convex plate slidably connected to the rear part of the transverse plate through a vertical groove, a bidirectional screw rotatably connected to the inside of the convex plate, a threaded sleeve symmetrically threadedly connected to the outside of the bidirectional screw, the threaded sleeve and the lower part of the extrusion plate are hinged to each other, and a shift pin fixedly connected to the front end face of the sliding block for cooperating with the extrusion plate.

[0008] In one possible implementation, the stop assembly includes a horizontal column fixedly connected between the vertical plates, a plurality of sliding sleeves slidably connected to the outside of the horizontal column and corresponding to the slide cylinder, a U-shaped slide frame fixedly connected to the front of the slide sleeve with the opening facing upward, and a limit column fixedly connected to the rear end face of the slide cylinder and slidably arranged inside the U-shaped slide frame.

[0009] In a possible implementation, an elastic rope is fixedly connected between the two electric sliders and directly above the sliding block, and a Y-shaped damping clip sleeved on the outside of the elastic rope is fixedly connected to the upper end surface of the sliding block.

[0010] In one possible implementation, vertical grooves are provided on the left and right cavity walls of the slide cylinder, and vertical blocks slidingly arranged inside the vertical grooves are fixedly connected to the left and right sides of the rectangular block, and a limiting spring is fixedly connected between the vertical grooves and the vertical blocks.

[0011] In a possible implementation, a wheel groove is formed at the lower portion of the arc-shaped clamping plate, and a cylinder is rotatably connected to the inside of the wheel groove.

[0012] It can be seen from the above technical solutions that the present invention has the following advantages:

[0013] In the present invention, through the cooperation of the arc-shaped clamping plate, slide cylinder, pressure rod and stop assembly in the clamping mechanism, after the arc-shaped clamping plate clamps the bottle body and moves it to the placement groove, it hovers under the action of the stop assembly, and then the pressure rod slides downward in the slide cylinder to push the arc-shaped airbag downward and press the bottle body into the placement groove, thereby ensuring that the bottle body can completely enter the placement groove, avoiding shaking during transportation, and ensuring the normal efficacy and quality of the health care products.

[0014] In the present invention, by combining the extrusion plate, the bidirectional screw and the shifting post in the distance adjustment unit, the inclination angle of the extrusion plate is adjusted according to the distance between two adjacent placement slots, and then the extrusion movement distance of the shifting post by the extrusion plate can be adjusted, so that the distance between two adjacent clamping mechanisms is matched with the position of the placement slots, and then the alignment plate in the alignment mechanism is abutted against the end of the bottle body, so that the end of the bottle body can be placed on the same plane, thereby ensuring that the bottle body in the conveying package can be accurately placed in the placement slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the structure of a health care product production, conveying and packaging machine provided by the present invention.

[0017] Figure 2 This is a rear view diagram of the overall structure provided by the present invention (the alignment mechanism is hidden).

[0018] Figure 3 The present invention provides Figure 2 Schematic diagram of the enlarged structure of part A in .

[0019] Figure 4 This is a schematic diagram of the installation structure of the clamping mechanism provided by the present invention.

[0020] Figure 5 This is a schematic cross-sectional structural diagram of the connection between the slide cylinder and the arc-shaped plate seat provided by the present invention.

[0021] Figure 6 This is a schematic diagram of the rear-view viewing angle structure of the distance adjustment unit provided by the present invention.

[0022] Figure 7 The present invention provides Figure 6 Schematic diagram of the enlarged structure of part B.

[0023] The above drawings include the following reference numerals:

[0024] 1. Workbench; 2. Vertical plate; 3. Electric slider; 4. Sliding rod; 5. Sliding block; 6. Clamping mechanism; 61. Pressing rod; 62. Rectangular block; 63. Slide; 64. Arc plate seat; 65. Arc splint; 66. Pull rod; 67. Pull rope; 68. Stop assembly; 681. Horizontal column; 682. Sliding sleeve; 683. U-shaped sliding frame; 684. Limiting column; 69. Top column; 610. Arc airbag; 7. Alignment mechanism; 71. Alignment plate; 72. Guide plate; 73. Roller; 8. Distance adjustment unit; 81. Horizontal plate; 82. Extrusion plate; 83. Convex plate; 84. Bidirectional screw; 85. Threaded sleeve; 86. Shifting column; 9. Elastic rope; 10. Y-shaped damping clamp; 11. Limiting spring; 12. Cylinder. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] See also Figure 1 and Figure 3The present invention provides a technical solution: a health care product production, conveying and packaging machinery, comprising a workbench 1, a vertical plate 2 symmetrically installed on the upper end surface of the workbench 1, and an electric slider 3 slidably connected to the opposite sides of the vertical plate 2. A sliding rod 4 is fixedly connected between the two electric sliders 3, and a plurality of clamping mechanisms 6 are equidistantly slidably connected to the outside of the sliding rod 4 through a sliding block 5. An elastic rope 9 is fixedly connected between the two electric sliders 3 and directly above the sliding block 5. The upper end surface of the sliding block 5 is fixedly connected with a Y-shaped damping clamp 10 sleeved on the outside of the elastic rope 9. During the sliding process of the sliding block 5, the friction between the Y-shaped damping clamp 10 and the elastic rope 9 is used to increase the resistance encountered during the movement, thereby preventing the sliding block 5 from sliding randomly. An adjustment mechanism 7 for cooperating with the clamping mechanism 6 to align the ends of the packaging bottle is installed on the upper end surface of the workbench 1, and a distance adjustment unit 8 for adjusting the distance between the two adjacent clamping mechanisms 6 is installed between the two vertical plates 2.

[0027] See also Figure 1 、 Figure 6 and Figure 7 In this embodiment, the distance adjustment unit 8 includes a transverse plate 81 fixedly connected between the vertical plates 2, two extrusion plates 82 symmetrically hinged on the rear end surface of the transverse plate 81, a convex plate 83 slidably connected to the rear part of the transverse plate 81 through a vertical groove, a bidirectional screw 84 rotatably connected to the inside of the convex plate 83, a threaded sleeve 85 symmetrically threadedly connected to the outside of the bidirectional screw 84, the threaded sleeve 85 and the lower part of the extrusion plate 82 are hinged to each other, and a shifting post 86 fixedly connected to the front end surface of the sliding block 5 for cooperating with the extrusion plate 82.

[0028] Before the bottle is transported and packaged, the inclination angle of the squeezing plate 82 is adjusted according to the distance between the two adjacent placement grooves of the lining cotton of the packaging box: the bidirectional screw 84 is rotated to drive the threaded sleeve 85 to move, and the threaded sleeve 85 then drives the squeezing plate 82 to rotate around the hinge point on its upper part. While the squeezing plate 82 rotates, it also drives the bidirectional screw 84 to move along the path of the vertical groove. After the clamping mechanism 6 clamps the bottle from the conveyor line, it moves downward. During the downward movement, the shifting post 86 touches the squeezing plate 82 and moves toward the direction close to the electric slider 3 under the action of the inclined surface of the squeezing plate 82 until it is staggered with the squeezing plate 82, so that the clamping mechanism 6 moves to the top of the corresponding placement groove during the downward movement, which is convenient for accurate placement of the bottle.

[0029] See also Figure 1 In this embodiment, the alignment mechanism 7 includes two alignment plates 71 symmetrically fixedly connected to the upper end surface of the workbench 1 through support rods, a guide plate 72 fixedly connected to the upper part of the alignment plate 71, a plurality of rectangular grooves opened on opposite sides of the alignment plate 71 in the transverse and longitudinal directions, a spring telescopic column fixedly connected to the vertical groove wall of the rectangular groove, and a roller 73 rotatably connected to the end of the spring telescopic column, and the outer wall of the roller 73 is fixedly connected to an elastic rubber layer.

[0030] After the clamping mechanism 6 has clamped the bottle body, it is driven to descend by the electric slider 3. During the descending process of the bottle body, its end will first contact the inclined guide plate 72, and then, under the pressure of the guide plate 72, it will move toward the direction close to the alignment plate 71 until it slides between the two alignment plates 71. Then, it will slide under the push of the roller 73 on the alignment plate 71, so that the end of the bottle clamped by the clamping mechanism 6 is on the same plane, which is convenient for further accurate placement of the bottle body. The roller 73 rolls when the bottle body is placed between the alignment plates 71 and moves down, which can reduce the friction between the end of the bottle body and the alignment plate 71, and the elastic rubber layer provided on the outer wall of the roller 73 can further protect the end of the bottle body to prevent the end of the bottle body from being scratched.

[0031] See also Figure 2 、 Figure 4 and Figure 5 In this embodiment, the clamping mechanism 6 includes: a pressure rod 61 fixedly connected to the lower end surface of the sliding block 5, a rectangular block 62 fixedly connected to the lower end of the pressure rod 61, a slide 63 slidably installed on the outside of the rectangular block 62, and vertical grooves are provided on the left and right cavity walls of the slide 63. The left and right sides of the rectangular block 62 are fixedly connected to vertical blocks slidably set inside the vertical grooves. A limiting spring 11 is fixedly connected between the vertical grooves and the vertical blocks. An arc-shaped plate seat 64 is fixedly connected to the lower part of the slide 63, and an arc-shaped clamping plate 65 is hinged at the end of the arc-shaped plate seat 64 through a rotating column and a torsion spring. A wheel groove is provided at the lower part of the arc-shaped clamping plate 65, and the wheel groove rotates inside the wheel groove. It is connected to a cylinder 12, and when the arc-shaped splint 65 clamps the bottle body, the cylinder 12 is rolled outside the bottle body to facilitate the clamping of the arc-shaped splint 65. A pull rod 66 is hinged on the left and right sides of the pressure rod 61 and corresponds to the arc-shaped splint 65. The end of the pull rod 66 and the outer side of the arc-shaped splint 65 are fixedly connected with a pull rope 67, a stop assembly 68 installed between the two vertical plates 2 for limiting the slide 63, a slot opened on the upper part of the arc-shaped plate seat 64 and connected to the slide 63, a top column 69 slidably connected to the inside of the slide 63 through a tension spring, and an arc-shaped air bag 610 fixedly connected to the lower end of the top column 69 and located inside the slot.

[0032] See also Figure 4 The stop assembly 68 includes a horizontal column 681 fixedly connected between the vertical plates 2, a plurality of sliding sleeves 682 slidably connected to the outside of the horizontal column 681 and corresponding to the slide 63, a U-shaped sliding frame 683 with an upward opening fixedly connected to the front of the sliding sleeve 682, the vertical section of the U-shaped sliding frame 683 is a spring expansion section, and a limit column 684 fixedly connected to the rear end face of the slide 63 and slidingly set inside the U-shaped sliding frame 683.

[0033] After that, the bottle is put into the bottle container 6, and the bottle container 6 is put into the bottle container 6. The bottle container 6 is put into the bottle container 6, and the bottle container 6 is put into the bottle container 6. The bottle container 6 is put into the bottle container 6, and the bottle container 6 is put into the bottle container 6.

[0034] When the slide 63 moves downward, the limiting post 684 is driven to slide in the U-shaped slide frame 683. After the limiting post 684 slides to the horizontal section of the U-shaped slide frame 683, since the vertical section of the U-shaped slide frame 683 is a spring expansion section, the limiting post 684 will press the U-shaped slide frame 683 downward to be stretched. When the bottle body moves downward with the arc plate seat 64 and enters the placement groove, the expansion section of the U-shaped slide frame 683 is stretched to the limit length, causing the limiting post 684 to stop moving downward, and the slide 63 is also limited by the limiting post 684 to stop moving downward, thereby causing the arc plate seat 64 to hover at this time, and then the pressure rod 61 continues to move downward. At this time, the pull rod 66 and the pressure rod 61 are hinged. As the pressure rod 61 descends, it gradually enters the slide 63. When the pull rod 66 contacts the slide 63, it will be hit by the upper edge of the slide 63 and then rotate around its hinge point. During the rotation, the pull rod 66 will pull the arc splint 65 upward through the pull rope 67, so that the arc splint 65 is separated from the bottle body, and then the bottle body loses the clamping of the arc splint 65. At this time, as the pressure rod 61 moves downward, the rectangular block 62 hits the push rod, and then the push rod is pushed and starts to move downward and drives the arc airbag 610 to move downward. The arc airbag 610 gradually extends from the slot and hits the upper part of the bottle body, thereby pressing the bottle body to continue to descend, so that the bottle body completely enters the placement slot.

[0035] After the packaging is completed, the electric slider 3 is controlled to drive the clamping mechanism 6 to rise. During the rising process of the clamping mechanism 6, the arc-shaped clamping plate 65 rotates and returns to the clamping state under the action of the torsion spring. During the reset rotation process, the arc-shaped clamping plate 65 will also drive the pull rod 66 to move out of the slide 63 through the pull rope 67 and rotate to the initial state before clamping. The top rod also moves upward under the action of the tension spring to drive the arc-shaped airbag 610 to rise and retract into the slot. Finally, the electric slider 3 drives the arc-shaped plate seat 64 to move to the initial position, and repeats the steps before clamping to package the next group of health care product bottles.

[0036] During operation, first adjust the inclination angle of the extrusion plate 82 in the distance adjusting unit 8 according to the distance between the two adjacent placement slots in the packaging box, then place the packaging box directly under the clamping mechanism 6, and adjust the position of the equipment for externally conveying the bottle body so that the bottle body is directly under the clamping mechanism 6, then the electric slider 3 drives the clamping mechanism 6 to descend, and during the descent of the clamping mechanism 6, it will clamp the bottle body on the external conveying equipment, and then descend through the distance adjusting unit 8 and cooperate with it, so as to adjust the distance between the two adjacent clamping mechanisms 6, and then the clamping mechanism 6 passes through the alignment mechanism 7, and the alignment mechanism 7 aligns the ends of the bottle body, and finally, the clamping mechanism 6 moves downward to place the bottle body into the placement slot, and the push rod pushes the arc-shaped airbag 610 downward to push the bottle body into the placement slot, thereby ensuring that the bottle body can be completely placed in the packaging box, avoiding damage to the health care products caused by improper packaging.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature designated as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A health product production, conveying and packaging machine, comprising a workbench, vertical plates symmetrically mounted on the end surfaces of the workbench, and electric sliders slidably connected to opposite sides of the vertical plates, characterized in that: A sliding rod is fixedly connected between the two electric sliders, and a plurality of clamping mechanisms are equidistantly slidably connected to the outside of the sliding rod through sliding blocks; The clamping mechanism comprises: A pressure rod fixedly connected to the lower end surface of the sliding block, a rectangular block fixedly connected to the lower end of the pressure rod, a sliding cylinder slidably installed on the outside of the rectangular block, a curved plate seat fixedly connected to the lower part of the sliding cylinder, a curved splint hinged to the end of the curved plate seat through a rotating column and a torsion spring, a pull rod hinged on the left and right side surfaces of the pressure rod and corresponding to the curved splint, a pull rope fixedly connected to the end of the pull rod and the outer side surface of the curved splint, and a stop assembly installed between the two vertical plates for limiting the sliding cylinder; A slot is provided on the upper portion of the arc-shaped plate seat and communicates with the slide, a top post is slidably connected to the inside of the slide via a tension spring, and an arc-shaped air bag is fixedly connected to the lower end of the top post and located inside the slot; An alignment mechanism is installed on the upper end surface of the workbench for cooperating with the clamping mechanism to align the ends of the packaging bottles, and a distance adjustment unit is installed between the two vertical plates for adjusting the distance between two adjacent clamping mechanisms; The alignment mechanism includes two alignment plates symmetrically fixedly connected to the end surface of the workbench through support rods, a guide plate fixedly connected to the upper part of the alignment plates, a plurality of rectangular slots opened on opposite sides of the alignment plates in the transverse and longitudinal directions, a spring telescopic column fixedly connected to the vertical slot walls of the rectangular slots, and a roller rotatably connected to the end of the spring telescopic column, and the outer wall of the roller is fixedly connected to an elastic rubber layer. The distance adjustment unit includes a transverse plate fixedly connected between the vertical plates, two extrusion plates symmetrically hinged on the rear end surface of the transverse plate, a convex plate slidably connected to the rear end of the transverse plate through a vertical groove, a bidirectional screw rotatably connected to the inside of the convex plate, a threaded sleeve symmetrically threadedly connected to the outside of the bidirectional screw, the threaded sleeve and the lower part of the extrusion plate are hinged to each other, and a shifting pin fixedly connected to the front end surface of the sliding block for cooperating with the extrusion plate.

2. The health care product production, conveying and packaging machine according to claim 1, characterized in that: The stop assembly includes a horizontal column fixedly connected between the vertical plates, a plurality of sliding sleeves slidably connected to the outside of the horizontal column and corresponding to the slide cylinder, a U-shaped slide frame fixedly connected to the front of the slide sleeve with the opening facing upward, and a limit column fixedly connected to the rear end surface of the slide cylinder and slidably arranged inside the U-shaped slide frame.

3. The health care product production, conveying and packaging machine according to claim 1, characterized in that: An elastic rope is fixedly connected between the two electric sliders and directly above the sliding block, and a Y-shaped damping clip sleeved on the outside of the elastic rope is fixedly connected to the upper end surface of the sliding block.

4. The health care product production, conveying and packaging machine according to claim 1, characterized in that: The left and right walls of the slide are both provided with vertical grooves, and the left and right sides of the rectangular block are both fixedly connected with vertical blocks slidably arranged inside the vertical grooves, and a limiting spring is fixedly connected between the vertical grooves and the vertical blocks.

5. The health care product production, conveying and packaging machine according to claim 1, characterized in that: A wheel groove is provided at the lower part of the arc-shaped clamping plate, and a cylinder is rotatably connected inside the wheel groove.

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