Melon seed assembly line stone removing device

Abstract

The utility model relates to the technical field of melon seed stone removing, and discloses a melon seed assembly line stone removing device which comprises a working table, a first filtering assembly is arranged at the top of the working table, and a second filtering assembly is arranged at the top of the working table; the first filtering assembly comprises a supporting frame, the outer surface of the supporting frame is slidably sleeved with a sliding block, a threaded rod is embedded in the sliding block in a threaded mode, the outer surface of the threaded rod is sleeved with a threaded block in a threaded mode, the threaded block is slidably embedded in the sliding block, and one side of the outer surface of the sliding block is fixedly connected with a primary filtering box. The second filtering assembly comprises a fixing frame, a sliding groove is formed in the fixing frame, a plurality of rolling wheels are slidably embedded in the sliding groove, one side of the outer surface of each rolling wheel is rotationally sleeved with a connecting rod, and the sides, away from the rolling wheels, of the connecting rods are fixedly connected with a re-filtering box. The problems that only single-layer filtering is used in the using process, and adaptability and flexibility are poor are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to melon seed stone removing technical field, concretely is a melon seed assembly line stone removing device. BACKGROUND

[0002] Melon seed is an important crop widely used for food. From a botanical perspective, melon seed is actually a type of achene, which means that its fruit coat is dry and hard, and contains seeds inside. What people commonly refer to as "melon seed" is the whole achene, including the outer shell and the edible part inside.

[0003] Chinese public patent number: CN219965556U discloses a "pumpkin seed assembly line stone removing device", which comprises a support frame, a treatment box is arranged on the top of the support frame, a feed box is arranged on the left side of the top of the treatment box, a feed conveying belt is arranged in the feed box, a support plate is arranged on the inner bottom wall of the treatment box, a through hole is arranged on the inner wall of the treatment box, a discharge guide box is arranged on the right side of the support plate and extends through the through hole to the right side, a discharge conveying belt is arranged in the discharge guide box, a guide inclined plate is arranged on the left side of the support plate, and a collection box is arranged on the inner bottom wall of the treatment box and extends to the left side below the guide inclined plate. The pumpkin seed assembly line stone removing device effectively helps users to remove stones from pumpkin seeds, is convenient for assembly line use and does not need manual carrying, improves the working efficiency of stone removal and filtration, and is convenient for users to use.

[0004] The prior art uses single-layer filtration during use, but the single screening method cannot effectively handle materials of different particle sizes, shapes and densities, resulting in a slow screening process and difficulty in effectively separating fine impurities such as sand particles and soil from melon seeds, which leads to a decrease in product quality. In addition, the device has poor adaptability and flexibility during use, making it difficult to handle different materials and unable to adapt to melon seeds of different particle sizes. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a melon seed assembly line stone removing device to solve the problem of slow screening process and difficulty in effectively separating fine impurities such as sand particles and soil from melon seeds, which leads to a decrease in product quality, and poor adaptability and flexibility of the device during use, making it difficult to handle different materials and unable to adapt to melon seeds of different particle sizes.

[0006] To solve the above technical problems, the utility model provides the following technical scheme: a melon seed assembly line stone removing device, comprising a workbench, a first filtering assembly is arranged on the top of the workbench, and a second filtering assembly is arranged on the top of the workbench.

[0007] The first filter assembly comprises a support frame, and the outer surface of the support frame is sleeved with a sliding block, the inside of the sliding block is threaded with a threaded rod, and the outer surface of the threaded rod is threaded with a threaded block, the threaded block is slidingly embedded in the inside of the sliding block, and one side of the outer surface of the sliding block is fixedly connected with a primary filter box.

[0008] The second filter assembly comprises a fixed frame, and the inside of the fixed frame is provided with a sliding groove, the inside of the sliding groove is slidingly embedded with a plurality of rollers, and one side of the outer surface of the plurality of rollers is rotatably sleeved with a connecting rod, and one side of the plurality of connecting rods away from the rollers is fixedly connected with a secondary filter box.

[0009] Preferably, the inside of the support frame is rotatably embedded with a rotating column, and the outer surface of the rotating column is fixedly connected with a rotating disc, and one side of the outer surface of the rotating disc is fixedly connected with an upper fixed cylinder.

[0010] Preferably, the inside of the upper fixed cylinder is rotatably embedded with an upper connecting ball, the outer surface of the top of the threaded block is fixedly connected with a lower fixed cylinder, and the inside of the lower fixed cylinder is rotatably embedded with a lower connecting ball, the outer surface of the lower connecting ball is fixedly connected with a transmission rod, and one side of the transmission rod away from the lower connecting ball is fixedly connected to the outer surface of the upper connecting ball.

[0011] Preferably, the inside of the workbench is rotatably embedded with a first belt disc, the inside of the workbench is rotatably embedded with a second belt disc, and the outer surface of the second belt disc is wrapped with a belt, and one side of the belt away from the second belt disc is wrapped on the outer surface of the first belt disc.

[0012] Preferably, one side of the outer surface of the second belt disc is fixedly connected with a power column, and the outer surface of the power column is rotatably sleeved with a transmission plate, the top of the outer surface of the secondary filter box is fixedly connected with a transmission column, and the transmission column is slidingly embedded in the inside of the transmission plate.

[0013] Preferably, the top of the outer surface of the workbench is fixedly connected with a plurality of electric push rods, the top of the outer surface of the plurality of electric push rods is fixedly connected with a moving plate, one side of the outer surface of the moving plate is fixedly connected with a lower hopper, the inside of the lower hopper is provided with a lower discharge pipe, and the bottom of the outer surface of the workbench is provided with a collection box. Preferably, the bottom of the outer surface of the workbench is fixedly connected with a third motor plate, one side of the outer surface of the third motor plate is provided with a third motor, the output shaft of the third motor is fixedly connected with the first belt disc, one side of the outer surface of the sliding block is fixedly connected with a second motor plate, the top of the outer surface of the second motor plate is provided with a second motor, the output shaft of the second motor is fixedly connected with the threaded rod, the top of the outer surface of the support frame is fixedly connected with a first motor, the output shaft of the first motor is fixedly connected with the rotating column, and the support frame is fixedly connected to the top of the outer surface of the fixed frame.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] First, the utility model discloses a pipeline is arranged at the top of the hopper, and the melon seeds are conveyed to the hopper through the pipeline, and the melon seeds fall into the primary filter box through the discharge pipe in the hopper, the discharge pipe is internally provided with a valve, the first motor at the top of the support frame is opened, the output shaft of the first motor is fixedly connected with the rotating column, the rotating column is driven to rotate through the first motor, the rotating column rotates to drive the rotating disc to rotate, the rotating disc rotates to drive the upper fixed cylinder and the upper connecting ball to rotate, the upper fixed cylinder is arranged at the eccentric position of the rotating disc, the upper connecting ball is connected with the lower connecting ball through the transmission rod, the sliding block is driven to move up and down through the transmission rod, the melon seeds in the primary filter box are filtered through the up-and-down movement of the sliding block, the second motor at the top of the second motor plate is opened, the output shaft of the second motor is fixedly connected with the threaded rod, the threaded rod is driven to rotate through the second motor, the threaded rod rotates to drive the threaded block to move, when the lower connecting ball is closer to the rotating column, the movement amplitude of the sliding block is smaller, when the lower connecting ball is away from the rotating column and close to the two sides of the sliding block, the movement amplitude is larger, through the technical scheme, the primary filtering of the melon seeds is completed, different batches of melon seeds have different density, shape and size, the screening effect can be optimized through the adjustment of the vibration amplitude, various materials can be effectively separated, and the adjustable movement amplitude can be adjusted according to actual requirements, unnecessary wear and tear is reduced, and the service life of the equipment is prolonged.

[0016] Second, the melon seeds filtered for the first time fall into the secondary filter box, the third motor on one side of the third motor plate is opened, the output shaft of the third motor is fixedly connected with the first belt disc, the first belt disc is driven to rotate through the third motor, the first belt disc rotates to drive the second belt disc to rotate through the belt, the second belt disc drives the power column to rotate, the power column drives the transmission plate to rotate, the transmission plate rotates to drive the secondary filter box to move, the secondary filter box moves back and forth in the sliding groove through the connecting rod and the roller, the melon seeds are filtered for the second time through the back-and-forth movement of the secondary filter box, and the gap between the filter holes in the secondary filter box is smaller than that in the primary filter box, the melon seeds after the stones are removed fall into the collecting box, through the technical scheme, part of the fine impurities or the materials not completely separated after single filtering can still be mixed in the melon seeds, the impurities are further separated through the secondary filter box, the materials are constantly changed in position in the secondary filter box through the dynamic screening mode, the contact opportunity of the materials and the secondary filter box is increased, and the screening efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0018] Figure 2 It is the first filter assembly three-dimensional structure schematic view of the utility model;

[0019] Figure 3 It is the second filter assembly three-dimensional structure schematic view of the utility model;

[0020] Figure 4 It is the second filter assembly bottom three-dimensional structure schematic view of the utility model.

[0021] Wherein: 1, workbench;2, support frame;201, upper fixed cylinder;202, rotating column;203, rotating disc;3, transmission rod;301, upper connecting ball;302, lower connecting ball;4, sliding block;401, threaded rod;402, threaded block;403, lower fixed cylinder;404, primary filter box;5, first motor;501, second motor;502, second motor plate;6, fixed frame;601, sliding groove;7, secondary filter box;701, roller;702, connecting rod;703, transmission column;704, transmission plate;8, belt;801, first belt pulley;802, second belt pulley;803, power column;804, third motor;805, third motor plate;9, hopper;901, discharge pipe;902, moving plate;903, electric push rod;10, collection box. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] Please refer to Figures 1-4 A melon seed assembly line stone removing device, including workbench 1, the top of workbench 1 is provided with first filter assembly, the top of workbench 1 is provided with second filter assembly;

[0024] The first filter assembly includes support frame 2, and the outer surface of support frame 2 is slidably provided with sliding block 4, the inside of sliding block 4 is threadedly provided with threaded rod 401, and the outer surface of threaded rod 401 is threadedly provided with threaded block 402, threaded block 402 is slidably embedded in the inside of sliding block 4, and the one side of the outer surface of sliding block 4 is fixedly connected with primary filter box 404;

[0025] The second filter assembly includes fixed frame 6, and the inside of fixed frame 6 is provided with sliding groove 601, a plurality of rollers 701 are slidably embedded in the inside of sliding groove 601, and the one side of the outer surface of a plurality of rollers 701 is rotatably provided with connecting rod 702, and the side, away from roller 701, of a plurality of connecting rods 702 is fixedly connected with secondary filter box 7.

[0026] Through the technical scheme, the flow line is arranged at the top of the lower hopper 9, melon seeds are conveyed into the lower hopper 9 through the flow line, and fall into the primary filtering box 404 through the discharging pipe 901 in the lower hopper 9. The discharging pipe 901 is internally provided with a valve. The first motor 5 at the top of the support frame 2 is turned on, the output shaft of the first motor 5 is fixedly connected with the rotating column 202, the rotating column 202 is driven to rotate by the first motor 5, the rotating column 202 rotates to drive the rotating disc 203 to rotate, the rotating disc 203 rotates to drive the upper fixed cylinder 201 and the upper connecting ball 301 to rotate. The upper fixed cylinder 201 is arranged at an eccentric position of the rotating disc 203. The upper connecting ball 301 is connected with the lower connecting ball 302 through the transmission rod 3. The sliding block 4 is driven to move up and down through the transmission rod 3. The melon seeds in the primary filtering box 404 are filtered through the up-and-down movement of the sliding block 4. The second motor 501 at the top of the second motor plate 502 can be turned on. The output shaft of the second motor 501 is fixedly connected with the threaded rod 401. The threaded rod 401 is driven to rotate by the second motor 501. The threaded rod 401 rotates to drive the threaded block 402 to move. When the lower connecting ball 302 is closer to the rotating column 202, the movement amplitude of the sliding block 4 is smaller. When the lower connecting ball 302 is away from the rotating column 202 and close to the two sides of the sliding block 4, the movement amplitude is larger. Through the technical scheme, the primary filtering of melon seeds is completed. Different batches of melon seeds have different densities, shapes and sizes. The screening effect can be optimized by adjusting the vibration amplitude, so that various materials can be effectively separated. The adjustable movement amplitude can be adjusted according to actual needs, unnecessary wear is reduced, and the service life of the equipment is prolonged.

[0027] Through the technical scheme, the melon seeds after the primary filtration fall into the inside of the re-filtering box 7, the third motor 804 on the side of the third motor plate 805 is started, the output shaft of the third motor 804 is fixedly connected with the first belt disc 801, the first belt disc 801 is driven to rotate by the third motor 804, the second belt disc 802 is driven to rotate by the first belt disc 801 rotating through the belt 8, the power column 803 is driven to rotate by the second belt disc 802, the transmission plate 704 is driven to rotate by the power column 803, the re-filtering box 7 is driven to move by the transmission plate 704 rotating, the re-filtering box 7 moves back and forth in the sliding groove 601 through the connecting rod 702 connected with the roller 701, the melon seeds are filtered for the second time through the back-and-forth movement of the re-filtering box 7, the gap between the filter holes in the re-filtering box 7 is smaller than that in the primary filtering box 404, and the melon seeds after the stones are removed fall into the inside of the collecting box 10, through the technical scheme, some small impurities or materials not completely separated after single filtration may still be mixed in the melon seeds, the impurities are further separated by the re-filtering box 7, the materials change positions in the re-filtering box 7 through the dynamic screening mode, the contact opportunity of the materials and the re-filtering box 7 is increased, and the screening efficiency is improved.

[0028] Specifically, the inside of the support frame 2 is rotatably embedded with a rotating column 202, and the outer surface of the rotating column 202 is fixedly connected with a rotating disc 203.

[0029] Through the technical scheme, the rotating column 202 rotates to drive the rotating disc 203 to rotate, and the rotating disc 203 rotates to drive the upper fixed cylinder 201 to rotate.

[0030] Specifically, the inside of the upper fixed cylinder 201 is rotatably embedded with an upper connecting ball 301, the top of the outer surface of the threaded block 402 is fixedly connected with a lower fixed cylinder 403, the inside of the lower fixed cylinder 403 is rotatably embedded with a lower connecting ball 302, the outer surface of the lower connecting ball 302 is fixedly connected with a transmission rod 3, and the side, away from the lower connecting ball 302, of the transmission rod 3 is fixedly connected to the outer surface of the upper connecting ball 301.

[0031] Through the technical scheme, the upper connecting ball 301 is connected to the lower connecting ball 302 through the transmission rod 3.

[0032] Specifically, the inside of the workbench 1 is rotatably embedded with a first belt disc 801, the inside of the workbench 1 is rotatably embedded with a second belt disc 802, the outer surface of the second belt disc 802 is sleeved with a belt 8, and the side, away from the second belt disc 802, of the belt 8 is sleeved on the outer surface of the first belt disc 801.

[0033] Through the technical scheme, the first belt disc 801 rotates to drive the second belt disc 802 to rotate through the belt 8.

[0034] Specifically, one side of the outer surface of the second belt disc 802 is fixedly connected with a power column 803, and the outer surface of the power column 803 is rotatably sleeved with a transmission plate 704. The top of the outer surface of the complex filter box 7 is fixedly connected with a transmission column 703, and the transmission column 703 is slidably embedded in the inside of the transmission plate 704.

[0035] Through the above technical scheme, the second belt disc 802 drives the power column 803 to rotate, and the power column 803 drives the transmission plate 704 to rotate, and the transmission plate 704 rotates to drive the complex filter box 7 to move.

[0036] Specifically, the top of the outer surface of the workbench 1 is fixedly connected with a plurality of electric push rods 903, and the top of the outer surface of each of the plurality of electric push rods 903 is fixedly connected with a moving plate 902. One side of the outer surface of the moving plate 902 is fixedly connected with a lower hopper 9, and the inside of the lower hopper 9 is provided with a lower feeding pipe 901. The bottom of the outer surface of the workbench 1 is provided with a collection box 10.

[0037] Through the above technical scheme, the assembly line is arranged at the top of the lower hopper 9. The melon seeds are conveyed into the inside of the lower hopper 9 through the assembly line, and then fall into the primary filter box 404 through the lower feeding pipe 901 in the lower hopper 9. The inside of the lower feeding pipe 901 is provided with a valve. The melon seeds after removing stones fall into the inside of the collection box 10.

[0038] Specifically, the bottom of the outer surface of the workbench 1 is fixedly connected with a third motor plate 805, and one side of the outer surface of the third motor plate 805 is provided with a third motor 804. The output shaft of the third motor 804 is fixedly connected with the first belt disc 801. One side of the outer surface of the sliding block 4 is fixedly connected with a second motor plate 502, and the top of the outer surface of the second motor plate 502 is provided with a second motor 501. The output shaft of the second motor 501 is fixedly connected with the threaded rod 401. The top of the outer surface of the support frame 2 is fixedly connected with the first motor 5, and the output shaft of the first motor 5 is fixedly connected with the rotating column 202. The support frame 2 is fixedly connected to the top of the outer surface of the fixed frame 6.

[0039] Through the above technical scheme, the first belt disc 801 is driven to rotate by the third motor 804, the rotating column 202 is driven to rotate by the first motor 5, and the threaded rod 401 is driven to rotate by the second motor 501.

[0040] In use, the flow line is arranged at the top of the lower hopper 9, and the melon seeds are transported into the lower hopper 9 through the flow line, and then fall into the primary filtering box 404 through the discharging pipe 901 in the lower hopper 9. The discharging pipe 901 is provided with a valve. The first motor 5 at the top of the support frame 2 is turned on, the output shaft of the first motor 5 is fixedly connected with the rotating column 202, the rotating column 202 is driven to rotate by the first motor 5, the rotating column 202 rotates to drive the rotating disc 203 to rotate, the rotating disc 203 rotates to drive the upper fixed cylinder 201 and the upper connecting ball 301 to rotate. The upper fixed cylinder 201 is arranged at the eccentric position of the rotating disc 203, the upper connecting ball 301 is connected with the lower connecting ball 302 through the transmission rod 3, the sliding block 4 is driven to move up and down through the transmission rod 3, and the melon seeds in the primary filtering box 404 are filtered through the up-and-down movement of the sliding block 4. The second motor 501 at the top of the second motor plate 502 can be turned on, the output shaft of the second motor 501 is fixedly connected with the threaded rod 401, the threaded rod 401 is driven to rotate by the second motor 501, the threaded rod 401 rotates to drive the threaded block 402 to move. When the lower connecting ball 302 is closer to the rotating column 202, the movement amplitude of the sliding block 4 is smaller, and when the lower connecting ball 302 is away from the rotating column 202 and close to the two sides of the sliding block 4, the movement amplitude is larger. Through the above technical scheme, the primary filtering of the melon seeds is completed. Different batches of melon seeds have different densities, shapes and sizes. By adjusting the vibration amplitude, the screening effect can be optimized to ensure that various materials can be effectively separated. The adjustable movement amplitude can be adjusted according to actual needs to reduce unnecessary wear and tear and prolong the service life of the equipment. The melon seeds after primary filtering fall into the secondary filtering box 7, the third motor 804 on one side of the third motor plate 805 is turned on, the output shaft of the third motor 804 is fixedly connected with the first belt pulley 801, the first belt pulley 801 is driven to rotate by the third motor 804, the second belt pulley 802 is driven to rotate by the belt 8, the power column 803 is driven to rotate by the second belt pulley 802, the transmission plate 704 is driven to rotate by the power column 803, the transmission plate 704 rotates to drive the secondary filtering box 7 to move. The secondary filtering box 7 moves back and forth in the sliding groove 601 through the connecting rod 702 and the roller 701 connected with the secondary filtering box 7. The secondary filtering box 7 moves back and forth to filter the melon seeds twice. The gap between the filtering holes in the secondary filtering box 7 is smaller than that in the primary filtering box 404. The melon seeds after stone removal fall into the collecting box 10. Through the above technical scheme, some small impurities or materials that are not completely separated after single filtering may still be mixed in the melon seeds. The secondary filtering box 7 further separates these impurities through dynamic screening, so that the materials continuously change position in the secondary filtering box 7, increase the contact opportunity between the materials and the secondary filtering box 7, and improve the screening efficiency.

[0041] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stone removal device for a sunflower seed production line, comprising a workbench (1), characterized in that: The top of the workbench (1) is provided with a first filter assembly, and the top of the workbench (1) is provided with a second filter assembly. The first filter assembly includes a support frame (2), and a slider (4) is slidably sleeved on the outer surface of the support frame (2). A threaded rod (401) is threaded inside the slider (4), and a threaded block (402) is threaded on the outer surface of the threaded rod (401). The threaded block (402) is slidably sleeved inside the slider (4). A primary filter box (404) is fixedly connected to one side of the outer surface of the slider (4). The second filter assembly includes a fixing frame (6), and the fixing frame (6) is provided with a sliding groove (601). Multiple rollers (701) are slidably embedded in the sliding groove (601), and a connecting rod (702) is rotatably sleeved on one side of the outer surface of the multiple rollers (701). A secondary filter box (7) is fixedly connected to the side of the multiple connecting rods (702) away from the rollers (701).

2. The stone removal device for a sunflower seed production line according to claim 1, characterized in that: The support frame (2) has a rotating column (202) embedded inside, and a rotating disk (203) is fixedly connected to the outer surface of the rotating column (202). An upper fixed cylinder (201) is fixedly connected to one side of the outer surface of the rotating disk (203).

3. The stone removal device for a sunflower seed production line according to claim 2, characterized in that: The upper fixed cylinder (201) is rotatably embedded with an upper connecting ball (301), and the top of the outer surface of the threaded block (402) is fixedly connected with a lower fixed cylinder (403), and the lower fixed cylinder (403) is rotatably embedded with a lower connecting ball (302). The outer surface of the lower connecting ball (302) is fixedly connected with a transmission rod (3), and the side of the transmission rod (3) away from the lower connecting ball (302) is fixedly connected to the outer surface of the upper connecting ball (301).

4. The stone removal device for a sunflower seed production line according to claim 1, characterized in that: The workbench (1) is internally fitted with a first belt pulley (801) and a second belt pulley (802) is internally fitted with a second belt pulley (802). The outer surface of the second belt pulley (802) is wrapped with a belt (8). The side of the belt (8) away from the second belt pulley (802) is wrapped with the outer surface of the first belt pulley (801).

5. The stone removal device for a sunflower seed production line according to claim 4, characterized in that: A power column (803) is fixedly connected to one side of the outer surface of the second pulley (802), and a transmission plate (704) is rotatably sleeved on the outer surface of the power column (803). A transmission column (703) is fixedly connected to the top of the outer surface of the secondary filter box (7), and the transmission column (703) is slidably embedded in the inside of the transmission plate (704).

6. The stone removal device for a sunflower seed production line according to claim 1, characterized in that: Multiple electric actuators (903) are fixedly connected to the top of the outer surface of the workbench (1), and a movable plate (902) is fixedly connected to the top of the outer surface of each of the multiple electric actuators (903). A feeding hopper (9) is fixedly connected to one side of the outer surface of the movable plate (902), and a feeding pipe (901) is provided inside the feeding hopper (9). A collection box (10) is provided at the bottom of the outer surface of the workbench (1).

7. The stone removal device for a sunflower seed production line according to claim 1, characterized in that: The bottom of the outer surface of the workbench (1) is fixedly connected to a third motor plate (805), and a third motor (804) is provided on one side of the outer surface of the third motor plate (805). The output shaft of the third motor (804) is fixedly connected to the first pulley (801). A second motor plate (502) is fixedly connected to one side of the outer surface of the slider (4), and a second motor (501) is provided on the top of the outer surface of the second motor plate (502). The output shaft of the second motor (501) is fixedly connected to the threaded rod (401). A first motor (5) is fixedly connected to the top of the outer surface of the support frame (2), and the output shaft of the first motor (5) is fixedly connected to the rotating column (202). The support frame (2) is fixedly connected to the top of the outer surface of the fixed frame (6).

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