CN111824628B - Tourist attraction waste classification device - Google Patents

Abstract

The invention discloses a garbage classification device in tourist attractions. When the garbage is thrown in, the garbage is thrown into the third garbage feeding port through a flip cover and falls onto the control valve plate, and the visual detection and analysis component can Identify the garbage and analyze its classification. If the garbage is the third garbage, the control valve plate will fall into the garbage bucket in the middle when the control valve plate is opened. If the garbage is the first garbage or the second garbage, then The swing driving mechanism drives the sorting material plate to incline in the corresponding direction, and the auxiliary feeding mechanism can be used to unload the material, and the garbage can be sorted automatically; The method can automatically classify the garbage, which is convenient for the garbage to be discharged into the corresponding garbage hopper, and effectively improves the efficiency and reliability of garbage classification.

Description

A device for sorting garbage in tourist attractions

technical field

The invention relates to the technical field of garbage sorting devices, in particular to a garbage sorting device for tourist attractions.

Background technique

For tourist attractions, because the garbage in tourist attractions mainly includes beverage bottles, packaging bags, waste paper and food residues, etc., the garbage classification generally only needs to be divided into three types. Therefore, the classification of garbage in the scenic area is relatively simple. However, due to the large flow of people in the scenic area, the amount of garbage is generally large. Tourists generally come from all over the world. Therefore, tourists in scenic spots often do not know much about garbage classification in scenic spots, and different groups of tourists have different levels of understanding of garbage classification, which makes it difficult to rely on tourists' consciousness to classify garbage. Moreover, when the garbage hopper is full, the garbage hopper is relatively heavy, and it is time-consuming and laborious for the user to replace the garbage hopper, and the garbage hopper is easily dumped on the ground, which reduces the work efficiency.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

In order to overcome the deficiencies of the prior art, a garbage classification device in tourist attractions is proposed, which solves the problem of automatically classifying garbage and the fact that the garbage hopper is relatively heavy. When users replace the garbage hopper, it is time-consuming and laborious, and it is easy to dump the garbage hopper on the ground. the issue of work efficiency.

(2) Technical solutions

The present invention is achieved through the following technical solutions: the present invention proposes a garbage sorting device in tourist attractions, including an inner box, an outer body, a flip, a garbage hopper and a sorting mechanism, wherein the inner box is arranged on the outer side of the outer body. Inside, the bottom side and front side of the inner box are provided with three opening grooves, each of the opening grooves is respectively provided with a garbage hopper, the top of the inner box is open, and the top of the inner box is open. The sorting mechanism fixed on the outer main body is arranged above, and the middle position of the top of the outer main body is provided with a flip cover that is convenient for throwing garbage. The sorting mechanism includes a visual inspection and analysis assembly, a swing drive mechanism, a support mounting frame, a sorting material plate and an auxiliary blanking mechanism, wherein the visual inspection and analysis assembly is fixed on the top of the support installation frame, and the swing drive The mechanism is fixed at the middle position of the support and installation frame, the output end of the swing drive mechanism is connected with the classification material plate, the swing drive mechanism can drive the classification material plate to swing and tilt, and the two sides of the classification material plate are connected. The ends respectively extend to the top of the garbage hoppers on both sides. One side of the sorting material plate is provided with a first garbage feeding port, and the other side of the sorting material plate is provided with a second garbage feeding port. The middle position of the feeding plate is provided with a third garbage feeding port, a control valve plate is provided on the third garbage feeding port, and the auxiliary blanking materials facing oppositely are respectively provided on both sides of the third garbage feeding port. a mechanism, the upper part of the third garbage feeding port is located just opposite to the flip cover, and the control valve plate is in a normally closed state;

When throwing garbage, the garbage is thrown into the third garbage feeding port through the flip cover and falls onto the control valve plate, and the visual detection and analysis component can identify the garbage and analyze its classification. If the garbage is the third garbage, the control valve plate will fall into the middle garbage hopper when the control valve plate is opened. If the garbage is the first garbage or the second garbage, the swing driving mechanism will drive the sorting material plate to the direction of the garbage. The corresponding direction is inclined, and the auxiliary blanking mechanism can be used for blanking.

Further, preferably, the auxiliary blanking mechanism includes an angle mounting plate and an air jet head, the angle mounting plate is mounted on the sorting material plate, the air jet head is fixed on the angle mounting plate, and the third The air jet directions of the air jet heads on both sides of the garbage feeding port are respectively directed towards the first garbage feeding port and the second garbage feeding port.

Further, preferably, the upper end of the sorting material plate is arranged in an arc shape along the front and rear width directions of the flip cover, and one side of the sorting material plate is provided with a drive connection hole, and the output of the swing driving mechanism connected to the drive connection hole.

Further, preferably, the swing drive mechanism includes a swing rotation driver, a rotating base, a debugging slide and a debugging slide, the top of the support mounting frame is fixedly provided with the vertically extending debugging slide, and the debugging slide is The debugging sliding seat is provided on the rail which can be adjusted up and down and can be locked. The debugging sliding seat is fixedly provided with the horizontally extending connecting column, and the end of the connecting column is fixedly connected with the swinging and rotating driver. , the output end of the swinging rotary driver is connected to the rotating seat, the end of the rotating seat is connected to the driving connecting hole, and the swinging direction of the swinging and rotating driver is the horizontal axis direction.

Further, preferably, one side or both sides of the support mounting frame is also provided with a reinforced stable frame, and the visual inspection and analysis assembly includes an angle adjustment rod, a high-definition camera and an auxiliary lighting lamp, and the angle adjustment rod is fixed on the The high-definition camera is connected to the end of the angle adjustment rod, and the auxiliary lighting is also provided on one side or around the high-definition camera. After the flip cover is opened, the auxiliary lighting The light can be turned on automatically.

Further, as a preference, the bottom of the inner box body is also provided with a positioning slot below the opening slot, the bottom of the garbage hopper is limited in the positioning slot, and the bottom of the positioning slot is also provided with There is an auxiliary mechanism, the lower end of the auxiliary mechanism is fixed with the inner box, the auxiliary mechanism includes a casing, a motor, a jacking device, a first fixing rod, a second fixing rod and a top plate, and the inner bottom of the casing is fixed with the motor , the upper end of the motor is connected with the lifting device, the lower right end of the lifting device is fixed with the first fixing rod, the upper left end of the lifting device is fixed with the second fixing rod, and the upper end of the lifting device is fixed with the second fixing rod. The top plate is fixed by welding, the lower end of the outer shell is fixed with the inner box body, and the upper end of the top plate is closely attached to the garbage hopper.

Further, preferably, the front side of the lower end of the outer main body is provided with a foot pedal for controlling the flip, the front end of the outer main body is fixed into an integral body with a movable plate, the movable plate is provided with a second handle, and the movable plate is used for Seal the open slot.

Further, preferably, the lifting device includes a rotating shaft, a first limit block, a first fixed block, a convex block, a second fixed block, a limit plate, a top rod, a spring, a second limit block and a slotted hole The upper end of the rotating shaft is connected with the first limiting block, the upper end of the rotating shaft is fixed with the first fixing block, the upper end of the first fixing block is fixed with the convex block, and the upper end of the convex block is integrated with the first fixing block. The two fixing blocks are in close contact with each other, the middle part of the upper end of the second fixing block is fixed into one body with the limit plate, the upper end of the limit plate and the ejector rod are fixed by welding, the upper end of the limit plate is fixed with the spring into one body, the The upper end of the ejector rod is penetratingly connected with the second limiting block, the lower end of the second fixing block is provided with a slot hole, the lower end of the rotating shaft is fixed with the motor, and the upper end of the ejector rod is fixed integrally with the top plate.

Further, preferably, there are two first fixing rods in total, and the first fixing rods are symmetrically distributed along the lateral center axis of the casing, the top plate is elongated, and the upper surface of the top plate is provided with anti-skid lines.

Further, preferably, the protruding blocks are hemispherical, and the protruding blocks are distributed in an annular array along the center of the first fixing block; the second fixing block is pie-shaped.

(3) Beneficial effects

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention is a garbage sorting device for tourist attractions. When the garbage is thrown in, the garbage is thrown into the third garbage feeding port through the flip cover and falls onto the control valve plate. The visual detection and analysis component The garbage can be identified and analyzed for its classification. If the garbage is the third garbage, the control valve plate will be opened and dropped into the garbage bucket in the middle. If the garbage is the first garbage or the second garbage, Then, the swing driving mechanism drives the sorting material plate to incline in the corresponding direction, and the auxiliary feeding mechanism is used to unload the material, and the garbage can be sorted automatically;

(2) The irradiation cutting mechanism of the present invention can automatically classify the garbage by means of air jet, which is convenient for the garbage to be discharged into the corresponding garbage hopper, and effectively improves the efficiency and reliability of garbage classification;

(3) In the present invention, the auxiliary mechanism is arranged at the inner bottom of the inner box, and the motor output shaft drives the jacking device to start working, so that the jacking device is ejected from the upper end of the casing, and then the jacking rod is convenient for lifting and supporting the garbage hopper, so as to achieve In order to save time and effort, by setting the jacking device inside the casing, the output of the motor drives the rotating shaft to rotate, so that the bump and the second fixed block cooperate to work together, and then the spring is compressed, and the ejector rod is lifted upward to avoid garbage. The bucket is dumped on the ground, which enhances the advantages of working efficiency.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the partial front view structure schematic diagram of the present invention;

Fig. 3 is the front view structure schematic diagram of the auxiliary mechanism of the present invention;

4 is a schematic structural diagram of the jacking device of the present invention;

5 is a schematic diagram of the partial structure of the second fixed block of the present invention;

6 is a schematic structural diagram of a classification mechanism of the present invention;

FIG. 7 is a schematic view of the structure of the sorting material plate of the present invention;

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Please refer to FIGS. 1-7 , the present invention provides a garbage sorting device in tourist attractions, including an inner box 1, an outer main body 8, a flip 4, a garbage hopper 5 and a sorting mechanism, wherein the inner box 1 is arranged in the Inside the outer main body, there are three opening grooves on the front side of the bottom side of the inner box body, each of the opening grooves is respectively provided with a garbage hopper, the top of the inner box body is open, and the inner box body is open. The sorting mechanism fixed on the outer body is arranged above the opening of the top of the box body, and a flip cover 4 is provided in the middle position of the top of the outer body to facilitate throwing garbage. It is characterized in that the sorting mechanism is located on the flip cover. Directly below, the classification mechanism includes a visual inspection and analysis assembly, a swing drive mechanism, a support installation frame 11, a classification material plate 18 and an auxiliary blanking mechanism, wherein the visual inspection and analysis assembly is fixed on the support installation frame. The top of the swing drive mechanism is fixed at the middle position of the support and installation frame, the output end of the swing drive mechanism is connected with the classification material plate 18, and the swing drive mechanism can drive the classification material plate to swing. The two ends of the sorting board 18 are respectively extended to the top of the garbage hoppers on both sides. One side of the sorting board is provided with a first garbage feeding port 180, and the other side of the sorting board is provided with There is a second garbage feeding port 182, a third garbage feeding port is provided in the middle position of the sorting material plate, and a control valve plate 181 is provided on the third garbage feeding port. Both sides are respectively provided with the auxiliary feeding mechanism facing oppositely, the upper part of the third garbage feeding port is set up facing the flip cover, and the control valve plate is in a normally closed state;

When throwing garbage, the garbage is thrown into the third garbage feeding port through the flip cover and falls onto the control valve plate, and the visual detection and analysis component can identify the garbage and analyze its classification. If the garbage is the third garbage, the control valve plate will fall into the middle garbage hopper when the control valve plate is opened. If the garbage is the first garbage or the second garbage, the swing driving mechanism will drive the sorting material plate to the direction of the garbage. The corresponding direction is inclined, and the auxiliary blanking mechanism can be used for blanking.

In this embodiment, the auxiliary blanking mechanism includes an angle mounting plate 20 and an air jet head 19, the angle mounting plate is mounted on the sorting material plate, and the air jet head is fixed on the angle mounting plate, so The air jet directions of the air jet heads on both sides of the third garbage feeding port are respectively directed towards the first garbage feeding port and the second garbage feeding port.

The upper end of the sorting material plate is arranged in an arc shape along the front and rear width directions of the flip cover, and one side of the sorting material plate is provided with a drive connection hole 183, and the output end of the swing driving mechanism is connected to the the drive connection hole.

The swing drive mechanism includes a swing rotation driver 16, a rotating base 17, a debugging slide 15 and a debugging slide 12. The top of the support mounting frame 11 is fixedly provided with the vertically extending debugging slide rail. The debugging sliding seat is provided on the rail which can be adjusted up and down and can be locked. The debugging sliding seat is fixedly provided with the horizontally extending connecting column, and the end of the connecting column is fixedly connected with the swinging and rotating driver. , the output end of the swinging rotary driver is connected to the rotating seat, the end of the rotating seat is connected to the driving connecting hole, and the swinging direction of the swinging and rotating driver is the horizontal axis direction.

One side or both sides of the support and installation frame 11 is also provided with a strengthening and stable frame 13, and the visual inspection and analysis assembly includes an angle adjustment rod, a high-definition camera and an auxiliary lighting lamp, and the angle adjustment rod is fixed on the support installation. The high-definition camera is connected to the end of the angle adjustment rod, and the auxiliary lighting is also provided on one side or around the high-definition camera. After the flip cover is opened, the auxiliary lighting can automatically lights up.

The bottom of the inner box is located below the opening slot and is also provided with a positioning slot, the bottom of the garbage hopper is limited in the positioning slot, and the bottom of the positioning slot is also provided with an auxiliary mechanism 2, The lower end of the auxiliary mechanism 2 is fixed with the inner box 1 , and the auxiliary mechanism 2 includes a casing 21 , a motor 22 , a jacking device 23 , a first fixing rod 24 , a second fixing rod 25 and a top plate 26 . The outer casing 21 The inner bottom is fixed with the motor 22, the upper end of the motor 22 is connected with the jacking device 23, the lower right end of the jacking device 23 is fixed with the first fixing rod 24, and the upper left end of the jacking device 23 is fixed with the second The rod 25 is fixed into one body, the upper end of the jacking device 23 is fixed to the top plate 26 by welding, the lower end of the outer casing 21 is fixed to the inner box 1 , and the upper end of the top plate 26 is tightly fitted with the garbage hopper 5 .

The front side of the lower end of the outer main body 1 is provided with a foot pedal 7 for controlling the flip, the front end of the outer main body is fixed into an integral body with a movable plate 9, and the movable plate 9 is provided with a second handle 10, and the movable plate is used for Seal the open slot.

The jacking device 23 includes a rotating shaft 231, a first limiting block 232, a first fixing block 233, a convex block 234, a second fixing block 235, a limiting plate 236, an ejector rod 237, a spring 238, a second limiting block The upper end of the rotating shaft 231 is connected with the first limiting block 232, the upper end of the rotating shaft 231 is fixed with the first fixing block 233, and the upper end of the first fixing block 233 is connected with the convex block 239. 234 is fixed into one body, the upper end of the protruding block 234 is in close contact with the second fixing block 235, the middle part of the upper end of the second fixing block 235 is fixed into one body with the limit plate 236, and the upper end of the limit plate 236 is connected with the ejector rod 237. By welding, the upper end of the limiting plate 236 and the spring 238 are fixed into one body, and the upper end of the ejector rod 237 is connected to the second limiting block 239 throughly. The lower end of the second fixing block 235 is provided with a slot 2310. The lower end of the rotating shaft 231 is fixed with the motor 22 , and the upper end of the top rod 237 is fixed integrally with the top plate 26 .

There are two first fixing rods 24 , and the first fixing rods 24 are symmetrically distributed along the lateral center axis of the casing 21 .

The bumps 234 are hemispherical, and the bumps 234 are distributed in a circular array along the center of the first fixing block 233; the second fixing block 235 is a round cake. 22 works, so that the output shaft of the motor 22 drives the rotating shaft 231 to start rotating, and then the first fixed block 233 starts to make a circular motion. The positioning block 239 is tightly fitted, and then when the protrusion 234 slides out of the slot 2310, the protrusion 234 lifts the second fixing block 235 upward, so that the spring 238 begins to compress, and then the ejector rod 237 moves from the second limit The upper end of the block 239 slides; then the top plate 26 pushes the garbage hopper 5 upward, and then the user grabs the first handle 6 and pulls the garbage hopper 5 out of the inner box 1 , thereby facilitating the user to replace the garbage hopper 5 .

The present invention relates to a garbage sorting device in tourist attractions. When the garbage is thrown in, the garbage is thrown into the third garbage feeding port through a flip cover and falls onto the control valve plate, and the visual detection and analysis component can detect and analyze the garbage. The garbage is identified and analyzed to find out its classification. If the garbage is the third garbage, the control valve plate will be opened and it will fall into the garbage bucket in the middle. If the garbage is the first garbage or the second garbage, the said garbage The oscillating drive mechanism drives the sorting material plate to incline in the corresponding direction, and the auxiliary feeding mechanism can be used to unload the material, and the garbage can be sorted automatically; The garbage can be automatically classified, which is convenient for the garbage to be discharged into the corresponding garbage hopper, and effectively improves the efficiency and reliability of garbage classification. In the present invention, an auxiliary mechanism is arranged at the inner bottom of the inner box, and the motor output shaft drives the jacking device to work. , so that the jacking device is ejected from the upper end of the shell, and then it is convenient for the ejector rod to lift and support the garbage hopper, which achieves the advantages of saving time and labor. The protruding block cooperates with the second fixing block, so that the spring is compressed and the ejector rod is lifted upward, so as to prevent the garbage bucket from being dumped on the ground and enhance the working efficiency.

Claims (10)

1. A tourist attraction garbage classification device comprises an inner box body (1), an outer main body (8), a turnover cover (4), a garbage hopper (5) and a classification mechanism, wherein the inner box body (1) is arranged inside the outer main body, the front side of the bottom side of the inner box body is provided with three open slots, each open slot is internally provided with a garbage hopper, the top opening of the inner box body is provided with the classification mechanism fixed on the outer main body above the top opening of the inner box body, the middle position of the top of the outer main body is provided with the turnover cover (4) convenient for putting garbage, the device is characterized in that the classification mechanism is positioned under the turnover cover, the classification mechanism comprises a visual detection and analysis component, a swing driving mechanism, a support mounting frame (11), a classification plate (18) and an auxiliary blanking mechanism, wherein, the visual detection and analysis assembly is fixed at the topmost part of the support mounting frame, the swing driving mechanism is fixed at the middle position of the support mounting frame, the output end of the swing driving mechanism is connected with the classification plate (18), the swing driving mechanism can drive the classification plate to swing and incline, two ends of the classification plate (18) respectively extend to the upper parts of the garbage hoppers at two sides, one side of the classification plate is provided with a first garbage feeding port (180), the other side of the classification plate is provided with a second garbage feeding port (182), the middle position of the classification plate is provided with a third garbage feeding port, a control valve plate (181) is arranged on the third garbage feeding port, two sides of the third garbage feeding port are respectively provided with the auxiliary blanking mechanisms with opposite directions, and the upper part of the third garbage feeding port is over against the turnover cover, the control valve plate is in a normally closed state;

when putting in rubbish, rubbish is put in through flip to third rubbish pan feeding mouth drops extremely on the control valve plate, visual detection and analysis subassembly can discern this rubbish and analyze out its affiliated classification, if this rubbish is the third rubbish, then the control valve plate is opened and is dropped promptly to the middle rubbish fill in, if this rubbish is first rubbish or second rubbish, then swing actuating mechanism drive categorised flitch inclines to corresponding direction, and utilize supplementary unloading mechanism unloading can.

2. A tourist attraction waste classification apparatus according to claim 1, characterised in that: supplementary unloading mechanism includes angle mounting disc (20) and jet-propelled head (19), the angle mounting disc is installed on the categorised flitch, the jet-propelled head is fixed on the angle mounting disc, the jet-propelled direction of the jet-propelled head of third rubbish pan feeding mouth both sides is respectively towards first rubbish pan feeding mouth and second rubbish pan feeding mouth.

3. A tourist attraction waste classification apparatus according to claim 1, characterised in that: the upper end of the classification flitch is arranged along the front width direction and the rear width direction of the turnover cover in an arc shape, one side of the classification flitch is provided with a driving connecting hole (183), and the output end of the swing driving mechanism is connected to the driving connecting hole.

4. A tourist attraction waste classification apparatus according to claim 3, wherein: swing actuating mechanism includes swing swivel drive ware (16), roating seat (17), debugging slide (15) and debugging slide rail (12), the fixed vertical extension that is provided with in top of supporting mounting bracket (11) the debugging slide rail, but on the debugging slide rail adjust from top to bottom and lockable be provided with the debugging slide seat, the fixed spliced pole that is provided with the level and extends on the debugging slide seat, the tip fixedly connected with of spliced pole swing swivel drive ware, swing swivel drive ware's output is connected to the roating seat, the end connection of roating seat to the drive connecting hole, swing swivel drive ware's rotatory swing direction is the horizontal axis direction.

5. The tourist attraction garbage classification device of claim 4, wherein: support one side or both sides of mounting bracket (11) and still be provided with and strengthen steady frame (13), visual detection and analysis subassembly include angle adjusting rod, high definition digtal camera and auxiliary lighting lamp, angle adjusting rod fixes support the top of mounting bracket, high definition digtal camera connects the tip of angle adjusting rod, one side of high definition digtal camera is perhaps still provided with on every side auxiliary lighting lamp, flip opens the back, auxiliary lighting lamp can light automatically.

6. A tourist attraction waste classification apparatus according to claim 1, characterised in that: the garbage bin is characterized in that a positioning clamping groove is further arranged at the bottom of the inner bin body and below the open groove, the bottom of the garbage bin is limited in the positioning clamping groove, an auxiliary mechanism (2) is further arranged at the bottom of the positioning clamping groove, the lower end of the auxiliary mechanism (2) is fixed with the inner bin body (1), the auxiliary mechanism (2) comprises a shell (21), a motor (22), a jacking device (23), a first fixing rod (24), a second fixing rod (25) and a top plate (26), the bottom of the inner side of the shell (21) is fixed with the motor (22), the upper end of the motor (22) is connected with the jacking device (23), the right lower end of the jacking device (23) is fixed with the first fixing rod (24), the upper left end of the jacking device (23) is fixed with the second fixing rod (25) into a whole, and the upper end of the jacking device (23) is fixed with the top plate (26) through welding, the lower end of the outer shell (21) is fixed with the inner box body (1), and the upper end of the top plate (26) is tightly attached to the garbage hopper (5).

7. A tourist attraction waste classification apparatus according to claim 6, wherein: the front side of the lower end of the outer main body (1) is provided with a pedal (7) for controlling the turnover cover, the front end of the outer main body is fixed with a movable plate (9) into a whole, a second handle (10) is arranged on the movable plate (9), and the movable plate is used for sealing the open slot.

8. A tourist attraction waste classification apparatus according to claim 6, wherein: the jacking device (23) comprises a rotating shaft (231), a first limiting block (232), a first fixing block (233), a convex block (234), a second fixing block (235), a limiting plate (236), a push rod (237), a spring (238), a second limiting block (239) and a slotted hole (2310), wherein the upper end of the rotating shaft (231) is in through connection with the first limiting block (232), the upper end of the rotating shaft (231) is fixed with the first fixing block (233), the upper end of the first fixing block (233) is fixed with the convex block (234) into a whole, the upper end of the convex block (234) is tightly attached to the second fixing block (235), the middle part of the upper end of the second fixing block (235) is fixed with the limiting plate (236) into a whole, the upper end of the limiting plate (236) is fixed with the push rod (237) by welding, the upper end of the limiting plate (236) is fixed with the spring (238) into a whole, and the upper end of the push rod (237) is in through connection with the second limiting block (239), the lower end of the second fixing block (235) is provided with a slotted hole (2310), the lower end of the rotating shaft (231) is fixed with the motor (22), and the upper end of the ejector rod (237) is fixed with the top plate (26) into a whole.

9. A tourist attraction waste classification apparatus according to claim 8, wherein: the first fixing rods (24) are arranged in two, the first fixing rods (24) are symmetrically distributed along the transverse central axis of the shell (21), the top plate (26) is long, and anti-skid grains are arranged on the upper end surface of the top plate (26).

10. A tourist attraction waste classification apparatus according to claim 8, wherein: the bumps (234) are hemispherical, and the bumps (234) are distributed in an annular array along the circle center of the first fixed block (233); the second fixed block (235) is in a round cake shape.

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