CN212237625U

CN212237625U - Geological soil prosthetic devices

Info

Publication number: CN212237625U
Application number: CN202020459921.5U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shandong Jiali Intelligent Technology Co ltd
Current assignee: Hubei Physical And Chemical Analysis And Testing Center Co ltd; Zhongke Testing Group Ecological Monitoring Wuhan Co ltd; Zhongke Testing Group Guangdong Soil Environmental Science Research Institute Co ltd
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-12-29
Anticipated expiration: 2030-04-01

Abstract

The utility model discloses a geological soil prosthetic devices, the power distribution box comprises a box body, the inside of box is equipped with soil repair mechanism, the top rigid coupling of box has the feeder hopper, logical groove has been seted up on the right surface top of box, the right surface bottom rigid coupling of box has the row to fight. This geology soil prosthetic devices, through the box, soil repair mechanism, the feeder hopper, lead to the cooperation between groove and the row's hopper, to wait to restore the inside that soil put in the box through the feeder hopper, the while is circular telegram the suction pump, can make the soil remediation agent of the liquid storage bucket inside spout to the soil of whereabouts, can be favorable to waiting to restore soil and repair liquid and carry out abundant contact, and then can make the prosthetic effect of soil promote, the sieve can filter the soil that enters into the box inside simultaneously, make great stereoplasm non-soil material be located the sieve top, careful soil after the restoration is discharged through arranging the hopper, practicality can promote.

Description

Geological soil prosthetic devices

Technical Field

The utility model relates to a soil remediation technical field specifically is a geological soil prosthetic devices.

Background

Geological soil restoration is the technical measure who makes the soil that suffers the pollution resume normal function, to the prosthetic in-process of geological soil, needs to use geological soil restoration processing apparatus, satisfies people's demand, for example application number 201820900874.6's patent, including the sweep, the upper end right side of sweep is equipped with pushes away the handle, the upper end of pushing away the handle is equipped with DSP controller and soil detection appearance, soil detection appearance and DSP controller electric connection, though can play and restore geological soil, but in the in-service use in-process, only spray soil remediation agent on the surface of soil alone, and the contact with the soil of waiting to restore is not enough even abundant, and the prosthetic effect of soil remains to be strengthened, and can't filter the non-soil material of great stereoplasm in the soil and discharge, and the practicality is general.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a geological soil prosthetic devices to solve the above-mentioned background art in put forward can play and restore geological soil, but in the in-service use, only spray soil remediation agent on the surface of soil alone, with treat that the contact of restoreing soil is not even enough abundant, the prosthetic effect of soil remains to be strengthened, and can't filter the discharge with the non-soil material of great stereoplasm in the soil, practicality general problem.

In order to achieve the above object, the utility model provides a following technical scheme: a geological soil restoration device comprises a box body, wherein a soil restoration mechanism is arranged inside the box body, a feed hopper is fixedly connected to the top end of the box body, a through groove is formed in the top end of the right surface of the box body, and a discharge hopper is fixedly connected to the bottom end of the right surface of the box body;

the soil remediation mechanism comprises a sieve plate, a bump, a cross bar, a baffle, a bent bar, a pasting plate, a vertical cylinder, a base, a liquid storage barrel, a connecting pipe, a water pump and a spray head;

the sieve plate is positioned below the inner center of the box body, the front end and the rear end of the left side and the right side of the lower surface of the sieve plate are fixedly connected with convex blocks, a cross bar is inserted into the outer side surface of the convex block, the outer side end of the cross bar is fixedly connected with the inner wall of the box body, the periphery of the upper surface of the sieve plate is provided with a baffle plate, the right surface of the sieve plate is rotatably connected with a bent rod, the other end of the bent rod is fixedly connected with a flitch, the flitch is connected with the outer surface of the right baffle, the top end of the vertical cylinder is fixedly connected with the periphery of the center of the top end in the box body, the two bases are respectively and fixedly connected with the left side and the right side of the upper surface of the box body, the inner wall of the base is fixedly connected with a liquid storage barrel, the outer side of the bottom end of the outer wall of the liquid storage barrel is fixedly connected with a connecting pipe, the water suction pump is installed on the pipeline of the connecting pipe, the connecting pipe penetrates through the base, the box body and a part of the vertical cylinder in sequence, and the spray head is installed at the other end of the connecting pipe. Can make the prosthetic effect of soil promote, the sieve can filter the soil that enters into the box inside simultaneously.

Preferably, the left side of the inner bottom end of the box body is higher than the bottom end of the inner right side by 10-40 cm. The material of the inside bottom of box of being convenient for is discharged to the right side.

Preferably, the cross rod and the bump form a sliding limiting structure. The stability of the sieve plate during sliding left and right can be increased.

Preferably, a sieve plate driving mechanism is arranged on the left surface of the box body;

the sieve plate driving mechanism comprises a supporting plate, a motor, a short rod, a supporting plate, an inclined wheel, a push plate and a trapezoidal wheel;

the utility model discloses a sieve plate, including the layer board, the layer board rigid coupling is in the left surface bottom of box, the motor is installed in the upper surface left side of layer board, the right side rigid coupling of motor has the quarter butt, the extension board has been cup jointed in the outer wall center left side of quarter butt, the bottom of extension board links to each other with the last fixed surface of layer board, the push pedal has been inserted on the left surface top of extension board, the push pedal runs through a part of extension board and box in proper order and the sieve is fixed continuous, the outer wall right side of quarter butt is fixed to be cup jointed the bevel wheel, the laminating of the two sides top has trapezoidal wheel about the bevel wheel, the top of trapezoidal. Can be favorable to improving the filtration soil efficiency of sieve, also can further be favorable to mutual abundant contact mixing between soil and the soil remediation agent simultaneously.

Preferably, the lower surface rigid coupling of layer board has the down tube, and the other end of down tube and the outer wall of box are fixed continuous. The diagonal rods can increase the stability between the supporting plate and the box body.

Preferably, a soil smashing mechanism is arranged above the upper surface of the sieve plate;

the soil breaking mechanism comprises a circular plate, a supporting rod, a vertical rod, a first disc, an upright post, a second disc, a grinding block, a tooth ring, a tooth post, a rotating rod, a first belt pulley, a second belt pulley and a belt;

the circular plate is positioned in the center of the interior of the vertical cylinder, the left side and the right side of the circular plate are fixedly connected with supporting rods, the other ends of the supporting rods are fixedly connected with the inner wall of the vertical cylinder, a vertical rod is rotatably connected at the center of the lower surface of the circular plate, a first circular plate is fixedly connected at the bottom end of the vertical rod, the center of the lower surface of the first disc is fixedly connected with an upright post, the bottom end of the upright post is fixedly connected with the upper surface of the second disc, the lower surface of the second disc is fixedly connected with a plurality of grinding blocks, the inner side of the periphery of the lower surface of the second disc is fixedly connected with a tooth ring, the left side of the bottom end of the tooth ring is engaged with a tooth column, the center of the left side of the tooth column is fixedly connected with a rotating rod, the rotating rod penetrates through the baffle plate and the box body in sequence, a first belt pulley is fixedly connected with the left end part of the rotating rod, the inner wall of second belt pulley links to each other with the outer wall of quarter butt is fixed, the second belt pulley passes through the belt and rotates with first belt pulley and link to each other. Can make the abrasive brick of second disc lower surface grind the soil on the sieve and smash, be favorable to the restoration of soil to filter screening operation.

Preferably, rubber rings are fixedly connected to the periphery of the surface between the first disc and the second disc. The tooth column is favorable for stably transmitting the tooth ring.

Preferably, the two struts are symmetrical to the left and right with respect to the center point of the circular plate. The two support rods can uniformly apply force to the circular plate.

Compared with the prior art, the beneficial effects of the utility model are that: this geology soil prosthetic devices for traditional technique, has following advantage:

through the box, soil repair mechanism, the feeder hopper, lead to the cooperation between groove and the row's hopper, will wait to restore the inside that soil put in the box through the feeder hopper, switch on the suction pump simultaneously, can make the soil repairing agent of depositing liquid bucket inside spout to the soil of whereabouts, can be favorable to waiting to restore soil and repair liquid and carry out the abundant contact, and then can make the prosthetic effect of soil promote, the sieve can filter the soil that enters into the box inside simultaneously, make great stereoplasm non-soil material be located the sieve top, the careful soil after the restoration is discharged through arranging the hopper, practicality can promote.

Through the box, the cooperation between soil repair mechanism and the sieve actuating mechanism, after treating that prosthetic soil enters into the box through the feeder hopper, the motor supplies power and makes the quarter butt rotate, can make the bevel wheel carry out application of force transmission to trapezoidal wheel, can make the push pedal carry out clearance motion about, can make the sieve carry out reciprocating motion about, can do benefit to the filtration soil efficiency that improves the sieve, also can further do benefit to mutual abundant contact mixture between soil and the soil remediation agent simultaneously.

Through the box, soil repair mechanism, sieve actuating mechanism and soil smash the cooperation between the mechanism, at motor circular telegram quarter butt pivoted in-process, the second belt pulley can carry out application of force transmission to first belt pulley through the belt, can make bull stick and tooth post rotate, tooth post can carry out the transmission to tooth ring and make first disc and second disc rotate, can make the abrasive brick of second disc lower surface grind the soil on the sieve and smash, be favorable to the restoration of soil to filter the screening operation.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view showing a connection structure of the tank, the vertical tube and the spray head of FIG. 1;

FIG. 3 is a schematic view of a connection structure of the screen plate, the baffle plate and the second disk of FIG. 1;

fig. 4 is a schematic view of a connection structure of the motor, the bevel wheel and the push plate in fig. 1.

In the figure: 1. the device comprises a box body, 2, a soil remediation mechanism, 201, a sieve plate, 202, a bump, 203, a cross bar, 204, a baffle, 205, a bent rod, 206, a pasting plate, 207, a vertical cylinder, 208, a base, 209, a liquid storage barrel, 210, a connecting pipe, 211, a water pump, 212, a spray head, 3, a soil smashing mechanism, 301, a circular plate, 302, a support rod, 303, a vertical rod, 304, a first circular disk, 305, a vertical column, 306, a second circular disk, 307, a grinding block, 308, a tooth ring, 309, a tooth column, 310, a rotating rod, 311, a first belt pulley, 312, a second belt pulley, 313, a belt, 4, a sieve plate driving mechanism, 401, a supporting plate, 402, a motor, 403, a short rod, 404, a supporting plate, 405, a bevel wheel, 406, a push plate, 407, a trapezoidal wheel, 5, a feed hopper, 6, a through groove, 7 and a discharge.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a geological soil restoration device comprises a box body 1, a soil restoration mechanism 2 is arranged inside the box body 1, a feed hopper 5 is fixedly connected to the top end of the box body 1, the feed hopper 5 is communicated with the box body 1, a through groove 6 is formed in the top end of the right surface of the box body 1, a discharge hopper 7 is fixedly connected to the bottom end of the right surface of the box body 1, the discharge hopper 7 is communicated with the box body 1, the soil restoration mechanism 2 comprises a sieve plate 201, a bump 202, a cross rod 203, a baffle 204, a bent rod 205, a pasting plate 206, a vertical cylinder 207, a base 208, a liquid storage barrel 209, a connecting pipe 210, a water suction pump 211 and a spray head 212, the sieve plate 201 is positioned below the inner center of the box body 1, the sieve plate 201 is made of stainless steel with bumps distributed on the surface, the mesh number is 0.5-2, the bumps 202 are fixedly connected to the front and rear ends of the left and right sides of the lower surface of the sieve plate 201, the outer side end of the cross rod 203 is fixedly connected with the inner wall of the box body 1, the periphery of the upper surface of the sieve plate 201 is provided with baffle plates 204, the baffle plates 204 at the front end and the rear end of the left side are fixedly connected with the sieve plate 201, the right baffle plate 204 is rotatably connected with the sieve plate 201 through a pin shaft, the right surface of the sieve plate 201 is rotatably connected with a bent rod 205, the bent rod 205 is rotatably connected with the right surface of the sieve plate 201 through a dustproof bearing, the other end of the bent rod 205 is fixedly connected with a pasting plate 206, the pasting plate 206 is connected with the outer surface of the right baffle plate 204, the pasting plate 206 is in threaded connection with the right baffle plate 204 through a bolt, the top end of a vertical cylinder 207 is fixedly connected with the periphery of the center of the top end of the interior of the box body 1, two bases 208 are respectively fixedly connected with the left side and the right side of the upper surface of the box body 1, the, connecting pipe 210 and deposit liquid bucket 209 each other and be linked together, install suction pump 211 on connecting pipe 210's the pipeline, suction pump 210's model is LY-JLM, and suction pump 210's power cord and external power supply unit dock mutually, connecting pipe 210 runs through base 208 in proper order, box 1 and a part of vertical cylinder 207, shower nozzle 212 is installed to connecting pipe 210's the other end, the inside bottom left side of box 1 is higher than 10-40cm for inside right side bottom, be convenient for the material of the inside bottom of box 1 discharges to the right side, horizontal pole 203 constitutes the slip limit structure with lug 202, lug 202 can carry out the horizontal slip on the outer wall of horizontal pole 203, stability when can increase sieve 201 horizontal slip.

The left surface of the box body 1 is provided with a screen plate driving mechanism 4, the screen plate driving mechanism 4 comprises a supporting plate 401, a motor 402, a short rod 403, a supporting plate 404, an oblique wheel 405, a push plate 406 and a trapezoidal wheel 407, the supporting plate 401 is fixedly connected to the bottom end of the left surface of the box body 1, the motor 402 is installed on the left side of the upper surface of the supporting plate 401, the model of the motor 402 is ECMA-E11320RS, the power cord of the motor 402 is butted with an external power supply device, the short rod 403 is fixedly connected to the right side of the motor 402, the output shaft of the motor 402 is fixedly connected with the short rod 403, the supporting plate 404 is sleeved on the left side of the center of the outer wall of the short rod 403, the supporting plate 404 is rotatably connected with the short rod 403 through a ball bearing, the bottom end of the supporting plate 404 is fixedly connected with the upper surface of the supporting plate 401, the top end of the left surface of the supporting plate 404, the contact surface clearance fit of push pedal 406 and box 1, the fixed bevel wheel 405 that has cup jointed in the outer wall right side of quarter butt 403, the laminating of two sides top has trapezoidal wheel 407 about the bevel wheel 405, the top of trapezoidal wheel 407 rotates with the lower surface of push pedal 406 and links to each other, trapezoidal wheel 407 rotates with push pedal 406 through ball bearing and links to each other, the lower surface rigid coupling of layer board 401 has the down tube, and the other end of down tube links to each other with the outer wall of box 1 is fixed, the down tube can increase the stability between layer board 401 and the box 1.

The soil smashing mechanism 3 is arranged above the upper surface of the sieve plate 201, the soil smashing mechanism 3 comprises a circular plate 301, a supporting rod 302, a vertical rod 303, a first circular plate 304, a vertical column 305, a second circular plate 306, a grinding block 307, a tooth ring 308, a tooth column 309, a rotating rod 310, a first belt pulley 311, a second belt pulley 312 and a belt 313, the circular plate 301 is positioned in the inner center of the vertical cylinder 207, the supporting rod 302 is fixedly connected to the left side and the right side of the circular plate 301, the other end of the supporting rod 302 is fixedly connected with the inner wall of the vertical cylinder 207, the vertical rod 303 is rotatably connected to the center of the lower surface of the circular plate 301 through a sealing bearing, the vertical rod 303 is rotatably connected with the circular plate 301, the first circular plate 304 is fixedly connected to the center of the lower surface of the first circular plate 304, the vertical rod 305 is fixedly connected to the bottom end of the vertical rod 305 and the upper surface of the second circular plate 306, the lower surface of the second circular plate 306, tooth column 309 is connected with the meshing of the left side of the bottom of tooth ring 308, tooth column 309's left side center rigid coupling has a bull stick 310, bull stick 310 runs through baffle 204 and box 1 in proper order, bull stick 310 rotates with baffle 204 and box 1 through two sealed bearings respectively and links to each other, the left side tip rigid coupling of bull stick 310 has first belt pulley 311, the inner wall of second belt pulley 312 is fixed with the outer wall of quarter butt 403 and links to each other, second belt pulley 312 rotates with first belt pulley 311 through belt 313 and links to each other, equal rigid coupling has the rubber ring around the surface between first disc 304 and the second disc 306, the rubber ring is made for the rubber material, certain toughness has, do benefit to tooth column 309 stable to carry out the transmission to tooth ring 308, two branch 302 are for the central point bilateral symmetry of plectane 301, can make two branch 302 carry out even application of force to plectane 301.

When the geological soil restoration device is used, firstly, soil to be restored is put into the box body 1 through the feed hopper 5, the water suction pump 211 and the motor 402 are electrified, soil restoration agent in the liquid storage barrel 209 can be drawn out after the water suction pump 211 is powered, the soil is sprayed to falling soil through the spray nozzle 212, the soil to be restored can be in full contact with the restoration liquid, meanwhile, the sieve plate 201 can filter the soil entering the box body 1, the motor 402 is powered to rotate the short rod 403, the bevel wheel 405 can apply force to the trapezoidal wheel 407 for transmission, the push plate 406 can perform left-right gap motion, the sieve plate 201 can perform left-right reciprocating motion, the soil filtering efficiency of the sieve plate 201 can be improved, and meanwhile, the soil and the soil restoration agent can be in full contact and mixing, simultaneously second belt pulley 312 can carry out the application of force transmission to first belt 311 wheel through belt 313, can make bull stick 310 and tooth post 309 rotate, tooth post 309 can carry out the transmission to tooth ring 308, make first disc 304 and second disc 306 rotate, can make the abrasive brick 307 of second disc 306 lower surface grind the soil on the sieve 201 and smash, be favorable to the restoration of soil to filter the screening operation, the careful soil after the restoration discharges through arranging hopper 7, the practicality can promote.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a geological soil prosthetic devices, includes box (1), its characterized in that: a soil remediation mechanism (2) is arranged inside the box body (1), a feed hopper (5) is fixedly connected to the top end of the box body (1), a through groove (6) is formed in the top end of the right surface of the box body (1), and a discharge hopper (7) is fixedly connected to the bottom end of the right surface of the box body (1);

the soil remediation mechanism (2) comprises a sieve plate (201), a bump (202), a cross bar (203), a baffle (204), a bent rod (205), a pasting plate (206), a vertical cylinder (207), a base (208), a liquid storage barrel (209), a connecting pipe (210), a water pump (211) and a spray head (212);

the sieve (201) is located the inside center below of box (1), the equal rigid coupling in both ends has lug (202) around the lower surface left and right sides of sieve (201), lug (202) outside surface has inserted horizontal pole (203), the outside end of horizontal pole (203) links to each other with the inner wall of box (1) is fixed, the upper surface of sieve (201) all is equipped with baffle (204) all around, the right surface of sieve (201) rotates and is connected with knee (205), the other end rigid coupling of knee (205) has flitch (206), flitch (206) are connected with the surface of right side baffle (204), the top of a vertical section of thick bamboo (207) is fixed all around with the inside top center of box (1) and links to each other, two base (208) rigid coupling is in the upper surface left and right sides of box (1) respectively, the inner wall rigid coupling of base (208) has deposit liquid bucket (209), deposit the outer wall bottom outside rigid coupling of liquid bucket (209) and have connecting pipe (210), install suction pump (211) on the pipeline of connecting pipe (210), connecting pipe (210) run through some of base (208), box (1) and vertical section of thick bamboo (207) in proper order, shower nozzle (212) are installed to the other end of connecting pipe (210).

2. A geological soil remediation device as claimed in claim 1 wherein: the left side of the bottom end of the interior of the box body (1) is higher than the bottom end of the right side of the interior by 10-40 cm.

3. A geological soil remediation device as claimed in claim 1 wherein: the cross rod (203) and the lug (202) form a sliding limiting structure.

4. A geological soil remediation device as claimed in claim 1 wherein: a sieve plate driving mechanism (4) is arranged on the left surface of the box body (1);

the screen plate driving mechanism (4) comprises a supporting plate (401), a motor (402), a short rod (403), a supporting plate (404), an oblique wheel (405), a pushing plate (406) and a trapezoidal wheel (407);

the utility model discloses a sieve plate, including layer board (401), layer board (403), short bar (403), extension board (404), support board (403), sieve plate (201), oblique wheel (405) are fixed to the outer wall right side of short bar (403), the left surface bottom of layer board (401) is fixed in the left side of the upper surface of layer board (401), the right side rigid coupling of motor (402) has short bar (403), extension board (404) outer wall center left side has cup jointed extension board (404), the bottom of extension board (404) links to each other with the last fixed surface of layer board (401), push pedal (406) have been inserted on the left surface top of extension board (404), push pedal (406) run through partly and sieve (201) fixed continuous in proper order, the outer wall right side of short bar (403) is fixed to be cup jointed oblique wheel (405), the laminating of two sides top has trapezoidal wheel (407) about oblique wheel (405), the top of trapezoidal.

5. A geological soil remediation device as claimed in claim 4 wherein: the lower surface rigid coupling of layer board (401) has the down tube, and the other end of down tube links to each other with the outer wall of box (1) is fixed.

6. A geological soil remediation device as claimed in claim 1 wherein: a soil smashing mechanism (3) is arranged above the upper surface of the sieve plate (201);

the soil smashing mechanism (3) comprises a circular plate (301), a supporting rod (302), a vertical rod (303), a first circular plate (304), an upright post (305), a second circular plate (306), a grinding block (307), a tooth ring (308), a tooth column (309), a rotating rod (310), a first belt pulley (311), a second belt pulley (312) and a belt (313);

the utility model discloses a grinding wheel, including a circular plate (301), the inside center that the circular plate (301) is located a vertical section of thick bamboo (207), the equal rigid coupling in both sides has branch (302) about circular plate (301), the other end of branch (302) links to each other with the inner wall of a vertical section of thick bamboo (207) is fixed, the lower surface center of circular plate (301) rotates and is connected with montant (303), the bottom rigid coupling of montant (303) has first disc (304), the lower surface center rigid coupling of first disc (304) has stand (305), the bottom of stand (305) links to each other with the last fixed surface of second disc (306), the lower surface rigid coupling of second disc (306) has a plurality of abrasive bricks (307), the lower surface inboard rigid coupling all around of second disc (306) has tooth ring (308), the bottom left side meshing of tooth ring (308) is connected with tooth post (309), the left side center rigid coupling of tooth post (309) has bull stick (310), the baffle (204) and box (1) are run through in proper order in bull stick (310), the left side tip rigid coupling of bull stick (310) has first belt pulley (311), the inner wall of second belt pulley (312) links to each other with the outer wall of quarter butt (403) is fixed, second belt pulley (312) are passed through belt (313) and are rotated with first belt pulley (311) and link to each other.

7. A geological soil remediation device as claimed in claim 6 wherein: rubber rings are fixedly connected to the periphery of the surface between the first disc (304) and the second disc (306).

8. A geological soil remediation device as claimed in claim 6 wherein: the two supporting rods (302) are symmetrical left and right relative to the central point of the circular plate (301).