CN114467738B

CN114467738B - Dendrobium cultivation wall

Info

Publication number: CN114467738B
Application number: CN202210201761.8A
Authority: CN
Inventors: 何晨; 宋晓琴; 袁鹏辉; 胡蕾
Original assignee: Lu'an Kekodar Biotechnology Co ltd
Current assignee: Lu'an Kekodar Biotechnology Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2023-07-04
Anticipated expiration: 2042-03-03
Also published as: CN114467738A

Abstract

The utility model belongs to the technical field of dendrobium nobile cultivation, in particular to a dendrobium nobile cultivation wall, which aims at the problem of high maintenance cost caused by the need of monitoring nutrients in the wall in real time in the prior art. According to the utility model, the root of the dendrobium body can penetrate through the water absorption holes to absorb the residual nutrients on the water absorption cotton, certain moisture can be stored in the water collection clamping groove at the bottom of the water absorption cotton, the development space is enlarged by the root of the dendrobium body, and the growth is prevented from being influenced by the narrow space.

Description

Dendrobium cultivation wall

Technical Field

The utility model relates to the technical field of dendrobium nobile cultivation, in particular to a dendrobium nobile cultivation wall.

Background

At present, the common planting method of the traditional Chinese medicinal materials comprises the following steps: the method comprises the steps of performing ground planting in the soil on the ground, wherein the root system of the traditional Chinese medicinal materials is in contact with the soil, so that pests are easy to breed, and the soil can only be planted on the ground surface, and the plant quantity is greatly reduced because a plurality of planting spaces are not utilized, so that economic returns obtained by a plurality of traditional Chinese medicinal material planting farmers are very low, the rapid development of the traditional Chinese medicinal material planting industry cannot be truly promoted, the dendrobium candidum can be planted on the tree at present, but the space of one tree is limited, and the normal growth of the tree can be influenced by long-term planting on the tree; there is a need for a stereoscopic planting tool that can replace trees.

A dendrobium nobile planting wall disclosed by the retrieved Chinese patent number CN 201721087333.8. The existing dendrobium nobile planting wall has low planting density and poor thermal stability, and also constrains the growth of dendrobium nobile root systems; a clamping cavity is formed between the inner wall and the outer wall; the inner wall and the outer wall are provided with planting holes which lead to the clamping cavity; the bottoms of the inner wall and the outer wall are provided with water outlets which lead to the clamping cavity; however, the planting method needs to continuously inject nutrients and water into the inner cavity so as to ensure that the interior is moist, thereby wasting a great deal of cost; therefore, a new type of planting wall that can maintain nutrients for a long period of time is needed.

Disclosure of Invention

The utility model provides a dendrobium cultivation wall, which aims to solve the problem that in the prior art, the maintenance cost is high due to the fact that nutrients in the wall need to be monitored in real time.

In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a stem of noble dendrobium cultivation wall, is including establishing the curtain body that the cavity is rectangle tubular structure in, open one side of curtain body has the equidistant arc wall that distributes and be parallel to each other, and equal joint in the arc wall has the ascending C shape pole of opening, the tank bottom of arc wall opens there is the water hole that the equidistance distributes, and the surface open of C shape pole has the through-hole that overlaps each other with the water hole, the inner wall of curtain body is located the below position of water hole and is fixed with the ascending water catch bowl draw-in groove of opening, and the inside of water catch bowl peg graft respectively has cotton and wire gauze that absorbs water, the area of cotton and wire gauze is big just like, and the area that absorbs water cotton is greater than the opening size of water hole, one side rotation that the cotton that absorbs water is kept away from to the draw-in groove is connected with the preforming clamp, and the preforming clamp is made for spring steel material, and the one end that the preforming clamp kept away from the draw-in groove is set into crooked form and tightly pastes the surface at the wire gauze to can be when using, when the root position in the C shape pole of the stem of noble dendrobium body is located the water hole is fixed with the water catch bowl draw-in the water hole, can continue to insert cotton and the water inlet tube that has the cotton and wire, the cotton that absorbs water can only to the top that can be continued to the top that the water inlet tube is connected with the water inlet tube that can only has the water inlet tube to the top that the water inlet tube to the water that the water inlet tube is connected to the top that can be continued to the water that the top that can be connected to the top that has the top that and has the top that to the water that can be that to be that the top to be that has the bottom to absorb water that the water that has the water.

As the preferred in this scheme, the degree of depth of arc wall equals the half of curtain wall body thickness, and the equal joint of outer wall of C shape pole has the staple bolt, and the staple bolt passes through the surface of screw fixation at the curtain wall body, the outer wall of one side that the C shape pole is close to the arc wall is opened there are a plurality of mounting holes, and all inlays the non-slip raised who is equipped with the rubber material in the mounting hole.

As the preferred in this scheme, sliding connection has a plurality of woody bottom materials of opening the breach in the spout of C shape pole, and the plastic spraying is done to the interior outer wall of C shape pole to can avoid when the sun shines on quick conduction heat influence stem of noble dendrobium root growth, and also can be used for cultivating some underdeveloped young seedlings of root system.

As the preferred in this scheme, the centre of inlet tube adds and is equipped with the eccentric wheel pump, and the eccentric wheel pump is the cylindrical structure of interior cavity of establishing, and the inside rotation of eccentric wheel pump is connected with the runner, the circumference outer wall of runner is opened there is three rectangle slot that is central symmetry and distributes, and equal sliding connection has the picture peg in the rectangle slot, all be fixed with compression spring between the tail end of picture peg and the tank bottom of rectangle slot, and the width of picture peg and the high looks adaptation of eccentric wheel pump inner chamber, the centre rotation of runner is connected with the transfer line, and the centre of a circle of transfer line is not at one point with the shell centre of a circle of eccentric wheel pump, the outer wall of eccentric wheel pump shell is close to the both sides of runner all open jack, and peg graft respectively in two jacks has communicating pipe and outlet pipe, the one end that the eccentric wheel pump was kept away from to the transfer line is fixed with gear motor, gear motor passes through the bolt fastening on the inner wall of curtain body, thereby can be through gear motor's drive in the time can be to the inlet tube after the water or nutrient solution pressurization to the cotton surface of spouting, thereby reduce the waste of water, make the effect that can more in the root of cotton or dendrobe used.

As the preferred in this scheme, the middle part of wire net and cotton that absorbs water is just to the position of shower nozzle all open there is the aperture to can directly pass cotton root that sprays the dendrobe in C shape pole that absorbs water with a part water when using, dendrobe absorption efficiency has been improved.

As the preferred in this scheme, the outer wall of transfer line has still cup jointed the driving pulley, and the top inner wall of curtain body is fixed with the decurrent channel-section steel crossbeam of opening, and the inside sliding connection of channel-section steel crossbeam has the sliding bar, the lower surface of sliding bar is located the shower nozzle and absorbs water and all is fixed with the hanger plate between the cotton, and the middle part of hanger plate all opens there is the rectangular hole, all be provided with the water diversion grid board in the rectangular hole, divide into two sets of water diversion grid board in the same rectangular hole, the water diversion direction of two sets is opposite, the lower surface of channel-section steel crossbeam is located the top of driving pulley and is fixed with fixed lath, and one side that the fixed lath is close to the shower nozzle is fixed with axle center pole and bearing frame respectively from top to bottom, and the bearing frame internal rotation is connected with the pivot, the driven pulley that forms the transmission with the driving pulley each other is connected, and the outer wall of axle center pole has cup jointed the swinging arms, and the tooth of fan-shaped tooth structure is reserved on the top of swinging arms, and the lower surface welding of sliding bar has the rack with tooth intermeshing to the cotton, so as to can utilize the rotation of transfer bar to drive the water diversion grid board in the two sets to take the water diversion evenly to the place in the cotton when moving the water diversion to the body of the water diversion is sprayed to the side Kong Zhishe to the middle part.

As the preferred in this scheme, the back of curtain body is close to the bottom mounting and has the dowel sleeve pipe, and has pegged graft in the dowel sleeve pipe and have the dowel, can be with the curtain body tightly fixed subaerial through the setting of dowel.

In summary, the beneficial effects in this scheme are:

1. according to the dendrobium cultivation wall, the water absorbing cotton arranged on the back of the water absorbing hole can continuously penetrate through the water absorbing hole to absorb the residual nutrients on the water absorbing cotton when the root of the dendrobium body in the C-shaped rod absorbs the nutrients in the C-shaped rod in use, certain moisture can be stored in the water collecting clamping groove at the bottom of the water absorbing cotton, the development space is enlarged, and the growth due to the narrow space is avoided;

2. according to the dendrobium nobile cultivation wall, the spray heads which are arranged in the curtain wall body and are opposite to the absorbent cotton are used, the absorbent cotton can be supplemented with water only by starting the switch of the water inlet pipe when the dendrobium nobile cultivation wall is used, the absorbent cotton close to the lower portion of the top layer only needs to be sprayed and saturated, and then the absorbent cotton at the bottom can be fully soaked after being continuously sprayed;

3. according to the dendrobium cultivation wall, through the two groups of water distribution grid plates which are arranged to move left and right, water or nutrient solution sprayed from the water inlet pipe can be pressurized by the driving of the gear motor and then sprayed to the surface of the absorbent cotton, so that the waste of the water is reduced, and more water can act on the root of the absorbent cotton or the dendrobium;

4. this kind of dendrobe cultivation wall through belt pulley and the swinging arms that set up, can utilize the rotation of transfer line to drive two sets of constantly switch in the water diversion grid tray when using, and then evenly disperse the cotton surface of absorbing water with shower nozzle spun water, the root of little Kong Zhishe dendrobe body is passed to rivers when waiting to move to intermediate position.

Drawings

FIG. 1 is a schematic cross-sectional view of a dendrobium cultivation wall according to the present utility model;

FIG. 2 is a schematic diagram of an eccentric wheel pump of a dendrobe cultivation wall according to the present utility model;

fig. 3 is a schematic perspective view of a curtain wall body of a dendrobium cultivation wall according to the present utility model;

fig. 4 is a schematic perspective view of a water diversion grid plate of a dendrobium cultivation wall according to the present utility model;

fig. 5 is an enlarged schematic view of the structure of the dendrobium cultivation wall shown in fig. 1 at a position a.

In the figure: 1 curtain wall body, 101 arc tank, 2 outlet pipe, 3 eccentric wheel pump, 4 absorbent cotton, 5 preforming clamp, 6 shower nozzle, 7 water diversion grid board, 8 hanger plate, 9 channel steel crossbeam, 901 fixed slat, 10 sliding bar, 1001 rack, 11 swinging arms, 12 water absorption hole, 13 basic material, 14 staple bolt, 15C shape pole, 1501 non-slip raised, 16 through-holes, 17 driving pulley, 18 gear motor, 19 transfer line, 20 inserted pin, 21 inlet tube, 22 runner, 2201 compression spring, 2202 rectangle slot, 2203 picture peg, 23 driven pulley, 24 axle center pole, 25 conveyer belt.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Example 1

Referring to figures 1-5, a dendrobium cultivation wall comprises a curtain wall body 1 with a rectangular tubular structure and a cavity arranged inside, wherein one side of the curtain wall body 1 is provided with arc grooves 101 which are distributed equidistantly and are parallel to each other, C-shaped rods 15 with upward openings are clamped in the arc grooves 101, water absorbing holes 12 which are distributed equidistantly are formed in the bottoms of the arc grooves 101, through holes 16 which are mutually overlapped with the water absorbing holes 12 are formed in the surfaces of the C-shaped rods 15, a water collecting groove clamping groove with upward openings is fixed at the position, below the water absorbing holes 12, of the inner wall of the curtain wall body 1, water absorbing cotton 4 and a steel wire mesh are respectively inserted into the water collecting clamping groove, the areas of the water absorbing cotton 4 and the steel wire mesh are the same, the area of the water absorbing cotton 4 is larger than the opening size of the water absorbing holes 12, one side of the water collecting clamping groove far away from the water absorbing cotton 4 is rotationally connected with a pressing clip 5, the tabletting clamp 5 is made of spring steel materials, one end of the tabletting clamp 5 far away from the water collecting clamping groove is arranged into a bent shape and tightly attached to the surface of the steel wire mesh, so that when the root of the dendrobium body in the C-shaped rod 15 absorbs nutrients in the C-shaped rod 15, the dendrobium body can continuously pass through the water absorbing holes 12 to absorb the residual nutrients on the water absorbing cotton 4, certain moisture can be stored in the water collecting clamping groove at the bottom of the water absorbing cotton 4, the water inlet pipe 21 is fixed in the inner part of the curtain wall body 1 near the back, the water inlet pipe 21 is connected with a plurality of vertical pipes which are parallel to each other through pipe connectors, the top ends of the vertical pipes are all provided with spray heads 6, the spray hole positions in the spray heads 6 are opposite to the water absorbing cotton 4, and therefore, when the dendrobium body is used, the water absorbing cotton 4 can be supplemented only by opening a switch of the water inlet pipe 21, the water absorbing cotton 4 near the top end can be sprayed and saturated, and then spraying is continued to fully soak the absorbent cotton at the bottom.

In the utility model, the depth of the arc-shaped groove 101 is equal to half of the thickness of the curtain wall body 1, the outer walls of the C-shaped rods 15 are respectively clamped with the anchor ear 14, the anchor ear is fixed on the surface of the curtain wall body 1 through screws, a plurality of mounting holes are formed in the outer wall of one side of the C-shaped rods 15, which is close to the arc-shaped groove 101, and the mounting holes are embedded with the anti-skid protrusions 1501 made of rubber materials.

The sliding connection has a plurality of tree bottom materials 13 that open the breach in the spout of C shape pole 15, and the plastic spraying is done to the inside and outside wall of C shape pole 15 to can avoid when the sun shines on quick conduction heat to influence the growth of stem of noble dendrobium root, and also can be used for cultivating some underdeveloped young seedlings.

Wherein, the centre of inlet tube 21 add and be equipped with eccentric wheel pump 3, and eccentric wheel pump 3 is the cylindrical structure of establishing the cavity in, and the inside rotation of eccentric wheel pump 3 is connected with runner 22, the circumference outer wall of runner 22 open and have three rectangular slot 2202 that are central symmetry and distribute, and all sliding connection has picture peg 2203 in the rectangular slot 2202, all be fixed with compression spring 2201 between the tail end of picture peg 2203 and the tank bottom of rectangular slot 2202, and the width of picture peg 2203 and the high looks adaptation of eccentric wheel pump 3 inner chamber, the centre rotation of runner 22 is connected with transfer line 19, and the centre of a circle of transfer line 19 and the shell centre of a circle of eccentric wheel pump 3 all open the jack in the both sides that are close to runner 22 of eccentric wheel pump 3, and peg graft respectively in two jacks have communicating pipe and outlet pipe 2, the one end that eccentric wheel pump 3 was kept away from to transfer line 19 is fixed with gear motor 18, gear motor 18 passes through the bolt fastening on the inner wall of curtain body 1, thereby can be to the water or the water that absorbs water in the water of cotton root 4 after the pressurized in the inlet tube 21 is pressed through gear motor's drive when using can be more in the waste of water that the water of more than 4 of the water-absorbing of the root of the water of the cotton.

Further, the middle parts of the steel wire mesh and the absorbent cotton 4 are provided with small holes at positions opposite to the spray head 6, so that part of water can be directly sprayed on the root of the dendrobium in the C-shaped rod 15 by penetrating through the absorbent cotton 4 when the dendrobium nobile absorber is used, and the dendrobium nobile absorption efficiency is improved.

Further, the outer wall of transfer line 19 still cup jointed driving pulley 17, and the top inner wall of curtain body 1 is fixed with the decurrent channel-section steel crossbeam 9 of opening, and the inside sliding connection of channel-section steel crossbeam 9 has slide bar 10, the lower surface of slide bar 10 be located and all be fixed with hanger plate 8 between shower nozzle 6 and the cotton 4 that absorbs water, and the middle part of hanger plate 8 all opens the rectangular hole, the rectangular hole in all be provided with water diversion grid plate 7, divide into two sets of water diversion grid plate 7 in the same rectangular hole, the water diversion direction of two sets is opposite, the lower surface of channel-section steel crossbeam 9 is located driving pulley 17's top and is fixed with fixed lath 901, and one side that fixed lath 901 is close to shower nozzle 6 is fixed with axle core rod 24 and bearing frame from top to bottom respectively, and the bearing frame internal rotation is connected with the pivot, the outer wall of pivot cup joints the driven pulley 23 that forms the transmission connection with driving pulley 17 each other, and the outer wall of axle core rod 24 cup joints swinging rod 11, and the top of swinging rod 11 has reserved fan-shaped structure's tooth teeth, and the lower surface of slide bar 10 has tooth 1001 and tooth root and tooth 1001 to be divided into two sets, so that can not take turns to the water diversion line 62 to the middle part of the water diversion line that can be sprayed out to the evenly when the cotton 4 is moved to the middle part of the water diversion line 62 is changed to the driving bar 6 to the bit-shaped when the water diversion line is used to the bit-down to the bit line of the face of the shower nozzle 62 to the face that can be even to the bit down.

Further, the back of curtain body 1 be close to the bottom fixed and have the dowel sleeve pipe, and peg graft in the dowel sleeve pipe and have peg 20, can tightly fix the curtain body subaerial through peg 20's setting.

Working principle: when the novel dendrobium nobile curtain wall is used, firstly, the curtain wall body 1 is orderly fixed at a place suitable for growth of a dendrobium nobile body through the inserting nails 20, then, the split tree bed charge is penetrated into the C-shaped rod 15, the split direction is consistent with the opening direction of the C-shaped rod 15, then, the C-shaped rod 15 is fixed in an arc-shaped groove 101 on the front surface of the curtain wall body 1 through the anchor ear 14, the through hole 16 in the C-shaped rod 15 is overlapped with the water absorption hole 12, then, the water absorption cotton 4 and the steel wire gauze are inserted into a water collection clamping groove on the inner wall of the curtain wall body 1 together, and then, the dendrobium nobile body in the split is sprayed with liquid from the outside to water; after the root breaks through the breach, the root can pass through the through-hole 16 and the water absorption hole 12 and directly contact the absorbent cotton, at this moment only the valve of gear motor and inlet tube 21 needs to be started regularly, at this moment, the rotation of utilizing transfer line 19 drives two sets of continuous switches in the water diversion grid plate 7, and then evenly disperses the water of shower nozzle 6 blowout to the surface of absorbent cotton 4, and the rivers pass the root of little Kong Zhishe stem of noble dendrobium body when waiting to move to intermediate position.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a dendrobium cultivation wall, includes establishes cavity in and is curtain body (1) of rectangle tubular structure, open one side of curtain body (1) has equidistant arc groove (101) that distribute and parallel each other, and all joint has ascending C shape pole (15) of opening in arc groove (101), open the tank bottom of arc groove (101) has equidistant water absorption hole (12) that distribute, and the surface open of C shape pole (15) has through-hole (16) that overlap each other with water absorption hole (12), characterized in that, the inner wall of curtain body (1) is located the below position of water absorption hole (12) and is fixed with the ascending water collecting clamping groove of opening, and water collecting clamping groove's inside peg graft respectively has water absorption cotton (4) and wire net, water absorption cotton (4) and wire net's area is the same big, and water absorption cotton (4) area is greater than the opening size of water absorption hole (12), water collecting clamping groove keeps away from one side rotation of water absorption cotton (4) and is connected with preforming clamp (5), and steel clamp (5) are spring clamp (6) are the water inlet tube (6) that are that the water inlet tube (6) are close to each other, water inlet tube (6) are connected to one end that is close to each other in the water inlet tube (6) that the water inlet tube is connected to take shape, the water inlet tube (21) is connected to the water inlet tube that is close to each other, the water inlet tube is connected to the top (21), when the root of the dendrobium body in the C-shaped rod (15) absorbs nutrients in the C-shaped rod (15), the dendrobium body continuously passes through the water absorption holes (12) to absorb the nutrients remained on the water absorption cotton (4), and certain moisture can be stored in the water collection clamping groove at the bottom of the water absorption cotton (4);

the middle of the water inlet pipe (21) is additionally provided with the eccentric wheel pump (3), the eccentric wheel pump (3) is of a cylindrical structure with a cavity arranged inside, the inside of the eccentric wheel pump (3) is rotationally connected with the rotating wheel (22), three rectangular slots (2202) which are distributed in a central symmetry mode are formed in the outer wall of the circumference of the rotating wheel (22), inserting plates (2203) are connected in the rectangular slots (2202) in a sliding mode, compression springs (2201) are fixed between the tail ends of the inserting plates (2203) and the bottoms of the rectangular slots (2202), the width of the inserting plates (2203) is matched with the height of the inner cavity of the eccentric wheel pump (3), the middle of the rotating wheel (22) is rotationally connected with a transmission rod (19), the center of the transmission rod (19) is not at one point with the center of the outer shell of the eccentric wheel pump (3), inserting holes are formed in the two sides of the outer wall of the outer shell of the eccentric wheel pump (3), a speed reducing motor (18) are fixed at one end of the transmission rod (19) far away from the eccentric wheel pump (3), the root of the speed reducing motor (18) is fixed with the connecting pipe (2) respectively, the cotton spray head (4) can directly face the water sucking holes (4) in the middle part (6) through the water sucking wire (4), the outer wall of the transmission rod (19) is also sleeved with a driving belt pulley (17), the inner wall of the top of the curtain wall body (1) is fixedly provided with a channel steel beam (9) with a downward opening, the inside of the channel steel beam (9) is slidably connected with a sliding bar (10), the lower surface of the sliding bar (10) is positioned between the spray head (6) and the absorbent cotton (4), lifting plates (8) are fixedly arranged, rectangular holes are formed in the middle of the lifting plates (8), water distribution grid plates (7) are arranged in the rectangular holes, the water distribution grid plates (7) in the same rectangular holes are divided into two groups, the water distribution directions of the two groups are opposite, the lower surface of the channel steel beam (9) is positioned above the driving belt pulley (17) and is fixedly provided with a fixed lath (901), one side of the fixed lath (901) close to the spray head (6) is fixedly provided with a spindle core rod (24) and a bearing seat from top to bottom, the outer wall of the bearing seat is internally connected with a rotating shaft, the outer wall of the rotating shaft is sleeved with a driven belt pulley (23) which is mutually connected with the driving belt pulley (17), the outer wall of the spindle rod (24) is provided with a water distribution grid plate (7), the water distribution grid plates (7) are divided into two groups, the water distribution grid plates (11) are meshed with the water distribution tooth teeth (1001) are meshed with the water distribution grid plates (11) in the water distribution bar (11) when the two groups are welded with the water distribution grid plates (19), and then evenly disperse the water sprayed out by the spray head (6) to the surface of the absorbent cotton (4), and the water flow passes through the root of the small Kong Zhishe dendrobium body when the water is to be moved to the middle position.

2. The dendrobium cultivation wall according to claim 1, wherein the depth of the arc-shaped groove (101) is equal to half of the thickness of the curtain wall body (1), hoops (14) are clamped on the outer walls of the C-shaped rods (15), the hoops are fixed on the surface of the curtain wall body (1) through screws, a plurality of mounting holes are formed in the outer walls of one sides, close to the arc-shaped groove (101), of the C-shaped rods (15), and anti-skidding protrusions (1501) made of rubber materials are embedded in the mounting holes.

3. The dendrobium cultivation wall according to claim 1, wherein a plurality of split tree base materials (13) are connected in the sliding groove of the C-shaped rod (15) in a sliding mode, and the inner wall and the outer wall of the C-shaped rod (15) are subjected to plastic spraying treatment.

4. The dendrobium cultivation wall according to claim 1, wherein the back of the curtain wall body (1) is close to the bottom end, a plug pin sleeve is fixed to the back of the curtain wall body, plug pins (20) are inserted into the plug pin sleeve, and the curtain wall body can be tightly fixed to the ground through the plug pins (20).