CN209619496U - A kind of plating automatic medicine adding apparatus - Google Patents

Abstract

The utility model discloses a kind of plating automatic medicine adding apparatus, including electroplating bath, the electroplating bath two sides are equipped with bracket, cantilever tip described in two sides is fixed with the guide rail parallel with electroplating bath, two groups of idler wheels are respectively equipped on guide rail described in two sides, wheel shaft is fixedly connected between idler wheel described in every group, the axle sleeve with wheel shaft rotation connection is cased on the right side of two wheel shafts, it is connected between the axle sleeve by connecting rod, the slide bar vertical with connecting rod is welded in the middle part of the connecting rod, it is rotatablely connected with first motor frame by axle sleeve in the middle part of two wheel shafts, lifting motor is fixed on the first motor frame, the output shaft of the lifting motor is rotatablely connected in the middle part of first motor frame and with first motor frame, the output shaft bottom end of the lifting motor and screw rod weld, it is rotatablely connected on the left of the wheel shaft by axle sleeve and the second motor rack, make Every batch of plating piece can be electroplated under identical plating environment, to promote electroplating effect, more save the energy.

Description

A kind of plating automatic medicine adding apparatus

Technical field

The utility model belongs to electroplating technology, and in particular to a kind of plating automatic medicine adding apparatus.

Background technique

Plating is exactly to plate the process of the other metal or alloy of a thin layer on certain metal surfaces using electrolysis principle, is The technique of the surface of metal or other materials product attachment layer of metal film is set to prevent metal oxygen to play using electrolysis The effects of changing (as corroded), improving wearability, electric conductivity, reflective, corrosion resistance (copper sulphate etc.) and having improved aesthetic appearance.Plating When, need quantitatively to add microelement medical fluid in the plating solution into aqueduct, existing addition manner generally using artificial addition, is easy Appearance is added or is added less, and is not added or repeats situations such as adding, and any of the above-described situation can all influence product quality so that plating Product unstability due to human factors greatly increases, and will lead to rejection rate raising when serious, brings to enterprise additional Financial burden.

Method timing dosing into electroplating bath of electrical control is used in the prior art, but since every batch of original part is being electroplated The ingredient of electroplate liquid is caused to change afterwards, the distance between plated item suspension arrangement difference leads to the medicine liquid ingredient in electroplating bath Not timing consumption, it is difficult to guarantee that every batch of original part is under equal conditions electroplated, making plating, original part plating conditions are different causes to plate Part quality is different, it is difficult to plating piece be electroplated under best plating environment.

Utility model content

The purpose of this utility model is to provide a kind of plating automatic medicine adding apparatus, to solve to propose in above-mentioned background technique The problem of.

To achieve the above object, the utility model provides the following technical solutions: a kind of plating automatic medicine adding apparatus, including electricity Coating bath, the electroplating bath two sides are equipped with bracket, and cantilever tip described in two sides is fixed with the guide rail parallel with electroplating bath, two sides institute It states and is respectively equipped with two groups of idler wheels on guide rail, wheel shaft is fixedly connected between idler wheel described in every group, is covered on the right side of two wheel shafts There is the axle sleeve with wheel shaft rotation connection, connected between the axle sleeve by connecting rod, the connecting rod middle part is welded with and connecting rod Vertical slide bar, two wheel shafts middle parts are rotatablely connected with first motor frame by axle sleeve, fixed on the first motor frame There is lifting motor, the output shaft of the lifting motor is rotatablely connected in the middle part of first motor frame and with first motor frame, described The output shaft bottom end of lifting motor and screw rod weld, and are rotatablely connected on the left of the wheel shaft by axle sleeve and the second motor rack, described It is fixed with driving motor on second motor rack, driving gear, the driving gear are fixed on the output shaft of the driving motor It is engaged with driven gear fixed on one of wheel shaft, second motor rack bottom is fixed with perpendicular slide bar, institute It states slide bar bottom to be threadedly coupled equipped with block plate, the screw rod and lifting frame middle part, the lifting frame both ends are respectively and in connecting rod Slide bar, the second motor rack bottom sliding bar connection, the bracket in the middle part of the electroplating bath is equipped with race, the race two The shaft of side and dosing gear two sides is rotatablely connected, and is fixedly connected by shaft with first bevel gear on the right side of the dosing gear, The first bevel gear is engaged with second bevel gear, and the second bevel gear bottom is fixedly connected with tooth shaft, the tooth shaft top It is rotatablely connected with the fixed pedestal of side face, the tooth shaft lower part is located inside thread barrel and slides with thread barrel inner wall and connects It connecing, fixed threaded frame is threadedly coupled on the outside of the thread barrel and on bracket, and the thread barrel bottom end is fixedly connected with piston rod, The piston rod bottom end is fixedly connected with the piston in fluid cylinder, and fluid cylinder bottom is equipped with medicine feeding hole, is equipped with disk inside the medicine feeding hole Cylinder, the disk cylinder is interior to pass through compressed spring and the first chuck elastic connection, and the disk cylinder upper side is equipped with through-hole, described into medicine It being connect by drug-feeding tube with medicine storing drum on the outside of hole, the fluid cylinder side is equipped with medicine outlet hole, it is equipped with spring(-supported) mount inside the medicine outlet hole, The spring(-supported) mount is located at outside medicine outlet hole by the second chuck elastic connection on the outside of extension spring and medicine outlet hole, second chuck In the disk cylinder of side, the disk cylinder other end on the outside of the medicine outlet hole is connected to drug discharging tube, and the drug discharging tube other end is located at electroplating bath It is interior.

Preferably, be rotatablely connected on the inside of the axle sleeve with wheel shaft, on the outside of the axle sleeve respectively with connecting rod, first motor Frame, the second motor rack are fixedly connected, and the idler wheel has there are two two groups and every group of idler wheels, the idler wheel respectively with guide rail on the upside of, Inside fitting.

Preferably, there are two the slide bars, the block plate is that cylindrical and the end face of block plate and the axis of slide bar are vertical, institute State screw rod, the axis of slide bar is in the same plane.

Preferably, the lifting frame is cuboid and parallel with wheel shaft, the end cross-sectional of the lifting frame be tooth form and It is concordant with dosing gear.

Preferably, the first bevel gear is parallel with dosing gear, and the second bevel gear is vertical with first bevel gear.

Preferably, the tooth shaft is the toothed cylindrical shaft in side, and is bonded on the inside of tooth shaft bottom sides and thread barrel, institute It states and is spirally connected in the middle part of screw thread and threaded frame on the outside of thread barrel, the pedestal, threaded frame side are both secured to side face and the two It is parallel between branch.

Preferably, the disk cylinder internal diameter on the inside of the medicine feeding hole is equal to the diameter of the first chuck, the diameter of first chuck Greater than the diameter of medicine outlet hole, disk cylinder diameter on the outside of the medicine outlet hole is greater than the diameter of the second chuck, second chuck it is straight Diameter is greater than the diameter of medicine outlet hole.

Preferably, the spring(-supported) mount shape connect for cylinder is vertical with disk, and the extension spring is in stretching shape always State, the compressed spring are in compressive state always, and the extension spring, compressed spring are made of resistant material.

The technical effect and advantage of the utility model: the utility model using the movement of driving make driving on lifting frame with The engagement of dosing gear, when driving is moved to predetermined position, lifting frame is engaged with dosing gear, and lifting frame decline later makes dosing Gear rotation, the piston motion in fluid cylinder, enters the medical fluid in medicine storing drum in fluid cylinder at this time, is being electroplated Rising at rear lifting frame makes piston reverses direction movement the medical fluid in electroplating bath will be made in every batch of in the medical fluid injection electroplating bath in fluid cylinder It can be supplemented after the completion of original part plating, only timing be needed to access medical fluid into medicine storing drum, be made by suitable supplement every Criticizing plating piece can be electroplated under identical plating environment, so that electroplating effect is promoted, it is real-time compared to using electric device Monitoring, the utility model more save the energy without consuming additional electricity.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the structural schematic diagram of the traveled portion of the utility model；

Fig. 3 is the structural schematic diagram of the dosing running part of the utility model；

Fig. 4 is the tooth shaft, thread barrel connection structure diagram of the utility model；

Fig. 5 is the fluid cylinder cross-sectional view of the utility model；

Fig. 6 is the fluid cylinder right view of the utility model.

In figure: 1, electroplating bath；2, bracket；3, idler wheel；4, wheel shaft；5, lifting motor；6, guide rail；7, slide bar；8, screw rod；9, Dosing gear；10, gear grooved；11, pedestal；12, threaded frame；13, fluid cylinder；14, medicine storing drum；15, drug-feeding tube；16, drug discharging tube； 17, lifting frame；18, axle sleeve；19, connecting rod；20, first motor frame；21, driving motor；22, driving gear；23, driven tooth Wheel；24, block plate；25, shaft；26, first bevel gear；27, second bevel gear；28, the second motor rack；29, thread barrel；30, lead to Hole；31, piston rod；32, disk cylinder；33, tooth shaft；34, piston；35, spring(-supported) mount；36, the second chuck；37, extension spring；38, it presses Contracting spring；39, medicine feeding hole；40, medicine outlet hole；41, the first chuck.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

The utility model provides a kind of plating automatic medicine adding apparatus as shown in figures 1 to 6, including electroplating bath 1, the electricity 1 two sides of coating bath are equipped with bracket 2, and 2 top of bracket described in two sides is fixed with the guide rail 6 parallel with electroplating bath 1, guide rail described in two sides It is respectively equipped with two groups of idler wheels 3 on 6, wheel shaft 4 is fixedly connected between idler wheel 3 described in every group, two 4 right sides of wheel shaft are cased with The axle sleeve 18 being rotatablely connected with wheel shaft 4 is connected by connecting rod 19 between the axle sleeve 18, be welded in the middle part of the connecting rod 19 with The vertical slide bar 7 of connecting rod 19, two 4 middle parts of the wheel shafts pass through axle sleeve 18 with first motor frame 20 and are rotatablely connected, and described the It is fixed with lifting motor 5 on one motor rack 20, the output shaft of the lifting motor 5 is through 20 middle part of first motor frame and with first Motor rack 20 is rotatablely connected, and the output shaft bottom end of the lifting motor 5 and screw rod 8 weld, and passes through axle sleeve 18 on the left of the wheel shaft 4 Be rotatablely connected with the second motor rack 28, be fixed with driving motor 21 on second motor rack 28, the driving motor 21 it is defeated Driving gear 22 is fixed on shaft, the driving gear 22 is engaged with driven gear 23 fixed on one of wheel shaft 4, institute It states 28 bottom of the second motor rack and is fixed with perpendicular slide bar 7,7 bottom of slide bar is equipped with block plate 24, the screw rod 8 and act Rise and be threadedly coupled in the middle part of frame 17,17 both ends of lifting frame respectively with the slide bar 7 in connecting rod 19,28 bottom of the second motor rack Slide bar 7 is slidably connected, and the bracket 2 at 1 middle part of electroplating bath is equipped with race, the race two sides and 9 two sides of dosing gear Shaft 25 is rotatablely connected, and is fixedly connected by shaft 25 with first bevel gear 26 on the right side of the dosing gear 9, the first cone tooth Wheel 26 is engaged with second bevel gear 27, and 27 bottom of second bevel gear is fixedly connected with tooth shaft 33,33 top of tooth shaft and The fixed pedestal 11 in 2 side of bracket is rotatablely connected, 33 lower part of tooth shaft be located inside thread barrel 29 and with 29 inner wall of thread barrel It is slidably connected, 29 outside of thread barrel is threadedly coupled with threaded frame 12 fixed on bracket 2,29 bottom end of thread barrel and work Stopper rod 31 is fixedly connected, and 31 bottom end of piston rod is fixedly connected with the piston 34 in fluid cylinder 13, and 13 bottom of fluid cylinder is equipped with into medicine Hole 39 is equipped with disk cylinder 32 inside the medicine feeding hole 39, is connected in the disk cylinder 32 by compressed spring 38 and 41 elasticity of the first chuck It connects, 32 upper side of disk cylinder is equipped with through-hole 30, is connect by drug-feeding tube 15 with medicine storing drum 14 on the outside of the medicine feeding hole 39, institute It states 13 side of fluid cylinder and is equipped with medicine outlet hole 40, spring(-supported) mount 35 is equipped with inside the medicine outlet hole 40, the spring(-supported) mount 35 is by stretching bullet Second chuck, 36 elastic connection in 40 outside of spring 37 and medicine outlet hole, second chuck 36 are located at the disk cylinder 32 in 40 outside of medicine outlet hole In, 32 other end of disk cylinder in 40 outside of medicine outlet hole is connected to drug discharging tube 16, and 16 other end of drug discharging tube is located at electroplating bath 1 It is interior.

Specifically, 18 inside of the axle sleeve is rotatablely connected with wheel shaft 4,18 outside of axle sleeve respectively with connecting rod 19, the One motor rack 20, the second motor rack 28 are fixedly connected, and the idler wheel 3 has there are two two groups and every group of idler wheels 3, and the idler wheel 3 divides It is not bonded with 6 upside of guide rail, inside, axle sleeve 18 enables two wheel shafts 4 to be connected with each other with the cooperation of connecting rod 19 to turn simultaneously Dynamic, two groups of idler wheels 3 rotate stability with higher, can prevent lifting frame 17 from shaking.

Specifically, the block plate 24 is the axis of cylindrical and block plate 24 end face and slide bar 7 there are two the slide bars 7 Vertically, the screw rod 8, slide bar 7 axis be in the same plane, block plate 24 for prevent lifting frame 17 and screw rod 8 skidding lead Lifting frame 17 is caused to fall in electroplating bath 1 and cause accident, it is safer.

Specifically, the lifting frame 17 is cuboid and parallel with wheel shaft 4, the end cross-sectional of the lifting frame 17 is tooth Shape and concordant with dosing gear 9, is connect using lifting frame 17 with dosing gear 9, after driving marches to predetermined position, lifting frame 17 ends are engaged with dosing gear 9, so as to make the rotation of dosing gear 9 to drive chemicals dosing plant operation to realize dosing.

Specifically, the first bevel gear 26 is parallel with dosing gear 9, the second bevel gear 27 and first bevel gear 26 Vertically, first the direction of transfer that bevel gear changes the power of dosing gear 9 with the cooperation of second bevel gear 27 is chased after, to realize mutually vertical It is driven between straight shaft 25 and tooth shaft 33.

Specifically, the tooth shaft 33 is the toothed cylindrical shaft in side, and on the inside of 33 bottom sides of tooth shaft and thread barrel 29 It is bonded, is spirally connected in the middle part of the screw thread and threaded frame 12 in 29 outside of thread barrel, the pedestal 11,12 side of threaded frame are both secured to Parallel between 2 side of bracket and the two branch, tooth shaft 33 makes for connection screw thread cylinder 29 and second bevel gear 27, the tooth of 33 side of tooth shaft Thread barrel 29 rotates simultaneously, tooth shaft 33 it is axial it is parallel with thread barrel 29 enable thread barrel 29 the axis of tooth shaft 33 move up from And keep piston rod 31 mobile.

Specifically, 32 internal diameter of disk cylinder of 39 inside of medicine feeding hole is equal to the diameter of the first chuck 41, first chuck 41 diameter is greater than the diameter of medicine outlet hole 40, and 32 diameter of disk cylinder in 40 outside of medicine outlet hole is greater than the diameter of the second chuck 36, The diameter of second chuck 36 is greater than the diameter of medicine outlet hole 40, and medicine feeding hole 39 is connect with drug-feeding tube 15, in 13 inner piston of fluid cylinder Under 34 movements, the medical fluid in medicine-storing tube can be sucked fluid cylinder 13, later the drug by connecting on 40 outside disc cylinder 32 of medicine outlet hole Medical fluid is added in electroplating bath 1 pipe 16.

It is connect specifically, 35 shape of spring(-supported) mount is that cylinder is vertical with disk, the extension spring 37 is always in drawing State is stretched, the compressed spring 38 is in compressive state always, and the extension spring 37, compressed spring 38 are by resistant material It is made, spring(-supported) mount 35 connect with second chuck 36 in 40 outside of medicine outlet hole, compresses for fixing extension spring 37, extension spring 37 Spring 38 is connect with the first chuck 41 of 39 inside of medicine feeding hole be pressed into the movement of piston 34 can in electroplating bath 1 medical fluid.

Working principle: when the utility model is used, original part to be plated is suspended on lifting frame 17, driving motor 21 later Operating makes driving gear 22 that the wheel shaft 4 being fixedly connected on driven gear 23 be driven to rotate, thus roll idler wheel 3 on guide rail 6, When lifting frame 17 moves to predetermined position, lifting motor 5 is operated, and the rotation of screw rod 8 at this time drives the lifting frame being spirally connected with screw rod 8 17 move down, and 17 end of lifting frame is engaged with dosing gear 9 makes shaft 25 that first bevel gear 26 be driven to rotate.With the first cone tooth The rotation of second bevel gear 27 of 26 engagement of wheel makes the rotation of tooth shaft 33 that thread barrel 29 be driven to rotate in threaded frame 12, at this time piston rod 31 move up, and 33 position of tooth shaft is constant, and thread barrel 29 is moved up with respect to tooth shaft 33 reduces 13 air pressure inside of fluid cylinder, this When, the first chuck 41 in the disk cylinder 32 of the inside of medicine feeding hole 39 under differential pressure action compresses further compressed spring 38, drug storage Medical fluid in bucket 14 passes sequentially through drug-feeding tube 15, medicine feeding hole 39, the disk cylinder 32 in the outside of the first chuck 41, the through-hole 30 on disk cylinder 32 Into in fluid cylinder 13, after the completion of the plating of a collection of original part, 5 backwards rotation of lifting motor rises lifting frame 17, on lifting frame 17 When rising to the plating piece of upper part suspension and rising in electroplating bath 1 above electroplate liquid, lifting frame 17 is engaged with dosing gear 9 makes dosing tooth Wheel 9 rotates backward, so that piston rod 31 be made to move downward, the medical fluid in fluid cylinder 13 is made successively to pass through medicine outlet hole 40, disk cylinder 32, go out Pencil 16 enters electroplating bath 1, supplements in time the ingredient in electroplating bath 1, makes every batch of plating original part can be more stable It is electroplated under environment, while promoting plating quality, avoids and detected using electrical equipment, save the energy.

Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention, it is not limited to this Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art For, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic It is equivalently replaced, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on, It should be included within the scope of protection of this utility model.

Claims (8)

1. a kind of plating automatic medicine adding apparatus, including electroplating bath (1), it is characterised in that: electroplating bath (1) two sides are equipped with branch Frame (2), bracket (2) top described in two sides are fixed with the guide rail parallel with electroplating bath (1) (6), on guide rail (6) described in two sides respectively It equipped with two groups of idler wheels (3), is fixedly connected with wheel shaft (4) between idler wheel described in every group (3), is covered on the right side of two wheel shafts (4) There is the axle sleeve (18) with wheel shaft (4) rotation connection, is connected between the axle sleeve (18) by connecting rod (19), the connecting rod (19) Middle part is welded with the slide bar vertical with connecting rod (19) (7), passes through axis with first motor frame (20) in the middle part of two wheel shafts (4) (18) rotation connection is covered, is fixed with lifting motor (5) on the first motor frame (20), the output shaft of the lifting motor (5) It is rotatablely connected in the middle part of first motor frame (20) and with first motor frame (20), the output shaft bottom end of the lifting motor (5) It welds with screw rod (8), is rotatablely connected on the left of the wheel shaft (4) by axle sleeve (18) and the second motor rack (28), second electricity It is fixed in rack (28) driving motor (21), is fixed with driving gear (22), institute on the output shaft of the driving motor (21) It states driving gear (22) to engage with driven gear (23) fixed on one of wheel shaft (4), the second motor rack (28) bottom Portion is fixed with perpendicular slide bar (7), and slide bar (7) bottom is equipped with block plate (24), the screw rod (8) and lifting frame (17) Middle part be threadedly coupled, lifting frame (17) both ends respectively with the slide bar (7) on connecting rod (19), the second motor rack (28) bottom Slide bar (7) be slidably connected, the bracket (2) in the middle part of the electroplating bath (1) is equipped with race, the race two sides and dosing gear (9) shaft (25) rotation connection of two sides, dosing gear (9) right side are fixed by shaft (25) and first bevel gear (26) Connection, the first bevel gear (26) are engaged with second bevel gear (27), second bevel gear (27) bottom and tooth shaft (33) It is fixedly connected, the pedestal (11) that tooth shaft (33) top and bracket (2) side are fixed is rotatablely connected, tooth shaft (33) lower part It is slidably connected positioned at thread barrel (29) inside and with thread barrel (29) inner wall, it is solid on thread barrel (29) outside and bracket (2) Fixed threaded frame (12) is threadedly coupled, and thread barrel (29) bottom end is fixedly connected with piston rod (31), the piston rod (31) Bottom end is fixedly connected with the piston (34) in fluid cylinder (13), and fluid cylinder (13) bottom is equipped with medicine feeding hole (39), the medicine feeding hole (39) Inside is equipped with disk cylinder (32), passes through compressed spring (38) and the first chuck (41) elastic connection, the disk in the disk cylinder (32) Cylinder (32) upper side is equipped with through-hole (30), is connect by drug-feeding tube (15) with medicine storing drum (14) on the outside of the medicine feeding hole (39), Fluid cylinder (13) side is equipped with medicine outlet hole (40), is equipped with spring(-supported) mount (35) inside the medicine outlet hole (40), the spring(-supported) mount (35) pass through the second chuck (36) elastic connection on the outside of extension spring (37) and medicine outlet hole (40), the second chuck (36) position In disk cylinder (32) on the outside of medicine outlet hole (40), disk cylinder (32) other end and drug discharging tube (16) on the outside of the medicine outlet hole (40) are even Logical, drug discharging tube (16) other end is located in electroplating bath (1).

2. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: axle sleeve (18) inside and wheel shaft (4) it is rotatablely connected, it is solid with connecting rod (19), first motor frame (20), the second motor rack (28) respectively on the outside of the axle sleeve (18) Fixed connection, the idler wheel (3) have there are two two groups and every group of idler wheels (3), the idler wheel (3) respectively on the upside of guide rail (6), inside Fitting.

3. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: there are two the slide bars (7), the gear Disk (24) is that cylindrical and block plate (24) end face is vertical with the axis of slide bar (7), the screw rod (8), slide bar (7) axis position In in same plane.

4. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: the lifting frame (17) is cuboid And it is parallel with wheel shaft (4), the end cross-sectional of the lifting frame (17) is tooth form and concordant with dosing gear (9).

5. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: the first bevel gear (26) and dosing In parallel, the second bevel gear (27) is vertical with first bevel gear (26) for gear (9).

6. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: the tooth shaft (33) is that side is toothed Cylindrical shaft, and be bonded on the inside of tooth shaft (33) bottom sides and thread barrel (29), the screw thread and spiral shell on the outside of the thread barrel (29) It is spirally connected in the middle part of line frame (12), the pedestal (11), threaded frame (12) side are both secured to put down between bracket (2) side and the two branch Row.

7. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: the disk cylinder on the inside of the medicine feeding hole (39) (32) internal diameter is equal to the diameter of the first chuck (41), and the diameter of first chuck (41) is greater than the diameter of medicine outlet hole (40), institute The diameter that disk cylinder (32) diameter on the outside of medicine outlet hole (40) is greater than the second chuck (36) is stated, the diameter of second chuck (36) is big Diameter in medicine outlet hole (40).

8. plating automatic medicine adding apparatus according to claim 1, it is characterised in that: spring(-supported) mount (35) shape is cylinder Vertical with disk to connect, the extension spring (37) is in tensional state always, and the compressed spring (38) is always in compression State, the extension spring (37), compressed spring (38) are made of resistant material.