CN206978612U - A kind of processing unit (plant) of freezing shrimp meat - Google Patents

Abstract

The utility model provides a kind of processing unit (plant) of freezing shrimp meat, including housing, antistaling box and household freezer in housing, antistaling box and household freezer are separated provided with dividing plate in housing, the housing top surface of dividing plate both sides is provided with charging aperture, housing side is provided with symmetrical discharging opening, housing bottom is provided with heat sink and universal wheel, housing side is additionally provided with control panel and display screen, device of the present utility model carries out freezing processing again after carrying out Preservation Treatment to peeled shrimp, whole operation process only need to manually pour into peeled shrimp, remaining process processes peeled shrimp by control panel control device, greatly save manpower, the peeled shrimp freezing of processing is uniform, chilling rate is fast, obtained freezing shrimp meat is in good taste, surface is not easy particle-bound bacteria.

Description

A kind of processing unit (plant) of freezing shrimp meat

Technical field

The utility model belongs to aquatic products processing technical field, and in particular to a kind of processing unit (plant) of freezing shrimp meat.

Background technology

Shrimp it is nutritious, containing protein be fish, egg, several times to tens times of milk；Also containing abundant potassium, iodine, magnesium, phosphorus Deng the composition such as mineral matter and vitamin A, aminophylline, and its meat is soft, easy to digest, in poor health and need to raise after being ill People be fabulous food；There is important adjustment effect to cardiomotility, can protect well containing abundant magnesium, magnesium in shrimp Cardiovascular system, it can reduce blood cholesterol level, prevent artery sclerosis, at the same can also coronary artery dilator, be advantageous to Preventing hypertension and myocardial infarction；The lactation promoting effect of shrimp is stronger, and is rich in phosphorus, calcium, has help effect especially to children, pregnant woman, But shrimp preserves easy blacking, prawn is needed to carry out Preservation Treatment, it is usually fresh-keeping using the progress of freezing processing prawn, but freezing processing Shrimp be not very fresh, mouthfeel is also varied from, also exist shrimp freezing it is uneven, the problems such as bacterium be present.

Such as, Chinese utility model granted patent document, the U of Authorization Notice No. CN 205757002, the practicality is newly for prior art Type discloses a kind of quick-freezing fresh-keeping Penaeus Vannmei process unit, including groove lid, electric cabinet, household freezer, motor, shell, fixation Button, display screen, guidance panel, chute, switch, shrimp-entering mouth, antistaling box, oxygen pump, button, go out shrimp mouth, heat sink, leg, gear Plate and sliding block.The beneficial effect of the utility model is：Quick-frozen Penaeus Vannmei can be facilitated, Penaeus Vannmei can pass through setting Household freezer and antistaling box carry out freezing and fresh-keeping, when needing all freezings or when fresh-keeping Penaeus Vannmei, Neng Goutong The lifting of baffle plate is crossed come so that the passage between household freezer and antistaling box is opened and closed, baffle plate has good heat-insulated guarantor Temp effect, the temperature between divided household freezer and incubator will not influence each other, display screen can show that household freezer and Temperature, oxygen content inside antistaling box, it can be adjusted by adjusting the button of operating panel surface, but at freezing Managing obtained shrimp mouthfeel can be deteriorated, and collecting the shrimp handled well need to artificially collect, and also have on the problem of device radiation certain Improvement space.

Utility model content

The purpose of this utility model is to provide a kind of simple to operate, it is ensured that peeled shrimp freshness and mouthfeel, chilling rate Hurry up, it is convenient to launch and collect peeled shrimp, device have excellent insulation, antifreezing effect a kind of freezing shrimp meat processing unit (plant).

The scheme that the utility model is taken to achieve the above object is：A kind of processing unit (plant) of freezing shrimp meat, including shell Body, antistaling box and household freezer in housing, housing is interior to separate antistaling box and household freezer provided with dividing plate, dividing plate both sides Housing top surface is provided with charging aperture, and housing side is provided with symmetrical discharging opening, and housing bottom is provided with heat sink and universal wheel, housing side Face is additionally provided with control panel and display screen, and device of the present utility model carries out freezing processing again after carrying out Preservation Treatment to peeled shrimp, Peeled shrimp freezing is uniform, and chilling rate is fast, and obtained freezing shrimp meat is in good taste, and surface is not easy particle-bound bacteria.

Preferably, antistaling box is connected with charging aperture, antistaling box upper end is provided with fan, and side wall is provided with air pump and water pump, water Pump is connected with reservoir chamber, fluid reservoir respectively by water pipe, and the water pipe junction of reservoir chamber and fluid reservoir is provided with reversal valve, reservoir chamber Upper end is provided with screen cloth, and screen cloth upper end is provided with sealing plate, and sealing plate outer end is connected with pressing plate, and antistaling box of the present utility model is interior by shrimp Benevolence is placed on sealing plate, be can be achieved to be cleaned respectively after cooling to peeled shrimp air blowing, is soaked, Preservation Treatment is carried out to peeled shrimp, Peeled shrimp is collected using screen cloth, whole process is operated by control panel and realized.

Preferably, screen cloth is installed with housing using inclination, the angle α of screen cloth and housing sidewall is 92 ° ~ 120 °, is passed through Installation is tilted, the separation of material and liquid can be carried out to peeled shrimp, and allows peeled shrimp to roll to discharging opening using gradient, without artificial Peeled shrimp is collected, reduces manual labor.

Preferably, the liquid placed in fluid reservoir is deodorization liquid or fresh-keeping liquid or baste, deodorization can be carried out to peeled shrimp Or fresh-keeping or seasoning is handled, be advantageous to be lifted the quality of peeled shrimp.

Preferably, fan is atomizing fan, atomizing fan and the angle of antistaling box side wall are 37 ° ~ 70 °, due to Cold air has the characteristics of sedimentation, and fog can have certain humidification to peeled shrimp, and peeled shrimp can be avoided to wait the process of immersion It is rotten, also there is certain cooling effect to peeled shrimp.

Preferably, baffle surface is sequentially coated with heat insulation coating, antifreezing coat and fungistatic coating from lower to upper, insulation applies The thickness ratio of layer, antifreezing coat and fungistatic coating is 2:1:1, the temperature in household freezer can be kept in baffle surface coating heat insulation coating It is too fast that degree avoids the cold air of household freezer from dissipating temperature, and the antifreezing coat of coating can prevent from freezing the temperature inside the box is too low to cause dividing plate to split Line cool air leakage, the fungistatic coating of coating can effectively prevent that freeze chamber interior wall breed bacteria impacts to peeled shrimp quality；Insulation Coating, antifreezing coat and fungistatic coating continue to coat next layer of coating after the drying, and heat insulation coating consists of the following composition：Epoxy Powdered whiting, the granularity 50 that resin, cement, methyl methacrylate, closed perlite, granularity are 50 microns~65 microns Micron~65 microns precipitated calcium carbonate, granularity be 50 microns~65 microns bamboo-carbon fibre, pigment, ethylene glycol, silicone oil, water； Antifreezing coat consists of the following composition：Triethylamine, o-phthalic acid dibutyl ester, calgon, butyl cellosolve, silica Fine sand, neoprene, copper chloride, fungistatic coating consist of the following composition：Antiseptic, organosilicate, silane coupler, water； Antiseptic is triclosan and pyrithione；By provided with each coating can improve the comprehensive mechanical property of dividing plate, avoid dividing plate By bursting by freezing or rust corrosion.

Preferably, radiating plate surface is provided with uniform circular hole, heat sink is provided with heat-conducting silicone grease with housing bottom surface junction Or conduction oil, after device is stopped, effectively the heat in household freezer and antistaling box can be conducted, avoid heat from accumulating Gather the service life in device internal influence freezing efficiency and device.

Preferably, freezing box wall is provided with uniform cool air hose, cool air hose is connected with air-cooler respectively, can make peeled shrimp Freezing is uniform, can also improve freezing efficiency, realize snap frozen peeled shrimp.

Preferably, household freezer by removable pin be connected with it is uniform it is two-way hold thing basin, the two-way thing basin that holds is by basin frame, basin plate Formed with removable pin, basin plate is connected by removable pin with basin frame, and sponge is provided between basin plate and basin frame, and basin plate surface is provided with uniform Circular hole, removable pin and basin plate coupling part be provided with uniform circular hole, and removable pin and household freezer junction are provided with screw thread, and outer end is set There are anti-slip veins, using the design peeled shrimp can be avoided to fall directly on discharging opening in two-way hold when thing basin inverts, the peeled shrimp of input is placed in First two-way to hold in thing basin, places after a period of time by operating personnel's rotary moveable pin, the two-way thing basin that holds is rotated into 180 °, By first two-way peeled shrimp held in thing basin put into second it is two-way hold in thing basin, operating personnel put into peeled shrimp to first pair again To thing basin is held, until peeled shrimp, to last two-way rotation input discharging opening after holding thing basin, it is quick-frozen that operating personnel export collection again Peeled shrimp afterwards.

Compared with prior art, the beneficial effects of the utility model are：Device of the present utility model carries out fresh-keeping to peeled shrimp Freezing processing is carried out after processing again, whole operation process only need to manually pour into peeled shrimp, and remaining process is by control panel control Device processed processes peeled shrimp, greatlys save manpower, in baffle surface coating heat insulation coating the temperature in household freezer can kept to keep away Exempting from the cold air of household freezer, to dissipate temperature too fast, and the antifreezing coat of coating can prevent from freezing the temperature inside the box is too low to cause dividing plate cracked cold Gas leaks, and the fungistatic coating of coating can effectively prevent that freeze chamber interior wall breed bacteria impacts to peeled shrimp quality；This practicality is new The peeled shrimp freezing of type processing is uniform, and chilling rate is fast, and obtained freezing shrimp meat is in good taste, and surface is not easy particle-bound bacteria.

Brief description of the drawings

Fig. 1 is a kind of overall structure diagram of the processing unit (plant) of freezing shrimp meat of the utility model；

Fig. 2 is a kind of structural representation of the antistaling box of the processing unit (plant) of freezing shrimp meat of the utility model；

Fig. 3 is a kind of structural representation of the household freezer of the processing unit (plant) of freezing shrimp meat of the utility model；

Fig. 4 is a kind of two-way structural representation for holding thing basin of processing unit (plant) of freezing shrimp meat of the utility model.

Description of reference numerals：1 housing；2 charging apertures；3 air pumps；4 universal wheels；5 heat sinks；6 dividing plates；7 control panels；8 is cold Blower fan；9 display screens；10 discharging openings；11 antistaling boxes；12 pressing plates；13 sealing plates；14 screen clothes；15 fans；16 water pumps；17 water pipes；18 Reservoir chamber；19 reversal valves；20 fluid reservoirs；21 household freezers；22 two-way hold thing basin；221 sponges；222 basin frames；223 basin plates；224 live Dynamic pin；23 cool air hoses；24 infrared heaters.

Specific embodiment

It is described in further detail with reference to embodiments with accompanying drawing：

Embodiment 1：

As Figure 1-4, a kind of processing unit (plant) of freezing shrimp meat, including housing 1, the antistaling box 11 in housing 1 With household freezer 21, housing 1 is interior to separate antistaling box 11 and household freezer 21 provided with dividing plate 6, and the top surface of housing 1 of the both sides of dividing plate 6 is provided with Charging aperture 2, the side of housing 1 are provided with symmetrical discharging opening 10, and the bottom of housing 1 is provided with heat sink 5 and universal wheel 4, and the side of housing 1 is also Provided with control panel 7 and display screen 9, device of the present utility model carries out freezing processing, shrimp again after carrying out Preservation Treatment to peeled shrimp Benevolence freezing is uniform, and chilling rate is fast, and obtained freezing shrimp meat is in good taste, and surface is not easy particle-bound bacteria.

Antistaling box 11 is connected with charging aperture 2, and the upper end of antistaling box 11 is provided with fan 15, and side wall is provided with air pump 3 and water pump 16, water Pump 16 is connected with reservoir chamber 18, fluid reservoir 24 respectively by water pipe 17, and the junction of water pipe 17 of reservoir chamber 18 and fluid reservoir 24 is set There is reversal valve 19, the upper end of reservoir chamber 18 is provided with screen cloth 14, and the upper end of screen cloth 14 is provided with sealing plate 13, and the outer end of sealing plate 13 is connected with pressure Plate 12, antistaling box 11 of the present utility model is interior to be placed on peeled shrimp on sealing plate 13, can be achieved to distinguishing after peeled shrimp air blowing cooling Cleaned, soaked, Preservation Treatment is carried out to peeled shrimp, collected peeled shrimp using screen cloth 14, whole process passes through control The operation of panel 7 is realized.

The upper end of antistaling box 11 is additionally provided with infrared heater 24, when needing processing without peeled shrimp in device, opens infrared ray Heater 24 heats to the inwall of antistaling box 11, can eliminate the moisture on the inwall of antistaling box 11 and avoid growing carefully on inwall Bacterium causes to corrode while also impact the edible safety of peeled shrimp to the inwall of antistaling box 11.

Screen cloth 14 is installed with housing 1 using inclination, and the angle α of screen cloth 14 and the side wall of housing 1 is 100 °, by tilting peace Dress, the separation of material and liquid can be carried out to peeled shrimp, and allow peeled shrimp to roll to discharging opening 10 using gradient, without artificially collecting Peeled shrimp, reduce manual labor.

The liquid placed in fluid reservoir 24 is fresh-keeping liquid, can carry out Preservation Treatment to peeled shrimp, be advantageous to be lifted the product of peeled shrimp Matter.

Fan 15 is atomizing fan, and atomizing fan and the angle of antistaling box side wall are 45 °, because cold air has sedimentation The characteristics of, fog can have certain humidification to peeled shrimp, peeled shrimp can be avoided to wait the process of immersion to go bad, also to peeled shrimp There is certain cooling effect.

The surface of dividing plate 6 is sequentially coated with heat insulation coating, antifreezing coat and fungistatic coating from lower to upper, heat insulation coating, antifreeze The thickness ratio of coating and fungistatic coating is 2:1:1, in baffle surface coating heat insulation coating the temperature in household freezer 21 can be kept to keep away Exempting from the cold air of household freezer 21, to dissipate temperature too fast, and the antifreezing coat of coating, which can prevent in household freezer 21 that temperature is too low, causes dividing plate 6 to occur Crackle cool air leakage, the fungistatic coating of coating can effectively prevent the inwall breed bacteria of household freezer 21 from being impacted to peeled shrimp quality； Heat insulation coating, antifreezing coat and fungistatic coating continue to coat next layer of coating after the drying, and heat insulation coating consists of the following composition： Epoxy resin, cement, methyl methacrylate, closed perlite, the powdered whiting that granularity is 50 microns~65 microns, granularity For bamboo-carbon fibre that 50 microns~65 microns of precipitated calcium carbonate, granularity are 50 microns~65 microns, pigment, ethylene glycol, silicone oil, Water；Antifreezing coat consists of the following composition：Triethylamine, o-phthalic acid dibutyl ester, calgon, butyl cellosolve, dioxy SiClx fine sand, neoprene, copper chloride, fungistatic coating consist of the following composition：Antiseptic, organosilicate, silane coupler, Water；Antiseptic is triclosan and pyrithione；By provided with each coating can improve the comprehensive mechanical property of dividing plate 6, avoid Dividing plate 6 is by bursting by freezing or rust corrosion.

The surface of heat sink 5 is provided with uniform circular hole, and heat sink 5 can be in device provided with conduction oil with the bottom surface junction of housing 1 When out of service, the heat in household freezer 21 and antistaling box 11 is conducted, avoids heat from accumulating in device internal influence cold Freeze efficiency and the service life of device.

The madial wall of household freezer 21 is provided with uniform cool air hose 23, and cool air hose 23 is connected with air-cooler 8 respectively, and peeled shrimp can be made cold Freeze uniformly, can also improve freezing efficiency, realize snap frozen peeled shrimp.

Household freezer 21 by removable pin be connected with it is uniform it is two-way hold thing basin 22, the two-way thing basin 22 that holds is by basin frame 222, basin plate 223 and removable pin 224 form, basin plate 223 is connected by removable pin 224 with basin frame 222, is provided between basin plate 223 and basin frame 222 Sponge 221, the surface of basin plate 223 are provided with uniform circular hole, and removable pin 224 is provided with uniform circular hole with the coupling part of basin plate 223, living Dynamic pin 224 is provided with screw thread with the junction of household freezer 21, and outer end is provided with anti-slip veins, and peeled shrimp can be avoided in basin plate 223 using the design Directly dropped out during reversion outside lower section basin frame 222, the peeled shrimp of input be placed in first it is two-way hold in thing basin 22, after placing a period of time By operating personnel by screw thread rotation removable pin, anti-slip veins can prevent operating personnel's hand from skidding, and the two-way thing basin 22 that holds is rotated 180 °, by first two-way peeled shrimp held in thing basin 22 put into second it is two-way hold in thing basin 22, operating personnel put into shrimp again Benevolence to first it is two-way hold thing basin 22, until peeled shrimp two-way holds rotation input discharging opening 10, operator after thing basin 22 to last Member export again collect it is quick-frozen after peeled shrimp, sponge 221 is provided between basin plate 223 and basin frame 222, peeled shrimp can be avoided to fall by gap Enter next moisture for holding thing basin, also caning absorb part peeled shrimp surface, beneficial to peeled shrimp snap frozen, the surface of basin plate 223 is provided with equal The circular hole of cloth, uniform circular hole is provided with the coupling part of basin plate 223 beneficial to by the moisture bleeding on peeled shrimp surface, removable pin 224, can Mitigate the two-way weight for holding thing basin 22 and be additionally favorable for drip and remove peeled shrimp moisture, and the mechanical property of removable pin 224 is not influenceed.

Embodiment 2：

As Figure 1-4, pending peeled shrimp is now passed through feeding mouth 2 by device of the present utility model in real work It is thrown in antistaling box 11, fan 15 is cooled to peeled shrimp and blows fog to peeled shrimp surface, used chain of command in antistaling box 11 Plate 7 opens water pump 16 and the water in reservoir chamber 18 is passed through in antistaling box 11, is then turned on air pump 3, makes to contain higher oxygen in water, Prevent peeled shrimp from going bad, and cause peeled shrimp freshness not high, by unclamping pressing plate 12, pull out sealing plate 13, water is drained back into water storage In room 18, the clamping platen 12 of sealing plate 13 is put back to, reversal valve 19 is changed, and the fresh-keeping liquid in the extraction fluid reservoir 20 of water pump 16 is to peeled shrimp Immersion treatment, when needing quick-frozen, by unclamping pressing plate 12, sealing plate 13 is pulled out, is discharged water into reservoir chamber 18, after immersion Reservoir chamber 18 can be carried out changing water, and utilize the screen cloth 14 of centre to collect peeled shrimp, screen cloth 14 is installed with housing 1 using inclination, sieve Net 14 and the angle α of the side wall of housing 1 are 98 °, are installed by tilting, and the separation of material and liquid, and profit can be carried out to peeled shrimp Allow peeled shrimp to roll to discharging opening 10 with gradient, without artificially collecting peeled shrimp, reduce manual labor, the upper end of antistaling box 11 is also set There is infrared heater 24, when needing processing without peeled shrimp in device, open infrared heater 24 and the inwall of antistaling box 11 is entered Row heats, and can eliminate the moisture on the inwall of antistaling box 11 and avoid breed bacteria on inwall from causing to corrode to the inwall of antistaling box 11 Also the edible safety of peeled shrimp is impacted simultaneously；Peeled shrimp is put into household freezer 21 after peeled shrimp takes out, passes through control Panel 7 starts air-cooler 8, and the air outlet of air-cooler 8 is evenly distributed in household freezer 21, and peeled shrimp freezing can be made uniform, may be used also Improve freezing efficiency, realize snap frozen peeled shrimp, the peeled shrimp of input be placed in first it is two-way hold in thing basin 22, place a period of time Afterwards by operating personnel's rotary moveable pin, the two-way thing basin 22 that holds is rotated 180 °, by first two-way peeled shrimp held in thing basin 22 Input to second it is two-way hold in thing basin 22, operating personnel put into again peeled shrimp to first it is two-way hold thing basin 22, until peeled shrimp is to most The latter is two-way to hold rotation after thing basin 22 and puts into out shrimp mouth 10, operating personnel export again collect it is quick-frozen after peeled shrimp, in the table of dividing plate 6 Face coating heat insulation coating can avoid the cold air of household freezer 21 from dissipating, and temperature is too fast, and the surface of heat sink 5 is provided with uniform circular hole, heat sink 5 Conduction oil is provided with the bottom surface junction of housing 1, effectively the heat in household freezer 21 and antistaling box 11 can be conducted, avoided Heat accumulates in the service life of device internal influence freezing efficiency and device.

The angle α of screen cloth 14 and the side wall of housing 1 is not limited only to 92 ° ~ 120 °, should also include 92 ° or 92.1 ° or 92.2 ° or 92.3 ° ... or 119.9 ° or 120 °；Atomizing fan and the angle of antistaling box side wall are not limited only to 37 ° ~ 70 °, should also include 37 ° or 37.1 ° or 37.2 ° or 37.3 ° ... 69.9 ° or 70 °.

Routine techniques in above-described embodiment or it is conventional be connected as prior art known to a person skilled in the art, therefore This be not described in detail.

Specific embodiment described herein is only to the utility model explanation for example, the affiliated skill of the utility model The technical staff in art field can make various modifications or supplement to described specific embodiment or use similar side Formula substitutes, but without departing from of the present utility model or surmount scope defined in appended claims.

Claims (9)

1. a kind of processing unit (plant) of freezing shrimp meat, including housing（1）, installed in housing（1）Interior antistaling box（11）And household freezer （21）, it is characterised in that：The housing（1）It is interior to be provided with dividing plate（6）By antistaling box（11）With household freezer（21）Separate, the dividing plate （6）The housing of both sides（1）Top surface is provided with charging aperture（2）, the housing（1）Side is provided with symmetrical discharging opening（10）, the shell Body（1）Bottom is provided with heat sink（5）And universal wheel（4）, the housing（1）Side is additionally provided with control panel（7）And display screen （9）.

A kind of 2. processing unit (plant) of freezing shrimp meat according to claim 1, it is characterised in that：The antistaling box（11）With entering Material mouth（2）Connection, the antistaling box（11）Upper end is provided with fan（15）, side wall is provided with air pump（3）And water pump（16）, the water pump （16）Pass through water pipe（17）Respectively with reservoir chamber（18）, fluid reservoir（24）Connection, the reservoir chamber（18）With fluid reservoir（24）'s Water pipe（17）Junction is provided with reversal valve（19）, the reservoir chamber（18）Upper end is provided with screen cloth（14）, the screen cloth（14）Upper end Provided with sealing plate（13）, the sealing plate（13）Outer end is connected with pressing plate（12）.

A kind of 3. processing unit (plant) of freezing shrimp meat according to claim 2, it is characterised in that：The screen cloth（14）With housing （1）Installed using tilting, screen cloth（14）With housing（1）The angle α of side wall is 92 ° ~ 120 °.

A kind of 4. processing unit (plant) of freezing shrimp meat according to claim 2, it is characterised in that：The fluid reservoir（24）Inside put The liquid put is deodorization liquid or fresh-keeping liquid or baste.

A kind of 5. processing unit (plant) of freezing shrimp meat according to claim 2, it is characterised in that：The fan（15）For spraying Formula fan, the atomizing fan and the angle of antistaling box side wall are 37 ° ~ 70 °.

A kind of 6. processing unit (plant) of freezing shrimp meat according to claim 1, it is characterised in that：The dividing plate（6）Surface by Under be up sequentially coated with heat insulation coating, antifreezing coat and fungistatic coating, the heat insulation coating, antifreezing coat and fungistatic coating Thickness ratio is 2:1:1.

A kind of 7. processing unit (plant) of freezing shrimp meat according to claim 1, it is characterised in that：The heat sink（5）Surface Provided with uniform circular hole, the heat sink（5）With housing（1）Bottom surface junction is provided with heat-conducting silicone grease or conduction oil.

A kind of 8. processing unit (plant) of freezing shrimp meat according to claim 1, it is characterised in that：The household freezer（21）Inner side Wall is provided with uniform cool air hose（23）, the cool air hose（23）Respectively with air-cooler（8）Connection.

A kind of 9. processing unit (plant) of freezing shrimp meat according to claim 1, it is characterised in that：The household freezer（21）Pass through Removable pin, which is connected with, uniform two-way holds thing basin（22）, it is described two-way to hold thing basin（22）By basin frame（222）, basin plate（223）And work Dynamic pin（224）Composition, the basin plate（223）Pass through removable pin（224）With basin frame（222）Connection, the basin plate（223）With basin frame （222）Between be provided with sponge（221）, the basin plate（223）Surface is provided with uniform circular hole, the removable pin（224）With basin plate （223）Coupling part is provided with uniform circular hole, the removable pin（224）With household freezer（21）Junction is provided with screw thread, and outer end is set There are anti-slip veins.