CN219700564U - Sterilizing equipment for producing Yuling ointment - Google Patents

Abstract

The utility model relates to the technical field of traditional Chinese medicine processing, in particular to sterilizing equipment for producing a Yuling ointment, which is used for sterilizing the Yuling ointment through a sterilizing lamp and a silver ion sterilizing agent box, and accelerating the airing of the Yuling ointment through circulating natural wind, so that the practicality is good; comprises a sterilizing lamp; still include sterilization case, the chuck, the material dish, the case lid, silver ion germicide box, the active carbon box, rabbling mechanism and natural wind system, get and put mouthful and sterilization cavity intercommunication, the chuck is installed in sterilization cavity, the material dish clamps on the chuck, hold the jade cream in the material dish, the case lid is installed and is got and put mouthful, rabbling mechanism installs on the case lid, the jade cream in the rabbling mechanism stirring material dish, the sterilamp is located sterilization cavity, the sterilamp shines the jade cream in the material dish, natural wind system is located sterilization case's external world, natural wind system's air outlet stretches into sterilization cavity's bottom, and set up silver ion germicide box, natural wind system's air intake stretches into sterilization cavity's upper portion, and set up the active carbon box.

Description

Sterilizing equipment for producing Yuling ointment

Technical Field

The utility model relates to the technical field of traditional Chinese medicine processing, in particular to sterilization equipment for producing a Yuling ointment.

Background

Yuling ointment is a dietotherapy ancient prescription of traditional Chinese medicine, and is mainly prepared from longan pulp and American ginseng, and is a selective product for replenishing blood and tonifying qi. The production of the Yuling ointment generally requires the processing procedures of raw material treatment, repeated high Wen Qingzheng, repeated natural cooling and the like.

The packaging can be carried out only by cooling the side bottom after steaming, the cooling process is long in time consumption, and the cooling process is easy to be invaded by external harmful bacteria, so that the packaged jade cream is easy to deteriorate, the shelf life is shortened, and sterilization is also required for improving the shelf life of the jade cream, so that sterilization equipment capable of accelerating cooling of the jade cream is required.

Disclosure of Invention

In order to solve the technical problems, the utility model provides sterilizing equipment for producing the Yuling ointment, which is used for sterilizing the Yuling ointment through a sterilizing lamp (5) and a silver ion sterilizing agent box, and accelerating the cooling of the Yuling ointment through circulating natural wind, and has good practicability.

The sterilizing equipment for producing the Yuling ointment comprises a sterilizing lamp; the device comprises a sterilizing box, a chuck, a material disc, a box cover, a silver ion bactericide box, an active carbon box, a stirring mechanism and a natural wind system, wherein a sterilizing chamber is arranged in the sterilizing box, a taking and placing opening is formed in the upper end of the sterilizing box, the taking and placing opening is communicated with the sterilizing chamber, the chuck is arranged in the sterilizing chamber, the material disc is clamped on the chuck, a jade cream is contained in the material disc, the box cover is arranged on the taking and placing opening, the stirring mechanism is arranged on the box cover, the stirring mechanism is used for stirring the jade cream in the material disc, a sterilizing lamp is positioned in the sterilizing chamber, the sterilizing lamp irradiates the jade cream in the material disc, the natural wind system is positioned outside the sterilizing box, an air outlet of the natural wind system extends into the bottom of the sterilizing chamber, the silver ion bactericide box is arranged, an air inlet of the natural wind system extends into the upper part of the sterilizing chamber, and the active carbon box is arranged; during operation, the material disc containing the hot jade cream is clamped on the chuck, the box cover is arranged on the taking and placing opening of the sterilizing box, the stirring mechanism stretches into the jade cream of the material disc, the sterilizing lamp, the stirring mechanism and the natural wind system are started, the stirring mechanism stirs and turns over the jade cream, heat and water vapor are rapidly released, the sterilizing lamp is used for sterilizing the stirred jade cream, the air inlet of the natural wind system is used for extracting high-temperature hot air and water vapor which are gathered at the top of the sterilizing chamber of the sterilizing box and adsorbing impurities therein through the active carbon box, the natural wind system is used for outputting natural wind, after being sterilized by the silver ion sterilizing agent box, the natural wind is input into the sterilizing chamber of the sterilizing box through the air outlet, so that the input natural wind is rich in silver ions, the silver ions can kill harmful bacteria in the air and the jade cream, and the heat and the redundant water vapor of the stirred jade cream are taken away by the circulating natural wind, and therefore the cooling is accelerated, and the practicability is good.

Preferably, the cold air system comprises a heat radiation box, an air outlet pipe, a fan and an air suction pipe, wherein the heat radiation box is positioned outside the sterilization box, the output end of the heat radiation box is connected with the input end of the air outlet pipe, the output end of the air outlet pipe is provided with a silver ion sterilization agent box, the output end of the air outlet pipe extends into the bottom of a sterilization cavity of the sterilization box, the fan is arranged on the air outlet pipe, the input end of the heat radiation box is connected with the output end of the air suction pipe, the input end of the air suction pipe is provided with an active carbon box, and the input end of the fan extends into the upper part of the sterilization cavity of the sterilization box; the fan operation is through going out tuber pipe and active carbon box and to the air supply in the sterilization cavity of sterilization case, and the air in the sterilization cavity of sterilization case gets back to in the heat dissipation case through active carbon box and aspiration channel, heat exchange with outside air to with the inside air cooling of heat dissipation case, realize cooling air's inner loop, reduce outside harmful fungus and get into, improve the sterilization effect.

Preferably, the heat dissipation device further comprises a residual discharging pipe, wherein the input end of the residual discharging pipe is connected with the bottom of the heat dissipation box; condensed water in the heat dissipation box is conveniently discharged through the residual discharging pipe.

Preferably, the stirring mechanism comprises a stirring motor, a stirring rod, a cross rod, a plow blade, a trowelling rod and a trowelling plate, wherein the stirring motor is arranged on the box cover, an output shaft of the stirring motor is rotationally connected with the box cover, the lower end of the output shaft of the stirring motor is in transmission connection with the stirring rod, the stirring rod is positioned in a sterilization cavity of the sterilization box, one side of the lower end of the stirring rod is provided with the cross rod, the plow blade is arranged at the lower part of the cross rod, the trowelling rod is arranged at the other side of the lower end of the stirring rod, and the trowelling plate is arranged at the lower part of the trowelling rod in an inclined manner; the stirring motor drives the stirring rod to rotate, the stirring rod drives the cross rod and the plough blade to rotate, the plough blade stirs the jade cream in the material disc, meanwhile, the stirring rod drives the trowelling rod and the trowelling plate to rotate, and the trowelling plate trowells the jade cream stirred up by the plough blade, so that the plough blade stirs the jade cream again, and all the jade creams are stirred.

Preferably, the stirring device further comprises a clamping block, wherein the upper end of the stirring rod is provided with the clamping block, and the lower end of the output shaft of the stirring motor is provided with a clamping groove matched with the clamping block; the puddler passes through the draw-in groove clamping of fixture block and agitator motor's output shaft to be connected, realizes quick installation dismantlement to the transmission is stable, simple structure practicality is good.

Preferably, the sterilizing device further comprises a sliding block, a sliding rod, a spring and a lifting push rod, wherein a vertical sliding groove is formed in the lower portion of the stirring rod, the sliding block is arranged at the inner end of the trowelling rod, the sliding rod is arranged in the sliding groove of the stirring rod, the sliding block is in sliding connection with the sliding rod, the lower end of the spring is connected with the sliding block, the upper end of the spring is connected with the top wall of the sliding groove of the stirring rod, the fixed end of the lifting push rod is arranged at the bottom of a sterilizing chamber of the sterilizing box, and a piston rod of the lifting push rod is connected with the chuck; when stirring the jade cream in the material dish, the outer end slip overlap joint of strikeeing the pole is on the edge of material dish, thereby carry out spacingly to strikeeing pole and strikee board, the elasticity of spring compresses tightly the slider downwards along the slide bar moreover, make the strikee board float the jade cream, lift push rod shrink makes chuck and material dish reduce height after sterilization and cooling completion, make plough piece and jade cream break away from, the elasticity of spring makes strikee pole and strikee board follow the material dish and reduce, the puddler drives strikee pole and strikee board and continues to rotate, thereby make the strikee board float the jade cream of cooling, convenient follow-up packing, the practicality is good.

Preferably, the device also comprises a roller, wherein the roller is rotatably arranged at the outer end of the troweling rod, and the roller is in rolling contact with the edge of the material disc; the roller rolls and supports the trowelling rod, so that friction between the trowelling rod and the material disc is reduced.

Compared with the prior art, the utility model has the beneficial effects that: during operation, the material disc containing the hot jade cream is clamped on the chuck, the box cover is arranged on the taking and placing opening of the sterilizing box, the stirring mechanism stretches into the jade cream of the material disc, the sterilizing lamp, the stirring mechanism and the natural wind system are started, the stirring mechanism stirs and turns over the jade cream, heat and water vapor are rapidly released, the sterilizing lamp is used for sterilizing the stirred jade cream, the air inlet of the natural wind system is used for extracting high-temperature hot air and water vapor which are gathered at the top of the sterilizing chamber of the sterilizing box and adsorbing impurities therein through the active carbon box, the natural wind system is used for outputting natural wind, after being sterilized by the silver ion sterilizing agent box, the natural wind is input into the sterilizing chamber of the sterilizing box through the air outlet, so that the input natural wind is rich in silver ions, the silver ions can kill harmful bacteria in the air and the jade cream, and the heat and the redundant water vapor of the stirred jade cream are taken away by the circulating natural wind, and therefore the cooling is accelerated, and the practicability is good.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the front cross-section of the present utility model;

FIG. 3 is a schematic illustration of an axially measured structure of the present utility model;

FIG. 4 is a schematic structural view of the chuck, material tray, stirring mechanism and other structures;

the reference numerals in the drawings: 1. a sterilization box; 2. a chuck; 3. a material tray; 4. a case cover; 5. a sterilizing lamp; 6. silver ion germicide box; 7. an activated carbon cartridge; 8. a heat radiation box; 9. an air outlet pipe; 10. a blower; 11. an air suction pipe; 12. a residual tube is arranged; 13. a stirring motor; 14. a stirring rod; 15. a cross bar; 16. a plow blade; 17. a troweling rod; 18. a troweling plate; 19. a clamping block; 20. a slide block; 21. a slide bar; 22. a spring; 23. lifting the push rod; 24. and a roller.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. This utility model may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

The sterilizing equipment for producing the Yuling ointment comprises a sterilizing lamp 5; the automatic sterilizing device is characterized by further comprising a sterilizing box 1, a chuck 2, a material disc 3, a box cover 4, a silver ion sterilizing agent box 6, an activated carbon box 7, a stirring mechanism and a natural wind system, wherein a sterilizing chamber is arranged in the sterilizing box 1, a taking and placing opening is formed in the upper end of the sterilizing box 1 and communicated with the sterilizing chamber, the chuck 2 is arranged in the sterilizing chamber, the material disc 3 is clamped on the chuck 2, the material disc 3 is filled with jade ointment, the box cover 4 is arranged on the taking and placing opening, the stirring mechanism is arranged on the box cover 4, the stirring mechanism is used for stirring the jade ointment in the material disc 3, a sterilizing lamp 5 is arranged in the sterilizing chamber, the sterilizing lamp 5 irradiates the jade ointment in the material disc 3, the natural wind system is arranged outside the sterilizing box 1, an air outlet of the natural wind system stretches into the bottom of the sterilizing chamber, an air inlet of the silver ion sterilizing agent box 6 is arranged, and an air inlet of the natural wind system stretches into the upper part of the sterilizing chamber, and the activated carbon box 7 is arranged; the cold air system comprises a heat radiation box 8, an air outlet pipe 9, a fan 10 and an air suction pipe 11, wherein the heat radiation box 8 is positioned outside the sterilization box 1, the output end of the heat radiation box 8 is connected with the input end of the air outlet pipe 9, the silver ion sterilization agent box 6 is arranged at the output end of the air outlet pipe 9, the output end of the air outlet pipe 9 extends into the bottom of a sterilization chamber of the sterilization box 1, the fan 10 is arranged on the air outlet pipe 9, the input end of the heat radiation box 8 is connected with the output end of the air suction pipe 11, the active carbon box 7 is arranged at the input end of the air suction pipe 11, and the input end of the fan 10 extends into the upper part of the sterilization chamber of the sterilization box 1; the heat radiation box further comprises a residual discharging pipe 12, and the input end of the residual discharging pipe 12 is connected with the bottom of the heat radiation box 8.

During operation, the material disc 3 containing the hot jade cream is clamped on the chuck 2, the box cover 4 is arranged on the taking and placing opening of the sterilizing box 1, the stirring mechanism stretches into the jade cream in the material disc 3, the sterilizing lamp 5, the stirring mechanism and the fan 10 are started, the fan 10 runs to blow air into the sterilizing chamber of the sterilizing box 1 through the air outlet pipe 9 and the activated carbon box 7, the air in the sterilizing chamber of the sterilizing box 1 returns into the heat dissipating box 8 through the activated carbon box 7 and the air suction pipe 11, the heat dissipating box 8 exchanges heat with the external air, thereby cooling the air in the heat dissipating box 8, realizing the internal circulation of the cooling air, reducing the entry of external harmful bacteria, the stirring mechanism stirs and turns over the jade cream, and the heat and the water vapor are rapidly released, the sterilizing lamp 5 sterilizes the jade ointment that stirs, the aspiration channel 11 will gather at the high temperature steam and the vapor at sterilizing chamber top of sterilizing the case 1 and adsorb impurity wherein through active carbon box 7, the natural wind of air-out pipe 9 output is through the disinfection of silver ion sterilant box 6 back through the air outlet input to sterilizing chamber of sterilizing case 1, make the natural wind of input rich in silver ion, silver ion can kill the harmful bacteria in air and the jade ointment, the natural wind of circulation flow takes away the heat and the unnecessary vapor of jade ointment that stirs simultaneously, thereby accelerate the cooling, the practicality is good, the residual pipe 12 of discharging after a period of time is through the cooling in the cooling box 8.

Example 2

The stirring mechanism comprises a stirring motor 13, a stirring rod 14, a cross rod 15, a plow blade 16, a trowelling rod 17 and a trowelling plate 18, wherein the stirring motor 13 is arranged on the box cover 4, an output shaft of the stirring motor 13 is rotationally connected with the box cover 4, the lower end of the output shaft of the stirring motor 13 is in transmission connection with the stirring rod 14, the stirring rod 14 is positioned in a sterilization chamber of the sterilization box 1, the cross rod 15 is arranged on one side of the lower end of the stirring rod 14, the plow blade 16 is arranged on the lower part of the cross rod 15, the trowelling rod 17 is arranged on the other side of the lower end of the stirring rod 14, the trowelling plate 18 is arranged on the lower part of the trowelling rod 17, and the trowelling plate 18 is obliquely arranged; the stirring rod comprises a stirring motor 13, a stirring rod 14, a stirring rod, a clamping block 19, a clamping groove matched with the clamping block 19, a stirring rod and a stirring rod; the device further comprises a sliding block 20, a sliding rod 21, a spring 22 and a lifting push rod 23, wherein a vertical sliding groove is formed in the lower portion of the stirring rod 14, the sliding block 20 is arranged at the inner end of the trowelling rod 17, the sliding rod 21 is arranged in the sliding groove of the stirring rod 14, the sliding block 20 is in sliding connection with the sliding rod 21, the lower end of the spring 22 is connected with the sliding block 20, the upper end of the spring 22 is connected with the top wall of the sliding groove of the stirring rod 14, the fixed end of the lifting push rod 23 is arranged at the bottom of a sterilization chamber of the sterilization box 1, and a piston rod of the lifting push rod 23 is connected with the chuck 2; the material tray further comprises a roller 24, the roller 24 is rotatably arranged at the outer end of the trowelling rod 17, and the roller 24 is in rolling contact with the edge of the material tray 3.

The puddler 14 passes through the draw-in groove clamping of fixture block 19 with the output shaft of agitator motor 13 to be connected, realize quick installation dismantlement, agitator motor 13 drive puddler 14 rotates, puddler 14 drives horizontal pole 15 and plough piece 16 rotation, the jade of plough piece 16 stirring in the material dish 3 is like cream, simultaneously puddler 14 drives the rotation of strikethrough pole 17 and strikethrough board 18, gyro wheel 24 on the outer end of strikethrough pole 17 rolls on the edge of material dish 3, thereby carry out spacingly to strikethrough pole 17 and strikethrough board 18, and the elasticity of spring 22 compresses tightly slider 20 downwards along slide bar 21, make strikethrough board 18 to the jade cream of strikethrough, strikethrough board 18 will be stirred up by plough piece 16, make plough piece 16 stir the jade cream again, be favorable to making all jade obtain the stirring, after sterilization and airing are accomplished, lift push rod 23 shrink makes chuck 2 and material dish 3 reduce the height, make plough piece 16 and jade cream break away from, the elasticity of spring 22 makes strikethrough pole 17 and dull and board 18 reduce, stirring pole 14 and strikethrough board 18 drive the flat board 18 and make the smooth board 18 to continue to rotate, thereby the flat board is convenient to hang down.

As shown in figures 1 to 4, in the sterilizing equipment for producing the jade ointment, when the sterilizing equipment is in operation, firstly, a material disc 3 containing the hot jade ointment is clamped on a chuck 2, a box cover 4 is arranged on a taking and placing opening of a sterilizing box 1, a plow blade 16 stretches into the jade ointment of the material disc 3, the lower end of a plastering plate 18 is contacted with the jade ointment, then a sterilizing lamp 5, a stirring motor 13 and a fan 10 are started, the stirring motor 13 drives a stirring rod 14 to rotate, the stirring rod 14 drives a cross rod 15 and a plow blade 16 to rotate, the plow blade 16 stirs the jade ointment in the material disc 3, meanwhile, the stirring rod 14 drives a leveling rod 17 and the plastering plate 18 to rotate, the plastering plate 18 stirs the jade ointment turned up by the plow blade 16 to be leveled, so that heat and water vapor are released rapidly, then the stirred jade ointment is sterilized by the lamp 5, the fan 10 runs to a cavity of the sterilizing box 1 through an air outlet pipe 9 and an active carbon box 7, natural wind is naturally fed into the sterilizing box 1 through the air outlet 6, the cavity of the sterilizing box is filled with silver ion absorbent 7, the natural wind is fully sucked into the sterilizing box 1, the natural wind is fully air, and the natural wind is fully sucked into the sterilizing box 8 through the cavity of the sterilizing box, and the air is cooled down in the sterilizing box is cooled down, and finally the air is cooled by the active carbon box 8, and the air is cooled down in the sterilizing box is cooled down by the air is cooled by the air box 8, and the air is cooled by the active carbon box 8.

The main functions realized by the utility model are as follows:

1. the jade ointment is sterilized by the sterilizing lamp 5 and the silver ion sterilizing agent box 6, and the jade ointment is cooled by circulating natural wind, so that the practicality is good;

2. can be trowelled to cool the jade ointment, and is convenient to package.

The sterilizing equipment for producing the Yuling ointment has the advantages that the mounting mode, the connecting mode or the setting mode is a common mechanical mode, and the sterilizing equipment can be implemented as long as the beneficial effects can be achieved; the chuck 2, the sterilizing lamp 5, the silver ion sterilizing agent box 6, the active carbon box 7, the heat radiation box 8, the fan 10, the stirring motor 13, the slide bar 21, the spring 22, the roller 24 and the lifting push rod 23 of the sterilizing equipment for producing the Yuling ointment are purchased in the market, and the man skilled in the art only needs to install and operate according to the attached using instruction without the creative labor of the man skilled in the art.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (7)

1. The sterilizing equipment for producing the Yuling ointment comprises a sterilizing lamp (5); the automatic sterilizing device is characterized by further comprising a sterilizing box (1), a chuck (2), a material disc (3), a box cover (4), a silver ion sterilizing agent box (6), an active carbon box (7), a stirring mechanism and a natural wind system, wherein a sterilizing cavity is formed in the sterilizing box (1), a taking and placing opening is formed in the upper end of the sterilizing box (1), the taking and placing opening is communicated with the sterilizing cavity, the chuck (2) is arranged in the sterilizing cavity, the material disc (3) is clamped on the chuck (2), a jade ointment is contained in the material disc (3), the box cover (4) is arranged on the taking and placing opening, the stirring mechanism is arranged on the box cover (4), the jade ointment in the material disc (3) is stirred by the stirring mechanism, a sterilizing lamp (5) is arranged in the sterilizing cavity, the jade ointment in the material disc (3) is irradiated by the sterilizing lamp (5), the natural wind system is arranged outside the sterilizing box (1), an air outlet of the natural wind system stretches into the bottom of the sterilizing cavity, the silver ion sterilizing agent box (6) is arranged, an air inlet of the natural wind system stretches into the upper part of the sterilizing cavity, and the active carbon box (7) is arranged.

2. The sterilizing equipment for producing the yuling paste according to claim 1, wherein the cold air system comprises a heat dissipation box (8), an air outlet pipe (9), a fan (10) and an air suction pipe (11), the heat dissipation box (8) is positioned outside the sterilizing box (1), the output end of the heat dissipation box (8) is connected with the input end of the air outlet pipe (9), the silver ion sterilizing agent box (6) is arranged at the output end of the air outlet pipe (9), the output end of the air outlet pipe (9) extends into the bottom of a sterilizing chamber of the sterilizing box (1), the fan (10) is arranged on the air outlet pipe (9), the input end of the heat dissipation box (8) is connected with the output end of the air suction pipe (11), the active carbon box (7) is arranged at the input end of the air suction pipe (11), and the input end of the fan (10) extends into the upper part of the sterilizing chamber of the sterilizing box (1).

3. The sterilization equipment for producing the yuling ointment according to claim 2, which is characterized by further comprising a residual discharging pipe (12), wherein the input end of the residual discharging pipe (12) is connected with the bottom of the heat radiation box (8).

4. The sterilization equipment for producing jade cream according to claim 1, characterized in that the stirring mechanism comprises a stirring motor (13), a stirring rod (14), a cross rod (15), a plough piece (16), a screeding rod (17) and a screeding plate (18), wherein the stirring motor (13) is installed on the box cover (4), an output shaft of the stirring motor (13) is rotationally connected with the box cover (4), the lower end of the output shaft of the stirring motor (13) is in transmission connection with the stirring rod (14), the stirring rod (14) is positioned in a sterilization chamber of the sterilization box (1), the cross rod (15) is installed on one side of the lower end of the stirring rod (14), the plough piece (16) is installed on the lower part of the cross rod (15), the screeding rod (17) is installed on the other side of the lower end of the stirring rod (14), the screeding plate (18) is installed on the lower part of the screeding rod (17), and the screeding plate (18) is obliquely arranged.

5. The sterilization apparatus for producing a jade ointment according to claim 4, further comprising a clamping block (19), wherein the clamping block (19) is arranged at the upper end of the stirring rod (14), and a clamping groove matched with the clamping block (19) is arranged at the lower end of the output shaft of the stirring motor (13).

6. The sterilization equipment for producing jade ointment according to claim 4, further comprising a sliding block (20), a sliding rod (21), a spring (22) and a lifting push rod (23), wherein a vertical sliding groove is formed in the lower portion of the stirring rod (14), the sliding block (20) is arranged at the inner end of the trowelling rod (17), the sliding rod (21) is arranged in the sliding groove of the stirring rod (14), the sliding block (20) is in sliding connection with the sliding rod (21), the lower end of the spring (22) is connected with the sliding block (20), the upper end of the spring (22) is connected with the top wall of the sliding groove of the stirring rod (14), the fixed end of the lifting push rod (23) is arranged at the bottom of a sterilization chamber of the sterilization box (1), and the piston rod of the lifting push rod (23) is connected with the chuck (2).

7. The sterilization equipment for producing the yuling paste according to claim 6, further comprising a roller (24), wherein the roller (24) is rotatably arranged at the outer end of the trowel (17), and the roller (24) is in rolling contact with the edge of the material tray (3).