阅读说明：本技术 一种食用鸭脖食管气管清洁设备 (Edible duck neck esophagus and trachea cleaning equipment ) 是由 张彬 于 2020-07-02 设计创作，主要内容包括：一种食用鸭脖食管气管清洁设备,包括工作箱以及设置于所述工作箱中的工作腔,所述工作腔上臂固定设有清洗电动滑轨,所述清洗电动滑轨上滑动设有清洗伸缩杆,所述清洗伸缩杆的下端固定设有气压箱,将未清洗鸭脖放置于本发明中指定位置后,本发明能够自动对鸭脖进行清洗,同时去除鸭脖外侧的筋膜,清洗同时能定位鸭脖的食管与气管的位置,通过鸭脖的重量进行清洗鸭脖内的食管与气管的粗细更加干净的清洗,能全方位的清洗鸭脖,使人们吃到更干净的食品。(The edible duck neck esophagus and trachea cleaning equipment comprises a working box and a working cavity arranged in the working box, wherein a cleaning electric slide rail is fixedly arranged on the upper arm of the working cavity, a cleaning telescopic rod is slidably arranged on the cleaning electric slide rail, a pneumatic box is fixedly arranged at the lower end of the cleaning telescopic rod, and an unwashed duck neck is placed at a specified position in the cleaning equipment.)

1. The utility model provides an edible duck neck esophagus trachea cleaning device, includes the work box and set up in working chamber in the work box, its characterized in that: the upper arm of the working cavity is fixedly provided with a cleaning electric slide rail, the cleaning electric slide rail is slidably provided with a cleaning telescopic rod, the lower end of the cleaning telescopic rod is fixedly provided with an air pressure box, an air bag is fixedly arranged in the air pressure box, a slide groove is fixedly arranged on the air pressure box, a connecting rod is slidably arranged in the slide groove, a compression plate fixing block compression plate is fixedly arranged at the lower side of the connecting rod, the compression plate fixing block compression plate is slidably arranged at the upper side of the air bag, an inflation tube is fixedly arranged at the lower side of the air bag, a clamping box is fixedly arranged at the right side of the connecting rod, a transition box is fixedly arranged at the upper side of the clamping box, clamping cavities are symmetrically arranged at the left side and the right side of the clamping box, a clamping plate is slidably arranged in the clamping cavity, a clamping spring is, a cleaning cavity is arranged in the cleaning box, a cleaning motor is fixedly arranged on the left wall of the cleaning cavity, a driving gear is fixedly arranged on a motor shaft of the cleaning motor, a feeding connecting rod is rotatably arranged on the outer side of the driving gear, a feeding chute is fixedly arranged on the right wall of the cleaning cavity, a feeding rod is slidably arranged in the feeding chute, a feeding box is fixedly arranged on the feeding rod, a feeding positive block is fixedly arranged on the inner wall of the feeding box, a cleaning elastic rod is slidably arranged in the feeding positive block, a feeding reverse block is fixedly arranged on the outer side of the cleaning elastic rod and also plays a cleaning role, an inflation cavity is arranged in the cleaning elastic rod, a hook is fixedly arranged on the right side of the cleaning elastic rod, an air inlet is fixedly arranged on the upper side of the cleaning elastic rod, an inflation tube is fixedly arranged on the air inlet, and a driven gear, driven gear with the driving gear meshing transmission, driven gear's outside is rotated and is equipped with the washing connecting rod, wash fixed washing spout that is equipped with on the chamber left side wall, it is equipped with the washing pole to wash to slide in the spout, wash the pole with it rotates to wash the connecting rod and connects, it is equipped with the draw-in groove to wash the pole right-hand member fixed, the fixed water tank that is equipped with of working chamber roof, the fixed water pipe that is equipped with in water tank right side, it is fixed and is equipped with the water knockout drum to wash the fixed water knockout drum that is equipped with in case right side, the fixed distributive pipe that is equipped with on.

2. The edible duck neck esophagus and trachea cleaning device according to claim 1, wherein: an inlet is fixedly arranged on the upper wall of the working cavity, a funnel is fixedly arranged on the upper side of the inlet, a strong straight box is fixedly arranged on the lower side of the inlet, a strong straight cavity is arranged on the periphery of the strong straight box, a strong straight plate is arranged in the strong straight cavity in a sliding manner, a strong spring is arranged between the strong straight plate and the strong straight cavity, a strong straight belt supporting rod is fixedly arranged on the front side of the strong straight plate, a strong straight belt is fixedly arranged on the strong straight belt supporting rod, a tendon-removing leather box is fixedly arranged on the lower side of the strong straight box, the tendon-removing leather box is communicated with the strong straight cavity through a tendon mouth, a tendon-removing film cavity is arranged in the tendon-removing leather box, a support is fixedly arranged on the upper side in the tendon cavity, a bearing ring is slidably arranged on the support, a fixing ring is fixedly arranged on the upper side of the bearing ring, a fixing ring cavity, an expansion ball is fixedly arranged between the compression plate of the compression plate fixed block and the right wall of the fixed ring cavity, a stress block is fixedly arranged at the lower side of the bearing ring and is communicated with the expansion ball, the stress block is stressed to fill gas in the expansion ball to expand the expansion ball, a conveying belt is fixedly arranged at the bottom of the fascia cavity, a conveying base connecting rod is fixedly arranged on the conveying belt, a conveying base is fixedly arranged on the conveying base connecting rod, a duck neck is arranged in the conveying base, a base gear is fixedly arranged at the outer side of the conveying base, a bearing ring is arranged at the upper side of the conveying base, a fascia connecting rod is fixedly arranged on the bearing ring and is slidably arranged on the stress block, a fascia grinding plate is fixedly arranged on the rear wall of the fascia cavity, a rack is fixedly arranged on the rear wall of the fascia cavity and is in meshing transmission with the base gear, and a bracket box is fixedly arranged at the lower side of the conveying belt and at the bottom of the working cavity.

3. The edible duck neck esophagus and trachea cleaning device according to claim 1, wherein: the support right side the working chamber diapire is fixed and is equipped with the disc bracing piece, the disc bracing piece upside is fixed and is equipped with the disc motor, the fixed conversion disc that is equipped with on the motor shaft of disc motor, bilateral symmetry is equipped with the interface on the conversion disc.

4. The edible duck neck esophagus and trachea cleaning device according to claim 1, wherein: the disc support rod right side, the fixed lifting platform connecting rod that is equipped with on the low wall of working chamber, be equipped with the lifting chamber in the lifting platform connecting rod, the fixed lifting motor that is equipped with of lifting chamber back wall, the fixed cam that is equipped with on the motor shaft of lifting motor, the cam upside slides and is equipped with the lifting platform, the lifting platform slidable mounting is in the lifting platform connecting rod.

5. The edible duck neck esophagus and trachea cleaning device according to claim 1, wherein: and a cleaning completion box is fixedly arranged at the bottom of the working cavity.

Technical Field

The invention relates to the technical field of duck neck treatment, in particular to edible duck neck esophagus and trachea cleaning equipment.

Background

The duck neck is one of the famous foods in Hunan, Hubei, Sichuan and Jiangxi provinces. The sauced duck neck or the sauced duck neck is originated in the Shangting lake region facing Changde and Yueyang at the earliest, is originated in Hunan lake region and reaches Sichuan and Hubei through Hunan, is nationwide in recent years, has the effects of tonifying qi and tonifying deficiency, reducing blood fat, beautifying and the like, is fragrant, delicious and full in aftertaste, is leisure food suitable for people of all ages, but the duck neck is only cleaned on the outer surface of the duck neck by being generally baked, and as the duck is possibly eaten before death and has no complete swallowing of things harmful to human bodies, the esophagus is not clean, and dirt formed in respiratory tracts for a long time needs to be cleaned.

Disclosure of Invention

The invention aims to solve the technical problem of providing edible duck neck, esophagus and trachea cleaning equipment, and overcomes the problems.

The invention is realized by the following technical scheme.

The edible duck neck esophagus and trachea cleaning equipment comprises a working box and a working cavity arranged in the working box, wherein an electric cleaning sliding rail is fixedly arranged on the upper arm of the working cavity, an electric cleaning telescopic rod is slidably arranged on the electric cleaning sliding rail, an air pressure box is fixedly arranged at the lower end of the electric cleaning telescopic rod, an air bag is fixedly arranged in the air pressure box, a sliding chute is fixedly arranged on the air pressure box, a connecting rod is slidably arranged in the sliding chute, a pressed plate fixing block pressed plate is fixedly arranged on the lower side of the connecting rod, the pressed plate fixing block pressed plate is slidably arranged on the upper side of the air bag, an inflation tube is fixedly arranged on the lower side of the air bag, a clamping box is fixedly arranged on the right side of the connecting rod, a transition box is fixedly arranged on the upper side of the clamping box, clamping cavities are bilaterally and symmetrically arranged in the clamping cavities, a, a transition connecting rod is fixedly arranged on the upper side of the clamping plate, a cleaning box is fixedly arranged on the transition connecting rod, a cleaning cavity is arranged in the cleaning box, a cleaning motor is fixedly arranged on the left wall of the cleaning cavity, a driving gear is fixedly arranged on the motor shaft of the cleaning motor, a feeding connecting rod is rotatably arranged on the outer side of the driving gear, a feeding chute is fixedly arranged on the right wall of the cleaning cavity, a feeding rod is slidably arranged in the feeding chute, a feeding box is fixedly arranged on the feeding rod, a feeding positive block is fixedly arranged on the inner wall of the feeding box, a cleaning elastic rod is slidably arranged in the feeding positive block, a feeding reverse block is fixedly arranged on the outer side of the cleaning elastic rod and also has a cleaning function, an inflating cavity is arranged in the cleaning elastic rod, a hook is fixedly arranged on the right side of the cleaning elastic rod, an air inlet is fixedly arranged on the upper side of the, wash the chamber back wall and rotate and be equipped with driven gear, driven gear with the driving gear meshing transmission, driven gear's outside is rotated and is equipped with the washing connecting rod, wash the fixed washing spout that is equipped with on the chamber left side wall, it is equipped with the washing pole to wash to slide in the spout, wash the pole with it rotates to be connected to wash the connecting rod, it is equipped with the draw-in groove to wash the fixed pole right-hand member, the fixed water tank that is equipped with of working chamber roof, the fixed water pipe that is equipped with in water tank right side, wash the fixed water knockout drum that is equipped with in case right side, the fixed distributive pipe that is equipped with on the water knockout drum, distributive.

Further, an inlet is fixedly arranged on the upper wall of the working cavity, a funnel is fixedly arranged on the upper side of the inlet, a strong straight box is fixedly arranged on the lower side of the inlet, strong straight cavities are arranged around the strong straight box, a strong straight plate is slidably arranged in the strong straight cavity, a strong spring is arranged between the strong straight plate and the strong straight cavity, a strong straight belt supporting rod is fixedly arranged on the front side of the strong straight plate, a strong straight belt is fixedly arranged on the strong straight belt supporting rod, a tendon-removing leather box is fixedly arranged on the lower side of the strong straight box, the tendon-removing leather box is communicated with the strong straight cavity through a tendon mouth, a tendon-removing film cavity is arranged in the tendon leather box, a support is fixedly arranged on the upper side in the tendon cavity, a bearing ring is slidably arranged on the support, a fixing ring is fixedly arranged on the upper side of the bearing ring, a fixing ring cavity is arranged in the fixing ring, a fixed block pressed plate is arranged in the fixed chute in a sliding manner, an expansion ball is fixedly arranged between the pressed plate fixed block pressed plate and the right wall of the fixed ring cavity, a stressed block is fixedly arranged at the lower side of the bearing ring and is communicated with the expansion ball, the stressed block is stressed to fill gas in the expanded ball to expand the expansion ball, a conveying belt is fixedly arranged at the bottom of the fascia cavity, a conveying base connecting rod is fixedly arranged on the conveying belt, a conveying base is fixedly arranged on the conveying base connecting rod, a duck neck is arranged in the conveying base, a base gear is fixedly arranged at the outer side of the conveying base, the bearing ring is arranged at the upper side of the conveying base, a fascia connecting rod is fixedly arranged on the bearing ring and is slidably arranged on the stressed block, a grinding plate is fixedly arranged on the rear wall of the fascia cavity, and a rack is fixedly arranged on the rear wall of the fascia, the rack is in meshed transmission with the base gear, and a support box is fixedly arranged on the lower side of the conveying belt and at the bottom of the working cavity.

Further, a disc supporting rod is fixedly arranged on the right side of the support and on the bottom wall of the working cavity, a disc motor is fixedly arranged on the upper side of the disc supporting rod, a conversion disc is fixedly arranged on a motor shaft of the disc motor, and connectors are symmetrically arranged on the conversion disc in the left-right direction.

Further, a lifting table connecting rod is fixedly arranged on the right side of the disc supporting rod and the lower wall of the working cavity, a lifting cavity is arranged in the lifting table connecting rod, a lifting motor is fixedly arranged on the rear wall of the lifting cavity, a cam is fixedly arranged on a motor shaft of the lifting motor, a lifting table is arranged on the upper side of the cam in a sliding mode, and the lifting table is slidably arranged in the lifting table connecting rod.

Furthermore, a cleaning completion box is fixedly arranged at the bottom of the working cavity.

The invention has the beneficial effects that: after the uncleaned duck neck is placed at the designated position, the duck neck cleaning machine can automatically clean the duck neck, removes fascia on the outer side of the duck neck, can locate the positions of an esophagus and an trachea of the duck neck, cleans the esophagus and the trachea in the duck neck more cleanly by the weight of the duck neck, and can clean the duck neck in an all-around manner, so that people can eat cleaner food.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

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

FIG. 2 is a schematic top view of the structure of FIG. 1;

FIG. 3 is a schematic view of the structure at B in FIG. 1;

FIG. 4 is a schematic view of the structure of FIG. 3 at C;

FIG. 5 is a schematic view of the structure of FIG. 1 at D;

fig. 6 is a schematic view of the structure at a-a in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-6, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

With reference to the accompanying drawings 1-6, the edible duck neck esophagus trachea cleaning equipment comprises a working box 10 and a working chamber 84 arranged in the working box 10, wherein an upper arm of the working chamber 84 is fixedly provided with a cleaning electric slide rail 25, the cleaning electric slide rail 25 is slidably provided with a cleaning telescopic rod 47, a lower end of the cleaning telescopic rod 47 is fixedly provided with an air pressure box 48, an air bag 52 is fixedly arranged in the air pressure box 48, a slide groove 51 is fixedly arranged on the air pressure box 48, a connecting rod 49 is slidably arranged in the slide groove 51, a pressure plate fixed block 87 is fixedly arranged on the lower side of the connecting rod 49, the pressure plate fixed block compressed plate 87 is slidably arranged on the upper side of the air bag 52, an inflation tube 53 is fixedly arranged on the lower side of the air bag 52, a clamping box 55 is fixedly arranged on the right side of the connecting rod 49, a transition box 61 is fixedly arranged on the upper side of, a clamping plate 58 is arranged in the clamping cavity 57 in a sliding manner, a clamping spring 56 is arranged between the clamping plate 58 and the clamping cavity 57, a transition connecting rod 59 is fixedly arranged on the upper side of the clamping plate 58, a cleaning box 65 is fixedly arranged on the transition connecting rod 59, a cleaning cavity 78 is arranged in the cleaning box 65, a cleaning motor 66 is fixedly arranged on the left wall of the cleaning cavity 78, a driving gear 67 is fixedly arranged on a motor shaft of the cleaning motor 66, a feeding connecting rod 76 is rotatably arranged on the outer side of the driving gear 67, a feeding sliding groove 79 is fixedly arranged on the right wall of the cleaning cavity 78, a feeding rod 77 is arranged in the feeding sliding groove 79 in a sliding manner, a feeding box 81 is fixedly arranged on the feeding rod 77, a feeding positive block 94 is fixedly arranged on the inner wall of the feeding box 81, a cleaning elastic rod 63 is arranged in the feeding positive block 94 in a sliding manner, and a feeding reverse block, the feeding reverse block 82 also plays a cleaning role, an inflation cavity 83 is arranged in the cleaning elastic rod 63, a hook 74 is fixedly arranged on the right side of the cleaning elastic rod 63, an air inlet 73 is fixedly arranged on the upper side of the cleaning elastic rod 63, an inflation tube 53 is fixedly arranged on the air inlet 73, a driven gear 68 is arranged on the rear wall of the cleaning cavity 78 in a rotating mode, the driven gear 68 is in meshing transmission with the driving gear 67, a cleaning connecting rod 69 is arranged on the outer side of the driven gear 68 in a rotating mode, a cleaning sliding groove 72 is fixedly arranged on the left wall of the cleaning cavity 78, a cleaning rod 71 is arranged in the cleaning sliding groove 72 in a sliding mode, the cleaning rod 71 is connected with the cleaning connecting rod 69 in a rotating mode, a clamping groove 95 is fixedly arranged at the right end of the cleaning rod 71, a water tank 45 is fixedly arranged on the top wall of the working cavity 84, a, a water diversion pipe 75 is fixedly arranged on the water distributor 97, and the water diversion pipe 75 is communicated with the left cleaning box 65.

Beneficially, an inlet 12 is fixedly disposed on an upper wall of the working cavity 84, a funnel 11 is fixedly disposed on an upper side of the inlet 12, a strong straight box 13 is fixedly disposed on a lower side of the inlet 12, strong straight cavities 14 are disposed around the strong straight box 13, a strong straight plate 16 is slidably disposed in the strong straight cavities 14, a strong spring 15 is disposed between the strong straight plate 16 and the strong straight cavities 14, a strong belt support rod 17 is fixedly disposed on a front side of the strong straight plate 16, a strong straight belt 18 is fixedly disposed on the strong belt support rod 17, a tendon-removing leather box 21 is fixedly disposed on a lower side of the strong straight box 13, the tendon leather box 21 is communicated with the strong straight cavities 14 through a tendon leather opening 19, a tendon-removing cavity 85 is disposed in the tendon leather box 21, a support 54 is fixedly disposed on an inner upper side of the tendon film cavity 85, a bearing ring 31 is slidably disposed on the support 54, a fixing ring 88 is fixedly disposed on an upper side of the bearing ring 31, a fixing ring 93, fixed sliding grooves 92 are symmetrically arranged in the fixed ring cavity 93 up and down, a fixed block pressed plate 87 is arranged in the fixed sliding grooves 92 in a sliding manner, an expansion ball 91 is fixedly arranged between the pressed plate fixed block pressed plate 87 and the right wall of the fixed ring cavity 93, a stressed block 89 is fixedly arranged on the lower side of the bearing ring 31 and is communicated with the expansion ball 91, the stressed block 89 is stressed to fill gas in the expanded ball 91 to expand the expansion ball 91, a conveying belt 23 is fixedly arranged at the bottom of the fascia cavity 85, a conveying base connecting rod 26 is fixedly arranged on the conveying belt 23, a conveying base 27 is fixedly arranged on the conveying base connecting rod 26, a duck neck 29 is arranged in the conveying base 27, a base gear 28 is fixedly arranged on the outer side of the conveying base 27, a bearing ring 31 is arranged on the upper side of the conveying base 27, and a fascia connecting rod 86 is fixedly arranged on the bearing ring 31, the fascia connecting rod 86 is slidably mounted on the stress block 89, the fascia grinding plate 22 is fixedly arranged on the rear wall of the fascia cavity 85, the rack 24 is in meshing transmission with the base gear 28, and the bracket box 32 is fixedly arranged on the lower side of the conveying belt 23 and the bottom of the working cavity 84.

Beneficially, a disc support rod 37 is fixedly arranged on the right side of the bracket 54 and the bottom wall of the working cavity 84, a disc motor 36 is fixedly arranged on the upper side of the disc support rod 37, a conversion disc 35 is fixedly arranged on a motor shaft of the disc motor 36, and the conversion disc 35 is symmetrically provided with the connectors 34.

Beneficially, the right side of the disc supporting rod 37 and the lower wall of the working cavity 84 are fixedly provided with a lifting table connecting rod 38, a lifting cavity 39 is arranged in the lifting table connecting rod 38, a lifting motor 41 is fixedly arranged on the rear wall of the lifting cavity 39, a cam 43 is fixedly arranged on a motor shaft of the lifting motor 41, a lifting table 42 is arranged on the upper side of the cam 43 in a sliding mode, and the lifting table 42 is slidably arranged in the lifting table connecting rod 38.

Advantageously, a washing completion box 44 is fixedly arranged at the bottom of the working chamber 84.

The working steps are as follows: the duck neck 29 is put in the funnel 11, the duck neck 29 enters the strong straight cavity 14 through the inlet 12, the duck neck 29 straightens the bent duck neck 29 through the strong straight belt 18, the straightened duck neck enters the fascia cavity 85 through the fascia opening 19 and falls on the conveying base 27, the conveying base 27 is stressed to slightly move downwards, the conveying base 27 pulls the fascia connecting rod 86 downwards, the fascia connecting rod 86 drives the stress block 89, the stress block 89 is filled with air, the expansion ball 91 is inflated to outwards push the pressure plate fixed block pressure plate 87, the pressure plate fixed block pressure plate 87 clamps the upper end of the duck neck 29, the conveying belt 23 is started to convey the duck neck 29 rightwards, the base gear 28 is meshed with the rack 24 to drive the conveying base 27 to rotate, the conveying base 27 drives the duck neck 29 to rotate, the duck neck 29 rotates on the fascia grinding plate 22 to rub so as to move the fascia on the duck neck 29, the fixing ring 88 removes the fascia connecting rod 54 along the bracket, and the fascia connecting rod 86 is separated from the stress block 89 when the duck neck is on the right side, the duck neck 29 falls in the interface 34 in the conversion disc 35, the fascia connecting rod 86 continues to rotate along with the rack 24, when the duck neck rotates to the upper side of the bracket box 32, the fascia connecting rod 86 is in sliding combination with the stress block 89, the fascia connecting rod 86 takes up the stress block 89 to continue to move, the disc motor 36 is started to drive the conversion disc 35 to rotate, the conversion disc 35 drives the duck neck 29 to rotate to the upper side of the lifting table connecting rod 38 and the lower side of the clamping box 55, the lifting motor 41 is started, the lifting motor 41 drives the cam 43 to rotate the cam 43 to jack the lifting table 42, the lifting table 42 lifts the duck neck 29 into the clamping cavity 57, the fixing ring 88 falls into the working cavity 84, the duck neck 29 extrudes the clamping plate 58, the clamping plate 58 drives the transition connecting rod 59 to move towards two sides, the transition connecting rod 59 drives the cleaning box 65 to move towards two sides to enable the cleaning elastic rod 63 to be aligned with the esophagus and the trachea, and the clamping box 55 is subjected to, the clamping box 55 drives the connecting rod 49 to move downwards, the connecting rod 49 drives the pressure plate 87 for fixing the pressure plate to extrude the air bag 52, the air in the air bag 52 is pressed into the inflation cavity 83 through the inflation tube 53, the inflation cavity 83 with large weight becomes thicker, the duck neck esophagus and trachea with large mass are also thicker, the cleaning motor 66 is started to drive the driving gear 67 to rotate, the driving gear 67 drives the driven gear 68 to rotate, the driven gear 68 drives the cleaning rod 71 to slide in the cleaning chute 72 through the cleaning connecting rod 69, the driving gear 67 drives the feeding rod 77 to slide in the feeding chute 79 through the feeding connecting rod 76, the feeding positive block 94 in the feeding box 81 pushes the cleaning elastic rod 63 downwards, the feeding box 81 moves upwards and cannot drive the cleaning elastic rod 63 to move upwards, when the hook 74 is clamped into the clamping groove 95, the cleaning rod 71 drives the cleaning elastic rod 63 to reciprocate, and the cleaning esophagus is cleaned, Trachea, during water in the water tank 45 can flow into washing case 65 through water pipe 46, flows into duck neck 29 from washing case 65, washs along with wasing elastic rod 63 together, washs the electronic slide rail 25 start-up after the washing is accomplished and drives and wash telescopic link 47 and enjoy the motion, puts into the duck neck 29 that washs and accomplishes the case 44 with wasing.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.