CN113799178B

CN113799178B - Rice cake shredding equipment with adjustable width

Info

Publication number: CN113799178B
Application number: CN202110624944.6A
Authority: CN
Inventors: 许福军; 牛海渊; 黄初升
Original assignee: Guangzhou Porui Electric Appliance Co ltd
Current assignee: Guangzhou Porui Electric Appliance Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2023-04-18
Anticipated expiration: 2041-06-04
Also published as: CN113799178A

Abstract

The invention discloses a rice cake shredding device with adjustable width, which comprises a conveying belt, wherein a blade capable of vibrating up and down is arranged at the top of the conveying belt, vibrating rods are fixed at two ends of the blade, an inverted L-shaped support is arranged on the vibrating rods, a clearing device for removing rice cake wires cut on the conveying belt and rice cake wires left on the blade is arranged at the front end of the blade, a limiting device for limiting rice cakes is arranged at one end, away from the clearing device, of the blade, the rice cakes are shredded by the blade vibrating up and down, the width of the rice cake shredding can be changed by changing the vibration frequency of the blade, the clearing device is additionally arranged at the front end of the blade, the clearing device timely removes and stores the rice cake wires cut on the conveying belt and the rice cake wires left on the blade, the limiting device is additionally arranged at one end, away from the clearing device, and can centralize rice cake blocks on the conveying belt, so that the cutting quality of the rice cake wires cut by the blade is improved.

Description

Rice cake shredding equipment with adjustable width

Technical Field

The invention relates to the technical field of rice cake shredding, in particular to rice cake shredding equipment with adjustable width.

Background

The rice cake is a traditional food of Chinese nationality, is a cake steamed by glutinous rice or rice flour with large viscosity, is studied to eat in spring festival and in many areas of China, but the rice cake becomes sticky and hard after being processed into a whole, wastes time and labor when being cut, is produced along with the development of mechanization degree, particularly along with the rise of mechanical cooking tools, and a cake cutting machine is also produced, is widely applied to rice cake processing factories, restaurants and the like, and effectively saves manpower.

Because the rice cakes are sticky, a small amount of rice cake shreds are stuck to the bottom or the side of the blade after one piece of rice cake is cut in the shredding process of the rice cake machine, the rice cake shreds are stacked on the blade, the cutting precision and effect of the subsequent rice cakes are influenced, and the rice cakes are not necessarily placed on the conveyor belt to be parallel to the blade, so that the rice cake cutting is inclined, and the attractiveness of the rice cake shred cutting is influenced. To this end, we propose a rice cake shredding device with adjustable width.

Disclosure of Invention

The invention aims to provide rice cake shredding equipment with adjustable width for removing rice cake limiting and rice cake wires adhered to blades, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the top of the conveying belt is provided with a blade capable of vibrating up and down, two ends of the blade are respectively fixed with a vibrating rod, an inverted L-shaped support is arranged on the vibrating rods, the width of the rice cake shredding can be changed by changing the vibration frequency of the blade, a clearing device used for removing rice cake wires cut on the conveying belt and rice cake wires remained on the blade is arranged at the front end of the blade, the clearing device timely removes and stores the rice cake wires cut on the conveying belt and the rice cake wires remained on the blade, a limiting device used for limiting the rice cakes is arranged at one end, away from the clearing device, of the blade, and the limiting device can centralize and smooth rice cake blocks on the conveying belt, so that the cutting quality of the rice cake wires cut by the blade is improved.

Preferably, the cleaning device comprises a scraper, on one hand, the scraper removes the rice cake wires cut on the conveyor belt, on the other hand, the scraper can remove the rice cake wires adhered to the blade while scraping, so as to prevent the rice cake wires remained on the blade from influencing the cutting effect of subsequent rice cakes, a moving rod is fixed at one end of the scraper, a pushing device for pushing the moving rod back and forth is arranged at one end of the moving rod away from the scraper, the pushing device pushes the moving rod back and forth, so that the scraper can return to the starting point after removing a piece of rice cake wire to remove the next rice cake wire, a connecting plate penetrates through the moving rod, and one end of the connecting plate is fixed on the inverted-L-shaped support.

Preferably, thrust unit includes first pivot, the bearing is connected with the cam on the first pivot, the surface roll connection of cam has the gyro wheel, the inside of gyro wheel is fixed with the minor axis, be fixed with the mounting panel between the both ends of minor axis, the one end and the carriage release lever that the gyro wheel was kept away from to the mounting panel are fixed, be connected with first spring between mounting panel and the even board, first spring housing is established on the carriage release lever, and when first pivot rotated, the cam rotated, and the gyro wheel rolled on cam surface, because the shape of cam surface different places is different, made the gyro wheel promote the carriage release lever round trip movement to make scraper blade round trip movement.

Preferably, a first gear is connected to the first rotating shaft through a bearing, a rotating wheel is intermittently meshed to the first gear, an arc gear groove meshed to the first gear is formed in the rotating wheel, the arc gear groove is intermittently meshed to the first gear, the first gear can intermittently rotate, so that a scraper intermittently reciprocates to scrape on a conveyor belt, the rice cake wire is removed after the cutting of a rice cake is finished, the residual rice cake wire on the conveyor belt is prevented from being moved to the ground by the scraper in the process of returning to the starting point by the scraper, a second rotating shaft is arranged in the rotating wheel, an L-shaped plate is commonly connected between the first rotating shaft and the second rotating shaft, one end of the L-shaped plate is fixed on an inverted L-shaped support, a second gear is connected to a second rotating shaft through a bearing at the end, far away from the rotating wheel, and a third gear is meshed to the second gear through a chain, the inner bearing of the third gear is connected with a third rotating shaft, one end of the third rotating shaft far away from the third gear is connected with a fourth gear through a bearing, a worm is meshed on the fourth gear, one end of the worm is connected with a fifth gear through a bearing, one end of the fifth gear is meshed with a sixth gear, the sixth gear is connected to the output end of the conveying belt through a bearing, the sixth gear rotates along with the transmission of the conveying belt so as to drive the fifth gear meshed with the sixth gear to rotate, the fifth gear rotates, the worm rotates, the fourth gear meshed with the worm rotates, the fourth gear rotates to enable the third gear to rotate, the second gear connected through a chain rotates, the second gear rotates to enable the rotating wheel to rotate, the rotating wheel rotates to enable the arc-shaped gear groove to be intermittently meshed with the first gear, so as to enable the first gear to intermittently rotate, connecting seats are arranged at two ends of the worm, a first long plate is fixed between the connecting seats, a second long plate is fixed at the bottom of the connecting seat, close to one end of the conveying belt, of the worm, and one end of the second long plate is fixed on the inverted L-shaped support.

Preferably, one side of the conveying belt, which is far away from the pushing device, is provided with an arc-shaped baffle, one end of the arc-shaped baffle is fixed on the inverted L-shaped support, and the bottom of the arc-shaped baffle is provided with a storage box.

Preferably, stop device includes two sets of relative motion's limiting plate, the limiting plate is established at the both ends of conveyer belt separately, and the limiting plate is continuous to be close to each other and keep away from to the messenger places the rice cake between the limiting plate and puts up gradually, the inside of limiting plate all is fixed with the connecting rod, the equal sliding connection in both ends of connecting rod has the spout, all be fixed with the fixed plate between the spout at connecting rod both ends, the one end of fixed plate is all fixed on the support that appears falling L, and the connecting rod slides inside the spout, thereby makes the stable removal in the conveyer belt top of limiting plate.

Preferably, the top middle part of limiting plate all is fixed with the movable plate, threaded connection has the lead screw between the movable plate, be equipped with on the lead screw two sets of respectively with two sets of movable plate threaded connection's the opposite screw thread of turning round, the one end of lead screw is passed the fixed plate and is fixed with the bull stick, the one end that the lead screw was kept away from to the bull stick is fixed with meets and hinders bounce-back motor, meets and hinders bounce-back motor and can change the rotation direction after the limiting plate at both ends bumps the rice cake to make the continuous positive and negative rotation of lead screw, when the lead screw rotated, two sets of limiting plates of threaded connection on the lead screw constantly kept away from each other and were close to, meet and hinder and be equipped with the supporting seat on the bounce-back motor, the one end of supporting seat is fixed on the shape support of falling L.

Preferably, the two sides of one end, close to the fixed plate, of the limiting plate are both fixed with a sliding rod, one end, far away from the limiting plate, of the sliding rod penetrates through the fixed plate, a second spring is connected between the fixed plate and the limiting plate in a connecting mode, the second spring is sleeved on the sliding rod, when the limiting plates at the two ends of the rice cake touch the rice cake, the rice cake generates elastic force on the limiting plate under the effect of the second spring, the rotation direction of the bounce motor is changed when the rice cake is blocked, therefore the two limiting plates are far away from each other, and the rice cake is gradually righted in the continuous process of being close to and far away from the limiting plates.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the rice cake is shredded by the vertically vibrating blade, the shredding width of the rice cake can be changed by changing the vibration frequency of the blade, the cleaning device is additionally arranged at the front end of the blade, the cleaning device timely removes and stores the rice cake shreds cut on the conveying belt and the rice cake shreds remained on the blade, the limiting device is additionally arranged at one end of the blade far away from the cleaning device, and the limiting device can be used for righting and smoothening rice cake blocks on the conveying belt, so that the cutting quality of the rice cake shreds cut by the blade is improved.

Drawings

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

FIG. 2 is a schematic view of the cleaning apparatus according to the present invention;

FIG. 3 is an enlarged view of area A of FIG. 2;

FIG. 4 is an enlarged view of area B of FIG. 2;

FIG. 5 is an enlarged view of area C of FIG. 2;

FIG. 6 is a schematic structural view of the present invention as viewed from the bottom of the conveyor belt;

FIG. 7 is a schematic view of the structure of the position limiting device of the present invention;

FIG. 8 is a schematic diagram of a limiting plate according to the present invention;

in the figure: 1-a conveyor belt; 2-a blade; 3-a vibrating rod; 4-an inverted L-shaped bracket; 5-a clearing device; 6-a limiting device; 7-a scraper; 8-a moving rod; 9-connecting plates; 10-a first shaft; 11-a cam; 12-a roller; 13-minor axis; 14-a mounting plate; 15-a first spring; 16-a first gear; 17-a runner; 18-arc gear groove; 19-a second shaft; 20-a second gear; 21-a third gear; 22-a third shaft; 23-a fourth gear; 24-a worm; 25-fifth gear; 26-sixth gear; 27-a connecting seat; 28-a first elongated panel; 29-a second long plate; 30-L-shaped plate; 31-a curved baffle; 32-a storage box; 33-a limiting plate; 34-a connecting rod; 35-a chute; 36-a fixed plate; 37-moving the plate; 38-a screw rod; 39-threads; 40-rotating rod; 41-bounce motor when meeting resistance; 42-a support base; 43-a slide bar; 44-a second spring; 45-pushing device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 8, the present invention provides a technical solution of a rice cake shredding device with adjustable width: a rice cake shredding device with adjustable width comprises a conveying belt 1, wherein a blade 2 capable of vibrating up and down is arranged at the top of the conveying belt 1, vibrating rods 3 are fixed at two ends of the blade 2, inverted L-shaped supports 4 are arranged on the vibrating rods 3, the width of the rice cake shredding can be changed by changing the vibration frequency of the blade 2, a clearing device 5 used for removing rice cake wires cut on the conveying belt 1 and rice cake wires remained on the blade 2 is arranged at the front end of the blade 2, the clearing device 5 timely removes and stores the rice cake wires cut on the conveying belt 1 and the rice cake wires remained on the blade 2, an arc-shaped baffle plate 31 is arranged on one side, away from the clearing device 5, of the conveying belt 1, one end of the arc-shaped baffle plate 31 is fixed on the inverted L-shaped supports 4, a storage box 32 is arranged at the bottom of the arc-shaped baffle plate 31, a limiting device 6 used for limiting rice cakes is arranged at one end, away from the clearing device 5, of the blade 2, and the limiting device 6 can straighten rice cake blocks on the conveying belt 1 evenly to improve the cutting quality of the rice cake wires cut by the blade 2.

The cleaning device 5 comprises a scraper 7, the scraper 7 removes the rice cake wires cut on the conveyer belt 1 on one hand, and on the other hand, the sticky rice cake wires on the blade 2 can be removed while the scraper 7 scrapes, so that the rice cake wires remained on the blade 2 are prevented from influencing the cutting effect of subsequent rice cakes, a moving rod 8 is fixed at one end of the scraper 7, a pushing device 45 for pushing the moving rod 8 in a reciprocating manner is arranged at one end of the moving rod 8 far away from the scraper 7, the pushing device 45 pushes the moving rod 8 in a reciprocating manner, so that the scraper 7 can return to the starting point after removing one piece of rice cake wire to remove the next rice cake wire, a connecting plate 9 penetrates through the moving rod 8, and one end of the connecting plate 9 is fixed on the inverted L-shaped bracket 4.

Thrust unit 45 includes first pivot 10, bearing connection has cam 11 in first pivot 10, the surface roll connection of cam 11 has gyro wheel 12, the inside of gyro wheel 12 is fixed with minor axis 13, be fixed with mounting panel 14 between the both ends of minor axis 13, mounting panel 14 is kept away from the one end and the carriage release lever 8 of gyro wheel 12 and is fixed, mounting panel 14 and even be connected with first spring 15 between the board 9, first spring 15 cover is established on carriage release lever 8, and when first pivot 10 rotated, cam 11 rotated, and gyro wheel 12 rolled on cam 11 surface, because the shape in the different places in cam 11 surface is different, made gyro wheel 12 promote 8 round trip movements of carriage release lever when cam 11 rotated to make scraper blade 7 round trip movements.

A first gear 16 is in bearing connection with the first rotating shaft 10, a rotating wheel 17 is intermittently meshed with the first gear 16, an arc gear groove 18 meshed with the first gear 16 is arranged on the rotating wheel 17, the arc gear groove 18 is intermittently meshed with the first gear 16, the first gear 16 can intermittently rotate, so that the scraper 7 intermittently reciprocates to scrape off the conveyor belt 1, the rice cake wires are removed after the cutting of a piece of rice cake is finished, the residual rice cake wires on the conveyor belt 1 are prevented from being moved to the ground by the scraper 7 in the process of returning to the starting point by the scraper 7, a second rotating shaft 19 is arranged inside the rotating wheel 17, an L-shaped plate 30 is commonly connected between the first rotating shaft 10 and the second rotating shaft 19, one end of the L-shaped plate 30 is fixed on the inverted L-shaped bracket 4, and one end of the second rotating shaft 19 far away from the rotating wheel 17 is in bearing connection with a second gear 20, a third gear 21 is meshed with the second gear 20 through a chain, a third rotating shaft 22 is connected to the inner bearing of the third gear 21, a fourth gear 23 is connected to one end, far away from the third gear 21, of the third rotating shaft 22, a worm 24 is meshed with the fourth gear 23, one end of the worm 24 is connected with a fifth gear 25 through a bearing, one end of the fifth gear 25 is meshed with a sixth gear 26, the sixth gear 26 is connected to the output end of the conveyor belt 1 through a bearing, the sixth gear 26 rotates along with the transmission of the conveyor belt 1, so that the fifth gear 25 meshed with the sixth gear is driven to rotate, the fifth gear 25 rotates, the worm 24 rotates, the fourth gear 23 meshed with the worm 24 rotates, the third gear 21 rotates, the second gear 20 connected through the chain rotates, the second gear 20 rotates, and the rotating wheel 17 rotates, the rotating wheel 17 rotates to enable the arc-shaped gear groove 18 on the rotating wheel 17 to be intermittently meshed with the first gear 16, so that the first gear 16 intermittently rotates, connecting seats 27 are arranged at two ends of the worm 24, a first long plate 28 is fixed between the connecting seats 27, a second long plate 29 is fixed at the bottom of the worm 24 close to the connecting seats 27 at one end of the conveying belt 1, and one end of the second long plate 29 is fixed on the inverted L-shaped support 4.

Stop device 6 includes two sets of relative motion's limiting plate 33, the limiting plate 33 is established at the both ends of conveyer belt 1 respectively, and the limiting plate 33 is continuous to be close to each other and keep away from to the messenger places the rice cake between limiting plate 33 and sets up gradually, the inside of limiting plate 33 all is fixed with connecting rod 34, the equal sliding connection in both ends of connecting rod 34 has spout 35, all be fixed with fixed plate 36 between the spout 35 at connecting rod 34 both ends, the one end of fixed plate 36 is all fixed on falling L shape support 4, and connecting rod 34 slides in spout 35 is inside, thereby makes the stable top at conveyer belt 1 of limiting plate 33 remove.

The movable plates 37 are fixed in the middle of the top ends of the limiting plates 33, screw rods 38 are connected between the movable plates 37 in a threaded manner, two sets of threads 39 which are connected with the two sets of movable plates 37 in a threaded manner and have opposite rotation directions are arranged on the screw rods 38, a rotating rod 40 is fixed at one end of each screw rod 38 after penetrating through the fixed plate 36, a resistance rebound motor 41 is fixed at one end of each rotating rod 40 far away from the screw rod 38, slide rods 43 are fixed at two sides of one end of each limiting plate 33 close to the fixed plate 36, one end of each slide rod 43 far away from the limiting plate 33 penetrates through the fixed plate 36, a second spring 44 is connected between the fixed plate 36 and the limiting plate 33 in a trained manner, the second spring 44 is sleeved on the slide rods 43, when the limiting plates 33 at two ends of the rice cake touch the rice cake, the spring 44 generates elasticity on the limiting plates 33 to promote the resistance rebound motor 41 to change the rotation direction, so that the screw rods 38 continuously rotate forward and backward, when the screw rods 38 rotate, the two sets of the limiting plates 33 connected to the screw rods 38 are continuously far away from and close to the rice cake, the support 4, the resistance rebound motor 41 is arranged on the support 42, and the support 4 is fixed at one end of the support.

In the scheme, the rice cakes are put on the conveyer belt 1 one by one, the rice cakes gradually enter the limiting devices 6 in the conveying process of the conveyer belt 1, the limiting plates 33 at two ends of the rice cakes gradually stop the rice cakes when the rice cakes are touched, under the action of the second spring 44, the rice cake generates elasticity on the limit plates 33, so that the rebounding motor 41 is prompted to change the rotating direction when meeting resistance, the screw rod 38 continuously rotates forwards and backwards, when the screw rod 38 rotates, the two groups of limit plates 33 which are in threaded connection with the screw rod 38 are continuously far away from and close to each other, in the process of continuously approaching and departing, the rice cake is gradually righted, the righted rice cake enters the lower part of the blade 2, the blade 2 continuously vibrates up and down, so as to shred the rice cake, and the width of the shredded rice cake can be changed by changing the vibration frequency of the blade 2, the sixth gear 26 rotates in the conveying process of the conveyer belt 1, thereby causing the fifth gear 25 engaged therewith to rotate, the fifth gear 25 to rotate, the worm 24 to rotate, thereby rotating the fourth gear 23 engaged on the worm 24, the fourth gear 23, the third gear 21, so that the second gear 20 connected by the chain rotates, the second gear 20 rotates, the runner 17 rotates, the arc-shaped gear groove 18 on the runner 17 intermittently meshes with the first gear 16, so that the first gear 16 intermittently rotates, so that the cam 11 thereon intermittently contacts with the roller 12, the roller 12 rolls on the surface of the cam 11, due to the different shapes of different positions on the surface of the cam 11, the cam 11 rotates to enable the roller 12 to push the moving rod 8 to move back and forth, thereby, the scraper 7 intermittently moves back and forth, and the scraper 7 moves the rice cake strings cut on the conveyor belt 1 and the rice cake strings remaining on the blade 2 into the storage box 32.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a width adjustable rice cake shreds equipment which characterized in that: the method comprises the following steps:

a conveyor belt (1);

the top of conveyer belt (1) is equipped with blade (2) that can vibrate from top to bottom, the both ends of blade (2) all are fixed with vibrating arm (3), be equipped with on vibrating arm (3) down L shape support (4), the front end of blade (2) is equipped with and is used for carrying out the clearing device (5) of getting rid of to remaining rice cake silk on the rice cake silk that the conveyer belt (1) was gone up with blade (2), the one end that clearing device (5) was kept away from in blade (2) is equipped with stop device (6) spacing to the rice cake, clearing device (5) include scraper blade (7), the one end of scraper blade (7) is fixed with carriage release lever (8), the one end that scraper blade (7) were kept away from in carriage release lever (8) is equipped with thrust unit (45) that are used for reciprocating promotion with carriage release lever (8), it has link board (9) to pass on carriage release lever (8), the one end of link board (9) is fixed on L shape support (4) down, thrust unit (45) include first pivot (10), first pivot (10) upper bearing (11) be connected with minor axis (12) fixed mounting panel (12), there is connected with between the minor axis (12) the gyro wheel (13), the utility model discloses a gear shift mechanism, including mounting panel (14), gyro wheel (12) are kept away from in mounting panel (14) and removal rod (8) are fixed, be connected with first spring (15) between mounting panel (14) and link board (9), first spring (15) cover is established on removal rod (8), bearing connection has first gear (16) in first pivot (10), intermittent type nature meshing has runner (17) on first gear (16), be equipped with arc gear groove (18) with first gear (16) meshing on runner (17), the inside of runner (17) is equipped with second pivot (19), be connected with L shaped plate (30) between first pivot (10) and second pivot (19) jointly, the one end of L shaped plate (30) is fixed on L shape support (4) that falls, the one end bearing that runner (17) were kept away from in second pivot (19) is connected with second gear (20), there is third gear (21) through the chain meshing in second gear (20), the inside bearing of third gear (21) is connected with third pivot (22), the one end bearing (22) of third pivot (22) is kept away from in fourth gear bearing (23) is connected with fourth gear bearing (24), worm bearing (24) have fourth gear (24), the one end meshing of fifth gear (25) has sixth gear (26), sixth gear (26) bearing connection is on the output of conveyer belt (1), the both ends of worm (24) all are equipped with connecting seat (27), be fixed with first long slab (28) between connecting seat (27), the bottom that worm (24) are close to connecting seat (27) of conveyer belt (1) one end is fixed with second long slab (29), the one end of second long slab (29) is fixed on falling L shape support (4), one side that thrust unit (45) was kept away from in conveyer belt (1) is equipped with cowl (31), the one end of cowl (31) is fixed on falling L shape support (4), cowl (31)'s bottom is equipped with deposits case (32), stop device (6) are including two sets of relative motion's limiting plate (33), limiting plate (33) divide and establish at the both ends of conveyer belt (1), the inside of limiting plate (33) all is fixed with connecting rod (34), the both ends of connecting rod (34) all are connected with the fixed sliding chute (35), the both ends of connecting rod (35) are all fixed sliding chute (35) and the middle part of spout (36) is fixed at the top (36), all there is fixed board (36) on the limiting plate (36), threaded connection has lead screw (38) between movable plate (37), be equipped with on lead screw (38) two sets of respectively with two sets of movable plate (37) threaded connection revolve to opposite screw thread (39), the one end of lead screw (38) is passed fixed plate (36) and is fixed with bull stick (40), the one end that lead screw (38) were kept away from in bull stick (40) is fixed with meets and hinders bounce-back motor (41), be equipped with supporting seat (42) on meeting and hindering bounce-back motor (41), the one end of supporting seat (42) is fixed on falling L shape support (4).

2. The rice cake shredding device with the adjustable width as claimed in claim 1, wherein: the limiting plate (33) is close to the one end both sides of fixed plate (36) and all is fixed with slide bar (43), fixed plate (36) are all passed to the one end that limiting plate (33) were kept away from in slide bar (43), it has connect second spring (44) to practice between fixed plate (36) and limiting plate (33), second spring (44) cover is established on slide bar (43).