CN110178933A - A kind of multiple-grooved pot of continuous carding machine - Google Patents

Abstract

The present invention relates to tea processing machine field, a kind of multiple-grooved pot of continuous carding machine, including pot frame, pot body, multiple buffer boards；Pot body is laterally made of side by side multiple U-lag plates, U frid both sides respectively connect a traction tube, U-lag plate includes preceding frid and drop end, U-lag plate front and back end and pot frame are relatively fixed, two sections of frid overlap joints, the traction tube are made of front and back two halves section traction tube, and front half section traction tube rear end, second half section traction tube front end and pot frame are affixed, two sections of traction tubes separate, and are not attached between the traction tube and pot frame on the right edge of the left margin and rightmost side U-lag plate of leftmost side U-lag plate, there are gaps；Arrange that buffer board, buffer board include fixed plate and connecting plate on the frid of front and back, fixed board ends and pot frame are relatively fixed, and movable plate top and fixed plate are relatively fixed, below can be with respect to pot frame longitudinally-moving, movable plate is affixed with traction tube.This invention removes all longitudinal constraints of multiple-grooved pot in the prior art, and multiple-grooved cookware is made to have excellent thermal deformation resistant.

Description

A kind of multiple-grooved pot of continuous carding machine

Technical field

The present invention relates to Tea Production equipment technical fields, and in particular to a kind of multiple-grooved pot of continuous carding machine.

Technical background

Continous way enzyme deactivating and strip sorting machine is widely used in bar shaped, in the processing of flat green tea, is mainly used for completing water-removing and reason The technique of item.In practical applications, there are mainly two types of effects for the machine, first is that being finished, manage bar synthetic job, second is that carrying out single Only manage bar operation, two kinds of operations are the difference is that the architectural difference of pot slot and the difference of temperature of boiler.

Existing carding machine multiple-grooved pot is usually made of pot frame, multiple U-lag plates and several spacing boards, and each U-lag plate is lateral It arranges and forms, be then formed, be fixed on the frame side of pot frame by the U-lag hole of spacing board.In application, multiple-grooved pot is usually pacified It sets on the swinging frame that can make traverse motion one, heating device is set below pot, tealeaves turns in slot inner edge and throws side Xiang Qianyi It is dynamic, until discharge bucket completes enzyme deactivating and strip sorting process.

From functional perspective, continuous carding machine multiple-grooved pot is necessarily in continuous movement and work shape heated for a long time State, which dictates that continuous carding machine multiple-grooved pot either which kind of structure, will solve two large problems --- 1. temperature distortions；2. connecting It connects firm.

In well known technology, spacing board is arranged in the bottom of U-lag plate, and spacing board is fixed with pot frame, traction tube and U-lag Plate and the fixation of pot frame are integral, and entire pot body is welded and fixed with pot frame, and entire multiple-grooved pot is a whole group welding piece, this Although technical solution ensure that the stable connection of multiple-grooved pot, but the disadvantage is that pot body expansion can cause to deform, and pot body goes out when heated Current situation portion is convex, recessed, or causes a pot frame deformation.The technology of the seperated pot of patent CN201410502494.3 application, utilizes fission Moveing freely to eliminate dilatancy between pot, this technology can eliminate to a certain extent the linear deformation of pot body, but be The stable connection of guarantee each point of pot body and pot frame, the right and left of each pot body will be fixedly connected with pot frame, but such Connection can fetter the longitudinal dilatation of pot body again, so the linear deformation of pot body can not be completely eliminated.

And in existing seperated pot technology, traction tube is also divided into multistage accordingly, in order to guarantee multistage pot body and pot The stable connection of frame needs that multistage crossbeam is arranged in pot frame, fixes each section of pot by the way that crossbeam and each section of traction tube are affixed Body, but crossbeam can fetter to the affixed of pot body and to a certain extent the longitudinal dilatation of pot body, and then weaken the heat resistanceheat resistant of seperated pot Morphotropism.

In short, the prior art is always accepted or rejected on the thermal deformation resistant of multiple-grooved pot and stable connection, can not accomplish satisfactory to both parties.

Summary of the invention

It is an object of the invention to completely eliminate the constraint being subject on the longitudinal direction of multiple-grooved pot, obtain a kind of with good resistance Shape has the multiple-grooved pot of good connection stability simultaneously.

In order to realize goal of the invention, a kind of multiple-grooved pot of continuous carding machine, including pot frame, pot body, multiple buffer boards；It is special Sign is that the pot body is laterally made of side by side multiple U-lag plates, and the both sides of U frid are respectively connected on a traction tube, described U-lag plate includes preceding frid and drop end, and preceding frid front end, drop end rear end and pot frame are relatively fixed, and preceding frid rear end is with after Frid front end overlap joint, the traction tube are made of former and later two half section traction tubes, the rear end of front half section traction tube and second half section The front end of traction tube and pot frame are affixed, and front half section traction tube is separated a distance with second half section traction tube, leftmost side U-lag plate The traction tube of left margin, the traction tube on the right edge of rightmost side U-lag plate is not attached between pot frame, there are gaps；

Buffer board is arranged with above preceding frid and drop end, the buffer board includes fixed plate and connecting plate, fixed board ends Relatively fixed with pot frame, the top of movable plate and fixed plate are relatively fixed, and movable plate below can be with respect to pot frame longitudinally-moving, activity Plate is fixed together with traction tube.

Buffer board has the advantages that

1. a pot frame is fixed together by buffer board and pot body, then affixed without pot body and the right and left of pot frame, this Connection type eliminates pot frame and fetters to the longitudinal direction of pot body.

2. due to buffer board connecting plate can opposite pot frame longitudinally-moving, so buffer board while fixed pot body not The longitudinal dilatation of pot body can be fettered.

It 3. buffer board is horizontally placed in pot frame, can effectively enhance the structural strength of pot frame, prevent a pot frame deformation.

Preferably, the buffer board be inverted U-shaped metal plate bending structure, the horizontal page both ends of inverted U-shaped metal plate bending structure with Pot frame is affixed, and the both ends of a perpendicular page and pot frame are affixed, the both ends activity of another perpendicular page；Traction tube is provided on the active page of buffer board The traction tube of card slot, the traction tube card slot and suit is affixed, is provided with traction tube card slot on affixed page, the traction tube card slot with Traction tube is only set with not affixed.(note: both ends and the affixed perpendicular page of pot frame are affixed page in inverted U-shaped metal plate bending structure, and both ends are living Dynamic perpendicular page is active page.The horizontal page and affixed page are the fixed plate of buffer board, and the active page is the company of buffer board Fishplate bar.)

Preferably, the traction tube card slot is greater than 1/2 arc gap.

Preferably, the buffer board active page bending angle is provided with short slot at both ends.

Using inverted U-shaped bending sheet metal structural as buffer board, when pot body longitudinal dilatation, the active page of buffer board can be sent out therewith Raw deformation, buffer board not but not fetter the longitudinal dilatation of pot body, can also convert active page shape for the expansion energy of pot body Become energy, plays the effect eliminated thermal expansion stress and weaken deformation impact.

Further, horizontal in the pot frame to have reinforcement bow plate, the reinforcement bow plate is inverted U-shaped metal plate bending structure, is opened There is traction tube card slot；The reinforcement bow plate is arranged in above U-lag plate lap-joint, and both ends are fixed on pot frame, reinforces bow plate Traction tube card slot and traction tube be set with without affixed；The two traction tube card slots that can be a reinforcement bow plate, which are set with, to be taken Connect two sections of traction tubes at place；It is also possible to two reinforcement bow plates to be respectively arranged in lap-joint two sides, reinforces bow close to lap-joint, one The traction tube card slot suit front half section traction tube of plate, another traction tube card slot suit second half section traction tube for reinforcing bow plate, two Reinforcement bow plate, which is combined, plays the role of fixed, limit, support to the frid of lap-joint.

Reinforce between bow plate and pot body, is connected by way of traction tube card slot and traction tube suit, it ensure that U-lag Plate is not bound by when thermal stretching, can effectively eliminate pot body Longitudinal Warping deformation.

Further, the multiple-grooved pot further includes charging deflector chute, discharging deflector chute, feeds deflector chute and discharging deflector chute It is arranged in the rear and front end of pot body.

Further, the multiple-grooved pot further includes spacing board, and U-shaped breach, cross sectional shape are offered on the spacing board It coincide with U-lag plate section, the spacing board is arranged in below lap-joint, is welded and fixed integrally with U-lag plate, is played connection And booster action, spacing board are not welded and fixed with pot frame, it is pot body lateral expansion reserved space that there are gaps to each other.

Preferably, the pot frame is rectangle structure, including pot frame front wallboard, pot frame rear wall plate, the left wallboard of pot frame, pot The right wallboard of frame, the pot frame rear wall plate are bending sheet metal structural, and the pot frame front wallboard, the left wallboard of pot frame, the right wallboard of pot frame are equal For rectangular steel pipe.

Preferably, the pot body is only laterally made of side by side U-lag plate 8-14 consistent in length, preceding frid rear end overlap joint On pit front edge of board, it is 20-50MM that lap-joint's length, which is overlapped length range,.

Preferably, the preceding frid front end is welded and fixed with pot frame front wallboard, wall behind the drop end rear end and pot frame Plate is welded and fixed, and front half section traction tube front end is welded and fixed with pot frame front wallboard, second half section traction tube rear end and pot Frame rear wall plate is welded and fixed.

Preferably, being disposed with buffer board 2-6 above the U-lag plate only, the buffer board is uniformly distributed in lap-joint Two sides, buffer board active page are that the perpendicular page of buffer board closer to lap-joint.

Preferably, the traction tube and the interval spot welding of U-lag plate, can dissolve U-lag board width to because of heat expansion in time And therefore the material stress generated is not in cydariform block.

Compared with prior art, maximum difference is that connection, the fixation, branch of pot body and pot frame are realized using buffer board to the present invention Support.Fission pot design in the prior art, traction tube and U-lag plate are segmentations, so having to by pot body left and right side It is affixed or add crossbeam and the affixed stable connection to guarantee each section of pot body and pot frame of each section of traction tube with pot frame.But these Connection type again can cause pot body while reinforcing stable connection additionally to fetter, and the longitudinal heat resistanceheat resistant for weakening multiple-grooved pot becomes Shape.And the present invention is guaranteeing stable connection by the connection for being arranged in the buffer board above pot body to realize pot frame and pot body Property under the premise of, eliminate all longitudinal constraints in the prior art, multiple-grooved pot longitudinal direction thermal deformation resistant allowed to reach best.And Since pot body and the left and right side of pot frame are affixed along being not necessarily to, then pot body and pot frame left and right side edge can be there are a fixed gaps, this guarantee Pot body lateral expansion not will receive a pot frame constraint, can further eliminate the transverse warping deformation of pot body.

The invention also provides the multiple-grooved pots of another continuous carding machine, which is characterized in that the pot body is by multiple U-shapeds Laterally composition, the both sides of U frid are respectively connected on a traction tube frid side by side, and the U-lag plate includes preceding frid and pit Plate, preceding frid rear end and pit front edge of board overlap, and the traction tube is made of former and later two half section traction tubes, front half section traction The rear end of pipe and the front end of second half section traction tube and pot frame are affixed, front half section traction tube and second half section traction tube separate one section away from The traction tube of traction tube, the right edge of rightmost side U-lag plate from, the left margin of leftmost side U-lag plate not phase between pot frame Even, there are gaps；

Buffer board is arranged with above preceding frid and drop end, the buffer board includes fixed plate and connecting plate, fixed board ends Relatively fixed with pot frame, the top of connecting plate and fixed plate are relatively fixed, and connecting plate can connect below with respect to pot frame longitudinally-moving Plate is fixed together with traction tube.

Above-mentioned technical proposal, compared to previous technical solution of the invention the difference is that, the preceding frid Rear end and the front end of drop end are not attached to pot frame, are seen on the whole, and entire pot body is suspended in pot frame by buffer board, pot frame Four Bian Junyu pot bodys are not attached to, and in pot body expanded by heating, pot frame two not will cause any constraint upwards in length and breadth to pot body, The technical program can eliminate the expansion torsional deformation of pot body to greatest extent.

Compared with prior art products, the invention has the advantages that pot body good integral strength, stable structure, heat resistanceheat resistant become Shape ability is good, and in length direction (longitudinal direction) and laterally, (width direction) will not all be deformed displacement to multiple-grooved pot, and U frid will not The deformation of unevenness for generating part, will not generate whole deformation up and down, these all ensure that pot slot in whole length direction The fluency of section consistency and pot slot guarantees tealeaves smooth flow in pot slot, and avoids the local temperature generated by deformation Unevenly, the water-removing quality of tealeaves is influenced.

Detailed description of the invention

Fig. 1 is a kind of multiple-grooved pot of continuous carding machine under technical solution of the present invention.

Fig. 2 is preceding frid drop end overlap joint schematic diagram.

Fig. 3 is that traction tube and U-lag plate weld schematic diagram.

Fig. 4 is to reinforce bow plate and traction tube assembling schematic diagram.

Fig. 5 is the structural schematic diagram of buffer board.

Fig. 6 is the partial enlarged view of region C in Fig. 5.

Fig. 7 is the enlarged drawing of Fig. 1 multiple-grooved pot regional area A.

Fig. 8 is the enlarged drawing of Fig. 1 multiple-grooved pot regional area B.

Fig. 9 is the attachment structure schematic diagram of buffer board active page and pot body.

Figure 10 is the enlarged drawing of regional area D in Fig. 9, shows the company of traction tube card slot and traction tube on buffer board active page Connect schematic diagram.

Figure 11 is the attachment structure schematic diagram of buffer board affixed page and pot body.

Figure 12 is the enlarged drawing of regional area E in Figure 11, shows traction tube card slot and traction on the affixed page of buffer board The connection schematic diagram of pipe.

Specific embodiment

It is a kind of multiple-grooved pot of continuous carding machine under technical solution of the present invention referring to Fig. 1.The multiple-grooved pot includes pot frame 1, pot body 2, buffer board 3, spacing board 4, reinforcement bow plate 5 and charging deflector chute 6 and discharging deflector chute 7.

The pot frame 1 includes by pot frame front wallboard 101, the left wallboard 102 of pot frame, the right wallboard 103 of pot frame, pot frame rear wall plate 104 rectangle structures being welded into.Pot frame front wallboard 101 is connected and fixed with charging deflector chute 6, pot frame rear wall plate 104 and discharging Deflector chute 7 is connected and fixed, and 104 structure of pot frame rear wall plate is metal plate bending, and bottom is disposed with discharge port 1041, discharge port 1041 Section is consistent with the section of U-lag plate 201, the left wallboard 102 of pot frame front wallboard 101, pot frame, the right wallboard 103 of pot frame structure be Rectangular steel pipe welding structure.

The pot body 2 is laterally made of side by side 12 U-lag plates 201, and traction tube is equipped between adjacent U-lag plate 201 202.The reinforcement bow cloth 5 is placed in 203 top of lap-joint, and the spacing board 4 is arranged in 203 lower section of lap-joint.Six buffer boards 3 201 top of U-lag plate is evenly arranged in along frid longitudinal (length direction).

Referring to Fig. 1 and Fig. 2, the U-lag plate 201 divides for preceding frid 2011 and drop end 2012, the preceding frid 2011 Identical as 2022 section of drop end, length is similar, and difference is, the preceding punching of frid 2011 has equally distributed small ventilating holes, described Preceding 2011 front end of frid is welded and fixed with pot frame front wallboard 101, and its rear end is overlapped on the front end of drop end 2012, the two overlapping Arrangement up and down, lap are lap-joint 203, and lap-joint's length is 20-50mm, behind the rear end of drop end 2012 and pot frame Wallboard 104 is welded and fixed.3 material of traction tube is round steel, is also divided into front half section traction tube 2021 accordingly and leads with the second half section Skirt 2022, frid 2011 and drop end 2012 before respectively corresponding, the front end of front half section traction tube 2021 and pot frame front wallboard 101 Be welded and fixed, rear end and the pot frame rear wall plate 104 of second half section traction tube 2022 are welded and fixed, front half section traction tube 2021 with it is later half Section traction tube 2022 is separated a distance in lap-joint 203.

It referring to Fig. 3, is connected by way of being spaced spot welding between traction tube 202 and U-lag plate 201, all U-lag plates 201 are fixed on traction tube 202 by the solder joint 501 of compartment distribution.

Referring to Fig. 1 and Fig. 4, reinforcing bow plate 5 is inverted U-shaped metal plate bending structure, is provided with leading greater than 1/2 arc gap thereon Skirt card slot 4 reinforces bow plate 5 and is arranged in lap-joint 203 among pot frame, front half section traction tube 2021 and second half section traction tube 2022 It is set in the traction tube card slot 4 on reinforcement bow 105 liang of perpendicular pages of plate, the reinforcement bow 5 both ends of plate are welded in the left wall of pot frame On plate 102 and the right wallboard 103 of pot frame.

Fig. 5 and Fig. 6 is participated in, the buffer board 3 is inverted U-shaped bending sheet metal structural, buffer board active page 301 and affixed page The traction tube card slot 4 greater than 1/2 arc gap is provided on 303, in the partial enlarged view of region C as it can be seen that in buffer board activity The both ends of 301 bending angles of page are provided with short slot 3011.

Referring to Fig. 1, Fig. 7 and Fig. 8, six buffer boards are uniformly distributed in above U-lag plate along frid length direction, and three slow Punching is above drop end 2012 on the left of lap-joint 203, and three buffer boards are on preceding frid 2011 on the right side of lap-joint 203 Side.

As it can be seen that being set to three buffer boards in 203 left side of lap-joint, affixed page in the local magnification region of region A 303 on the right side of itself, for close to a perpendicular page of lap-joint, active page 301 is one far from lap-joint in self structure in left side The both ends of perpendicular page, affixed page 303 and horizontal page 302 are fixedly welded on the left wallboard 103 of pot frame and the right wallboard 102 of pot frame, short slot 3011 are located at the bending angle both ends of active page 301.

As it can be seen that being located at three buffer boards on the right side of lap-joint, arranged direction is just in the local magnification region of region B On the contrary, the affixed page 303 of the buffer board is located at itself left side, it is proximate to a perpendicular page of lap-joint, active page 301 is on itself right side Side is the perpendicular page far from lap-joint, and the both ends of affixed page 303 and horizontal page 302 are fixedly welded on the left wallboard 103 of pot frame and pot frame On right wallboard 102, short slot 3031 is located at the bending angle both ends of active page 303.

Referring to Fig. 9 and Figure 10, the traction tube card slot 4 on traction tube 202 and buffer board active page 301 is on the basis of suit It is welded and fixed, is fixedly connected by solder joint 502.Referring to Figure 11 and Figure 12, traction tube 202 and leading on the affixed page 303 of buffer board 4 suits of skirt card slot are not welded and fixed.

The notch of U is offered on spacing board 4, cross sectional shape and 201 section of U-lag plate coincide, spacing board 4 and U-lag Plate 21 is welded and fixed integrally, and there are gaps between spacing board and the left wallboard 102 of pot frame and the right wallboard 103 of pot frame.

When multiple-grooved pot is heated, U-lag plate dilatancy, in the longitudinal direction, it is each for three buffer boards in 203 left side of lap-joint From active page 301 bend to the right, three on the right side of lap-joint buffer board, respective active page 301 is bent to the left, The thermal expansion stress that frid can be absorbed in the bending deformation of buffer board active page is converted to the mechanical elasticity stress of active deformation, delays Punching deformation absorbs energy, to eliminate the thermal expansion amount of frid, prevents frid from the local change such as bulge or distortion of arching upward occur Shape.Horizontally, spacing board 4 expands together with pot body, since spacing board 4 and the left wallboard 102 of pot frame, the right wallboard 103 of pot frame stay There is a gap, there are gap, the lateral expansion of pot body 2 will not be by for 2 left and right side of pot body and the left wallboard 102 of pot frame, the right wallboard 103 of pot frame It is fettered to pot frame, this eliminates the torsional deformation in pot body transverse direction.

Claims (10)

1. a kind of multiple-grooved pot of continuous carding machine, including pot frame, pot body, multiple buffer boards；It is characterized in that, the pot body is by more Laterally composition, the both sides of U frid are respectively connected on a traction tube side by side for a U-lag plate, the U-lag plate include preceding frid with Drop end, preceding frid front end, drop end rear end and pot frame are relatively fixed, and preceding frid rear end and pit front edge of board overlap, described to lead Skirt is made of former and later two half section traction tubes, and the rear end of front half section traction tube and the front end of second half section traction tube and pot frame are consolidated It connects, front half section traction tube is separated a distance with second half section traction tube, the traction tube of the left margin of leftmost side U-lag plate, most right The traction tube on the right edge of side U-lag plate is not attached between pot frame, there are gaps；

Buffer board is arranged with above preceding frid and drop end, the buffer board includes fixed plate and connecting plate, fixed board ends Relatively fixed with pot frame, the top of connecting plate and fixed plate are relatively fixed, and connecting plate can connect below with respect to pot frame longitudinally-moving Plate is fixed together with traction tube.

2. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that the buffer board is inverted U-shaped metal plate Golden bending structure, the horizontal page both ends of inverted U-shaped metal plate bending structure and pot frame are affixed, and the both ends of a perpendicular page and pot frame are affixed, another The both ends activity of perpendicular page；It is provided with traction tube card slot on the active page of buffer board, the traction tube of the traction tube card slot and suit is solid It connects, traction tube card slot is provided on affixed page, the traction tube card slot is only set with not affixed with traction tube；

The traction tube card slot is greater than 1/2 arc gap；The active page bending angle of the buffer board opens up short slot at both ends； The active page of each buffer board is that the perpendicular page of buffer board closer to lap-joint when installation.

3. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that horizontal in the pot frame to have reinforcement Bend plate, the reinforcement bow plate is inverted U-shaped metal plate bending structure, is provided with traction tube card slot thereon；The reinforcement bow plate is arranged in U-shaped Frid lap-joint, both ends are fixed on pot frame, and the traction tube card slot and traction tube for reinforcing bow plate are set with without affixed.

4. according to a kind of multiple-grooved pot of continuous carding machine described in claim 3, which is characterized in that a reinforcement bow plate arrangement In lap-joint, reinforcement bow plate two erects the traction tube card slot on page and is set with front and back two halves section traction tube；Or add described in two Strong bow plate is respectively arranged in lap-joint two sides, and close to lap-joint, a traction tube card slot for reinforcing bow plate is set with front half section traction tube, Another traction tube card slot for reinforcing bow plate is set with second half section traction tube.

5. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that the multiple-grooved pot further includes charging Deflector chute, discharging deflector chute, spacing board, charging deflector chute and the deflector chute that discharges are arranged in the rear and front end of pot body；It is described U-shaped breach is offered on spacing board, cross sectional shape and U-lag plate section coincide, and the spacing board is set to below lap-joint, It is welded and fixed integrally with U-lag plate, there are gaps between spacing board and pot frame, are not welded and fixed.

6. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that the pot frame is rectangle knot Structure, including pot frame front wallboard, pot frame rear wall plate, the left wallboard of pot frame, the right wallboard of pot frame, the pot frame rear wall plate are bending metal plate knot Structure, the pot frame front wallboard, the left wallboard of pot frame, the right wallboard of pot frame are rectangular steel pipe.

7. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that the pot body is by consistent in length Only laterally composition, the preceding frid rear end are overlapped on pit front edge of board U-lag plate 8-14 side by side, and lap-joint's length is overlapped Length range is 20-50MM.

8. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that the preceding frid front end and pot frame Front wallboard is welded and fixed, and the drop end rear end is welded and fixed with pot frame rear wall plate, front half section traction tube front end and pot frame Front wallboard is welded and fixed, and second half section traction tube rear end is welded and fixed with pot frame rear wall plate.

9. according to a kind of multiple-grooved pot of continuous carding machine described in claim 1, which is characterized in that be disposed with 2- above U-lag plate 6 buffer boards, the buffer board are uniformly distributed in lap-joint two sides.

10. the multiple-grooved pot of another continuous carding machine, including pot frame, pot body, multiple buffer boards；It is characterized in that, the pot body It is laterally made of side by side multiple U-lag plates, the both sides of U frid are respectively connected on a traction tube, and the U-lag plate includes preceding slot Plate and drop end, preceding frid rear end and pit front edge of board overlap, and the traction tube is made of former and later two half section traction tubes, preceding The rear end of half section of traction tube and the front end of second half section traction tube and pot frame are affixed, and front half section traction tube is separated with second half section traction tube A distance, the traction tube of the left margin of leftmost side U-lag plate, the right edge of rightmost side U-lag plate traction tube with pot frame Between be not attached to, there are gaps；

Buffer board is arranged with above preceding frid and drop end, the buffer board includes fixed plate and connecting plate, fixed board ends Relatively fixed with pot frame, the top of connecting plate and fixed plate are relatively fixed, and connecting plate can connect below with respect to pot frame longitudinally-moving Plate is fixed together with traction tube.