阅读说明：本技术 一种板簧热弯成型机组及热弯成型工艺 (Plate spring hot bending forming unit and hot bending forming process ) 是由 梁起彰 马建伟 于 2020-06-20 设计创作，主要内容包括：本发明涉及板簧加工设备及工艺技术领域,具体公开了一种板簧热弯成型机组及弯曲成型工艺,该设备组包括加热炉、弯曲成型机和衔接装置,该工艺包括：S1、将待弯曲的钢板放置在可转向传送装置上,通过加热炉进行加热,加热时,可转向传送装置带动钢板在炉体的预热区内停留10-60s,对钢板进行预热,之后继续传送至炉体内进行加热；S2、对加热后的钢板,通过衔接装置转运到弯曲成型机内进行弯曲。本发明的有益效果为：弯曲后钢板具有性能一致性,其组成的板簧性能也更稳定,而且同时加工多个钢板,提高了生产效率,还节能环保。(The invention relates to the technical field of plate spring processing equipment and technology, and particularly discloses a plate spring hot bending forming unit and a bending forming technology, wherein the equipment comprises a heating furnace, a bending forming machine and a connecting device, and the technology comprises the following steps: s1, placing the steel plate to be bent on the turnable conveying device, heating the steel plate by the heating furnace, wherein the turnable conveying device drives the steel plate to stay in a preheating zone of the furnace body for 10-60S during heating, preheating the steel plate, and then continuously conveying the steel plate into the furnace body for heating; and S2, transferring the heated steel plate into a bending forming machine through a connecting device to be bent. The invention has the beneficial effects that: the bent steel plates have performance consistency, the performance of the plate spring formed by the bent steel plates is more stable, and a plurality of steel plates are processed simultaneously, so that the production efficiency is improved, and the bent steel plates are energy-saving and environment-friendly.)

1. A plate spring hot bending forming unit is characterized by comprising a heating furnace, a bending forming machine and a connecting device (600);

the heating furnace comprises a furnace body (400) and a turnable conveying device, wherein the turnable conveying device comprises a first conveying section (100) and a second conveying section (200), the rear half section of the first conveying section (100) is arranged on the front side in the furnace body (400), the second conveying section (200) of the turnable conveying device is arranged in the furnace body (400), the tail end of the second conveying section (200) extends out of the furnace body (400), the furnace body (400) comprises a first heating section (410) and a second heating section (420), electric heating assemblies (430) are arranged in the first heating section (410) and the second heating section (420), a preheating area (411) is arranged at the front end of the first heating section (410), and a lifting heat insulation plate (440) is arranged between the first heating section (410) and the second heating section (420);

the bending forming machine comprises: the bending device comprises a machine body (1000), wherein a conveying device (2000) is arranged on the machine body (1000), the conveying device (2000) penetrates through the middle lower part of the machine body (1000), a bending device (3000) is installed on the machine body (1000) on the upper part of the conveying device (2000), the bending device (3000) comprises a movable die assembly (3100) and a pressing die assembly (3200) which are matched with each other, and the bending device further comprises a supporting assembly (3300) for supporting the movable die assembly (3100);

the engagement device (600): the setting is between heating furnace and bending forming machine, including the heat preservation cover body (610), be equipped with on the inner wall of the heat preservation cover body (610) and transport slide rail (620), be equipped with on transporting slide rail (620) and transport piece (630), the lower extreme of transporting piece (630) be equipped with electro-magnet (640), the telescopic link of transporting cylinder (650) is connected to one side of transporting piece (630).

2. The plate spring hot bending forming unit according to claim 1, wherein the first conveying section (100) and the second conveying section (200) are respectively provided with a conveying assembly (300), the bottom of the first conveying section (100) is provided with a rotating table (110), the lower side of the rotating table (110) is provided with a fixed table (120), and the plate spring hot bending forming unit further comprises a rotating mechanism (130) capable of enabling the rotating table (110) to rotate relative to the fixed table (120).

3. The plate spring hot bending forming unit according to claim 2, wherein a rotary slide rail (121) is arranged on the fixed platform (120), a sliding chute (111) matched with the rotary slide rail (121) is arranged on the lower side of the rotary platform (110), the rotating mechanism (130) comprises a driving air cylinder (131) arranged on the fixed platform (120), a telescopic rod of the driving air cylinder (131) is connected with a rack (132), and the rack (132) is meshed with a gear (133) fixed on the rotary platform (110);

the conveying assembly (300) comprises a plurality of first driven sprockets (310) arranged on cross beams (220) of the first conveying frame and the second conveying frame and a first driving sprocket (320) arranged at the outer end of the cross beam (220), the driving sprocket (2100) is driven by a motor, and chain type conveying belts (330) are meshed on the first driving sprocket (320) and the first driven sprocket (310).

4. The plate spring hot-bending forming unit according to claim 3, wherein the chain conveyor belt (330) comprises two first chains (331) engaged with the first driving sprocket (320) and the first driven sprocket (310), a plurality of rotating shafts (332) are arranged between the two first chains (331), a segmented high-temperature resistant conveying screen plate (333) is arranged between the rotating shafts (332), and a push plate (334) is further arranged on a single rotating shaft (332).

5. The plate spring hot bending forming unit according to claim 1, wherein the bending forming machine comprises a machine body (1000), a conveying device (2000) is arranged on the machine body (1000), the conveying device (2000) penetrates through the middle lower part of the machine body (1000), a bending device (3000) is mounted on the machine body (1000) at the upper part of the conveying device (2000), the bending device (3000) comprises a movable die assembly (3100) and a pressing die assembly (3200) which are matched with each other, and the bending forming machine further comprises a supporting assembly (3300) for supporting the movable die assembly (3100).

6. The plate spring hot bending forming unit according to claim 1, wherein the conveying device (2000) comprises at least two groups of second driving chain wheels (2100) and second driven chain wheels (2200), the first driving chain wheel (320) is driven by a stepping motor, second chains (2300) are arranged on the second driving chain wheels (2100) and the second driven chain wheels (2200), a conveyor belt (2400) is arranged between the two second chains (2300), and a plurality of groups of steel plate inclined supporting plate groups (2500) are arranged on the conveyor belt (2400); each group of the plate spring inclined support plate group comprises a first inclined support plate (2510) and a second inclined support plate (2520), and the height of the first inclined support plate (2510) in the machine body (1000) is higher than that of the second inclined support plate (2520).

7. The plate spring hot bending forming unit according to claim 5, wherein a centralized installation plate beam (1100) is arranged at the top of the machine body (1000), and the movable die assembly (3100), the die assembly (3200) and the support assembly (3300) are all installed on the centralized installation plate beam (1100);

the movable mold assembly (3100) comprises a first movable mold (3101), a second movable mold (3102), a third movable mold (3103), a fourth movable mold (3104) and a fifth movable mold (3105), wherein two ends of the first movable mold (3101), the second movable mold (3102), the third movable mold (3103), the fourth movable mold (3104) and the fifth movable mold (3105) are respectively connected with telescopic rods of a first driving cylinder group (3106), a second driving cylinder group (3107), a third driving cylinder group (3108), a fourth driving cylinder group (3109) and a fifth driving cylinder group (3110), and the first driving cylinder group (3106), the second driving cylinder group (3107), the third driving cylinder group (3108), the fourth driving cylinder group (3109) and the fifth driving cylinder group (3110) are fixed on the centralized mounting plate beam (1100) in a trapezoidal shape from front to back;

the die pressing assembly (3200) comprises a first die pressing head (3201), a second die pressing head (3202), a third die pressing head (3203), a fourth die pressing head (3204) and a fifth die pressing head (3205) which are matched with all moving dies of the moving die assembly (3100), the first die pressing head (3201), the second die pressing head (3202), the third die pressing head (3203), the fourth die pressing head (3204) and the fifth die pressing head (3205) are all arranged on a die pressing rod (3206), the die pressing rod (3206) is connected with a telescopic rod of a hydraulic cylinder (3207), and the hydraulic cylinder (3207) can be arranged between the centralized mounting plate beam (1100) and the machine body (1000) in a vertically sliding mode through a lifting cylinder (3209);

support assembly (3300) include to each movable mould correspondence of movable mould subassembly (3100) carry out the first backup pad (3301), second backup pad (3302), third backup pad (3303), fourth backup pad (3304) and fifth backup pad (3305) that support, first backup pad (3301), second backup pad (3302), third backup pad (3303), fourth backup pad (3304) and fifth backup pad (3305) all fix on supporting total pole (3306), the telescopic link of total pole lift cylinder (3307) is connected at the both ends of supporting total pole (3306), total pole lift cylinder (3307) are fixed at the both ends of concentrating installation plate beam (1100).

8. The plate spring hot bending forming unit according to claim 7, wherein lifting slide rails (3208) are arranged on the outer side of the centralized mounting plate beam (1100) and the inner side of the machine body (1000), and a shell of the hydraulic cylinder (3207) is provided with a sliding groove (111) matched with the two lifting slide rails (3208).

9. A hot bending forming process for a plate spring is characterized by comprising the following steps:

s1, placing the steel plate to be bent on the turnable conveying device, heating the steel plate by the heating furnace, wherein the turnable conveying device drives the steel plate to stay in a preheating area (411) of the furnace body (400) for 10-60S during heating, preheating the steel plate, and then continuously conveying the steel plate into the furnace body (400) for heating;

s2, transferring the heated steel plate to a bending forming machine through a connecting device (600) for bending.

10. The process for hot-bending leaf springs according to claim 1, wherein in step 1, the steel plates to be bent are placed on the steerable conveyor in the order of short to long, and the temperature after heating in the furnace (400) is 850 ° to 900 °.

Technical Field

The invention relates to the technical field of plate spring processing, in particular to a plate spring hot bending forming unit and a hot bending forming process.

Background

The spring is formed by overlapping a single steel plate or a plurality of steel plates. The plate spring has a large damping capacity due to friction between plates, and is widely used in suspensions of automobiles, tractors, and railway vehicles.

In the processing process of the plate spring, the steel plate needs to be heated, bent and quenched, in the technical scheme of the heating furnace in the prior art, only a single plate spring can be heated, and only the end part of the plate spring can be heated, so that the heating efficiency is low and the function is single; when heating the leaf spring, do not preheat the leaf spring, directly heat, there is certain influence to the performance of steel sheet, and the heating mode who adopts is fuel combustion heating, has certain polluted environment's problem.

Disclosure of Invention

Aiming at the defects in the prior art, the first purpose of the invention is to provide a plate spring hot bending forming unit, which can heat and bend different steel plates forming a plate spring at the same time, so that the steel plates have consistent performance, the performance of the formed plate spring is more stable, and a plurality of steel plates are processed at the same time, so that the production efficiency is improved, and the plate spring hot bending forming unit is energy-saving and environment-friendly.

The second purpose of the invention is to provide a hot bending forming process for the plate spring, which utilizes the machine set and has convenient operation and high production efficiency.

The first purpose of the invention is realized by the following technical scheme:

a plate spring hot bending forming unit comprises a heating furnace, a bending forming machine and a connecting device;

the heating furnace comprises a furnace body and a steerable conveying device, wherein the steerable conveying device comprises a first conveying section and a second conveying section, the rear half section of the first conveying section is arranged on the front side in the furnace body, the second conveying section of the steerable conveying device is arranged in the furnace body, the tail end of the second conveying section extends out of the furnace body, the furnace body comprises a first heating section and a second heating section, electric heating components are arranged in the first heating section and the second heating section, a preheating zone is arranged at the front end of the first heating section, and a liftable heat insulation plate is arranged between the first heating section and the second heating section;

the bending forming machine comprises: the bending device comprises a machine body, wherein a conveying device is arranged on the machine body and penetrates through the middle lower part of the machine body, a bending device is arranged on the machine body on the upper part of the conveying device, the bending device comprises a movable die assembly and a pressing die assembly which are matched with each other, and the bending device also comprises a supporting assembly for supporting the movable die assembly;

the engaging device is characterized in that: the setting is between heating furnace and bending forming machine, including the heat preservation cover body, be equipped with the transportation slide rail on the inner wall of the heat preservation cover body, be equipped with the transportation piece on the transportation slide rail, the lower extreme of transportation piece be equipped with the electro-magnet, the telescopic link of transporting the cylinder is connected to one side of transporting the piece.

By adopting the technical scheme: each steel sheet of treating the bending is heated to the heating furnace, when the heating begins, preheat the steel sheet earlier, guaranteed that the performance of steel sheet does not receive the direct heating and suffers destruction, the steel sheet after the heating is delivered to bending forming machine through linking device and is carried out bending forming, above-mentioned equipment group, can handle a plurality of steel sheets of constituteing a leaf spring simultaneously, the production efficiency has been improved, the electro-magnet intermittent type formula circular telegram of linking device, after furnace body end circular telegram adsorbs the steel sheet, the transport cylinder promotes to transport the piece and gos forward to bending forming machine's conveyor and goes out, put down the steel sheet.

The present invention in a preferred example may be further configured to: first conveying section and second conveying section on all be equipped with conveying assembly, the bottom of first conveying section be equipped with the revolving stage, the downside of revolving stage is equipped with the fixed station, still including making the revolving stage relative fixed station pivoted slewing mechanism.

By adopting the technical scheme: the first conveying section and the second conveying section are arranged in a split mode, the first conveying section can rotate through the rotating mechanism, the first conveying section and the second conveying section can be combined into a whole according to needs, the steel plate conveying the whole body enters the heating furnace to be heated, the steel plate conveying part can also be partially turned to be used in a split mode, the steel plate conveying part enters the furnace body to be heated, and the steel plate conveying part is curled into a rolling lug, so that the multipurpose of the heating furnace is achieved.

The present invention in a preferred example may be further configured to: the fixed table is provided with a rotary slide rail, the lower side of the rotary table is provided with a slide groove matched with the rotary slide rail, the rotating mechanism comprises a driving air cylinder arranged on the fixed table, a telescopic rod of the driving air cylinder is connected with a rack, and the rack is meshed with a gear fixed on the rotary table;

the conveying assembly comprises a plurality of first driven sprockets arranged on the cross beam of the first conveying frame and the cross beam of the second conveying frame and a first driving sprocket arranged at the outer end of the cross beam, the driving sprocket is driven by a motor, and chain type conveying belts are meshed on the first driving sprocket and the first driven sprocket.

By adopting the technical scheme: the rotary sliding rail is arranged on the fixed table in a semicircular shape, the rotary table can rotate with the fixed table through the matching between the sliding groove and the rotary sliding rail, in order to realize the rotation, a rotating mechanism is arranged, a telescopic rod of the air cylinder extends out through a driving air cylinder fixed on the fixed table to drive a rack to move towards one direction, the rack is meshed with a gear to drive the gear to rotate, the gear is fixedly connected with the rotary table to drive the rotary table to rotate relative to the fixed table, and the combination or the split of the first conveying section and the second conveying section is realized; first support body through with revolving stage fixed connection, realized the fixed of first transmission section with the revolving stage, the conveying subassembly is used for conveying the steel sheet that is used for making the leaf spring of treating the heating, enters into the furnace body and heats.

The present invention in a preferred example may be further configured to: the chain type conveying belt comprises two first chains meshed with a first driving chain wheel and a first driven chain wheel, a plurality of rotating shafts are arranged between the two first chains, a segmented high-temperature-resistant conveying screen plate is arranged between the rotating shafts, and a push plate is further arranged on a single rotating shaft.

By adopting the technical scheme: the chain type conveying belt with the structure has high temperature resistance, can convey the steel plate to enter the furnace body for heating, and the push plate plays a role in pushing the steel plate, so that the steel plate does not slide on the conveying belt.

The present invention in a preferred example may be further configured to: the bending forming machine comprises a machine body, wherein a conveying device is arranged on the machine body and penetrates through the middle lower part of the machine body, a bending device is arranged on the machine body on the upper part of the conveying device, and the bending device comprises a movable die assembly, a pressing die assembly and a supporting assembly, wherein the movable die assembly and the pressing die assembly are matched with each other, and the supporting assembly is used for supporting the movable die assembly.

By adopting the technical scheme: treat crooked steel sheet, carry to the organism in through conveyor, the movable mould subassembly descends this moment, conveyor continues to drive the steel sheet antedisplacement, the steel sheet is at conveyor's last initial condition, its one end tilt up that gets into the organism, be vertical state in the later stage of being convenient for, carry to be to the mode under the movable mould subassembly, the movable mould subassembly begins to descend, under the effect of blockking up of each movable mould and conveyor continue to carry, the steel sheet is vertical state gradually, the support assembly descends and is used for supporting the movable mould subassembly here simultaneously, the moulding-die subassembly descends, promote the movable mould to the steel sheet through pneumatic cylinder drive moulding-die, make the steel sheet bending gradually, crooked in-process, conveyor stops temporarily, wait for after the completion of bending, continue the operation, carry out the steel sheet that the bending was accomplished, bring next group of steel sheet into the organism simultaneously.

The present invention in a preferred example may be further configured to: the conveying device at least comprises two groups of second driving chain wheels and second driven chain wheels, the first driving chain wheel is driven by a stepping motor, second chains are arranged on the second driving chain wheels and the second driven chain wheels, a conveying belt is arranged between the two second chains, and a plurality of groups of steel plate inclined supporting plate groups are arranged on the conveying belt; each group of the plate spring inclined supporting plate groups comprises a first inclined supporting plate and a second inclined supporting plate, and the height of the first inclined supporting plate in the machine body is higher than that of the second inclined supporting plate.

By adopting the technical scheme: the second driving sprocket is driven by step motor and rotates to drive the rotation of second driven sprocket, drive the conveyer belt and rotate, wherein the conveyer belt has high temperature resistance, and steel sheet bearing diagonal group makes the steel sheet be in the device of slope on the conveyer belt, and the later stage of being convenient for is bent the steel sheet is vertical. Being close to the direction that the steel sheet got into the organism for first inclined support board, being the second inclined support board behind the first inclined support board, the height that highly is higher than the second inclined support board of first inclined support board, aim at makes the steel sheet slope, the one end that enters into the organism earlier in addition is higher than the one end that enters into the organism afterwards.

The present invention in a preferred example may be further configured to: the top of the machine body is provided with a centralized installation plate beam, and the movable die assembly, the die assembly and the supporting assembly are all installed on the centralized installation plate beam. The centralized mounting plate beam is used for mounting the movable mould assembly, the die assembly and the supporting assembly, and the integrity of the equipment is improved.

The movable mould assembly comprises a first movable mould, a second movable mould, a third movable mould, a fourth movable mould and a fifth movable mould, wherein two ends of the first movable mould, the second movable mould, the third movable mould, the fourth movable mould and the fifth movable mould are respectively connected with telescopic rods of a first driving cylinder group, a second driving cylinder group, a third driving cylinder group, a fourth driving cylinder group and a fifth driving cylinder group, and the first driving cylinder group, the second driving cylinder group, the third driving cylinder group, the fourth driving cylinder group and the fifth driving cylinder group are fixed on the centralized mounting plate beam in a trapezoidal shape from front to back. According to the quantity that the single steel sheet quantity of every shaping leaf spring set up the movable mould, this technical scheme is used for making five board-like leaf springs, and every drive cylinder group includes two cylinders for promote or reduce a movable mould, and the movable mould has the size to distinguish, can be gradually big by left side to right side, bends little steel sheet to big steel sheet to the leaf spring in proper order.

The die assembly comprises a first die head, a second die head, a third die head, a fourth die head and a fifth die head which are matched with each moving die of the moving die assembly, the first die head, the second die head, the third die head, the fourth die head and the fifth die head are all arranged on a die rod, the die rod is connected with a telescopic rod of a hydraulic cylinder, and the hydraulic cylinder can be arranged between the centralized mounting plate beam and the machine body in a vertical sliding mode through a lifting cylinder. The die heads are matched with the moving die, and the purpose of the die heads is to bend a single steel plate.

The supporting component comprises a first supporting plate, a second supporting plate, a third supporting plate, a fourth supporting plate and a fifth supporting plate which are used for supporting the movable moulds of the movable mould component, wherein the first supporting plate, the second supporting plate, the third supporting plate, the fourth supporting plate and the fifth supporting plate are all fixed on a supporting main rod, two ends of the supporting main rod are connected with telescopic rods of main rod lifting cylinders, and the main rod lifting cylinders are fixed at two ends of a concentrated mounting plate beam.

By adopting the technical scheme: the supporting plates correspond to the movable dies one to one, and the purpose is to provide a supporting force for the movable dies when the steel plate is bent, so that the acting force is prevented from acting only on the telescopic rods of the driving cylinder group, and the telescopic rods are prevented from being damaged.

The present invention in a preferred example may be further configured to: the outer side of the centralized mounting plate beam and the inner side of the machine body are both provided with lifting slide rails, and the shell of the hydraulic cylinder is provided with slide grooves matched with the two lifting slide rails.

By adopting the technical scheme: the hydraulic cylinder can be lifted and dropped, so that the space is conveniently vacated, and the steel plate is vertically bent and formed.

The second purpose of the invention is realized by the following technical scheme:

a hot bending forming process for a plate spring comprises the following steps:

s1, placing the steel plate to be bent on the turnable conveying device, heating the steel plate by the heating furnace, wherein the turnable conveying device drives the steel plate to stay in a preheating zone of the furnace body for 10-60S during heating, preheating the steel plate, and then continuously conveying the steel plate into the furnace body for heating;

and S2, transferring the heated steel plate into a bending forming machine through a connecting device to be bent.

By adopting the technical scheme: a plurality of steel plates forming one plate spring can be heated and bent at the same time, and the production efficiency is improved.

The present invention in a preferred example may be further configured to: in step 1, the steel plate to be bent is placed on the steerable conveyor in the order of short to long steel plate of the assembled leaf spring, and the temperature is 850-900 ° after heating in the furnace.

By adopting the technical scheme: the arrangement sequence is convenient for the direct formation of a plate spring in the later period, and time and labor are saved.

In summary, the invention includes at least one of the following beneficial technical effects:

1. this unit can heat and crooked simultaneously to the steel sheet of a leaf spring of constitution, difference, makes these steel sheets have the performance uniformity, and the leaf spring performance of its constitution is also more stable, processes a plurality of steel sheets simultaneously moreover, has improved production efficiency, still energy-concerving and environment-protective.

2. The process utilizes the machine set, is convenient to operate and has high production efficiency.

Drawings

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

FIG. 2 is a schematic view of the structure of the heating furnace of the present invention.

Fig. 3 is a schematic view of a steerable delivery device of the present invention.

Fig. 4 is a schematic view of the rotational structure of the present invention.

Fig. 5 is a schematic view of the structure of the chain conveyor belt of the invention.

FIG. 6 is a schematic view of the engagement device of the present invention.

Fig. 7 is a schematic structural view of the bending machine of the present invention.

FIG. 8 is a schematic structural view of a movable die assembly of the present invention.

FIG. 9 is a schematic view of the mounting structure of the movable die assembly of the present invention.

FIG. 10 is a schematic view of the structure of the die assembly of the present invention.

Fig. 11 is a schematic structural view of the support assembly of the present invention.

The labels in the figure are:

100. a first transfer section; 110. a rotating table; 111. a chute; 120. a fixed table; 121. a slide rail; 130. a rotating mechanism; 131. a driving cylinder; 132. a rack; 133. a gear; 134. a mounting seat; 140. a first frame body; 200. a second transfer section; 210. a second frame body; 220. a cross beam; 300. a transfer assembly; 310. a first driven sprocket; 320. a first drive sprocket; 330. a chain conveyor belt; 331. a first chain; 332. a rotating shaft; 333. a high temperature resistant delivery screen; 334. pushing the plate; 400. a furnace body; 410. a first heating section; 411. a preheating zone; 420. a second heating section; 430. an electrical heating assembly; 440. a heat insulation plate; 500. a push-pull cylinder; 600. a joining device; 610. a heat preservation cover body; 620. a transfer slide rail; 630. a transfer block; 640. an electromagnet; 650. a transfer cylinder; 1000. a body; 1100. installing plate beams in a centralized manner; 2000. a conveying device; 2100. a drive sprocket; 2200. a driven sprocket; 2300. a chain; 2400. a conveyor belt; 2500. a steel plate inclined supporting plate group; 2510. a first inclined support plate; 2520. a second inclined support plate; 3000. a bending device; 3100. a movable die assembly; 3101. a first movable mold; 3102. a second movable mold; 3103. a third movable mould; 3104. a fourth movable mold; 3105. a fifth movable mould; 3106. a first driving cylinder group; 3107. a second driving cylinder group; 3108. a third driving cylinder group; 3109. a fourth driving cylinder group; 3110. a fifth driving cylinder group; 3200. a die assembly; 3201. a first die head; 3202. a second die head; 3203. a third die head; 3204. a fourth die head; 3205. a fifth die head; 3206. a mold pressing rod; 3207. a hydraulic cylinder; 3208. lifting the slide rail; 3209. a lift cylinder; 3300. a support assembly; 3301. a first support plate; 3302. a second support plate; 3303. a third support plate; 3304. a fourth support plate; 3305. a fifth support plate; 3306. a support main rod; 3307. a main rod lifting cylinder; 3308. and a reinforcing plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.