Double-pot countercurrent mixer

Abstract

The utility model discloses a double-pot countercurrent mixer which comprises a rack I and a rack II, two sides of the top of the rack I are respectively and rotatably connected with a rotating shaft I and a rotating shaft II, the rotating shaft I is fixedly connected with a swing arm I, one end of the swing arm I is fixedly connected with a pot cover I, one end of the rotating shaft II is fixedly connected with a swing arm II, and one end of the swing arm II is provided with an upper pot; a third rotating shaft is rotationally connected to one side of the top of the second rack, a third swing arm is fixedly connected to the third rotating shaft, and a locking mechanism is arranged on the second rack. A lower pot is arranged on the upper portion of the interior of the third swing arm, a fourth rotating shaft is rotationally connected to one side of the top of the third swing arm, a fourth swing arm is fixedly connected to the fourth rotating shaft, a second pot cover is fixedly connected to one end of the fourth swing arm, and stirring mechanisms are installed on the first pot cover and the second pot cover. According to the utility model, the pot cover II and the lower pot are inclined synchronously, so that countercurrent mixing in an inclined state is realized, materials can be fully mixed conveniently, and auxiliary materials, namely powder and liquid, can better wrap main material particles.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mixer technical field, concretely relates to a double-pot counterflow mixer. BACKGROUND

[0002] The double-pot counterflow mixer is suitable for mixing powder resin molding material, adopts double-pot structure, and the upper pot is used for wet mixing, and the lower pot is used for dry mixing.When the molding material is stirred, the material pot rotates to the left, and the blade rotates to the right, due to the effect of counterflow, the movement direction of each particle of the molding material is crossed, the opportunity of mutual contact is increased, and the double-pot counterflow mixer has small extrusion force on the material, low heat output and high stirring efficiency.

[0003] The existing double-pot counterflow mixer, the rotation shafts of the material pot and the blade are in the vertical direction, and the molding material in the material pot will be layered to a certain extent under the action of gravity, especially during dry mixing of the lower pot, because the granularity and density of the abrasive and the resin powder are quite different, the layering phenomenon is more obvious. SUMMARY

[0004] The utility model discloses to solve the problem that the existing double-pot counterflow mixer, the rotation shafts of the material pot and the blade are in the vertical direction, and the molding material in the material pot will be layered to a certain extent under the action of gravity, and proposes a double-pot counterflow mixer, integrates the lower pot and the pot cover two equipped with stirring mechanism on the swing arm three, makes the pot cover two and the lower pot synchronous inclination, realizes counterflow mixing in the inclined state, makes the material between fully mix conveniently, avoids that material appears layering and influences mixing effect, and makes the auxiliary material, i.e. powder and liquid better package and attach the main material particle.

[0005] In order to realize the above-mentioned purpose, the technical scheme of the utility model is:

[0006] A double-pot counterflow mixer, including frame one and frame two, the both sides of the top of frame one are respectively connected with rotation shaft one and rotation shaft two, the outer wall of rotation shaft one is fixedly connected with swing arm one, one end of swing arm one is fixedly connected with pot cover one, one end of rotation shaft two is fixedly connected with swing arm two, and the upper pot is arranged at one end of swing arm two; one side of the top of frame two is rotatably connected with rotation shaft three, the outer wall of rotation shaft three is fixedly connected with swing arm three, and the locking mechanism for locking swing arm three is arranged on frame two; the lower pot is arranged at the upper portion in swing arm three, one side of the top of swing arm three is rotatably connected with rotation shaft four, the outer wall of rotation shaft four is fixedly connected with swing arm four, one end of swing arm four is fixedly connected with pot cover two, and the stirring mechanism is installed on pot cover one and pot cover two.

[0007] Further, the locking mechanism comprises a crossbeam, a locking oil cylinder and a locking pin shaft, the crossbeam is fixedly connected to the second rack, a mounting seat and a guide table are fixedly arranged on the top of the crossbeam, the mounting seat is fixedly sleeved on the cylinder body of the locking oil cylinder, a guide hole is formed in the guide table, the piston rod of the locking oil cylinder is hingedly connected to one end of the locking pin shaft, and the outer wall of the third rotating shaft is further fixedly connected to a limiting plate, a plurality of through holes are formed in the bottom of the limiting plate, and the other end of the locking pin shaft is inserted into the through hole on the limiting plate after passing through the guide hole.

[0008] Further, the crossbeam is further provided with a detection device, the detection device comprises proximity switches one and two and a support, the proximity switches one and two are arranged on one side of the support in the axial direction of the locking oil cylinder, and a stopper is arranged on the outer wall of the locking pin shaft; a proximity switch three is arranged on the other side of the support, the bottom of the limiting plate is fixedly connected to an arc-shaped plate, a waist-shaped hole is formed in the arc-shaped plate, and a bolt is arranged in the waist-shaped hole. In specific use, the bolt is fixed in the waist-shaped hole through a locking nut.

[0009] Further, one end of the third rotating shaft is provided with an encoder and a sector block, the encoder is connected to the second rack through a connecting frame, the sector block and the input shaft of the encoder are fixedly connected to the third rotating shaft, a base is arranged below the sector block, the base is fixedly connected to the second rack, an arc-shaped sliding groove is formed in the base, and proximity switch four is arranged on the two sides in the arc-shaped sliding groove.

[0010] Further, the stirring mechanism comprises a motor one and a speed reducer one, the motor shaft of the motor one is fixedly connected to the input shaft of the speed reducer one, the output shaft of the speed reducer one penetrates through the pot cover one or the pot cover two and is fixedly connected to a stirring assembly, the stirring assembly comprises a cross plate, two opposite ends of the cross plate are respectively provided with stirring rods, and the other two opposite ends of the cross plate are respectively provided with material turning rods, and the bottom end of each material turning rod is fixedly connected to a material turning plate. When the upper pot or the lower pot rotates, the motor one is started to drive the speed reducer one to rotate, and the cross plate rotates to drive the stirring rods, the material turning rods and the material turning plates to rotate, so that the stirring and material turning are realized at the same time, and the stirring effect is improved.

[0011] Further, the pot cover one and the pot cover two are the same in structure and comprise fixed cover plates and movable cover plates, the movable cover plates are hingedly connected to the fixed cover plates, the movable cover plate of the pot cover one is provided with a feeding opening one, the fixed cover plate of the pot cover two is provided with a feeding opening two, and the bottom of the fixed cover plate of the pot cover one and the pot cover two is further respectively provided with a scraper. The scraper is arranged to scrape the inner wall of the upper pot or the lower pot.

[0012] Further, the upper pot and the lower pot are provided with driving mechanisms, the driving mechanism comprises a second motor and a second speed reducer, the motor shaft of the second motor is fixedly connected with the input shaft of the second speed reducer, and the output shaft of the second speed reducer is fixedly connected with the upper pot or the lower pot.

[0013] Further, the swing arm one is provided with an oil cylinder one, the two ends of the oil cylinder one are respectively hinged with the swing arm one and the rack one, the swing arm two is provided with an oil cylinder two, the two ends of the oil cylinder two are respectively hinged with the swing arm two and the rack one, the swing arm three is provided with an oil cylinder three, the two ends of the oil cylinder three are respectively hinged with the swing arm three and the rack two, and the middle part of the swing arm four is provided with an oil cylinder four, the two ends of the oil cylinder four are respectively hinged with the swing arm four and the swing arm three.

[0014] By the above technical scheme, the double-pot counter-flow mixing machine has the following beneficial effects:

[0015] The lower pot and the pot cover two provided with the stirring mechanism are integrated on the swing arm three, so that the pot cover two and the lower pot are synchronously inclined, counter-flow mixing is realized in the inclined state, the materials are fully mixed, the materials are prevented from being stratified and the mixing effect is prevented from being affected, and meanwhile, the locking mechanism is arranged, the piston rod of the oil cylinder is locked and extended, the locking pin shaft is inserted into the round hole in the limiting plate, the swing arm three is rigidly locked when hydraulic failure occurs, and the safety protection function is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the double-pot counter-flow mixing machine;

[0017] Figure 2 It is a front view of the double-pot counter-flow mixing machine;

[0018] Figure 3 It is a left view of the double-pot counter-flow mixing machine;

[0019] Figure 4 It is a perspective view of the double-pot counter-flow mixing machine Figure 1 ;

[0020] Figure 5 It is an enlarged view of the position C in the double-pot counter-flow mixing machine Figure 4 ;

[0021] Figure 6 It is an enlarged view of the position D in the double-pot counter-flow mixing machine Figure 4 ;

[0022] Figure 7The utility model discloses a double-pot counter-current mixer

[0023] Figure 8 The utility model discloses a double-pot counter-current mixer Figure 2 The utility model discloses a double-pot counter-current mixer

[0024] Figure 9 The utility model discloses a double-pot counter-current mixer

[0025] The utility model discloses a double-pot counter-current mixer

[0026] 1, frame one;2, frame two;3, pivot one;4, pivot two;5, swing arm one;6, pot cover one;7, swing arm two;8, upper pot;9, pivot three;10, swing arm three;11, lower pot;12, pivot four;13, swing arm four;14, pot cover two;15, crossbeam;16, locking cylinder;17, locking pin;18, mounting seat;19, guide table;20, limit board;21, through hole;22, proximity switch one;23, proximity switch two;24, support;25, stopper;26, proximity switch three;27, arc plate;28, waist-shaped hole;29, bolt;30, encoder;31, sector block;32, connecting frame;33, base;34, circular arc sliding slot;35, proximity switch four;36, motor one;37, speed reducer one;38, cross plate;39, stirring rod;40, material turning rod;41, material turning plate;42, feeding port one;43, feeding port two;44, scraper;45, motor two;46, speed reducer two;47, cylinder one;48, cylinder two;49, cylinder three;50, cylinder four. Specific implementation

[0027] The utility model discloses a double-pot counter-current mixer

[0028] As Figures 1-9As shown, the embodiment provides a double-pot counter-current mixer, which comprises a frame one 1 and a frame two 2, two rotating shafts one 3 and two rotating shafts two 4 are rotatably connected to the two sides of the top of the frame one 1 respectively, the outer wall of the rotating shaft one 3 is fixedly connected with a swing arm one 5, one end of the swing arm one 5 is fixedly connected with a pot cover one 6, one end of the rotating shaft two 4 is fixedly connected with a swing arm two 7, and the swing arm two 7 is provided with an upper pot 8; one side of the top of the frame two 2 is rotatably connected with a rotating shaft three 9, the outer wall of the rotating shaft three 9 is fixedly connected with a swing arm three 10, and the frame two 2 is provided with a locking mechanism for locking the swing arm three 10; the inside of the swing arm three 10 is provided with a lower pot 11, one side of the top of the swing arm three 10 is rotatably connected with a rotating shaft four 12, the outer wall of the rotating shaft four 12 is fixedly connected with a swing arm four 13, one end of the swing arm four 13 is fixedly connected with a pot cover two 14, and the pot cover one 6 and the pot cover two 14 are both provided with a stirring mechanism.

[0029] Please refer again to Figure 5 and Figure 7 , the locking mechanism comprises a cross beam 15, a locking oil cylinder 16 and a locking pin shaft 17, the cross beam 15 is fixedly connected on the frame two 2, the top of the cross beam 15 is fixedly provided with a mounting seat 18 and a guide table 19, the mounting seat 18 is fixedly sleeved on the cylinder body of the locking oil cylinder 16, the guide table 19 is provided with a guide hole, and the piston rod of the locking oil cylinder 16 is hingedly connected with one end of the locking pin shaft 17; the outer wall of the rotating shaft three 9 is further fixedly connected with a limiting plate 20, the bottom of the limiting plate 20 is provided with a plurality of through holes 21, and the other end of the locking pin shaft 17 is inserted into the through hole 21 on the limiting plate 20 after passing through the guide hole. In specific use, the locking pin shaft 17 is in sliding fit with the guide hole. By setting the locking mechanism, the piston rod of the locking oil cylinder 16 is extended, the locking pin shaft 17 is inserted into the round hole on the limiting plate 20, and the swing arm three 10 is rigidly locked when hydraulic failure occurs.

[0030] Further, the cross beam 15 is further provided with a detection device, the detection device comprises a proximity switch one 22, a proximity switch two 23 and a support 24, the proximity switch one 22 and the proximity switch two 23 are arranged on one side of the support 24 along the axial direction of the locking oil cylinder 16, and the outer wall of the locking pin shaft 17 is provided with a stop block 25; the other side of the support 24 is provided with a proximity switch three 26, the bottom of the limiting plate 20 is fixedly connected with an arc-shaped plate 27, the arc-shaped plate 27 is provided with a waist-shaped hole 28, and the waist-shaped hole 28 is provided with a bolt 29. Among them, the bolt 29 is fixed in the waist-shaped hole 28 by a locking nut, and when the locking nut is loosened, the position of the bolt 29 in the waist-shaped hole 28 can be adjusted. The proximity switch three 26 is used for inducting the bolt 29, and if the proximity switch three 26 generates an inductive signal, it is judged that the locking pin shaft 17 is correctly inserted into the through hole 21.

[0031] Please refer again Figure 6 , one end of the rotating shaft three 9 is provided with an encoder 30 and a sector block 31, the encoder 30 is connected to the rack two 2 through a connecting frame 32, the sector block 31 and the input shaft of the encoder 30 are fixedly connected with the rotating shaft three 9, a base 33 is arranged below the sector block 31, the base 33 is fixedly connected to the rack two 2, a circular arc sliding groove 34 is formed in the base 33, and a proximity switch four 35 is arranged on the two sides of the circular arc sliding groove 34. Through the cooperation of the encoder 30 and the proximity switch four 35, the angle through which the rotating shaft three 9 rotates is fed back by the encoder 30, and the rotating shaft three 9 drives the sector block 31 to swing, the proximity switch four 35 feeds back the starting position and the end position of the rotating shaft three 9 by detecting the sector block 31, when the lower pot 11 reaches the maximum stroke, the proximity switch four 35 feeds back this information to the controller, so that the oil cylinder three 49 can automatically stop working, and further damage is avoided.

[0032] In the embodiment, the proximity switch one 22, the proximity switch two 23, the proximity switch three 26 and the proximity switch four 35 are selected to be electromagnetic proximity switches. The electromagnetic proximity switch can detect in a non-contact manner, will not wear the detected object, and has stable performance and fast frequency response.

[0033] Specifically, the proximity switch one 22 and the proximity switch two 23 are used to induct the stop block 25 on the locking pin shaft 17 and generate an induction signal, wherein the stop block 25 is arranged in a circular ring structure around the outer wall of the locking pin shaft 17. If the proximity switch one 22 generates an induction signal, the piston rod of the locking oil cylinder 16 is retracted, that is, the locking pin shaft 17 is in the state of pulling out of the circular hole on the limiting plate 20; if the proximity switch two 23 generates an induction signal, the piston rod of the locking oil cylinder 16 is extended, that is, the locking pin shaft 17 is in the state of being inserted into the circular hole on the limiting plate 20, so that the insertion and extraction states of the locking pin shaft 17 can be judged by acquiring the induction signals generated by the proximity switch one 22 and the proximity switch two 23.

[0034] Please refer again Figure 8 and Figure 9The stirring mechanism comprises a motor 36 and a speed reducer 37, the motor shaft of the motor 36 is fixedly connected with the input shaft of the speed reducer 37, the output shaft of the speed reducer 37 penetrates the pot cover one 6 or the pot cover two 14 and is fixedly connected with a stirring assembly, the stirring assembly comprises a cross plate 38, two opposite ends of the cross plate 38 are respectively provided with stirring rods 39, and the other two opposite ends of the cross plate 38 are respectively provided with material turning rods 40, and the bottom end of the material turning rod 40 is fixedly connected with a material turning plate 41. When the upper pot 8 or the lower pot 11 rotates, the motor one 36 is started to drive the speed reducer one 37 to rotate, meanwhile, the cross plate 38 rotates to drive the stirring rod 39, the material turning rod 40 and the material turning plate 41 to rotate, so that the stirring and material turning are realized simultaneously, and the stirring effect is improved.

[0035] In the embodiment, the pot cover one 6 and the pot cover two 14 are the same in structure and comprise fixed cover plates and movable cover plates, the movable cover plates are hingedly connected with the fixed cover plates, the movable cover plate of the pot cover one 6 is provided with a feeding opening one 42, the fixed cover plate of the pot cover two 14 is provided with a feeding opening two 43, and the fixed cover plates of the pot cover one 6 and the pot cover two 14 are further respectively provided with scrapers 44 at the bottom. The scrapers 44 are arranged to scrape the inner walls of the upper pot 8 or the lower pot 11.

[0036] In the embodiment, the upper pot 8 and the lower pot 11 are respectively provided with driving mechanisms at the bottom, the driving mechanism comprises a motor two 45 and a speed reducer two 46, the motor shaft of the motor two 45 is fixedly connected with the input shaft of the speed reducer two 46, and the output shaft of the speed reducer two 46 is fixedly connected with the upper pot 8 or the lower pot 11. The motor two 45 is started to drive the speed reducer two 46 to rotate, and then the upper pot 8 or the lower pot 11 is driven to rotate.

[0037] Specifically, the swing arm one 5 is provided with an oil cylinder one 47, the two ends of the oil cylinder one 47 are hingedly connected with the swing arm one 5 and the rack one 1 respectively; the swing arm two 7 is provided with an oil cylinder two 48, the two ends of the oil cylinder two 48 are hingedly connected with the swing arm two 7 and the rack one 1 respectively; the swing arm three 10 is provided with an oil cylinder three 49, the two ends of the oil cylinder three 49 are hingedly connected with the swing arm three 10 and the rack two 2 respectively; and the middle part of the swing arm four 13 is provided with an oil cylinder four 50, the two ends of the oil cylinder four 50 are hingedly connected with the swing arm four 13 and the swing arm three 10 respectively. The above oil cylinders are arranged to drive the upper pot 8 and the lower pot 11 to tilt and to pour out materials.

[0038] The working principle of the utility model is as follows:

[0039] When the device is used for mixing, firstly, the material is fed through the feeding port 42, after the feeding is completed, the driving mechanism at the bottom of the upper pot 8 and the stirring mechanism on the pot cover 1 is started, the motor 2 45 drives the speed reducer 2 46 to rotate, and then drives the upper pot 8 to rotate, at the same time, the motor 1 36 drives the speed reducer 1 37 to rotate, the cross plate 38 rotates to drive the stirring rod 39 and the turning rod 40 and the turning plate 41 to rotate, which plays a role of stirring and turning at the same time; when the mixing of the upper pot 8 reaches the set mixing time, under the driving of the oil cylinder 1 47 and the oil cylinder 2 48, the upper pot 8 cover is opened and then the upper pot 8 is turned over, the formed material in the upper pot 8 will be discharged from the movable cover plate of the pot cover 1 6 and enter the lower pot 1 1 through the feeding port 2 43 on the pot cover 2 14, then the driving mechanism at the bottom of the lower pot 1 1 and the stirring mechanism on the pot cover 2 14 are started, at the same time, through the oil cylinder 3 49, the lower pot 1 1 and the pot cover 2 14 are synchronously turned over to the set angle, and the countercurrent mixing in the inclined state is realized; when the mixing of the lower pot 1 1 reaches the set mixing time, the swing arm 3 10 is continuously turned over through the oil cylinder 3 49, and the pot cover 2 14 is opened through the oil cylinder 4 50, and the formed material after the mixing is discharged.

[0040] The above-mentioned embodiments are only the preferred embodiments of the present application, and are not intended to limit the scope of the present application, therefore, equivalent changes or modifications made according to the structure, features and principles of the present application patent range should be included in the patent range of the present application.

Claims

1. A double kettle counter current mixer comprising a frame one (1) and a frame two (2), characterized in that, The both sides of the top of the frame one (1) are rotatably connected with the rotating shaft one (3) and the rotating shaft two (4), the outer wall of the rotating shaft one (3) is fixedly connected with the swing arm one (5), one end of the swing arm one (5) is fixedly connected with the pot cover one (6), one end of the rotating shaft two (4) is fixedly connected with the swing arm two (7), and one end of the swing arm two (7) is provided with the upper pot (8); the top of one side of the frame two (2) is rotatably connected with the rotating shaft three (9), the outer wall of the rotating shaft three (9) is fixedly connected with the swing arm three (10), and the frame two (2) is provided with a locking mechanism for locking the swing arm three (10); the inside of the swing arm three (10) is provided with the lower pot (11), one side of the top of the swing arm three (10) is rotatably connected with the rotating shaft four (12), the outer wall of the rotating shaft four (12) is fixedly connected with the swing arm four (13), one end of the swing arm four (13) is fixedly connected with the pot cover two (14), and the pot cover one (6) and the pot cover two (14) are both provided with the stirring mechanism.

2. A double kettle counter current mixer according to claim 1, wherein, The locking mechanism comprises the crossbeam (15), the locking oil cylinder (16) and the locking pin shaft (17), the crossbeam (15) is fixedly connected on the frame two (2), the top of the crossbeam (15) is fixedly provided with the mounting seat (18) and the guide table (19), the mounting seat (18) is fixedly sleeved on the cylinder body of the locking oil cylinder (16), the guide table (19) is provided with the guide hole, and one end of the piston rod of the locking oil cylinder (16) is hingedly connected with the locking pin shaft (17); the outer wall of the rotating shaft three (9) is further fixedly connected with the limiting plate (20), a plurality of through holes (21) are formed in the bottom of the limiting plate (20), and the other end of the locking pin shaft (17) is inserted into the through hole (21) on the limiting plate (20) after passing through the guide hole.

3. A double-kettle counter-current mixer according to claim 2, characterized in that The crossbeam (15) is further provided with a detection device, the detection device comprises the proximity switch one (22), the proximity switch two (23) and the support (24), the proximity switch one (22) and the proximity switch two (23) are arranged on one side of the support (24) along the axial direction of the locking oil cylinder (16), and the outer wall of the locking pin shaft (17) is provided with the stopper (25); the other side of the support (24) is provided with the proximity switch three (26), the bottom of the limiting plate (20) is fixedly connected with the arc-shaped plate (27), the arc-shaped plate (27) is provided with the waist-shaped hole (28), and the waist-shaped hole (28) is provided with the bolt (29).

4. A double kettle counter current mixer as claimed in claim 1 wherein, One end of the rotating shaft three (9) is provided with the encoder (30) and the sector block (31), the encoder (30) is connected to the frame two (2) through the connecting frame (32), the sector block (31) and the input shaft of the encoder (30) are fixedly connected with the rotating shaft three (9), the bottom of the sector block (31) is provided with the base (33), the base (33) is fixedly connected to the frame two (2), the base (33) is provided with the circular arc sliding groove (34), and the both sides of the inside of the circular arc sliding groove (34) are respectively provided with the proximity switch four (35).

5. A double kettle counter current mixer as claimed in claim 1 wherein, The stirring mechanism comprises a motor one (36) and a speed reducer one (37), a motor shaft of the motor one (36) is fixedly connected with an input shaft of the speed reducer one (37), an output shaft of the speed reducer one (37) penetrates through the pot cover one (6) or the pot cover two (14) and is fixedly connected with a stirring assembly, the stirring assembly comprises a cross plate (38), two opposite ends of the cross plate (38) are respectively provided with a stirring rod (39), and the other two opposite ends of the cross plate (38) are respectively provided with a material turning rod (40), a bottom end of the material turning rod (40) is fixedly connected with a material turning plate (41).

6. A double kettle counter current mixer as claimed in claim 1 wherein, The pot cover one (6) and the pot cover two (14) are the same in structure and comprise a fixed cover plate and a movable cover plate, the movable cover plate is hingedly connected with the fixed cover plate, the movable cover plate of the pot cover one (6) is provided with a feeding opening one (42), the fixed cover plate of the pot cover two (14) is provided with a feeding opening two (43), and the bottom of the fixed cover plate of the pot cover one (6) and the pot cover two (14) is further respectively provided with a scraper (44).

7. A double kettle counter current mixer as claimed in claim 1 wherein, The upper pot (8) and the lower pot (11) are provided with a driving mechanism at the bottom, the driving mechanism comprises a motor two (45) and a speed reducer two (46), a motor shaft of the motor two (45) is fixedly connected with an input shaft of the speed reducer two (46), and an output shaft of the speed reducer two (46) is fixedly connected with the upper pot (8) or the lower pot (11).

8. A double kettle counter current mixer as claimed in claim 1 wherein, The swing arm one (5) is provided with an oil cylinder one (47), two ends of the oil cylinder one (47) are hingedly connected with the swing arm one (5) and the rack one (1) respectively; the swing arm two (7) is provided with an oil cylinder two (48), two ends of the oil cylinder two (48) are hingedly connected with the swing arm two (7) and the rack one (1) respectively; the swing arm three (10) is provided with an oil cylinder three (49), two ends of the oil cylinder three (49) are hingedly connected with the swing arm three (10) and the rack two (2) respectively; and the middle part of the swing arm four (13) is provided with an oil cylinder four (50), two ends of the oil cylinder four (50) are hingedly connected with the swing arm four (13) and the swing arm three (10) respectively.

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