CN220699057U

CN220699057U - Centerless grinder for processing aerospace parts

Info

Publication number: CN220699057U
Application number: CN202322449400.8U
Authority: CN
Inventors: 吕鸿新; 颜凡荣; 王忠禹; 关景雪; 曹贺丹
Original assignee: Harbin Dongwei Aviation Parts Manufacturing Co ltd
Current assignee: Harbin Dongwei Aviation Parts Manufacturing Co ltd
Priority date: 2023-09-11
Filing date: 2023-09-11
Publication date: 2024-04-02
Anticipated expiration: 2033-09-11

Abstract

The utility model relates to the technical field of centerless grinding machines and discloses a centerless grinding machine for processing aerospace parts, which comprises a frame body, wherein a grinding machine body is arranged at the top of the frame body, mounting plates are arranged on the front side and the rear side of the top of the grinding machine body, a first driving motor is arranged on the rear side of the mounting plates, and an output shaft of the first driving motor extends to the front side of the rear mounting plates and is provided with a first mounting shaft with one end movably connected with the front mounting plates. This spaceflight parts processing centerless grinder carries out filtration through setting up the sewage after the filter comes the dust fall cooling to centerless grinder to make metal sweeps pile up at the top of filter, and the water after filtering then can gather on the interior bottom wall of grinding machine body, when need carry out dust fall cooling operation, can start the water pump and carry the inside of shower nozzle with the water in the grinding machine body, carry out dust fall cooling operation, with this water resource reuse.

Description

Centerless grinder for processing aerospace parts

Technical Field

The utility model relates to the technical field of centerless grinding machines, in particular to a centerless grinding machine for processing aerospace parts.

Background

The centerless grinding machine is a grinding machine which does not need to adopt the axial positioning of a workpiece to grind, and mainly comprises three mechanisms of a grinding wheel, an adjusting wheel and a workpiece support, wherein the grinding wheel is actually used for grinding, the adjusting wheel is used for controlling the rotation of the workpiece and controlling the feed speed of the workpiece, as for the workpiece support to support the workpiece during grinding, the three mechanisms can be matched with each other, except for stopping grinding, in principle, the three mechanisms are the same, in the field of aviation manufacturing, a plurality of aviation parts such as bearings are required to grind after production, so that the centerless grinding machine is used, but in the actual operation process, when the centerless grinding machine is used for processing bearing parts, dust fall and temperature reduction treatment is required to be carried out on the processing parts of the bearing parts, and sewage after the dust fall and temperature reduction treatment is not recycled, so that the condition of water resource waste is caused, so that the centerless grinding machine for processing aerospace parts is proposed.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the utility model provides a centerless grinder for processing aerospace parts, which has the advantages of recycling water resources and the like, and solves the problems that dust fall and cooling treatment are needed to be carried out on processing parts of bearing parts through the centerless grinder in the actual operation process, and sewage after the dust fall and cooling treatment is not recycled, so that the water resource waste condition is caused.

(II) technical scheme

In order to achieve the aim of recycling water resources, the utility model provides the following technical scheme: the utility model provides a spaceflight parts processing centerless grinder, includes the framework, the top of framework is provided with the grinding machine body, both sides all are provided with the mounting panel around the top of grinding machine body, the rear side of mounting panel is provided with first driving motor, first driving motor's output shaft extends to the front side of rear side mounting panel and is provided with one end and front side mounting panel swing joint's first installation axle, the top of grinding machine body is provided with the first through-hole that is located first installation axle below, the outside of first installation axle is provided with one end and passes first through-hole and extend to the inside grinding wheel of grinding machine body, the top of grinding machine body is provided with the movable block that is located the grinding wheel right side, both sides all are provided with the installation piece around the top of movable block, the rear side of installation piece is provided with the second driving motor, the output shaft of the second driving motor extends to the front side of the rear side mounting block and is provided with a second mounting shaft with one end movably connected with the front side mounting block, the outer side of the second mounting shaft is provided with a feeding adjusting wheel, the top of the grinding machine body is provided with a connecting block positioned on the right side of the moving block, the front end and the rear end of the right side of the connecting block are respectively provided with a hydraulic cylinder, the output ends of the two hydraulic cylinders extend to the left side of the connecting block and are fixedly connected with the right side of the moving block, the top of the grinding machine body is provided with an L-shaped plate positioned on the left side of the grinding wheel and one end of the L-shaped plate extends to the upper side of the grinding wheel, the bottom of the L-shaped plate is provided with a spray head positioned above the grinding wheel, the left side and the right side of the inner wall of the grinding machine body are respectively provided with a second through hole, a filter plate is arranged between the front side and the rear side of the inner wall of the grinding machine body, the left and right ends of filter pass two second through-holes respectively and extend to the left and right sides of grinding machine body respectively, the inner wall left and right sides of grinding machine body all is provided with the fixed block that is located the filter below, two the bottom of fixed block all is provided with one end and extends to its top and rather than filter bottom fixed connection's gag lever post, two the top of fixed block all is provided with the reset spring of cover respectively in two gag lever post outsides and one end and filter bottom fixed connection, the left and right sides of grinding machine body all is provided with the L type piece that is located the below, two the opposite side of L type piece all is provided with the pivot that one end extends to the grinding machine body inside, two the outside of pivot all is provided with the cam that is located the grinding machine body inside and is located between filter and the fixed block, the bottom left and right sides of filter all is provided with the pulley that is located two cams top respectively, be provided with one end and its inner wall fixed connection's drive assembly between the inner wall left and right sides of frame, the left and right ends in the drive assembly outside all is provided with one end respectively with two drive assembly's outside and the pivot of two end fixed connection, the other end that the side of L type piece extends to the inside of grinding machine body and the transmission assembly.

Preferably, the drive assembly comprises a double-shaft drive motor, the double-shaft drive motor is fixedly arranged on the inner bottom wall of the frame body, two support blocks which are respectively positioned on the left side and the right side of the double-shaft drive motor are fixedly arranged on the inner bottom wall of the frame body, and transmission shafts with one ends respectively extending to the opposite sides of the two support blocks and respectively movably connected with the left side and the right side of the inner wall of the frame body are fixedly arranged on the output shafts on the left side and the right side of the double-shaft drive motor.

Preferably, the transmission assembly comprises a first belt pulley, the outer sides of the two transmission shafts are fixedly provided with first belt pulleys respectively positioned on the opposite sides of the two supporting blocks, the outer sides of the two rotating shafts are fixedly provided with second belt pulleys respectively positioned on the left side and the right side of the grinding machine body, and the outer sides of the two first belt pulleys are respectively connected with belts with one ends respectively in transmission connection with the outer sides of the two second belt pulleys.

Preferably, the conveying assembly comprises a water pump, the water pump is fixedly arranged on the left side of the L-shaped plate, a water delivery pipe with one end extending to the right side of the L-shaped plate and fixedly connected with the spray head is fixedly arranged at the water outlet end of the water pump, and a water suction pipe with one end extending to the inside of the grinding machine body is fixedly arranged at the water inlet end of the water pump.

Preferably, the front side the rear side of mounting panel fixed mounting has first bearing, first installation axle passes through first bearing and front side mounting panel rotation to be connected.

Preferably, a second bearing is fixedly arranged on the rear side of the front side mounting block, and the second mounting shaft is rotatably connected with the front side mounting block through the second bearing.

(III) beneficial effects

Compared with the prior art, the utility model provides a centerless grinder for processing aerospace parts, which has the following beneficial effects:

this spaceflight parts processing centerless grinder filters the sewage after the cooling of centerless grinder dust fall through setting up the filter to make metal sweeps pile up at the top of filter, and the water after filtering then can gather on the interior bottom wall of grinding machine body, when needs carry out dust fall cooling operation, can start the water pump and carry the inside to the shower nozzle with the water in the grinding machine body, carry out dust fall cooling operation, thereby come to carry out reuse to the water resource, meanwhile, still accessible start biax driving motor drives two transmission shafts and two first belt pulleys rotation, and then drive two pivots and two cams rotation through two belts and two second belt pulleys, and the cam is at rotatory in-process then can extrude the pulley, so as to drive the filter and upwards move, then the cam can release the extrusion to the pulley, at this moment under reset spring's elasticity and gravity effect, the filter can move down fast and carry out the striking to the interior bottom wall of second through hole, then the cam can extrude the pulley again, reciprocating motion such as to make the filter reciprocate, come to drive two transmission shafts and two cams rotate, and then drive two pivots and two cams rotate, and then can make the filter roll down through the filter to the filter, the filter through the filter, the condition that the filter is convenient to take off the condition that the top is realized, the filter is realized through the slope, the realization of the filter is convenient to the realization of the vibration of the top through the filter, the filter has the vibration of the top of the filter.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic top view of a portion of the grinding machine body of the present utility model;

FIG. 3 is an enlarged view of the utility model at A in FIG. 1;

fig. 4 is a right side cam cross-sectional partial schematic view of the present utility model.

In the figure: 1 frame body, 2 grinding machine body, 3 mounting plates, 4 first driving motor, 5 first mounting shaft, 6 first through hole, 7 grinding wheel, 8 movable block, 9 mounting block, 10 second driving motor, 11 second mounting shaft, 12 feeding adjusting wheel, 13 connecting block, 14 hydraulic cylinder, 15L-shaped plate, 16 shower nozzle, 17 second through hole, 18 filter plate, 19 fixed block, 20 gag lever post, 21 reset spring, 22L-shaped block, 23 pivot, 24 cam, 25 pulley, 26 driving component, 261 biax driving motor, 262 supporting block, 263 transmission shaft, 27 transmission component, 271 first belt pulley, 272 second belt pulley, 273 belt, 28 conveying component, 281 water pump, 282 raceway, 283 drinking water pipe.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-4, the present utility model provides a technical solution: the utility model provides a spaceflight parts processing centerless grinder, including framework 1, the top fixed mounting of framework 1 has grinding machine body 2, both sides all fixed mounting has mounting panel 3 around the top of grinding machine body 2, the rear side fixed mounting of rear side mounting panel 3 has first driving motor 4, the model of first driving motor 4 is YZS-160-6, the output shaft of first driving motor 4 extends to the front side of rear side mounting panel 3 and fixed mounting has one end and front side mounting panel 3 swing joint's first installation axle 5, the rear side fixed mounting of front side mounting panel 3 has first bearing, first installation axle 5 passes through first bearing and front side mounting panel 3 rotation to be connected, the first through-hole 6 that is located first installation axle 5 below has been seted up at the top of grinding machine body 2, the outside fixed mounting of first installation axle 5 has one end to pass first through-hole 6 and extend to grinding wheel 7 inside grinding machine body 2.

The top movable mounting who is located grinding wheel 7 right side of grinding machine body 2 movable mounting has movable block 8, both sides all fixed mounting have installation piece 9 around the top of movable block 8, the rear side fixed mounting of rear side installation piece 9 has second driving motor 10, the model of second driving motor 10 is Y355, the output shaft of second driving motor 10 extends to the front side of rear side installation piece 9 and fixed mounting has one end and front side installation piece 9 swing joint's second installation axle 11, the rear side fixed mounting of front side installation piece 9 has the second bearing, second installation axle 11 passes through the second and rotates with front side installation piece 9 to be connected, the outside fixed mounting of second installation axle 11 has feed adjustment wheel 12, the top fixed mounting of grinding machine body 2 has connecting block 13 that is located movable block 8 right side, the front and back both ends on connecting block 13 right side all fixed mounting pneumatic cylinder 14, the output of pneumatic cylinder 14 is 140L, the model that the output of two pneumatic cylinder 14 all extends to the left side of connecting block 13 and with movable block 8 fixed connection, the top fixed mounting of grinding machine body 2 has the grinding template that is located grinding wheel 7 left side and the top of grinding wheel 15 is located the grinding template that the side of grinding wheel 15L that extends.

Second through holes 17 have all been seted up to the inner wall left and right sides of grinding machine body 2, movable mounting has filter 18 between the inner wall front and back both sides of grinding machine body 2, the left and right both ends of filter 18 pass two second through holes 17 respectively and extend to the left and right sides of grinding machine body 2 respectively, the top of filter 18 is the slope design, the inner wall left and right sides of grinding machine body 2 is all fixed mounting has the fixed block 19 that is located filter 18 below, the bottom of two fixed blocks 19 all movable mounting has the gag lever post 20 that one end extends to its top and with filter 18 bottom fixed connection, the equal fixed mounting in top of two fixed blocks 19 has the reset spring 21 of cover in the outside of two gag lever posts 20 respectively and one end and filter 18 bottom fixed connection.

The left and right sides of the grinding machine body 2 are fixedly provided with L-shaped blocks 22 positioned below the filter plates 18, opposite sides of the two L-shaped blocks 22 are movably provided with rotating shafts 23 with one ends extending to the inside of the grinding machine body 2, the outer sides of the two rotating shafts 23 are fixedly provided with cams 24 positioned inside the grinding machine body 2 and positioned between the filter plates 18 and the fixed blocks 19, and the left and right sides of the bottom of the filter plates 18 are fixedly provided with pulleys 25 respectively positioned above the two cams 24.

The drive assembly 26 with one end fixedly connected with the inner bottom wall is movably mounted between the left side and the right side of the inner wall of the frame body 1, the drive assembly 26 comprises a double-shaft drive motor 261, the double-shaft drive motor 261 is fixedly mounted on the inner bottom wall of the frame body 1, YSK78-4J is arranged on the model of the double-shaft drive motor 261, two support blocks 262 which are respectively positioned on the left side and the right side of the double-shaft drive motor 261 are fixedly mounted on the inner bottom wall of the frame body 1, transmission shafts 263 with one ends respectively extending to the opposite sides of the two support blocks 262 and respectively movably connected with the left side and the right side of the inner wall of the frame body 1 are fixedly mounted on the left side and the right side of the output shaft of the double-shaft drive motor 261, and mounting holes matched with the transmission shafts 263 are respectively formed in the two support blocks 262.

The left and right ends outside the driving component 26 are fixedly provided with driving components 27, one ends of the driving components 27 are respectively fixedly connected with the outer sides of the two rotating shafts 23, the driving components 27 comprise first belt pulleys 271, the outer sides of the two driving shafts 263 are fixedly provided with first belt pulleys 271 which are respectively positioned on the opposite sides of the two supporting blocks 262, the outer sides of the two rotating shafts 23 are fixedly provided with second belt pulleys 272 which are respectively positioned on the left side and the right side of the grinding machine body 2, the outer sides of the two first belt pulleys 271 are respectively connected with belts 273, one ends of the two belts 273 are respectively connected with the outer sides of the two second belt pulleys 272 in a transmission mode, perforations are respectively formed in the left side and the right side of the inner top wall of the frame body 1, and one ends of the two belts 273 respectively penetrate through the two perforations to extend to the upper portion of the frame body 1.

The left side fixed mounting of L template 15 has one end and shower nozzle 16 fixed connection and the other end extends to the inside conveying component 28 of grinding machine body 2, and conveying component 28 includes water pump 281, and the left side fixed mounting of L template 15 has water pump 281, and the model of water pump 281 is HQB-2000, and the play water end fixed mounting of water pump 281 has one end to extend to L template 15 right side and with shower nozzle 16 fixed connection's raceway 282, and the water inlet end fixed mounting of water pump 281 has one end to extend to the inside water suction pipe 283 of grinding machine body 2.

When in use, a certain amount of water can be injected into the grinder body 2 through the first through hole 6, then the external controller starts the two hydraulic cylinders 14 to drive the movable block 8 and the feeding adjustment wheel 12 to integrally move leftwards, the first driving motor 4 is started to drive the grinding wheel 7 to rotate, the second driving motor 10 is started to drive the feeding adjustment wheel 12 to rotate, so as to polish bearing parts, the water pump 281 can be started to convey the water in the grinder body 2 to the inside of the spray head 16 and then to spray the water onto the bearing to perform dust fall and temperature reduction operation, then the filter plate 18 can filter the sewage after dust fall and temperature reduction of the centerless grinder, so that metal scraps are accumulated at the top of the filter plate 18, the filtered water can return to the inside of the grinder body 2, so that water resources are recycled, and at the same time, the two driving shafts 263 and the two first pulleys 271 can be driven to rotate by starting the double-shaft driving motor 261, the two rotating shafts 23 and the two cams 24 can be driven to rotate by the two belts 273 and the two second pulleys 272, the cams 24 can squeeze the pulleys 25 in the rotating process so as to drive the filter plate 18 to move upwards, then the cams 24 can release the squeezing of the pulleys 25, at the moment, the filter plate 18 can move down rapidly to strike the inner bottom wall of the second through hole 17 under the action of the elasticity and gravity of the return spring 21, then the cams 24 can squeeze the pulleys 25 again, and thus the filter plate 18 can reciprocate up and down, the filter plate 18 can vibrate through continuous striking, thus the condition that the filter plate 18 is blocked is avoided, and secondly, by setting the top of the filter plate 18 to be inclined, and then can make the metal sweeps that the filter 18 top piled up roll off left and right sides under the vibrations effect, discharge through two second through-holes 17 to accomplish the clearance operation voluntarily in this, made things convenient for user's use.

In summary, the centerless grinder for processing space parts is provided with the filter plate 18 to filter the sewage after dust fall and temperature reduction of the centerless grinder, so that metal scraps are accumulated on the top of the filter plate 18, the filtered water is accumulated on the inner bottom wall of the grinder body 2, when the dust fall and temperature reduction operation is required, the water pump 281 can be started to convey the water in the grinder body 2 to the inside of the spray head 16 to perform the dust fall and temperature reduction operation, so as to recycle the water resource, meanwhile, the two transmission shafts 263 and the two first pulleys 271 can be driven to rotate by starting the double-shaft driving motor 261, the two rotary shafts 23 and the two cams 24 are driven to rotate by the two belts 273 and the two second pulleys 272, and the cams 24 squeeze the pulleys 25 in the rotating process to drive the filter plate 18 to move upwards, the cam 24 will release the extrusion to the pulley 25 at this moment, under the elasticity and gravity of the return spring 21, the filter plate 18 will move down rapidly to impact the inner bottom wall of the second through hole 17, then the cam 24 will extrude the pulley 25 again, thus reciprocating the filter plate 18 up and down, the filter plate 18 will vibrate through continuous impact, thus avoiding the situation of blocking the filter plate 18, secondly, by setting the top of the filter plate 18 to be inclined, the metal scraps accumulated on the top of the filter plate 18 will roll down to the left and right sides under the vibration effect, and be discharged through the two second through holes 17, thus automatically completing the cleaning operation, facilitating the use of users, solving the problem that in the actual operation process, when the bearing parts are processed through the centerless grinder, dust fall and temperature reduction treatment needs to be carried out on the processing parts, and the sewage after dust fall and temperature reduction treatment is not recycled, so that the problem of water resource waste is caused.

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

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

Claims

1. The utility model provides a spaceflight parts processing centerless grinder, includes framework (1), the top of framework (1) is provided with grinding machine body (2), both sides all are provided with mounting panel (3) around the top of grinding machine body (2), the rear side of mounting panel (3) is provided with first driving motor (4), the output shaft of first driving motor (4) extends to the front side of rear side mounting panel (3) and is provided with one end and front side mounting panel (3) swing joint's first installation axle (5), the top of grinding machine body (2) is provided with first through-hole (6) that are located first installation axle (5) below, the outside of first installation axle (5) is provided with one end and passes first through-hole (6) and extend to grinding wheel (7) inside grinding machine body (2), the top of grinding machine body (2) is provided with movable block (8) that are located grinding wheel (7) right side, both sides all are provided with installation piece (9) around the top of movable block (8) the rear side motor (9) the second driving motor (10) is provided with one end (10) and is installed to the front side of second driving motor (9) and is connected to front side (10), the outside of second installation axle (11) is provided with feed adjustment wheel (12), the top of grinding machine body (2) is provided with connecting block (13) that are located movable block (8) right side, both ends all are provided with pneumatic cylinder (14) around connecting block (13) right side, two the output of pneumatic cylinder (14) all extends to the left side of connecting block (13) and with the right side fixed connection of movable block (8), the top of grinding machine body (2) is provided with L template (15) that are located grinding wheel (7) left side and one end extends to grinding wheel (7) top, the bottom of L template (15) is provided with shower nozzle (16) that are located grinding wheel (7) top, its characterized in that: the utility model discloses a grinding machine, including grinding machine body (2), filter (18) are provided with between the inner wall front and back both sides of grinding machine body (2), the left and right sides of filter (18) pass two second through-holes (17) respectively and extend to the left and right sides of grinding machine body (2) respectively, the inner wall left and right sides of grinding machine body (2) all is provided with fixed block (19) that are located filter (18) below, two the bottom of fixed block (19) all is provided with gag lever post (20) that one end extends to its top and with filter (18) bottom fixed connection, two the top of fixed block (19) all is provided with reset spring (21) of cover in two gag lever post (20) outsides and one end and filter (18) bottom fixed connection respectively, the left and right sides of grinding machine body (2) all is provided with L type piece (22) that are located filter (18) below, two the opposite sides of L type piece (22) all are provided with one end and extend to fixed block (23) inside grinding machine body (18), two pivot (23) and two are located inside of grinding machine body (18) and fixed block (23) are located between fixed (24), the left and right sides of the bottom of filter (18) all are provided with pulley (25) that are located two cams (24) top respectively, be provided with between the inner wall left and right sides of framework (1) one end and its interior diapire fixed connection's drive assembly (26), both ends all are provided with one end respectively with two pivot (23) outside fixed connection's drive assembly (27) about drive assembly (26) outside, the left side of L template (15) is provided with one end and shower nozzle (16) fixed connection and the other end extends to inside conveying assembly (28) of grinding machine body (2).

2. The aerospace part machining centerless grinder of claim 1, wherein: the driving assembly (26) comprises a double-shaft driving motor (261), the double-shaft driving motor (261) is fixedly arranged on the inner bottom wall of the frame body (1), two supporting blocks (262) which are respectively positioned on the left side and the right side of the double-shaft driving motor (261) are fixedly arranged on the inner bottom wall of the frame body (1), and one ends of transmission shafts (263) which are respectively extended to the opposite sides of the two supporting blocks (262) and are respectively movably connected with the left side and the right side of the inner wall of the frame body (1) are fixedly arranged on the left output shaft and the right output shaft of the double-shaft driving motor (261).

3. A aerospace part machining centerless grinder according to claim 2, wherein: the transmission assembly (27) comprises a first belt pulley (271), the outer sides of the two transmission shafts (263) are fixedly provided with the first belt pulleys (271) which are respectively positioned on the opposite sides of the two supporting blocks (262), the outer sides of the two rotating shafts (23) are fixedly provided with second belt pulleys (272) which are respectively positioned on the left side and the right side of the grinding machine body (2), and the outer sides of the two first belt pulleys (271) are respectively in transmission connection with a belt (273) of which one end is respectively in transmission connection with the outer sides of the two second belt pulleys (272).

4. The aerospace part machining centerless grinder of claim 1, wherein: the conveying assembly (28) comprises a water pump (281), the water pump (281) is fixedly arranged on the left side of the L-shaped plate (15), one end of the water pipe (282) extending to the right side of the L-shaped plate (15) and fixedly connected with the spray head (16) is fixedly arranged at the water outlet end of the water pump (281), and one end of the water pipe (283) extending to the inside of the grinding machine body (2) is fixedly arranged at the water inlet end of the water pump (281).

5. The aerospace part machining centerless grinder of claim 1, wherein: the front side the rear side of mounting panel (3) fixed mounting has first bearing, first installation axle (5) are connected with front side mounting panel (3) rotation through first bearing.

6. The aerospace part machining centerless grinder of claim 1, wherein: the rear side of the front side mounting block (9) is fixedly provided with a second bearing, and the second mounting shaft (11) is rotatably connected with the front side mounting block (9) through the second bearing.