CN112240024B

CN112240024B - Underground soil taking system

Info

Publication number: CN112240024B
Application number: CN202010947890.2A
Authority: CN
Inventors: 罗成名; 曹开伟; 冯上涛; 罗鹏; 孙旭辉; 谭永强
Original assignee: Jiangxi Zhongheng Underground Space Technology Co ltd
Current assignee: Jiangxi Zhongheng Underground Space Technology Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2022-02-18
Anticipated expiration: 2040-09-10
Also published as: CN112240024A

Abstract

The application relates to an underground soil taking system which comprises a base, two supporting frames fixed at the top of the base and turntables respectively rotatably arranged at the opposite inner sides of the two supporting frames; a first supporting rod is fixed at the top of the base, an installation pipe is fixed at the top of the first supporting rod, and an internal threaded pipe is rotatably installed in the installation pipe; a lead screw is rotatably arranged in the internal thread pipe, and a drill bit is rotatably arranged at the end part of the lead screw; the top of the base is provided with a driving device for driving the screw rod to move towards one side close to the drill bit; one side of one of them carousel is close to another carousel has a plurality of boxes that dig along carousel circumference equipartition, and every box that digs all is close to another carousel one side with the carousel and articulates. This application has the effect that is convenient for excavating gear gos forward.

Description

Underground soil taking system

Technical Field

The application relates to the field of reverse construction method construction, in particular to an underground soil taking system.

Background

At present, the top-down construction technology is to construct an underground continuous wall supporting structure along the outer wall of a basement of a building before excavation of a foundation pit, construct a pile foundation, pour a reinforced concrete column, install a steel column butted with the concrete column or the pile foundation, construct a first floor, and connect the underground continuous wall, the pile foundation and the column together through the first floor. The soil needs to be excavated underground during the reverse construction process.

In the prior art, reference may be made to chinese patent invention with an authorization publication number of CN103670434A, which discloses an underground pipeline excavating device, comprising a machine body, wherein wheels respectively driven by a second driving device are arranged on the outer circumferential surface of the machine body; the front end of the machine body is provided with a guide rail which is driven by a first driving device to rotate positively and negatively. And two sides of the machine body are respectively provided with a cutter head driven by a third driving device. The outer peripheral surface of the cutter head is provided with a scraper which is driven to rotate by a fourth driving device. The underground pipe excavating device excavates underground soil by rotating the cutter head, however, when the excavating device works, a large amount of excavated soil is accumulated in front of the excavating device, thereby influencing the advance of the excavating device.

In view of the above-described related art, the inventors consider that there is a drawback that affects the advancement of the excavating device.

Disclosure of Invention

To facilitate advancement of the excavation apparatus, an underground earthmoving system is provided.

The application provides an underground borrowing system adopts following technical scheme:

an underground soil taking system comprises a base, two support frames fixed at the top of the base and turntables respectively rotatably arranged at the opposite inner sides of the two support frames; a first supporting rod is fixed at the top of the base, an installation pipe is fixed at the top of the first supporting rod, and an internal threaded pipe is rotatably installed in the installation pipe; a lead screw is rotatably arranged in the inner threaded pipe, and a drill bit is rotatably arranged at the end part of the lead screw; the top of the base is provided with a driving device for driving the screw rod to move towards one side close to the drill bit; one side of one of them carousel is close to another carousel has a plurality of boxes that dig along carousel circumference equipartition, every dig the box and all be close to another carousel one side with the carousel and articulate.

Through adopting above-mentioned technical scheme, the soil stone and the grit after the drill bit is dug can be piled up in base the place ahead, and through rotating the carousel, the box splendid attire soil stone and grit of digging rotate to the rear. Through setting up carousel and soil box, be convenient for clear up the soil in system the place ahead of fetching earth, reduce the soil influence of excavation and fetch earth the system and continue the possibility that gos forward.

Preferably, the driving device comprises a second supporting rod fixed on the top of the base and a connecting box fixed on the top of the second supporting rod; one side of the connecting box, which is close to the drill bit, is provided with an installation through hole for penetrating a lead screw; one side of the connecting box, which is close to the drill bit, is provided with two first sliding chutes; a plug connector is arranged in the first sliding groove of each connecting box in a sliding manner along the axial direction of the rotary table; the outer peripheral surface of the screw rod is provided with two strip-shaped slots which are respectively used for being plugged with the plug connectors along the axial direction of the screw rod; a second spring is fixed on one side of the connecting box, which is close to the drill bit, and a sliding plate is fixed on one side of the second spring, which is far away from the plug connector; two abutting parts which are respectively used for being inserted into the first sliding groove are fixed on one side of the sliding plate, which is far away from the drill bit; the opposite inner sides of each abutting connection piece and the plug connector are respectively provided with a first inclined plane; and a pressure plate used for pressing the sliding plate against one side far away from the drill bit is fixed on the peripheral surface of the screw rod.

By adopting the technical scheme, as the plug connector is plugged with the strip-shaped slot, the screw rod can drive the drill bit to move after the internal thread pipe rotates; when the pressure plate moves to the back of butt with the shifting board, the pressure plate can support and press the shifting board to promote the shifting board to move to one side near the connecting box. In the moving process of the sliding plate, the abutting part is inserted into the first sliding groove, abuts against the plug connector through the first inclined surface and pushes the plug connector to move towards one side far away from the screw rod; and after the plug connector is separated from the strip-shaped slot, the strip-shaped slot stops moving. The drill bit is driven by the lead screw to move in the direction opposite to the advancing direction of the soil taking system, so that the turntable is convenient to approach excavated soil and stones, and the soil and stones are convenient to clean through the soil digging box; through setting up drive arrangement, be convenient for restrict the displacement of lead screw.

Preferably, each plug connector is fixed with a first spring on one side thereof away from the lead screw, and each first spring on one side thereof away from the lead screw is fixedly connected with one side thereof away from the lead screw via a first sliding groove.

Through adopting above-mentioned technical scheme, the plug connector is in compression state with the bar slot after the separation, and first spring is applyed to the plug connector to the elasticity that is close to bar slot one side, is convenient for reset to being close to bar slot one side through first spring drive plug connector.

Preferably, the top of the base is provided with a driving mechanism for driving the internal threaded pipe to rotate; the driving mechanism comprises a motor fixed at the top of the base and a first belt wheel fixed at the output end of the motor; the top of the mounting pipe is rotatably provided with a second belt wheel; a sleeve ring is fixed at the top of each second supporting rod, and a third belt wheel is rotatably arranged in each sleeve ring; a driven assembly for driving the rotary table to rotate is arranged between each third belt wheel and the plug connector; a first bevel gear is fixed at the bottom of the second belt wheel, and a second bevel gear meshed with the first bevel gear is fixed on one side, close to the first bevel gear, of the internal threaded pipe.

Through adopting above-mentioned technical scheme, the motor drives first band pulley and rotates the back, and two third band pulleys and second band pulley rotation are driven respectively to first band pulley. After the second belt wheel rotates, the first bevel gear drives the second bevel gear to rotate, so that the internal threaded pipe rotates. Through setting up actuating mechanism, be convenient for carry out work through motor drive lead screw and carousel, effectively improve the work efficiency of motor.

Preferably, each group of driven assemblies comprises an inserting disc fixed on one side of the rotary disc close to the third belt wheel, a circular groove arranged on one side of the third belt wheel close to the rotary disc and used for inserting with the inserting disc, a guide shaft fixed on one side of the inserting piece far away from the screw rod and a guide through hole arranged on one side of the first sliding groove far away from the installation through hole; the guide shaft is arranged in the guide through hole in a sliding manner along the axial direction of the turntable; two second sliding grooves are formed in the plug-in tray, and a plug-in strip for being plugged with the inner peripheral surface of the circular groove is arranged in each second sliding groove in a sliding manner along the radial direction of the plug-in tray; and a pressing component used for driving the inserting strips to move towards one side far away from the guide shaft is arranged between each inserting strip and the guide shaft.

Through adopting above-mentioned technical scheme, the plug connector is to keeping away from lead screw one side removal back, and the guiding axle removes to keeping away from guiding axle one side respectively through two grafting strips of support pressure subassembly drive to make grafting strip peg graft with circular slot inner peripheral surface, and then drive the plug tray through the third band pulley and rotate. Through setting up driven subassembly, the carousel begins to rotate after the lead screw of being convenient for stops to remove, controls carousel and lead screw through the motor, further improves the work efficiency of motor.

Preferably, each group of the abutting assemblies comprises a circular truncated cone fixed on one side of the guide shaft close to the third belt wheel and a second inclined plane arranged on one side of the inserting strip close to the guide shaft.

Through adopting above-mentioned technical scheme, the guiding axle passes through the round platform and second inclined plane butt, is convenient for remove through the guiding axle and promotes two grafting strips and remove to keeping away from guiding axle one side respectively.

Preferably, the slip sheets are fixed to two sides of the inserting strip respectively, the third sliding grooves are formed in two sides of the second sliding groove respectively, and each slip sheet is connected with the third belt wheel in a sliding mode along the radial direction of the third belt wheel through the third sliding groove.

Through adopting above-mentioned technical scheme, the third spout provides the guide effect for the gleitbretter, reduces the grafting strip along the orbital possibility of deviating from of third band pulley radial movement in-process.

Preferably, a third spring is fixed on one side, away from the guide shaft, of each sliding piece, and one side, away from the sliding piece, of each third spring is fixedly connected with one side, close to the guide shaft, of each third sliding groove.

Through adopting above-mentioned technical scheme, the grafting strip is to keeping away from guiding axle one side back that removes, and the third spring is in compression state, and the third spring is applyed to the gleitbretter to being close to the elasticity of guiding axle one side, is convenient for reset to being close to guiding axle one side through the drive of third spring grafting strip.

To sum up, this application includes following at least one kind underground and fetches earth system beneficial technical effect:

by arranging the rotary disc and the soil digging box, the soil in front of the soil taking system is convenient to clean, and the possibility that the excavated soil influences the continuous advancing of the soil taking system is reduced;

the drill bit is driven by the lead screw to move in the direction opposite to the advancing direction of the soil taking system, so that the turntable is convenient to approach excavated soil and stones, and the soil and stones are convenient to clean through the soil digging box; the driving device is arranged, so that the moving distance of the lead screw is convenient to limit;

through setting up driven subassembly, the carousel begins to rotate after the lead screw of being convenient for stops to remove, controls carousel and lead screw through the motor, further improves the work efficiency of motor.

Drawings

FIG. 1 is a partial cross-sectional view of an underground borrowing system according to an embodiment of the application.

Fig. 2 is an enlarged schematic view of the application at a in fig. 1.

Fig. 3 is a schematic structural view of the second pulley according to the embodiment of the present application.

Description of reference numerals: 1. a base; 11. a support frame; 12. a turntable; 13. a wheel; 14. a first support bar; 15. a lead screw; 16. a drill bit; 17. a motor; 2. a drive device; 21. a second support bar; 22. a connection box; 23. mounting a through hole; 24. a first chute; 25. a plug-in unit; 26. a strip-shaped slot; 27. a first spring; 28. a second spring; 29. a slide plate; 3. a platen; 31. an abutting member; 32. a first inclined plane; 33. sliding blades; 34. an internally threaded tube; 35. a third spring; 36. a first bevel gear; 37. a second bevel gear; 4. a drive mechanism; 41. a first pulley; 42. installing a pipe; 43. a second pulley; 44. a collar; 45. a third belt pulley; 46. a conveyor belt; 5. a driven assembly; 51. a plug-in tray; 52. a circular groove; 53. a guide shaft; 54. a guide through hole; 55. digging a soil box; 56. a second chute; 57. inserting strips; 58. a circular truncated cone; 59. a second inclined plane.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses underground borrowing system. Referring to fig. 1, the underground soil sampling system includes a base 1, two support frames 11 fixed on the top of the base 1, and turntables 12 rotatably installed on the opposite inner sides of the two support frames 11, respectively. Two wheels 13 are respectively arranged on two sides of the base 1. The top of the base 1 is fixed with a first supporting rod 14, the top of the first supporting rod 14 is fixed with a mounting tube 42, and the mounting tube 42 is rotatably provided with an internal threaded tube 34; the threaded pipe 34 is rotatably provided with a lead screw 15, and the end of the lead screw 15 is rotatably provided with a drill 16. The top of the base 1 is provided with a driving device 2 for driving the screw rod 15 to move towards the side close to the drill bit 16. One side of one of the turntables 12 close to the other turntable 12 is evenly provided with a plurality of soil digging boxes 55 along the circumferential direction of the turntable 12, and each soil digging box 55 is hinged with one side of the turntable 12 close to the other turntable 12. The earth and gravel dug by the drill bit 16 are piled up in front of the base 1, and the earth box 55 is rotated backward while containing the earth and gravel by rotating the turntable 12. By arranging the transmission device behind the underground soil taking system, the soil box 55 is convenient to throw earth and stones and gravel onto the transmission device, so that the excavation operation is performed.

Referring to fig. 1 and 2, the driving device 2 includes a second support bar 21 fixed to the top of the base 1 and a connection box 22 fixed to the top of the second support bar 21. The connecting box 22 is provided with an installation through hole 23 for the lead screw 15 to pass through on one side close to the drill 16. The connecting box 22 is provided with two first sliding chutes 24 which are respectively communicated with the mounting through holes 23 at one side close to the drill bit 16. A plug connector 25 is slidably arranged in the first sliding slot 24 of each connecting box 22 along the axial direction of the rotating disc 12. Two strip-shaped slots 26 which are respectively used for being plugged with the plug connectors 25 are formed in the outer peripheral surface of the screw rod 15 along the axial direction of the screw rod 15. And a first spring 27 is fixed on one side, away from the lead screw 15, of each plug connector 25, and one side, away from the lead screw 15, of each first spring 27 is fixedly connected with one side, away from the lead screw 15, of each first sliding groove 24. The side of the connecting box 22 close to the drill 16 is fixed with a second spring 28, and the side of the second spring 28 far from the plug 25 is fixed with a sliding plate 29. Two abutting pieces 31 which are respectively used for being inserted into the first sliding chute 24 are fixed on one side, away from the drill bit 16, of the sliding plate 29. The opposite inner sides of each abutting piece 31 and the plug piece 25 are respectively provided with a first inclined surface 32. The outer peripheral surface of the screw 15 is fixed with a pressure plate 3 for pressing the sliding plate 29 to the side far away from the drill 16. Because the plug connector 25 is plugged with the strip-shaped slot 26, the screw 15 drives the drill bit 16 to move after the internal thread tube 34 rotates; when the pressure plate 3 moves to abut against the sliding plate 29, the pressure plate 3 will abut against the sliding plate 29 and push the sliding plate 29 to move toward the side close to the connecting box 22. In the moving process of the sliding plate 29, the abutting piece 31 is inserted into the first sliding groove 24, the abutting piece 31 abuts against the plug-in piece 25 through the first inclined surface 32, and the plug-in piece 25 is pushed to move to the side far away from the screw rod 15; after the plug 25 is separated from the bar slot 26, the bar slot 26 stops moving.

Referring to fig. 1 and 3, a driving mechanism 4 for driving the internal threaded pipe 34 to rotate is arranged at the top of the base 1. The driving mechanism 4 comprises a motor 17 fixed on the top of the base 1 and a first belt pulley 41 fixed on the output end of the motor 17. The top of the mounting tube 42 is rotatably mounted with a second pulley 43. A lantern ring 44 is fixed at the top of each second support rod 21, and a third belt wheel 45 is rotatably installed in each lantern ring 44. The outer peripheral surface of the first pulley 41 is sleeved with a transmission belt 46, and the transmission belt passes through the third pulley 45 and the second pulley 43 in sequence, then passes through the other third pulley 45 and returns to the first pulley 41. A driven assembly 5 for driving the rotary disc 12 to rotate is arranged between each third belt wheel 45 and the plug 25. After the motor 17 drives the first belt pulley 41 to rotate, the first belt pulley 41 drives the two third belt pulleys 45 and the second belt pulley 43 to rotate respectively. A first bevel gear 36 is fixed at the bottom of the second belt pulley 43, and a second bevel gear 37 for meshing with the first bevel gear 36 is fixed on one side of the internal thread pipe 34 close to the first bevel gear 36. After the second pulley 43 rotates, the second bevel gear 37 is rotated by the first bevel gear 36, so that the internally threaded tube 34 rotates.

Referring to fig. 1 and 2, each set of driven assemblies 5 includes a plug-in disc 51 fixed on one side of the rotary disc 12 close to the third belt wheel 45, a circular groove 52 formed on one side of the third belt wheel 45 close to the rotary disc 12 and used for being plugged with the plug-in disc 51, a guide shaft 53 fixed on one side of the plug-in unit 25 away from the screw rod 15, and a guide through hole 54 formed on one side of the first sliding groove 24 away from the installation through hole 23; the guide shaft 53 is slidably disposed in the guide through hole 54 along the axial direction of the turntable 12. Two second sliding grooves 56 are formed in the plug disc 51, and a plug strip 57 for plugging with the inner circumferential surface of the circular groove 52 is arranged in each second sliding groove 56 in a sliding manner along the radial direction of the plug disc 51. A circular truncated cone 58 is fixed on one side of the guide shaft 53 close to the third belt wheel 45; the opposite inner sides of the two insertion strips 57 are respectively provided with a second inclined surface 59 for abutting against the round platforms 58. Plug strip 57 both sides are fixed with gleitbretter 33 respectively, and the third spout has been seted up respectively to second spout 56 both sides, and every gleitbretter 33 all slides through the third spout and is connected with third band pulley 45 along third band pulley 45 radial sliding. And a third spring 35 is fixed on one side of each sliding sheet 33 far away from the guide shaft 53, and one side of each third spring 35 far away from the sliding sheet 33 is fixedly connected with one side of each third sliding chute close to the guide shaft 53. After the plug connector 25 moves to the side far away from the lead screw 15, the guide shaft 53 abuts against the second inclined surface 59 through the circular truncated cone 58, and pushes the two plug strips 57 to move to the side far away from the guide shaft 53 respectively, so that the plug strips 57 are plugged with the inner peripheral surface of the circular groove 52, and the plug tray 51 is driven to rotate through the third belt pulley 45.

The implementation principle of the underground soil taking system in the embodiment of the application is as follows:

after the second pulley 43 rotates, the second bevel gear 37 is rotated by the first bevel gear 36, so that the internally threaded tube 34 rotates. Because the plug connector 25 is plugged with the strip-shaped slot 26, the screw 15 drives the drill bit 16 to move after the internal thread tube 34 rotates; when the pressure plate 3 moves to abut against the sliding plate 29, the pressure plate 3 will abut against the sliding plate 29 and push the sliding plate 29 to move toward the side close to the connecting box 22. In the moving process of the sliding plate 29, the abutting piece 31 is inserted into the first sliding groove 24, the abutting piece 31 abuts against the plug-in piece 25 through the first inclined surface 32, and the plug-in piece 25 is pushed to move to the side far away from the screw rod 15; after the plug 25 is separated from the bar slot 26, the bar slot 26 stops moving. After the plug connector 25 moves towards the side far away from the lead screw 15, the guide shaft 53 abuts against the second inclined surface 59 through the circular truncated cone 58 and pushes the two plug strips 57 to move towards the side far away from the guide shaft 53 respectively, so that the plug strips 57 are plugged with the inner peripheral surface of the circular groove 52, and the plug disc 51 is driven to rotate through the third belt pulley 45, so that the rotary disc 12 rotates. By rotating the turntable 12, the soil box 55 is rotated backward while containing earth and gravel.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An underground borrowing system, which is characterized in that: comprises a base (1), two supporting frames (11) fixed on the top of the base (1) and turntables (12) respectively rotatably arranged on the opposite inner sides of the two supporting frames (11); a first supporting rod (14) is fixed to the top of the base (1), an installation pipe (42) is fixed to the top of the first supporting rod (14), and an internal threaded pipe (34) is rotatably installed in the installation pipe (42); a lead screw (15) is rotatably mounted in the internal threaded pipe (34), and a drill bit (16) is rotatably mounted at the end part of the lead screw (15); the top of the base (1) is provided with a driving device (2) for driving the screw rod (15) to move towards one side close to the drill bit (16); a plurality of soil digging boxes (55) are uniformly distributed on one side, close to the other rotary table (12), of one rotary table (12) along the circumferential direction of the rotary table (12), and each soil digging box (55) is hinged with one side, close to the other rotary table (12), of the rotary table (12);

the driving device (2) comprises a second supporting rod (21) fixed at the top of the base (1) and a connecting box (22) fixed at the top of the second supporting rod (21); one side of the connecting box (22) close to the drill bit (16) is provided with a mounting through hole (23) for penetrating the lead screw (15); one side of the connecting box (22) close to the drill bit (16) is provided with two first sliding chutes (24); a plug connector (25) is arranged in the first sliding groove (24) of each connecting box (22) in a sliding manner along the axial direction of the rotary disc (12); the outer peripheral surface of the screw rod (15) is provided with two strip-shaped slots (26) which are respectively used for being plugged with the plug connectors (25) along the axial direction of the screw rod (15); a second spring (28) is fixed on one side, close to the drill bit (16), of the connecting box (22), and a sliding plate (29) is fixed on one side, far away from the plug connector (25), of the second spring (28); two abutting parts (31) which are respectively used for being inserted into the first sliding groove (24) are fixed on one side, away from the drill bit (16), of the sliding plate (29); the opposite inner sides of each abutting part (31) and the plug-in connector (25) are respectively provided with a first inclined surface (32); and a pressure plate (3) which is used for pressing the sliding plate (29) to the side far away from the drill bit (16) is fixed on the peripheral surface of the screw rod (15).

2. An underground earthmoving system according to claim 1, characterized in that: every lead screw (15) one side is kept away from in plug connector (25) all is fixed with first spring (27), every lead screw (15) one side is kept away from in first spring (27) all with lead screw (15) one side fixed connection is kept away from in first spout (24).

3. An underground earthmoving system according to claim 1, characterized in that: the top of the base (1) is provided with a driving mechanism (4) for driving the internal threaded pipe (34) to rotate; the driving mechanism (4) comprises a motor (17) fixed at the top of the base (1) and a first belt wheel (41) fixed at the output end of the motor (17); a second belt wheel (43) is rotatably arranged at the top of the mounting pipe (42); a lantern ring (44) is fixed to the top of each second supporting rod (21), and a third belt wheel (45) is rotatably mounted in each lantern ring (44); a driven assembly (5) for driving the rotary disc (12) to rotate is arranged between each third belt wheel (45) and the plug connector (25); a first bevel gear (36) is fixed at the bottom of the second belt wheel (43), and a second bevel gear (37) meshed with the first bevel gear (36) is fixed on one side, close to the first bevel gear (36), of the internal threaded pipe (34).

4. An underground earthmoving system according to claim 3, characterized in that: each group of driven assemblies (5) comprises an inserting disc (51) fixed on one side, close to the third belt wheel (45), of the rotary disc (12), a circular groove (52) formed in one side, close to the rotary disc (12), of the third belt wheel (45) and used for being inserted into the inserting disc (51), a guide shaft (53) fixed on one side, far away from the screw rod (15), of the inserting piece (25) and a guide through hole (54) formed in one side, far away from the mounting through hole (23), of the first sliding groove (24); the guide shaft (53) is arranged in the guide through hole (54) in a sliding manner along the axial direction of the turntable (12); two second sliding grooves (56) are formed in the plug disc (51), and a plug strip (57) for being plugged with the inner circumferential surface of the circular groove (52) is arranged in each second sliding groove (56) in a sliding manner along the radial direction of the plug disc (51); and a pressing component for driving the inserting strips (57) to move towards one side far away from the guide shaft (53) is arranged between each inserting strip (57) and the guide shaft (53).

5. An underground earthmoving system according to claim 4, characterized in that: each group of the abutting components comprises a circular truncated cone (58) fixed on one side, close to the third belt wheel (45), of the guide shaft (53) and a second inclined surface (59) arranged on one side, close to the guide shaft (53), of the inserting strip (57).

6. An underground earthmoving system according to claim 4, characterized in that: plug-in strip (57) both sides are fixed with gleitbretter (33) respectively, the third spout has been seted up respectively to second spout (56) both sides, every gleitbretter (33) all through the third spout with third band pulley (45) are along the radial connection that slides of third band pulley (45).

7. An underground earthmoving system according to claim 6, characterized in that: every gleitbretter (33) keep away from guiding axle (53) one side all is fixed with third spring (35), every third spring (35) keep away from gleitbretter (33) one side all with third spout is close to guiding axle (53) one side fixed connection.