CN113492321A

CN113492321A - Digit control machine tool stand structure convenient to clearance

Info

Publication number: CN113492321A
Application number: CN202110811906.1A
Authority: CN
Inventors: 胡明洪; 吴晓东; 李琴; 毕维平
Original assignee: Anhui Sino Seiko Co ltd
Current assignee: Anhui Sino Seiko Co ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2021-10-12

Abstract

The invention relates to the technical field of numerical control machines, and discloses a numerical control machine tool column structure convenient to clean. The vertical column has the advantages of ingenious structure and convenience in use, the vertical column body adopts a bilateral symmetry large-span design, the bottom is closed compared with the traditional structure, the vertical column is more stable and convenient to clean, the bottom adopts a unique rib plate structure, the stability of integral operation is ensured, the inclined joint rib plate is adopted inside, the strength is ensured, meanwhile, materials are saved, the cost is controlled, the vertical column is convenient to move, the vertical column has a good damping effect, the noise is low, and the service life is long.

Description

Digit control machine tool stand structure convenient to clearance

Technical Field

The invention relates to the technical field of numerical control machine tools, in particular to a numerical control machine tool upright post structure convenient to clean.

Background

Machine tools are machines for manufacturing machines, also called machine tools or machine tools, which are conventionally referred to as machine tools for short. Generally, the machining method is divided into a metal cutting machine, a forging machine, a woodworking machine and the like. The methods for machining machine parts in modern machine manufacturing are numerous: in addition to cutting, casting, forging, welding, pressing, extruding, etc., however, in general, a part requiring high precision and fine surface roughness is finished by cutting on a machine tool. The machine tool plays an important role in the construction of national economy modernization.

The lathe stand is the important structure of lathe, plays lathe up-and-down motion and supporting role, and current lathe stand is open mostly, the unable convenient clearance iron fillings, and the stand is comparatively heavy, removes inconveniently, and the shock attenuation effect is poor, adds man-hour can produce great noise, and life is short.

Disclosure of Invention

The invention provides a numerical control machine tool upright post structure convenient to clean, which solves the problems in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a digit control machine tool stand structure convenient to clearance, includes the stand lathe bed, the stand lathe bed is closed structure, and the inside welding in both sides of stand lathe bed has side gusset structure, and the inside welding in bottom of stand lathe bed has bottom surface gusset structure, and the below of stand lathe bed is equipped with the supporting seat, and the shock attenuation landing leg is installed to the bottom of supporting seat, and the stand lathe bed can be dismantled with the supporting seat and be connected, and the bottom fixedly connected with supporting box of supporting seat, the output of supporting box are connected with the backup pad, and the universal wheel is all installed at four turnings in bottom of backup pad.

Preferably, four location inserted bars of bottom fixedly connected with of stand lathe bed, the top of supporting seat corresponds four location sleeves of position fixedly connected with location inserted bar, four location inserted bars correspond respectively and extend to four location sleeves in, a side correspondence of every location inserted bar is provided with a fixed riser, slidable mounting has "L" shape setting element between the top of supporting seat lies in fixed riser and the location inserted bar, set up the constant head tank that matches with the setting element on the location inserted bar, the setting element passes the location sleeve outer wall and extends to in the constant head tank, one side rotation that fixed riser is close to the setting element installs one-way threaded rod, one side fixedly connected with thread bush that the setting element is close to fixed riser, one-way threaded rod and thread bush screw-thread fit.

Preferably, the top end of the supporting seat is provided with a sliding groove, a guide block is arranged in the sliding groove in a sliding mode, and the top end of the guide block is fixedly connected with the bottom end of the positioning piece.

Preferably, the one end fixedly connected with driven bevel gear that the outside of one-way threaded rod is close to first fixed riser, and one side that first fixed riser is close to one-way threaded rod is close to the top position and rotates and install vertical pivot, and the bottom fixedly connected with drive bevel gear of vertical pivot, drive bevel gear and driven bevel gear meshing, the top fixedly connected with of vertical pivot rotate the handle, rotate the outside of handle and install the rubber sleeve.

Preferably, damping leg is equipped with four, and four damping leg distribute in four turnings in the bottom of supporting seat, correspond the position with damping leg on the supporting seat and seted up the guiding hole, and damping leg's top is passed through the guiding hole and is extended to the first locating part of top and fixedly connected with of supporting seat, and damping leg's the outside is located the below fixedly connected with second locating part of supporting seat, and damping leg's outside cover is equipped with first damping spring, and first damping spring's top is contradicted with the supporting seat, and first damping spring's bottom is contradicted with the second locating part.

Preferably, the side fixedly connected with second fixed riser of supporting seat, there is the slider supporting seat through slide rail slidable mounting, it has the connecting rod to articulate between the bottom of slider and the shock attenuation landing leg, the slider is close to the first guide bar of one side fixedly connected with of the fixed riser of second, the one end activity that the slider was kept away from to first guide bar runs through the fixed riser of second, the outside cover of first guide bar is equipped with second damping spring, second damping spring's one end is contradicted with the slider, second damping spring's the other end is contradicted with the fixed riser of second.

Preferably, rotate between the both sides inner wall of support case and install two-way threaded rod, two movable blocks are installed to the outside screw thread of two-way threaded rod, the top inner wall sliding connection of movable block and support case, the outside of two-way threaded rod is located the driven circular gear of intermediate position fixedly connected with, fixed mounting has the rotating electrical machines on the bottom inner wall of support case, the output shaft fixedly connected with of rotating electrical machines initiative circular gear, initiative circular gear and driven circular gear meshing, the bottom of movable block articulates there is the bracing piece, the bottom of bracing piece is seted up the opening through support bottom of the case and is extended to the outside of support case and articulated with the top of backup pad.

Preferably, the inner wall of the top end of the supporting box is fixedly connected with a guide rail, and the moving block is slidably mounted on the guide rail.

Preferably, four corners on the top end of the supporting plate are fixedly connected with second guide rods, the outer side of the supporting box is fixedly connected with guide sleeves corresponding to the second guide rods, and the top ends of the second guide rods extend into the guide sleeves.

The invention has the beneficial effects that:

1. the column body adopts a bilateral symmetry large-span design, the bottom is closed compared with the traditional structure, more stable and convenient to clean, the bottom adopts a unique rib plate structure, the stability of the whole operation is ensured, the strength is ensured by adopting the oblique rib plates in the interior, meanwhile, the material is saved, and the cost is controlled;

2. through the detachable design of the upright post lathe bed and the supporting seat, when the one-way threaded rod rotates, the threaded sleeve can be pushed to move horizontally, and then the positioning piece can be pushed to move horizontally, the positioning piece can be inserted into the positioning groove to lock the positioning inserted rod, so that the upright post lathe bed can be stably fixed at the top end of the supporting seat, the assembly and disassembly are convenient, and compared with the fixation of a traditional bolt nut, the upright post lathe bed can be more conveniently overhauled and maintained;

3. through the design of the damping supporting legs, vibration generated when a processing machine works on the vertical column bed body can be buffered and absorbed through the first damping spring, the damping effect is good, further, when the damping supporting legs slide up and down in the guide holes, the connecting rods can rotate and push the sliding blocks to move horizontally, the first guide rods are further pushed to move horizontally and compress the second damping springs, the damping effect is further improved, the capacity of absorbing vibration is enabled to be generated, vibration borne by the vertical column bed body is reduced, noise is weakened, and the service life of the vertical column bed body is prolonged;

4. through the design of supporting box, the rotating electrical machines can drive initiative circular gear and rotate, rethread initiative circular gear can drive the two-way threaded rod with driven circular gear meshing and rotate, and then can drive two movable blocks and be close to each other or keep away from the removal each other, the direction of rotation that depends on the two-way threaded rod, can promote the direction that the supporting box was kept away from to the backup pad orientation downwards through the bracing piece when two movable blocks are close to each other and remove, thereby make universal wheel and ground contact, and get up the stand lathe bed support, make the shock attenuation landing leg keep away from ground, make the stand lathe bed can be convenient remove through the universal wheel, when need not to remove, can support through the shock attenuation landing leg, can play good shock attenuation effect.

The vertical column has the advantages of ingenious structure and convenience in use, the vertical column body adopts a bilateral symmetry large-span design, the bottom is closed compared with the traditional structure, the vertical column is more stable and convenient to clean, the bottom adopts a unique rib plate structure, the stability of integral operation is ensured, the inclined joint rib plate is adopted inside, the strength is ensured, meanwhile, materials are saved, the cost is controlled, the vertical column is convenient to move, the vertical column has a good damping effect, the noise is low, and the service life is long.

Drawings

FIG. 1 is a front view of a column structure of a numerically controlled machine tool convenient to clean according to the present invention.

FIG. 2 is a B-B position cross-sectional view of a numerically controlled machine tool column structure convenient to clean according to the present invention.

FIG. 3 is a sectional view taken along the A-A position of the column structure of the numerically controlled machine tool, which is provided by the invention and is convenient to clean.

Fig. 4 is an enlarged cross-sectional view of the C position of the column structure of the numerically controlled machine tool convenient for cleaning according to the present invention.

Fig. 5 is an enlarged cross-sectional view of the position D of the column structure of the numerically controlled machine tool convenient for cleaning according to the present invention.

FIG. 6 is an enlarged sectional view of a supporting box of a column structure of a numerically controlled machine tool convenient to clean according to the present invention.

Reference numbers in the figures: 1. a column bed body; 2. a supporting seat; 3. a shock-absorbing leg; 4. a support box; 5. a support plate; 6. a universal wheel; 7. a second guide bar; 8. a guide sleeve; 9. a positioning sleeve; 10. positioning the inserted rod; 11. a side rib plate structure; 12. a bottom surface rib plate structure; 13. a guide hole; 14. a first limit piece; 15. a second limiting member; 16. a first damping spring; 17. a slide rail; 18. a slider; 19. a connecting rod; 20. a first guide bar; 21. a second fixed vertical plate; 22. a second damping spring; 23. a first fixed vertical plate; 24. a support bar; 25. an opening; 26. a positioning member; 27. a guide block; 28. a sliding groove; 29. positioning a groove; 30. a threaded sleeve; 31. a one-way threaded rod; 32. a driven bevel gear; 33. a vertical rotating shaft; 34. a drive bevel gear; 35. rotating the handle; 36. a rubber sleeve; 37. a bidirectional threaded rod; 38. a moving block; 39. a guide rail; 40. a driven circular gear; 41. a rotating electric machine; 42. a driving circular gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

Referring to fig. 1-6, a numerical control machine tool column structure convenient to clean comprises a column bed body 1, wherein the column bed body 1 is of a closed structure, side rib plate structures 11 are welded inside two sides of the column bed body 1, a bottom rib plate structure 12 is welded inside the bottom end of the column bed body 1, a support seat 2 is arranged below the column bed body 1, a shock absorption leg 3 is arranged at the bottom end of the support seat 2, the column bed body 1 is detachably connected with the support seat 2, a support box 4 is fixedly connected to the bottom end of the support seat 2, a support plate 5 is connected to the output end of the support box 4, a second guide rod 7 is fixedly connected to four corners at the top end of the support plate 5, a guide sleeve 8 corresponding to the second guide rod 7 is fixedly connected to the outer side of the support box 4, the top end of the second guide rod 7 extends into the guide sleeve 8, and universal wheels 6 are respectively arranged at four corners at the bottom end of the support plate 5, supporting box 4 can drive 5 orientation of backup pad and remove towards the direction of keeping away from supporting box 4 to make universal wheel 6 and ground contact, and get up stand lathe bed 1 support, make damping support leg 3 keep away from ground, make stand lathe bed 1 can be convenient remove through universal wheel 6, when need not to remove, can support through damping support leg 3, can play good shock attenuation effect.

Example 2

Referring to fig. 1-6, the difference between this embodiment and embodiment 1 is that four positioning insertion rods 10 are fixedly connected to the bottom end of the column bed 1, four positioning sleeves 9 are fixedly connected to positions of the top end of the supporting seat 2 corresponding to the positioning insertion rods 10, the four positioning insertion rods 10 respectively extend into the four positioning sleeves 9, a first fixed vertical plate 23 is correspondingly disposed beside each positioning insertion rod 10, an "L" -shaped positioning member 26 is slidably mounted between the first fixed vertical plate 23 and the positioning insertion rods 10 at the top end of the supporting seat 2, a sliding groove 28 is formed at the top end of the supporting seat 2, a guide block 27 is slidably mounted in the sliding groove 28, the top end of the guide block 27 is fixedly connected to the bottom end of the positioning member 26, a positioning groove 29 matched with the positioning member 26 is formed in the positioning insertion rod 10, the positioning member 26 passes through the outer wall of the positioning sleeve 9 and extends into the positioning groove 29, a one-way threaded rod 31 is rotatably mounted on one side of the first fixed vertical plate 23 close to the positioning member 26, one side fixedly connected with thread bush 30 that setting element 26 is close to first fixed riser 23, one-way threaded rod 31 and the thread bush 30 screw-thread fit, can promote the 30 horizontal migration of thread bush when one-way threaded rod 31 rotates, and then can promote setting element 26 horizontal migration, setting element 26 can insert and fix a position inserted bar 10 locking in constant head tank 29, make the top of fixing at supporting seat 2 that stand lathe bed 1 can be stable, and easy dismounting, it is fixed relatively in traditional bolt and nut, can be more convenient overhaul and maintain.

Rotate for more convenient manual drive one-way threaded rod 31, the one end fixedly connected with driven bevel gear 32 that first fixed riser 23 is close to in the outside of one-way threaded rod 31, one side that first fixed riser 23 is close to one-way threaded rod 31 is close to the top position and rotates and install vertical pivot 33, the bottom fixedly connected with drive bevel gear 34 of vertical pivot 33, drive bevel gear 34 meshes with driven bevel gear 32, the top fixedly connected with of vertical pivot 33 rotates handle 35, rotate the outside of handle 35 and install the rubber sleeve 36 that increases the comfort level of gripping, can drive bevel gear 34 through rotating handle 35 and rotate, rethread drive bevel gear 34 and driven bevel gear 32 mesh drive one-way threaded rod 31 and rotate, and is laborsaving and convenient.

Example 3

Referring to fig. 1-6, the difference between this embodiment and embodiment 1 lies in that four damping legs 3 are provided, four damping legs 3 are distributed at four corners of the bottom end of the supporting seat 2, a guide hole 13 is provided at a position corresponding to the damping leg 3 on the supporting seat 2, the top end of the damping leg 3 extends to the top of the supporting seat 2 through the guide hole 13 and is fixedly connected with a first limiting part 14, the outside of the damping leg 3 is located below the second limiting part 15 of the supporting seat 2, the outside of the damping leg 3 is sleeved with a first damping spring 16, the top end of the first damping spring 16 is abutted to the supporting seat 2, the bottom end of the first damping spring 16 is abutted to the second limiting part 15, vibration generated by the processing machine during operation on the column bed 1 can be buffered and absorbed by the first damping spring 16, and a good damping effect is achieved.

In order to further improve the damping effect, a second fixed vertical plate 21 is fixedly connected to the side of the supporting seat 2, a sliding block 18 is slidably mounted on the supporting seat 2 through a sliding rail 17, a connecting rod 19 is hinged between the bottom end of the sliding block 18 and the damping leg 3, a first guide rod 20 is fixedly connected to one side of the sliding block 18 close to the second fixed vertical plate 21, one end of the first guide rod 20 far away from the sliding block 18 movably penetrates through the second fixed vertical plate 21, a second damping spring 22 is sleeved outside the first guide rod 20, one end of the second damping spring 22 is abutted against the sliding block 18, the other end of the second damping spring 22 is abutted against the second fixed vertical plate 21, when the damping leg 3 slides up and down in the guide hole 13, the connecting rod 19 can rotate and push the sliding block 18 to move horizontally, and further push the first guide rod 20 to move horizontally and compress the second damping spring 22, the damping effect is further improved, and the capability of absorbing vibration is realized, reduce the vibration that stand lathe bed 1 received, weaken the noise, extension stand lathe bed 1 life.

Example 4

Referring to fig. 1-6, the present embodiment is different from embodiment 1 in that a bidirectional threaded rod 37 is rotatably installed between two side inner walls of a supporting box 4, two moving blocks 38 are threadedly installed on the outer side of the bidirectional threaded rod 37, a guide rail 39 is fixedly connected to the top inner wall of the supporting box 4, the moving blocks 38 are slidably installed on the guide rail 39, the moving blocks 38 are slidably connected to the top inner wall of the supporting box 4, a driven circular gear 40 is fixedly connected to the middle position of the outer side of the bidirectional threaded rod 37, a rotating motor 41 is fixedly installed on the bottom inner wall of the supporting box 4, an output shaft of the rotating motor 41 is fixedly connected to a driving circular gear 42, the driving circular gear 42 is engaged with the driven circular gear 40, the bottom end of the moving block 38 is hinged to a supporting rod 24, the bottom end of the supporting rod 24 extends to the outside of the supporting box 4 through an opening 25 formed in the bottom end of the supporting box 4 and is hinged to the top end of the supporting plate 5, can drive initiative circular gear 42 through rotating electrical machines 41 and rotate, rethread initiative circular gear 42 can drive two-way threaded rod 37 with the meshing of driven circular gear 40 and rotate, and then can drive two movable blocks 38 and be close to each other or keep away from the removal each other, depending on the direction of rotation of two-way threaded rod 37, can promote the direction removal that the backup pad 5 orientation was kept away from supporting box 4 downwards through bracing piece 24 when two movable blocks 38 were close to each other, thereby make universal wheel 6 and ground contact, and support stand lathe bed 1, make shock attenuation landing leg 3 keep away from ground, make stand lathe bed 1 can be convenient remove through universal wheel 6.

The working principle is as follows: supporting box 4 can drive 5 orientation of backup pad and remove towards the direction of keeping away from supporting box 4 to make universal wheel 6 and ground contact, and get up stand lathe bed 1 support, make damping support leg 3 keep away from ground, make stand lathe bed 1 can be convenient remove through universal wheel 6, when need not to remove, can support through damping support leg 3, can play good shock attenuation effect.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a digit control machine tool stand structure convenient to clearance, including stand lathe bed (1), a serial communication port, stand lathe bed (1) is closed structure, the both sides inside weld of stand lathe bed (1) has side gusset structure (11), the bottom inside weld of stand lathe bed (1) has bottom gluten plate structure (12), the below of stand lathe bed (1) is equipped with supporting seat (2), shock attenuation landing leg (3) are installed to the bottom of supporting seat (2), stand lathe bed (1) can be dismantled with supporting seat (2) and be connected, the bottom fixedly connected with supporting box (4) of supporting seat (2), the output of supporting box (4) is connected with backup pad (5), universal wheel (6) are all installed at four turnings in bottom of backup pad (5).

2. The numerical control machine tool column structure convenient to clean as claimed in claim 1, wherein four positioning insertion rods (10) are fixedly connected to the bottom end of the column bed (1), four positioning sleeves (9) are fixedly connected to the positions, corresponding to the positioning insertion rods (10), of the top end of the support seat (2), the four positioning insertion rods (10) respectively and correspondingly extend into the four positioning sleeves (9), a first fixed vertical plate (23) is correspondingly arranged beside each positioning insertion rod (10), an L-shaped positioning member (26) is slidably mounted between the first fixed vertical plate (23) and the positioning insertion rods (10) at the top end of the support seat (2), a positioning groove (29) matched with the positioning member (26) is formed in the positioning insertion rod (10), the positioning member (26) penetrates through the outer wall of the positioning sleeves (9) and extends into the positioning groove (29), and a one-way threaded rod (31) is rotatably mounted on one side, close to the positioning member (26), of the first fixed vertical plate (23) One side of the positioning piece (26) close to the first fixed vertical plate (23) is fixedly connected with a threaded sleeve (30), and the one-way threaded rod (31) is in threaded fit with the threaded sleeve (30).

3. The numerical control machine tool upright post structure convenient to clean as claimed in claim 2, wherein a sliding groove (28) is formed at the top end of the supporting seat (2), a guide block (27) is slidably mounted in the sliding groove (28), and the top end of the guide block (27) is fixedly connected with the bottom end of the positioning piece (26).

4. The numerical control machine tool stand column structure convenient to clean up of claim 3, characterized in that one end fixedly connected with driven bevel gear (32) that the outside of one-way threaded rod (31) is close to first fixed riser (23), one side that first fixed riser (23) is close to one-way threaded rod (31) is close to top position and rotates and installs vertical pivot (33), the bottom fixedly connected with drive bevel gear (34) of vertical pivot (33), drive bevel gear (34) and driven bevel gear (32) meshing, the top fixedly connected with of vertical pivot (33) rotates handle (35), rubber sleeve (36) is installed to the outside of rotating handle (35).

5. The numerical control machine tool column structure convenient to clean as claimed in claim 1, wherein the number of the shock absorption legs (3) is four, the four shock absorption legs (3) are distributed at four corners of the bottom end of the supporting seat (2), a guide hole (13) is formed in the supporting seat (2) at a position corresponding to the shock absorption legs (3), the top end of the shock absorption leg (3) extends to the upper side of the supporting seat (2) through the guide hole (13) and is fixedly connected with a first limiting part (14), the outer side of the shock absorption leg (3) is located below the supporting seat (2) and is fixedly connected with a second limiting part (15), a first shock absorption spring (16) is sleeved on the outer side of the shock absorption leg (3), the top end of the first shock absorption spring (16) is abutted against the supporting seat (2), and the bottom end of the first shock absorption spring (16) is abutted against the second limiting part (15).

6. The numerical control machine tool stand structure convenient to clearance of claim 5, characterized in that, the side fixedly connected with second fixed riser (21) of supporting seat (2), there is slider (18) through slide rail (17) slidable mounting of supporting seat (2), it has connecting rod (19) to articulate between the bottom of slider (18) and shock attenuation landing leg (3), slider (18) are close to the first guide bar (20) of one side fixedly connected with of second fixed riser (21), the one end activity that slider (18) were kept away from in first guide bar (20) runs through second fixed riser (21), the outside cover of first guide bar (20) is equipped with second damping spring (22), the one end and the slider (18) of second damping spring (22) are contradicted, the other end and the fixed riser (21) of second damping spring (22) are contradicted.

7. The numerical control machine tool upright post structure convenient for cleaning as claimed in claim 6, two-way threaded rod (37) are installed in the rotation between the both sides inner wall of support case (4), two movable blocks (38) are installed to the outside screw thread of two-way threaded rod (37), top inner wall sliding connection of movable block (38) and support case (4), the outside of two-way threaded rod (37) is located intermediate position fixedly connected with driven round gear (40), fixed mounting has rotating electrical machines (41) on the bottom inner wall of support case (4), the output shaft fixedly connected with initiative round gear (42) of rotating electrical machines (41), initiative round gear (42) and driven round gear (40) meshing, the bottom of movable block (38) articulates there is bracing piece (24), the bottom of bracing piece (24) is seted up opening (25) through support case (4) bottom and is extended to the outside of support case (4) and articulated with the top of backup pad (5).

8. The numerical control machine tool upright post structure convenient to clean as claimed in claim 1, wherein a guide rail (39) is fixedly connected to the inner wall of the top end of the supporting box (4), and the moving block (38) is slidably mounted on the guide rail (39).

9. The numerical control machine tool upright post structure convenient to clean as claimed in claim 1, wherein a second guide rod (7) is fixedly connected to each of four corners at the top end of the supporting plate (5), a guide sleeve (8) corresponding to the second guide rod (7) is fixedly connected to the outer side of the supporting box (4), and the top end of the second guide rod (7) extends into the guide sleeve (8).