CN209856029U - Quick-dismantling vacuum pump - Google Patents

Abstract

The utility model belongs to the technical field of pump valve equipment, especially, relate to a quick detach formula vacuum pump, which comprises a stator, rotor and elevating gear, the stator has been seted up the installation and has been led to the chamber, the rotor sets up and leads to the intracavity in the installation, elevating gear includes fixed subassembly, a supporting plate, lifting screw and two vertical guides, two vertical guides are all installed on the stator and are located the installation respectively and lead to the relative both sides in chamber, fixed subassembly slidable mounting is between two vertical guides, and fixed subassembly can dismantle and connect in the rotor, install in two vertical guides in the backup pad both ends, threaded hole is seted up to the backup pad, lifting screw wears to establish the screw hole and rotates to connect in fixed subassembly. When the rotor needs carry out the dismouting for the stator, rotatory lifting screw drives fixed subassembly and descends or rise to the position that corresponds the rotor, and the intracavity motion is led to in the installation to the rotor under lifting bolt's drive, and then realizes the steady removal of rotor in the narrow and small space in the stator, has effectively avoided rotor and stator to take place the phenomenon of colliding with and takes place.

Description

Quick-dismantling vacuum pump

Technical Field

The utility model belongs to the technical field of pump valve equipment, especially, relate to a quick detach formula vacuum pump.

Background

The vacuum pump is used as a device capable of improving, generating and maintaining vacuum in a certain closed space, and is widely applied to industries such as metallurgy, chemical engineering, food, electronic coating and the like. Whereas a vacuum pump is usually provided with a stator and a rotor arranged within the stator.

Among the prior art, be subject to the inherent structure of vacuum pump, the dismouting of rotor for the stator needs the manual work to accomplish in narrow and small space, at the dismouting in-process, often can appear the phenomenon of colliding with the rotor, and then easily causes the rotor to be damaged by the bruise, can cause the vacuum pump to scrap even.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a quick detach formula vacuum pump aims at solving the rotor and the stator of the artifical dismouting vacuum pump among the prior art, easily causes the rotor impaired, even vacuum pump condemned technical problem.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a quick detach formula vacuum pump, includes stator and rotor, the stator has been seted up the installation and has been led to the chamber, the rotor set up in the intracavity is led to in the installation, quick detach formula vacuum pump still includes elevating gear, elevating gear includes fixed subassembly, backup pad, lifting screw and two vertical guides, two vertical guides all install in on the stator and be located respectively the installation leads to the relative both sides of chamber opening part, fixed subassembly slidable mounting is in two between the vertical guides, just fixed subassembly can dismantle connect in the rotor, the relative both ends of backup pad are installed respectively in two same one end of vertical guides, the threaded hole is seted up to the backup pad, lifting screw wears to establish the screw hole and with fixed subassembly rotates to be connected.

Further, fixed subassembly includes the assembly piece, the lifting screw with the assembly piece rotates to be connected, the relative both sides of the width direction of assembly piece slidable mounting respectively in two on the vertical guide, the assembly piece has been seted up along its thickness direction and has been led to the chamber, the installation axle is installed to the one end of rotor, the installation axle inlays to be located in the assembly leads to the intracavity.

Further, the fixing assembly further comprises a fixing block and a fastening screw rod, the fixing block is mounted on one side, deviating from the mounting shaft, of the assembling block, an assembling hole is formed in the fixing block, an assembling screw hole is formed in one end, deviating from the rotor, of the mounting shaft, the assembling hole is right opposite to the assembling screw hole, and one end of the fastening screw rod penetrates through the assembling hole and is inserted into the assembling screw hole.

Further, the fixed block orientation one side in the chamber is led to in the assembly is seted up and is used for the holding chamber of installation axle, the holding chamber just to the pilot hole setting and with the pilot hole is linked together, fastening screw's one end stretches into the holding chamber and with installation axle spiro union.

Furthermore, the assembly block is towards one side of fixed block has seted up spacing breach, the fixed block is towards one side arch extension of assembly block forms spacing arch, spacing arch inlays to be located in the spacing breach.

Furthermore, a plurality of rotating wheels are installed on two opposite sides of the width direction of the assembling block, vertical guide grooves are formed in one sides, facing the assembling block, of the two vertical guide pieces, and the rotating wheels are arranged in the corresponding vertical guide grooves and can move along the guide paths of the corresponding vertical guide grooves.

Further, two vertical guide all includes mounting panel, connecting plate and limiting plate, the mounting panel install in on the stator, the connecting plate install in on the mounting panel, the limiting plate install in on the connecting plate, the mounting panel the connecting plate with the limiting plate encloses jointly to establish and is formed with vertical guide way.

Furthermore, the fixing assembly further comprises a plurality of fixing shafts, a plurality of through holes are formed in the assembling block in the width direction, the fixing shafts penetrate through the through holes respectively, and the rotating wheels are mounted at two ends of each fixing shaft.

Furthermore, bearing pieces are installed at two ends of each fixed shaft, and each rotating wheel is installed on each corresponding bearing piece.

Furthermore, the assembling block is provided with a plurality of pin holes along the thickness direction, each pin hole is communicated with the corresponding through hole, a pin is inserted into each pin hole, and one end of each pin is abutted to the fixed shaft in the corresponding through hole.

The utility model has the advantages that: the quick-release vacuum pump of the utility model comprises the lifting device, when the rotor needs to be disassembled and assembled relative to the stator, the lifting screw rod rotatably arranged on the supporting plate can be driven by the lifting screw rod to drive the fixing component which is slidably arranged between the two vertical guiding pieces to descend or ascend to the position corresponding to the rotor, and the fixing component is connected with the rotor, so that the rotor can move up and down in the narrow mounting through cavity under the driving of the lifting bolt along with the fixing component, thereby realizing the stable movement of the rotor in the narrow space in the stator, eliminating the potential danger in the process of manually holding the rotor in the stator to move, effectively avoiding the occurrence of the collision phenomenon between the rotor and the stator, make the rotor keep intact for stator dismouting in-process, so just so also make the security of vacuum pump in dismouting maintenance process effectively guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural view of a quick-release vacuum pump according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is an exploded schematic view of a quick-release vacuum pump according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an assembly block according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a vertical guide provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fixing block according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

10-stator 11-installation through cavity 20-rotor

21-mounting shaft 30-lifting device 31-fixing assembly

32-support plate 33-lifting screw 34-vertical guide

211-mounting screw hole 311-assembling block 312-assembling through cavity

313-fixing block 314-fastening screw 315-assembly hole

316-accommodating cavity 317-limiting notch 318-limiting protrusion

319-rotating wheel 320-fixed shaft 321-threaded hole

322-through hole 323-pin hole 324-connecting hole

331-matching nut 341-vertical guide groove 342-mounting plate

343-connecting plate 344-limiting plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-6 are exemplary and intended to be used to illustrate the invention, but should not be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed 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 limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1 to 3, a quick-release vacuum pump includes a stator 10 and a rotor 20, the stator 10 is provided with an installation through cavity 11, and the rotor 20 is disposed in the installation through cavity 11. The quick-release vacuum pump further comprises a lifting device 30, and the lifting device 30 comprises a fixing component 31, a supporting plate 32, a lifting screw 33 and two vertical guide pieces 34. In particular, the two vertical guides 34 are mounted on the stator 10 and are respectively located on opposite sides of the opening of the mounting through cavity 11 of the stator 10. Wherein, two vertical guides 34 are vertically arranged at two opposite sides of the opening of the installation through cavity 11. The fixed assembly 31 is slidably mounted between the two vertical guides 34. The fixing assembly 31 can move up and down along the two vertical guides 34 at the opening of the installation through cavity 11. The fixing member 31 is detachably connected to the rotor 20, so that the rotor 20 can move along with the fixing member 31 in the installation cavity 11 under the driving of the fixing member 31. Further, the opposite ends of the supporting plate 32 are respectively mounted at the same ends of the two vertical guiding members 34, the supporting plate 32 is provided with a threaded hole 321, and the lifting screw 33 penetrates through the threaded hole 321 and is rotatably connected to the fixing component 31. Thus, the supporting plate 32 provides mounting and supporting for the lifting screw 33, and the lifting screw 33 rotates by matching with the thread of the threaded hole 321 of the supporting plate 32, so as to drive the fixing component 31 connected in a rotating manner to ascend or descend along the axis of the lifting screw 33, and further the fixing component 31 can drive the rotor 20 to move up and down relative to the stator 10. Further, a knob handle may be mounted on the top of the lifting screw 33, such that an operator may manually rotate the knob handle to lift the screw.

Optionally, the lifting device 30 may further include a driving motor (not shown), and the lifting screw 33 may be sleeved with a driving nut (not shown), and a driving shaft of the driving motor may be in transmission connection with the driving nut through a transmission member to drive the driving nut to rotate, so as to drive the lifting screw 33 to lift. Therefore, the automatic lifting of the lifting device 30 is realized, and the labor intensity of operators is reduced.

The following further explains the quick-release vacuum pump provided by the embodiment of the present invention: the embodiment of the utility model provides a quick detach formula vacuum pump, because including elevating gear 30, so when rotor 20 needs to carry out the dismouting relative to stator 10, can install the rotatory lifting screw 33 on backup pad 32, and then make lifting screw 33 drive the fixed subassembly 31 of slidable mounting between two vertical guides 34 and descend or rise to the position that corresponds rotor 20, and make fixed subassembly 31 be connected with rotor 20, so rotor 20 can be with fixed subassembly 31 up-and-down motion in narrow and small ann's joining in marriage intracavity under the drive of lifting bolt, and then realize the steady removal of rotor 20 in the narrow and small space in stator 10, eliminated the artifical potential danger of embracing the removal in-process of holding rotor 20 in stator 10, effectively avoided rotor 20 and stator 10 to take place the phenomenon of colliding with and take place, make rotor 20 keep intact in the dismouting in-process relative to stator 10, therefore, the safety of the vacuum pump in the process of disassembly, assembly and maintenance is effectively ensured.

In another embodiment of the present invention, as shown in fig. 1, fig. 2 and fig. 4, the fixing assembly 31 includes an assembling block 311, the lifting screw 33 is rotatably connected to the assembling block 311, the two opposite sides of the width direction of the assembling block 311 are respectively slidably mounted on the two vertical guiding members 34, the assembling block 311 has been provided with an assembling through cavity 312 along the thickness direction thereof, the mounting shaft 21 is mounted on one end of the rotor 20, and the mounting shaft 21 is disposed in the assembling through cavity 312. Specifically, the lifting screw 33 is rotatably connected to a connecting hole 324 formed at the top or bottom of the assembling block 311 to drive the assembling block 311 to ascend or descend. And by making the opposite sides of the assembling block 311 slidably mounted on the corresponding vertical guides 34, the assembling block 311 can be stably raised or lowered under the guiding action of the two vertical guides 34. Alternatively, the mounting block 311 may be slidably mounted to the vertical guide 34 by way of a rail engaging a slider or pulley. Meanwhile, the mounting shaft 21 arranged at one end of the rotor 20 is embedded in the assembly through cavity 312, so that the rotor 20 can be detachably connected with the assembly block 311, and can be driven by the assembly block 311 to ascend or descend.

In another embodiment of the present invention, as shown in fig. 1 to 3, the fixing assembly 31 further includes a fixing block 313 and a fastening screw 314, the fixing block 313 is installed on one side of the assembling block 311 departing from the mounting shaft 21, the fixing block 313 has been provided with an assembly hole 315, the mounting shaft 21 deviates from one end of the rotor 20 and has been provided with a mounting screw hole 211, the assembly hole 315 is just set up for the mounting screw hole 211, and one end of the fastening screw 314 is passed through the assembly hole 315 and inserted into the mounting screw hole 211. Specifically, the fixing block 313 may be embedded in the mounting block 311, or may be mounted on the mounting block 311 by bolts. By additionally arranging the fixing block 313 and the fastening screw 314, the fastening screw 314 can be inserted into the mounting shaft 21 to ensure the stability of the connection between the mounting shaft 21 and the assembling block 311. Due to the existence of the fixing block 313, on one hand, effective support is provided for the fastening screw 314, on the other hand, the moment acting on the fastening screw 314 is balanced, so that the moment borne by the fastening screw 314 inserted into the mounting screw hole 211 and the two ends penetrating through the fixing block 313 is approximately equal, and the service life of the fastening screw 314 is ensured. Optionally, the fastening screw 314 and the lifting screw 33 are sleeved with a fitting nut 331 to cooperate with an external object such as a wrench to rotate and adjust the fastening screw 314 and the lifting screw 33.

In another embodiment of the present invention, as shown in fig. 6, the fixing block 313 is provided with a holding cavity 316 for holding the mounting shaft 21 toward one side of the assembling through cavity 312, the holding cavity 316 is communicated with the assembling hole 315, and one end of the fastening screw 314 extends into the holding cavity 316 and is screwed with the mounting shaft 21. Specifically, due to the existence of the accommodating cavity 316, one end of the mounting shaft 21 can penetrate through the assembling through cavity 312 and extend into the accommodating cavity 316, so that the connection between the mounting shaft 21 and the fixing block 313 is further realized, the mounting shaft 21 is simultaneously connected with the assembling block 311 and the fixing block 313 installed on the assembling block 311, and further the overall connection relationship of the mounting shaft 21 relative to the fixing component 31 is more stable, so that the stability of the up-and-down movement of the rotor 20 in the mounting through cavity 11 under the driving of the fixing component 31 is also ensured.

In another embodiment of the present invention, as shown in fig. 3 and 6, a limiting notch 317 is opened on one side of the mounting block 311 facing the fixing block 313, a limiting protrusion 318 is formed on the fixing block 313 facing the protruding extension on one side of the mounting block 311, and the limiting protrusion 318 is embedded in the limiting notch 317. Specifically, the fitting notch 317 and the limiting protrusion 318 are fitted, so that a simple and reliable connection relationship between the mounting block 311 and the fixing block 313 is realized.

Further, as shown in fig. 3 and 6, a limit notch 317 is opened at an opening edge of the assembly through cavity 312 facing the fixing block 313, and has an annular notch shape. The limiting protrusion 318 is annular and formed at the opening of the accommodating cavity 316, and the inner wall of the limiting protrusion 318 is smoothly connected with the inner wall of the accommodating cavity 316. Through the arrangement, on one hand, the limiting notch 317 and the limiting protrusion 318 can fully utilize the space of the accommodating cavity 316 and the assembling through cavity 312, and the assembling space of the assembling block 311 and the fixing block 313 is saved. On the other hand, the coaxiality of the central axes of the assembling through cavity 312 and the accommodating cavity 316 is ensured, so that the mounting shaft 21 and the fastening screw 314 can be more smoothly connected in the accommodating cavity 316.

In another embodiment of the present invention, as shown in fig. 3, a plurality of rotating wheels 319 are installed on two opposite sides of the width direction of the assembling block 311, a vertical guiding groove 341 is formed on one side of each of the two vertical guiding members 34 facing the assembling block 311, and each rotating wheel 319 is disposed in the corresponding vertical guiding groove 341 and can move along the guiding path of the corresponding vertical guiding groove 341. Specifically, the rotating wheels 319 are arranged on the two sides of the assembling block 311, and the rotating wheels 319 are matched with the vertical guide grooves 341, so that in the process that the assembling block 311 slides relative to the vertical guide grooves 341, the rotating wheels 319 can roll and move in the guide grooves along the guide paths, the sliding friction force of the assembling block 311 relative to the vertical guide piece 34 is obviously reduced, and the smoothness of the up-and-down lifting motion of the assembling block 311 is improved.

In another embodiment of the present invention, as shown in fig. 1, fig. 3 and fig. 5, the two vertical guiding members 34 all include a mounting plate 342, a connecting plate 343 and a limiting plate 344, the mounting plate 342 is mounted on the stator 10, the connecting plate 343 is connected to the mounting plate 342, the limiting plate 34 is connected to the connecting plate 343, and the mounting plate 342, the connecting plate 343 and the limiting plate 344 enclose together to form the vertical guiding groove 341. The mounting plate 342 is parallel to the limiting plate 344, the connecting plate 343 is perpendicular to the mounting plate 342 and the limiting plate 344, and the supporting plate 32 can be fixed to the connecting plates 343 of the two vertical guides 34 on the two sides by screws. Specifically, the mounting plate 342, the connecting plate 343, and the limit plate 344 are welded to each other, so that the overall manufacturing cost of the vertical guide 34 can be reduced. Alternatively, the mounting plate 342, the connecting plate 343 and the limiting plate 344 may be integrally formed by sand casting or die casting. Therefore, the overall manufacturing cost of the vertical guide piece 34 can be further reduced, meanwhile, in the vibration environment when the vacuum pump works, the integrity of the vertical guide piece 34 can be ensured, and cracks are prevented from appearing at the connecting part among the mounting plate 342, the connecting plate 343 and the limiting plate 344 in the vibration process.

In another embodiment of the present invention, as shown in fig. 3, the fixing assembly 31 further includes a plurality of fixing shafts 320, the assembling block 311 has a plurality of through holes 322 along the width direction thereof, each fixing shaft 320 is respectively inserted into each through hole 322, and the rotating wheels 319 are installed at both ends of each fixing shaft 320. Specifically, by providing the fixing shaft 320 and installing the rotating wheels 319 on both ends of the fixing shaft 320, the fixing of the rotating wheels 319 is achieved two by the fixing shaft 320, and the phenomenon of manufacturing cost increase caused by independently providing the rotating connecting members on opposite sides of the assembling block 311 is avoided.

Alternatively, as shown in fig. 3, the fixing shaft 320 may be fixedly coupled with the rotating wheel 319 while being fixed in the passing hole 322 by a plurality of bearings, so that the fixing shaft 320 is rotatably fitted with respect to the passing hole 322. Thus, the rotating speeds of the two rotating wheels 319 installed on the fixed shaft 320 are ensured to be consistent, so that the balance of the two sides of the assembling block 311 in the width direction when the assembling block 311 ascends or descends along the vertical guide 34 is facilitated, and the ascending or descending smoothness of the assembling block 311 is further improved.

In another embodiment of the present invention, bearing members (not shown) are installed at both ends of each fixed shaft 320, and each rotating wheel 319 is installed on the corresponding bearing member. Specifically, by providing bearing members at both ends of the fixed shaft 320, the rotatable assembly of the rotating wheel 319 with respect to the fixed shaft 320 is achieved, and the presence of the bearing members also makes the rotating wheel 319 rotate more efficiently.

In another embodiment of the present invention, as shown in fig. 4, the assembling block 311 has a plurality of pin holes 323 formed along the thickness direction thereof, each pin hole 323 is communicated with the corresponding through hole 322, a pin (not shown) is inserted into each pin hole 323, and one end of each pin abuts against the fixing shaft 320 in the corresponding through hole 322. Specifically, the assembling block 311 is provided with a pin hole 323 corresponding to the through hole 322, so that the pin can be inserted into the pin hole 323 and abut against the fixing shaft 320, and thus the fixing shaft 320 can be stably installed in the assembling block 311. When the fixed shaft 320 needs to be pulled out, the rotating wheel 319 at one end of the fixed shaft 320 can be detached, and the pin can be pulled out from the fixed shaft 320, so that the fixed shaft 320 can be easily pulled out from the assembly block 311.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a quick detach formula vacuum pump, includes stator and rotor, the stator has been seted up the installation and has been led to the chamber, the rotor set up in the intracavity is led to in the installation, its characterized in that: the quick detach formula vacuum pump still includes elevating gear, elevating gear includes fixed subassembly, backup pad, lifting screw and two vertical guides, two vertical guides all install in on the stator and be located respectively the relative both sides of installation logical chamber opening part, fixed subassembly slidable mounting in two between the vertical guides, just fixed subassembly can dismantle connect in the rotor, install respectively in two the relative both ends of backup pad the same one end of vertical guides, the backup pad is seted up threaded hole, lifting screw wears to establish the screw hole and with fixed subassembly rotates and connects.

2. The quick release vacuum pump of claim 1, wherein: the fixed subassembly includes the assembly piece, the lifting screw with the assembly piece rotates to be connected, the relative both sides of the width direction of assembly piece slidable mounting respectively in two on the vertical guide, the assembly piece has been seted up along its thickness direction and has been led to the chamber, the installation axle is installed to the one end of rotor, the installation axle inlays to be located the intracavity is led to in the assembly.

3. The quick release vacuum pump of claim 2, wherein: the fixing assembly further comprises a fixing block and a fastening screw rod, the fixing block is installed on one side, deviating from the installation shaft, of the assembly block, an assembly hole is formed in the fixing block, the installation shaft deviates from one end of the rotor, an installation screw hole is formed in the end, just opposite to the installation screw hole, of the assembly hole, and one end of the fastening screw rod penetrates through the assembly hole and is inserted into the installation screw hole.

4. The quick release vacuum pump of claim 3, wherein: the fixed block orientation one side that the chamber was led to in the assembly is offered and is used for the holding chamber of installation axle, the holding chamber just right the pilot hole setting and with the pilot hole is linked together, fastening screw's one end stretches into the holding chamber and with the installation axle spiro union.

5. The quick release vacuum pump of claim 3, wherein: the assembly block orientation spacing breach has been seted up to one side of fixed block, the fixed block orientation the protruding extension in one side of assembly block forms spacing arch, spacing arch inlays to be located in the spacing breach.

6. A quick release vacuum pump according to any of claims 2 to 5, characterized in that: the relative both sides of the width direction of assembly piece all install a plurality of rotation wheels, two vertical guide all is formed with vertical guide way towards one side of assembly piece, each rotation wheel all sets up in corresponding vertical guide way and all can follow the direction route removal of corresponding vertical guide way.

7. The quick release vacuum pump of claim 6, wherein: two vertical guide all includes mounting panel, connecting plate and limiting plate, the mounting panel install in on the stator, the connecting plate install in on the mounting panel, the limiting plate install in on the connecting plate, the mounting panel the connecting plate with the limiting plate encloses jointly to establish and is formed with vertical guide way.

8. The quick release vacuum pump of claim 6, wherein: the fixing assembly further comprises a plurality of fixing shafts, a plurality of through holes are formed in the assembling block in the width direction, the fixing shafts penetrate through the through holes respectively, and the rotating wheels are mounted at two ends of each fixing shaft.

9. The quick release vacuum pump of claim 8, wherein: bearing parts are installed at two ends of each fixed shaft, and each rotating wheel is installed on each corresponding bearing part.

10. The quick release vacuum pump of claim 8, wherein: the assembling block is provided with a plurality of pin holes along the thickness direction, each pin hole is communicated with the corresponding through hole, pins are inserted into the pin holes, and one end of each pin is abutted to the fixed shaft in the corresponding through hole.