CN110745712B - A lifting device for electric hoist - Google Patents

Abstract

The invention relates to the technical field of electric hoists, and discloses a lifting device for electric hoists, comprising an electric hoist main body, a wall support column and a support rod assembly, wherein the support rod assembly includes a telescopic support rod and a main support rod, and the telescopic support An adjustable fixing mechanism is arranged between the rod and the main support rod, the main body of the electric hoist is fixed on the top surface of the telescopic support rod, the surface of the wall support column is sleeved with a support sleeve, and one side of the support sleeve is provided with an integrated type side block; through the set rectangular inner chute, base block groove, inner base block, tension spring chamber, pull plate, connecting block, limit clamp, adjustment clamp hole, rotatable pull rod, horizontal pull block, limit The side block and the side chute allow the height of the support sleeve to be quickly adjusted up and down on the surface of the wall support column, so that the height of the main body of the electric hoist can be flexibly adjusted up and down according to the actual situation, and the overall adjustment method is compared The original device is more convenient, which can save the operator's adjustment time and improve work efficiency.

Description

A lifting device for electric hoist

technical field

The invention belongs to the technical field of electric hoists, and particularly relates to a lifting device for electric hoists.

Background technique

The full name of electric hoist is electric hoist. It is a small lifting equipment with small size, light weight and simple operation. It is widely used in industrial and mining enterprises, storage and other places. It is mainly composed of electric motor, transmission mechanism and drum or sprocket.

When the existing electric hoist is in use, it needs to be installed on a wall bracket. This wall bracket consists of a wall support column and a support rod. The electric hoist is fixed on the surface of the support rod by bolts, and due to the height of the support rod The lifting adjustment cannot be performed quickly, so that the electric hoist is also inconvenient to perform the lifting adjustment in the subsequent use process, and there are certain disadvantages. Therefore, the present invention provides a lifting device for the electric hoist.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a lifting device for an electric hoist, so as to solve the problem that the existing electric hoist proposed in the above-mentioned background art needs to be installed on a wall bracket for use. The electric hoist is fixed on the surface of the strut by bolts, and because the height of the strut cannot be adjusted quickly and easily, the electric hoist is inconvenient to lift and adjust in the subsequent use process, and there are certain drawbacks question.

In order to achieve the above purpose, the present invention provides the following technical solutions: a lifting device for an electric hoist, comprising an electric hoist main body, a wall strut and a strut assembly, and the strut assembly includes a telescopic strut and a main strut, and An adjustable fixing mechanism is arranged between the telescopic support rod and the main support rod, the main body of the electric hoist is fixed on the top surface of the telescopic support rod, the surface of the wall support column is sleeved with a support sleeve, and one side of the support sleeve is provided with a support sleeve. There is an integrated side block, the bottom end of the main strut is rotatably connected with the side block, the interior of the wall strut is provided with a rectangular inner chute, the interior of the support sleeve is provided with a base block groove, and the base block An inner base block is arranged inside the groove, two tension spring chambers are symmetrically opened inside the support sleeve, and the two tension spring chambers are respectively located on both sides of the base block groove, and the interior of the tension spring chambers are connected with Pulling plate, two sides of the inner base block are symmetrically provided with connecting blocks, and the top of the connecting block is welded and fixed to the pulling plate, and two sides of the base block groove are symmetrically provided with strip-shaped slideways corresponding to the connecting blocks , the top of the inner base block is provided with an integrated limit clamp rod, the front surface of the wall support column is evenly provided with a plurality of adjustment clamp holes adapted to the limit clamp rod, and the limit clamp rod is The top end penetrates into the interior of the rectangular inner chute, the front surface of the support sleeve is provided with a transverse pull block, and the inner side of the transverse pull block is fixed with a rotatable pull rod, and the top end of the rotatable pull rod is located in the base block groove inside, and the top end of the rotatable pull rod is rotatably connected with the inner base block.

Preferably, the adjustable fixing mechanism includes a rod slot opened inside the main strut, the bottom end of the telescopic strut is provided with an integrated inner end block, and the inner end block is located inside the rod slot, and the inner end block is located inside the rod slot. A circular through hole is formed through the inside of the end block, and a plurality of adjusting bolt holes corresponding to the circular through holes are uniformly opened on both sides of the main strut, and the adjusting bolt holes communicate with the inside of the rod slot.

Preferably, the top end of the rotatable pull rod is provided with an integrated rotating block, and the inner base block is provided with a rotating groove adapted to the rotating block, and the rotating block is located inside the rotating groove.

Preferably, the front surface of the support sleeve is provided with a pulling hole adapted to the rotatable pull rod, the top surface of the rotatable pull rod is symmetrically provided with two limit side blocks, and the two sides of the pull hole are symmetrically opened with Two side chutes corresponding to the limit side blocks.

Preferably, two side surfaces of the horizontal pull block are symmetrically provided with integral positioning blocks, and the front surface of the support sleeve is provided with two strip-shaped positioning grooves parallel to the positioning blocks.

Preferably, the inner top of the rectangular inner chute is provided with a rectangular inner slider, one side of the rectangular inner slider is provided with a bump, and the top of the bump is located on the outer side of the wall brace, the wall brace The side of the main support is provided with a bump slide corresponding to the wall support column, and the bump slide is communicated with the interior of the rectangular inner chute. The top end of the bump is connected in rotation.

Preferably, both ends of the wall support column are provided with L-shaped fixing plates, and the interior of the L-shaped fixing plates is provided with four reserved bolt holes.

Compared with the prior art, the beneficial effects of the present invention are:

1. Through the set rectangular inner chute, base block groove, inner base block, tension spring chamber, pull plate, connecting block, limit clamp, adjustment clamp hole, rotatable pull rod, horizontal pull block, limit side block And the side chute, so that the height of the support sleeve can be quickly adjusted up and down on the surface of the wall support column, so that the height of the main body of the electric hoist can be adjusted flexibly according to the actual situation, and the overall adjustment method is more than the original device. It is convenient for operators to save adjustment time and improve work efficiency.

2. By setting the inner end block, rod slot, adjusting bolt hole and circular through hole, the length of the strut assembly can be adjusted appropriately according to the specific use situation, thereby changing the position of the main body of the electric hoist in the horizontal direction and improving the The convenience of use of the electric hoist main body avoids the problem of inconvenience to the subsequent use of the electric hoist main body due to the short length of the strut assembly.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a top-view cross-sectional structural schematic diagram of the connection between the support sleeve and the wall support column of the present invention;

Fig. 3 is the partial enlarged structural schematic diagram of A area in Fig. 2 of the present invention;

FIG. 4 is a schematic cross-sectional structural diagram of the connection between the bump and the wall support column of the present invention;

5 is a schematic cross-sectional structural diagram of the connection between the telescopic strut and the main strut according to Embodiment 2 of the present invention;

In the picture: 1. Main body of electric hoist; 2. Telescopic strut; 3. Tilt rod; 4. Bump; 5. Wall strut; 6. Support sleeve; 7. Horizontal pull block; 8. Adjustment hole; 9 , L-shaped fixing plate; 10, side block; 11, adjusting bolt hole; 12, main strut; 13, rectangular inner chute; 14, limit clamp; 15, pull plate; 16, tension spring chamber; 17, Rotatable pull rod; 18, base block slot; 19, inner base block; 20, bump slideway; 21, connecting block; 22, side chute; 23, limit side block; 24, rectangular inner slide block; 25, Rod slot; 26, inner end block; 27, circular through hole.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

1 to 4, the present invention provides a technical solution: a lifting device for an electric hoist, comprising an electric hoist main body 1, a wall strut 5 and a strut assembly, and the strut assembly includes a telescopic strut 2 and The main strut 12, and an adjustable fixing mechanism is arranged between the telescopic strut 2 and the main strut 12, the electric hoist main body 1 is fixed on the top surface of the telescopic strut 2 by bolts, and the surface of the wall strut 5 is sleeved with a brace Sleeve 6, and one side of the support sleeve 6 is provided with an integrated side block 10, the bottom end of the main support rod 12 is connected with the side block 10 through the rotating shaft, and the interior of the wall support column 5 is provided with a rectangular inner chute 13. The inside of the sleeve 6 is provided with a base block groove 18, and the inside of the base block groove 18 is provided with an inner base block 19. The inside of the support sleeve 6 is symmetrically provided with two tension spring chambers 16, and the two tension spring chambers 16 are respectively located at the base. On both sides of the block groove 18, the interior of the tension spring chamber 16 is connected with the tension plate 15 through the tension spring, and the two sides of the inner base block 19 are symmetrically provided with connection blocks 21 by welding, and the top of the connection block 21 is welded with the tension plate 15. Fixed, the two sides of the base block groove 18 are symmetrically provided with strip-shaped slideways corresponding to the connecting block 21, the top end of the inner base block 19 is provided with an integrated limit clamp 14, and the front surface of the wall support column 5 is evenly opened. There are a plurality of adjustment card holes 8 which are matched with the limit clamp rod 14, and the top end of the limit clamp rod 14 penetrates into the interior of the rectangular inner chute 13, the front surface of the support sleeve 6 is provided with a horizontal pull block 7, And the inner side of the horizontal pull block 7 is welded and fixed with a rotatable pull rod 17, the top end of the rotatable pull rod 17 is located inside the base block groove 18, and the top end of the rotatable pull rod 17 is rotatably connected with the inner base block 19, so that the support sleeve 6 is rotatably connected. The height can be adjusted up and down quickly on the surface of the wall support column 5, so that the height of the electric hoist main body 1 can be adjusted up and down flexibly according to the actual situation.

In this embodiment, preferably, the top end of the rotatable pull rod 17 is provided with an integrated rotating block, and the inner base block 19 is provided with a rotating groove adapted to the rotating block, and the rotating block is located inside the rotating groove, so that it can be The rotary pull rod 17 can be rotated smoothly.

In this embodiment, preferably, the front surface of the support sleeve 6 is provided with a pulling hole adapted to the rotatable pull rod 17, and the top surface of the rotatable pull rod 17 is symmetrically provided with two limit side blocks 23 by welding, and the pull Two side sliding slots 22 corresponding to the limit side blocks 23 are symmetrically opened on both sides of the hole, so that after the rotatable pull rod 17 pulls the limit clamp rod 14 from the inside of the wall support column 5, it can be limited by rotation. position, so that the support sleeve 6 can be easily slid up and down.

In this embodiment, preferably, the two side surfaces of the horizontal pull block 7 are symmetrically provided with integral positioning blocks, and the front surface of the support sleeve 6 is provided with two strip-shaped positioning grooves parallel to the positioning blocks, so that the operation Personnel can align the limiting side blocks 23 with the side sliding grooves 22 by aligning the two positioning blocks with the bar-shaped positioning grooves, thereby making it easier to pull the rotatable pull rod 17 .

In this embodiment, preferably, the inner top of the rectangular inner chute 13 is provided with a rectangular inner sliding block 24 , and one side of the rectangular inner sliding block 24 is provided with a bump 4 , and the top of the bump 4 is located at the top of the wall support column 5 . On the outside, the side of the wall support column 5 is provided with a bump slideway 20 corresponding to the wall support column 5, and the bump slideway 20 is communicated with the inside of the rectangular inner chute 13, and the top of the main support rod 12 is connected with a rotating shaft through rotation. The oblique pull rod 3, and the top end of the oblique pull rod 3 is connected with the top end of the bump 4 through the rotating shaft, so that the main strut 12 can be well supported under the action of the oblique pull rod 3, and does not affect the normal up and down adjustment of the support sleeve 6.

In this embodiment, preferably, both ends of the wall support column 5 are provided with L-shaped fixing plates 9 by welding, and the interior of the L-shaped fixing plate 9 is provided with four reserved bolt holes, so that the L-shaped fixing plate 9 is provided with four reserved bolt holes. Can be bolted to the outer wall surface.

Example 2

1 to 5, the present invention provides a technical solution: a lifting device for an electric hoist, comprising an electric hoist main body 1, a wall strut 5 and a strut assembly, and the strut assembly includes a telescopic strut 2 and The main strut 12, and an adjustable fixing mechanism is arranged between the telescopic strut 2 and the main strut 12, the electric hoist main body 1 is fixed on the top surface of the telescopic strut 2 by bolts, and the surface of the wall strut 5 is sleeved with a brace Sleeve 6, and one side of the support sleeve 6 is provided with an integrated side block 10, the bottom end of the main support rod 12 is connected with the side block 10 through the rotating shaft, and the interior of the wall support column 5 is provided with a rectangular inner chute 13. The inside of the sleeve 6 is provided with a base block groove 18, and the inside of the base block groove 18 is provided with an inner base block 19. The inside of the support sleeve 6 is symmetrically provided with two tension spring chambers 16, and the two tension spring chambers 16 are respectively located at the base. On both sides of the block groove 18, the interior of the tension spring chamber 16 is connected with the tension plate 15 through the tension spring, and the two sides of the inner base block 19 are symmetrically provided with connection blocks 21 by welding, and the top of the connection block 21 is welded with the tension plate 15. Fixed, the two sides of the base block groove 18 are symmetrically provided with strip-shaped slideways corresponding to the connecting block 21, the top end of the inner base block 19 is provided with an integrated limit clamp 14, and the front surface of the wall support column 5 is evenly opened. There are a plurality of adjustment card holes 8 which are matched with the limit clamp rod 14, and the top end of the limit clamp rod 14 penetrates into the interior of the rectangular inner chute 13, the front surface of the support sleeve 6 is provided with a horizontal pull block 7, And the inner side of the horizontal pull block 7 is welded and fixed with a rotatable pull rod 17, the top end of the rotatable pull rod 17 is located inside the base block groove 18, and the top end of the rotatable pull rod 17 is rotatably connected with the inner base block 19, so that the support sleeve 6 is rotatably connected. The height can be adjusted up and down quickly on the surface of the wall support column 5, so that the height of the electric hoist main body 1 can be adjusted up and down flexibly according to the actual situation.

In this embodiment, preferably, the adjustable fixing mechanism includes a rod slot 25 opened inside the main strut 12, the bottom end of the telescopic strut 2 is provided with an integral inner end block 26, and the inner end block 26 is located in the rod slot 25, the inner end block 26 is provided with a circular through hole 27, and the two side surfaces of the main strut 12 are evenly provided with a plurality of adjustment bolt holes 11 corresponding to the circular through holes 27. The adjustment bolt holes 11 communicates with the rod groove 25 inside, so that the length of the strut assembly can be properly adjusted according to the specific use situation, thereby changing the position of the electric hoist main body 1 in the horizontal direction.

In this embodiment, preferably, the top end of the rotatable pull rod 17 is provided with an integrated rotating block, and the inner base block 19 is provided with a rotating groove adapted to the rotating block, and the rotating block is located inside the rotating groove, so that it can be The rotary pull rod 17 can be rotated smoothly.

In this embodiment, preferably, the front surface of the support sleeve 6 is provided with a pulling hole adapted to the rotatable pull rod 17, and the top surface of the rotatable pull rod 17 is symmetrically provided with two limit side blocks 23 by welding, and the pull Two side sliding slots 22 corresponding to the limit side blocks 23 are symmetrically opened on both sides of the hole, so that after the rotatable pull rod 17 pulls the limit clamp rod 14 from the inside of the wall support column 5, it can be limited by rotation. position, so that the support sleeve 6 can be easily slid up and down.

In this embodiment, preferably, the two side surfaces of the horizontal pull block 7 are symmetrically provided with integral positioning blocks, and the front surface of the support sleeve 6 is provided with two strip-shaped positioning grooves parallel to the positioning blocks, so that the operation Personnel can align the limiting side blocks 23 with the side sliding grooves 22 by aligning the two positioning blocks with the bar-shaped positioning grooves, thereby making it easier to pull the rotatable pull rod 17 .

In this embodiment, preferably, the inner top of the rectangular inner chute 13 is provided with a rectangular inner sliding block 24 , and one side of the rectangular inner sliding block 24 is provided with a bump 4 , and the top of the bump 4 is located at the top of the wall support column 5 . On the outside, the side of the wall support column 5 is provided with a bump slideway 20 corresponding to the wall support column 5, and the bump slideway 20 is communicated with the inside of the rectangular inner chute 13, and the top of the main support rod 12 is connected with a rotating shaft through rotation. The oblique pull rod 3, and the top end of the oblique pull rod 3 is connected with the top end of the bump 4 through the rotating shaft, so that the main strut 12 can be well supported under the action of the oblique pull rod 3, and does not affect the normal up and down adjustment of the support sleeve 6.

In this embodiment, preferably, both ends of the wall support column 5 are provided with L-shaped fixing plates 9 by welding, and the interior of the L-shaped fixing plate 9 is provided with four reserved bolt holes, so that the L-shaped fixing plate 9 is provided with four reserved bolt holes. Can be bolted to the outer wall surface.

The model of the main body 1 of the electric hoist in the present invention is PA1000;

The working principle and use process of the present invention: when the electric hoist is in use, the two L-shaped fixing plates 9 at the end of the wall support column 5 are firstly fixed on the outer wall by bolts, and then the main body 1 of the electric hoist is fixed on the outer wall by bolts. The end of the telescopic support rod 2 can be installed to complete the installation of the telescopic support rod 2, and the main body 1 of the electric hoist can be used normally;

When the height of the main body 1 of the electric hoist needs to be adjusted up and down, it is only necessary to pull the horizontal pull block 7 forcefully, so that the inner base block 19 can be pulled to the other end of the base block groove 18, and the pull plate 15 can be pulled towards the other end of the base block groove 18. The tension spring inside the spring chamber 16 is stretched, so that the top end of the limiting clamp 14 can be pulled out from the inside of the rectangular inner chute 13, without limiting the position of the support sleeve 6, and at this time the surface of the rotatable pull rod 17 can be pulled out. The limit side block 23 will be pulled out of the support sleeve 6 through the side chute 22, and then the lateral pull block 7 will be rotated, so that the rotatable pull rod 17 can be rotated on the surface of the inner base block 19, and the limit side block 23 is no longer aligned with the side chute 22, and then release the horizontal pull block 7, so that the rotatable pull rod 17 is blocked by the limit side block 23 and cannot be pulled back, so that the limit lever 14 will not be able to be pulled back. Once inserted into the rectangular inner chute 13, the support sleeve 6 can be directly slid up and down on the surface of the wall support column 5, and the height of the main support rod 12, the telescopic support rod 2 and the electric hoist main body 1 can be raised and lowered. Adjustment, when adjusted to a suitable height, rotate the horizontal pull block 7 so that the limit side block 23 is aligned with the side chute 22, and then release the horizontal pull block 7, so that the tension spring inside the tension spring chamber 16 will The pull plate 15 is pulled back, and the rotatable pull rod 17 is pulled back through the inner base block 19, and the limiting side block 23 is pulled into the interior of the base block groove 18. The top of the limit clamping rod 14 can be aligned with the nearest adjustment clamping hole 8, and smoothly through the adjustment clamping hole 8 into the inside of the rectangular inner chute 13, the support sleeve 6 can be limited again, thereby making the electric hoist After the height adjustment of the main body 1 is completed, it is limited and used normally, so that the height of the main body 1 of the electric hoist can be adjusted more conveniently;

When the length of the strut assembly needs to be adjusted, it is only necessary to remove the fixing bolts between the inner end block 26 and the main strut 12, so that the inner end block 26 can slide inside the rod groove 25. When the top end of the main stay 12 moves, the length of the extension of the telescopic stay 2 will gradually extend, and when the inner end block 26 moves toward the bottom of the main stay 12, the length of the extension of the extension The length will gradually shorten, thereby changing the length of the entire strut assembly. After adjusting the length of the strut assembly to a suitable length, it is only necessary to align the circular through hole 27 with the nearest adjustment bolt hole 11, and then pass the bolt through The interior of the main strut 12 and the inner end block 26 are fixed with nuts, so that the telescopic strut 2 can be fixed, so as to complete the adjustment of the length of the strut assembly, and the position of the electric hoist main body 1 in the horizontal direction can be adjusted. Thus, the subsequent use is facilitated, and the problem of inconvenience caused to the subsequent use of the electric hoist main body 1 due to the too short length of the strut assembly is avoided.

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

Claims (7)

1. The utility model provides a lifting device for electric hoist, includes electric hoist main part (1), wall vaulting pole (5) and vaulting pole subassembly, the vaulting pole subassembly includes flexible vaulting pole (2) and main vaulting pole (12), and is provided with adjustable fixed establishment between flexible vaulting pole (2) and main vaulting pole (12), the top surface at flexible vaulting pole (2) is fixed in electric hoist main part (1), the surface cover of wall vaulting pole (5) is equipped with brace (6), and one side of brace (6) is equipped with side block (10) of integral type, the bottom and the side block (10) swivelling joint of main vaulting pole (12), its characterized in that: the wall bracing column is characterized in that a rectangular inner sliding groove (13) is formed in the wall bracing column (5), a base block groove (18) is formed in the bracing sleeve (6), an inner base block (19) is arranged in the base block groove (18), two tension spring chambers (16) are symmetrically formed in the bracing sleeve (6), the two tension spring chambers (16) are respectively located on two sides of the base block groove (18), a pull plate (15) is connected to the inner portion of each tension spring chamber (16), connecting blocks (21) are symmetrically arranged on two side surfaces of each inner base block (19), the top ends of the connecting blocks (21) are fixedly welded with the pull plate (15), strip-shaped sliding ways corresponding to the connecting blocks (21) are symmetrically formed in two sides of the base block groove (18), an integrated limiting clamping rod (14) is arranged on the top end of each inner base block (19), a plurality of adjusting clamping holes (8) matched with the limiting clamping rods (14) are uniformly formed in the front surface of the wall bracing column (5), and the top of spacing kelly (14) runs through to the inside of spout (13) in the rectangle, the front surface of brace cover (6) is provided with horizontal pull block (7), just the inboard of horizontal pull block (7) is fixed with rotatable pull rod (17), the top of rotatable pull rod (17) is located the inside in base block groove (18), and the top and interior base block (19) swivelling joint of rotatable pull rod (17).

2. A lifting device for electric hoists, according to claim 1, characterized in that: the adjustable fixing mechanism comprises a rod groove (25) formed in the main supporting rod (12), an integrated inner end block (26) is arranged at the bottom end of the telescopic supporting rod (2), the inner end block (26) is located in the rod groove (25), a circular through hole (27) penetrates through the inner end block (26), a plurality of adjusting bolt holes (11) corresponding to the circular through holes (27) are uniformly formed in the surfaces of the two sides of the main supporting rod (12), and the adjusting bolt holes (11) are communicated with the inside of the rod groove (25).

3. A lifting device for electric hoists, according to claim 1, characterized in that: the top of rotatable pull rod (17) is equipped with the rotatory piece of integral type, and the inside of interior base block (19) is seted up with the rotatory groove of rotatory piece looks adaptation, rotatory piece is in the inside of rotatory inslot.

4. A lifting device for electric hoists, according to claim 1, characterized in that: the pull hole matched with the rotatable pull rod (17) is formed in the front surface of the support sleeve (6), two limiting side blocks (23) are symmetrically arranged on the top end surface of the rotatable pull rod (17), and two side sliding grooves (22) corresponding to the limiting side blocks (23) are symmetrically formed in the two sides of the pull hole.

5. A lifting device for electric hoists, according to claim 1, characterized in that: the two side surfaces of the transverse pulling block (7) are symmetrically provided with integrated positioning blocks, and the front surface of the support sleeve (6) is provided with two strip-shaped positioning grooves parallel to the positioning blocks.

6. A lifting device for electric hoists, according to claim 1, characterized in that: the inside top of spout (13) is provided with slider (24) in the rectangle, one side of slider (24) is provided with lug (4) in the rectangle, and the top of lug (4) is located the outside of wall brace (5), the side of wall brace (5) is seted up and is propped corresponding lug slide (20) of post (5) with the wall, and inside communicating with each other of spout (13) in lug slide (20) and the rectangle, the top swivelling joint of main stay bar (12) has diagonal draw bar (3), just the top of diagonal draw bar (3) and the top swivelling joint of lug (4).

7. A lifting device for electric hoists, according to claim 1, characterized in that: the two ends of the wall bracing column (5) are provided with L-shaped fixing plates (9), and four reserved bolt holes are formed in the L-shaped fixing plates (9) in a penetrating mode.

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