Multifunctional tractor

Abstract

The utility model discloses a multifunctional tractor which comprises a chassis, half-tube shells are arranged on the left side and the right side of the chassis respectively, a base is arranged on the upper portion of each half-tube shell, the two bases are jointly and fixedly connected with a multifunctional frame, one of the multifunctional frame can be provided with a bucket assembly or a fork assembly, and the bucket assembly comprises a bucket large arm and a bucket body. The large bucket arm is hinged to the multifunctional frame through a hinge piece, the fork assembly comprises a large fork arm and a fork body, the multifunctional frame is hinged to a first driving cylinder through the hinge piece, the output end of the first driving cylinder is hinged to the large bucket arm, and the multifunctional frame is hinged to a second driving cylinder through the hinge piece. The output end of the second driving cylinder can be selectively hinged to the bucket body or the pallet fork body. When the multifunctional frame is provided with the bucket assembly, the first driving cylinder drives the bucket large arm to swing, and the second driving cylinder drives the bucket body to swing; when the multifunctional frame is provided with the pallet fork assembly, the second driving cylinder drives the pallet fork body to swing, and therefore shoveling transfer and forking transfer are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tractor technical field, concretely relates to a multifunctional tractor. BACKGROUND

[0002] Tractor is widely used as agricultural traction tool, and agricultural implements are arranged on the tractor as needed to meet the tillage demand of operation personnel, when tilling, the operation personnel drives the tractor, and the tractor in travel pulls the agricultural implement to work the land, in actual use, the operation personnel finds that: when it is needed to shovel and transport crops or soil, if a special loader is purchased, the cost is large, if the box goods or crops are forked and transported, the cost of purchasing a forklift is high, and there is an urgent need for a multifunctional tractor capable of shoveling and transporting and forking and transporting. SUMMARY

[0003] The utility model solves the technical problem that a multifunctional tractor capable of shoveling and transporting and forking and transporting is provided.

[0004] To solve the above technical problem, the utility model includes the chassis, the both sides of the chassis are separately provided with half pipe shell, each half pipe shell is provided with the base on the upper portion, and the structural characteristics are that: two bases are fixedly connected with a multifunctional frame, the multifunctional frame can be provided with a shovel assembly or a fork assembly, the shovel assembly includes a shovel arm and a shovel body hingedly connected to the shovel arm, the shovel arm is hingedly connected to the multifunctional frame through a hinge piece detachably connected to the multifunctional frame, the fork assembly includes a fork arm and a fork body hingedly connected to the fork arm, the multifunctional frame is hingedly connected with a first drive cylinder through a hinge piece detachably connected to the multifunctional frame, the output end of the first drive cylinder is hingedly connected to the shovel arm, the multifunctional frame is hingedly connected with a second drive cylinder through a hinge piece detachably connected to the multifunctional frame, and the output end of the second drive cylinder can be hingedly connected to the shovel body or the fork body.

[0005] With the above structure, the bucket assembly and the fork assembly can be selectively installed on the multifunctional frame. When the fork assembly needs to be installed, the articulated member connected with the bucket arm is disassembled, and then the bucket assembly is separated from the multifunctional frame. Then, the articulated member and the fork assembly are installed on the multifunctional frame. When the bucket assembly needs to be installed, the first fastener connected with the fork arm is disassembled, and then the fork assembly is separated from the multifunctional frame. Then, the articulated member and the bucket assembly are installed on the multifunctional frame. When the multifunctional frame is provided with the bucket assembly, the first driving cylinder drives the bucket arm to swing, so as to adjust the distance between the bucket body and the load. The second driving cylinder drives the bucket body to swing, so as to adjust the posture of the bucket body. The bucket body close to the load scoops up the load or releases the load on the bucket body. When the multifunctional frame is provided with the fork assembly, the fork arm is locked on the multifunctional frame through the first fastener. The second driving cylinder drives the fork body to swing, so as to adjust the angle of the fork body, so as to fork the load.

[0006] Further, the fork arm away from the fork body is detachably connected to the multifunctional frame through a plurality of first fasteners. The articulated member includes a pin shaft seat and a pin shaft body fixed to the pin shaft seat. The pin shaft seat is detachably connected to the multifunctional frame through a second fastener. Through the articulated member, the pin shaft bodies of a plurality of articulated members are respectively used as the articulated points of the bucket arm and the multifunctional frame, the first driving cylinder and the multifunctional frame, and the second driving cylinder and the multifunctional frame. The bucket arm, the first driving cylinder and the second driving cylinder can swing around the pin shaft bodies connected therewith. The detachable function of the pin shaft seat is realized through the second fastener, so that the articulated member can be conveniently disassembled and installed, and the bucket arm, the first driving cylinder and the second driving cylinder can be conveniently disassembled and installed on the multifunctional frame.

[0007] Further, the multifunctional frame comprises two stands, the two stands are arranged on the two bases respectively, and the two stands are connected through the cross frame; the bucket arm or the fork arm is provided with two parts, the two bucket arms are respectively hinged to the two stands through two hinge parts, the two fork arms are respectively detachably connected to the two stands through a plurality of first fasteners, the lower parts of the two bucket arms are jointly hinged to a bucket body, and the lower parts of the two fork arms are jointly hinged to a fork body; the first driving cylinder is provided with two parts, the two first driving cylinders are respectively hinged to the two stands through two hinge parts, and the output ends of the two first driving cylinders are respectively hinged to the two bucket arms; and the second driving cylinder is hinged to the cross frame through a hinge part. By arranging the two stands and the bucket arm, the bucket body can be stably supported; by arranging the two first driving cylinders, the stable driving of the bucket body is ensured, and the stable operation in the lifting and transferring process is ensured. By arranging the two fork arms, the fork body can be stably supported, and the stable operation in the lifting and transferring process is ensured. The second driving cylinder is hinged to the cross frame, the force of the whole multifunctional frame is uniform, the overall service life is improved, and the stable operation of the transferring operation is ensured.

[0008] Further, the stand comprises two first vertical plates arranged at intervals left and right, and the two first vertical plates are connected through a second vertical plate, and the bottom ends of the first vertical plate and the second vertical plate are fixed to the base. By arranging the two first vertical plates and the second vertical plate, the whole stand can be in a U shape or an H shape, and the stand has good structural strength.

[0009] Further, the first fastener and the second fastener are a screw and a nut combination, the stand is provided with a first hole group, a second hole group and a third hole group, the cross frame is provided with a fourth hole group, the first hole group is used for mounting the hinge part hinged to the first driving cylinder, the second hole group is used for mounting the hinge part hinged to the bucket arm, the third hole group is used for penetrating the first fastener, and the fourth hole group is used for mounting the hinge part hinged to the second driving cylinder.

[0010] The first hole group comprises two first through holes arranged on the two first vertical plates, the first through holes are used for penetrating the pin shaft body of the hinge part hinged to the first driving cylinder, and the first hole group further comprises a second through hole arranged on any one of the first vertical plates, and the second through hole is used for penetrating a second fastener;

[0011] The second hole group comprises two third through holes arranged on the two first vertical plates, the third through holes are used for penetrating the pin shaft body of the hinge part hinged to the bucket arm, and the second hole group further comprises a fourth through hole arranged on any one of the first vertical plates, and the fourth through hole is used for penetrating a second fastener;

[0012] The third hole group comprises a plurality of fifth through holes arranged on the first vertical plate;

[0013] The fourth hole group comprises two sixth through holes which are arranged on the cross frame and are used for penetrating a pin shaft body of the hinged member hinged to the second driving cylinder, and the fourth hole group further comprises a seventh through hole arranged on the cross frame and used for penetrating a second fastener. By arranging the first hole group, the second hole group, the third hole group and the fourth hole group, the first through hole, the third through hole and the sixth through hole are used for penetrating the pin shaft body, the second through hole, the fourth through hole and the seventh through hole are used for penetrating a screw in the second fastener, and after a first vertical plate penetrates the screw in the second fastener, the screw in the second fastener is screwed to a nut in the second fastener, so that the installation locking of the hinged member is realized. The fifth through hole is used for penetrating a screw in the first fastener, and after the screw in the first fastener penetrates the fifth through hole and the fork arm, the screw in the first fastener is screwed to a nut in the first fastener, so that the fork arm is locked on the stand.

[0014] Further, the cross frame comprises frame bodies connected to the two stands respectively, and the frame bodies are provided with two lug plates on the front sides thereof, two sixth through holes are arranged on the two lug plates respectively, and one seventh through hole is arranged on each lug plate. By arranging the two lug plates, the pin shaft body of the hinged member hinged to the second driving cylinder is reliably supported by the two lug plates, and the overall structural stability is improved; after a lug plate penetrates a screw in the second fastener, the screw in the second fastener is screwed to a nut in the second fastener, so that the installation locking of the hinged member on the cross frame is realized.

[0015] Further, a reinforcing frame is arranged between the two first vertical plates, the left and right sides of the reinforcing frame contact the two first vertical plates respectively, and the front and back sides of the reinforcing frame are attached to the second vertical plate. By arranging the reinforcing frame, the overall structural strength of the stand is improved.

[0016] In summary, the utility model has the advantages of convenient use and reasonable structure. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic view of the chassis, the base, the multifunctional frame and the reinforcing frame;

[0018] Figure 2 is Figure 1 is a local enlarged view of the A area in FIG. 4;

[0019] Figure 3 is Figure 1 is a local enlarged view of the B area in FIG. 4;

[0020] Figure 4 is a front structural schematic view of the chassis, the multifunctional frame and the reinforcing frame;

[0021] Figure 5is a structural schematic view of a right side of a chassis, a multifunctional frame, a reinforcing frame, a bucket assembly, a first driving cylinder, a second driving cylinder and a pin shaft seat;

[0022] Figure 6 is a structural schematic view of a right side of a chassis, a multifunctional frame, a reinforcing frame, a fork assembly, a second driving cylinder and a pin shaft seat;

[0023] Figure 7 is a structural schematic view of a right side of a chassis, a multifunctional frame, a reinforcing frame, a bucket assembly, a first driving cylinder, a second driving cylinder and a pin shaft seat;

[0024] Figure 8 is Figure 7 is a structural schematic view of a right side of a chassis, a multifunctional frame, a reinforcing frame, a bucket assembly, a first driving cylinder, a second driving cylinder and a pin shaft seat;

[0025] In the figure: 1, chassis; 11, base; 2, multifunctional frame; 21, vertical frame; 211, first vertical plate; 2111, first through hole; 2112, second through hole; 2113, third through hole; 2114, fourth through hole; 2115, fifth through hole; 212, second vertical plate; 22, horizontal frame; 221, sixth through hole; 222, seventh through hole; 3, bucket assembly; 31, bucket arm; 32, bucket body; 4, fork assembly; 41, fork arm; 42, fork body; 5, first driving cylinder; 6, second driving cylinder; 7, pin shaft seat; 8, pin shaft body; 9, reinforcing frame. DETAILED DESCRIPTION

[0026] The utility model will be explained in further detail now in combination with the drawings and embodiments, these drawings are all simplified schematic views, only with the schematic way the basic structure of the utility model is explained, therefore it only shows the related constitution of the utility model. For the convenience of understanding, Figure 4 the upper side is the upper side of the utility model, Figure 4 the lower side is the lower side of the utility model, Figure 4 the left side is the left side of the utility model, Figure 4 the right side is the right side of the utility model, Figure 5 the left side is the front side of the utility model, Figure 5 the right side is the rear side of the utility model.

[0027] Refer to Figures 1 to 8The utility model discloses a chassis 1 can select the TB series of market commonly, and the chassis 1 left and right sides are separately equipped with half pipe shell body, and each half pipe shell body upper portion is equipped with the base 11. Two base 11s commonly fixedly connect a multifunctional frame 2, and the multifunctional frame 2 includes two stands 21, and the two stands 21 are separately arranged on the two bases 11, and the two stands 21 are connected through the crosspiece 22. The multifunctional frame 2 can alternatively be provided with the shovel assembly 3 or the fork assembly 4. The shovel assembly 3 includes the shovel big arm 31, the shovel body 32 hinged on the shovel big arm 31, and the shovel big arm 31 is hinged on the multifunctional frame 2 through the hinge piece detachably connected on the multifunctional frame 2. The fork assembly 4 includes the fork big arm 41 detachably connected on the multifunctional frame 2, and the fork body 42 hinged on the fork big arm 41. The fork body 42 includes the mounting frame, the lifting piece arranged on the mounting frame and the fork arranged on the lifting piece, and the fork can move up and down through the lifting piece. The fork body 42 is the general component in the field of forklift, and its structure principle is known to the skilled person, and will not be repeated here.

[0028] Referring to Figures 1 to 8 Among the side of the fork big arm 41 close to the fork body 42 and the side of the fork big arm 41 away from the fork body 42, the side of the fork big arm 41 away from the fork body 42 is detachably connected on the multifunctional frame 2 through the first fastener. The hinge piece includes the pin shaft seat 7 and the pin shaft body 8 fixedly connected on the pin shaft seat 7, and the pin shaft seat 7 is detachably connected on the multifunctional frame 2 through the second fastener. The shovel big arm 31 or the fork big arm 41 is equipped with two, and the two shovel big arms 31 are respectively hinged on the two stands 21 through the two hinge pieces, and the two fork big arms 41 are respectively detachably connected on the two stands 21 through the first fastener. The lower part of the two shovel big arms 31 commonly hingedly connects the shovel body 32, and the lower part of the two fork big arms 41 commonly hingedly connects the fork body 42. The first drive cylinder 5 is equipped with two, and the two first drive cylinders 5 are respectively hinged on the two stands 21 through the two hinge pieces, and the output end of the two first drive cylinders 5 is respectively hinged on the two shovel big arms 31, and the second drive cylinder 6 is hinged on the crosspiece 22 through the hinge piece. The multifunctional frame 2 is hinged with the first drive cylinder 5 through the hinge piece detachably connected on the multifunctional frame 2, and the output end of the first drive cylinder 5 is hinged on the shovel big arm 31, and the multifunctional frame 2 is hinged with the second drive cylinder 6 through the hinge piece detachably connected on the multifunctional frame 2, and the output end of the second drive cylinder 6 can alternatively be hinged on the shovel body 32 or the fork body 42. When the output end of the second drive cylinder 6 needs to be hinged on the shovel body 32 or the fork body 42, the common hinge shaft on the market can be selected to be quickly installed. The first drive cylinder 5 and the second drive cylinder 6 can select the hydraulic cylinder. In actual use, when the multifunctional frame 2 is provided with the fork assembly 4, the first drive cylinder 5 can be detached or hung on the stand 21 through the hinge piece.

[0029] Referring to Figures 1 to 8The stand 21 comprises two first vertical plates 211 arranged at intervals, and the two first vertical plates 211 are connected by a second vertical plate 212, and the bottom ends of the first vertical plate 211 and the second vertical plate 212 are fixedly connected to the base 11. The first fastener and the second fastener are a screw-nut combination. The stand 21 is provided with a first hole group, a second hole group, and a third hole group, and the cross frame 22 is provided with a fourth hole group. The first hole group is used for mounting a hinge member hinged to the first driving cylinder 5, the second hole group is used for mounting a hinge member hinged to the bucket arm 31, the third hole group is used for penetrating a plurality of first fasteners, and the fourth hole group is used for mounting a hinge member hinged to the second driving cylinder 6. The first hole group comprises two first through holes 2111 arranged on the two first vertical plates 211, and the first through holes 2111 are used for penetrating the pin shaft body 8 of the hinge member hinged to the first driving cylinder 5. The first hole group further comprises a second through hole 2112 arranged on any one of the first vertical plates 211, and the second through hole 2112 is used for penetrating a second fastener. The second hole group comprises two third through holes 2113 arranged on the two first vertical plates 211, and the third through holes 2113 are used for penetrating the pin shaft body 8 of the hinge member hinged to the bucket arm 31. The second hole group further comprises a fourth through hole 2114 arranged on any one of the first vertical plates 211, and the fourth through hole 2114 is used for penetrating a second fastener. The third hole group comprises a plurality of fifth through holes 2115 arranged on the first vertical plate 211. The fifth through hole 2115 can be arranged on any one of the first vertical plates 211 or on both of the first vertical plates 211. The fourth hole group comprises two sixth through holes 221 arranged at intervals on the cross frame 22, and the sixth through holes 221 are used for penetrating the pin shaft body 8 of the hinge member hinged to the second driving cylinder 6. The fourth hole group further comprises a seventh through hole 222 arranged on the cross frame 22 and used for penetrating a second fastener. The cross frame 22 comprises a frame body connected to the two stands 21 at the left and right ends, respectively, and the frame body is provided with two lug plates arranged at intervals on the front side. The two sixth through holes 221 are arranged on the two lug plates, and the seventh through hole 222 is arranged on any one of the lug plates. The two first vertical plates 211 are provided with a reinforcing frame 9, and the left and right sides of the reinforcing frame 9 respectively contact the two first vertical plates 211. Any one of the front and rear sides of the reinforcing frame 9 is attached to the second vertical plate 212. The reinforcing frame 9 can be made of two square tubes.

[0030] The utility model discloses a multifunctional frame 2, the first driving cylinder 5, the second driving cylinder 6, the hinge piece, the bucket assembly 3 and the fork assembly 4 are arranged on the multifunctional frame 2, the first driving cylinder 5 is connected with the bucket arm 31, the second driving cylinder 6 is connected with the bucket body 32, the hinge piece is connected with the bucket arm 31 and the multifunctional frame 2, the fork assembly 4 is connected with the fork arm 41 and the multifunctional frame 2, when the multifunctional frame 2 sets the bucket assembly 3, the first driving cylinder 5 drives the bucket arm 31 swing to adjust the spacing of the bucket body 32 and the loading and unloading object, and the second driving cylinder 6 drives the bucket body 32 swing to adjust the posture of the bucket body 32, makes the bucket body 32 close to the loading and unloading object and shovel or makes the bucket body 32 with loading and unloading object and release loading and unloading object, when the multifunctional frame 2 sets the fork assembly 4, the first driving cylinder 5 drives the fork arm 41 swing to adjust the angle of the fork body 42 to fork loading and unloading object.

[0031] The utility model provides a kind of multifunctional tractor, by setting hinge piece, the pin shaft body 8 of several hinge pieces is respectively as the hinge point of bucket arm 31 and multifunctional frame 2, first driving cylinder 5 and multifunctional frame 2, second driving cylinder 6 and multifunctional frame 2, bucket arm 31, first driving cylinder 5 and second driving cylinder 6 can swing around pin shaft body 8 connected with it.

[0032] By setting the first hole group, the second hole group, the third hole group and the fourth hole group, the first through hole 2111, the third through hole 2113 and the sixth through hole 221 are used for penetrating the pin shaft body 8, the second through hole 2112, the fourth through hole 2114 and the seventh through hole 222 are used for penetrating the screw in the second fastener, and after one piece of the first vertical plate 211 penetrates the screw in the second fastener, the screw nut in the second fastener is screwed to the screw in the second fastener, so as to realize the installation and locking of the hinge piece. The fifth through hole 2115 is used for penetrating the screw in the first fastener, and after the screw in the first fastener penetrates the fifth through hole 2115 and the fork arm 41, the screw nut in the first fastener is screwed to the screw in the first fastener, so as to lock the fork arm 41 on the stand 21. By setting two lug plates, the pin shaft body 8 of one piece of the hinge piece hinged to the second drive cylinder 6 is reliably supported by the two lug plates, and the overall structural stability is improved; one piece of the lug plate penetrates the screw in the second fastener, and the screw nut in the second fastener is screwed to the screw in the second fastener, so as to realize the installation and locking of one piece of the hinge piece on the cross frame 22. By setting the reinforcing frame 9, the overall structural strength of the stand 21 is improved.

[0033] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the utility model or exceed the range defined by the claims of the patent, which shall belong to the protection scope of the utility model.

Claims

1. A multi-functional tractor comprising a chassis (1), half-pipe housings are arranged on the left and right sides of the chassis (1), a base (11) is arranged on the upper part of each half-pipe housing, characterized in that: Two bases (11) are fixedly connected with a multifunction frame (2), the multifunction frame (2) is selectively provided with a bucket assembly (3) or a fork assembly (4), the bucket assembly (3) comprises a bucket arm (31) and a bucket body (32) hingedly connected to the bucket arm (31), the bucket arm (31) is hingedly connected to the multifunction frame (2) through a hinge connected to the multifunction frame (2) in a detachable manner, the fork assembly (4) comprises a fork arm (41) connected to the multifunction frame (2) in a detachable manner and a fork body (42) hingedly connected to the fork arm (41), the multifunction frame (2) is hingedly connected with a first driving cylinder (5) through a hinge connected to the multifunction frame (2) in a detachable manner, the output end of the first driving cylinder (5) is hingedly connected to the bucket arm (31), the multifunction frame (2) is hingedly connected with a second driving cylinder (6) through a hinge connected to the multifunction frame (2) in a detachable manner, and the output end of the second driving cylinder (6) is selectively hingedly connected to the bucket body (32) or the fork body (42).

2. The utility tractor of claim 1 wherein: The fork arm (41) is detachably connected to the multifunction frame (2) through a plurality of first fasteners on the side away from the fork body (42), the hinge comprises a pin shaft seat (7) and a pin shaft body (8) fixed to the pin shaft seat (7), and the pin shaft seat (7) is detachably connected to the multifunction frame (2) through a second fastener.

3. The utility tractor of claim 2 wherein: The multifunction frame (2) comprises two vertical frames (21), the two vertical frames (21) are arranged on the two bases (11) respectively, and the two vertical frames (21) are connected through a cross frame (22), the bucket arm (31) or the fork arm (41) is provided in two pieces, the two bucket arms (31) are hingedly connected to the two vertical frames (21) through two hinges respectively, the two fork arms (41) are detachably connected to the two vertical frames (21) through a plurality of first fasteners respectively, the lower parts of the two bucket arms (31) are hingedly connected to a bucket body (32) in common, the lower parts of the two fork arms (41) are hingedly connected to a fork body (42) in common, the first driving cylinder (5) is provided in two pieces, the two first driving cylinders (5) are hingedly connected to the two vertical frames (21) through two hinges respectively, and the output ends of the two first driving cylinders (5) are hingedly connected to the two bucket arms (31) respectively, and the second driving cylinder (6) is hingedly connected to the cross frame (22) through a hinge.

4. The utility tractor of claim 3 wherein: The vertical frame (21) comprises two first vertical plates (211) arranged at intervals, and the two first vertical plates (211) are connected through a second vertical plate (212), and the first vertical plate (211) and the second vertical plate (212) are fixed to the base (11) at the bottom end.

5. The utility tractor of claim 4 wherein: The first and second fasteners are screw-nut combinations, the stand (21) is provided with a first hole group, a second hole group, and a third hole group, the crossbar (22) is provided with a fourth hole group, the first hole group is used for mounting a hinged member hinged to the first driving cylinder (5), the second hole group is used for mounting a hinged member hinged to the bucket arm (31), the third hole group is used for penetrating the first fastener, and the fourth hole group is used for mounting a hinged member hinged to the second driving cylinder (6); The first hole group comprises two first through holes (2111) arranged on two first vertical plates (211), the first through holes (2111) are used for penetrating the pin shaft body (8) of the hinged member hinged to the first driving cylinder (5), and the first hole group further comprises a second through hole (2112) arranged on any one of the first vertical plates (211), the second through hole (2112) is used for penetrating a second fastener; The second hole group comprises two third through holes (2113) arranged on the two first vertical plates (211), the third through holes (2113) are used for penetrating the pin shaft body (8) of the hinged member hinged to the bucket arm (31), and the second hole group further comprises a fourth through hole (2114) arranged on any one of the first vertical plates (211), the fourth through hole (2114) is used for penetrating a second fastener; The third hole group comprises a plurality of fifth through holes (2115) arranged on the first vertical plates (211); The fourth hole group comprises two sixth through holes (221) arranged on the crossbar (22) at intervals, the sixth through holes (221) are used for penetrating the pin shaft body (8) of the hinged member hinged to the second driving cylinder (6), and the fourth hole group further comprises a seventh through hole (222) arranged on the crossbar (22) and used for penetrating a second fastener.

6. The utility tractor of claim 5 wherein: The crossbar (22) comprises a frame body connected to the two stands (21) at left and right ends, respectively, the frame body is provided with two lug plates arranged at intervals on the front side, two sixth through holes (221) are arranged on the two lug plates, and the seventh through hole (222) is arranged on any one of the lug plates.

7. The utility tractor of claim 4 wherein: The two first vertical plates (211) are provided with a reinforcing frame (9), the left and right sides of the reinforcing frame (9) respectively contact the two first vertical plates (211), and any one of the front and back sides of the reinforcing frame (9) is attached to the second vertical plate (212).

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