CN221968617U - Waste plastic recycling shredder - Google Patents

Abstract

The utility model discloses a shredder for recycling waste plastics, which comprises supporting legs, wherein one sides of the four groups of supporting legs are fixedly connected with first mounting plates, the four groups of first mounting plates are provided with mounting assemblies, the four groups of mounting assemblies are provided with mounting blocks, a crushed material storage box is fixedly connected between the four groups of mounting blocks, one side of the crushed material storage box is fixedly connected with a first connecting plate, the upper end of the first connecting plate is fixedly connected with a second connecting plate, one side of the second connecting plate is fixedly connected with two groups of electric push rods, the two groups of electric push rods penetrate into the crushed material storage box, and one ends of the two groups of electric push rods are provided with clamping assemblies.

Description

Waste plastic recycling shredder

Technical Field

The utility model belongs to the technical field of waste plastic recycling, in particular to a shredder for recycling waste plastic.

Background Art

A shredder is a machine used for fine crushing, generally used to process unprocessed raw materials or scraps to make them smaller in size. A representative example is to shred plastic or rubber scraps and use them as raw materials after melting and granulation to remake plastic bottles, tires or trash cans, etc. Shredders are used in the plastic recycling industry, and are often used for the crushing of waste large-diameter PE plastic pipes, bales of plastic film, large piles of plastic sheets and head materials. Publication number: CN113600312A discloses a four-axis shredder, which relates to the field of solid waste recycling and crushing technology, and solves the problem that the existing shredder can only crush a single material, has low working efficiency, and has no protection on the feed port, and the splashing of materials during crushing can easily cause injuries to surrounding workers. A four-axis shredder comprises a frame, a shredder case is arranged on the surface of the frame, four axis positioning end sleeves are arranged on the outer surfaces of both ends of the shredder case, a discharge plate is arranged on the bottom surface of the shredder case, a feed hopper is arranged on the upper surface of the shredder case, a shredding mechanism is arranged inside the shredder case, the shredding mechanism comprises two shredding spindles, and a screen is arranged below the two shredding spindles. The present invention effectively improves the shredding efficiency of the shredder by providing the shredding mechanism, the anti-splashing mechanism and the transmission mechanism, can shred a variety of materials, and avoids splashing of materials during shredding, thereby ensuring the safety of workers.

However, there are some problems with the prior art: currently, shredders have been widely used in our daily lives. With the use of plastic shredders, the recycling rate of plastic products has been greatly increased, so that a large amount of plastic can be recycled and reused, saving a lot of resources. However, when the existing shredders are in use, the shredded plastic pieces are often directly scattered on the ground, which is troublesome to collect, wasting a lot of manpower and time. Therefore, it is necessary to provide a shredder that can be easily installed and removed to collect the shredded pieces to prevent the shredded pieces from being scattered all over the ground. In addition, the shredder must also have a function of pushing out the shredded pieces. However, traditional devices can no longer meet people's daily work needs. Therefore, we propose a shredder for recycling waste plastics.

Utility Model Content

In view of the problems existing in the prior art, the utility model provides a shredder for recycling waste plastics, which has the advantage of being able to collect the shredded fragments and eliminating the need for manual cleaning. The shredder has been widely used in our daily life. With the use of plastic shredders, the recycling rate of plastic products has been greatly increased, a large amount of plastic can be recycled, and a large amount of resources have been saved. However, when the existing shredder is in use, the shredded plastic pieces are often directly scattered on the ground, which is troublesome to collect, wasting a lot of manpower and time. Therefore, it is necessary to provide a fragment storage box that can be easily installed and removed on the shredder, which can collect the shredded fragments and prevent the fragments from being scattered all over the ground. The fragment storage box also needs to have a function of pushing out the fragments. However, the traditional device can no longer meet the problem of people's daily work needs.

The utility model is implemented as follows: a shredder for recycling waste plastics comprises legs, one side of four groups of legs are fixedly connected with a first mounting plate, four groups of the first mounting plates are provided with mounting components, four groups of the mounting components are provided with mounting blocks, four groups of the mounting blocks are commonly fixedly connected with a scrap storage box, one side of the scrap storage box is fixedly connected with a first connecting plate, the upper end of the first connecting plate is fixedly connected with a second connecting plate, one side of the second connecting plate is fixedly connected with two groups of electric push rods, the two groups of electric push rods are both extended into the scrap storage box, one end of the two groups of electric push rods is provided with a clamping component, one end of the two groups of the clamping components is commonly provided with a push plate, and the upper end and one side of the scrap storage box are respectively provided with a feed port and a discharge port.

As a preferred embodiment of the utility model, the upper ends of the four groups of legs are commonly fixedly connected to a placement plate, and the upper ends of the placement plate are fixedly connected to a feeding box.

As a preferred embodiment of the utility model, both sides of the feeding box are provided with machine receiving grooves, two groups of the machine receiving grooves are provided with motors, the output ends of the two groups of the motors are fixedly connected with shredding wheels, and the two groups of the shredding wheels are arranged in the feeding box.

As a preferred embodiment of the utility model, the mounting assembly includes a first connecting block, four groups of the first connecting blocks are respectively arranged on the upper ends of four groups of first mounting plates, the upper ends of the four groups of the first connecting blocks are fixedly connected to the second connecting blocks, the upper ends of the four groups of the second connecting blocks are provided with a rotating groove, the four groups of the rotating grooves are provided with a rotating column, and the four groups of the rotating columns are rotatably connected to the third connecting plates.

As a preferred embodiment of the utility model, one end of the four groups of third connecting plates are fixedly connected with a clamping block, the four groups of mounting blocks are provided with through holes, the upper ends of the four groups of first mounting plates are fixedly connected with clamping rods corresponding to the through holes, the upper ends of the four groups of clamping rods are fixedly connected with clamping joints, four groups of springs are arranged in the four groups of clamping blocks, one end of the four groups of springs are fixedly connected with steel balls corresponding to the clamping rods, grooves corresponding to the steel balls are provided around the inner walls of the four groups of clamping blocks, and slots corresponding to the clamping joints are provided on the four groups of clamping blocks.

As a preferred embodiment of the utility model, the clamping assembly includes clamping grooves, two groups of the clamping grooves are respectively fixedly connected to one end of two groups of electric push rods, and fixing blocks are arranged in the two groups of the clamping grooves, and the two groups of the fixing blocks are fixedly connected to one side of the push plate.

As a preferred embodiment of the utility model, the two groups of fixed blocks are fixedly connected to the second mounting plates on both sides, the lower ends of the two groups of second mounting plates are fixedly connected to tension springs, the lower ends of the two groups of tension springs are commonly connected to a clamping plate, the two groups of clamping grooves, fixed blocks and clamping plates are commonly plugged with clamping columns, the clamping grooves, fixed blocks and clamping plates are all provided with clamping holes corresponding to the clamping columns, and the upper ends of the two groups of clamping columns are commonly fixedly connected to a fourth connecting plate.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. The utility model adopts the design of the support legs, the first mounting plate, the mounting assembly, the mounting block, the scrap storage box, the first connecting plate, the second connecting plate, the electric push rod, the clamping assembly and the push plate. When the device is used, plastic is put into the feeding box, and then the motor is rotated to drive the shredding wheel to shred the plastic. The shredded plastic will be sent out from the feeding box and the lower end of the placement plate. Then the scrap storage box can be installed on the first mounting plate by the mounting assembly. During installation, the mounting block is first installed on the clamping rod, and then the third connecting plate is rotated to make the clamping block pass through the clamping joint and be sleeved on the clamping rod. However, after the sleeve is completed, the spring will drive the steel ball to bounce forward, so that it is firmly clamped on the clamping rod to complete the installation of the scrap storage box. However, the clamping assembly can facilitate the installation of the push plate, and the push plate that is dirty due to long-term use can be disassembled and cleaned, so that the shredded plastic can be effectively collected to prevent it from being scattered on the ground.

2. The utility model adopts the design of the legs, the placement plate and the feeding box. The legs can facilitate the placement of the device, and the feeding box on the upper end of the placement plate can be used to feed plastic when the device is in use, and can effectively prevent fragments from splashing, thereby achieving the effect of preventing fragments from splashing and injuring people.

3. The utility model adopts the design of the feeding box, the machine receiving slot, the motor and the shredding wheel. The machine receiving slot can be used to hold the motor. When the motor is running, the output end will drive the two sets of shredding wheels to rotate in opposite directions to shred the plastic, thereby achieving the effect of recycling the plastic by shredding the plastic.

4. The utility model adopts the design of the first connecting block, the first mounting plate, the second connecting block, the rotating column and the third connecting plate. The first mounting plate, the first connecting block and the second connecting block are connected to each other, and the third connecting plate can be rotated on the rotating column in the rotating groove, so that the use of the installation component is convenient. The third connecting plate can be rotated during use to allow the clamping block to be clamped with the clamping rod.

5. The utility model adopts the design of the third connecting plate, the clamping block, the mounting block, the first mounting plate, the clamping rod, the clamping joint, the spring and the steel ball. When using the installation component, the clamping block at one end of the third connecting plate can be clamped on the clamping rod. When clamped, the clamping joint can effectively prevent the clamping block from falling off the clamping rod, and the four groups of springs push the steel balls at the same time to clamp the clamping rod, thereby achieving the effect of installing and disassembling the scrap storage box by adjusting the installation component.

6. The utility model adopts the design of the card slot, the electric push rod, the fixed block and the push plate. When installing the push plate, the fixed block can be placed in the card slot first, and the electric push rod can drive the push plate to move back and forth, so as to facilitate the card connection of the card assembly and push the scraps in the scrap storage box.

7. The utility model adopts the design of the fixed block, the second mounting plate, the tension spring, the clamping plate, the clamping groove, the clamping column and the fourth connecting plate. When using the clamping assembly, the two groups of clamping columns at the lower end of the fourth connecting plate can be inserted into the clamping holes first, and then the second mounting plates on both sides of the fixed block are used to pull the clamping plate upward with the two groups of tension springs at their lower ends, thereby increasing the fit between the fixed block and the clamping groove, thereby achieving the effect of facilitating the disassembly and cleaning of the push plate that has been used for a long time.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic perspective view of the structure of a scrap material storage box provided by an embodiment of the utility model;

FIG2 is a schematic perspective view of a shredding wheel provided in an embodiment of the present utility model;

FIG3 is a schematic perspective view of an installation assembly provided in an embodiment of the present utility model;

FIG4 is a schematic perspective view of a clamping assembly provided in an embodiment of the present utility model;

FIG5 is a schematic perspective view of a push plate provided in an embodiment of the utility model;

FIG. 6 is a schematic three-dimensional diagram of a steel ball provided in an embodiment of the utility model.

In the figure: 1. support leg; 2. first mounting plate; 3. mounting assembly; 301. first connecting block; 302. second connecting block; 303. rotating column; 304. third connecting plate; 305. clamping rod; 306. clamping block; 307. clamping joint; 308. spring; 309. steel ball; 4. placement plate; 5. machine tank; 6. motor; 7. feeding box; 8. shredding wheel; 9. shredded material storage box; 10. mounting block; 11. push plate; 12. clamping assembly; 1201. fourth connecting plate; 1202. clamping slot; 1203. second mounting plate; 1204. clamping plate; 1205. tension spring; 1206. clamping column; 1207. fixing block; 13. first connecting plate; 14. second connecting plate; 15. electric push rod.

DETAILED DESCRIPTION

In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 6, the shredder for recycling waste plastics provided by the embodiment of the utility model includes a support leg 1, one side of four groups of support legs 1 are fixedly connected to a first mounting plate 2, four groups of first mounting plates 2 are provided with mounting components 3, four groups of mounting components 3 are provided with mounting blocks 10, four groups of mounting blocks 10 are commonly fixedly connected to a scrap storage box 9, one side of the scrap storage box 9 is fixedly connected to a first connecting plate 13, the upper end of the first connecting plate 13 is fixedly connected to a second connecting plate 14, one side of the second connecting plate 14 is fixedly connected to two groups of electric push rods 15, the two groups of electric push rods 15 are both extended into the scrap storage box 9, one end of the two groups of electric push rods 15 are provided with a clamping component 12, one end of the two groups of clamping components 12 are commonly provided with a push plate 11, and the upper end and one side of the scrap storage box 9 are respectively provided with a feed port and a discharge port.

The above scheme is adopted: through the design of the support leg 1, the first mounting plate 2, the mounting assembly 3, the mounting block 10, the scrap storage box 9, the first connecting plate 13, the second connecting plate 14, the electric push rod 15, the clamping assembly 12 and the push plate 11, when using the device, plastic is put into the feeding box 7, and then the motor 6 is used to rotate and drive the shredding wheel 8 to shred the plastic. The shredded plastic will be sent out from the feeding box 7 and the lower end of the placement plate 4, and then the scrap storage box 9 can be installed on the first mounting plate 2 using the mounting assembly 3. During installation, the mounting block 1 is firstly 0 is installed on the clamping rod 305, and then the third connecting plate 304 is rotated to make the clamping block 306 pass through the clamping joint 307 and be mounted on the clamping rod 305. However, after the mounting is completed, the spring 308 will drive the steel ball 309 to bounce forward, so that it is firmly clamped on the clamping rod 305, and the installation of the scrap storage box 9 is completed. However, the clamping assembly 12 can facilitate the installation of the push plate 11, and the push plate 11 that is dirty due to long-term use can be disassembled and cleaned, thereby effectively collecting the shredded plastic and preventing it from spilling on the ground.

1 , the upper ends of the four groups of legs 1 are commonly and fixedly connected to a placement plate 4 , and the upper end of the placement plate 4 is fixedly connected to a feeding box 7 .

The above scheme is adopted: through the design of the support leg 1, the placement plate 4 and the feeding box 7, the support leg 1 can facilitate the placement of the device, and the feeding box 7 on the upper end of the placement plate 4 can be used to feed plastic from the feeding box 7 when the device is in use, and can effectively prevent fragments from splashing, thereby achieving the effect of preventing fragments from splashing and injuring people.

1 , machine receiving slots 5 are provided on both sides of the feeding box 7 , motors 6 are provided in the two sets of machine receiving slots 5 , shredding wheels 8 are fixedly connected to the output ends of the two sets of motors 6 , and the two sets of shredding wheels 8 are provided in the feeding box 7 .

The above scheme is adopted: through the design of the feeding box 7, the machine container 5, the motor 6 and the shredding wheel 8, the machine container 5 can be used to hold the motor 6. When the motor 6 is running, the output end will drive the two sets of shredding wheels 8 to rotate in opposite directions to shred the plastic, thereby achieving the effect of recycling the plastic by shredding the plastic.

Referring to Figure 3, the installation component 3 includes a first connecting block 301, and four groups of first connecting blocks 301 are respectively arranged on the upper ends of four groups of first mounting plates 2. The upper ends of the four groups of first connecting blocks 301 are fixedly connected with second connecting blocks 302, and the upper ends of the four groups of second connecting blocks 302 are opened with rotation grooves, and the four groups of rotation grooves are provided with rotation columns 303, and the four groups of rotation columns 303 are rotatably connected with third connecting plates 304.

The above scheme is adopted: through the design of the first connecting block 301, the first mounting plate 2, the second connecting block 302, the rotating column 303 and the third connecting plate 304, the first mounting plate 2, the first connecting block 301 and the second connecting block 302 are connected to each other, and the third connecting plate 304 can be rotated on the rotating column 303 in the rotating groove, so as to facilitate the use of the installation component 3. The third connecting plate 304 can be rotated during use to allow the clamping block 306 to be clamped with the clamping rod 305.

Referring to Figure 3, one end of the four groups of third connecting plates 304 is fixedly connected with a clamping block 306, four groups of mounting blocks 10 are provided with through holes, the upper ends of the four groups of first mounting plates 2 are fixedly connected with a clamping rod 305 corresponding to the through hole, the upper ends of the four groups of clamping rods 305 are fixedly connected with a clamping joint 307, four groups of springs 308 are arranged in the four groups of clamping blocks 306, one end of the four groups of springs 308 is fixedly connected with a steel ball 309 corresponding to the clamping rod 305, grooves corresponding to the steel balls 309 are provided around the inner walls of the four groups of clamping blocks 306, and slots corresponding to the clamping joints 307 are provided on the four groups of clamping blocks 306.

The above scheme is adopted: through the design of the third connecting plate 304, the block 306, the mounting block 10, the first mounting plate 2, the clamping rod 305, the clamping joint 307, the spring 308 and the steel ball 309, when using the installation component 3, the block 306 at one end of the third connecting plate 304 can be clamped on the clamping rod 305. When clamped, the clamping joint 307 can effectively prevent the block 306 from falling off the clamping rod 305, and the four groups of springs 308 push the steel ball 309 at the same time to clamp the clamping rod 305, thereby achieving the effect of installing and disassembling the crushed material storage box 9 by adjusting the installation component 3.

4 , the clamping assembly 12 includes clamping slots 1202 , two sets of clamping slots 1202 are respectively fixedly connected to one end of two sets of electric push rods 15 , and two sets of clamping slots 1202 are each provided with a fixing block 1207 , and the two sets of fixing blocks 1207 are both fixedly connected to one side of the push plate 11 .

The above scheme is adopted: through the design of the clamping groove 1202, the electric push rod 15, the fixed block 1207 and the push plate 11, when installing the push plate 11, the fixed block 1207 can be placed in the clamping groove 1202 first, and the electric push rod 15 can drive the push plate 11 to move forward and backward, thereby achieving the effect of facilitating the clamping of the clamping component 12 and pushing the scraps in the scrap storage box 9.

Referring to Figure 4, the two groups of fixing blocks 1207 are fixedly connected to the second mounting plates 1203 on both sides, the lower ends of the two groups of second mounting plates 1203 are fixedly connected to the tension springs 1205, the lower ends of the two groups of tension springs 1205 are commonly connected to the clamping plate 1204, the two groups of clamping grooves 1202, the fixing blocks 1207 and the clamping plates 1204 are commonly plugged with clamping columns 1206, the clamping grooves 1202, the fixing blocks 1207 and the clamping plates 1204 are all provided with clamping holes corresponding to the clamping columns 1206, and the upper ends of the two groups of clamping columns 1206 are commonly fixedly connected to the fourth connecting plate 1201.

The above scheme is adopted: through the design of the fixed block 1207, the second mounting plate 1203, the tension spring 1205, the clamping plate 1204, the clamping groove 1202, the clamping column 1206 and the fourth connecting plate 1201, when using the clamping assembly 12, the two groups of clamping columns 1206 at the lower end of the fourth connecting plate 1201 can be first inserted into the clamping hole, and then the second mounting plates 1203 on both sides of the fixed block 1207 are used to make the two groups of tension springs 1205 at the lower end pull the clamping plate 1204 upward, thereby increasing the fit between the fixed block 1207 and the clamping groove 1202, thereby achieving the effect of facilitating the disassembly and cleaning of the push plate 11 that has been used for a long time.

The working principle of this utility model:

When in use, plastic is put into the feeding box 7, and then the motor 6 is used to rotate and drive the shredding wheel 8 to shred the plastic. The shredded plastic will be sent out from the feeding box 7 and the lower end of the placement plate 4, and then the scrap storage box 9 can be installed on the first mounting plate 2 using the mounting assembly 3. During installation, the mounting block 10 is first installed on the clamping rod 305, and then the third connecting plate 304 is rotated so that the clamping block 306 passes through the clamping joint 307 and is sleeved on the clamping rod 305. However, after the sleeve is completed, the spring 308 will drive the steel ball 309 to bounce forward, thereby firmly clamping on the clamping rod 305 to complete the installation of the scrap storage box 9. However, the clamping assembly 12 can facilitate the installation of the push plate 11, and the push plate 11 that is dirty due to long-term use can be disassembled and cleaned, thereby effectively collecting the shredded plastic and preventing it from spilling on the ground.

In summary, the shredder for recycling waste plastics, through the structure of the installation component 3, the first connecting block 301, the second connecting block 302, the rotating column 303, the third connecting plate 304, the clamping rod 305, the clamping block 306, the clamping joint 307, the spring 308 and the steel ball 309, solves the problem that the shredder has been widely used in our daily life. With the use of the plastic shredder, the recycling rate of plastic products has been greatly increased, so that a large amount of plastic can be recycled and reused, saving a lot of resources. However, when the existing shredder is in use, the shredded plastic blocks are often directly scattered on the ground, which is troublesome to collect, wasting a lot of manpower and time. Therefore, it is necessary to set a shredder on the shredder that can be easily installed and removed, so that the shredded debris can be collected to prevent the debris from being scattered all over the ground, and the shredded debris storage box must also have the function of pushing out the debris. However, the traditional device can no longer meet the problem of people's daily work needs.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims (7)

1. Waste plastic retrieves and uses shredder including landing leg (1), its characterized in that: four groups landing leg (1) one side is equal fixedly connected with first mounting panel (2), four groups all be provided with installation component (3) on first mounting panel (2), four groups all be provided with installation piece (10) on installation component (3), four groups all be provided with crushed aggregates case (9) jointly between installation piece (10), first connecting plate (13) of crushed aggregates case (9) one side fixedly connected with, first connecting plate (13) upper end fixedly connected with second connecting plate (14), second connecting plate (14) one side fixedly connected with two sets of electric putter (15), two sets of electric putter (15) all run through to in crushed aggregates case (9), two sets of electric putter (15) one end all is provided with joint subassembly (12), two sets of joint subassembly (12) one end all is provided with push pedal (11) jointly, feed inlet and discharge gate have been seted up respectively to crushed aggregates case (9) upper end and one side.

2. The shredder for recycling waste plastics according to claim 1, wherein: the four groups of the upper ends of the supporting legs (1) are fixedly connected with a placing plate (4) together, and the upper ends of the placing plate (4) are fixedly connected with a feeding box (7).

3. The shredder for recycling waste plastics according to claim 2, wherein: the feeding box is characterized in that machine containing grooves (5) are formed in two sides of the feeding box (7), motors (6) are arranged in the two groups of machine containing grooves (5), shredding wheels (8) are fixedly connected to the output ends of the motors (6), and the shredding wheels (8) are arranged in the feeding box (7).

4. The shredder for recycling waste plastics according to claim 1, wherein: the installation component (3) is including first connecting block (301), four sets of first connecting block (301) set up respectively in four first mounting panel (2) upper ends of group, four sets of first connecting block (301) upper end all fixedly connected with second connecting block (302), four sets of the rotation groove has all been seted up to second connecting block (302) upper end, four sets of all be provided with rotation post (303) in the rotation groove, four sets of all rotate on rotation post (303) and be connected with third connecting plate (304).

5. The shredder for recycling waste plastics according to claim 4, wherein: four groups all fixedly connected with fixture block (306) of third connecting plate (304) one end, four groups all offer the through-hole on installation piece (10), four groups all fixedly connected with clamping rod (305) that correspond with the through-hole on first mounting panel (2), four groups all fixedly connected with joint (307) on clamping rod (305), four groups all are provided with four groups spring (308) in fixture block (306), four groups spring (308) one end all fixedly connected with steel ball (309) that correspond with clamping rod (305), four groups all offer the recess that corresponds with steel ball (309) around fixture block (306) inner wall, four groups all offer the slotted hole that corresponds with joint (307) on fixture block (306).

6. The shredder for recycling waste plastics according to claim 1, wherein: the clamping assembly (12) comprises clamping grooves (1202), two groups of clamping grooves (1202) are respectively and fixedly connected to one ends of two groups of electric push rods (15), fixing blocks (1207) are arranged in the two groups of clamping grooves (1202), and the two groups of fixing blocks (1207) are fixedly connected to one side of the push plate (11).

7. The shredder for recycling waste plastics according to claim 6, wherein: two sets of fixed block (1207) both sides all fixedly connected with second mounting panel (1203), two sets of equal fixedly connected with extension spring (1205) of second mounting panel (1203) lower extreme, two sets of extension spring (1205) lower extreme all is connected with joint board (1204) jointly, two sets of joint post (1206) have all been pegged graft jointly on joint groove (1202), fixed block (1207) and joint board (1204), joint hole corresponding with joint post (1206) has all been seted up on joint groove (1202), fixed block (1207) and the joint board (1204), two sets of joint post (1206) upper end all is fixedly connected with fourth connecting plate (1201) jointly.