CN221906605U - A feed raw material mixing device for feed production - Google Patents

Abstract

The utility model relates to the technical field of feed production, in particular to a feed raw material mixing device for feed production; comprises an opening mixing barrel and a supporting bottom plate; the device is characterized in that a mixing assembly is fixedly arranged at the bottom of an opening mixing barrel, a supporting assembly is fixedly arranged in the opening mixing barrel, a rotary discharging assembly is fixedly arranged on the outer side surface of the middle of the opening mixing barrel, a reinforcing assembly is fixedly arranged on the outer side surface of the bottom end of the opening mixing barrel, a collecting assembly is fixedly arranged at the center of the upper surface of a supporting bottom plate, a limiting assembly is fixedly arranged on the upper surface of the right end of the supporting bottom plate, a positioning groove is formed in the upper surface of the left end of the supporting bottom plate, and a taking-out assembly is fixedly arranged on the upper surface of the left end of the supporting bottom plate; solves the technical problems of low utilization rate of feed raw materials and inconvenient use.

Description

A feed raw material mixing device for feed production

Technical Field

The utility model relates to the technical field of feed production, in particular to a feed raw material mixing device for feed production.

Background Art

Feed is a general term for food for animals raised by all people. In a narrower sense, feed mainly refers to food for animals raised in agriculture or animal husbandry. The raw materials for feed production include soybeans, soybean meal, corn, fish meal, amino acids, miscellaneous meal, whey powder, oils, meat and bone meal, grains, feed additives, etc. In the process of feed production, in order to mix various feed production raw materials and to ensure uniform distribution of various nutrients in the produced feed, the feed production raw materials must be mixed. Therefore, a feed raw material mixing device for feed production is needed.

For this purpose, a Chinese patent with publication number CN215028064U discloses a mixing and stirring device for feed processing and production, including a cylinder, the upper parts of both sides of the cylinder are connected with connecting blocks, the upper ends of one side of the two connecting blocks are respectively connected with support plates, and the upper part of one side of one support plate is connected with a first motor; the utility model drives the raw materials located inside the shell to shake by rotating the shell, so that the raw materials can be mixed for the first time, and the mixing speed of the feed raw materials in the later stage is accelerated; the first rotating rod and the second rotating rod are rotated, so that the stirring rod mixes the raw materials, so that the mixing effect of the feed raw materials is good, the quality of feed production is improved, and the efficiency of feed production is improved.

However, in this patent, the feed is discharged through the first discharge pipe arranged at the bottom of the cylinder. Since the bottom wall of the cylinder is flat, when the feed is discharged through the first discharge pipe, the mixed feed materials in the cylinder will not completely flow out along the first discharge pipe. This will make it easy for the mixed feed materials to remain in the cylinder, resulting in waste of feed materials and reducing the utilization rate of feed materials. In addition, in this patent, when the feed is discharged through the first discharge pipe, the mixed feed materials flow out directly. Since there is no collecting device at the bottom of the first discharge pipe, it is impossible to collect the mixed feed materials in a centralized manner, and it is also impossible to use the mixed feed materials by moving the collecting device. Moreover, since the distance between the bottom of the first discharge pipe and the ground is too small, it is also impossible to collect the collecting device externally, which increases the difficulty of using it.

Utility Model Content

The utility model provides a feed raw material mixing device for feed production to solve the problems of low utilization rate and inconvenience in use of feed raw materials in the prior art, which can improve the utilization rate of feed raw materials and is convenient to use.

To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a feed raw material mixing device for feed production, comprising an open mixing barrel and a supporting bottom plate; a mixing assembly is fixedly installed at the bottom of the open mixing barrel, a supporting assembly is fixedly installed inside the open mixing barrel, a rotating discharging assembly is fixedly installed on the middle outer side surface of the open mixing barrel, and the rotating discharging assembly comprises two connecting vertical plates, one side of the two connecting vertical plates are fixedly installed on the middle outer side surface of the open mixing barrel, a third thread groove and a fourth thread groove are respectively provided on the side of the connecting vertical plate away from the open mixing barrel, a convex column is fixedly connected to the side of the connecting vertical plate away from the open mixing barrel, the outer surface of the convex column is rotatably connected to the supporting vertical plate, the supporting vertical plate is rotatably connected to the connecting vertical plate, a first thread groove is provided on the left side of the supporting vertical plate, and a fourth thread groove is provided on the left side of the supporting vertical plate. A third screw is connected to the internal thread, a reinforcement assembly is fixedly installed on the outer side surface of the bottom end of the open mixing barrel, a collecting assembly is fixedly installed at the center of the upper surface of the supporting base plate, the collecting assembly includes a door-shaped long plate, the bottom of the door-shaped long plate is fixedly installed at the center of the upper surface of the supporting base plate, the front inner side surface and the rear inner side surface of the door-shaped long plate are both provided with limited long grooves, an open collecting box is movably installed inside the door-shaped long plate, a second handle is fixedly connected to the top of the open collecting box, a positioning long plate is fixedly connected to the right side of the open collecting box, the front and rear sides of the open collecting box are fixedly connected to a limited long rod, the limiting long rod is movably connected to the limiting long groove, the limiting assembly is fixedly installed on the upper surface of the right end of the supporting base plate, a positioning groove is provided on the upper surface of the left end of the supporting base plate, and a removal assembly is fixedly installed on the upper surface of the left end of the supporting base plate.

Furthermore, the mixing assembly includes a door-shaped plate, the top of the door-shaped plate is fixedly mounted on the bottom of the open mixing barrel, the left side of the door-shaped plate is fixedly connected to a first handle, the top of the first handle is fixedly mounted on the bottom of the open mixing barrel, an electric motor is fixedly mounted inside the door-shaped plate, an output end of the motor is fixedly connected to a rotating shaft, the bottom of the rotating shaft is rotatably mounted on the inner bottom wall of the open mixing barrel, a plurality of mixing blades are fixedly connected to the outer surface of the rotating shaft, and the top of the rotating shaft is fixedly connected to a limiting column.

Furthermore, the support assembly includes two support columns, one end of each of which is fixedly mounted on the inner side of the open mixing barrel, a limiting cylinder is fixedly connected between the other end of one support column and the other end of the other support column, the bottom of the limiting cylinder is rotatably mounted on the top of the rotating shaft, and the limiting column is rotatably mounted inside the limiting cylinder.

Furthermore, the reinforcement assembly includes a limiting ring, an inner side surface of the limiting ring is fixedly mounted on the outer side surface of the bottom end of the open mixing barrel, one end of the limiting ring is fixedly mounted on the left side of a connecting vertical plate, the other end of the limiting ring is fixedly mounted on the left side of another connecting vertical plate, the outer side surface of the limiting ring is fixedly connected to a connecting long plate, the internal thread of the connecting long plate is connected to a first screw, and the first screw is threadedly connected to the first thread groove.

Furthermore, the limit assembly includes a static limit long plate, the bottom of the static limit long plate is fixedly installed on the upper surface of the right end of the supporting base plate, the left side of the static limit long plate is fixedly installed on the right side of the door-shaped long plate, and a positioning long groove is opened on the left side of the static limit long plate, and the positioning long groove is movably connected to the positioning long plate.

Furthermore, the taking-out assembly includes two L-shaped long plates, the bottoms of the two L-shaped long plates are fixedly mounted on the upper surface of the left end of the supporting base plate, the interiors of the two L-shaped long plates are threadedly connected with a second screw, a movable limit long plate is rotatably connected between the two L-shaped long plates, the front and rear sides of the movable limit long plate are provided with second threaded grooves, the second threaded grooves are threadedly connected to the second screw, the bottom ends of the movable limit long plates are rotatably mounted on the upper surface of the positioning column and the bottom left end of the door-shaped long plate respectively, the front and rear sides of the movable limit long plates are fixedly connected with a connecting shaft, the connecting shaft is rotatably mounted inside the L-shaped long plate, the left side of the movable limit long plate is fixedly connected with a positioning column, and the positioning column is movably connected to the positioning groove.

The working principle and use principle of the utility model are as follows: in the process of using the device, the device is made to mix a variety of feed raw materials through the mixing component, and the device is made to rotate to discharge the mixed multiple feed raw materials during discharging through the supporting component, the rotating discharging component and the reinforcing component, thereby avoiding the waste of feed raw materials due to the residual mixed multiple feed raw materials inside the device during discharging, and avoiding the device to reduce the utilization rate of feed raw materials due to the waste of feed raw materials, and in the process of using the device, the device is made to use the mixed multiple feed raw materials by moving the collecting component through the limiting component and the taking-out component, thereby avoiding the device to increase the difficulty of use due to the inability to centrally collect the mixed multiple feed raw materials and the inability to use the mixed multiple feed raw materials by moving the collecting component.

The beneficial technical effects of the utility model are:

By setting the mixing component, the device can mix a variety of feed raw materials. By setting the supporting component, the rotating discharging component and the reinforcing component, the device can rotate to discharge the mixed multiple feed raw materials during discharging, so that the device can avoid the waste of feed raw materials due to the residual mixed multiple feed raw materials inside during discharging, so that the device can avoid reducing the utilization rate of feed raw materials due to the waste of feed raw materials, so that the device can improve the utilization rate of feed raw materials. In addition, by setting the collecting component, the device can centrally collect the mixed multiple feed raw materials. By setting the limiting component and the taking-out component, the device can use the mixed multiple feed raw materials by moving the collecting component, so that the device can avoid the increase in difficulty of use due to the inability to centrally collect the mixed multiple feed raw materials and the inability to use the mixed multiple feed raw materials by moving the collecting component, so that the device can be convenient to use.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

Fig. 1 is a front perspective schematic diagram of the utility model.

FIG. 2 is a perspective schematic diagram of an open mixing barrel of the present invention.

FIG3 is a perspective schematic diagram of the first screw of the utility model.

FIG. 4 is a three-dimensional schematic diagram of a door-shaped long plate of the present invention.

FIG. 5 is a perspective schematic diagram of an open collection box of the present invention.

FIG. 6 is a front cross-sectional schematic diagram of the present utility model.

Explanation of the numbers in the figure: 1. first screw; 2. limiting ring; 3. connecting long plate; 4. open mixing barrel; 5. supporting column; 6. mixing blade; 7. limiting cylinder; 8. rotating shaft; 9. connecting vertical plate; 10. supporting vertical plate; 11. third screw; 12. convex column; 13. supporting bottom plate; 14. door-shaped long plate; 15. open collecting box; 16. second handle; 17. door-shaped plate; 18. connecting shaft; 19. second screw; 20. motor; 21. first handle; 22. positioning groove; 23. positioning column; 24. dynamic limiting long plate; 25. L-shaped long plate; 26. limiting column; 27. third thread groove; 28. fourth thread groove; 29. first thread groove; 30. limiting long groove; 31. positioning long groove; 32. second thread groove; 33. limiting long rod; 34. positioning long plate; 35. static limiting long plate.

DETAILED DESCRIPTION

The following is a further description of a feed raw material mixing device for feed production according to the utility model in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 6: a feed raw material mixing device for feed production, comprising an open mixing barrel 4, a supporting bottom plate 13, a door-shaped plate 17, two supporting columns 5, two connecting vertical plates 9 and a limiting ring 2, a first handle 21 is fixedly connected to the left side of the door-shaped plate 17, a motor 20 is fixedly installed inside the door-shaped plate 17, an output end of the motor 20 is fixedly connected to a rotating shaft 8, a plurality of mixing blades 6 are fixedly connected to the outer surface of the rotating shaft 8, a limiting column 26 is fixedly connected to the top of the rotating shaft 8, one end of the two supporting columns 5 are fixedly installed on the inner side of the open mixing barrel 4, the other end of one supporting column 5 and the other end of the other supporting column 5 are fixedly connected to the limiting cylinder 7, a third thread groove 27 and a fourth thread groove 28 are respectively provided on the side of the connecting vertical plate 9 away from the open mixing barrel 4, a convex column 12 is fixedly connected to the side of the connecting vertical plate 9 away from the open mixing barrel 4, the outer surface of the convex column 12 is rotatably connected to the supporting vertical plate 10, and the supporting vertical plate 10 is fixedly connected to the supporting vertical plate 10. A first thread groove 29 is provided on the left side of the plate 10, and the inner thread of the supporting vertical plate 10 is connected with a third screw rod 11, and the number of the third screw rod 11 is two, and the third screw rod 11 is threadedly connected with the third thread groove 27 and the fourth thread groove 28 respectively, and the outer side surface of the limiting ring 2 is fixedly connected with the connecting long plate 3, and the inner thread of the connecting long plate 3 is connected with the first screw rod 1, and the number of the first screw rod 1 is two, and the first screw rod 1 is threadedly connected with the first thread groove 29. Through the setting of the mixing component, the device can mix a variety of feed raw materials, and through the setting of the supporting component, the rotating discharging component and the reinforcing component, the device can rotate to discharge the mixed multiple feed raw materials during discharging, so that the device can avoid the waste of feed raw materials due to the residual mixed multiple feed raw materials inside during discharging, so that the device can avoid reducing the utilization rate of feed raw materials due to the waste of feed raw materials, and the device can improve the utilization rate of feed raw materials.

When in use, the first screw 1 is threadedly connected to the first thread groove 29, the third screw 11 is threadedly connected to the third thread groove 27, and the second screw 19 is threadedly connected to the second thread groove 32. When the device needs to be used to mix multiple feed raw materials, appropriate amounts of multiple feed raw materials are added to the open mixing barrel 4. After the addition is completed, the motor 20 is started. Under the action of the motor 20, the rotating shaft 8 rotates along the open mixing barrel 4 and the limiting cylinder 7 respectively, the limiting column 26 rotates along the limiting cylinder 7, and the mixing blade 6 rotates. Under the action of the mixing blade 6, The mixing blades 6 stir the various feed materials so that the various feed materials can be mixed. At this time, the device can be used to mix the various feed materials. After the device is used to mix the various feed materials, when the device needs to be used to discharge the mixed various feed materials, the two first screws 1 are rotated at the same time to disconnect the first screw 1 from the first thread groove 29, and the two third screws 11 are rotated at the same time to disconnect the third screw 11 from the third thread groove 27 and one end of the third screw 11 enters the supporting plate 10, and the convex column 12 is used as the center of the circle. The first handle 21 is moved to make the second handle 16, the motor 20 and the open mixing barrel 4 rotate with the convex column 12 as the center of the circle, so that the connecting vertical plate 9 and the convex column 12 rotate along the supporting vertical plate 10. During the rotation of the open mixing barrel 4, the various feed raw materials mixed in the open mixing barrel 4 flow out along the opening of the open mixing barrel 4 as the open mixing barrel 4 rotates. When the fourth thread groove 28 and the third screw 11 correspond to each other, the opening of the open mixing barrel 4 is vertically downward, and the two third screws 11 are rotated in the opposite direction at the same time, so that the third screw 11 and the first screw 11 are connected to each other. The four thread grooves 28 are threadedly connected, so that the mixed multiple feed raw materials can be discharged vertically along the opening of the open mixing barrel 4. At this time, the device can be used to discharge the mixed multiple feed raw materials. In this process, the device can rotate to discharge the mixed multiple feed raw materials during discharging, so that the device can avoid the waste of feed raw materials due to the residual mixed multiple feed raw materials inside during discharging, so that the device can avoid reducing the utilization rate of feed raw materials due to the waste of feed raw materials, so that the device can improve the utilization rate of feed raw materials.

As shown in Figures 1 to 6: a feed raw material mixing device for feed production, comprising an open mixing barrel 4, a supporting bottom plate 13, a door-shaped long plate 14, a static limit long plate 35 and two L-shaped long plates 25, a positioning groove 22 is provided on the upper surface of the left end of the supporting bottom plate 13, the front inner side surface and the rear inner side surface of the door-shaped long plate 14 are both provided with a limit long groove 30, an open collecting box 15 is movably installed inside the door-shaped long plate 14, a second handle 16 is fixedly connected to the top of the open collecting box 15, a positioning long plate 34 is fixedly connected to the right side of the open collecting box 15, the front and rear sides of the open collecting box 15 are both fixedly connected to the limit long rod 33, a positioning long groove 31 is provided on the left side of the static limit long plate 35, and the interiors of the two L-shaped long plates 25 are both threadedly connected with second screws 19, and the number of the second screws 19 is two A movable limit long plate 24 is rotatably connected between the two L-shaped long plates 25, and a second thread groove 32 is provided on the front and rear sides of the movable limit long plate 24, and the second thread groove 32 is threadedly connected to the second screw rod 19. The front and rear sides of the movable limit long plate 24 are fixedly connected with the connecting shaft 18, and the left side of the movable limit long plate 24 is fixedly connected with the positioning column 23. Through the setting of the collecting component, the device can collect the mixed feed raw materials in a centralized manner, and through the setting of the limiting component and the taking-out component, the device can use the mixed feed raw materials by moving the collecting component, so that the device can avoid the increased difficulty of use due to the inability to collect the mixed feed raw materials in a centralized manner and the inability to use the mixed feed raw materials by moving the collecting component, so that the device can be convenient to use.

When in use, in the process of using the device to discharge the mixed multiple feed raw materials, the mixed multiple feed raw materials flow into the open collecting box 15, so that the open collecting box 15 can collect the mixed multiple feed raw materials. After the device completes collecting the mixed multiple feed raw materials, when it is necessary to use the mixed multiple feed raw materials by moving the open collecting box 15, the two second screw rods 19 are rotated at the same time, so that the second screw rod 19 is disconnected from the second thread groove 32 and one end of the second screw rod 19 enters the L-shaped long plate 25, and the movable limit long plate 24 is rotated to rotate along the supporting bottom plate 13, the L-shaped long plate 25 and the door-shaped long plate 14 respectively, and the connecting shaft 18 rotates along the L-shaped long plate 25. When the positioning column 23 enters the positioning groove 22, one side of the movable limit long plate 24 is on the same plane as the inner bottom wall of the door-shaped long plate 14, facing away from the static The limiting long plate 35 pulls the second handle 16 in the opposite direction to disconnect the positioning long plate 34 from the positioning long groove 31, so that the open collecting box 15 slides along the door-shaped long plate 14 and the movable limiting long plate 24 respectively, and the limiting long rod 33 slides along the limiting long groove 30. When the open collecting box 15 is disconnected from the door-shaped long plate 14 and when the limiting long rod 33 is disconnected from the limiting long groove 30, the open collecting box 15 can be taken out. At this time, the open collecting box 15 can be moved to use the mixed feed raw materials. In this process, the device can collect the mixed feed raw materials in a centralized manner, and the device can use the mixed feed raw materials by moving the collection component, so that the device can avoid the increased difficulty of use due to the inability to collect the mixed feed raw materials in a centralized manner and the inability to use the mixed feed raw materials by moving the collection component, so that the device can be convenient to use.

In this embodiment, the motor 20 is electrically connected to the power supply, and the output end of the motor 20 is rotatably installed inside the barrel body of the open mixing barrel 4. The diameter of the output end of the motor 20 is smaller than the diameter of the rotating shaft 8, and the rotating diameter of the mixing blade 6 along the rotating shaft 8 is smaller than the inner diameter of the open mixing barrel 4. The bottom end of the dynamic limit long plate 24 is an arc surface.

Claims (6)

1. A feed raw material mixing device for feed production comprises an opening mixing barrel (4) and a supporting bottom plate (13); the method is characterized in that: the bottom of the opening mixing barrel (4) is fixedly provided with a mixing component, the inside of the opening mixing barrel (4) is fixedly provided with a supporting component, the outer side surface of the middle part of the opening mixing barrel (4) is fixedly provided with a rotary discharging component, the rotary discharging component comprises two connecting vertical plates (9), one sides of the two connecting vertical plates (9) are fixedly arranged on the outer side surface of the middle part of the opening mixing barrel (4), one side of the connecting vertical plates (9) far away from the opening mixing barrel (4) is respectively provided with a third thread groove (27) and a fourth thread groove (28), one side of the connecting vertical plates (9) far away from the opening mixing barrel (4) is fixedly connected with a convex column (12), the outer surface of the convex column (12) is rotationally connected with a supporting vertical plate (10), the supporting vertical plate (10) is rotationally connected with a connecting vertical plate (9), a first thread groove (29) is formed in the left side of the supporting vertical plate (10), a third screw rod (11) is connected with the inner thread of the supporting vertical plate (10), a reinforcing component is fixedly arranged on the outer side surface of the bottom end of the opening mixing drum (4), a collecting component is fixedly arranged at the center of the upper surface of the supporting bottom plate (13), the collecting component comprises a door-shaped long plate (14), the bottom of the door-shaped long plate (14) is fixedly arranged at the center of the upper surface of the supporting bottom plate (13), and a limiting long groove (30) is formed in the front inner side surface and the rear inner side surface of the door-shaped long plate (14), the inside movable mounting of door shape longeron (14) has opening collecting box (15), the top fixedly connected with second handle (16) of opening collecting box (15), the right side fixedly connected with location longeron (34) of opening collecting box (15), the front side and the rear side of opening collecting box (15) all fixedly connected with spacing stock (33), spacing stock (33) and spacing elongated slot (30) swing joint, the right-hand member upper surface fixed mounting of supporting baseplate (13) has spacing subassembly, constant head tank (22) have been seted up to the left end upper surface of supporting baseplate (13), the left end upper surface fixed mounting of supporting baseplate (13) has the subassembly of taking out.

2. A feed raw material mixing apparatus for feed production according to claim 1, wherein: the mixing assembly comprises a door-shaped plate (17), the top of the door-shaped plate (17) is fixedly arranged at the bottom of the opening mixing barrel (4), the left side of the door-shaped plate (17) is fixedly connected with a first handle (21), the top of the first handle (21) is fixedly arranged at the bottom of the opening mixing barrel (4), a motor (20) is fixedly arranged in the door-shaped plate (17), the output end of the motor (20) is fixedly connected with a rotating shaft (8), the bottom of the rotating shaft (8) is rotatably arranged at the inner bottom wall of the opening mixing barrel (4), the outer surface of the rotating shaft (8) is fixedly connected with a plurality of mixing blades (6), and the top of the rotating shaft (8) is fixedly connected with a limiting column (26).

3. A feed raw material mixing apparatus for feed production according to claim 1 or 2, characterized in that: the supporting component comprises two supporting columns (5), one ends of the two supporting columns (5) are fixedly arranged on the inner side face of the opening mixing barrel (4), a limiting barrel (7) is fixedly connected between the other end of one supporting column (5) and the other end of the other supporting column (5), the bottom of the limiting barrel (7) is rotatably arranged at the top of the rotating shaft (8), and the limiting column (26) is rotatably arranged inside the limiting barrel (7).

4. A feed raw material mixing apparatus for feed production according to claim 3, wherein: the reinforcing assembly comprises a limiting ring (2), wherein the inner side surface of the limiting ring (2) is fixedly arranged on the outer side surface of the bottom end of the opening mixing barrel (4), one end of the limiting ring (2) is fixedly arranged on the left side of one connecting vertical plate (9), the other end of the limiting ring (2) is fixedly arranged on the left side of the other connecting vertical plate (9), the outer side surface of the limiting ring (2) is fixedly connected with a connecting long plate (3), the inner thread of the connecting long plate (3) is connected with a first screw rod (1), and the first screw rod (1) is in threaded connection with a first thread groove (29).

5. A feed raw material mixing apparatus for feed production according to claim 1, 2 or 4, characterized in that: the limiting assembly comprises a static limiting long plate (35), the bottom of the static limiting long plate (35) is fixedly arranged on the upper surface of the right end of the supporting bottom plate (13), the left side of the static limiting long plate (35) is fixedly arranged on the right side of the door-shaped long plate (14), the left side of the static limiting long plate (35) is provided with a positioning long groove (31), and the positioning long groove (31) is movably connected with the positioning long plate (34).

6. A feed raw material mixing apparatus for feed production according to claim 5, wherein: the take-out assembly comprises two L-shaped long plates (25), the bottoms of the two L-shaped long plates (25) are fixedly mounted on the upper surface of the left end of a supporting bottom plate (13), second screws (19) are fixedly connected to the bottoms of the two L-shaped long plates (25) in a threaded mode, movable limiting long plates (24) are rotatably connected between the two L-shaped long plates (25), second threaded grooves (32) are formed in the front side and the rear side of the movable limiting long plates (24), the second threaded grooves (32) are in threaded connection with the second screws (19), the bottoms of the movable limiting long plates (24) are rotatably mounted on the upper surface of a positioning column (23) and the left end of the bottom of a door-shaped long plate (14) respectively, connecting shafts (18) are fixedly connected to the front side and the rear side of the movable limiting long plates (24), the connecting shafts (18) are rotatably mounted in the bottoms of the L-shaped long plates (25), and positioning columns (23) are fixedly connected to the left sides of the movable limiting long plates (24), and are movably connected with positioning columns (23) and positioning grooves (22).