Feed stirring device for preventing feed from adhering to body wall

Abstract

The present invention relates to the field of feed mixing technology, and specifically to a feed mixing device for preventing feed from adhering to the body wall, comprising a mounting frame and a turning cylinder, wherein a crankshaft is provided in the turning cylinder, support rods are provided on both sides of the crankshaft, the support rods are rotatably connected to the turning cylinder, and the ends of the two support rods passing through the turning cylinder are fixedly connected to the mounting frame; a first stirring blade and a second stirring blade are provided on the side of the crankshaft close to the feeding end and the discharge end of the turning cylinder, respectively. During the operation of the present invention, the cylinder body will turn over to cause the material to tumble and mix, and at the same time, the first stirring blade and the second stirring blade can automatically rotate, thereby stirring and mixing the material in the cylinder body, thereby improving the mixing efficiency and uniformity of the material; and during the discharge process of the present invention, the rotation of the first stirring blade and the second stirring blade can scrape off the material adhering to the inner wall of the cylinder body, thereby preventing the material adhering to the inner wall of the cylinder body from being unable to be discharged, thereby causing a waste of resources.

Description

Technical Field

[0001] The invention relates to the technical field of feed mixing, and in particular to a feed stirring device capable of preventing feed from adhering to a body wall. Background Art

[0002] The double cone mixer is a high-efficiency, fine container rotary and stirring mixing machine. It is mainly used for uniform mixing of various powdered and granular materials with a high degree of mixing. It is suitable for industries such as magnetic powder, ceramics, chemicals, pharmaceuticals, and feed.

[0003] The working process of the double-cone mixer is as follows: the materials to be mixed are placed into the double cone through vacuum conveying or manual feeding. The motor drives the double cone tank to rotate through the reducer. Under the action of gravity and centrifugal force, the rotating double cone causes the materials in the cylinder to tumble and mix turbulently. The materials continue to tumble and diffuse during the rotation process, and finally achieve the effect of uniform mixing, realizing rapid mixing in the cylinder. After mixing is completed, the materials are discharged through the discharge port by their own weight.

[0004] At present, the double-cone feed mixer on the market is affected by factors such as feed viscosity. When in use, it only relies on the rolling of the double cone drum, and the mixing effect is not ideal. In the process of discharging, feed often adheres to the inner wall of the double cone drum and is difficult to discharge. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a feed stirring device that prevents feed from adhering to the body wall, so as to solve the above problem.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A feed stirring device for preventing feed from adhering to body walls comprises a mounting frame and a turning drum, wherein a crankshaft is provided in the turning drum, support rods are provided on both sides of the crankshaft, the support rods are rotatably connected to the turning drum, and the ends of the two support rods passing through the turning drum are fixedly connected to the mounting frame; a first stirring blade and a second stirring blade are respectively provided on the side of the crankshaft close to the feeding end and the side close to the discharging end of the turning drum, both of which are spiral-ribbon stirring blades, and two rotary drive mechanisms are provided on the crankshaft, and the first stirring blade and the second stirring blade are respectively driven and cooperated with the two rotary drive mechanisms; when the turning drum turns over, the crankshaft rotates relative to the turning drum, and the two rotary drive mechanisms respectively drive the first stirring blade and the second stirring blade to rotate, and while the turning drum turns over to cause the material to tumble and mix, the first stirring blade and the second stirring blade stir-mix the material in the drum.

[0008] A conical guide tube is slidably connected in the turning cylinder, and the conical guide tube is located between the discharge end of the turning cylinder and the second stirring blade. An expansion ring is provided between the discharge end of the conical guide tube and the discharge end of the turning cylinder, and a filter is installed on the conical guide tube; a resistance block is provided on the conical guide tube, and the second stirring blade is driven to cooperate with the resistance block; when the expansion ring is expanded, it pushes against the conical guide tube to slide.

[0009] Preferably, the turning cylinder includes a cylinder body, and both ends of the cylinder body are detachably provided with a feed head and a discharge head. The detachable arrangement facilitates the maintenance of objects in the device by the staff.

[0010] Preferably, the rotary drive mechanism includes a connecting rod, a lead screw and a sleeve, one end of the lead screw is inserted into the interior of the sleeve and can slide in the sleeve, the other end of the lead screw is hinged to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the crankshaft; a ball is provided on the inner wall of the sleeve, and the ball slides in cooperation with the spiral groove of the lead screw, and when the lead screw slides in the sleeve, it drives the sleeve to rotate.

[0011] Preferably, a positioning frame is provided on one of the sleeves, and the positioning frame is rotatably connected to the inner wall of the cylinder; it also includes a mounting shell, which is located outside the crankshaft and serves as an isolation. The support rod and the sleeve are both rotatably connected to the mounting shell.

[0012] Preferably, the lead screw close to the feed head is a reciprocating lead screw.

[0013] Preferably, a discharge barrel is provided at the outlet end of the discharge sealing head, a discharge valve is provided at the bottom of the discharge barrel, and a liquid outlet hole is provided on the inner bottom wall of the discharge barrel.

[0014] Preferably, the expansion ring includes a fixed ring, which is fixed on the inner bottom wall of the discharge barrel. A guide groove is provided on the side of the fixed ring close to the conical guide barrel. A telescopic ring is fixedly connected to the outlet of the conical guide barrel. The other end of the telescopic ring is inserted into the guide groove and can slide in the guide groove. A spring is installed between the inner bottom wall of the guide groove and the telescopic ring. When air is inflated into the guide groove, the telescopic ring extends and pushes the conical guide barrel away from the discharge head.

[0015] Preferably, it also includes an inflation device, which is installed on any one of the cylinder and the discharge head. An air pipe is provided on the fixed ring, and the other end of the air pipe is fluidically connected to the output end of the inflation device. The inflation device can inflate air into the guide groove through the air pipe.

[0016] Preferably, the outer edges of the first stirring blade and the second stirring blade are in contact with the inner wall of the cylinder.

[0017] Preferably, it also includes a transmission tube fixed on the cylinder, the transmission tube is coaxially sleeved on the support rod, and a flipping device is installed on the mounting frame. The flipping device is driven and connected to the transmission tube. When the flipping device drives the transmission tube to rotate, the cylinder is flipped with the transmission tube as the axis.

[0018] The beneficial effects of the present invention are:

[0019] 1. During the working process of the present invention, the cylinder will flip to cause the material to tumble and mix. At the same time, the first stirring blade and the second stirring blade can automatically rotate to stir and mix the material in the cylinder, thereby improving the mixing efficiency and uniformity of the material; and during the discharge process of the present invention, the first stirring blade and the second stirring blade can rotate to scrape off the material adhering to the inner wall of the cylinder, preventing the material from adhering to the inner wall of the cylinder and being unable to be discharged, thereby causing a waste of resources.

[0020] 2. The present invention sets the lead screw close to the feed head as a reciprocating lead screw. That is, during the operation of the present invention, the first stirring blade rotates unidirectionally, while the second stirring blade rotates bidirectionally. This enables the present invention to have two stirring and mixing states, thereby realizing the same-direction flow mixing of materials in area a and materials in area b, and the counter-flow mixing of materials in area a and materials in area b, thereby further improving the uniformity of mixing.

[0021] 3. The present invention realizes the change of the position of the conical guide tube through the coordinated arrangement of the expansion ring, the filter screen and the inflation device, so as to facilitate the dehydration of the material; the present invention integrates the soaking, dehydration and mixing functions into one, is suitable for the processing of dry feed, and improves the practicality of the device; and in the discharge process of the present invention, the cylinder swings slightly, and the first stirring blade and the second stirring blade rotate slightly, which can reduce the possibility of clogging of the discharge valve; and in the later stage of discharging, the conical guide tube automatically swings up and down to prevent it from being affected by factors such as friction, which may cause a large amount of material to remain on the conical guide tube and be unable to be discharged, thereby causing waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a schematic cross-sectional structural diagram of the turning cylinder of the present invention.

[0024] Figure 3 For the present invention Figure 2 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0025] Figure 4 For the present invention Figure 2 Schematic diagram of the structure with a partial enlargement at point B.

[0026] Figure 5 It is a schematic cross-sectional structural diagram of the sleeve of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the first flow state of the material of the present invention.

[0028] Figure 7 This is a structural schematic diagram of the second flow state of the material of the present invention.

[0029] In the accompanying drawings: 1. Mounting frame; 2. Support rod; 3. Crankshaft; 4. Conical guide tube; 5. First stirring blade; 6. Second stirring blade; 7. Filter screen; 8. Resistance block; 9. Connecting rod; 10. Screw; 11. Sleeve; 12. Positioning frame; 13. Cylinder body; 14. Feed head; 15. Discharge head; 16. Air pipe; 17. Discharge barrel; 18. Discharge valve; 19. Liquid outlet; 20. Fixed ring; 21. Transmission pipe; 22. Ball; 23. Chain; 24. Sprocket; 25. Feed valve; 26. Drain chamber; 27. Guide groove; 28. Telescopic ring; 29. Spring; 30. Mounting shell. DETAILED DESCRIPTION

[0030] The following will refer to Figures 1 to 7 The embodiments of the present invention are described in detail. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] A feed stirring device for preventing feed from adhering to the body wall, such as Figure 1 and Figure 2 As shown, it includes a mounting frame 1 and a turning cylinder. The turning cylinder includes a cylinder body 13, and the two ends of the cylinder body 13 are detachably provided with a feed head 14 and a discharge head 15. In this embodiment, the feed head 14 and the discharge head 15 are connected to the two ends of the cylinder body 13 by bolts. A crankshaft 3 is provided in the turning cylinder, and support rods 2 are provided on both sides of the crankshaft 3. The support rods 2 are rotatably connected to the turning cylinder, and one end of the two support rods 2 passing through the turning cylinder is fixedly connected to the mounting frame 1; it also includes a transmission pipe 21 fixed on the cylinder body 13, the transmission pipe 21 is coaxially sleeved on the support rod 2, and a turning device is installed on the mounting frame 1. The turning device is driven and connected to the transmission pipe 21. The turning device includes a chain 23, a sprocket 24 and a servo motor. The servo motor is not drawn, and the servo motor can rotate forward and backward. The sprocket 24 is coaxially fixedly connected to the transmission pipe 21; when the servo motor drives the sprocket 24 to rotate, the turning cylinder rotates with the support rod 2 as the axis, thereby realizing the turning and mixing function of the turning cylinder.

[0032] like Figure 2 、 Figure 3 and Figure 5As shown, the crankshaft 3 is provided with a first stirring blade 5 and a second stirring blade 6 on one side close to the feeding end of the turning cylinder and the other side close to the discharging end, respectively. The first stirring blade 5 and the second stirring blade 6 are both spiral-belt stirring blades. Two rotary drive mechanisms are provided on the crankshaft 3, and the first stirring blade 5 and the second stirring blade 6 are driven and cooperated with the two rotary drive mechanisms respectively; the rotary drive mechanism includes a connecting rod 9, a screw 10 and a sleeve 11, one end of the screw 10 is inserted into the interior of the sleeve 11 and can slide in the sleeve 11, the other end of the screw 10 is hinged to one end of the connecting rod 9, and the other end of the connecting rod 9 is rotatably connected to the crankshaft 3; a ball 22 is provided on the inner wall of the sleeve 11, and the ball 22 slides in cooperation with the spiral groove of the screw 10. While the tumbling drum is turning over to mix the materials, the screw 10 is repeatedly inserted into or withdrawn from the sleeve 11 through the coordinated arrangement of the crankshaft 3, the connecting rod 9, the screw 10 and the sleeve 11, and then the sleeve 11 is rotated in conjunction with the arrangement of the ball 22, thereby realizing the rotation of the first stirring blade 5 and the second stirring blade 6, thereby stirring and mixing the materials in the tumbling drum.

[0033] like Figure 2 、 Figure 3 、 Figure 5-Figure 7 As shown, one of the sleeves 11 is provided with a positioning frame 12, and the positioning frame 12 is rotatably connected to the inner wall of the cylinder 13; it also includes a mounting shell 30, which is located outside the crankshaft 3, and the mounting shell 30 plays an isolation role. The support rod 2 and the sleeve 11 are both rotatably connected to the mounting shell 30; the screw 10 close to the feed head 14 is a reciprocating screw, that is, during the extension and retraction of the screw 10, the corresponding sleeve 11 can only rotate in one direction, that is, the first stirring blade 5 can only rotate in one direction, while the second stirring blade 6 can rotate in both directions, so that during the use of the device, there are two stirring and mixing states, the materials in area a and the materials in area b flow in the same direction to mix, and the materials in area a and the materials in area b flow in opposite directions to perform counter-mixing.

[0034] like Figure 2 and Figure 4As shown, a conical guide tube 4 is slidably connected in the turning cylinder. In this embodiment, a key block is provided on the conical guide tube 4, and a key groove is provided on the inner wall of the cylinder 13. The key block and the key groove are slidably connected. The key block and the key groove are not drawn, that is, the conical guide tube 4 can only slide in the turning cylinder; the conical guide tube 4 is located between the discharge end of the turning cylinder and the second stirring blade 6, an expansion ring is installed between the discharge end of the conical guide tube 4 and the discharge end of the turning cylinder, and a filter screen 7 is installed on the conical guide tube 4. ; A resistance block 8 is provided on the conical guide tube 4, and the second stirring blade 6 is driven to cooperate with the resistance block 8; in the initial state, the side wall of the conical guide tube 4 fits in with the inner wall of the discharge head 15, that is, the liquid in the flip cylinder cannot be discharged from the filter screen 7 at this time. When the expansion ring is unfolded, it pushes the conical guide tube 4 away from the discharge head 15, and a drainage cavity 26 is formed between the conical guide tube 4 and the inner wall of the discharge head 15. At this time, the liquid in the flip cylinder flows into the drainage cavity 26 through the filter screen 7.

[0035] A discharge barrel 17 is provided at the outlet end of the discharge sealing head 15 , a discharge valve 18 is provided at the bottom of the discharge barrel 17 , and a liquid outlet hole 19 is provided on the inner bottom wall of the discharge barrel 17 .

[0036] like Figure 2 and Figure 4 As shown, the expansion ring includes a fixed ring 20, which is fixed on the inner bottom wall of the discharge barrel 17. A guide groove 27 is provided on the side of the fixed ring 20 close to the conical guide barrel 4. A telescopic ring 28 is fixedly connected to the outlet of the conical guide barrel 4. The other end of the telescopic ring 28 is inserted into the guide groove 27 and can slide in the guide groove 27. A spring 29 is installed between the inner bottom wall of the guide groove 27 and the telescopic ring 28. When air is inflated into the fixed ring 20, the telescopic ring 28 extends out, and the spring 29 stretches and accumulates force, thereby pushing the conical guide barrel 4 away from the discharge head 15.

[0037] like Figure 1-Figure 3 As shown, it also includes an inflation device. In this embodiment, the inflation device is an air pump, which is installed on any one of the cylinder 13 and the discharge head 15. An air supply pipe 16 is provided on the fixed ring 20. The air supply pipe 16 is connected to the inside of the guide groove 27. The other end of the air supply pipe 16 is fluidically connected to the output end of the inflation device. An exhaust valve for exhaust is also provided on the fixed ring 20. The exhaust valve is not drawn. After the use of this device is completed, the gas in the guide groove 27 can be discharged through the exhaust valve, and the spring 29 pulls the telescopic ring 28 to retract.

[0038] The outer edges of the first stirring blade 5 and the second stirring blade 6 are both in contact with the inner wall of the cylinder 13. During the rotation of the first stirring blade 5 and the second stirring blade 6, the material on the inner wall of the cylinder 13 can be scraped off to prevent a large amount of material from adhering to the inner wall of the cylinder 13.

[0039] When the device is used, water and dry feed are first placed into the device through the feed valve 25 to soak the dry feed. After the dry feed is soaked, the inflation device is started to inflate the guide groove 27, and the telescopic ring 28 is extended, thereby pushing the conical guide tube 4 away from the discharge head 15, so that a drainage cavity 26 is formed between the inner wall of the conical guide tube 4 and the discharge head 15. Then, the water in the cylinder 13 passes through the filter screen 7, the drainage cavity 26, and the discharge cylinder 17 in sequence, and is finally discharged from the device through the liquid outlet 19, thereby achieving dehydration of the feed.

[0040] Ingredients (such as protein, vitamins and flavorings) are added to the interior of the device through the feed valve 25, and then the servo motor drives the sprocket 24 to rotate, causing the cylinder 13 to rotate with the support rod 2 as the axis, thereby realizing the flipping and mixing function; while the cylinder 13 is flipped to mix the materials, the screw 10 is repeatedly extended and retracted through the coordinated arrangement of the crankshaft 3, the connecting rod 9, the screw 10 and the sleeve 11, and then the sleeve 11 is rotated in conjunction with the arrangement of the ball 22, thereby realizing the rotation of the first stirring blade 5 and the second stirring blade 6, thereby stirring and mixing the materials in the cylinder 13, thereby improving the mixing efficiency and uniformity of the materials.

[0041] It should be noted that the screw 10 near the feed head 14 is a reciprocating screw, that is, during the extension and retraction of the two screws 10, the first stirring blade 5 can only rotate in one direction, while the second stirring blade 6 can rotate in both directions, thereby realizing that during the flipping process of the cylinder 13, the device has two stirring and mixing modes, the materials in area a and the materials in area b flow in the same direction for mixing, and the materials in area a and the materials in area b flow in opposite directions for counter-mixing, which further improves the uniformity of mixing.

[0042] After the mixing of this device is completed, the discharge head 15 and the discharge valve 18 are located at the bottom, and the food trough is placed below the discharge valve 18. The discharge valve 18 is opened and the servo motor is rotated forward and reverse intermittently with a small amplitude. The cylinder 13 swings slightly, and the first stirring blade 5 and the second stirring blade 6 rotate at the same time, which can reduce the possibility of blockage of the discharge valve 18.

[0043] It is worth noting that as the material in the cylinder 13 is continuously discharged, the weight of the material borne by the conical guide tube 4 continues to decrease. Affected by the air pressure in the guide groove 27, the telescopic ring 28 extends, pushes against the conical guide tube 4 to move and approach the second stirring blade 6. After the conical guide tube 4 moves to the set position, when the second stirring blade 6 rotates slightly, it will push against the resistance block 8. It should be noted that at this time the second stirring blade 6 rotates back and forth slightly, causing the conical guide tube 4 to shake up and down to prevent it from being affected by factors such as friction. A large amount of material remains on the conical guide tube 4 and cannot be discharged, thereby causing a waste of resources.

[0044] It should be noted that in the description of the present invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A feed stirring device for preventing feed from adhering to the body wall, comprising a mounting frame (1) and a turning drum, characterized in that: A crankshaft (3) is provided in the turning cylinder, and support rods (2) are provided on both sides of the crankshaft (3), and the support rods (2) are connected to the turning cylinder through rotation, and the ends of the two support rods (2) passing through the turning cylinder are fixedly connected to the mounting frame (1); a first stirring blade (5) and a second stirring blade (6) are provided on the crankshaft (3) near the feeding end and the discharge end of the turning cylinder, respectively, and the first stirring blade (5) and the second stirring blade (6) are both spiral-belt stirring blades. Two rotary drive mechanisms are provided on the crankshaft (3), and the first stirring blade (5) and the second stirring blade (6) are driven and matched with the two rotary drive mechanisms respectively; A conical guide tube (4) is slidably connected in the turning cylinder, and the conical guide tube (4) is located between the discharge end of the turning cylinder and the second stirring blade (6). An expansion ring is provided between the discharge end of the conical guide tube (4) and the discharge end of the turning cylinder, and a filter screen (7) is installed on the conical guide tube (4); a resistance block (8) is provided on the conical guide tube (4), and the second stirring blade (6) is driven to cooperate with the resistance block (8); The turning cylinder comprises a cylinder (13), and a feed seal (14) and a discharge seal (15) are detachably mounted at both ends of the cylinder (13), and a discharge cylinder (17) is disposed at the outlet end of the discharge seal (15); in an initial state, the side wall of the conical guide cylinder (4) is in contact with the inner wall of the discharge seal (15); The expansion ring includes a fixed ring (20), an air delivery pipe (16) is provided on the fixed ring (20), the fixed ring (20) is fixed on the inner bottom wall of the discharge barrel (17), a guide groove (27) is provided on the side of the fixed ring (20) close to the conical guide barrel (4), a telescopic ring (28) is fixedly connected to the outlet of the conical guide barrel (4), the other end of the telescopic ring (28) is inserted into the guide groove (27) and can slide in the guide groove (27), and a spring (29) is installed between the inner bottom wall of the guide groove (27) and the telescopic ring (28); As the material in the cylinder (13) is discharged, the weight borne by the conical guide tube (4) decreases. Under the influence of the air pressure in the guide groove (27), the telescopic ring (28) extends and pushes against the conical guide tube (4) to move to the set position. When the second stirring blade (6) rotates, it pushes against the resistance block (8).

2. A feed stirring device for preventing feed from adhering to the body wall according to claim 1, characterized in that: The rotary drive mechanism comprises a connecting rod (9), a lead screw (10) and a sleeve (11), one end of the lead screw (10) is inserted into the interior of the sleeve (11) and can slide in the sleeve (11), the other end of the lead screw (10) is hinged to one end of the connecting rod (9), and the other end of the connecting rod (9) is rotatably connected to the crankshaft (3); a ball (22) is provided on the inner wall of the sleeve (11), and the ball (22) is slidably matched with the spiral groove of the lead screw (10).

3. A feed stirring device for preventing feed from adhering to the body wall according to claim 2, characterized in that: A positioning frame (12) is provided on one of the sleeves (11), and the positioning frame (12) is rotatably connected to the inner wall of the cylinder (13); and a mounting shell (30) is also included. The mounting shell (30) is located outside the crankshaft (3), and the support rod (2) and the sleeve (11) are both rotatably connected to the mounting shell (30).

4. A feed stirring device for preventing feed from adhering to the body wall according to claim 2, characterized in that: The lead screw (10) close to the feed head (14) is a reciprocating lead screw.

5. The feed stirring device for preventing feed from adhering to the body wall according to claim 1, characterized in that: A discharge valve (18) is provided at the bottom of the discharge barrel (17), and a liquid outlet hole (19) is provided on the inner bottom wall of the discharge barrel (17).

6. A feed stirring device for preventing feed from adhering to the body wall according to claim 1, characterized in that: It also includes an air filling device, which is installed on any one of the cylinder (13) and the discharge head (15), and the other end of the air supply pipe (16) is in fluid communication with the output end of the air filling device.

7. A feed stirring device for preventing feed from adhering to the body wall according to claim 1, characterized in that: The outer edges of the first stirring blade (5) and the second stirring blade (6) are both in contact with the inner wall of the cylinder (13).

8. The feed stirring device for preventing feed from adhering to the body wall according to claim 1, characterized in that: It also includes a transmission tube (21) fixed on the cylinder (13), the transmission tube (21) being coaxially sleeved on the support rod (2), and a turning device being installed on the mounting frame (1), the turning device being drivingly connected to the transmission tube (21).

Images