A solid-liquid separation device

Abstract

The application discloses a solid-liquid separation device, relates to the technical field of solid-liquid separation, and comprises a treatment cylinder, a first motor, a second motor and a centrifugal mesh cylinder. The top end of the treatment cylinder is provided with a top cover which is installed in a lifting mode. A buffer groove is formed in the bottom of the inside of the top cover. A transmission mechanism is arranged in the inside of the treatment cylinder. The transmission mechanism is arranged to lift the mesh disc to move upwards to extrude the material while centrifuging the material in the centrifugal mesh cylinder. When the material is more, part of the material is stored in the buffer groove. When the mesh disc moves downwards, the material in the centrifugal mesh cylinder is centrifuged again. The solid raw material can avoid blocking the holes of the centrifugal mesh cylinder. The above-mentioned parts are used in cooperation with each other to efficiently separate the solid and the liquid. The mesh disc can be lifted to the top end of the centrifugal mesh cylinder to unload the material, so that the solid after the solid-liquid separation can be quickly unloaded.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation technology, specifically a solid-liquid separation device. Background Technology

[0002] The process of separating solids and liquids is called solid-liquid separation. There are four methods of solid-liquid separation: decantation, filtration, centrifugation, and gravity sedimentation. If the density of the precipitate is high or the crystal particles are large, it can settle quickly after standing, so decantation can be used. Filtration is when a mixture of solution and solid is passed through a filter, and the precipitate remains on the filter. The filtered solution is called filtrate. Centrifugation uses the force of centrifugation to separate substances with different weights. Gravity sedimentation is based on the effect of gravity, using the density difference between particles and fluid to cause them to move and settle.

[0003] When using centrifugation for solid-liquid separation, traditional solid-liquid separation devices typically involve placing the raw material into a mesh cylinder, centrifuging it to allow the liquid to pass through the cylinder while the solid remains trapped inside. However, in this type of device, solids can easily clog some of the filter holes on the mesh cylinder, hindering the liquid from passing through under centrifugal force and thus reducing the solid-liquid separation efficiency. Therefore, in order to improve the solid-liquid separation efficiency, a new solid-liquid separation device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a solid-liquid separation device in order to solve the problem of low solid-liquid separation efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a solid-liquid separation device, comprising a processing cylinder, a first motor, a second motor, and a centrifugal screen cylinder. A top cover is installed at the top of the processing cylinder, and a buffer groove is provided at the bottom of the inner side of the top cover. A transmission mechanism extending into the top cover is provided inside the processing cylinder, which is used to drive the centrifugal screen cylinder to rotate while squeezing and compressing the raw material inside the centrifugal screen cylinder.

[0006] The transmission mechanism includes a transmission shaft, a reciprocating lead screw, a transmission rod, a lifting mesh disc, a moving plate, four spring shafts, and four return springs;

[0007] The drive shaft is rotatably mounted inside the processing cylinder. The drive shaft is fixedly connected to the centrifugal mesh cylinder and extends to the bottom of the processing cylinder. The bottom end of the drive shaft is connected to the output end of the first motor. The reciprocating screw is welded to the top end of the drive shaft and extends to the top of the processing cylinder. The drive rod is sleeved on the outer wall of the reciprocating screw. The lifting mesh plate is welded to the bottom end of the drive rod.

[0008] The movable plate is slidably installed inside the buffer groove. Four spring shafts are welded to the top end of the movable plate and penetrate through to the top end of the top cover. Four return springs are sleeved on the outer walls of the four spring shafts.

[0009] As a further scheme of the present invention: a lifting mechanism for driving the top cover to lift and lower is provided on the outer wall of the processing cylinder;

[0010] The lifting mechanism includes a screw rod, a moving rod, a limiting rod and a limiting shaft;

[0011] The screw rod is rotatably installed at one end of the outer wall of the processing cylinder, and the bottom end of the screw rod is connected to the output end of the second motor. The moving rod is threadedly connected to the outer wall of the screw rod, and one end of the moving rod is fixedly connected to one end of the outer wall of the top cover. The limiting shaft is fixedly installed at one end of the outer wall of the processing cylinder far from the screw rod. The limiting rod is slidably installed on the outer wall of the limiting shaft and is fixedly connected to the other end of the outer wall of the top cover.

[0012] As a further scheme of the present invention: a fixed seat is fixedly installed at the bottom end of the processing cylinder. The first motor and the second motor are both fixedly installed on the fixed seat through a frame. The bottom end of the processing cylinder is fixedly connected to a filter box through a bracket. The processing cylinder is communicated with the filter box through a drain pipe. A filter plate is installed inside the filter box, and a water outlet is provided at the bottom of the filter box.

[0013] As a further scheme of the present invention: the connection part between the transmission shaft and the processing cylinder is rotationally connected through a bearing and a sealing ring. A fixed disk is fixedly installed at the inner bottom end of the processing cylinder on the outer wall of the transmission shaft. A connecting cylinder is welded to the inner bottom end of the centrifugal mesh cylinder. The inner wall of the connecting cylinder matches the outer wall of the transmission shaft. The connecting cylinder and the transmission shaft are fixedly connected by bolts. The bottom end of the centrifugal mesh cylinder and the fixed disk are fixedly connected by bolts.

[0014] As a further scheme of the present invention: a sealing ring is fixedly connected to the inner top end of the processing cylinder. A rotating groove matching the outer wall of the centrifugal mesh cylinder is opened at the bottom end of the sealing ring. The outer wall of the top cover matches the inner wall of the sealing ring.

[0015] As a further scheme of the present invention: a rotatable crescent pin is provided inside the transmission rod. The transmission rod has a "Ji" - shaped structure. A limiting groove matching the outer wall of the transmission rod is opened at the central position of the top cover.

[0016] As a further embodiment of the present invention: the movable plate has a ring-shaped structure, the outer wall of the movable plate is in contact with the inner wall of the buffer groove, the spring shaft has a stepped structure, and four circular grooves are provided at the top of the buffer groove, the inner wall of the circular grooves matches the lower outer wall of the spring shaft.

[0017] As a further embodiment of the present invention: a first support frame is fixedly installed on one side of the outer wall of the processing cylinder, the upper vertical section of the first support frame is in the shape of a "7", and the top end of the reciprocating screw is rotatably connected to the first support frame through a bearing.

[0018] As a further embodiment of the present invention: a second support frame and a rotating seat are fixedly installed on one end of the outer wall of the processing cylinder, the top end of the screw is rotatably connected to the second support frame through a bearing, the bottom end of the screw is rotatably connected to the rotating seat through a bearing, a third support frame and a fixing block are fixedly installed on the other end of the outer wall of the processing cylinder, and the two ends of the limiting shaft are respectively fixedly connected to the third support frame and the fixing block.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting up a transmission mechanism, the material is centrifuged in the centrifuge cylinder, while the lifting screen moves upward to squeeze the material. When there is a large amount of material, a portion of the material is collected in the buffer tank. When the lifting screen moves downward, the material in the centrifuge cylinder is mixed and centrifuged again, which can prevent solid raw materials from clogging the holes of the centrifuge cylinder. This cycle is repeated many times. Through the cooperation of the above parts, efficient solid-liquid separation of the material is achieved. The material can be unloaded while the lifting screen is at the top of the centrifuge cylinder, which facilitates the rapid unloading of the solids after solid-liquid separation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a front view of the present invention;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged view of point A in the image;

[0024] Figure 5 For the present invention Figure 3 Enlarged view of point B in the image;

[0025] Figure 6 This is a cross-sectional view of the centrifugal mesh tube of the present invention;

[0026] Figure 7 This is a diagram showing the connection structure between the transmission rod and the lifting mesh disk of the present invention;

[0027] Figure 8 This is a top view of the top cover of the present invention;

[0028] Figure 9 This is a bottom view of the top cover of the present invention.

[0029] In the diagram: 1. Processing cylinder; 2. First motor; 3. Second motor; 4. Centrifugal screen cylinder; 401. Connecting cylinder; 5. Top cover; 501. Buffer tank; 6. Transmission mechanism; 601. Transmission shaft; 602. Reciprocating screw; 603. Transmission rod; 604. Lifting screen; 605. Moving plate; 606. Spring shaft; 607. Return spring; 7. Lifting mechanism; 701. Screw; 702. Moving rod; 703. Limiting rod; 704. Limiting shaft; 8. Fixed plate; 9. Limiting groove; 10. Sealing ring; 11. Fixed seat; 12. Drain pipe; 13. Filter box; 14. Filter plate; 15. Water outlet. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The first motor (YE2-100L-2) and the second motor (YE2-802-2) mentioned in this invention can both be obtained from the market or through private order.

[0032] Please see Figures 1-9 In this embodiment of the invention, a solid-liquid separation device includes a processing cylinder 1, a first motor 2, a second motor 3, and a centrifugal screen cylinder 4. A top cover 5 is installed at the top of the processing cylinder 1. A buffer groove 501 is opened at the bottom of the inside of the top cover 5. A transmission mechanism 6 extending into the top cover 5 is provided inside the processing cylinder 1, which is used to drive the centrifugal screen cylinder 4 to rotate while squeezing and compressing the raw materials inside the centrifugal screen cylinder 4.

[0033] The transmission mechanism 6 includes a transmission shaft 601, a reciprocating lead screw 602, a transmission rod 603, a lifting screen 604, a moving plate 605, four spring shafts 606, and four return springs 607.

[0034] The drive shaft 601 is rotatably installed inside the processing cylinder 1. The drive shaft 601 is fixedly connected to the centrifugal screen cylinder 4 and extends to the bottom of the processing cylinder 1. The bottom end of the drive shaft 601 is connected to the output end of the first motor 2. The reciprocating screw 602 is welded to the top end of the drive shaft 601 and extends to the top of the processing cylinder 1. The drive rod 603 is sleeved on the outer wall of the reciprocating screw 602. The lifting screen 604 is welded to the bottom end of the drive rod 603.

[0035] The movable plate 605 is slidably installed inside the buffer groove 501. Four spring shafts 606 are welded to the top of the movable plate 605 and extend to the top of the top cover 5. Four return springs 607 are sleeved on the outer walls of the four spring shafts 606. The movable plate 605 has a ring-shaped structure. The outer wall of the movable plate 605 fits against the inner wall of the buffer groove 501. The spring shafts 606 have a stepped structure. The top of the buffer groove 501 has four circular grooves. The inner wall of the circular grooves matches the lower outer wall of the spring shafts 606. A first support frame is fixedly installed on one side of the outer wall of the processing cylinder 1. The upper vertical section of the first support frame has a "7" shaped structure. The top of the reciprocating screw 602 is rotatably connected to the first support frame through a bearing.

[0036] In this embodiment: When using this solid-liquid separation device, initially, the lifting screen 604 is kept at the bottom of the centrifugal screen cylinder 4. The material to be separated into solid and liquid is put into the centrifugal screen cylinder 4, and then the top cover 5 is closed. The first motor 2 drives the transmission shaft 601 to rotate, so that the transmission shaft 601 drives the centrifugal screen cylinder 4 to rotate and perform centrifugal solid-liquid separation of the material. At the same time, the transmission shaft 601 drives the reciprocating screw 602 to rotate, so that the transmission rod 603 extends to the outer wall of the reciprocating screw 602 and moves back and forth, so that the transmission rod 603 drives the lifting screen 604 to move up and down back and forth. When the lifting screen 604 moves upward, the lifting screen 604 drives the material inside the centrifugal screen cylinder 4 to be centrifuged and lifted upward at the same time, so that the material is compressed under the squeezing action of the lifting screen 604 and the top cover 5. Further solid-liquid separation is carried out. When there is a large amount of material, the compressed material squeezes the moving plate 605, causing the moving plate 605 to move upward along the inner wall of the buffer tank 501. At the same time as the return spring 607 is compressed, some material enters the buffer tank 501, thus realizing the collection of more material. After the lifting screen 604 moves downward, at the same time as the return spring 607 pushes the moving plate 605 to move down and reset, the moving plate 605 pushes the material in the buffer tank 501 out of the buffer tank 501, so that the material falls back into the centrifugal screen 4 for mixing and centrifugation to separate the solid and liquid. This cycle is repeated many times to achieve efficient solid-liquid separation of the material. The material can also be unloaded when the lifting screen 604 is at the top of the centrifugal screen 4, which facilitates the rapid unloading of the solid after solid-liquid separation.

[0037] Please refer to this carefully. Figure 1 , Figure 2 and Figure 3 The outer wall of the processing cylinder 1 is provided with a lifting mechanism 7 for driving the top cover 5 to rise and fall; the lifting mechanism 7 includes a screw 701, a moving rod 702, a limiting rod 703, and a limiting shaft 704; the screw 701 is rotatably mounted on one end of the outer wall of the processing cylinder 1, and the bottom end of the screw 701 is connected to the output end of the second motor 3; the moving rod 702 is threadedly connected to the outer wall of the screw 701, and one end of the moving rod 702 is fixedly connected to one end of the outer wall of the top cover 5; the limiting shaft 704 is fixedly mounted on the outer wall of the processing cylinder 1. The end of the wall away from the screw 701, the limiting rod 703 is slidably installed on the outer wall of the limiting shaft 704 and fixedly connected to the other end of the outer wall of the top cover 5. The outer wall of the processing cylinder 1 is fixedly installed with a second support frame and a rotating seat. The top end of the screw 701 is rotatably connected to the second support frame through a bearing. The bottom end of the screw 701 is rotatably connected to the rotating seat through a bearing. The outer wall of the processing cylinder 1 is fixedly installed with a third support frame and a fixing block. The two ends of the limiting shaft 704 are fixedly connected to the third support frame and the fixing block, respectively.

[0038] In this embodiment: the screw 701 is driven to rotate by the second motor 3. When the screw 701 rotates, the moving rod 702 moves downward along the outer wall of the screw 701. The moving rod 702 drives the top cover 5 to move downward. At the same time as the top cover 5 moves downward, the limiting rod 703 slides downward along the outer wall of the limiting shaft 704. Through the cooperation of the above parts, the top cover 5 moves downward and is fixedly installed at the top of the centrifugal screen cylinder 4. Similarly, by rotating the screw 701 in the opposite direction, the top cover 5 moves upward to the upper limit, so that the top of the centrifugal screen cylinder 4 is in an open state, which can be used to put in the raw materials for solid-liquid separation and to unload the separated solid raw materials.

[0039] Please refer to this carefully. Figure 1 , Figure 2 , Figure 3 , Figure 5 as well as Figure 6 A fixed base 11 is fixedly installed at the bottom of the treatment cylinder 1. The first motor 2 and the second motor 3 are both fixedly installed to the fixed base 11 through the frame. A filter box 13 is fixedly connected to the bottom of the treatment cylinder 1 through a bracket. The treatment cylinder 1 is connected to the filter box 13 through a drain pipe 12. A filter plate 14 is installed inside the filter box 13. A water outlet 15 is provided at the bottom of the filter box 13. The connection between the drive shaft 601 and the treatment cylinder 1 is rotatably connected by a bearing and a sealing ring. A fixed plate 8 is fixedly installed at the bottom of the inner part of the inner part of the drive shaft 601. A connecting cylinder 401 is welded to the bottom of the inner part of the centrifugal screen cylinder 4. The inner wall of the connecting cylinder 401 matches the outer wall of the drive shaft 601. The connecting cylinder 401 and the drive shaft 601 are fixedly connected by bolts. The bottom of the centrifugal screen cylinder 4 is fixedly connected to the fixed plate 8 by bolts.

[0040] In this embodiment: The treatment cylinder 1, the first motor 2, and the second motor 3 are supported and installed by the fixing base 11. While the first motor 2 drives the transmission shaft 601 to rotate, which in turn drives the fixing disk 8 and the connecting cylinder 401 to rotate, the fixing disk 8 and the connecting cylinder 401 drive the centrifugal mesh cylinder 4 to rotate. The liquid centrifuged out in the treatment cylinder 1 is discharged into the interior of the filtration tank 13 through the drain pipe 12. The filter plate 14 can perform secondary filtration on the centrifuged liquid. The filter plate 14 is made of a 1μm stainless steel sintered filter plate, which has excellent filtration accuracy and filtration impedance. Through the filter plate 14, micron-level filtration of the liquid can be achieved, further improving the quality of solid-liquid separation. Finally, the filtered liquid can be discharged through the water outlet 15.

[0041] Please refer particularly to Figure 3 、 Figure 4 , a sealing ring 10 is fixedly connected to the inner top end of the treatment cylinder 1. A rotating groove matching the outer wall of the centrifugal mesh cylinder 4 is provided at the bottom end of the sealing ring 10. The outer wall of the top cover 5 matches the inner wall of the sealing ring 10.

[0042] In this embodiment: The top end of the centrifugal mesh cylinder 4 is supported by the sealing ring 10 and the rotating groove to rotate stably. When the top cover 5 is moved downward and installed on the inner wall of the sealing ring 10, the top end of the centrifugal mesh cylinder 4 can be sealed. And when the lifting disk 604 is lifted upward to cooperate with the top cover 5, centrifugation of the material can be carried out while simultaneously performing extrusion, improving the efficiency of solid-liquid separation.

[0043] Please refer particularly to Figure 3 、 Figure 7 、 Figure 8 and Figure 9 , a rotatable crescent pin is provided inside the transmission rod 603. The transmission rod 603 has a "Ji" - shaped structure. A limiting groove 9 matching the outer wall of the transmission rod 603 is provided at the center position of the top cover 5.

[0044] In this embodiment: The transmission rod 603 is limited by the limiting groove 9. When the reciprocating screw rod 602 rotates, the transmission rod 603 reciprocates up and down along the outer wall of the reciprocating screw rod 602. The transmission rod 603 drives the lifting disk 604 to reciprocate up and down. At the same time, the transmission rod 603 moves in a limited manner along the inner wall of the limiting groove 9.

[0045] The above - mentioned is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A solid-liquid separation device, comprising a processing cylinder (1), a first motor (2), a second motor (3), and a centrifugal screen cylinder (4), characterized in that, The top of the processing cylinder (1) is equipped with a top cover (5) that is lifted and lowered. The bottom of the top cover (5) is provided with a buffer groove (501). The processing cylinder (1) is provided with a transmission mechanism (6) that extends into the top cover (5) to drive the centrifugal mesh cylinder (4) to rotate while squeezing and compressing the raw materials inside the centrifugal mesh cylinder (4). The transmission mechanism (6) includes a transmission shaft (601), a reciprocating lead screw (602), a transmission rod (603), a lifting mesh plate (604), a moving plate (605), four spring shafts (606), and four return springs (607). The drive shaft (601) is rotatably mounted inside the processing cylinder (1). The drive shaft (601) is fixedly connected to the centrifugal mesh cylinder (4) and extends to the bottom of the processing cylinder (1). The bottom end of the drive shaft (601) is connected to the output end of the first motor (2). The reciprocating screw (602) is welded to the top end of the drive shaft (601) and extends to the top of the processing cylinder (1). The drive rod (603) is sleeved on the outer wall of the reciprocating screw (602). The lifting mesh disk (604) is welded to the bottom end of the drive rod (603). The movable plate (605) is slidably installed inside the buffer groove (501), and the four spring shafts (606) are welded to the top of the movable plate (605) and extend through to the top of the top cover (5). The four reset springs (607) are sleeved on the outer wall of the four spring shafts (606). The outer wall of the processing cylinder (1) is provided with a lifting mechanism (7) for driving the top cover (5) to rise and fall. The lifting mechanism (7) includes a screw (701), a moving rod (702), a limiting rod (703), and a limiting shaft (704). The screw (701) is rotatably mounted on one end of the outer wall of the processing cylinder (1), and the bottom end of the screw (701) is connected to the output end of the second motor (3). The moving rod (702) is threadedly connected to the outer wall of the screw (701), and one end of the moving rod (702) is fixedly connected to one end of the outer wall of the top cover (5). The limiting shaft (704) is fixedly mounted on the outer wall of the processing cylinder (1) away from the screw (701). The limiting rod (703) is slidably mounted on the outer wall of the limiting shaft (704) and fixedly connected to the other end of the outer wall of the top cover (5). When the lifting mesh plate (604) moves upward, the lifting mesh plate (604) drives the materials inside the centrifugal drum (4) to be centrifuged and lifted upward at the same time, so that the materials are compressed under the extrusion of the lifting mesh plate (604) and the top cover (5), and further solid-liquid separation is carried out. And when there is more material, the compressed material extrudes the moving plate (605), causing the moving plate (605) to move upward along the inner wall of the buffer groove (501). While the return spring (607) is stressed and contracts, part of the material enters the buffer groove (501), so as to realize the storage of more materials. After the lifting mesh plate (604) moves downward, while the return spring (607) pushes the moving plate (605) to move downward and reset, the moving plate (605) pushes the material in the buffer groove 501 out of the buffer groove (501), so that the material falls into the centrifugal drum (4) again for mixing and centrifuging for solid-liquid separation. After repeating this cycle many times, efficient solid-liquid separation of the material is achieved.

2. The solid-liquid separation device according to claim 1, characterized in that, A fixed seat (11) is fixedly installed at the bottom end of the treatment cylinder (1). The first motor (2) and the second motor (3) are both fixedly installed on the fixed seat (11) through a frame. The bottom end of the treatment cylinder (1) is fixedly connected to a filter box (13) through a bracket. The treatment cylinder (1) is communicated with the filter box (13) through a drain pipe (12). A filter plate (14) is installed inside the filter box (13). An outlet (15) is arranged at the bottom of the filter box (13).

3. The solid-liquid separation device according to claim 1, characterized in that, The connection part of the transmission shaft (601) and the treatment cylinder (1) is rotationally connected through a bearing and a sealing ring. A fixed disk (8) is fixedly installed at the inner bottom end of the treatment cylinder (1) on the outer wall of the transmission shaft (601). A connecting cylinder (401) is welded at the inner bottom end of the centrifugal drum (4). The inner wall of the connecting cylinder (401) matches the outer wall of the transmission shaft (601). The connecting cylinder (401) and the transmission shaft (601) are fixedly connected by bolts. The bottom end of the centrifugal drum (4) and the fixed disk (8) are fixedly connected by bolts.

4. The solid-liquid separation device according to claim 1, characterized in that, A sealing ring (10) is fixedly connected to the inner top end of the treatment cylinder (1). A rotating groove matching the outer wall of the centrifugal drum (4) is opened at the bottom end of the sealing ring (10). The outer wall of the top cover (5) matches the inner wall of the sealing ring (10).

5. A solid-liquid separation device according to claim 1, characterized in that, A rotatable crescent pin is arranged inside the transmission rod (603). The transmission rod (603) has a "ji" - shaped structure. A limiting groove (9) matching the outer wall of the transmission rod (603) is opened at the central position of the top cover (5).

6. A solid-liquid separation device according to claim 1, characterized in that, The moving plate (605) has an annular structure. The outer wall of the moving plate (605) fits the inner wall of the buffer groove (501). The spring shaft (606) has a stepped structure. Four circular grooves are opened at the top end of the buffer groove (501). The inner wall of the circular groove matches the lower outer wall of the spring shaft (606).

7. A solid-liquid separation device according to claim 1, characterized in that, A first support frame is fixedly installed on one side of the outer wall of the processing cylinder (1). The upper vertical section of the first support frame has a "7" shaped structure. The top end of the reciprocating screw (602) is rotatably connected to the first support frame through a bearing.

8. A solid-liquid separation device according to claim 1, characterized in that, A second support frame and a rotating seat are fixedly installed on one end of the outer wall of the processing cylinder (1). The top end of the screw (701) is rotatably connected to the second support frame through a bearing. The bottom end of the screw (701) is rotatably connected to the rotating seat through a bearing. A third support frame and a fixing block are fixedly installed on the other end of the outer wall of the processing cylinder (1). The two ends of the limiting shaft (704) are fixedly connected to the third support frame and the fixing block, respectively.

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