Three-screw pump with adjustable pump shell, inlet angle and outlet angle

Abstract

The invention provides a three-screw pump with adjustable pump shell and inlet and outlet angles, and belongs to the technical field of screw pumps. The pump housing includes a discharge body, a suction body, and a plurality of fasteners. The suction body and the discharge body are connected into a whole through the fasteners, the suction body is designed into the suction main body and the rear cover plate in a split manner, and the suction main body comprises the suction inlet, so that when the angle between the suction inlet and the discharge port needs to be adjusted, a worker only needs to loosen a nut and rotate the suction main body, and the angle between the suction inlet and the discharge port can be adjusted. According to the technical scheme, the angle between the suction inlet and the discharge outlet is adjusted, the nut is screwed tightly after the angle between the liquid inlet and the discharge outlet is adjusted, the two ends of the suction body are fastened to the discharge body and the rear cover plate respectively, and the technical problem that the angle of the inlet and the angle of the outlet in the pump shell are fixed and cannot be adjusted in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of screw pumps, and in particular relates to a three-screw pump with adjustable pump casing and inlet and outlet angles. Background Art

[0002] The three-screw pump is characterized by stable flow, small pressure pulsation, strong self-priming ability, low noise, small vibration, high efficiency, compact structure, small size, reliable operation, long life, easy operation and maintenance. It is widely used in ships, electric power, machine tools, elevators, petroleum products, lifting equipment, power equipment, etc. to transport lubricating oil, fuel oil, hydraulic oil, sealing oil and coolant, etc. It has basically replaced piston pumps and gear pumps in ship lubricating oil and fuel oil systems. Since the position and angle of the inlet and outlet of the conventional three-screw pump are fixed, it sometimes cannot meet the user's on-site pipeline layout space requirements. Therefore, in order to meet the various working conditions of the user's on-site inlet and outlet pipeline installation and layout, a three-screw pump structure with an inlet and outlet that can be rotated to any angle for installation is designed to meet the requirements of different users and different on-site installations, especially when used as an on-site replacement pump, which can greatly reduce the engineering workload of on-site pipeline changes. Summary of the invention

[0003] The embodiment of the present invention provides a three-screw pump with adjustable inlet and outlet angles, aiming to solve the technical problem in the prior art that the angles of the inlet and outlet on the pump casing are fixed and cannot be adjusted.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] In a first aspect, a pump housing is provided, the pump housing comprising a discharge body, a suction body and a plurality of fasteners. The discharge body is a tubular cavity structure, a discharge port is provided on a side wall of the discharge body, the discharge port is communicated with an internal cavity of the discharge body, and the discharge port is used to discharge liquid;

[0006] The suction body is a tubular cavity structure, the suction body comprises a suction body and a rear cover plate, the suction body is provided with a suction cavity inside, the suction cavity is communicated with the internal cavity of the discharge body, one end of the suction body abuts against the discharge body; the rear cover plate is provided on a side of the suction body away from the discharge body, the rear cover plate abuts against the suction body, and a plurality of bolt through holes for passing the bolts are also provided on the rear cover plate;

[0007] A plurality of fasteners are arranged at intervals along the circumference of the central axis of the suction body, one end of the fastener is arranged on the discharge body, and the other end of the fastener is passed through the rear cover plate and connected to the rear cover plate.

[0008] In combination with the first aspect, in a possible implementation, the fastener includes a bolt and a nut. One end of the bolt is connected to the discharge body, the rod of the bolt is inserted into the suction chamber, and the other end of the bolt is inserted into the rear cover plate; the nut is threadedly connected to the bolt, and the nut is arranged on a side of the rear cover plate away from the suction body.

[0009] In combination with the first aspect, in a possible implementation manner, the fastener further includes a spring washer, and the spring washer is arranged between the nut and the rear cover plate.

[0010] In combination with the first aspect, in a possible implementation manner, an annular boss is provided on an end surface of the discharge body close to the suction body, and the annular boss is used to support the suction body.

[0011] In a second aspect, a three-screw pump with adjustable inlet and outlet angles includes the pump casing involved in the first aspect.

[0012] In combination with the second aspect, in a possible implementation, the discharge body and the suction body surround a pump cavity, and the inlet and outlet angle adjustable three-screw pump further includes a connecting plate, a pump sleeve, a bearing box and an active screw. The connecting plate is disposed at the other end of the discharge body, the connecting plate is coaxially disposed with the discharge body, and a second through hole is disposed in the middle of the connecting plate. The pump sleeve is embedded in the pump cavity, one end of the pump sleeve is connected to the inner side wall of the discharge body, and the other end of the pump sleeve is disposed in the suction body. The bearing box is disposed on the connecting plate, and the bearing box is provided with a third through hole. The active screw is sequentially passed through the bearing box, the connecting plate and the pump sleeve, one end of the active screw is exposed on the top surface of the bearing box, and the other end of the active screw is spaced apart from the rear cover plate.

[0013] In a possible implementation, the pump sleeve includes a first connection part, a second connection part and a third connection part. The first connection part is a disc-shaped structure, and the outer wall of the first connection part is used to abut against the inner wall of the discharge body. One end of the second connection part is connected to the first connection part, and the outer diameter of the second connection part is smaller than the outer diameter of the first connection part. The second connection part is two arc-shaped plates, and the two arc-shaped plates are arranged at intervals along the circumference of the first connection part. The third connection part is connected to the other end of the second connection part, and the outer diameter of the third connection part is smaller than the outer diameter of the second connection part.

[0014] Wherein, the third connecting portion is provided with a through hole, and the through hole is a large hole and two small holes, the two small holes are symmetrically arranged on both sides of the large hole, and the two small holes are connected to the large hole.

[0015] In a possible implementation, the pump sleeve further includes two reinforcing ribs and a fitting portion. The two reinforcing ribs are symmetrically fixedly arranged between the first connection portion and the third connection portion, and the reinforcing ribs are arranged between the two arc-shaped plates, and the two ends of the reinforcing ribs are respectively connected to the first connection portion and the third connection portion. The fitting portion is an annular structure, the fitting portion is arranged around the third connection portion, an annular groove is provided on the fitting portion, and the fitting portion is connected to the annular inner wall of the annular boss.

[0016] In a possible implementation, the reinforcing rib passes through the fitting portion and is connected to an outer side wall of the third connecting portion.

[0017] In a possible implementation manner, the bearing box and the connecting plate are connected via a first bolt connection structure, and the connecting plate and the discharge body are connected via a second bolt connection structure.

[0018] In the embodiment of the present application, compared with the prior art, the pump housing includes a discharge body, a suction body and a plurality of fasteners. Since the suction body and the discharge body are connected as one body through a plurality of fasteners, and since the suction body is split into two parts, namely, a suction body and a rear cover plate, and the suction body includes a suction port, when it is necessary to adjust the angle between the suction port and the discharge port, the staff only needs to loosen the nut and rotate the suction body to adjust the angle between the suction port and the discharge port, and tighten the nut after the angle between the liquid inlet and the discharge port is adjusted, so that the two ends of the suction body are fastened together with the discharge body and the rear cover plate respectively. This technical solution solves the technical problem in the prior art that the angles of the inlet and outlet on the pump housing are fixed and cannot be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An axonometric view of a three-screw pump with adjustable inlet and outlet angles provided in an embodiment of the present invention;

[0020] Figure 2 A top view of a three-screw pump with adjustable inlet and outlet angles provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of a discharge body provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the structure of the inhalation body provided by an embodiment of the present invention;

[0023] Figure 5 A front view of a three-screw pump with adjustable inlet and outlet angles provided in an embodiment of the present invention;

[0024] Figure 6A structural cross-sectional view of a three-screw pump with adjustable inlet and outlet angles provided in an embodiment of the present invention (excluding the pump sleeve and the active screw);

[0025] Figure 7 A structural cross-sectional view of a three-screw pump with adjustable inlet and outlet angles provided in an embodiment of the present invention;

[0026] Figure 8 The three-dimensional structure of the pump sleeve provided by the embodiment of the present invention Figure 1 ;

[0027] Fig. 9 The three-dimensional structure of the pump sleeve provided by the embodiment of the present invention Figure 2 ;

[0028] Description of reference numerals:

[0029] 1. Discharge body; 11. Discharge outlet; 2. Suction body; 21. Suction outlet; 22. Suction body; 221. Suction chamber; 23. Rear cover; 24. Fastener; 241. Bolt; 242. Nut; 12. Annular boss; 3. Connecting plate; 4. Pump sleeve; 5. Bearing box; 6. Active screw; 41. First connecting part; 42. Second connecting part; 43. Third connecting part; 44. Through hole; 441. Large hole; 442. Small hole; 45. Reinforcement rib; 46. Fitting part; 461. Groove. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0032] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0033] The directions or positional relationships indicated by terms such as “length”, “width”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0035] Please also read Figures 1 to 3 Now, the pump casing and the inlet and outlet angle adjustable three-screw pump provided by the present invention are described.

[0036] In the first aspect, the pump housing includes a discharge body 1, a suction body 2 and a plurality of fasteners 24. The discharge body 1 is a tubular cavity structure, and a discharge port 11 is provided on the side wall of the discharge body 1. The discharge port 11 is connected to the internal cavity of the discharge body 1, and the discharge port 11 is used to discharge the liquid;

[0037] The suction body 2 is a tubular cavity structure, and includes a suction body 22 and a rear cover plate 23. A suction cavity 221 is provided inside the suction body 22, and the suction cavity 221 is communicated with the internal cavity of the discharge body 1. One end of the suction body 22 abuts against the discharge body 1. The rear cover plate 23 is provided on a side of the suction body 22 away from the discharge body 1, and the rear cover plate 23 abuts against the suction body 22. A plurality of bolt 241 through holes for passing bolts 241 are also provided on the rear cover plate 23.

[0038] A plurality of fasteners 24 are arranged at intervals around the central axis of the suction body 22 , one end of the fastener 24 is arranged on the discharge body 1 , and the other end of the fastener 24 is passed through the rear cover plate 23 and connected to the rear cover plate 23 .

[0039] On the basis of the above embodiment, the fastener includes a bolt 241 and a nut 242. One end of the bolt 241 is connected to the discharge body, the rod of the bolt is inserted into the suction chamber and the other end of the bolt 241 is inserted into the rear cover plate 23; the nut 242 is threadedly connected to the bolt 241, and the nut 242 is arranged on the side of the rear cover plate 23 away from the suction body 22.

[0040] Compared with the prior art, the three-screw pump with adjustable inlet and outlet angles provided in this embodiment has a pump housing including a discharge body 1, a suction body 2 and a plurality of fasteners 24. Since the suction body 2 and the discharge body 1 are connected as one body through a plurality of fasteners 24, and since the suction body 2 is split into two parts, namely, a suction body 22 and a rear cover plate 23, and the suction body 22 includes a suction port 21, when it is necessary to adjust the angle between the suction port 21 and the discharge port 11, the staff only needs to loosen the nut 242 and rotate the suction body 22 to adjust the angle between the suction port 21 and the discharge port 11, and after the angle between the liquid inlet and the discharge port 11 is adjusted, the nut 242 is tightened to fasten the two ends of the suction body 22 to the discharge body 1 and the rear cover plate 23, respectively. This technical solution solves the technical problem in the prior art that the angles of the inlet and outlet on the pump housing are fixed and cannot be adjusted.

[0041] Specifically, the fastener 24 also includes a spring washer, which is arranged between the nut 242 and the rear cover plate 23. The function of the spring washer is achieved through its elasticity and oblique friction. It is usually used at the connection of detachable fasteners to prevent them from loosening. The anti-loosening principle of the spring washer is that after the spring washer is flattened, the spring washer will generate a continuous elastic force, so that the threaded connection pair of the nut 242 and the bolt 241 continues to maintain a friction force, generating a resistance torque, thereby preventing the nut 242 from loosening. At the same time, the sharp corners at the opening of the spring washer are embedded in the surface of the bolt 241 and the rear cover plate 23 respectively, thereby preventing the bolt 241 from rotating relative to the rear cover plate 23.

[0042] See also Figure 3 In some embodiments, an annular boss 12 is provided on the end surface of the discharge body 1 close to the suction body 22, and the annular boss 12 is used to support the suction body 22. The provision of the annular boss 12 facilitates the installation between the suction body 22 and the discharge body 1 to be more convenient and quick, and also ensures the coaxiality between the suction body 22 and the discharge body 1.

[0043] Furthermore, a plurality of bolt holes 241 are provided on the outer end surface of the annular boss 12, one end of the bolt 241 is mounted on the bolt hole 241, and the other end of the bolt 241 passes through the rear cover plate 23 and is mounted with the nut 242 and the spring washer. The provision of the bolt hole 241 can make the connection between the bolt 241 and the discharge body 1 more secure.

[0044] Furthermore, an annular support platform is also provided on one side of the rear cover plate 23 close to the suction body 22, and the annular support platform is used to support the suction body 22, so as to ensure the coaxiality between the suction body 22 and the rear cover plate 23 during the installation process and facilitate the installation of the suction body 22 and the discharge body 1, thereby avoiding misalignment of the suction body 22 and the rear cover plate 23.

[0045] In a second aspect, the present invention further includes a three-screw pump with adjustable inlet and outlet angles, and the three-screw pump with adjustable inlet and outlet angles includes the pump casing involved in the technical solution of the first aspect.

[0046] Second, see Figures 5 to 7 On the basis of the above embodiment, the discharge body 1 and the suction body 2 surround a pump cavity, and the inlet and outlet angle adjustable three-screw pump also includes a connecting plate 3, a pump sleeve 4, a bearing box 5 and an active screw 6. The connecting plate 3 is arranged at the other end of the discharge body 1, and the connecting plate 3 is coaxially arranged with the discharge body 1, and a second through hole is arranged in the middle of the connecting plate 3. The pump sleeve 4 is embedded in the pump cavity, one end of the pump sleeve 4 is connected to the inner wall of the discharge body 1, and the other end of the pump sleeve 4 is arranged in the suction body 2. The bearing box 5 is arranged on the connecting plate 3, and the bearing box 5 is provided with a third through hole. The active screw 6 is successively penetrated into the bearing box 5, the connecting plate 3 and the pump sleeve 4, one end of the active screw 6 is exposed on the top surface of the bearing box 5, and the other end of the active screw 6 is spaced apart from the rear cover plate 23.

[0047] During use, a screw pump coupling is installed on the shaft end of the active screw 6 exposed on the top surface of the bearing box 5, and a driving machine coupling is also installed on the shaft end of the driving machine. The three-screw pump and the driving machine are connected through an intermediate common connecting frame. The driving machine coupling drives the screw pump coupling to rotate to suck and discharge liquid, thereby achieving the purpose of conveying liquid.

[0048] A sealing ring is provided between the pump sleeve 4 and the inner circumference of the annular boss 12 , and the sealing ring is used to further seal the pump sleeve 4 and the annular boss 12 .

[0049] See also Figure 8 and Fig. 9 Further, the pump sleeve 4 includes a first connection part 41, a second connection part 42 and a third connection part 43. The first connection part 41 is a disc-shaped structure, and the outer wall of the first connection part 41 is used to abut against the inner wall of the discharge body 1. One end of the second connection part 42 is connected to the first connection part 41, and the outer diameter of the second connection part 42 is smaller than the outer diameter of the first connection part 41. The second connection part 42 is two arc-shaped plates, and the two arc-shaped plates are arranged at intervals along the circumference of the first connection part 41. The third connection part 43 is connected to the other end of the second connection part 42, and the outer diameter of the third connection part 43 is smaller than the outer diameter of the second connection part 42.

[0050] The third connecting portion 43 is provided with a through hole 44 , which includes a large hole 441 and two small holes 442 . The two small holes 442 are symmetrically arranged on both sides of the large hole 441 , and the two small holes 442 are connected to the large hole 441 .

[0051] A driven screw is disposed in each of the two small holes 442, and a driving screw 6 is installed in the large hole 441. The driven screw is meshed with the driving screw 6 for transmission. The driven screw rotates under the drive of the driving screw 6, thereby pumping the oil in the suction body 2 into the discharge body 1. The oil pumped into the discharge body 1 flows out through the gap formed between the two arc plates and is finally pumped out through the discharge port 11.

[0052] On the basis of the above embodiment, the pump sleeve 4 further includes two reinforcing ribs 45 and a fitting portion 46. The two reinforcing ribs 45 are symmetrically fixedly arranged between the first connecting portion 41 and the third connecting portion 43, and the reinforcing ribs 45 are arranged between the two arc-shaped plates, and the two ends of the reinforcing ribs 45 are respectively connected to the first connecting portion 41 and the third connecting portion 43. The fitting portion 46 is an annular structure, and the fitting portion 46 is arranged around the third connecting portion 43, and an annular groove 461 is provided on the fitting portion 46, and the fitting portion 46 is connected to the annular inner wall of the annular boss 12.

[0053] The provision of the reinforcing rib 45 can enhance the connection strength between the first connecting portion 41 and the third connecting portion 43, and the annular structure of the fitting portion 46 can enable the annular outer peripheral side of the fitting portion 46 to better contact the annular inner wall of the annular boss 12, and at the same time, an annular groove 461 is provided on the fitting portion 46, and a sealing ring is placed in the annular groove 461 to further enhance the sealing between the fitting portion 46 and the annular boss 12.

[0054] Furthermore, the reinforcing rib 45 passes through the fitting portion 46 and is connected to the outer side wall of the third connecting portion 43 , so that the connection strength between the reinforcing rib 45 and the third connecting portion 43 is greater.

[0055] On the basis of the above embodiment, the bearing box 5 and the connecting plate 3 are connected by a first bolt connection structure, and the connecting plate 3 and the discharge body 1 are connected by a second bolt connection structure. The bearing box 5 and the connecting plate 3, and the connecting plate 3 and the discharge body 1 are connected by bolts, which facilitates the installation and disassembly of the bearing box 5 and the connecting plate 3.

[0056] This technical solution is not only applicable to liquid environments, but also to gas environments.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump casing, characterized in that: include: The discharge body (1) is a tubular hollow structure, and a discharge port (11) is provided on the side wall of the discharge body (1), the discharge port (11) is connected to the internal cavity of the discharge body (1), and the discharge port (11) is used to discharge liquid; The suction body (2) is a tubular cavity structure, the suction body (2) comprising a suction body (22) and a rear cover plate (23); a suction cavity (221) is provided inside the suction body (22), the suction cavity (221) is communicated with the internal cavity of the discharge body (1), and one end of the suction body (22) is in contact with the discharge body (1); the rear cover plate (23) is provided on a side of the suction body (22) away from the discharge body (1), the rear cover plate (23) is in contact with the suction body (22), and a plurality of bolt (241) through holes for passing the bolts (241) are also provided on the rear cover plate (23); A plurality of fasteners (24), wherein the plurality of fasteners (24) are arranged at intervals along the circumference of the central axis of the suction body (22), one end of the fastener (24) is arranged on the discharge body (1), and the other end of the fastener (24) is passed through the rear cover plate (23) and connected to the rear cover plate (23).

2. The pump housing according to claim 1, characterized in that: The fastener (24) comprises: A bolt (241), one end of which is connected to the discharge body, a rod of the bolt is inserted into the suction chamber and the other end of the bolt (241) is inserted into the rear cover plate (23); A nut (242) is threadedly connected to the bolt (241), and the nut (242) is arranged on a side of the rear cover plate (23) away from the suction body (22).

3. The pump housing according to claim 2, characterized in that: The fastener (24) also includes a spring washer, which is arranged between the nut (242) and the rear cover plate (23).

4. The pump housing according to claim 3, characterized in that An annular boss (12) is provided on the end surface of the discharge body (1) close to the suction body (22), and the annular boss (12) is used to support the suction body (22).

5. A three-screw pump with adjustable inlet and outlet angles, characterized in that: A pump casing according to any one of claims 1 to 4.

6. The three-screw pump with adjustable inlet and outlet angles as claimed in claim 5, characterized in that: The discharge body (1) and the suction body (2) form a pump chamber, and the inlet and outlet angle adjustable three-screw pump also includes: A connecting disk (3) is arranged at the other end of the discharge body (1), the connecting disk (3) is coaxially arranged with the discharge body (1), and a second through hole is arranged in the middle of the connecting disk (3); A pump sleeve (4) is embedded in the pump cavity, one end of the pump sleeve (4) is connected to the inner wall of the discharge body (1), and the other end of the pump sleeve (4) is arranged in the suction body (2); A bearing box (5) is arranged on the connecting plate (3), and the bearing box (5) is provided with a third through hole; The active screw rod (6) is sequentially inserted into the bearing box (5), the connecting plate (3) and the pump sleeve (4), one end of the active screw rod (6) is exposed on the top surface of the bearing box (5), and the other end of the active screw rod (6) is spaced apart from the rear cover plate (23).

7. The three-screw pump with adjustable inlet and outlet angles as claimed in claim 6, characterized in that: The pump sleeve (4) comprises: The first connecting portion (41) is a disc-shaped structure, and the outer wall of the first connecting portion (41) is used to abut against the inner wall of the discharge body (1); A second connecting portion (42), one end of which is connected to the first connecting portion (41); the outer diameter of the second connecting portion (42) is smaller than the outer diameter of the first connecting portion (41); the second connecting portion (42) is two arc-shaped plates, and the two arc-shaped plates are arranged at intervals along the circumference of the first connecting portion (41); a third connecting portion (43) connected to the other end of the second connecting portion (42), wherein the outer diameter of the third connecting portion (43) is smaller than the outer diameter of the second connecting portion (42); The third connecting portion (43) is provided with a through hole (44), the through hole (44) is a large hole (441) and two small holes (442), the two small holes (442) are symmetrically arranged on both sides of the large hole (441), and the two small holes (442) are connected to the large hole (441).

8. The three-screw pump with adjustable inlet and outlet angles as claimed in claim 7, characterized in that: The pump sleeve (4) further comprises: two reinforcing ribs (45), the two reinforcing ribs (45) being symmetrically fixedly arranged between the first connecting portion (41) and the third connecting portion (43), and the reinforcing ribs (45) being arranged between the two arc-shaped plates, and the two ends of the reinforcing ribs (45) being respectively connected to the first connecting portion (41) and the third connecting portion (43); The embedding portion (46) is an annular structure, the embedding portion (46) is arranged around the third connecting portion (43), the embedding portion (46) is provided with an annular groove (461), and the embedding portion (46) is connected to the annular inner wall of the annular boss (12).

9. The three-screw pump with adjustable inlet and outlet angles as claimed in claim 8, characterized in that: The reinforcing rib (45) passes through the fitting portion (46) and is connected to the outer side wall of the third connecting portion (43).

10. The three-screw pump with adjustable inlet and outlet angles as claimed in claim 5, characterized in that: The bearing box (5) is connected to the connection plate (3) via a first bolt connection structure, and the connection plate (3) is connected to the discharge body (1) via a second bolt connection structure.

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