Rubber asphalt pump

Abstract

The utility model relates to a rubber asphalt pump which comprises a screw rod, a pump shell and a rotary drum set. And a feeding pipe and a discharging pipe are arranged on the pump shell. The rotary drum set comprises a movable rotary drum and a fixed rotary drum. A first end plate is formed at one end of the movable rotating drum, a second end plate is formed at one end of the fixed rotating drum, and a plurality of strip-shaped groove holes distributed at intervals in the circumferential direction are formed in the side walls of the two rotating drums. The open end of the movable rotary drum extends into the fixed rotary drum, and a gap is formed between the opposite circumferential faces of the movable rotary drum. And the end plate I is matched with the screw rod, so that the movable rotating drum and the screw rod can rotate synchronously. The second end plate is assembled at one end of the pump shell and enables the fixed rotating cylinder to be opposite to the feeding pipe. And a plurality of through holes capable of communicating the movable rotary drum with the pump shell are formed in the end plate 1. And a stirring paddle capable of synchronously rotating with the screw rod is arranged on the screw rod, so that materials flow into the movable rotating drum from the outside of the fixed rotating drum and can be conveyed into the pump shell. In the rubber asphalt conveying process, the rubber asphalt can be sheared and mixed at the same time, and the development time of the rubber asphalt can be shortened.

Description

Technical Field

[0001] This utility model belongs to the technical field of asphalt raw material conveying devices, and specifically relates to a rubber asphalt pump. Background Technology

[0002] A rubber asphalt pump is a device used to transport rubber asphalt, and it mainly comes in two forms: gear pumps and screw pumps. The working principle of a screw pump is that the rotation of the screw creates a spiral space within the pump casing. Driven by the screw, the rubber asphalt gradually moves along this spiral space from the inlet pipe at the suction end to the outlet pipe at the discharge end. The small gap between the screw and the pump casing effectively seals the rubber asphalt, achieving stable transport. However, existing rubber asphalt pumps only have a transport function and cannot shear and / or disperse the rubber asphalt during transport. Therefore, the rubber asphalt needs to mature in the tank for a relatively long time, consuming a large amount of heat energy, which can easily lead to relatively severe aging of the rubber asphalt. Utility Model Content

[0003] The present invention aims to provide a rubber asphalt pump that can simultaneously shear and mix rubber asphalt during the transportation process, thereby helping to shorten the development time of rubber asphalt.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a rubber asphalt pump, including a motor unit, a screw, a pump casing and a rotating drum assembly.

[0005] One end of the screw is matched with the motor unit, enabling the screw to rotate under the drive of the motor unit. Inlet and outlet pipes for the rubber asphalt material are respectively provided on both ends of the pump casing. Part of the screw extends into the pump casing, allowing it to transport the rubber asphalt material input from the inlet pipe towards the outlet pipe during its rotation, and then output it to associated external equipment via the outlet pipe.

[0006] The rotating drum assembly includes a moving drum and a stationary drum. An end plate is formed at one end of the moving drum, and an end plate is formed at one end of the stationary drum. The moving drum is matched with and can rotate synchronously with the screw. Specifically, a central hole is formed on end plate one, and a keyway structure corresponding to the key on the screw is formed in the central hole. The stationary drum is fixed to one end of the pump housing, with its sidewall facing the inner port of the feed pipe, and a radial distance is formed between the outer circumferential surface of the stationary drum and the inner wall surface of the pump housing. Specifically, end plate two is fixed at the port of the pump housing and is fixedly connected to an end seat that supports the end of the pump housing.

[0007] The open end of the moving rotating cylinder extends into the stationary rotating cylinder, forming a radial gap between the opposing circumferential surfaces of the two rotating cylinders. Multiple circumferentially spaced, alternating strip-shaped slots are provided on the side walls of both the moving and stationary rotating cylinders. Multiple through holes connecting the cylinder cavity of the moving rotating cylinder to the pump cavity of the pump casing are formed on the surface of end plate one.

[0008] An agitator is mounted on a section of the screw that is positioned within the cavity of the rotating drum. The agitator rotates synchronously with the screw, causing material to flow from the outside of the stationary drum into the rotating drum and through the through-hole into the pump cavity of the pump casing.

[0009] Optionally, the circumferential width of the strip-shaped slot on the side wall of the moving rotating cylinder is greater than the circumferential width of the strip-shaped slot on the side wall of the stationary rotating cylinder. Preferably, the circumferential width of the strip-shaped slot on the side wall of the moving rotating cylinder is 1.2 to 3 times the circumferential width of the strip-shaped slot on the side wall of the stationary rotating cylinder.

[0010] Optionally, the outer diameter of end plate one is larger than the outer diameter of the stationary rotating cylinder. An annular radial flange is formed at the end port on the pump casing opposite to the rotating cylinder, and an annular groove is formed on the inner circumferential surface of this radial flange. The circumferential edge of end plate one is inserted into the annular groove.

[0011] Optionally, the inner diameter of the feed pipe is smaller than the axial length of the body of the rotating cylinder, and the side wall of the rotating cylinder is axially centered opposite the inner port of the feed pipe.

[0012] Optionally, the system also includes a dispersion disc assembly. The dispersion disc assembly comprises multiple disc bodies (Dials I and II), with the number of disc bodies I and disc bodies II being the same. The outer diameter of disc body I is the same as the inner diameter of the pump casing and is larger than the outer diameter of disc body II.

[0013] Disc 1 and Disc 2 are alternately distributed axially, with Disc 1 at one end facing End Plate 1, and Disc 2 at the other end facing the inner port of the discharge pipe. That is, at both ends of the pump chamber of the pump casing, one Disc 1 is set at the end near the rotating drum assembly, directly facing End Plate 1, and one Disc 2 is set at the other end, directly facing the sealing plate at the end of the pump casing. Other Disc 1 and Disc 2 are distributed alternately between Disc 1 and Disc 2.

[0014] Each disc body has a through hole at its axial center for the screw to pass through, and a radial distance is formed between the screw and the opposite circumferential surfaces of the through hole. This fixes the first disc body inside the pump casing and allows the second disc body to rotate synchronously with the screw.

[0015] Multiple rings of pillars are distributed on both end faces of disk one. Multiple rings of pillars are distributed on both end faces of disk two. The multiple rings of pillars one arranged on the opposite end faces of disk one and disk two extend between the two adjacent rings of pillars two.

[0016] Optionally, an axial gap is formed between the end face of the first column and the end face of the second disk.

[0017] Optionally, column one and / or column two are cylinders.

[0018] Optionally, multiple discs are connected in series as a whole via multiple connecting rods. Multiple slots are formed alternately in the circumferential direction on the sidewalls of each disc. Multiple radial grooves are formed on the sidewalls of the connecting rods, corresponding to and matching the slots, and these radial grooves are alternately distributed in the axial direction. After the slots and radial grooves are matched, the connecting rods can keep the axial positions of the individual discs relatively fixed. The connecting rods are fixedly matched to the pump housing.

[0019] Optionally, an annular groove is formed on the end face of the end plate facing into the pump housing. The end of the connecting rod away from the rotary drum assembly is fixedly connected to the end of the pump housing. The other end of the connecting rod extends into the groove on the end plate.

[0020] The beneficial effects of this invention are as follows: This invention can simultaneously perform shearing, mixing, and / or dispersion treatments on rubber asphalt during the transportation process, which helps shorten the development time of the rubber asphalt, saves energy (because rubber asphalt needs to develop in a high-temperature environment of 185 to 190 degrees Celsius), and reduces the degree of aging of the rubber asphalt. Shearing the rubber asphalt during transportation improves the uniformity of dispersion and mixing, and helps to increase the fineness of the rubber asphalt. Attached Figure Description

[0021] Figures 1 to 4 This is a three-dimensional structural diagram of a rubber asphalt pump.

[0022] Figure 5 This is a schematic diagram of the assembly structure inside the pump casing (without the rotating cylinder assembled).

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the screw.

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the rotating drum assembly.

[0025] Figure 8 This is a schematic diagram of the connection structure between the rotary drum assembly and the dispersion disc assembly and the screw at the pump casing.

[0026] Figure 9 This is a schematic diagram of the main structure of a rubber asphalt pump.

[0027] Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure at point AA.

[0028] In the diagram: 10 Motor unit; 20 Screw; 21 Coupling; 22 Agitator; 30 Pump casing; 31 Inlet pipe; 32 Discharge pipe; 40 Connecting frame; 50 End seat; 60 Rotary drum assembly; 61 Moving rotary drum; 611 End plate one; 6111 Shaft hole; 6112 Through hole; 612 Strip slot hole one; 62 Fixed rotary drum; 621 End plate two; 622 Strip slot hole two; 70 Dispersing disc assembly; 71 Disc body one; 711 Column one; 712 Through hole section; 713 Buckle; 72 Disc body two; 721 Column two; 73 Connecting rod. Detailed Implementation

[0029] The structures, proportions, and sizes shown in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0030] like Figures 1 to 10 The rubber asphalt pump shown includes a motor unit 10, a screw 20, a pump housing 30, a connecting frame 40, an end seat 50, a rotary drum assembly 60, and a dispersion disc assembly 70.

[0031] The motor unit 10 includes a matching drive motor and a reducer. The connecting frame 40 is fixedly disposed between the pump housing 30 and the reducer, and a coupling 21 is provided in the connecting frame 40 to mate the output shaft end of the reducer with the input end of the screw 20, enabling the drive motor to drive the screw 20 to rotate. The end seat 50 is fixedly connected to the other end of the pump chamber 30, and the screw 20 passes through the pump chamber / shell cavity of the pump housing 30 and extends to the end seat 50. Therefore, both ends of the screw 20 are supported between the connecting frame 40 and the end seat 50. On the pump housing 30, an inlet pipe 31 is provided on the side near the end seat 50 for inputting rubber asphalt material (hereinafter referred to as material) into the pump chamber of the pump housing 30, and a discharge pipe 32 is provided on the side near the connecting frame 40 for outputting the material from the pump housing 30 to the outside. The aforementioned technical content can be implemented with reference to existing technologies and is not the focus of the technical innovation of this application, so it will not be elaborated further.

[0032] The rotating drum assembly 60 includes / contains a movable rotating drum 61 and a fixed rotating drum 62. An end plate 611 is formed at one end of the movable rotating drum 61, and an end plate 621 is formed at one end of the fixed rotating drum 62. The open ends of the movable rotating drum 61 and the fixed rotating drum 62 are opposite each other, and the open end of the movable rotating drum 61 extends into the cavity of the fixed rotating drum 62. The end face of the open end of the movable rotating drum 61 can contact or form a gap with the inner bottom surface of the end plate 621. The end plate 611 is positioned outside the cavity of the fixed rotating drum 62. A radial distance is formed between the outer circumferential surface of the movable rotating drum 61 and the inner circumferential surface of the fixed rotating drum 62, forming an inner channel for material flow in the circumferential direction.

[0033] The outer diameter of the end plate 611 can be larger than the outer diameter of the rotating cylinder 62, in which case the end plate 611 is placed outside the rotating cylinder 62. Simultaneously, an annular radial flange can be configured at the port of the pump housing 30, and an annular groove is formed on the inner circumferential surface of the radial flange. The annular edge of the end plate 611 is placed in the annular groove, thereby sealing the port of the pump housing 30. A sealing ring structure is provided between the opposite surfaces of the end plate 611 and the annular groove. At this time, material can only flow through the multiple through holes 6112 provided on the end plate 611 into the pump chamber of the pump housing 30 on the side near the connecting frame 40.

[0034] The rotating drum 61 is matched with the screw 20 and can rotate synchronously with the screw 20. Specifically, a central hole 6111 is formed at the center of the end plate 611 of the rotating drum 61, and a keyway structure is formed on the central hole 6111. The screw 20 passes through the central hole 6111 and extends into the cavity of the rotating drum 61, and the screw 20 matches the keyway structure provided on the central hole 6111, so that the rotating drum 61 can be driven to rotate by the end plate 611.

[0035] The fixed-rotation cylinder 62 is fixed relative to one end of the pump housing 30 near the end seat 50, and the side wall of the fixed-rotation cylinder 62 is opposite (radially) to the inner port of the feed pipe 31. See [reference needed] Figure 2 , Figure 5A radial gap is formed between the outer circumferential surface of the stationary rotating drum 60 and the inner wall of the pump chamber of the pump housing 30, forming an outer channel for material flow in the circumferential direction. Specifically, a shaft hole is formed at the center of the second end plate 621 of the moving rotating drum 62 for the screw 20 to pass through, allowing the screw 20 to extend through the second end plate 621 to the end seat 50 and match the shaft hole structure on the end seat 50. The second end plate 621 can seal the port of the pump housing 30 and be fixedly connected to the end seat 50. A groove can be formed on the end face of the end seat 50 facing the rotating drum assembly 60, allowing the second end plate 621 to extend into the groove and be fixedly connected to the end seat 50.

[0036] The axial directions of the moving drum 61, the stationary drum 62, the screw 20, and the pump chamber of the pump housing 30 are aligned. Multiple alternating circumferentially distributed strip-shaped slots 612 are formed on the side wall of the moving drum 61. These slots extend axially along the moving drum 61. Multiple alternating circumferentially distributed strip-shaped slots 622 are formed on the side wall of the stationary drum 62. These slots extend axially along the stationary drum 62. The circumferential width of the first strip-shaped slot 612 is greater than the circumferential width of the second strip-shaped slot 622, preferably 1.2 to 3 times, and more preferably 1.5 to 2 times, the former being 1.2 to 3 times the latter.

[0037] Multiple through holes 6112 are formed on the surface of the end plate 611, which connect the cylinder cavity of the rotating cylinder 61 with the pump cavity of the pump housing 30. The through holes 6112 are distributed around the axial hole 6111.

[0038] An agitator 22 (or conveyor) is disposed on a section of the screw 20 that is located inside the cavity of the rotating drum 61. The agitator 22 can rotate synchronously with the screw 20, and can cause the material to flow from the outside of the stationary rotating drum 62 into the rotating drum 61 and be conveyed to the pump cavity of the pump casing 30 through the through hole 6112.

[0039] When the agitator 22 rotates, its four blades push the material axially from the end of the pump housing 30 near the end seat 50 towards the end of the pump housing 30 near the connecting frame 40. This creates a negative pressure in the cavity of the rotating drum 61, continuously drawing material distributed near the outer circumference of the rotating drum 61 into its cavity. Simultaneously, the rapid rotation of the rotating drum 61 creates a negative pressure between its circumference and that of the stationary rotating drum 62, drawing material distributed around the stationary rotating drum 62 into the space between the two rotating drums. During transport, the material undergoes shearing between the two drums, further refining it; simultaneously, the material experiences two distribution flow processes in the circumferential direction, contributing to improved uniformity of material mixing. Therefore, the above technical solution can shear and mix the material during transport, promoting material refinement and improving homogeneity, thus helping to shorten the development time of rubber asphalt.

[0040] like Figures 3 to 5 , Figure 8 , Figure 10 As shown, the dispersing disc assembly 70 includes three disc bodies 71 and three disc bodies 72. The outer diameter of the disc body 71 is the same as the inner diameter of the pump housing 30 and is larger than the outer diameter of the disc body 72, thereby forming a radial gap between the outer circumferential surface of the disc body 72 and the inner circumferential surface of the pump housing 30, forming an annular channel for material flow.

[0041] The first disc 71 and the second disc 72 are alternately distributed in the axial direction, with the first disc 71 located at one end directly facing the end plate 611, and the second disc 72 located at the other end facing the inner port of the discharge pipe 32. (See also...) Figure 3 , 4 That is, a disc body 71 (which may be called end disc body 1) is set near the end plate 611, and a disc body 72 (which may be called end disc body 2) is set near the end of the pump housing 30 near the connecting frame 40. Then, the remaining two disc bodies 71 and the remaining two disc bodies 72 are alternately arranged between the aforementioned end disc body 1 and the aforementioned end disc body 2. See [reference needed]. Figure 5 , Figure 8 , Figure 10 .

[0042] Each of the disc bodies 71 has a through hole 712 formed at its axial center for the screw 20 to pass through, and a radial distance is formed between the screw 20 and the opposite circumferential surfaces of the through hole 712, thus forming an axial flow channel for material to flow between two adjacent disc bodies 71, so that the material can flow in the pump chamber of the pump housing 30 to the inner port of the discharge pipe 32.

[0043] The first disc 71 is fixed inside the pump housing 30. The second disc 72 can rotate synchronously with the screw 20.

[0044] Multiple rings of cylindrical columns 711 are distributed on both end faces of the first disc 71. Multiple rings of cylindrical columns 721 are distributed on both end faces of the second disc 72. Both cylindrical columns 711 and 721 are cylindrical. The multiple rings of cylindrical columns 711 on the opposite end faces of the first disc 71 and the second disc 72 can extend between adjacent rings of cylindrical columns 721. It is known that the radial distance between the multiple rings of cylindrical columns 721 on the end face of the second disc 72 (i.e., the radial spacing between each adjacent ring of cylindrical columns 721) is greater than the outer diameter of the cylindrical column 711. Therefore, when the second disc 72 rotates relative to the first disc 71, the cylindrical columns 711 and 721 will not collide, and can form multiple annular channels, which helps to improve the fineness of material dispersion. To improve the smoothness of material flow, an axial gap is formed between the end face of the first column 711 and the end face of the second disc 72, and an axial gap is formed between the end face of the second column 721 and the end face of the first disc 71.

[0045] Three discs 71 are connected in series by four connecting rods 73. Each disc 71 has four slots 713 arranged alternately in the circumferential direction on its sidewall. Each connecting rod 73 has multiple radial grooves on its sidewall that correspond to and match the slots 713, and these radial grooves are arranged alternately in the axial direction. After the slots 713 match the radial grooves, the end faces of the radial grooves can contact the end faces of the discs 71 (similar to discs 71 being inserted between two shoulders), thus the connecting rods 73 can keep the axial positions of the discs 71 relatively fixed.

[0046] One end of the connecting rod 73, away from the rotary drum assembly 60, is fixedly connected to the end of the pump housing 30 (the inner flange). The other end face of the connecting rod 73 is formed as an outwardly protruding spherical surface and contacts the end face of the end plate 611. Alternatively,

[0047] An annular groove is formed on one end face of the end plate 611 facing the pump housing 30, so that the other end of the connecting rod 73 extends into the groove formed on the end plate 611.

[0048] When the material flows axially within the pump casing 30, it is agitated by the first column 711 and the second column 721, and dispersed on the disk surface and thrown towards the radial outer edge. Then, during the radial deflection process (i.e., converging towards the through-hole 712), it aggregates. This repeated dispersion and aggregation process enhances the mixing and mass transfer effect within the material. Therefore, by setting up the dispersion disk assembly 70, the material can undergo multiple dispersion and aggregation processes cyclically in both the radial and circumferential directions, significantly improving the uniformity of mixing and mass transfer, and helping to further shorten the development time.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit it. Many aspects of this utility model can be improved without departing from the overall concept. Those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A rubber asphalt pump, comprising a motor unit (10), a screw (20), and a pump housing (30); an inlet pipe (31) and a discharge pipe (32) are respectively provided on both ends of the pump housing (30); a portion of the screw (20) extends into the pump housing (30); characterized in that: It also includes a drum assembly (60) containing a moving drum (61) and a stationary drum (62). One end of the moving rotating cylinder (61) is formed with an end plate 1 (611), and one end of the fixed rotating cylinder (62) is formed with an end plate 2 (621). Multiple strip-shaped slots are provided on the side walls of the two rotating cylinders, which are distributed alternately in a circumferential direction. The open end of the moving rotating cylinder (61) extends into the fixed rotating cylinder (62) and a gap is formed between their opposing circumferential surfaces; end plate one (611) matches the screw (20) so that the moving rotating cylinder (61) can rotate synchronously with the screw (20); end plate two (621) is fixedly assembled to one end of the pump housing (30) and the side wall of the fixed rotating cylinder (62) is opposite to the inner port of the feed pipe (31); a radial gap is formed between the outer circumferential surface of the fixed rotating cylinder (62) and the inner wall surface of the pump housing (30); Multiple through holes (6112) are formed on the end plate (611) to connect the rotating cylinder (61) and the pump casing (30). An agitator (22) is provided on a section of the screw (20) that is placed inside the rotating drum (61); the agitator (22) can rotate synchronously with the screw (20) to cause the material to flow from the periphery of the stationary rotating drum (62) into the rotating drum (61) and be transported to the pump chamber of the pump housing (30) through the through hole (6112).

2. The rubber asphalt pump according to claim 1, characterized in that: The circumferential width of the strip-shaped slot on the side wall of the moving rotating cylinder (61) is greater than the circumferential width of the strip-shaped slot on the side wall of the stationary rotating cylinder (62).

3. The rubber asphalt pump according to claim 2, characterized in that: The circumferential width of the strip-shaped slot on the side wall of the moving rotating cylinder (61) is 1.2 to 3 times the circumferential width of the strip-shaped slot on the side wall of the stationary rotating cylinder (62).

4. The rubber asphalt pump according to claim 1, characterized in that: The outer diameter of end plate 1 (611) is larger than the outer diameter of the fixed rotating cylinder (62); a radial flange in the shape of an annular shape is formed at one end port opposite to the moving rotating cylinder (61) of the pump housing (30), and an annular groove is formed on the inner circumferential surface of the radial flange; the circumferential edge of end plate 1 (611) is inserted into the annular groove.

5. The rubber asphalt pump according to claim 1, characterized in that: The inner diameter of the feed tube (31) is smaller than the axial length of the body of the rotating cylinder (62), and the side wall of the rotating cylinder (62) is axially centered opposite the inner port of the feed tube (31).

6. The rubber asphalt pump according to any one of claims 1 to 5, characterized in that: It also includes distributed disk groups (70); The distributed disk group (70) includes multiple disk bodies one (71) and multiple disk bodies two (72) of the same number; The outer diameter of disc body one (71) is the same as the inner diameter of pump casing (30), and is larger than the outer diameter of disc body two (72); Disc body one (71) and disc body two (72) are alternately distributed in the axial direction, and disc body one (71) at one end is opposite to end plate one (611), and disc body two (72) at the other end is opposite to the inner port of the discharge pipe (32). Each of the first disc (71) has a through hole (712) at its axial center for the screw (20) to pass through, and a radial distance is formed between the screw (20) and the opposite circumferential surfaces of the through hole (712); the first disc (71) is fixed inside the pump housing (30); the second disc (72) can rotate synchronously with the screw (20); Multiple rings of cylinders (711) are distributed on both end faces of disk one (71); multiple rings of cylinders (721) are distributed on both end faces of disk two (72); the multiple rings of cylinders (711) distributed on the opposite end faces of disk one (71) and disk two (72) can extend to the two adjacent rings of cylinders (721).

7. The rubber asphalt pump according to claim 6, characterized in that: An axial gap is formed between the end face of column one (711) and the end face of disk two (72); an axial gap is formed between the end face of column two (721) and the end face of disk one (71).

8. The rubber asphalt pump according to claim 6, characterized in that: Column 1 (711) and / or Column 2 (721) are cylinders.

9. The rubber asphalt pump according to claim 6, characterized in that: Multiple discs (71) are connected in series as a whole by multiple connecting rods (73); multiple slots (713) are formed on the side wall of each disc (71) in a circumferential direction; multiple radial grooves are formed on the side wall of the connecting rod (73) to match the slots (713), and the multiple radial grooves are distributed alternately in the axial direction; after the slots (713) match the radial grooves, the connecting rod (73) can keep the axial position of each disc (71) relatively fixed; the connecting rod (73) is fixedly matched with the pump housing (30).

10. The rubber asphalt pump according to claim 9, characterized in that: An annular groove is formed on one end face of the end plate (611) facing the pump housing (30); one end of the connecting rod (73) away from the rotating drum assembly (60) is fixedly connected to the end of the pump housing (30), and the other end extends into the groove.

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