A pump station pump machine base concentricity measuring device

Abstract

The application discloses a pump station pump machine base concentricity measuring device and relates to the field of auxiliary equipment for water conservancy construction. The application discloses a pump station pump machine base concentricity measuring device and relates to the field of auxiliary equipment for water conservancy construction. The application discloses a pump station pump machine base concentricity measuring device and relates to the field of auxiliary equipment for water conservancy construction.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment for water conservancy engineering construction, and in particular to a device for measuring the concentricity of pump station bases. Background Technology

[0002] A pumping station is a device and engineering project that provides hydraulic and pneumatic power with a certain pressure and flow rate. With the widespread construction of water conservancy projects in my country, pumping stations, as an important component of water conservancy hubs, play a crucial role in the allocation of water resources.

[0003] In the relevant technology, Chinese utility model patent with publication number CN206667365U discloses a well-type underground pump station structure, including an outer river-side water intake channel consisting of a bottom plate of the water intake channel, a top plate of the outer river-side water intake channel, and side piers; an inner river-side water intake channel consisting of a bottom plate of the water intake channel, a top plate of the inner river-side water intake channel, and side piers; and a submersible pump unit consisting of a bell mouth, a guide cap, a pump shaft, a hub, blades, a guide vane body, guide vanes, a submersible motor, a lifting ring, and a pump body shell; a No. 1 support bottom plate is provided above the top plate of the inner river-side water intake channel, and the outer river-side water intake channel... A second support base plate is provided above the top slab of the channel. A well is provided between the first and second support base plates and between the top slabs of the outer river inlet channel and the inner river inlet channel. The submersible pump unit is coupled to the pump well and is fixedly installed inside the well through the pump base. A first support wall and a second support wall are provided above the first support base plate. A third support wall and a fourth support wall are provided above the second support base plate. A valve well is formed between the third support wall and the first support wall. A reversing valve is provided in the valve well. The reversing valve is connected to the top of the submersible pump unit. A valve well cover plate is provided on the top of the valve well.

[0004] Regarding the aforementioned technologies, the pump base is fixedly installed on the outer top of the pump well, and the submersible pump unit is inserted into the pump well. The pump base and the submersible pump unit are connected by bolts. To reduce the possibility of the submersible pump unit being squeezed against the inner wall of the pump well after being fixed to the pump base, the concentricity of the inner ring of the pump base with the inner wall of the pump well must be ensured before inserting the submersible pump unit into the pump well, thereby improving the accuracy of the submersible pump unit's installation position. Currently, in engineering projects, when calibrating the position of the pump base, construction personnel usually use handheld testing equipment to measure and adjust the pump base multiple times, which increases the workload of construction personnel and reduces the installation efficiency of the submersible pump unit. Summary of the Invention

[0005] In order to facilitate the concentricity correction of the inner ring of the pump base and the pump well and improve the installation efficiency of the submersible pump unit, this application provides a pump station pump base concentricity measuring device.

[0006] The concentricity measuring device for pump station base provided in this application adopts the following technical solution:

[0007] A device for measuring the concentricity of a pump station base includes a lower positioning ring concentrically fixed to the inner wall of the pump well, an upper positioning ring coaxially arranged with the lower positioning ring, and connecting rods fixed to the upper and lower positioning rings respectively. The upper positioning ring is provided with a concentric positioning mechanism, and there are no fewer than three sets of concentric positioning mechanisms distributed along the circumference of the upper positioning ring. Each concentric positioning mechanism includes a transverse rod slidably disposed on the upper positioning ring and a thrust assembly that prevents the transverse rod from sliding inward to the inner side of the upper positioning ring. One end of the transverse rod located outside the upper positioning ring is fixedly connected to an abutting block for abutting against the inner ring of the pump base. The transverse rod is provided with a scale.

[0008] By adopting the above technical solution, the lower positioning ring is concentrically fixed to the inner wall of the pump well, and the upper positioning ring is coaxially set with the lower positioning ring. There are no less than three sets of concentric positioning mechanisms on the upper positioning ring and distributed along the circumference of the upper positioning ring. After the lower positioning ring is fixed, the pump base is placed above the pump well, and the horizontal rod is pushed to the inner side of the upper positioning ring so that the contact block is located inside the pump base. Under the thrust of the thrust assembly, the contact block is pressed tightly against the inner circumferential wall of the inner ring of the pump base. Since there are scales on the horizontal rods, when the axis of the inner ring of the pump base is offset from the axis of the pump well, the readings on each horizontal rod will be inconsistent. The construction personnel only need to adjust the pump base until the scale readings formed by each horizontal rod and the outer circumferential surface of the upper positioning ring are consistent to complete the concentricity correction of the inner ring of the pump base and the pump well. The construction personnel do not need to measure repeatedly, thereby improving the installation efficiency of the submersible pump unit.

[0009] Preferably, the lower positioning ring is provided with a concentric fixing mechanism, and there are no fewer than three sets of the concentric fixing mechanism distributed along the circumference of the lower positioning ring. A connecting hole is provided on the inner circumferential wall of the lower positioning ring. The concentric fixing mechanism includes a threaded rod rotatably disposed on the inner wall of the connecting hole. A first limiting member is provided between the threaded rod and the lower positioning ring to prevent the axial movement of the threaded rod. A first annular groove is provided on the outer circumferential wall of the lower positioning ring, which coincides with the axis of the connecting hole. An abutment tube is slidably disposed in the first annular groove to abut against the inner wall of the pump well. A second limiting member is provided between the abutment tube and the lower positioning ring to prevent the rotation of the abutment tube. The abutment tube is threadedly connected to the threaded rod. The concentric fixing mechanism also includes a synchronous drive assembly for synchronously driving the rotation of the threaded rod.

[0010] By adopting the above technical solution, the threaded rod is rotatably set in the connecting hole, and the sleeve is slidably set in the first annular groove. When the synchronous drive assembly synchronously drives multiple threaded rods to rotate, the threaded rods can be driven to slide away from the threaded rods by the obstruction of the first and second limiting parts until each abutting tube is tightly pressed against the inner wall of the pump well, so that the lower positioning ring can be stably fixed to the inner side of the pump well.

[0011] Preferably, the synchronous drive assembly includes a fixed frame fixed to the lower positioning ring, a vertical shaft rotatably mounted on the fixed frame, a drive bevel gear coaxially fixed to the vertical shaft, and a driven bevel gear coaxially fixed to the end of the threaded rod away from the contact tube. The axis of the vertical shaft coincides with the axis of the lower positioning ring, and all driven bevel gears mesh with the drive bevel gear.

[0012] By adopting the above technical solution, the fixing frame is fixedly connected to the lower positioning ring, and the vertical shaft is rotatably set on the fixing frame. The axis of the vertical shaft coincides with the axis of the lower positioning ring. The driving bevel gear is fixed on the vertical shaft, and the driven bevel gear is coaxially fixed to the end of the threaded rod away from the contact tube. All driven bevel gears mesh with the driving bevel gear. When the construction personnel rotate the vertical shaft, the driving bevel gear can simultaneously drive multiple driven bevel gears to rotate, so that each contact tube can synchronously approach the inner circumferential wall of the pump well until each contact tube is tightly pressed against the inner circumferential wall of the pump well, thereby enabling the lower positioning ring to be stably and concentrically fixed to the inner side of the pump well.

[0013] Preferably, a second annular groove is formed on the inner wall of the connecting hole, the first limiting member is fixed on the threaded rod, and the first limiting member is rotatably disposed in the second annular groove.

[0014] By adopting the above technical solution, the second annular groove is opened on the inner wall of the connecting hole, and the first limiting member is fixed on the threaded rod. When the threaded rod rotates, the first limiting member is rotatably set in the second annular groove, thereby preventing the threaded rod from moving laterally relative to the lower positioning ring.

[0015] Preferably, a limiting groove is formed on the inner wall of the first annular groove, the length direction of the limiting groove is parallel to the length direction of the threaded rod, the second limiting member is fixed on the outer peripheral wall of the contact tube, and the second limiting member is slidably disposed in the limiting groove.

[0016] By adopting the above technical solution, the second limiting member is slidably disposed in the limiting groove, thereby preventing the contact tube from rotating relative to the lower positioning ring.

[0017] Preferably, a sliding hole is provided on the inner wall of the upper positioning ring, the transverse rod is slidably disposed in the sliding hole, a retaining groove is provided on the inner wall of the sliding hole, the length direction of the retaining groove is parallel to the axial direction of the transverse rod, and a stop block is fixedly connected to the transverse rod, the stop block is slidably disposed in the retaining groove.

[0018] By adopting the above technical solution, the transverse rod is slidably set in the sliding hole, the stop block is fixed on the transverse rod, and the stop block is slidably set in the stop groove, thereby preventing the transverse rod from rotating relative to the upper positioning ring, so that the transverse rod can slide more stably on the upper positioning rod.

[0019] Preferably, the thrust assembly is disposed within the retaining groove, and the thrust assembly is a thrust spring. One end of the thrust spring abuts against the side of the retaining block away from the abutting block, and the other end of the thrust spring abuts against the side wall of the retaining groove away from the abutting block.

[0020] By adopting the above technical solution, one end of the thrust spring abuts against the side of the stop block away from the abutting block, and the other end of the thrust spring abuts against the side wall of the stop groove away from the abutting block. Under the elastic force of the thrust spring, the abutting block can be tightly pressed against the inner peripheral wall of the pump well base.

[0021] Preferably, an overlapping mechanism is fixedly connected to the lower positioning ring. There are no fewer than two sets of overlapping mechanisms on the lower positioning ring and they are distributed along the circumference of the lower positioning ring. The overlapping mechanism includes a vertical plate slidably disposed on the lower positioning ring and a horizontal plate for abutting against the top edge of the pump well. The horizontal plate is fixedly connected to the vertical plate.

[0022] By adopting the above technical solution, the vertical plate is slidably set on the lower positioning ring, and the horizontal plate is fixedly connected to the vertical plate. When the measuring device is used, the vertical plate is slid away from the axis of the lower positioning ring, so that the bottom surface of the horizontal plate is placed on the top edge of the pump well, so that the lower positioning ring can be stably located in the pump well before the concentric fixing mechanism is fixed.

[0023] Preferably, a dovetail groove is provided on the top surface of the lower positioning ring, and a dovetail block is fixedly connected to the bottom surface of the vertical plate, the dovetail block being slidably disposed in the dovetail groove.

[0024] By adopting the above technical solution, the dovetail block slides within the dovetail groove, thereby enabling the vertical plate to be stably slidably mounted on the lower positioning ring.

[0025] Preferably, the abutment block has an inclined surface on its side away from the transverse rod, and the inclined surface is facing upward.

[0026] By adopting the above technical solution, the inclined surface is set on the side of the contact block away from the horizontal bar, with the inclined surface facing upwards. When the pump base is lowered and installed above the pump well, after the bottom edge of the inner ring of the pump base contacts the inclined surface, as the pump base continues to fall, the contact block can automatically slide towards the lower positioning ring under the action of the inclined surface until the pump base contacts the top edge of the pump well. At this time, the contact block contacts the inner wall of the inner ring of the pump base, which facilitates the positioning of the pump base.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The lower positioning ring is concentrically fixed to the inner wall of the pump well. The upper positioning ring is coaxially set with the lower positioning ring. There are no less than three sets of concentric positioning mechanisms on the upper positioning ring and distributed along the circumference of the upper positioning ring. After the lower positioning ring is fixed, the pump base is placed above the pump well, and the horizontal rod is pushed to the inner side of the upper positioning ring so that the contact block is located inside the pump base. Under the thrust of the thrust assembly, the contact block is pressed tightly against the inner circumferential wall of the inner ring of the pump base. Since there are scales on the horizontal rods, when the axis of the inner ring of the pump base is offset from the axis of the pump well, the readings on each horizontal rod will be inconsistent. The construction personnel only need to adjust the pump base until the scale readings formed by each horizontal rod and the outer circumferential surface of the upper positioning ring are consistent to complete the concentricity correction of the inner ring of the pump base and the pump well. The construction personnel do not need to measure repeatedly, thereby improving the installation efficiency of the submersible pump unit.

[0029] 2. The threaded rod is rotatably set in the connecting hole, and the sleeve is slidably set in the first annular groove. When the synchronous drive assembly synchronously drives multiple threaded rods to rotate, the threaded rod can be driven to slide away from the threaded rod by the obstruction of the first limiter and the second limiter until each abutment tube is tightly pressed against the inner wall of the pump well, so that the lower positioning ring can be stably fixed to the inner side of the pump well.

[0030] 3. The fixed frame is fixedly connected to the lower positioning ring, and the vertical shaft is rotatably set on the fixed frame. The axis of the vertical shaft coincides with the axis of the lower positioning ring. The driving bevel gear is fixed on the vertical shaft, and the driven bevel gear is coaxially fixed to the end of the threaded rod away from the contact tube. The driven bevel gears are all meshed with the driving bevel gear. When the construction personnel rotate the vertical shaft, the driving bevel gear can simultaneously drive multiple driven bevel gears to rotate, so that each contact tube can move towards the inner circumferential wall of the pump well synchronously until each contact tube is tightly pressed against the inner circumferential wall of the pump well, so that the lower positioning ring can be stably and concentrically fixed to the inner side of the pump well. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the measuring device installed inside the pump well in an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the overall structure of the measuring device in the embodiments of this application.

[0033] Figure 3 yes Figure 2 Sectional view along the middle AA.

[0034] Figure 4 yes Figure 3 A magnified view of a section at point B.

[0035] Figure 5 yes Figure 3 A magnified view of a section at point C.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Lower positioning ring; 11. Connecting hole; 111. Second annular groove; 12. First annular groove; 121. Limiting groove; 13. Dovetail groove; 2. Upper positioning ring; 21. Sliding hole; 211. Stop groove; 3. Connecting rod; 4. Concentric positioning mechanism; 41. Horizontal rod; 411. Scale; 42. Abutting block; 421. Inclined surface; 43. Stop block; 44. Thrust assembly; 441. Thrust spring; 5. Concentric fixing mechanism; 51. Threaded rod; 52. Abutting tube; 53. First limiting member; 54. Second limiting member; 55. Synchronous drive assembly; 551. Fixing frame; 552. Vertical shaft; 553. Drive bevel gear; 554. Driven bevel gear; 6. Overlapping mechanism; 61. Vertical plate; 62. Horizontal plate; 63. Dovetail block; 7. Pump base; 8. Pump well. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0039] This application discloses a device for measuring the concentricity of a pump station pump base. (Refer to...) Figure 1 and Figure 2 As shown, the measuring device includes a lower positioning ring 1, an upper positioning ring 2, a connecting rod 3, a concentric positioning mechanism 4, a concentric fixing mechanism 5, and an overlapping mechanism 6. The lower positioning ring 1 is horizontally positioned inside the pump well 8. The overlapping mechanism 6 is located on the top surface of the lower positioning ring 1 and is provided in at least two sets. In this embodiment, there are three sets of overlapping mechanisms 6, which are evenly distributed along the circumference of the lower positioning ring 1.

[0040] Reference Figure 2 and Figure 3As shown, the overlapping mechanism 6 includes a vertical plate 61, a horizontal plate 62, and a dovetail block 63. A dovetail groove 13 is formed on the top surface of the lower positioning ring 1, with the length direction of the dovetail groove 13 being the diameter direction of the lower positioning ring 1. The vertical plate 61 is slidably disposed on the top surface of the lower positioning ring 1, and the dovetail block 63 is welded and fixed to the bottom surface of the vertical plate 61, sliding within the dovetail groove 13. This allows the vertical plate 61 to slide on the top surface of the lower positioning ring 1 while simultaneously preventing the vertical plate 61 from detaching from the lower positioning plate.

[0041] Reference Figure 1 and Figure 2 As shown, the horizontal plate 62 is horizontally welded and fixed to the vertical plate 61. When the measuring device is used, the vertical plate 61 is slid away from the axis of the lower positioning ring 1, so that the bottom surface of the horizontal plate 62 is placed on the top edge of the pump well 8, so that the lower positioning ring 1 can be stably located in the pump well 8 before the concentric fixing mechanism 5 is fixed.

[0042] Reference Figure 3 and Figure 4 As shown, there are at least three sets of concentric fixing mechanisms 5 on the lower positioning ring 1. In this embodiment, there are three sets of concentric fixing mechanisms 5, which are distributed at equal angles along the circumference of the lower positioning ring 1. Connecting holes 11 are provided on the inner circumferential wall of the lower positioning ring 1, and the connecting holes 11 correspond one-to-one with the concentric fixing mechanisms 5.

[0043] Reference Figure 3 and Figure 4 As shown, the concentric fixing mechanism 5 includes a threaded rod 51, an abutting tube 52, a first limiting member 53, a second limiting member 54, and a synchronous drive assembly 55. A second annular groove 111 is provided on the inner wall of the connecting hole 11. The first limiting member 53 is fixed to the threaded rod 51. The threaded rod 51 is horizontally rotatably disposed in the connecting hole 11, and the first limiting member 53 is rotatably disposed in the second annular groove 111, thus preventing the threaded rod 51 from sliding laterally.

[0044] Reference Figure 3 and Figure 4 As shown, a first annular groove 12 is formed on the outer peripheral wall of the lower positioning ring 1, and the axis of the first annular groove 12 coincides with the axis of the connecting hole 11. The abutment tube 52 is horizontally slidably disposed in the first annular groove 12, and the axis of the abutment tube 52 coincides with the axis of the threaded rod 51. The abutment tube 52 is threadedly connected to the threaded rod 51.

[0045] Reference Figure 3 and Figure 4As shown, two limiting grooves 121 are formed on the inner wall of the first annular groove 12. The length direction of the limiting grooves 121 is parallel to the length direction of the threaded rod 51, and the two limiting grooves 121 are symmetrically distributed along the circumferential direction of the inner peripheral wall of the first annular groove 12. Two second limiting members 54 are welded and fixed on the outer peripheral wall of the contact tube 52, and the two second limiting members 54 are slidably disposed in the two limiting grooves 121 respectively.

[0046] Reference Figure 3 and Figure 4 As shown, the synchronous drive assembly 55 includes a fixed frame 551, a vertical shaft 552, a drive bevel gear 553, and a driven bevel gear 554. The fixed frame 551 is welded and fixed to the lower positioning ring 1. The vertical shaft 552 passes vertically through the fixed frame 551 and is rotatably mounted on the fixed frame 551. The axis of the vertical shaft 552 coincides with the axis of the lower positioning ring 1. The drive bevel gear 553 is coaxially fixed to the bottom end of the vertical shaft 552 and is located below the fixed frame 551. A handwheel is fixedly connected to the top end of the vertical shaft 552 and is located above the fixed frame 551.

[0047] Reference Figure 3 As shown, the driven bevel gear 554 corresponds one-to-one with the threaded rod 51 and is coaxially welded and fixed to the end of each threaded rod 51 away from the contact tube 52. The driven bevel gear 554 meshes with the driving bevel gear 553.

[0048] Reference Figure 2 and Figure 3 As shown, three connecting rods 3 are vertically welded and fixed on the top surface of the lower positioning ring 1. The three connecting rods 3 are evenly distributed along the circumference of the lower positioning ring 1. The upper positioning ring 2 is located above the connecting rods 3. The tops of the three connecting rods 3 are welded and fixed to the bottom surface of the upper positioning ring 2.

[0049] Reference Figure 2 and Figure 5 As shown, there are no fewer than three sets of concentric positioning mechanisms 4 on the upper positioning ring 2. In this embodiment, there are three sets of concentric positioning mechanisms 4, which are evenly distributed along the circumference of the upper positioning ring 2.

[0050] Reference Figure 3 and Figure 5 As shown, the concentric positioning mechanism 4 includes a transverse rod 41, an abutment block 42, a stop block 43, and a thrust assembly 44. A sliding hole 21 is provided on the inner wall of the upper positioning ring 2, and the transverse rod 41 is horizontally slidably disposed within the sliding hole 21. A retaining groove 211 is provided on the inner wall of the sliding hole 21, located at the upper part of the sliding hole 21. The length direction of the retaining groove 211 is parallel to the axial direction of the transverse rod 41. The stop block 43 is welded and fixed to the transverse rod 41, and the stop block 43 is slidably disposed within the retaining groove 211.

[0051] Reference Figure 2 and Figure 5 As shown, the contact block 42 is located outside the upper positioning ring 2. The contact block 42 is welded and fixed to one end of the transverse rod 41 located outside the upper positioning ring 2. An inclined surface 421 is provided on the side of the contact block 42 away from the transverse rod 41, and the inclined surface 421 is set upward. A scale 411 is provided on the side of the transverse rod 41, and a reading can be formed between the scale 411 and the outer peripheral surface of the upper positioning ring 2.

[0052] Reference Figure 5 As shown, the thrust assembly 44 is disposed in the stop groove 211. The thrust assembly 44 is a thrust spring 441. One end of the thrust spring 441 abuts against the side of the stop block 43 away from the stop block 42, and the other end of the thrust spring 441 abuts against the side wall of the stop groove 211 away from the stop block 42.

[0053] The implementation principle of the concentricity measuring device for a pump station base according to an embodiment of this application is as follows: Before installing the pump base 7, the concentricity measuring device is first installed inside the pump well 8. First, the vertical plate 61 is slid away from the axis of the lower positioning ring 1, so that the side of the horizontal plate 62 away from the vertical plate 61 is located outside the outer circumference of the positioning ring. The lower positioning ring 1 is then inserted into the pump well 8, and the bottom surface of the horizontal plate 62 can abut against the top edge of the pump well 8, so that the measuring device can be stably positioned on the pump well 8.

[0054] Then turn the handwheel to make the drive bevel gear 553 drive the three driven bevel gears 554 to rotate simultaneously. Since the threaded rod 51 is threadedly connected to the contact tube 52, the three contact tubes 52 slide away from the axis of the lower positioning ring 1 at the same time until the three contact tubes 52 are all tightly pressed against the inner peripheral wall of the pump well 8, thereby fixing the lower positioning ring 1 inside the pump well 8.

[0055] Then, the pump base 7 is fitted over the upper positioning ring 2 until the pump base 7 touches the top edge of the pump. During the descent of the pump base 7, under the action of the inclined surface 421 on the contact block 42, the transverse rod 41 overcomes the elastic force of the thrust spring 441 and slides upward to the inner side of the positioning ring 2, so that each transverse rod 41 forms a reading between itself and the outer circumferential surface of the upper positioning ring 2.

[0056] Finally, the construction personnel only need to adjust the position of the pump base 7 until the readings on each horizontal rod 41 are consistent to complete the concentricity correction of the inner ring of the pump base 7 and the pump well 8. The construction personnel do not need to take repeated measurements, thereby improving the installation efficiency of the submersible pump unit.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for measuring the concentricity of a pump station base, characterized in that: The system includes a lower positioning ring (1) concentrically fixed to the inner wall of the pump well (8), an upper positioning ring (2) coaxially arranged with the lower positioning ring (1), and a connecting rod (3) fixed to the upper positioning ring (2) and the lower positioning ring (1) respectively. The upper positioning ring (2) is provided with a concentric positioning mechanism (4). There are no less than three sets of concentric positioning mechanisms (4) and they are distributed along the periphery of the upper positioning ring (2). The concentric positioning mechanism (4) includes a transverse rod (41) slidably arranged on the upper positioning ring (2) and a thrust assembly (44) that prevents the transverse rod (41) from sliding to the inner side of the upper positioning ring (2). The transverse rod (41) located outside the upper positioning ring (2) is fixedly connected to an abutting block (42) for abutting against the inner ring of the pump base (7). The transverse rod (41) is provided with a scale (411). The lower positioning ring (1) is provided with a concentric fixing mechanism (5), and there are no fewer than three sets of the concentric fixing mechanism (5) distributed along the periphery of the lower positioning ring (1). A connecting hole (11) is provided on the inner peripheral wall of the lower positioning ring (1). The concentric fixing mechanism (5) includes a threaded rod (51) rotatably disposed on the inner wall of the connecting hole (11). A first limiting member (53) for hindering the axial movement of the threaded rod (51) is provided between the threaded rod (51) and the lower positioning ring (1). The outer peripheral wall of the lower positioning ring (1) is provided with a first limiting member (53) for hindering the axial movement of the threaded rod (51). A first annular groove (12) is provided that coincides with the axis of the connecting hole (11). A contact tube (52) for abutting against the inner wall of the pump well (8) is slidably arranged in the first annular groove (12). A second limiting member (54) for preventing the contact tube (52) from rotating is provided between the contact tube (52) and the lower positioning ring (1). The contact tube (52) is threadedly connected to the threaded rod (51). The concentric fixing mechanism (5) also includes a synchronous drive assembly (55) for synchronously driving the threaded rod (51) to rotate. The synchronous drive assembly (55) includes a fixed frame (551) fixed on the lower positioning ring (1), a vertical shaft (552) rotatably mounted on the fixed frame (551), a drive bevel gear (553) coaxially fixed on the vertical shaft (552), and a driven bevel gear (554) coaxially fixed to one end of the threaded rod (51) away from the contact tube (52). The axis of the vertical shaft (552) coincides with the axis of the lower positioning ring (1), and the driven bevel gears (554) mesh with the drive bevel gears (553). The inner wall of the connecting hole (11) is provided with a second annular groove (111), the first limiting member (53) is fixed on the threaded rod (51), and the first limiting member (53) is rotatably disposed in the second annular groove (111); A limiting groove (121) is provided on the inner wall of the first annular groove (12). The length direction of the limiting groove (121) is parallel to the length direction of the threaded rod (51). The second limiting member (54) is fixed on the outer peripheral wall of the contact tube (52) and is slidably disposed in the limiting groove (121).

2. The device for determining the concentricity of a pump station base according to claim 1, characterized in that: The upper positioning ring (2) has a sliding hole (21) on its inner wall. The transverse rod (41) is slidably disposed in the sliding hole (21). The inner wall of the sliding hole (21) has a retaining groove (211). The length direction of the retaining groove (211) is parallel to the axial direction of the transverse rod (41). A stop block (43) is fixedly connected to the transverse rod (41). The stop block (43) is slidably disposed in the retaining groove (211).

3. The device for determining the concentricity of a pump station base according to claim 2, characterized in that: The thrust assembly (44) is disposed in the stop groove (211). The thrust assembly (44) is a thrust spring (441). One end of the thrust spring (441) abuts against the side of the stop block (43) away from the abutting block (42), and the other end of the thrust spring (441) abuts against the side wall of the stop groove (211) away from the abutting block (42).

4. The device for determining the concentricity of a pump station base according to claim 1, characterized in that: The lower positioning ring (1) is fixedly connected to an overlapping mechanism (6). There are no less than two sets of overlapping mechanisms (6) on the lower positioning ring (1) and they are distributed along the circumference of the lower positioning ring (1). The overlapping mechanism (6) includes a vertical plate (61) slidably disposed on the lower positioning ring (1) and a horizontal plate (62) for abutting against the top edge of the pump well (8). The horizontal plate (62) is fixedly connected to the vertical plate (61).

5. The device for determining the concentricity of a pump station base according to claim 4, characterized in that: The top surface of the lower positioning ring (1) is provided with a dovetail groove (13), and the bottom surface of the vertical plate (61) is fixedly connected with a dovetail block (63), which is slidably disposed in the dovetail groove (13).

6. The device for determining the concentricity of a pump station base according to claim 1, characterized in that: The abutment block (42) has an inclined surface (421) on its side away from the transverse rod (41), and the inclined surface (421) is facing upward.

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