Machining method of pump cover

Abstract

The invention provides a machining method of a pump cover, and belongs to the technical field of machine manufacturing. The machining method of the pump cover comprises the steps that a first end plate, a second end plate and a barrel are provided, the first end plate is provided with a water inlet hole, the second end plate is provided with a water outlet hole, the area of the first end plate is smaller than that of the second end plate, and the barrel wall of the barrel is of a double-layer structure; the first end plate and the second end plate are welded to the cylinder body; the first end plate is clamped with the water inlet hole as the positioning reference, and the end face of the second end plate and the water outlet hole are machined; and the second end plate is clamped with the water outlet hole as the positioning reference, and the end face of the first end plate and the water inlet hole are machined. The machining precision of the pump cover can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical manufacturing, and in particular relates to a method for processing a pump cover. Background Art

[0002] The pump cover is an indispensable part of the pump body. The pump cover is used to protect the internal structure of the pump body. The pump cover is generally a thin-walled eccentric shell, including a first end plate with a smaller area, a second end plate with a larger area, and a cylindrical barrel connected between the first end plate and the second end plate. The barrel is a thin-walled double-layer structure, and a channel is formed in the side wall of the barrel. Among them, the first end plate has a water inlet hole, and the second end plate has a water outlet hole.

[0003] Since the water inlet and outlet holes at both ends of the pump cover are eccentric holes, a horizontal boring machine is used for processing. That is, the first end plate and the second end plate are first welded to the two ends of the cylinder to form a welded part, and then the cylinder of the welded part is clamped by the fixture of the boring machine. Then the water inlet and outlet holes, as well as the end faces of the first end plate and the second end plate are processed respectively, so that the end faces of the first end plate and the second end plate, the water inlet and outlet holes, etc. meet the requirements of the drawings.

[0004] However, since the cylinder is a thin-walled double-layer structure, direct clamping of the cylinder is very likely to cause deformation and affect the processing accuracy. Summary of the invention

[0005] The embodiment of the present disclosure provides a method for processing a pump cover, which can improve the processing accuracy of the pump cover. The technical solution is as follows:

[0006] The disclosed embodiment provides a method for processing a pump cover, the method comprising: providing a first end plate, a second end plate and a cylinder, the first end plate having a water inlet hole, the second end plate having a water outlet hole, the area of ​​the first end plate being smaller than the area of ​​the second end plate, and the cylinder wall of the cylinder being a double-layer structure; welding the first end plate and the second end plate to the cylinder respectively; clamping the first end plate with the water inlet hole as a positioning reference, and processing the end face of the second end plate and the water outlet hole; clamping the second end plate with the water outlet hole as a positioning reference, and processing the end face of the first end plate and the water inlet hole.

[0007] In another implementation of the present disclosure, the first end plate is clamped using the water inlet hole as a positioning reference, including: placing a base on a worktable of a vertical lathe, the base having a center hole and a first positioning hole, the first positioning hole deviating from the center hole; placing the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole; and detachably connecting the upper pressing plate and the lower pressing plate to opposite sides of the base along the axial direction of the first positioning hole, so as to press the first end plate onto the base.

[0008] In another implementation of the present disclosure, placing the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole includes:

[0009] A positioning pin is installed in the water inlet hole and the first positioning hole. The positioning pin includes a coaxially connected limit platform and a shaft segment. The outer circle of the shaft segment matches the inner wall of the first positioning hole, and the outer circle of the limit platform matches the inner wall of the water inlet hole.

[0010] In another implementation of the present disclosure, the water inlet hole is used as a positioning reference to clamp the first end plate, and the method also includes: arranging a plurality of support arms outside the cylinder body at circumferential intervals with the center hole as the center, and connecting the bottom ends of the plurality of support arms to the base respectively; a plurality of tightening member groups are arranged on the support arms, and the plurality of tightening member groups are arranged at intervals along the length direction of the support arms, each of the tightening member groups includes a plurality of first tightening members corresponding to the plurality of support arms one by one, and the length direction of the first tightening members is the radial direction of the center hole, one end of each of the first tightening members is connected to the corresponding support arm, and the other end of each of the first tightening members is abutted against the outer wall of the cylinder.

[0011] In another implementation of the present disclosure, the first end plate is clamped using the water inlet hole as a positioning reference, and also includes: a second tightening member is arranged on each of the support arms, the length direction of each of the second tightening members is the radial direction of the center hole, one end of each of the second tightening members is connected to the corresponding support arm, and the other end of each of the second tightening members is abutted against the outer peripheral wall of the second end plate.

[0012] In another implementation of the present disclosure, the method further includes: before processing the end surface of the second end plate and the water outlet, arranging a pad between the base and each of the support arms, so that the pad is detachably connected to the corresponding support arm and the base, respectively; adjusting the tightness of the connection between the pad and the support arm, and fine-tuning the second end plate so that the circular runout of the water outlet meets the requirements.

[0013] In another implementation of the present disclosure, the second end plate is clamped using the water outlet as a positioning reference, including: removing the upper pressure plate and hoisting the welded component; removing the support arm, the first clamping component and the second clamping component in sequence; installing a positioning plate on the base, the positioning plate having a second positioning hole, the second positioning hole being coaxial with the first positioning hole; hoisting the welded component outside the positioning plate, and making the second end plate sleeved outside the positioning plate, the outer circle of the positioning plate being in contact with the inner wall of the water outlet; distributing a plurality of clamping blocks at intervals along the circumference of the second end plate, so that the second end plate is clamped between the clamping blocks and the base.

[0014] In another implementation of the present disclosure, the processing method of the pump cover also includes: before processing the end surface of the first end plate and the water inlet hole, arranging the multiple support arms outside the cylinder at circumferential intervals with the first positioning hole as the center; arranging the multiple tightening member groups on each of the support arms, and making one end of the first tightening member connected to the corresponding support arm, and the other end of the first tightening member abuts against the outer wall of the cylinder.

[0015] In another implementation of the present disclosure, the outer wall of the cylinder close to the first end plate has an inclined conical surface; before processing the end surface of the first end plate and the water inlet hole, the processing method of the pump cover also includes: setting an inclined pull block between the inclined conical surface and the support arm opposite to the inclined conical surface, so that the inclined pull block is connected to the support arm opposite to the inclined conical surface; setting the second tightening member on the inclined pull block, so that one end of the second tightening member is connected to the inclined pull block, and the other end of the second tightening member abuts against the inclined conical surface.

[0016] In another implementation of the present disclosure, the first end plate and the second end plate are respectively welded to the cylinder to obtain a welded part, including: alternately welding the weld between the first end plate and the cylinder and the weld between the second end plate and the cylinder.

[0017] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0018] When the pump cover is processed by the processing method of the pump cover provided in the embodiment of the present disclosure, since the processing method of the pump cover is to first use the water inlet hole as the positioning reference, clamp the first end plate, and process the second end plate, this can avoid deformation caused by clamping the cylinder, and greatly improve the processing accuracy. Then, after the second end plate is processed, the second end plate is clamped to process the first end plate, which can also avoid deformation caused by clamping the cylinder, and thus improve the processing accuracy. In this way, the two end plates can be processed separately, so that the welded parts can meet the size requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a front view of a pump cover provided by an embodiment of the present disclosure;

[0021] Figure 2 yes Figure 1 Middle H view;

[0022] Figure 3 yes Figure 1 Middle F direction view;

[0023] Figure 4 yes Figure 1 The enlarged image at a in the middle;

[0024] Figure 5 is a flow chart of a method for processing a pump cover provided by an embodiment of the present disclosure;

[0025] Figure 6 is a flow chart of another method for processing a pump cover provided by an embodiment of the present disclosure;

[0026] Figure 7 is a schematic structural diagram of a first end plate provided in an embodiment of the present disclosure;

[0027] Figure 8 yes Figure 7 The cross-sectional view along the AA direction;

[0028] Fig. 9 is a schematic structural diagram of a second end plate provided in an embodiment of the present disclosure;

[0029] Fig.10 yes Fig. 9 The cross-sectional view along the BB direction;

[0030] Fig.11is a schematic diagram of clamping of the first end plate;

[0031] Fig.12 yes Fig.11 A top view of

[0032] Fig.13 It is a schematic diagram of the structure of the base;

[0033] Fig.14 yes Fig.13 Cross-sectional view along CC direction;

[0034] Fig.15 It is a schematic diagram of the structure of the positioning pin;

[0035] Fig.16 It is a structural schematic diagram of the lower pressure plate;

[0036] Fig.17 It is a structural schematic diagram of the upper pressing plate;

[0037] Fig.18 yes Fig.17 A top view of

[0038] Fig.19 is a schematic diagram of the structure of the support arm;

[0039] Fig. 20 yes Fig.19 Cross-sectional view along DD direction;

[0040] Fig.21 It is a schematic diagram of the structure of the pad;

[0041] Fig. 22 yes Fig.21 Cross-sectional view along FF direction;

[0042] Fig.23 Schematic diagram of clamping of the second end plate;

[0043] Fig.24 yes Fig.23 A top view of

[0044] Fig.25 It is a schematic diagram of the structure of the positioning plate;

[0045] Fig.26 is a schematic diagram of the structure of the compression block;

[0046] Fig. 27 yes Fig.26 A top view of the cross-section along the EE direction;

[0047] Fig.28 It is a structural diagram of the cable-stayed block.

[0048] The symbols in the figure mean the following:

[0049] 100, positioning assembly; 101, base; 1011, center hole; 1012, first positioning hole; 1013, first pin hole; 102, upper pressing plate; 1020, upper connecting hole; 103, lower pressing plate; 1030, lower connecting hole; 104, support arm; 1041, connecting plate; 1042, support plate; 1043, first fixing hole; 1045, second fixing hole; 105, top tightening member group; 1051, first top tightening member; 1052, second top tightening member; 106, cushion block; 1060, stepped connecting hole; 1061, third connecting hole; 107, positioning plate; 1071, second positioning hole; 108, pressing block; 1080, pressing connecting hole; 109, inclined pull block;

[0050] 200, pump cover; 201, first end plate; 2010, water inlet; 20101, cylindrical hole section; 20102, tapered hole section; 2011, first flow channel; 2012, first fluid hole; 202, second end plate; 2020, water outlet; 2021, second flow channel; 2022, arc surface; 2023, plane; 203, cylinder; 2030, channel; 2031, oblique cone surface;

[0051] 301, positioning pin; 3011, shaft segment; 3012, limit table; 302, bolt; 303, cylindrical pin; 304, screw. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0053] In the related art, the indispensable structure in the pump body is the pump cover. Figure 1 The pump cover 200 includes a first end plate 201 with a smaller area, a second end plate 202 with a larger area, and a cylindrical body 203 connected between the first end plate 201 and the second end plate 202 .

[0054] The cylinder 203 is a thin-walled double-layer structure, and a channel 2030 is formed in the side wall of the cylinder 203. The first end plate 201 has a first flow channel 2011, a first fluid hole 2012, and a water inlet hole 2010. One end of the first flow channel 2011 is connected to the channel 2030, and the other end of the first flow channel 2011 is connected to the first fluid hole 2012. The first fluid hole 2012 and the water inlet hole 2010 are both eccentric holes deviated from the center of the first end plate 201.

[0055] The second end plate 202 has a second flow channel 2021 and a water outlet 2020 . One end of the second flow channel 2021 is connected to the channel 2030 , and the other end of the second flow channel 2021 is connected to the water outlet 2020 . The water outlet 2020 is also an eccentric hole deviating from the center of the second end plate 202 .

[0056] See also Figure 2 The center of the first end plate 201 and the center of the second end plate 202 are not concentric, and the first end plate 201 and the second end plate 202 are eccentric structures. The outer periphery of the second end plate 202 includes two symmetrically arranged arc surfaces 2022 and two planes 2023 located between the two arc surfaces 2022. The two arc surfaces 2022 are concentric, and the radius R corresponding to the arc surfaces is 280 mm. The two planes 2023 are arranged in parallel, and the distance between the two planes 2023 is 600 mm.

[0057] See also Figure 3 The first end plate 201 is a circular plate with a diameter of 355 mm. The distance between the first fluid hole 2012 and the water inlet hole 2010 in the first end plate 201 is 74 mm.

[0058] See also Figure 4 The water inlet hole 2010 includes a cylindrical hole section 20101 and a tapered hole section 20102. The inner diameter of the cylindrical hole section 20101 is 106 mm, and the angle between the conical surface and the bottom surface of the tapered hole section 20102 is 45°. The small end of the tapered hole section 20102 has the same inner diameter as the cylindrical hole section 20101 and is connected, and the inner diameter of the large end of the tapered hole section 20102 is 144 mm.

[0059] The present disclosure provides a method for processing a pump cover. Figure 5 As shown, the processing method of the pump cover includes:

[0060] S501: Provide a first end plate, a second end plate and a cylinder.

[0061] The first end plate has a water inlet hole, the second end plate has a water outlet hole, the area of ​​the first end plate is smaller than the area of ​​the second end plate, and the cylinder wall of the cylinder is a double-layer structure.

[0062] S502: Welding the first end plate and the second end plate to the cylinder body respectively to obtain welded parts.

[0063] S503: Using the water inlet hole as a positioning reference, clamping the first end plate, and processing the end surface and the water outlet hole of the second end plate.

[0064] S504: Using the water outlet hole as a positioning reference, clamping the second end plate, and processing the end surface and the water inlet hole of the first end plate.

[0065] When the pump cover is processed by the processing method of the pump cover provided in the embodiment of the present disclosure, since the processing method of the pump cover is to first use the water inlet hole as the positioning reference, clamp the first end plate, and process the second end plate, this can avoid deformation caused by clamping the cylinder, and greatly improve the processing accuracy. Then, after the second end plate is processed, the second end plate is clamped to process the first end plate, which can also avoid deformation caused by clamping the cylinder, and thus improve the processing accuracy. In this way, the two end plates can be processed separately, so that the welded parts can meet the size requirements.

[0066] On the other hand, the present disclosure provides another method for processing a pump cover, such as Figure 6 As shown, the processing method of the pump cover includes:

[0067] S601: Process two steel plates to obtain a first end plate and a second end plate.

[0068] In this embodiment, the first end plate and the second end plate can be obtained by directly milling the two steel plates.

[0069] See also Figure 7 and Figure 8 The first end plate 201 has a water inlet hole 2010, a first fluid hole 2012 and a first flow channel 2011. During processing, the small end of the inner diameter of the water inlet hole 2010 is processed to 100 mm, that is, a processing allowance of 3 mm is left on one side. The inner diameters of the first fluid hole 2012 and the first flow channel 2011 are processed to 5 mm. The hole distance between the first fluid hole 2012 and the water inlet hole 2010 is processed from the theoretical 74±0.2 mm to 74±0.05 mm.

[0070] See also Fig. 9 and Fig.10 The second end plate 202 has a water outlet 2020 and a second flow channel 2021. During processing, the inner diameter of the water outlet 2020 is processed from the theoretical 410 mm to 404 mm, that is, a processing margin of 3 mm is left on one side. The inner diameter of the second flow channel 2021 is processed to 5 mm.

[0071] S602: Welding the first end plate and the second end plate to the cylinder body respectively to obtain welded parts.

[0072] Before welding, the first end of the cylinder is placed outside the first end plate and assembled with the first end plate. During installation, since there is a positioning stop between the first end of the cylinder and the first end plate, it can be quickly positioned through the positioning stop. Then, the second end plate is assembled with the second end of the cylinder. During installation, since there is a positioning stop between the second end of the cylinder and the second end plate, it can be quickly assembled through the positioning stop.

[0073] In this embodiment, in order to reduce welding deformation, the welds between the first end plate and the cylinder and the welds between the second end plate and the cylinder are welded alternately, and the welding is performed symmetrically.

[0074] S603: Clamp the first end plate using the water inlet hole as a positioning reference.

[0075] In this embodiment, the first end plate is clamped by the positioning assembly to position the welded part on the working table of the vertical lathe.

[0076] In this embodiment, Fig.11 and 12 As shown, the positioning assembly 100 includes a base 101 , an upper pressing plate 102 , and a lower pressing plate 103 .

[0077] See also Fig.13 and Fig.14 The base 101 is a circular plate, and the base 101 has a center hole 1011, a first positioning hole 1012, and a first pin hole 1013. The center hole 1011 is located at the geometric center of the base 101, and the first positioning hole 1012 is arranged offset from the center hole 1011. The first pin hole 1013 and the center hole 1011 are respectively located on opposite sides of the first positioning hole 1012. The center hole 1011, the first positioning hole 1012, and the first pin hole 1013 are located on the same plane.

[0078] Continue to see Fig.11 The upper pressing plate 102 and the lower pressing plate 103 are respectively located on opposite sides of the base 101 and are respectively detachably connected to the base 101 .

[0079] In this way, the base 101 can be fixed on the working table of the vertical lathe, and at the same time, the first end plate 201 is clamped and positioned by the upper pressing plate 102 and the lower pressing plate 103 .

[0080] Optionally, step S603 may be implemented in the following manner:

[0081] 6031: Place the base on the work surface of the vertical lathe.

[0082] The base 101 is fixed on the work surface by four clamps of the vertical lathe. When processing on the vertical lathe, the base 101 is placed on the four clamps, and the circular runout of the center hole 1011 of the base 101 is calibrated to be no more than 0.01mm, and the end face runout of the base 101 is no more than 0.02mm. After the four clamps are clamped, the above-mentioned shape and position tolerances are rechecked to be qualified.

[0083] 6032: Place the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole 1012.

[0084] In this embodiment, the water inlet hole 2010 and the first positioning hole 1012 are coaxial through the positioning pin 301 .

[0085] See also Fig.15 The positioning pin 301 includes a coaxially connected shaft section 3011 and a limiting platform 3012 , and the outer diameter of the limiting platform 3012 is greater than the outer diameter of the shaft section 3011 .

[0086] Step 6032 is implemented by:

[0087] Positioning pins are installed in the water inlet hole and the first positioning hole so that the outer circle of the shaft section matches with the inner wall of the first positioning hole, and the outer circle of the limiting platform matches with the inner wall of the water inlet hole.

[0088] Combination Fig.11 First, install the positioning pin 301 at the first positioning hole 1012 of the base 101. The outer circle of the shaft section 3011 of the positioning pin 301 matches with the first positioning hole 1012 of the base 101 (the outer diameter of the shaft section 3011 is Φ50g6mm, and the inner diameter of the first positioning hole 1012 of the base is Φ50H7mm). The outer circle of the limiting platform 3012 of the positioning pin 301 matches with the inner diameter of the small end of the water inlet hole 2010 of the first end plate (the outer diameter of the limiting platform 3012 is Φ99.8g6mm, and the inner diameter of the small end of the water inlet hole is Φ100H7mm). The reason why the outer diameter of the limiting platform 3012 is Φ99.8g6mm is mainly because of the welding deformation, which will change the size of the water inlet hole 2010.

[0089] 6033: The upper pressing plate 102 and the lower pressing plate 103 are detachably connected to opposite sides of the base 101 along the axial direction of the first positioning hole 1012 to press the first end plate onto the base 101 .

[0090] Continue to see Fig.11 , install the lower pressing plate 103 at the bottom of the base 101, and lock the positioning pin 301 and the lower pressing plate 103 with bolts 302. Then install the upper pressing plate 102 on the top of the base.

[0091] See also Fig.16 The lower pressing plate 103 has a lower connecting hole 1030 in the middle thereof. When installing the lower pressing plate 103 , the bolt 302 is inserted into the lower connecting hole 1030 .

[0092] Continue to see Fig.11 In order to further position the first end plate, a cylindrical pin 303 with a diameter of 4.9g6mm is installed in the first fluid hole 2012 and the first pin hole 1013.

[0093] Install the screw 304 on the top of the positioning pin 301, and the thread of the screw 304 is screwed in to a length of about 10 mm, and the protruding length of the screw 304 is about 65 mm. Then install the upper pressure plate 102 on the top of the screw 304 and tighten it with the nut so that the upper pressure plate 102 fits together with the first end plate 201.

[0094] See also Fig.17 and Fig.18 The middle part of the upper pressing plate 102 has an upper connecting hole 1020 penetrating through the side wall. During installation, the screws 304 are connected to the upper connecting hole 1020 of the upper pressing plate 102 .

[0095] Continue to see Fig.11 In this embodiment, the positioning assembly further includes a plurality of support arms 104, a plurality of top tightening member groups 105, and a plurality of second top tightening members 1052. The plurality of top tightening member groups 105 are arranged at intervals along the length direction of the support arms 104, and each top tightening member group 105 includes a plurality of first top tightening members 1051 corresponding to the plurality of support arms 104 one by one, and the length direction of the first top tightening members 1051 is the radial direction of the center hole 1011, one end of each first top tightening member 1051 is connected to the corresponding support arm 104, and the other end of each first top tightening member abuts against the outer wall of the cylinder. The plurality of second top tightening members 1052 correspond to the plurality of support arms 104 one by one, one end of the second top tightening member 1052 is connected to the corresponding support arm 104, and the length direction of the second top tightening member 1052 is the radial direction of the center hole 1011.

[0096] By setting the support arm 104 as above, a mounting base can be provided for the first tightening member 1051. The first tightening member 1051 can tighten the cylinder 203 to prevent the cylinder 203 from shaking during subsequent processing. The second tightening member 1052 can tighten the second end plate 202 to prevent the second end plate 202 from being misaligned.

[0097] In this embodiment, see Fig.19 and 20 , the support arm 104 is an L-shaped angle steel. The support arm 104 includes a connecting plate 1041 and a supporting plate 1042. The connecting plate 1041 and the supporting plate 1042 are vertically welded together. The connecting plate 1041 has two waist-shaped first fixing holes 1043 arranged at intervals. The first fixing hole 1043 is used to connect with the base 101. The supporting plate 1042 is a long strip plate, and a plurality of second fixing holes 1045 are arranged at intervals in the length direction of the supporting plate 1042. The second fixing hole 1045 is used to connect with the first tightening member 1051.

[0098] 6034: A plurality of support arms are arranged outside the cylinder at intervals in a circumferential direction with the central hole as the center, and the bottom ends of the plurality of support arms are detachably connected to the base.

[0099] Since the center of the cylinder is coaxial with the center of the base, multiple support arms are arranged outside the cylinder at intervals in the circumferential direction with the center hole as the center, so that the tightening member can be located around the cylinder, thereby tightening the cylinder around.

[0100] 6035: A plurality of tensioning member groups are respectively arranged on each support arm.

[0101] One end of each first pressing member is connected to the corresponding support arm, and the other end of each first pressing member is in contact with the outer wall of the cylinder.

[0102] Arranging a plurality of tightening member groups at intervals can further increase the tightening effect and improve the stability of the cylinder.

[0103] 6036: A second tightening member is provided on each support arm.

[0104] The second pressing members 1052 correspond to the support arms 104 one by one, and the length direction of each second pressing member 1052 is the radial direction of the center hole 1011. One end of each second pressing member 1052 is connected to the corresponding support arm 104, and the other end of each second pressing member abuts against the outer peripheral wall of the second end plate. Similarly, the second pressing member can be used to tighten the second end plate to improve the stability of the second end plate.

[0105] In this embodiment, in order to make the length of each support arm 104 the same, a cushion block 106 can be arranged between the bottom of each support arm 104 and the base 101. The cushion block 106 is detachably connected to the corresponding support arm 104 and the base 101. By adjusting the height of the cushion block 106, etc., the length of each support arm 104 can be made the same.

[0106] See also Fig.21 and 22 The pad 106 is a block structure, and has a plurality of spaced step connection holes 1060 and a plurality of spaced third connection holes 1061. The step connection holes 1060 are used to connect to the base. The third connection holes 1061 are used to connect to the bottom of the support arm 104. Screws 304 are inserted in both the step connection holes 1060 and the third connection holes 1061. By installing the pad 106, installation requirements of different heights can be met, and manufacturing support arms 104 of different heights can be avoided, thereby saving costs.

[0107] S604: Arrange a cushion block between the base and each support arm, so that the cushion block is detachably connected to the corresponding support arm 104 and the base respectively.

[0108] S605: Adjust the tightness of the connection between the cushion block and the support arm, and make fine adjustments to the second end plate so that the high points and low points of the water outlet holes are symmetrically distributed and the circular runout of the water outlet holes meets the requirements.

[0109] Correct the water outlet hole 2020 in the second end plate processed before welding. By adjusting the locking degree of the connecting bolts 302 between the support arm 104 and the cushion block 106, the high point and the low point of the water outlet hole 2020 are symmetrically distributed, and the circular runout of the water outlet hole 2020 is not greater than 0.5mm.

[0110] S606: Processing the end surface and the water outlet of the second end plate.

[0111] The end surface of the second end plate is processed so that the thickness of the second end plate is 30 mm. The total height of the pump cover is 953 mm, the flatness is not greater than 0.04, and the surface roughness is Ra1.6. Cutting parameters: n = 30-50 r / min, f = 0.12-0.16 mm / r, ap = 0.5-1 mm.

[0112] The large end of the water outlet is processed so that the inner diameter of the large end of the water outlet is 430 mm, the depth of the large end of the water outlet is 18.72 (0 / +0.05) mm, and the verticality relative to the A reference is not greater than 0.1, and the surface roughness is Ra1.6. Cutting parameters: rough machining n = 30-50 r / min, f = 0.12-0.16 mm / r, ap = 0.5 mm, fine machining n = 30-50 r / min, f = 0.12-0.16 mm / r, ap = 0.15-0.2 mm. The A reference is a horizontal plane parallel to the base 10.

[0113] The small end of the water outlet is processed so that the inner diameter of the small end of the water outlet is 410mm and the surface roughness is Ra3.2. Cutting parameters: n = 30-50r / min, f = 0.12-0.16mm / r, ap = 0.5-1mm. Cutting parameters: n = 30-50r / min, f = 0.12-0.16mm / r, ap = 0.5-1mm.

[0114] See also Fig.23 and 24 In this embodiment, the positioning assembly further includes a positioning plate 107 and a plurality of pressing blocks 108. The outer diameter of the positioning plate 107 is equal to the inner diameter of the water outlet 2020, and the plurality of pressing blocks 108 are spaced apart on the base 101 and are located on the same side of the base 101 as the positioning plate 107.

[0115] See also Fig.25 The positioning plate 107 has a second positioning hole 1071. The second positioning hole 1071 has the same inner diameter as the first positioning hole 1012, and the positioning plate 107 is detachably connected to the base 101.

[0116] See also Fig.26 and Fig. 27The clamping block 108 is a block structure, and a clamping connection hole 1080 is provided in the middle of the clamping block 108. The bolt 302 is inserted into the clamping connection hole 1080, and the outer peripheral plane of the second end plate 202 is clamped by the clamping block 108 and the base 101 to limit the second end plate.

[0117] S607: Using the water outlet as a positioning reference, clamp the second end plate.

[0118] Optionally, step S607 is implemented in the following manner:

[0119] 6071: Remove the upper pressure plate and hoist the welded parts.

[0120] 6072: Remove the support arm, the first top fastening member and the second top fastening member in sequence;

[0121] 6073: Install the positioning plate 107 on the base 101, and the second positioning hole 1071 is coaxial with the first positioning hole 1012.

[0122] 6074: Hang the welded component outside the positioning plate 107, and make the second end plate sleeve outside the positioning plate 107.

[0123] 6075: Multiple clamping blocks 108 are distributed at intervals along the circumference of the second end plate, and the second end plate is clamped between the clamping blocks 108 and the base.

[0124] 6076: Multiple support arms are arranged outside the weldment at intervals in the circumferential direction with the first positioning hole as the center.

[0125] 6077: A plurality of tensioning member groups are respectively arranged on each supporting arm, and one end of a first tensioning member is connected to the corresponding supporting arm, and the other end of the first tensioning member is in contact with the outer wall of the cylinder.

[0126] That is to say, according to Fig.23 For assembly, the positioning disk 107 is placed on the base 101, and the positioning pin 301 is inserted into the second positioning hole 1071 of the positioning disk 107 and the first positioning hole 1012 of the base 101. The positioning disk 107 is pressed tightly with the upper pressure plate 102 and the screw 304. The cushion block 106 is installed on the base. Then, the second end plate of the weldment is facing downward, and the water outlet hole 2020 of the second end plate is fitted with the outer circle of the positioning disk 107. At the same time, the water inlet hole 2010 of the first end plate is corrected so that the water inlet hole coincides with the center of the machine tool reinstallation, and the high and low points of the circular runout of the water inlet hole 2010 are symmetrically distributed. Next, two clamping blocks 108 are used to clamp the side of the second end plate away from the first end plate. Next, the support arm 104 is installed so that the support arm is connected to the corresponding cushion block.

[0127] In this embodiment, a side of the cylinder close to the first end plate is an inclined conical surface 2031 .

[0128] See also Fig.28 The positioning assembly also includes an inclined pull block 109, which is located between the support arm 104 opposite to the inclined cone surface and the inclined cone surface 2031, and is detachably connected to the support arm.

[0129] Since the centers of the first end plate and the second end plate of the pump cover are not concentric, and the outer wall of the pump cover is an oblique cone. Therefore, when the first and second tightening members on the four support arms are used to hold the outer circle of the pump cover, the top is symmetrically distributed. However, when the second end plate is facing downward, the installation position of the support arm is changed compared to the first end plate facing downward, and the height position of the support arm against the outer circle of the pump cover is also changed. Therefore, the first end plate needs to be tightened by an inclined pull block.

[0130] The above step S607 also includes:

[0131] 6078: An inclined pull block is arranged between the inclined cone surface and the support arm 104 opposite to the inclined cone surface, so that the inclined pull block 109 is detachably connected to the support arm opposite to the inclined cone surface.

[0132] 6079: A second tightening member is arranged on the inclined pull block, so that one end of the second tightening member is connected to the inclined pull block, and the other end of the second tightening member is in contact with the inclined conical surface.

[0133] 6080: A second jacking piece is provided on each of the remaining support arms that are not opposite to the inclined cone surface, so that one end of the second jacking piece is connected to the corresponding support arm, and the other end of the second jacking piece is in contact with the cylinder. In this way, the inclined pull block can cooperate with the second jacking piece to prevent the first end plate from shaking.

[0134] S608: Processing the end surface and the water inlet hole of the first end plate.

[0135] The water inlet hole is processed so that the diameter of the water inlet hole is Φ106H7(0 / +0.035)mm, the hole distance between the water inlet hole and the first flow channel hole is ensured to be 74±0.2mm, and the chamfer is 19X45°, and the surface roughness is Ra12.5.

[0136] Cutting parameters: rough turning n = 30-50r / min, f = 0.12-0.16mm / r, ap = 0.5-1mm, fine turning n = 30-50r / min, f = 0.12-0.16mm / r, ap = 0.1-0.15mm.

[0137] Next, the first O-ring groove is machined on the first end plate with a diameter of Φ167 (0 / +0.25) mm, a depth of 2.75 (0 / +0.1) mm, a width of 5 (0 / +0.25) mm, a groove bottom rounding of R0.5, a groove mouth rounding of R0.2, and a surface roughness of Ra3.2. Cutting parameters: n = 20-30 r / min, f = 0.04-0.05 mm / r, ap = 0.5-1 mm. The second O-ring groove is machined with a diameter of Φ132 (0 / +0.25) mm, a depth of 2.75 (0 / +0.1) mm, a width of 5 (0 / +0.25) mm, a groove bottom rounding of R0.5, a groove mouth rounding of R0.2, and a surface roughness of Ra3.2. Cutting parameters: n = 20-30 r / min, f = 0.04-0.05 mm / r, ap = 0.5-mm. The annular groove is Φ153mm, with a depth of 2mm, a width of 5mm and a surface roughness of Ra3.2. Cutting parameters: n=20-30r / min, f=0.04-0.05mm / r, ap=0.5-1mm.

[0138] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for processing a pump cover, characterized in that: The processing method of the pump cover comprises: A first end plate, a second end plate and a cylinder are provided, wherein the first end plate has a water inlet hole, the second end plate has a water outlet hole, the area of ​​the first end plate is smaller than the area of ​​the second end plate, and the cylinder wall of the cylinder is a double-layer structure; Welding the first end plate and the second end plate to the cylinder respectively; Using the water inlet hole as a positioning reference, clamping the first end plate, and processing the end surface of the second end plate and the water outlet hole; The second end plate is clamped with the water outlet hole as a positioning reference, and the end surface of the first end plate and the water inlet hole are processed.

2. The method for processing a pump cover according to claim 1, characterized in that: The method of clamping the first end plate by taking the water inlet hole as a positioning reference comprises: Placing a base on a working table of a vertical lathe, wherein the base (101) has a center hole (1011) and a first positioning hole (1012), and the first positioning hole (1012) deviates from the center hole (1011); Placing the first end plate on the base (101) so that the water inlet hole and the first positioning hole (1012) are coaxial; The upper pressing plate (102) and the lower pressing plate (103) are detachably connected to opposite sides of the base (101) along the axial direction of the first positioning hole (1012) to press the first end plate onto the base (101).

3. The method for processing a pump cover according to claim 2, characterized in that: Placing the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole (1012) comprises: A positioning pin is installed in the water inlet hole and the first positioning hole. The positioning pin includes a coaxially connected limit platform and a shaft segment. The outer circle of the shaft segment matches the inner wall of the first positioning hole, and the outer circle of the limit platform matches the inner wall of the water inlet hole.

4. The method for processing a pump cover according to claim 2, characterized in that: The method of clamping the first end plate by taking the water inlet hole as a positioning reference also includes: Arranging a plurality of support arms (104) circumferentially outside the cylinder with the central hole as the center, and connecting the bottom ends of the plurality of support arms (104) to the base (101) respectively; A plurality of tensioning member groups (105) are provided on the support arm (104), and the plurality of tensioning member groups (105) are arranged at intervals along the length direction of the support arm (104); each of the tensioning member groups (105) comprises a plurality of first tensioning members (1051) corresponding one-to-one to the plurality of support arms (104), and the length direction of the first tensioning members (1051) is the radial direction of the center hole (1011); one end of each of the first tensioning members (1051) is connected to the corresponding support arm (104), and the other end of each of the first tensioning members (1051) is in contact with the outer wall of the cylinder.

5. The method for processing a pump cover according to claim 4, characterized in that: The method of clamping the first end plate by taking the water inlet hole as a positioning reference also includes: A second tightening member is arranged on each of the support arms, the length direction of each of the second tightening members (1052) is the radial direction of the center hole (1011), one end of each of the second tightening members (1052) is connected to the corresponding support arm (104), and the other end of each of the second tightening members is abutted against the outer peripheral wall of the second end plate.

6. The method for processing a pump cover according to claim 4, characterized in that: The method further comprises: Before processing the end surface of the second end plate and the water outlet, a cushion block is arranged between the base and each of the support arms, so that the cushion block (106) is detachably connected to the corresponding support arm (104) and the base (101); The connection tightness between the cushion block and the support arm is adjusted, and the second end plate is fine-tuned so that the circular run-out of the water outlet meets the requirements.

7. The method for processing a pump cover according to claim 5, characterized in that: The method of clamping the second end plate by taking the water outlet as a positioning reference comprises: Dismantle the upper pressing plate and hoist the welding parts; Remove the support arm, the first tightening member and the second tightening member in sequence; The positioning plate is mounted on the base, wherein the positioning plate (107) has a second positioning hole (1071), and the second positioning hole is coaxial with the first positioning hole; The welding part is hoisted outside the positioning plate, and the second end plate is sleeved outside the positioning plate, and the outer circle of the positioning plate (107) is in contact with the inner wall of the water outlet hole; A plurality of pressing blocks are distributed at intervals along the circumference of the second end plate, so that the second end plate is clamped between the pressing blocks and the base.

8. The method for processing a pump cover according to claim 7, characterized in that: The processing method of the pump cover also includes: Before processing the end surface of the first end plate and the water inlet hole, the plurality of support arms are arranged outside the cylinder at intervals in a circumferential direction with the first positioning hole as the center; The plurality of pressing member groups are respectively arranged on each of the support arms, and one end of the first pressing member is connected to the corresponding support arm, and the other end of the first pressing member is in contact with the outer wall of the cylinder.

9. The method for processing a pump cover according to claim 8, characterized in that: The outer wall of the cylinder close to the first end plate has an oblique conical surface; Before processing the end surface of the first end plate and the water inlet hole, the processing method of the pump cover further includes: An oblique pull block is arranged between the oblique conical surface and the support arm (104) opposite to the oblique conical surface, so that the oblique pull block (109) is connected to the support arm opposite to the oblique conical surface; The second jacking piece is arranged on the oblique pull block, so that one end of the second jacking piece is connected to the oblique pull block, and the other end of the second jacking piece is in contact with the oblique cone surface.

10. The method for processing a pump cover according to any one of claims 1 to 9, characterized in that: The first end plate and the second end plate are respectively welded to the cylinder to obtain a welded part, comprising: The welds between the first end plate and the cylinder and the welds between the second end plate and the cylinder are welded alternately.

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