Positioning fixture for processing ceramic slag slurry pump volute shell

Abstract

The utility model discloses a kind of positioning jigs for ceramic slag slurry pump volute shell machining, including positioning part, locating plate and the transition plate fixedly connected between positioning part and locating plate;The outer circle of the positioning part is equipped with the circular outer positioning surface for cooperating with the mounting hole on volute shell, the locating gap for accommodating the water outlet pipe of volute shell is equipped on the locating plate, a pair of locking screws for clamping water outlet pipe are threadedly connected on the locating plate.The utility model can reduce the number of alignment or alignment difficulty when processing volute shell, and the water outlet pipe of volute shell does not need to be marked when boring, so that the processing efficiency of volute shell can be improved, the processing error is reduced, and the processing difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of processing technology for slurry pump flow components, and in particular to a positioning jig for processing the volute casing of a ceramic slurry pump. Background Technology

[0002] Silicon carbide ceramic slurry pumps are a new type of slurry pump that has developed rapidly in recent years, and has been widely recognized by the market due to its excellent wear resistance. The volute of a silicon carbide ceramic slurry pump is generally made by combining a metal volute shell with a silicon carbide ceramic lining. The manufacturing precision of the volute shell directly affects the bonding precision of the ceramic lining and the assembly precision of the entire pump.

[0003] like Figure 5-7 As shown, the key dimensions of the volute housing 7 are the diameter C and coaxiality of the mounting holes 8 at both ends of the main body 5 of the volute housing 7, the vertical distance A from the center of the mounting hole 8 to the axis of the water outlet pipe 6 of the volute housing 7, and the vertical distance B from the center of the mounting hole 8 to the end face of the water outlet pipe 6.

[0004] The conventional shell machining scheme is as follows:

[0005] 1. Mounting hole 8 at one end of the main body 5 of the vertical car;

[0006] 2. Turn the volute housing 7 over and use a dial indicator to align it with the machined mounting hole 8 as a reference. Then, machine the mounting hole 8 at the other end of the main body 5.

[0007] 3. Draw the alignment line for machining the outer circle of the water pipe outlet 6, and bore the outer circle and end face of the water pipe on a boring machine.

[0008] The disadvantages of this processing method are:

[0009] 1. After the mounting hole 8 at one end of the main body 5 is machined and flipped, a dial indicator needs to be used for alignment to ensure the coaxiality of the two mounting holes 8 after machining. The alignment process requires manual operation with the help of a dial indicator, which is inefficient and the alignment result is closely related to the operator's experience and skill level. The operator's own skill level has a great influence on the processing result.

[0010] 2. The vertical distance A from the center of the mounting hole 8 to the axis of the water outlet pipe 6 is ensured by the fitter's scribing. Since the inside of the mounting hole 8 is hollow, it is difficult to determine its center point. Therefore, manual scribing has large errors and low efficiency.

[0011] 3. Similarly, due to the difficulty in determining the center of the mounting hole 8, the vertical distance B from the center of the mounting hole 8 to the end face of the water outlet pipe 6 is also difficult to measure.

[0012] Patent CN208068026U discloses a volute machining device with a circular flange for the air outlet. The device features a pedal with through holes corresponding to the support legs. A wire is connected to the upper end of the extrusion plate, and the other end of the wire extends from the upper left side of the slot's inner cavity out of the worktable. The end of the wire is fixed to the lower pedal. In this application, the extrusion plate moves downwards to abut against the volute body. Thus, under the action of the positioning post, slot, and extrusion plate, the volute is fixed. This fixing method is simple, reliable, and quick, improving processing efficiency. The grinding disc is lowered by pressing a button on the electric push rod, starting the motor for grinding. However, because it can only clamp the volute's outlet portion and then process the outlet end face, it cannot process the volute's mounting holes. Utility Model Content

[0013] The technical problem to be solved by this utility model is to provide a positioning jig for machining the volute casing of a ceramic slurry pump, which solves the problems of low efficiency and large error in the current machining of volute casings.

[0014] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0015] A positioning jig for machining the volute casing of a ceramic slurry pump includes a positioning part, a positioning plate, and a transition plate fixedly connected between the positioning part and the positioning plate. The outer circle of the positioning part is provided with a circular outer positioning surface for cooperating with the mounting hole on the volute casing. The positioning plate is provided with a positioning notch for accommodating the outlet pipe of the volute casing. A pair of locking screws for clamping the outlet pipe are threadedly connected to the positioning plate.

[0016] Furthermore, the positioning notch is V-shaped, the symmetry plane of the positioning notch is parallel to the axis of the positioning part, the distance between the axis of the mounting hole and the axis of the water outlet pipe is A, and the distance between the symmetry plane of the positioning notch and the axis of the positioning part is a, then A = a.

[0017] Furthermore, the axis of the positioning part is parallel to the positioning plate, the distance between the axis of the positioning part and the outer side of the positioning plate is b, and the distance between the end face of the water outlet pipe of the volute housing and the axis of the mounting hole is B, then B > b.

[0018] Furthermore, if the diameter of the outer positioning surface is c and the diameter of the mounting hole is C, then C = c.

[0019] Furthermore, the positioning part includes an annular base plate fixedly connected to the transition plate and a positioning ring fixedly connected to the base plate. The axis of the base plate and the axis of the positioning ring are on the same straight line, which is vertical. The outer positioning surface is located on the outer circle of the positioning ring.

[0020] Furthermore, the upper part of the outer positioning surface has a chamfer.

[0021] Furthermore, two locking screws are symmetrically arranged on both sides of the positioning notch, and the two locking screws are coaxial with their axes perpendicular to the axis of the positioning part.

[0022] The positive effects of this utility model are:

[0023] This invention positions the volute housing using a positioning part and a positioning plate. This reduces the number of alignment steps or the difficulty of alignment during machining of the volute housing. It also eliminates the need for scribing when boring the water outlet pipe of the volute housing, thereby improving machining efficiency, reducing machining errors, and lowering machining difficulty. Attached Figure Description

[0024] Figure 1 This is a perspective view of the present invention;

[0025] Figure 2 This is a top view of the present invention;

[0026] Figure 3 This is a side view of the present invention;

[0027] Figure 4 This is a diagram illustrating the use of this utility model;

[0028] Figure 5 It is a three-dimensional view of the volute shell;

[0029] Figure 6 This is a cross-sectional view of the volute casing;

[0030] Figure 7 yes Figure 6 A sectional view of the EE section;

[0031] In the picture:

[0032] 1. Transition plate; 2. Positioning part; 3. Positioning plate; 4. Positioning notch; 5. Main body; 6. Water outlet pipe; 7. Volute housing; 8. Mounting hole; 9. Outer positioning surface; 10. Locking screw; 11. Positioning ring; 12. Base plate. Detailed Implementation

[0033] Example 1

[0034] like Figures 1 to 3As shown, a positioning jig for machining the volute casing of a ceramic slurry pump includes a positioning part 2, a positioning plate 3, and a transition plate 1 fixedly connected between the bottom of the positioning part 2 and the bottom of the positioning plate 3. The axis of the positioning part 2 is vertical, and the transition plate 1 is arranged horizontally. The outer circle of the positioning part 2 is provided with a circular outer positioning surface 9 for cooperating with the mounting hole 8 on the volute casing 7. The positioning plate 3 is provided with a positioning notch 4 for accommodating the outlet pipe 6 of the volute casing 7. A pair of locking screws 10 for clamping the outlet pipe 6 are threadedly connected to the positioning plate 3.

[0035] The diameter of the outer positioning surface 9 is c, and the diameter of the mounting hole 8 is C, therefore C = c. That is, the basic diameter of the outer positioning surface 9 is the same as the basic diameter of the mounting hole 8. In terms of tolerance selection, the tolerance of the diameter of the outer positioning surface 9 is designed to be half the tolerance of the diameter of the mounting hole 8, which ensures positioning accuracy.

[0036] The lower part of the positioning notch 4 is V-shaped. The two sides of the notch 4 are symmetrical and perpendicular to each other. The symmetrical planes of the two sides of the positioning notch 4 are perpendicular to the transition plate 1 and parallel to the axis of the positioning part 2. The distance between the axis of the mounting hole 8 and the axis of the water outlet pipe 6 is A, and the distance between the symmetrical planes of the two sides of the positioning notch 4 and the axis of the positioning part 2 is a, so A = a. The positioning notch 4 is used for positioning the water outlet pipe 6 and can accurately locate the center of the water outlet pipe 6.

[0037] The axis of the positioning part 2 is parallel to the positioning plate 3. The distance between the axis of the positioning part 2 and the outer side of the positioning plate 3 is b. The distance between the end face of the water outlet pipe 6 of the volute housing 7 and the axis of the mounting hole 8 is B. Then B > b, that is, after the water outlet pipe 6 is placed on the positioning notch 4, the end face of the water outlet pipe 6 will protrude out of the outer end face of the positioning plate 3 and expose the outer circle of the water outlet pipe 6 to be machined, thereby facilitating the boring of the end face and the outer circle of the water outlet pipe 6.

[0038] Two locking screws 10 are symmetrically arranged on both sides of the upper part of the positioning notch 4. The two locking screws 10 are coaxial and their axis is perpendicular to the axis of the positioning part 2.

[0039] Combination Figure 4 As shown, the usage process of this utility model is as follows:

[0040] 1. Mounting hole 8 at one end of the main body 5 of the vertical car.

[0041] 2. Lift out the volute housing 7, place the positioning fixture on the chuck of the vertical lathe and clamp it. The positioning fixture is positioned on the chuck by a positioning structure (such as the transition plate 1 of the positioning fixture and the chuck using a conical pin for positioning). After the chuck clamps the positioning fixture each time, the axis of the outer positioning surface 9 and the rotation axis of the chuck are on the same axis. If there is no positioning structure between the chuck and the positioning fixture, it is necessary to use a dial indicator to align it according to the outer circle of the bottom of the positioning part 2 (because the outer circle of the bottom of the positioning part 2 is coaxial with the positioning surface 9 and is machined in one clamping, the coaxiality after machining can be guaranteed). Since it is easier to align according to the outer circle than according to the inner hole, and the weight of the positioning fixture is much less than the weight of the volute housing 7, it is easier to align.

[0042] 3. Turn the volute housing 7 over so that the machined mounting hole 8 fits onto the outer positioning surface 9. Tighten the two locking screws 10 to clamp the water outlet pipe 6. At the same time, ensure that the end face of the water outlet pipe 6 is parallel to the outer end face of the positioning plate 3. Then, press the volute housing 7 onto the chuck using the pressure plate.

[0043] 4. Machine the mounting hole 8 at the other end of the main body 5.

[0044] 5. Place the assembled volute housing 7 and positioning fixture flat on the boring machine worktable. Align the fixture with the end face of the positioning plate 3 as the reference. Set the tool according to the center of the positioning notch 4 and bore the outer circle and end face of the water outlet 6. Use a depth vernier to measure the distance e from the outer end face of the water outlet 6 to the outer end face of the positioning plate 3 until e + b = B, and the boring is completed.

[0045] Therefore, when using this invention to process the volute housing 7, the number of alignment steps or the difficulty of alignment can be reduced, and no scribing is required when boring the water outlet pipe 6, thereby improving the processing efficiency of the volute housing 7 and reducing the processing difficulty.

[0046] Example 2

[0047] The difference between this embodiment and Embodiment 1 is that:

[0048] The positioning part 2 includes an annular base plate 12 fixedly connected to the transition plate 1 and a positioning ring 11 fixedly connected to the base plate 12. The axis of the base plate 12 and the axis of the positioning ring 11 are on the same vertical line. The outer positioning surface 9 is located on the outer circle of the positioning ring 11. The upper part of the outer positioning surface 9 is chamfered and forms a conical surface, making it easier for the positioning ring 11 to enter the mounting hole 8, so as to facilitate the cooperation between the mounting hole 8 and the outer positioning surface 9.

[0049] In actual production, the base plate 12, positioning ring 11, transition plate 1 and positioning plate 3 are integrally cast from HT200 cast iron and then machined.

[0050] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A positioning jig for machining the volute casing of a ceramic slurry pump, characterized in that, It includes a positioning part (2), a positioning plate (3), and a transition plate (1) fixedly connected between the positioning part (2) and the positioning plate (3); the outer circle of the positioning part (2) is provided with a circular outer positioning surface (9) for cooperating with the mounting hole (8) on the volute housing (7); the positioning plate (3) is provided with a positioning notch (4) for accommodating the water outlet pipe (6) of the volute housing (7); and a pair of locking screws (10) for clamping the water outlet pipe (6) are threadedly connected to the positioning plate (3).

2. The positioning fixture for machining the volute casing of a ceramic slurry pump according to claim 1, characterized in that, The positioning notch (4) is V-shaped. The symmetrical plane of the positioning notch (4) is parallel to the axis of the positioning part (2). The distance between the axis of the mounting hole (8) and the axis of the water outlet pipe (6) is A. The distance between the symmetrical plane of the positioning notch (4) and the axis of the positioning part (2) is a. Then A = a.

3. The positioning fixture for machining the volute casing of a ceramic slurry pump according to claim 2, characterized in that, The axis of the positioning part (2) is parallel to the positioning plate (3), the distance between the axis of the positioning part (2) and the outer side of the positioning plate (3) is b, and the distance between the end face of the water outlet pipe (6) of the volute housing (7) and the axis of the mounting hole (8) is B, then B > b.

4. A positioning jig for machining the volute casing of a ceramic slurry pump according to claim 3, characterized in that, The diameter of the outer positioning surface (9) is c, and the diameter of the mounting hole (8) is C, then C = c.

5. A positioning fixture for machining the volute casing of a ceramic slurry pump according to claim 1, characterized in that, The positioning part (2) includes an annular base plate (12) fixedly connected to the transition plate (1) and a positioning ring (11) fixedly connected to the base plate (12). The axis of the base plate (12) and the axis of the positioning ring (11) are on the same straight line, which is vertical. The outer positioning surface (9) is located on the outer circle of the positioning ring (11).

6. A positioning jig for machining the volute casing of a ceramic slurry pump according to claim 5, characterized in that, The upper part of the outer positioning surface (9) has a chamfer.

7. A positioning fixture for machining the volute casing of a ceramic slurry pump according to claim 1, characterized in that, Two locking screws (10) are symmetrically arranged on both sides of the positioning notch (4). The two locking screws (10) are coaxial and their axis is perpendicular to the axis of the positioning part (2).

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