Drilling tool for impeller

Abstract

The utility model relates to the technical field of machining, in particular to a drilling tool for an impeller, which comprises a bottom plate, a positioning plate, four small screws, a drill plate and a large screw, the drilling tool is mounted on a worktable of a drilling machine through the bottom plate, a plurality of sets of drilling tools can be placed on the worktable simultaneously, and accurate positioning of the impeller is realized through the positioning plate and a positioning table on the drill plate. Positioning is accurate, assembling and disassembling are convenient, efficiency is high, and mass production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a drilling tool for an impeller. Background Art

[0002] like Figure 1-2 The impeller 100 shown needs to be drilled with two opposite axial through holes, which are located on the outer end face of the impeller at the roots of two opposite blades 103, and the blades 103 are relatively high, so it is not easy to mark and position them here; the hole is on the inner end face of the impeller, corresponding to a very narrow annular boss 105, and the annular boss has a certain slope, which is not convenient for marking and positioning, and the drill bit is also very easy to slip off; at the same time, there is no plane around the impeller 100 for precise positioning, so although the number of holes drilled is not large and the depth is not deep, the northernmost work before drilling takes a long time, which is acceptable for small batch processing, but cannot meet production requirements when the batch is large. Utility Model Content

[0003] The purpose of the utility model is to provide a drilling tool for an impeller to solve the problem of low efficiency of existing impeller drilling. The technical method adopted is:

[0004] A drilling tool for an impeller, comprising

[0005] The bottom plate has four small screw holes arranged in a circular array with its center as the center;

[0006] The center of the positioning plate extends upward to form an upper truncated cone, which can enter the center spline of the impeller and transitionally cooperate with it. Four countersunk small holes are opened on the positioning plate corresponding to the four small screw holes, and a large screw hole is opened in the center of the upper truncated cone;

[0007] 4 small screws, the nail heads are sunk into the countersunk holes, and the screw rods pass through the countersunk holes and are screwed into the small screw holes;

[0008] The drilling template has an edge of the lower end surface and a position corresponding to one of the weight-reducing grooves of the impeller extending downward to form a positioning platform, the contour shape of the positioning platform is the same as the contour shape of the weight-reducing groove, and two drill rod guide holes are opened along the axial direction of the drilling template with the positioning platform as a reference; a circular groove is opened in the middle of the lower end surface to avoid the annular boss of the impeller, and the center of the circular groove extends downward to form a lower circular table, which can enter the center spline of the impeller and transitionally cooperate with it, and a large through hole is opened in the center of the lower circular table;

[0009] The large screw is threadedly connected with the large screw hole after the screw rod passes through the large through hole; the diameter of the nail head of the large screw is larger than the diameter of the large through hole.

[0010] Furthermore, it also includes a pressure plate, which is located between the nail head of the large screw and the upper end surface of the drilling template. The pressure plate is provided with a U-shaped opening open on the side for easy installation on the screw rod of the large screw; the diameter of the large through hole is larger than the diameter of the nail head of the large screw, and the width of the U-shaped opening is smaller than the diameter of the nail head of the large screw.

[0011] Furthermore, through holes for fixing to the drilling machine table are provided at the four corners of the bottom plate.

[0012] Furthermore, the height of the upper cone is greater than the height of the impeller blades and less than the height of the blades plus the height of the center spline.

[0013] Furthermore, the height of the positioning platform is less than or equal to the depth of the weight reduction groove.

[0014] Furthermore, rotating sleeves are respectively embedded at the upper ends of the two drill rod guide holes to prevent the drill rod guide holes from being worn.

[0015] Compared with the prior art, the utility model is installed on the workbench of the drilling machine through the base plate, and multiple sets of drilling tools can be placed on the workbench at the same time. The accurate positioning of the impeller is achieved through the positioning plate and the positioning table on the drilling template. The positioning is accurate, the loading and unloading is convenient, the efficiency is high, and it is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1-2 This is a schematic diagram of the impeller structure after drilling is completed.

[0017] Figure 3 It is a schematic diagram of the structure of the utility model after the impeller is clamped.

[0018] Figure 4 for Figure 3 sectional view of .

[0019] Figure 5-6 for Figure 3 Exploded views of components from different perspectives. DETAILED DESCRIPTION

[0020] The utility model will be further described below in conjunction with the accompanying drawings.

[0021] Embodiment 1, as Figure 1-6 The impeller drilling tool shown includes:

[0022] The bottom plate 1 has four small screw holes 11 arranged in a circular array around its center;

[0023] The center of the positioning plate 2 extends upward to form an upper truncated cone 21, which can enter the central spline 104 of the impeller 100 and transitionally cooperate with it. Four countersunk small holes 22 are opened on the positioning plate 2 corresponding to the four small screw holes 11, and a large screw hole 23 is opened in the center of the upper truncated cone 21;

[0024] Four small screws 7, the nail heads are sunk into the countersunk holes 22 respectively, and the screw rods pass through the countersunk holes 22 and are screwed into the small screw holes 11 respectively;

[0025] The drilling template 3 has a lower end surface edge, which extends downward from the position corresponding to one of the weight-reducing grooves 102 of the impeller 100 to form a positioning platform 34. The contour shape of the positioning platform 34 is the same as the contour shape of the weight-reducing groove 102. Two drill rod guide holes 35 are opened along the axial direction of the drilling template 3 based on the positioning platform 34; a circular groove 31 is opened in the middle of the lower end surface to avoid the annular boss 105 of the impeller 100. The center of the circular groove 31 extends downward to form a lower circular platform 32. The lower circular platform 32 can enter the central spline 104 of the impeller 100 and transitionally cooperate with it. A large through hole 33 is opened in the center of the lower circular platform 32;

[0026] The large screw 6 passes through the large through hole 33 and is screwed to the large screw hole 23 ; the diameter of the nail head of the large screw 6 is larger than the diameter of the large through hole 33 .

[0027] In this embodiment, through holes 12 for fixing to the workbench of the drilling machine are provided at the four corners of the bottom plate 1 .

[0028] In this embodiment, the height of the upper truncated cone 21 is greater than the height of the blades 103 of the impeller 100 and less than the height of the blades 103 plus the height of the center spline 104 .

[0029] In this embodiment, the height of the positioning platform 34 is less than or equal to the depth of the lightening groove 102 .

[0030] In another preferred embodiment, a rotating sleeve 4 is respectively embedded at the upper ends of the two drill rod guide holes 35 to prevent the drill rod guide holes 35 from being worn.

[0031] When in use, it is installed on the workbench of the drilling machine through the base plate. Multiple sets of drilling tools can be placed on the workbench at the same time. The impeller is accurately positioned through the positioning plate and the positioning table on the drilling template. It has accurate positioning, convenient loading and unloading, high efficiency, and is suitable for mass production.

[0032] Embodiment 2 is different from Embodiment 1 in that it further includes a pressing plate 5, which is located between the nail head of the large screw 6 and the upper end surface of the drilling template 3. The pressing plate 5 is provided with a U-shaped opening which is convenient for being put on the screw rod of the large screw 6 and is open on the side. The diameter of the large through hole 33 is larger than the diameter of the nail head of the large screw 6, and the width of the U-shaped opening is smaller than the diameter of the nail head of the large screw 6. In this way, after the previous impeller is drilled, the large screw 6 is slightly loosened, and the pressing plate 5 can be removed from the screw rod of the large screw 6, and then the drilling template 3 can be lifted up to be separated from the large screw 6, so that the new impeller 100 can be conveniently placed on the positioning plate 2, and then the drilling template 3 is placed on the new impeller 100, and then the pressing plate 5 is inserted, and finally the large screw is tightened. This can further improve efficiency.

Claims

1. A drilling tool for an impeller, characterized in that: include The bottom plate (1) has four small screw holes (11) arranged in a circular array with its center as the center; The center of the positioning plate (2) extends upward to form an upper truncated cone (21), the upper truncated cone (21) can enter the center spline (104) of the impeller (100) and transitionally fit therewith, four countersunk small holes (22) are formed on the positioning plate (2) corresponding to the four small screw holes (11), and a large screw hole (23) is formed in the center of the upper truncated cone (21); Four small screws (7), the heads of which are respectively sunk into the countersunk small holes (22), and the screw rods respectively pass through the countersunk small holes (22) and are screwed into the small screw holes (11); The drilling template (3) has an edge of a lower end surface, corresponding to a position of one of the weight-reducing grooves (102) of the impeller (100), extending downward to form a positioning platform (34); the contour shape of the positioning platform (34) is the same as the contour shape of the weight-reducing groove (102); two drill rod guide holes (35) are provided along the axial direction of the drilling template (3) with the positioning platform (34) as a reference; a circular groove (31) is provided in the middle of the lower end surface to avoid the annular boss (105) of the impeller (100); the center of the circular groove (31) extends downward to form a lower truncated platform (32); the lower truncated platform (32) can enter the center spline (104) of the impeller (100) and transitionally cooperate with it; a large through hole (33) is provided in the center of the lower truncated platform (32); The large screw (6) is threadedly connected to the large screw hole (23) after the screw rod passes through the large through hole (33); the diameter of the nail head of the large screw (6) is larger than the diameter of the large through hole (33).

2. The impeller drilling tool according to claim 1, characterized in that: It also includes a pressing plate (5) located between the nail head of the large screw (6) and the upper end surface of the drilling template (3), and the pressing plate (5) is provided with a U-shaped opening which is convenient for being sleeved on the screw rod of the large screw (6) and is open at the side; the diameter of the large through hole (33) is larger than the diameter of the nail head of the large screw (6), and the width of the U-shaped opening is smaller than the diameter of the nail head of the large screw (6).

3. The impeller drilling tool according to claim 1, characterized in that: Through holes (12) for fixing to a workbench of a drilling machine are provided at four corners of the bottom plate (1).

4. The impeller drilling tool according to claim 1, characterized in that: The height of the upper truncated cone (21) is greater than the height of the blades (103) of the impeller (100) and less than the height of the blades (103) plus the height of the center spline (104).

5. The impeller drilling tool according to claim 1, characterized in that: The height of the positioning platform (34) is less than or equal to the depth of the weight-reducing groove (102).

6. The impeller drilling tool according to claim 1, characterized in that: The upper ends of the two drill rod guide holes (35) are respectively embedded with rotating sleeves (4) to prevent the drill rod guide holes (35) from being worn.

Images