Positioning clamp for grinding ejector pin

Abstract

The utility model relates to a positioning fixture for grinding an ejector pin, which is applied to the technical field of ejector pin processing and fixing, solves the problems that when the existing fixture for fixing and positioning the ejector pin is ground, the structure is complicated, the assembly and disassembly of the ejector pin are inconvenient, and the operation is tedious, and comprises a support base, the supporting base is used for placing a thimble to be ground; the fixing plate is arranged above the supporting base, and a limiting hole allowing the top end of the ejector pin to penetrate through is formed in the fixing plate; the height adjusting piece is arranged between the supporting base and the fixing plate and used for adjusting the longitudinal height of the fixing plate; the ejector pin clamp has the effects that the ejector pin to be ground can be fixed through the ejector pin clamp, a grinding machine can conveniently grind the ejector pin, and operation is fast and convenient.

Description

Technical Field

[0001] The utility model is applied to the technical field of thimble processing and fixing, in particular to a positioning fixture for thimble grinding. Background Art

[0002] When using a mold for injection molding, after the injection molded part is formed, due to reasons such as shape, the injection molded part cannot fall off automatically and remains in the cavity. For this reason, a set of ejection mechanisms will be designed in the mold to eject the injection molded part from the cavity to facilitate the removal of the plastic part.

[0003] Usually, the ejector mechanism includes an ejector rod and a plurality of ejector pins arranged on the ejector rod. When the ejector plate moves, the plurality of ejector pins on the ejector plate move synchronously, and the ejector pins extend into the cavity to eject the injection molded part. Due to the different shapes of the injection molded parts, ejector pins of different shapes are required.

[0004] Usually, dome pins are sold on the market, and the factory specifications of dome pins are certain. In order to meet the actual application requirements, the existing dome pins need to be cut and ground to the required height. During grinding, the dome pins need to be positioned and fixed so that the length of the ground section is determined. When grinding the dome pins, the existing fixtures for fixing and positioning the dome pins are complex in structure, which is inconvenient to install and disassemble the dome pins, and the operation is cumbersome. Utility Model Content

[0005] The utility model aims to provide a positioning fixture for grinding an ejector pin, which solves the problems that the existing fixture for fixing and positioning the ejector pin is complex in structure, inconvenient to install and disassemble the ejector pin, and complicated in operation when the ejector pin is ground.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides a positioning fixture for thimble grinding, comprising:

[0008] A support base, the support base is used to place the ejector pin to be ground;

[0009] A fixing plate, the fixing plate is arranged above the supporting base and is provided with a limiting hole for the top end of the ejector pin to pass through;

[0010] A height adjusting member is disposed between the support base and the fixing plate, and is used to adjust the longitudinal height of the fixing plate.

[0011] Furthermore, the fixing plate includes a pin pressure plate and a limiting plate detachably connected to both sides of the pin pressure plate in the length direction, the limiting holes are provided on both side edges of the pin pressure plate in the length direction, and one side of the limiting hole extends along its radial direction to the side surface of the pin pressure plate in the length direction.

[0012] Furthermore, the transverse cross section of the limiting hole is arranged in a sawtooth shape.

[0013] Furthermore, there are multiple limiting holes on each side of the ejector pressing plate.

[0014] Furthermore, the longitudinal width of each of the limiting holes is different.

[0015] Furthermore, the height adjustment member includes a connecting plate vertically arranged on the supporting base, a movable plate slidably connected to the connecting plate and a locking member for fixing the movable plate, and the top end of the movable plate is connected to the lower end surface of the fixed plate.

[0016] Furthermore, a guide groove is provided on one side of the connecting plate, and a guide convex strip cooperating with the guide groove is provided on the movable plate.

[0017] Furthermore, the guide groove is arranged in a dovetail shape, and the shape of the guide ridge is adapted to the shape of the guide groove.

[0018] Furthermore, the locking member includes a waist-shaped hole longitudinally arranged on the connecting plate, a locking screw and a threaded hole arranged on the movable plate and cooperating with the locking screw. A step surface is arranged on the inner wall of the waist-shaped hole along its circumference, and the transverse part of the locking screw is pressed against the step surface. The main body of the locking screw passes through the waist-shaped hole and is threadedly connected in the threaded hole.

[0019] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0020] The utility model discloses a positioning fixture for grinding an ejector pin. The ejector pin positioning fixture has a simple structure, is convenient for processing and manufacturing, and has a low cost. The ejector pin to be ground can be fixed by the ejector pin fixture, which is convenient for the grinding bed to grind the ejector pin, and is convenient for installation and disassembly of the ejector pin, and the operation is quick.

[0021] Furthermore, there are multiple limiting holes on each side of the ejector pressing plate, and the longitudinal width of each limiting hole is different, so that the clamp can fix ejectors of different diameters, thereby improving the utilization rate of the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of placing the ejector fixture on the grinding bed in the preferred embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the ejector clamp in the preferred embodiment of the utility model;

[0025] Figure 3 is a transverse cross-sectional view of the ejector fixture in the preferred embodiment of the utility model;

[0026] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0027] Figure 5 It is a longitudinal sectional view of the ejector clamp in the preferred embodiment of the utility model.

[0028] The reference numerals are described as follows:

[0029] 1. Magnetic chuck; 2. Grinding wheel; 3. Ejector; 4. Support base; 5. Fixed plate; 51. Ejector pressure plate; 52. Limit plate; 6. Limit hole; 7. Height adjustment piece; 71. Connecting plate; 72. Movable plate; 8. Locking piece; 81. Waist hole; 82. Locking screw; 83. Threaded hole; 84. Step surface; 9. Guide groove; 10. Guide convex strip. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] refer to Figure 1 , which is a positioning fixture for thimble grinding provided by the utility model, and is used in conjunction with a grinder. After the thimble to be ground is installed in the positioning fixture, the bottom end of the positioning fixture is adsorbed on the magnetic chuck 1 of the grinder, and then the top of the thimble 3 is ground by adjusting the grinding feed amount of the grinding wheel 2 of the grinder, thereby processing the thimble 3 that meets the actual height. Specifically, the positioning fixture includes:

[0034] refer to Figure 2 , Figure 3 and Figure 4 , a support base 4, the support base 4 is used to place the ejector pin 3 to be ground, that is, the ejector pin 3 to be ground is vertically placed on the support base 4;

[0035] The fixing plate 5 is arranged above the supporting base 4 and is provided with a limiting hole 6 for the top end of the ejector pin 3 to pass through; the vertically placed ejector pin 3 is fixed under the action of the limiting hole 6.

[0036] The fixing plate 5 includes an ejector plate 51 and a limiting plate 52 detachably connected to both sides of the ejector plate 51 in the length direction. The limiting plate 52 can be fixed to the side of the ejector plate 51 by bolts. The edges of both sides of the ejector plate 51 in the length direction are provided with limiting holes 6. One side of the limiting hole 6 extends to the side of the ejector plate 51 in the length direction along its radial direction. Specifically, the transverse cross section of the limiting hole 6 is serrated. By arranging the limiting hole 6 in a serrated shape, when the ejector 3 is limited and fixed by the limiting plate 52 and the limiting hole 6, the ejector 3 and the limiting hole 6 are in point-to-point contact, that is, three-point contact, which reduces the contact area between the ejector 3 and the limiting hole 6, protects the outer cylindrical surface of the ejector 3, and avoids wear of the outer cylindrical surface of the ejector 3. Of course, the transverse cross section of the limiting hole 6 can also be rectangular or circular.

[0037] refer to Figure 2-Figure 5, height adjustment member 7, which is arranged between the support base 1 and the fixed plate 5, and is used to adjust the longitudinal height of the fixed plate 5. The height of the fixed plate 5 can be adjusted by the height adjustment member 7 according to the length of different ejector pins 3. Specifically, the height adjustment member 7 includes a connecting plate 71 vertically arranged on the support base 4, a movable plate 72 slidably connected to the connecting plate 71, and a locking member 8 for fixing the movable plate 72, and the top of the movable plate 72 is connected to the lower end surface of the fixed plate 5. A guide groove 9 is arranged on one side of the connecting plate 71, and a guide ridge 10 that cooperates with the guide groove 9 is arranged on the movable plate 72. The guide groove 9 is arranged in a dovetail shape, and the shape of the guide ridge 10 is adapted to the shape of the guide groove 9. The cooperation between the dovetail guide groove 9 and the dovetail guide ridge 10 plays a guiding role when the movable plate 72 moves longitudinally, thereby improving the stability during longitudinal movement.

[0038] refer to Figure 2 , Figure 3 and Figure 4 The locking member 8 includes a waist-shaped hole 81 longitudinally arranged on the connecting plate, a locking screw 82 and a threaded hole 83 arranged on the movable plate 72 and cooperating with the locking screw 82. The threaded hole 83 can be arranged on the guide ridge 10. A step surface 84 is arranged on the inner wall of the waist-shaped hole 81 along its circumference. The transverse part of the locking screw 82 is pressed against the step surface 84. The main body of the locking screw 82 passes through the waist-shaped hole 81 and is threadedly connected in the threaded hole 83.

[0039] refer to Figure 2 and Figure 3 There are multiple limiting holes 6 on each side of the ejector pressing plate 51. By setting multiple limiting holes 6, multiple ejector pins 3 can be fixed at the same time, so that multiple ejector pins 3 can be polished and the grinding efficiency is improved. The longitudinal width of each limiting hole 6 is different, so that the fixture can fix ejector pins 3 of different diameters, thereby improving the utilization rate of the fixture.

[0040] In summary, when the ejector pin 3 is ground on a grinding machine, the ejector pin to be ground can be fixed by the ejector pin fixture, which facilitates the grinding of the ejector pin by the grinding machine, and facilitates the installation and removal of the ejector pin, and the operation is quick.

[0041] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A positioning fixture for thimble grinding, characterized in that: include: A support base (4), the support base (4) being used to place the ejector pin (3) to be ground; A fixing plate (5), the fixing plate (5) being arranged above the supporting base (4) and having a limiting hole (6) for the top end of the ejector pin (3) to pass through; A height adjustment member (7), wherein the height adjustment member (7) is arranged between the support base (4) and the fixing plate (5), and is used to adjust the longitudinal height of the fixing plate (5).

2. The positioning fixture for ejector pin grinding according to claim 1, characterized in that: The fixing plate (5) comprises an ejector pressing plate (51) and limiting plates (52) detachably connected to both sides of the ejector pressing plate (51) in the length direction, and both side edges of the ejector pressing plate (51) in the length direction are provided with limiting holes (6), and one side of the limiting hole (6) extends along its radial direction to the side surface of the ejector pressing plate (51) in the length direction.

3. The positioning fixture for ejector pin grinding according to claim 2, characterized in that: The transverse cross section of the limiting hole (6) is arranged in a sawtooth shape.

4. The positioning fixture for ejector pin grinding according to claim 2, characterized in that: The number of the limiting holes (6) on each side of the ejector pressing plate (51) is multiple.

5. The positioning fixture for ejector pin grinding according to claim 4, characterized in that: The longitudinal width of each of the limiting holes (6) is different.

6. The positioning fixture for ejector pin grinding according to claim 1 or 5, characterized in that: The height adjustment member (7) comprises a connecting plate (71) vertically arranged on the supporting base (4), a movable plate (72) slidably connected to the connecting plate (71), and a locking member (8) for fixing the movable plate (72), wherein the top end of the movable plate (72) is connected to the lower end surface of the fixed plate (5).

7. The positioning fixture for ejector pin grinding according to claim 6, characterized in that: A guide groove (9) is provided on one side of the connecting plate (71), and a guide convex strip (10) cooperating with the guide groove (9) is provided on the movable plate (72).

8. The positioning fixture for ejector pin grinding according to claim 7, characterized in that: The guide groove (9) is arranged in a dovetail shape, and the shape of the guide ridge (10) is adapted to the shape of the guide groove (9).

9. The positioning fixture for ejector pin grinding according to claim 7 or 8, characterized in that: The locking member (8) comprises a waist-shaped hole (81) longitudinally arranged on the connecting plate, a locking screw (82) and a threaded hole (83) arranged on the movable plate (72) and cooperating with the locking screw (82); a step surface (84) is arranged on the inner wall of the waist-shaped hole (81) along its circumference, a transverse portion of the locking screw (82) is pressed against the step surface (84), and a main body of the locking screw (82) passes through the waist-shaped hole (81) and is threadedly connected in the threaded hole (83).

Images