A knife holder positioning jig

Abstract

The utility model discloses a kind of knife holder positioning fixture, it is related to machining technical field, solve the problem that existing clamping mode is used to knife holder and exists clamping step is complicated, is easily clamped and broken.This positioning fixture includes: jig plate, the front end of jig plate is concave and formed with positioning platform, first limit slot is opened in jig plate, first limit slot extends to the position where positioning platform is along the length direction of jig plate, the shape of first limit slot is compatible with the appearance of the knife holder to be processed, the middle region of positioning platform is convex and formed with the positioning part of the shape and position compatible with the recess on the knife holder to be processed;At least one clamping block, the bottom of clamping block is formed with the second limit slot compatible with the appearance of the knife holder to be processed.The positioning fixture has the advantages of simple structure, easy clamping, etc., two ends of knife holder can be processed simultaneously by once clamping, reduce the time of clamping, improve processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a tool holder positioning fixture. Background Technology

[0002] The cutter holder on the rotary pressure plate is a core component in many crushing and grinding equipment. The cutter holder is typically directly connected to the main shaft of the equipment via a keyway or flange. The rotation of the main shaft drives the cutter holder to rotate, which in turn drives all the blades mounted on it to rotate synchronously, forming an effective cutting zone. When cutting and crushing materials, the blades are subjected to enormous reverse forces (torque). The cutter holder itself must possess extremely high strength and rigidity to withstand and transmit these torques without deformation.

[0003] like Figure 1 The tool holder shown consists of three cylindrical parts, each with a different diameter. The cylinder in the middle section has the smallest diameter, followed by the cylinder with the keyway, and the cylinder at the front end of the tool holder has the largest diameter; this area is also used to mount the cutting tool. During machining, the cylinders at both ends of the tool holder need to be milled. Current technology typically uses a jaw chuck to clamp the tool holder twice, machining each end separately. This clamping method is prone to damaging the tool holder, and the jaws can leave marks on the surface, affecting the product's surface quality. Furthermore, the need for two clamping operations reduces machining efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems by designing a tool holder positioning fixture, which solves the problems of cumbersome clamping steps and easy damage when using the existing clamping method for the tool holder.

[0005] The technical solution of this utility model to achieve the above objectives is a knife holder positioning fixture, comprising: A fixture plate has a downwardly recessed front end forming a positioning platform. A first limiting groove is provided on the fixture plate, extending along the length of the fixture plate to the location of the positioning platform. The shape of the first limiting groove is adapted to the shape of the tool holder to be processed. The middle area of ​​the positioning platform protrudes upward to form a positioning part whose shape and position are adapted to the groove on the tool holder to be processed. The positioning part and the first limiting groove are located on the same axis of symmetry. At least one clamping block, the bottom of which has a second limiting groove that is adapted to the shape of the tool holder to be processed, the clamping block being fixedly mounted on the fixture plate by bolts and capable of clamping the tool holder to be processed.

[0006] Preferably, the positioning fixture has at least one first bolt hole on each side of the first limiting groove, and the clamping block has a second bolt hole at each corresponding end. A fastening bolt is provided in the second bolt hole, and the fastening bolt passes through the second bolt hole and is threadedly connected to the first bolt hole.

[0007] Preferably, the fastening bolt and the second bolt hole are in clearance fit.

[0008] Preferably, the thickness of the positioning part does not exceed the depth of the corresponding groove on the tool holder.

[0009] Preferably, the depth of the first limiting groove and the second limiting groove does not exceed the radius of the corresponding part of the tool holder to be processed.

[0010] Preferably, at least one third bolt hole is provided in the first limiting groove, a bolt is provided in the third bolt hole, and a countersunk hole is provided on the upper side of the third bolt hole.

[0011] Preferably, the length of the first limiting groove does not exceed the length of the corresponding clamping area on the tool holder.

[0012] Its advantages over existing technologies are: The positioning fixture of this invention has the advantages of simple structure and easy clamping. After the tool holder is placed on the fixture plate, the middle part of the tool holder is embedded into the first limiting groove, and then the tool holder is clamped and fixed on the fixture by the clamping block. At the same time, the positioning part on the positioning platform is embedded into the keyway at the rear end of the tool holder, which can prevent the tool holder from rotating during machining. Both ends of the tool holder can be machined at the same time in one clamping, reducing clamping time and improving machining efficiency.

[0013] The positioning platform, positioning part, and first limiting groove on the fixture plate can provide stable support for the tool holder and prevent instability during machining. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the knife holder structure; Figure 2 This is a schematic diagram of the fixture plate in the positioning fixture; Figure 3 This is a schematic diagram of the clamping block in the positioning fixture; Figure 4 This is a schematic diagram of the positioning fixture when the tool holder is being installed; Figure 5 This is a schematic diagram of the positioning fixture in other implementation schemes when clamping the tool holder.

[0015] In the figure, 1 is the jig plate; 101 is the positioning platform; 102 is the positioning part; 103 is the first limiting groove; 104 is the first bolt hole; 105 is the third bolt hole; 106 is the countersunk hole; 2 is the clamping block; 201 is the second limiting groove; 202 is the second bolt hole; 3 is the fastening bolt; 4 is the tool holder; 401 is the first cylinder; 402 is the second cylinder; 403 is the third cylinder. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] like Figure 4 As shown, a preferred embodiment of this utility model provides a knife holder positioning fixture, which mainly includes a fixture plate 1 and a clamping block 2. The clamping block 2 clamps and fixes the cylindrical part of the middle region of the knife holder 4 onto the fixture plate 1.

[0018] For ease of description, the tool holder 4 is disassembled into three parts, from front end to rear end: first cylinder 401, second cylinder 402 and third cylinder 403. The third cylinder 403 has a groove, which is the keyway.

[0019] For details, see Figure 2 One end of the upper surface of the fixture plate 1 is recessed downward to form a positioning platform 101, which is used to support the third cylinder 403 of the tool holder 4. The positioning platform 101 is open around its perimeter to facilitate machining of the third cylinder 403 of the tool holder 4, while the first cylinder 401 of the tool holder 4 is also exposed outside the fixture plate 1 to facilitate machining of the first cylinder 401.

[0020] A first limiting groove 103 is formed on the upper surface of the jig plate 1. The first limiting groove 103 extends along the length of the jig plate 1 from the end of the jig plate 1 away from the positioning platform 101 to the position of the positioning platform 101. In this embodiment, the cross-sectional shape of the first limiting groove 103 is preferably semi-circular, and its diameter is consistent with the diameter of the second cylinder 402 of the knife holder 4. Correspondingly, a second limiting groove 201 is formed at the bottom of the clamping block 2. The cross-sectional shape of the second limiting groove 201 is also preferably semi-circular, and its diameter is consistent with the diameter of the second cylinder 402 of the knife holder 4.

[0021] like Figure 4As shown, the clamping block 2 and the fixture plate 1 are tightly clamped together, clamping the second cylinder 402 of the tool holder 4. Since the diameters of the first limiting groove 103 and the second limiting groove 201 are the same as the diameter of the second cylinder 402, the clamping block 2 will be in close contact with the upper surface of the fixture plate 1 after clamping the second cylinder 402.

[0022] See Figure 5 In other embodiments, the cross-sectional shape of the first limiting groove 103 and the second limiting groove 201 may not be semi-circular. The arc of the first limiting groove 103 and the second limiting groove 201 may be one-third or one-quarter of the circumference of the second cylinder 402 of the tool holder 4. In this way, when the clamping block 2 clamps the second cylinder 402, the clamping block 2 will not contact the upper surface of the fixture plate 1. Therefore, long bolts are needed to fix the clamping block 2 to the fixture plate 1.

[0023] like Figure 2 As shown, a positioning part 102 is formed by an upward protrusion in the middle area of ​​the positioning platform 101. The positioning part 102 is square and matches the shape of the keyway on the third cylinder 403 of the tool holder 4. The positioning part 102 and the first limiting groove 103 are located on the same central axis, and both the first limiting groove 103 and the positioning part 102 are symmetrical structures.

[0024] In this embodiment, the height (i.e., thickness) of the positioning part 102 generally does not exceed the depth of the keyway. Preferably, the thickness of the positioning part 102 is consistent with the depth of the keyway. When the tool holder 4 is placed on the fixture plate 1, the second cylinder 402 is embedded in the first limiting groove 103, while the third cylinder 403 is supported on the positioning platform 101, and the positioning part 102 is embedded in the keyway. The positioning part 102 can provide support for the tool holder 4 and prevent the tool holder 4 from rotating during processing.

[0025] The edges of the positioning part 102 are all rounded to prevent scratching the inner wall of the keyway.

[0026] The height of the positioning platform 101 is lower than that of the first limiting groove 103, so there is a certain height difference between the two, so as to match the diameter difference between the second cylinder 402 and the third cylinder 403 of the tool holder 4. In this way, the third cylinder 403 of the tool holder 4 can be supported by the positioning platform 101, and the second cylinder 402 can be supported by the first limiting groove 103, resulting in better support.

[0027] In other embodiments, the thickness of the positioning part 102 can be slightly less than the depth of the keyway, and the height of the positioning platform 101 should be lower than the first limiting groove 103. This way, the third cylinder 403 of the tool holder 4 will not contact the positioning platform 101, and the positioning platform 101 will no longer support the third cylinder 403. Correspondingly, the positioning part 102 will also not contact the bottom of the keyway, and the positioning part 102 will no longer support the third cylinder 403. In this case, the positioning part 102 only serves to prevent the tool holder 4 from rotating.

[0028] See 2. Figure 4 The length of the first limiting groove 103 does not exceed the axial length of the second cylinder 402 of the tool holder 4, preferably the length of the first limiting groove 103 is consistent with the axial length of the second cylinder 402 of the tool holder 4. In this way, after the tool holder 4 is placed on the fixture plate 1, the second cylinder 402 is embedded in the first limiting groove 103, and the opposite end faces of the first cylinder 401 and the second cylinder 402 will respectively contact the two ends of the first limiting groove 103 on the fixture plate 1, which can position the tool holder 4 axially and prevent its axial movement.

[0029] A bolt hole, namely a first bolt hole 104, is provided on each side of the first limiting groove 103 on the fixture plate 1. The first bolt hole 104 can be a blind hole or a through hole. The first bolt hole 104 has an internal thread.

[0030] Correspondingly, see Figure 3 Each end of the clamping block 2 has a bolt hole, namely the second bolt hole 202. These two bolt holes are through holes, and their inner surfaces may or may not be threaded. The fastening bolt 3 passes through the second bolt hole 202 and is threaded into the first bolt hole 104, thereby fixing the clamping block 2 onto the fixture plate 1. Finally, the clamping block 2 and the fixture plate 1 clamp the second cylinder 402 of the tool holder 4.

[0031] The fastening bolt 3 and the second bolt on the clamping block 2 are clearance fit to adjust the position of the clamping block 2.

[0032] The number of clamping blocks 2 can be one, two, three, etc., and the specific number is determined by the axial length of the second cylinder 402 of the tool holder 4.

[0033] See Figure 2 To facilitate fixing the jig plate 1 to the platform plate of the machine tool, at least one bolt hole, namely the third bolt hole 105, is provided in the jig plate 1 within the first limiting groove 103. A countersunk hole 106 is provided above the third bolt hole 105 to conceal the bolt cap.

[0034] The third bolt hole 105 is a through hole. Threads may or may not be provided in the third bolt hole 105. The bolt passes through the third bolt hole 105 and is then threadedly connected to the platform plate on the machine tool, thereby fixing the positioning fixture onto the platform plate.

[0035] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A knife holder positioning fixture, characterized in that, include: A fixture plate (1) has a downward recessed front end forming a positioning platform (101). A first limiting groove (103) is provided on the fixture plate (1). The first limiting groove (103) extends along the length of the fixture plate (1) to the position of the positioning platform (101). The shape of the first limiting groove (103) is adapted to the shape of the tool holder (4) to be processed. The middle area of ​​the positioning platform (101) protrudes upward to form a positioning part (102) whose shape and position are adapted to the groove on the tool holder (4) to be processed. The positioning part (102) and the first limiting groove (103) are located on the same axis of symmetry. At least one clamping block (2) has a second limiting groove (201) at its bottom that is adapted to the shape of the tool holder (4) to be processed. The clamping block (2) is fixedly mounted on the fixture plate (1) by bolts and can clamp the tool holder (4) to be processed.

2. The tool holder positioning fixture according to claim 1, characterized in that, The positioning fixture has at least one first bolt hole (104) on each side of the first limiting groove (103), and the clamping block (2) has a second bolt hole (202) at each of its corresponding ends. A fastening bolt (3) is provided in the second bolt hole (202), and the fastening bolt (3) passes through the second bolt hole (202) and is threadedly connected to the first bolt hole (104).

3. The tool holder positioning fixture according to claim 2, characterized in that, The fastening bolt (3) and the second bolt hole (202) are clearance fit.

4. The tool holder positioning fixture according to claim 1, characterized in that, The thickness of the positioning part (102) does not exceed the depth of the corresponding groove on the tool holder (4).

5. The tool holder positioning fixture according to claim 1, characterized in that, The depth of the first limiting groove (103) and the second limiting groove (201) does not exceed the radius of the corresponding part of the tool holder (4) to be processed.

6. The tool holder positioning fixture according to claim 1, characterized in that, At least one third bolt hole (105) is provided in the first limiting groove (103), a bolt is provided in the third bolt hole (105), and a countersunk hole (106) is provided on the upper side of the third bolt hole (105).

7. The tool holder positioning fixture according to claim 1, characterized in that, The length of the first limiting groove (103) does not exceed the length of the corresponding clamping area on the tool holder (4).

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