A clamping mechanism for a meat grinder screw

Abstract

The utility model relates to a clamping mechanism, concretely relates to a clamping mechanism of meat grinder spiral twisting axle. The clamping mechanism includes main shaft, three jaw chuck, clamping plate and locating screw rod, and one end head of main shaft is fixed with three jaw chuck, and three jaw chuck is uniformly distributed with clamping plate, and the other end of main shaft is inserted with locating screw rod. The clamping mechanism can clamp the spiral part of spiral twisting axle through clamping plate, makes the position of clamping close to processing position, can effectively reduce the error caused by deviation, while clamping plate is adapted to spiral twisting axle, further reduces the clamping error of spiral twisting axle, and simultaneously ensures the clamping of spiral twisting axle. Through positioning, the end head of spiral twisting axle can be turned under the fixed turning amount, and repeated measurement and calculation are not needed, effectively reduces the labor intensity and improves the work efficiency. The problem of big processing error, big labor intensity and low processing efficiency of the existing processing mode is solved.

Description

Technical Field

[0001] This utility model relates to a clamping mechanism, specifically a clamping mechanism for a meat grinder screw shaft. Background Technology

[0002] A small household meat grinder includes a housing, a auger shaft, and a handwheel (or motor). The auger shaft is conical on the outside, and its diameter gradually increases from one end to the other. The taper of the outer edge of the auger shaft is 2-8 degrees (see [link]). Figure 1 The screw shaft is formed by casting. Due to the presence of sprue (excess casting material at the mold gate) during the casting process, the screw shaft needs to be machined after casting to remove the sprue. Because the screw shaft has a taper, current machining involves using a three-jaw chuck on a lathe to hold one end of the screw shaft and then machining the sprue at the other end. Since the screw shaft is of a certain length (greater than 20cm), even a small clamping offset can cause significant errors when machining only the end. Furthermore, the machining allowance needs to be pre-measured and calculated to ensure complete removal of the sprue without damaging the screw shaft. This measurement and calculation process is not only cumbersome and labor-intensive but also significantly impacts processing efficiency. Therefore, a clamping mechanism for the screw shaft of a meat grinder needs to be designed to solve these problems. Summary of the Invention

[0003] The purpose of this utility model is to provide a clamping mechanism for the spiral shaft of a meat grinder that can process normally, is not prone to errors, and can effectively reduce labor intensity and improve work efficiency.

[0004] The technical solution of this utility model is:

[0005] A clamping mechanism for a meat grinder spiral shaft comprises a lathe spindle, a three-jaw chuck, clamping plates, and a positioning screw. The spindle is cylindrical, and a three-jaw chuck is fixedly mounted at one end of the spindle. The three-jaw chuck is characterized by having clamping plates evenly distributed in a ring on its surface. A positioning screw is inserted at the other end of the spindle, with the end of the positioning screw extending through the three-jaw chuck and between the clamping plates.

[0006] The clamp plate has an arc-shaped cross-section, and the radius of the arc surface of the inner wall of the clamp plate gradually decreases from the outer end of the clamp plate to the clamp plate end on the three-jaw chuck side.

[0007] The positioning screw end is fitted with a positioning sleeve, which is cup-shaped and is fixedly connected to the main shaft by a set screw; adjusting nuts A are provided on the positioning screws on both sides of the positioning sleeve.

[0008] A cylindrical straightening block is provided inside the main shaft on one side of the three-jaw chuck, and the straightening block is connected to the positioning screw; adjusting nuts B are provided on the positioning screws on both sides of the straightening block.

[0009] The three-jaw chuck includes a chuck body, a lead screw, a lead screw nut, a synchronizing gear, and jaws, which are welded to the clamping plate.

[0010] The beneficial effects of this utility model are as follows:

[0011] The clamping mechanism of this meat grinder's spiral shaft can clamp the spiral portion of the shaft using clamping plates, ensuring the clamping position is close to the processing position and effectively reducing errors caused by offset. Simultaneously, the clamping plates are adapted to the spiral shaft, further reducing clamping errors and ensuring a tight grip. The positioning screw positions the spiral shaft, allowing for the machining of the shaft end head with a fixed machining allowance, eliminating the need for repeated measurements and calculations, effectively reducing labor intensity and improving work efficiency. This solves the problems of large machining errors, high labor intensity, and low processing efficiency inherent in existing processing methods. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the spiral shaft structure;

[0013] Figure 2 This is a schematic diagram of the structure of this utility model;

[0014] Figure 3 This is a schematic diagram showing the distribution of the clamping plates of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the clamping plate of this utility model;

[0016] Figure 5 This is an assembly diagram of the positioning screw of this utility model;

[0017] Figure 6 This is a schematic diagram of the structure of the three-jaw chuck of this utility model;

[0018] Figure 7 This is an internal schematic diagram of the three-jaw chuck of this utility model.

[0019] In the diagram: 1. Main spindle, 2. Three-jaw chuck, 3. Clamping plate, 4. Positioning screw, 5. Positioning sleeve, 6. Set screw, 7. Adjusting nut A, 8. Straightening block, 9. Adjusting nut B, 201. Chuck body, 202. Lead screw, 203. Lead screw nut, 204. Synchronizing gear, 205. Jaw. Detailed Implementation

[0020] The clamping mechanism of the spiral shaft of this meat grinder consists of a lathe spindle 1, a three-jaw chuck 2, clamping plates 3, and a positioning screw 4. The spindle 1 is cylindrical, and a three-jaw chuck 2 is fixedly mounted on one end of the spindle 1. Clamping plates 3 are evenly distributed in a ring on the three-jaw chuck 2 to clamp and fix the spiral shaft. The clamping plates 3 expand the clamping range of the three-jaw chuck 2, allowing the three-jaw chuck 2 to clamp the entire position of the spiral shaft from the rear end to the front end, thereby shortening the distance between the machining position and the clamping position of the spiral shaft, reducing errors caused by clamping offset, and making the machining more accurate. At the same time, the expanded clamping range effectively enhances the stability of the spiral shaft clamping, further ensuring the machining quality. A positioning screw 4 is inserted at the other end of the spindle 1, and the end of the positioning screw 4 extends through the three-jaw chuck 2 and between the clamping plates 3. The function of the positioning screw 4 is to position the end of the spiral shaft. By positioning the spiral shaft and setting the machining position, the water head of the spiral shaft of the same specification can be removed by turning without measurement and calculation. This effectively simplifies the process, improves work efficiency, and reduces the labor intensity caused by measurement and calculation.

[0021] The cross-section of the clamping plate 3 is arc-shaped, and the radius of the inner wall arc surface of the clamping plate 3 gradually decreases from the outer end of the clamping plate 3 towards the end of the clamping plate 3 on the side of the three-jaw chuck 2, so that the clamping plate 3 can adapt to the taper of the spiral shaft. By adapting the shape of the clamping plate 3 to the spiral shaft, the pressure between the clamping plate 3 and the spiral shaft is reduced, thereby protecting the spiral shaft and further enhancing the stability of clamping. At the same time, by adapting the clamping plate 3 to the spiral shaft, the spiral shaft is less likely to deviate, further improving the machining accuracy.

[0022] A positioning sleeve 5, cup-shaped, is fitted onto the end of the positioning screw 4. The positioning sleeve 5 is fixedly connected to the spindle 1 via a set screw 6. Adjusting nuts A7 are provided on the positioning screws 4 on both sides of the positioning sleeve 5. The set screw 6 secures the positioning sleeve 5, thereby fixing the position of the positioning screw 4. The adjusting nut A7 adjusts the relative position of the positioning screw 4 and the positioning sleeve 5, thus adjusting the position of the positioning screw 4. This adjustment allows for repositioning of the positioning screw 4 when switching between different specifications of spiral shafts, ensuring accurate machining.

[0023] A cylindrical straightening block 8 is installed inside the spindle 1 on one side of the three-jaw chuck 2. The straightening block 8 is fitted with a positioning screw 4. Adjusting nuts B9 are installed on the positioning screws 4 on both sides of the straightening block 8. The function of the straightening block 8 is to straighten the end of the positioning screw 4 on one side of the three-jaw chuck 2, thereby ensuring that the end of the positioning screw 4 on one side of the three-jaw chuck 2 is not easily displaced, thus ensuring that the positioning screw 4 accurately positions the spiral shaft and ensures accurate turning of the spiral shaft end. The function of the adjusting nut B9 is to adjust the relative position of the straightening block 8 and the positioning screw 4 when adjusting the positioning position of the positioning screw 4, thereby ensuring the straightening effect of the straightening block 8, making the positioning screw 4 accurately positioned, and thus ensuring accurate positioning of the spiral shaft.

[0024] The three-jaw chuck 2 includes a chuck body 201, a lead screw 202, a lead screw nut 203, a synchronizing gear 204, and jaws 205. Lead screws 202 are evenly distributed in a ring on the chuck body 201. Lead screw nuts 203 are threaded onto the lead screws 202 and are movably connected to countersunk grooves on the chuck body 201. The lead screw nuts 203 are cuboid in shape, with helical teeth on their top end face and racks on their inner sides. Synchronizing gears 204 are movably mounted on the chuck body 201 between the lead screw nuts 203, meshing with the racks of each lead screw nut 203. Jaws 205 are movably mounted on the chuck body 201 above the lead screw nuts 203, with helical teeth on their bottom end face. The helical teeth of the jaws 205 mesh with the helical teeth of the lead screw nuts 203. The jaws 205 are welded to the clamping plate 3. The function of the lead screw 202 is to drive the lead screw nut 203 to slide in the sinker when the lead screw 202 is rotated. During the movement of the lead screw nut 203, on the one hand, the lead screw nut 203 drives the pawl 205 to move through the helical teeth; on the other hand, the lead screw nut 203 drives the synchronous gear 204 to rotate through the rack. During the rotation of the synchronous gear 204, the other lead screw nuts 203 are driven to move through the rack. In turn, during the movement of the other lead screw nuts 203, the pawl 205 is driven to move through the helical teeth, so that all the pawls 205 move synchronously (synchronously open or synchronously retract towards the center), thereby driving all the clamps 3 to move synchronously.

[0025] When using the clamping mechanism of the auger shaft of this meat grinder, rotating the lead screw 202 of the three-jaw chuck 2 causes the clamping plates 3 to open via the lead screw nut 203, the synchronizing gear 204, and the jaws 205. After the clamping plates 3 open, the auger shaft is inserted between the clamping plates 3, so that the end of the auger shaft abuts against the end of the positioning screw 4, which positions the auger shaft. After the auger shaft is inserted between the clamping plates 3, reversing the lead screw 202 causes the clamping plates 3 to retract inward, clamping the auger shaft.

[0026] After the spiral shaft is clamped, the lathe drives the spindle 1 to rotate. The spindle 1 drives the spiral shaft to rotate in sequence through the three-jaw chuck 2 and the clamping plate 3. During the rotation of the spiral shaft, the spiral shaft is turned by a milling cutter.

[0027] The clamping mechanism of the spiral shaft of this meat grinder can clamp the spiral part of the spiral shaft through the clamping plate 3, so that the clamping position is close to the processing position, which can effectively reduce the error caused by offset. At the same time, the clamping plate 3 is adapted to the spiral shaft, further reducing the clamping error of the spiral shaft, while ensuring that the spiral shaft is clamped tightly. The positioning screw can position the spiral shaft, which allows the spiral shaft to be machined at the end head with a fixed turning amount, without the need for repeated measurement and calculation, effectively reducing labor intensity and improving work efficiency. It solves the problems of large processing error, high labor intensity and low processing efficiency of existing processing methods.

Claims

1. A clamping mechanism for a meat grinder screw shaft, comprising a lathe spindle (1), a three-jaw chuck (2), a clamping plate (3), and a positioning screw (4), wherein the spindle (1) is cylindrical, and a three-jaw chuck (2) is fixedly mounted at one end of the spindle (1), characterized in that: The three-jaw chuck (2) has clamping plates (3) evenly distributed in a ring on it; the other end of the spindle (1) is fitted with a positioning screw (4), and the end of the positioning screw (4) extends through the three-jaw chuck (2) to the space between the clamping plates (3).

2. The clamping mechanism for a meat grinder screw shaft according to claim 1, characterized in that: The cross-section of the clamp (3) is arc-shaped, and the radius of the inner wall arc surface of the clamp (3) gradually decreases from the outer end of the clamp (3) towards the end of the clamp (3) on the side of the three-jaw chuck (2).

3. The clamping mechanism for a meat grinder screw shaft according to claim 1, characterized in that: The positioning screw (4) is fitted with a positioning sleeve (5) at its end. The positioning sleeve (5) is cup-shaped and is fixedly connected to the main shaft (1) by a set screw (6). Adjusting nuts A (7) are provided on the positioning screws (4) on both sides of the positioning sleeve (5).

4. The clamping mechanism for a meat grinder screw shaft according to claim 1, characterized in that: A cylindrical straightening block (8) is provided inside the main shaft (1) on one side of the three-jaw chuck (2), and the straightening block (8) is connected to the positioning screw (4) in a sleeve; adjusting nuts B (9) are provided on the positioning screws (4) on both sides of the straightening block (8).

5. The clamping mechanism for a meat grinder screw shaft according to claim 1, characterized in that: The three-jaw chuck (2) includes a chuck body (201), a lead screw (202), a lead screw nut (203), a synchronous gear (204), and jaws (205), which are welded to the clamping plate (3).

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