Cutting knife

Abstract

The utility model belongs to the technical field of cutters, and particularly relates to a cutter which comprises a cutter body and a shaft body, a key groove is formed in the surface of the shaft body, and a flat key is embedded in the key groove. The cutter body is limited on the shaft body by the two limiting rings, so that the stability of mounting the cutter body on the shaft body is enhanced; the square blocks and the square grooves are matched for use, so that the cutter body and the shaft body are tightly reinforced and connected into a whole, and the effect of transmitting torque force to the cutter body by the shaft body is enhanced; after the first screw rod, the second screw rod and the third screw rod are screwed out, the limiting rings are pulled downwards, so that the square block is separated downwards from the interior of the square groove, after the blocking piece is taken down, the front limiting ring can be taken out forwards along the shaft body, and the rear limiting ring is separated backwards from the flat key. And then a hammer is used for knocking out the flat key forwards from the interior of the key groove along the horizontal plane of the shaft body, so that the damaged cutter body can be quickly dismounted, and then a new cutter body is replaced according to the step opposite to the dismounting step, so that the problem that the cutter body is inconvenient to replace due to the unreasonable structure of the existing cutter is solved.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool technology, and in particular relates to a cutting tool. Background Technology

[0002] Cutting blades are used to cut objects, separating them from a whole into multiple individual parts. When a circular cutting blade rotates, its edge contacts the object, shearing it. Over time, this wear and tear necessitates replacement before the blade fails. Currently, a tight and secure connection between the cutting blade and its shaft is required to ensure safe operation. However, this overly tight fit makes disassembly difficult, increasing the complexity of blade replacement. Conversely, while a looser fit facilitates disassembly and replacement, it creates a larger gap between the blade and shaft, reducing safety. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and solve the problem that the existing cutting blade has an unreasonable structure, which makes it inconvenient to change the blade body.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a cutting tool, including a blade body and a shaft, wherein a keyway is formed on the surface of the shaft body and a flat key is embedded in the keyway;

[0005] A shaft is inserted through the center of the blade body, and a pair of limiting rings are fitted onto the outer surface of the shaft body, located at the front and rear ends of the blade body respectively.

[0006] The two limiting rings are fitted around the flat key, and the upper end of the flat key extends upward to the inner end of the two limiting rings, with the flat key and the limiting rings being embedded in each other.

[0007] A square groove is provided on the lower side of the front end of the blade body. The square groove extends upward into the interior of the shaft body. A square block is embedded inside the square groove, and the square block is embedded between the shaft body and the blade body.

[0008] In a preferred embodiment of this invention, a third screw penetrating into the body of the shaft is threadedly connected to either side of the outer surface of the two limiting rings.

[0009] In a preferred embodiment of this invention, the keyway extends through the front end of the shaft body, and a baffle plate located in front of the keyway is provided at the front end of the shaft body. A first screw is threadedly connected between the baffle plate and the shaft body along their axial centerline.

[0010] In a preferred embodiment of this invention, a limiting ring is fixedly connected to the lower end of the block. The diameter of the limiting ring is larger than the side length of the square groove, and the limiting ring is embedded inside the square groove.

[0011] In a preferred embodiment of this invention, a second screw is threadedly connected to the front end of the shaft, and the rear end of the second screw passes through the block, with the block being threadedly connected to the second screw.

[0012] In a preferred embodiment of this invention, a process hole is provided on the lower side of the baffle, and the first screw is located above the process hole.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0014] The keyway and flat key are fitted together to connect the spindle and the cutter body into one unit, allowing the spindle to transmit torque to the cutter body. Two retaining rings restrain the cutter body on the spindle, enhancing the stability of the cutter body mounted on the spindle. The square block and square slot work together to not only tightly and firmly connect the cutter body and the spindle into one unit, but also enhance the spindle's ability to transmit torque to the cutter body. Simply unscrew the first, second, and third screws, then pull down the retaining rings to disengage the square block from the square slot. After removing the retaining plate, remove the front retaining ring forward along the spindle and the rear retaining ring backward from the flat key. Then, use a hammer to knock the flat key forward from the keyway along the horizontal plane of the spindle to quickly remove the damaged cutter body. Then, replace it with a new cutter body by reversing the disassembly steps. This solution not only ensures a stable connection between the cutter body and the spindle, but also allows for quick removal and replacement of the cutter body, and enhances the spindle's ability to transmit torque to the cutter body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a diagram illustrating the installation effect of the block according to this utility model;

[0017] Figure 3 This is a sectional view showing the installation effect of the cutter body and shaft of this utility model;

[0018] Figure 4 This is a cross-sectional view of the internal structure of the shaft of this utility model;

[0019] Figure 5 This is a structural diagram of the keyway of this utility model.

[0020] In the diagram: 1. Tool body; 2. Shaft body; 3. Limiting ring; 4. Flat key; 5. Baffle; 6. First screw; 7. Second screw; 8. Third screw; 9. Keyway; 10. Limiting ring; 11. Block; 12. Square groove. Detailed Implementation

[0021] Please see Figure 1-5This utility model provides a technical solution: a cutting tool, including a blade body 1 and a shaft body 2. A keyway 9 is formed on the surface of the shaft body 2, and a flat key 4 is embedded inside the keyway 9. The shaft body 2 is inserted through the center of the blade body 1, and a pair of limiting rings 3 are fitted onto the outer surface of the shaft body 2, located at the front and rear ends of the blade body 1 respectively. The two limiting rings 3 are fitted around the flat key 4, and the upper end of the flat key 4 extends upward to the inner end of the two limiting rings 3, where the flat key 4 is embedded. A square groove 12 is formed on the lower side of the front end of the blade body 1. The square groove 12 extends upward into the interior of the shaft 2. A block 11 is embedded inside the square groove 12, and the block 11 is embedded between the shaft 2 and the cutter body 1. The limiting ring 10 is embedded inside the square groove 12 to restrict the movement of the block 11. The square groove 12 provides space for the block 11. The block 11 and the square groove 12 work together to fill the space inside the square groove 12. After the second screw 7 passes through the shaft 2 and the block 11, the second screw 7 secures the block 11 in the square groove 12.

[0022] The keyway 9 provides space for the flat key 4. The flat key 4 is placed in the keyway 9, and the keyway 9 and the flat key 4 are fitted together. The center of the cutter body 1 has a "flat key 4 receiving groove" structure that matches the flat key 4. A part of the flat key 4 is embedded in the "flat key 4 receiving groove" structure, so that the shaft body 2 and the cutter body 1 are connected as one unit. After the shaft body 2 is connected to the required equipment power output end, the flat key 4 and the block 11 will rotate with the shaft body 2. The force of the shaft body 2 rotation will be transmitted to the flat key 4 and the block 11, and then from the flat key 4 and the block 11 to the cutter body 1. The flat key 4 and the block 11 drive the cutter body 1 and the shaft 2 to rotate synchronously. The shaft body 2 has the function of transmitting torque force to the cutter body 1.

[0023] The first screw 6 reinforces the baffle 5 to the front end of the shaft 2. The first screw 6 fastens the baffle 5 to the front end of the shaft 2. The baffle 5 blocks the keyway 9 notch that extends through the front end of the shaft 2. The baffle 5 can effectively prevent the flat key 4 from dislodging forward from the keyway 9 when the shaft 2 rotates. The baffle 5 strengthens the stability of the flat key 4 installed inside the keyway 9.

[0024] The third screw 8 is used to fasten the two corresponding limiting rings 3 to the surface of the shaft 2. The inner ends of the two limiting rings 3 are in close contact with the front and rear ends of the cutter body 1, respectively. The two limiting rings 3 form a blocking vertical surface on the surface of the shaft 2. The limiting rings 3 restrict the cutter body 1 on the shaft 2 and prevent the cutter body 1 from sliding back and forth on the shaft 2, thereby strengthening the stability of the cutter body 1 mounted on the shaft 2.

[0025] The above structure shows that the key connection method plus the square block 11 reinforcement connection method together generate two fixing points on the shaft 2, which not only tightly reinforces the connection between the cutter body 1 and the shaft 2 into one, but also enhances the effect of the shaft 2 in transmitting torque force to the cutter body 1.

[0026] The keyway 9 extends through the front end of the switch body 2. The baffle 5 is used to block the keyway 9 extending through the front end of the switch body 2 to prevent the flat key 4 from coming off the keyway 9.

[0027] A limiting ring 10 is fixedly connected to the lower end of block 11. The diameter of the limiting ring 10 is larger than the side length of the square groove 12. The limiting ring 10 is embedded in the square groove 12. A baffle 5 is provided at the front end of the shaft body 2, located in front of the keyway 9. A first screw 6 is threadedly connected to the axis of the baffle 5 and the shaft body 2. A second screw 7 is threadedly connected to the front end of the shaft body 2. The rear end of the second screw 7 passes through the block 11. The block 11 is threadedly connected to the second screw 7. A third screw 8, which passes through the inside of the shaft body 2, is threadedly connected to either side of the outer surface of the two limiting rings 3. When the cutter body 1 needs to be replaced after a period of use due to wear, simply unscrew the first screw 6, the second screw 7, and the third screw 8, and then pull down the limiting ring 10 to disengage the block 11 from the inside of the square groove 12. A process hole is provided on the lower side, and the first screw 6 is located above the process hole. This makes it easier to reduce the weight of the baffle 5 and to tighten the second screw 7. The structure of the baffle 5 is optimized. After removing the baffle 5, the front limiting ring 3 can be taken out forward along the shaft 2 and the rear limiting ring 3 can be removed backward from the flat key 4, so that the flat key 4 is exposed on the surface of the shaft 2. The side of the flat key 4 away from the shaft 2 protrudes from the surface of the shaft 2. Then, use a hammer to knock the flat key 4 forward from the inside of the keyway 9 along the horizontal plane of the shaft 2. The front end of the flat key 4 is removed forward from the front end of the shaft 2 along the keyway 9. After the flat key 4 is removed from the "flat key 4 receiving groove" structure opened in the center of the cutter body 1, the damaged cutter body 1 can be removed forward along the shaft 2. The damaged cutter body 1 can be quickly removed. Then, the new cutter body 1 can be replaced by following the reverse steps of the disassembly steps.

[0028] The above solution not only allows the cutter body 1 to maintain a stable connection with the shaft 2, but also allows the cutter body 1 to be quickly removed and replaced. In addition, it also enhances the effect of the shaft 2 in transmitting torque force to the cutter body 1.

Claims

1. A cutting tool, comprising a blade body (1) and a shaft body (2), characterized in that: The shaft (2) has a keyway (9) on its surface, and a flat key (4) is embedded inside the keyway (9). A shaft (2) is inserted through the center of the blade body (1), and a pair of limiting rings (3) are fitted on the outer surface of the shaft (2) at the front and rear ends of the blade body (1). The two limiting rings (3) are fitted around the flat key (4), and the upper end of the flat key (4) extends upward to the inner end of the two limiting rings (3). The flat key (4) is embedded with the limiting rings (3). A square groove (12) is provided on the lower front end of the blade body (1). The square groove (12) extends upward into the shaft body (2). A block (11) is embedded in the square groove (12). The block (11) is embedded between the shaft body (2) and the blade body (1).

2. The cutting tool as described in claim 1, characterized in that: The two limiting rings (3) are threaded on either side of the outer surface and a third screw (8) extends into the shaft (2).

3. A cutting tool as described in claim 1, characterized in that: The keyway (9) extends through the front end of the shaft (2), and a baffle (5) is provided at the front end of the shaft (2) in front of the keyway (9). A first screw (6) is threaded between the baffle (5) and the shaft (2) along the axis.

4. A cutting tool as described in claim 1, characterized in that: The lower end of the block (11) is fixedly connected to a limiting ring (10), the diameter of the limiting ring (10) is greater than the side length of the square groove (12), and the limiting ring (10) is embedded in the square groove (12).

5. A cutting tool as described in claim 1, characterized in that: The front end of the shaft (2) is threadedly connected to a second screw (7), and the rear end of the second screw (7) passes through the block (11) and the block (11) is threadedly connected to the second screw (7).

6. A cutting tool as described in claim 3, characterized in that: The baffle (5) has a process hole on its lower side, and the first screw (6) is located above the process hole.

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