A pneumatic core expansion device

Abstract

This utility model discloses a pneumatic core-expanding device, including a disc body with multiple radially opening grooves and an axial hole communicating with the grooves. A driving component includes a push head coaxial with the disc body, capable of rising and falling within the axial hole. A chuck assembly includes two detachably connected blocks: block one slides along the grooves, and block two extends out of the disc body and can insert heat shrink tubing. Block one is connected to the push head via a connecting assembly; when the push head moves, the connecting assembly pushes block one to slide along the grooves. A limiting ring is fitted onto block two to limit the distance the blocks two move away from each other. The core-expanding device achieves efficient core expansion of different heat shrink tubing types.

Description

Technical Field

[0001] This utility model relates to the field of fixing fixture technology, and in particular to a pneumatic core expansion device. Background Technology

[0002] In motors, heat shrink tubing is often used on lead wires to ensure insulation and improve appearance. Because there are many types of heat shrink tubing, tubing that is too thick cannot properly wrap the wire after heating, while tubing that is too thin is difficult to fit into the product. Therefore, a core-expanding device is needed to open the heat shrink tubing for subsequent processing. Manually expanding the core of the heat shrink tubing is time-consuming, labor-intensive, and reduces processing efficiency. Furthermore, some core-expanding fixtures are only suitable for heat shrink tubing of one diameter, resulting in low versatility. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a pneumatic expansion device to achieve efficient expansion of different heat shrink tubing.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a pneumatic core expansion device, comprising:

[0005] The disc body is provided with a plurality of radially opening grooves and shaft holes that communicate with the grooves and are opened along the axial direction of the disc body;

[0006] A driving component, the driving component including a push head coaxial with the disc body, the push head being able to move up and down within the shaft hole;

[0007] A claw assembly includes a detachably connected block 1 and block 2. Block 1 slides along the slide groove, and block 2 extends out of the disc and can be inserted into a heat shrink tubing. Block 1 is connected to the push head via a connecting assembly. When the push head moves, the connecting assembly pushes block 1 to slide along the slide groove.

[0008] A limiting ring is fitted onto the second block to limit the distance the second blocks can move away from each other.

[0009] The beneficial effects of this utility model are as follows:

[0010] The axial movement of the pusher is converted into radial movement of the jaw assembly by the connecting component, enabling the jaw assemblies to move closer and then further apart. When the jaw assemblies approach each other, the heat shrink sleeve is fitted onto them; when they move apart, the heat shrink sleeve is opened. During this process, the movement of the jaw assembly is driven by the lifting and lowering of the pusher head, achieving rapid processing of the heat shrink sleeve. A limiting ring is also fitted over the jaw assembly. When the jaw assemblies are in their initial position, a gap exists between the limiting ring and the jaw assembly. The limiting ring limits the movement distance of the jaw assemblies when they move apart, preventing excessive movement that could damage the heat shrink sleeve.

[0011] Furthermore, the push head has a frustum structure with the small circular surface of the frustum structure facing upwards;

[0012] The connecting assembly includes a roller and an elastic element. The roller is rotatably connected to the block and abuts against the side wall of the push head. The elastic element always provides a force that brings the block closer to itself.

[0013] The inclined surface of the frustum structure is used to achieve a change in the direction of force. The rollers on block one create a rolling connection between the rollers and the inclined surface of the frustum structure, reducing friction while propelling block one. Furthermore, because the frustum structure is not planar but curved, the rolling contact of the rollers allows block one to move horizontally.

[0014] Furthermore, the elastic element is a tension spring, one end of which is fixedly connected to the side wall of the shaft hole, and the other end of which is fixedly connected to the block.

[0015] Furthermore, the tension spring extends along the corresponding moving direction of the block one, and the tension provided by the tension spring can directly pull the block one to move. A fixing rod is fixed on the side wall of the shaft hole, the fixing rod extends along the horizontal plane and is perpendicular to the moving direction of the block one, and one end of the tension spring is connected to the fixing rod.

[0016] Furthermore, the second block includes a horizontally arranged fixing part and a vertically arranged positioning part. The fixing part is fixedly connected to the first block by a locking member, and the positioning part includes a stepped outer wall.

[0017] Furthermore, the outer wall includes a first part and a second part. The first part is close to the fixing part, and the limiting rings of different diameters can be fitted onto the first part. The heat shrink tubing is fitted onto the second part. The limiting rings are directly fitted onto the second part without needing to be fixed or connected, and different limiting rings can be replaced with heat shrink tubing of different diameters.

[0018] Furthermore, the driving component also includes a piston section. The disc body has a sealed transmission chamber. The piston section moves up and down within the transmission chamber, dividing it into an upper chamber and a lower chamber that are not interconnected. The disc body has air inlets corresponding to the upper chamber and the lower chamber, respectively. Both air inlets are connected to an external air supply component. By adjusting the air pressure difference between the upper and lower chambers, the driving component is driven to rise and fall, thus realizing the pneumatic operation of the firewood raising device.

[0019] Furthermore, the piston portion is connected to the push head via a connecting portion, the connecting portion being coaxial with the disc body and having a sealing ring between them. The sealing ring is used to seal the transmission cavity, separating the transmission cavity from the shaft hole.

[0020] Furthermore, the groove is a T-shaped groove, and the shape of the block one matches that of the groove. The T-shaped groove structure can limit the position of the block one in the vertical direction, preventing the block one from sliding out of the groove in the vertical direction. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0023] Figure 3 This is a top view of block one inside the disk in an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Disc body; 11. Slide groove; 12. Shaft hole; 131. Upper cavity; 132. Lower cavity;

[0026] 2. Driving component; 21. Push head; 22. Piston part; 23. Connecting part; 231. Sealing ring;

[0027] 3. Claw assembly; 31. Block 1; 32. Block 2; 321. Fixing part; 322. Positioning part; 3221. Outer wall;

[0028] 4. Limiting ring;

[0029] 51. Roller; 52. Elastic element; 53. Fixing rod. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0031] This utility model discloses a pneumatic expansion device for expanding the core of a heat shrink sleeve, thereby expanding the heat shrink sleeve and making it easier for subsequent processing.

[0032] See appendix Figure 1 As shown, the pneumatic expansion device includes a disc body 1, a driving component 2, a claw assembly 3, and a limiting ring 4. The driving component 2 drives the claw assembly 3 to move closer or further apart to expand the heat shrink sleeve.

[0033] See appendix Figure 2 As shown, the disc body 1 is provided with multiple radially opening grooves 11 and shaft holes 12 that communicate with the grooves 11 and are opened axially along the disc body 1. The driving member 2 includes a push head 21 coaxial with the disc body, and the push head 21 can move up and down within the shaft hole 12. The claw assembly 3 includes a detachably connected block 31 and a block 32. The block 31 slides along the grooves 11, and the block 32 extends out of the disc body 1 and can be inserted into a heat shrink tube. The block 31 is connected to the push head 21 through a connecting assembly. When the push head 21 moves, it pushes the block 31 to slide along the grooves 11 through the connecting assembly. The limiting ring 4 is sleeved on the block 32 to limit the movement distance of the blocks 32 when they move away from each other.

[0034] In this embodiment, the axial movement of the pushing part is converted into the radial movement of the jaw assembly 3 by the connecting component, realizing the approach and then departure of the jaw assembly 3. When the jaw assemblies 3 approach each other, the heat shrink sleeve can be fitted onto the jaw assembly 3. Then, when the jaw assemblies 3 move away from each other, the heat shrink sleeve is opened. During this process, the movement of the jaw assembly 3 is driven by the lifting and lowering of the pushing head 21, realizing the rapid processing of the heat shrink sleeve. A limiting ring 4 is also fitted over the jaw assembly 3. When the jaw assembly 3 approaches each other and is in the initial position, there is a gap between the limiting ring 4 and the jaw assembly 3. The limiting ring 4 is used to limit the movement distance of the jaw assembly 3 when they move away from each other, to avoid damage to the heat shrink sleeve caused by excessive movement distance of the jaw assembly 3.

[0035] See appendix Figure 2 As shown, the push head 21 has a frustum structure with the smaller circular surface of the frustum structure facing upwards. The connecting assembly includes a roller 51 and an elastic element 52. The roller 51 is rotatably connected to the block 31 and abuts against the side wall of the push head 21. The elastic element 52 always provides a force that brings the block 31 closer together.

[0036] In this embodiment, the inclined surface of the frustum structure is used to achieve a change in the direction of the force. When the push head 21 moves upward, the inclined surface of the frustum structure pushes the claw assemblies 3 away from each other. When the push head 21 moves downward, the force exerted on the claw assemblies 3 by the frustum structure through the inclined surface decreases, and the elastic element 52 pulls the claw assemblies 3 closer together to return to their initial position. During this process, due to the limitation of the slide groove 11, the claw assemblies 3 can only slide along the slide groove 11, that is, move radially.

[0037] The roller 51 on block 31 enables rolling connection between the roller 51 and the inclined surface of the frustum structure, reducing friction while propelling block 31. Furthermore, because the frustum structure is not planar but curved, the rolling contact of the roller 51 allows block 31 to move horizontally.

[0038] The slide groove 11 and the claw assembly 3 correspond one-to-one. In this embodiment, there are four claw assemblies 3, and the four claw assemblies 3 move simultaneously.

[0039] The elastic element 52 is a tension spring. One end of the tension spring is fixedly connected to the side wall of the shaft hole 12, and the other end of the tension spring is fixedly connected to the block 31. The tension spring has a preload, meaning it is always in a stretched state. In the initial position (where the blocks 31 are close to each other), the upper end of the side of the push head 21 contacts the roller 51, defining the position of the blocks 31, and the tension spring is in a stretched state at this time. As the push head 21 moves upward, the pushing part pushes the blocks 31 away from each other, and the tension spring continues to stretch, storing force for the resetting of the blocks 31.

[0040] See appendix Figure 3 As shown, the tension spring extends along the moving direction of the corresponding block 31, and the tension provided by the spring can directly pull the block 31 to move. To fix the tension spring, a fixing rod 53 is fixed to the side wall of the shaft hole 12. The fixing rod 53 extends horizontally and is perpendicular to the moving direction of the block 31, and one end of the tension spring is connected to the fixing rod 53. By setting the fixing rod 53, that is, by making the side wall of the shaft hole 12 protrude, the fixing rod 53 is always located above the push head 21, and will not obstruct the movement of the push head 21. At the same time, the fixing rod 53 provides support for fixing one end of the tension spring.

[0041] The second block 32 includes a horizontally arranged fixing part 321 and a vertically arranged positioning part 322. The fixing part 321 is fixedly connected to the first block 31 by a locking member. The locking member is a bolt, which can fix the first block 31 and the second block 32, and can also replace the second block 32 as needed. The positioning part 322 includes a stepped outer wall 3221. The outer wall 3221 refers to the wall facing outward when the positioning parts 322 are close to each other. The outer wall 3221 is set as a stepped structure, and different positions of the stepped structure respectively position the limiting ring 4 and the heat shrink sleeve.

[0042] The outer wall 3221 includes a first part and a second part. The first part is close to the fixing part 321, and the limiting rings 4 of different diameters can be fitted onto the first part. The heat shrink tubing is fitted onto the second part. This stepped structure facilitates the positioning of the limiting rings 4, and the limiting rings 4 do not need to be too large, which is convenient for processing.

[0043] The limiting ring 4 is directly fitted onto the first part without needing to be fixed or connected. Different limiting rings 4 can be used for heat shrink sleeves of different diameters. The core expansion device in this embodiment can expand the core of heat shrink sleeves of different diameters as long as it is within the movement range of the gripper assembly, and has high versatility.

[0044] See appendix Figure 2 As shown, the driving component 2 further includes a piston part 22. The disc body 1 has a sealed transmission cavity. The piston part 22 moves up and down within the transmission cavity, dividing the transmission cavity into an upper cavity 131 and a lower cavity 132 that are not interconnected. The disc body 1 has air inlets corresponding to the upper cavity 131 and the lower cavity 132, respectively. Both air inlets are connected to an external air supply component. By adjusting the air pressure difference between the upper cavity 131 and the lower cavity 132, the driving component 2 is driven to rise and fall, realizing the pneumatic operation of the firewood raising device.

[0045] In one embodiment, the drive element 2 may not be a piston structure, but may be driven by a cylinder to move the drive element 2 in a reciprocating linear motion.

[0046] The piston part 22 is connected to the push head 21 via a connecting part 23. The connecting part 23 is coaxial with the disc body 1 and a sealing ring 231 is provided between the connecting part 23 and the disc body 1. The sealing ring 231 is used to seal the transmission cavity and separate the transmission cavity from the shaft hole 12.

[0047] See appendix Figure 1 As shown, the slide 11 is a T-shaped groove, and the block 31 matches the shape of the slide 11. The T-shaped groove structure can limit the position of the block 31 in the vertical direction, preventing the block 31 from sliding out of the slide 11 in the vertical direction.

[0048] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pneumatic core expansion device, characterized in that: include: The disc body is provided with a plurality of radially opening grooves and shaft holes that communicate with the grooves and are opened along the axial direction of the disc body; A driving component, the driving component including a push head coaxial with the disc body, the push head being able to move up and down within the shaft hole; A claw assembly includes a detachably connected block 1 and block 2. Block 1 slides along the slide groove, and block 2 extends out of the disc and can be inserted into a heat shrink tubing. Block 1 is connected to the push head via a connecting assembly. When the push head moves, the connecting assembly pushes block 1 to slide along the slide groove. A limiting ring is fitted onto the second block to limit the distance the second blocks can move away from each other.

2. The pneumatic expansion device according to claim 1, characterized in that: The push head has a frustum structure with the small circular surface of the frustum structure facing upwards. The connecting assembly includes a roller and an elastic element. The roller is rotatably connected to the block and abuts against the side wall of the push head. The elastic element always provides a force that brings the block closer to itself.

3. The pneumatic expansion device according to claim 2, characterized in that: The elastic element is a tension spring, one end of which is fixedly connected to the side wall of the shaft hole, and the other end of which is fixedly connected to the block.

4. The pneumatic expansion device according to claim 3, characterized in that: The tension spring extends along the corresponding moving direction of the first block, and a fixing rod is fixed on the side wall of the shaft hole. The fixing rod extends along the horizontal plane and is perpendicular to the moving direction of the first block. One end of the tension spring is connected to the fixing rod.

5. The pneumatic expansion device according to claim 1, characterized in that: The second block includes a horizontally arranged fixing part and a vertically arranged positioning part. The fixing part is fixedly connected to the first block by a locking member, and the positioning part includes a stepped outer wall.

6. The pneumatic core expander according to claim 5, characterized in that: The outer wall includes a first part and a second part. The first part is close to the fixed part. The limiting rings of different diameters can be fitted onto the first part, and the heat shrink tubing is fitted onto the second part.

7. The pneumatic expansion device according to any one of claims 1-6, characterized in that: The driving component also includes a piston part, the disc body has a sealed transmission cavity, the piston part moves up and down in the transmission cavity and divides the transmission cavity into an upper cavity and a lower cavity that are not connected to each other, and the disc body has air inlets corresponding to the upper cavity and the lower cavity respectively.

8. The pneumatic expansion device according to claim 7, characterized in that: The piston is connected to the pusher head via a connecting part, and the connecting part is coaxial with the disc body and a sealing ring is provided between the connecting part and the disc body.

9. The pneumatic expansion device according to claim 1, characterized in that: The groove is a T-shaped groove, and the shape of the block is matched with that of the groove.

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