Expansion type aluminum pipe rotating mandrel

Abstract

The utility model belongs to the technical field of liquid material packaging aluminum pipe machining, and particularly provides an expansion type aluminum pipe rotating mandrel which comprises a main shaft, an expansion sleeve, a pull rod and a reset lifting pin, a locking sleeve screw connection cavity, a spring assembly cavity and a pull rod assembly cavity are coaxially and sequentially formed in the main shaft, and expansion sleeve assembly threads are arranged on the outer wall of the pull rod assembly cavity. The inner diameter of the spring assembly cavity is larger than that of the pull rod assembly cavity. According to the scheme, the aluminum pipe is fixed through the expansion sleeve, the contact area between the expansion sleeve and the aluminum pipe is large, the friction force between the expansion sleeve and the aluminum pipe is increased through positive pressure generated by outward expansion of the expansion pipe, aluminum foam cannot be generated in the thread machining process, and the aluminum pipe is not prone to deformation; the mandrel is formed by splicing and combining a plurality of parts, when any part is damaged or the specification of the aluminum pipe to be machined changes, only the corresponding part needs to be replaced, assembly and maintenance are convenient, the applicability is high, and compared with overall replacement of the mandrel, the scheme reduces the equipment use cost.

Description

Technical Field

[0001] This utility model belongs to the field of liquid packaging aluminum tube processing technology, and specifically provides an expansion type aluminum tube rotating mandrel. Background Technology

[0002] Liquids such as adhesives and toothpaste are usually packaged in aluminum tubes. During the manufacturing process of aluminum tube packaging, a threading machine is used to process the threads on the nozzles of the aluminum tubes.

[0003] Reference Figure 5 and Figure 6 Currently, the mandrel of thread-pressing machines is a one-piece molded structure with a tapered tip at its end. During processing, an aluminum tube is fitted onto the mandrel, and its fixation relies primarily on the friction between the inner wall of the tube's nozzle and the contact surface of the mandrel's tapered tip. To ensure stable fixation, the outer surface of the tapered tip typically has spiral anti-slip grooves. During threading, the friction from these anti-slip grooves generates aluminum dust, which remains inside the aluminum tube and is difficult to clean. This results in aluminum dust impurities in the final packaged liquid, affecting product quality. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an expansion-type aluminum tube rotating mandrel, including a main shaft, an expansion sleeve, a pull rod, and a reset pin. The main shaft has a locking sleeve screw connection cavity, a spring assembly cavity, and a pull rod assembly cavity coaxially arranged in sequence. The outer wall of the pull rod assembly cavity is provided with an expansion sleeve mating thread. The inner diameter of the spring assembly cavity is larger than that of the pull rod assembly cavity. One end of the pull rod is a threaded assembly end, and the other end is provided with an expansion core. The threaded assembly end of the pull rod passes through the pull rod assembly cavity, the spring assembly cavity, and the locking sleeve screw connection cavity in sequence. The reset pin is screwed onto the threaded assembly end of the pull rod. The spring is sleeved on the pull rod and is located in the spring assembly cavity. The expansion sleeve is sleeved on the main shaft and is screwed to the main shaft through the expansion sleeve mating thread.

[0005] Furthermore, the expansion sleeve has multiple dividing grooves, the outer wall of the expansion sleeve is divided into multiple arc-shaped lobes by the dividing grooves, and the inner wall of the end of the expansion sleeve is a tapered inclined surface that expands outward and contracts inward. The expansion core is tapered, and its shape matches the inner wall of the end of the expansion sleeve.

[0006] Furthermore, an alloy sleeve is fitted onto the main shaft, and the alloy sleeve abuts against the expansion sleeve.

[0007] Furthermore, the locking sleeve is screwed into the locking sleeve screw cavity, the spring pressure sleeve is screwed into the threaded assembly end of the pull rod, and the two ends of the spring pressure sleeve abut against one end of the locking sleeve and one end of the spring, respectively, while the other end of the spring abuts against the diameter change point between the spring assembly cavity and the pull rod assembly cavity.

[0008] The beneficial effects of using this utility model are:

[0009] This solution uses an expansion sleeve to fix the aluminum tube. The contact area between the expansion sleeve and the aluminum tube is large, and the positive pressure generated by the outward expansion of the expansion sleeve increases the friction between it and the aluminum tube. No aluminum dust will be generated during the threading process, and the aluminum tube is less likely to deform.

[0010] The mandrel in this solution is assembled from multiple parts. If any part is damaged or the specifications of the aluminum tube to be processed change, the corresponding part can be replaced. This makes it easy to assemble and maintain, and it is highly adaptable. Compared with replacing the entire mandrel, this solution reduces the cost of equipment use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is an exploded view of the present invention;

[0013] Figure 3 This is an axial cross-sectional view of the present invention;

[0014] Figure 4 This is an axial cross-sectional view of the spindle of this utility model;

[0015] Figure 5 This is an axial cross-sectional view of a mandrel in the prior art;

[0016] Figure 6 This is an assembly drawing of the existing mandrel and the aluminum tube to be processed;

[0017] Figure 7 This is an assembly drawing of the present invention and the aluminum tube to be processed;

[0018] The reference numerals in the figures include:

[0019] 1. Spindle; 101. Locking sleeve threaded cavity; 102. Spring assembly cavity; 103. Tie rod assembly cavity; 104. Expansion sleeve mating thread;

[0020] 2. Expansion sleeve; 3. Expansion core; 4. Pull rod; 5. Reset pin; 6. Alloy sleeve; 7. Locking sleeve; 8. Spring compression sleeve; 9. Spring; 10. Aluminum tube. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] Reference Figures 1-4An expandable aluminum tube rotating mandrel includes a main shaft 1, an expansion sleeve 2, a pull rod 4, and a reset pin 5. The main shaft 1 has a locking sleeve screw connection cavity 101, a spring assembly cavity 102, and a pull rod assembly cavity 103 coaxially arranged inside. The outer wall of the pull rod assembly cavity 103 is provided with an expansion sleeve fitting thread 104. The inner diameter of the spring assembly cavity 102 is larger than that of the pull rod assembly cavity 103. One end of the pull rod 4 is a threaded assembly end, and the other end is provided with an expansion core 3. The threaded assembly end of the pull rod 4 passes through the pull rod assembly cavity 103, the spring assembly cavity 102, and the locking sleeve screw connection cavity 101 in sequence. The reset pin 5 is screwed onto the threaded assembly end of the pull rod 4. The spring 9 is sleeved on the pull rod 4 and is located inside the spring assembly cavity 102. The expansion sleeve 2 is sleeved on the main shaft 1 and is screwed to the main shaft 1 through the expansion sleeve fitting thread 104.

[0023] Under the action of spring 9, the pull rod 4 is pulled toward the reset pin 5, and the expansion core 3 pushes the expansion sleeve 2 outward to make it elastically deformed, thus realizing the change of diameter;

[0024] When the reset pin 5 is subjected to an externally applied thrust, the spring 9 is compressed, the expansion core 3 disengages from the expansion sleeve 2, and the expansion sleeve 2 springs back to its original position.

[0025] The expansion sleeve 2 has multiple dividing grooves. The outer wall of the expansion sleeve 2 is divided into multiple arc-shaped lobes by the dividing grooves. The inner wall of the end of the expansion sleeve 2 is a tapered inclined surface that expands outward and contracts inward. The expansion core 3 is tapered and its shape matches the inner wall of the end of the expansion sleeve 2.

[0026] When the expansion core 3 axially compresses the inner wall of the end of the expansion sleeve 2, the multiple arc-shaped petals of the expansion sleeve 2 separate outward, achieving the effect of expansion and diameter change.

[0027] An alloy sleeve 6 is fitted onto the spindle 1, and the alloy sleeve 6 abuts against the expansion sleeve 2.

[0028] The locking sleeve 7 is screwed into the locking sleeve screw cavity 101, and the spring compression sleeve 8 is screwed into the threaded assembly end of the pull rod 4. The two ends of the spring compression sleeve 8 abut against one end of the locking sleeve 7 and one end of the spring 9, respectively. The other end of the spring 9 abuts against the diameter change point between the spring assembly cavity 102 and the pull rod assembly cavity 103.

[0029] Spring 9 pushes pull rod 4 through spring sleeve 8, and locking sleeve 7 limits and adjusts spring sleeve 8.

[0030] Before the processing begins, when the aluminum tube 10 is not fitted onto the expansion sleeve 2, the processing equipment applies a pushing force to the reset pin 5, and the expansion sleeve 2 is in a stationary state, with its outer diameter being smaller than the inner diameter of the aluminum tube 10.

[0031] Reference Figure 7After the processing equipment attaches the aluminum tube 10 onto the expansion sleeve 2, it removes the thrust applied to the reset pin 5, the spring 9 pushes the pull rod 4, the expansion core 3 squeezes the expansion sleeve 2 to expand and change its diameter, the expansion sleeve 2 supports the inner wall of the aluminum tube 10 and fixes it, and then the processing equipment performs a threading process on the nozzle of the expansion sleeve 2.

[0032] After the threading process is completed, the processing equipment applies a thrust to the reset pin 5 again, the expansion sleeve 2 springs back to its original position, the processing equipment removes the aluminum tube 10, and then begins the next processing cycle.

[0033] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. An expansion-type aluminum tube rotating mandrel, characterized in that: The assembly includes a spindle, an expansion sleeve, a pull rod, and a return pin. The spindle has a locking sleeve threaded cavity, a spring assembly cavity, and a pull rod assembly cavity coaxially arranged inside. The outer wall of the pull rod assembly cavity has an expansion sleeve mating thread. The inner diameter of the spring assembly cavity is larger than that of the pull rod assembly cavity. One end of the pull rod is a threaded assembly end, and the other end has an expansion core. The threaded assembly end of the pull rod passes through the pull rod assembly cavity, the spring assembly cavity, and the locking sleeve threaded cavity in sequence. The return pin is screwed onto the threaded assembly end of the pull rod. The spring is sleeved on the pull rod and located within the spring assembly cavity. The expansion sleeve is sleeved on the spindle and is screwed onto the spindle via the expansion sleeve mating thread.

2. The expansion-type aluminum tube rotating mandrel according to claim 1, characterized in that: The expansion sleeve has multiple dividing grooves, and the outer wall of the expansion sleeve is divided into multiple arc-shaped lobes by the dividing grooves. The inner wall of the end of the expansion sleeve is a tapered inclined surface that expands outward and contracts inward. The expansion core is tapered, and its shape matches the inner wall of the end of the expansion sleeve.

3. The expansion-type aluminum tube rotating mandrel according to claim 1, characterized in that: An alloy sleeve is fitted onto the main shaft, and the alloy sleeve abuts against the expansion sleeve.

4. The expansion-type aluminum tube rotating mandrel according to claim 1, characterized in that: The locking sleeve is screwed into the locking sleeve screw cavity, and the spring pressure sleeve is screwed into the threaded assembly end of the pull rod. The two ends of the spring pressure sleeve abut against one end of the locking sleeve and one end of the spring, respectively, and the other end of the spring abuts against the diameter change point between the spring assembly cavity and the pull rod assembly cavity.

Images