Three-pin fork secondary positioning tire expansion device

Abstract

The present invention discloses a three-pin fork secondary positioning tire expansion device, which includes a tire expansion body and an outer sleeve from left to right, a core shaft is slidably inserted in the axial middle of the tire expansion body and the outer sleeve, the tire expansion body is connected to the main shaft of the driving device, the core shaft is connected to the cylinder of the driving device, and a compression spring, a first inclined block and a second inclined block are sleeved on the core shaft from left to right in sequence, and the tops of the first inclined block and the second inclined block are respectively provided with inclined surfaces that gradually decrease from left to right, a tensioning block is vertically inserted on the outer sleeve, and the bottom shape of the tensioning block matches the inclined surface and slides against the contact, the inner cavity of the three-pin fork blank part is sleeved on the right end of the outer sleeve from right to left, and the center hole of the right end face of the three-pin fork blank part is horizontally against a top. The present invention has a reasonable structural design, and through axial secondary positioning, in conjunction with the CNC program control action of the machine tool, it can eliminate the error of manual feeding and the situation that the feeding is not in place and cannot be close to the positioning pin, and greatly improve the processing accuracy of parts.

Description

Technical Field

[0001] The invention relates to a tire expansion device for automobile accessories, in particular to a three-pin shaft fork secondary positioning tire expansion device. Background Art

[0002] At present, in the market, the three-pin fork in the automobile parts is usually processed and produced by tightening the inner cavity of the part with the tire expansion device, and using the positioning pin at the front end of the tire expansion to press the bottom of the inner cavity of the part for positioning. However, due to the manual feeding during clamping and positioning, the operator often fails to feed the material in place in the axial direction when manually feeding the tire expansion and clamping, and fails to get close to the positioning pin, and often the situation of not feeding in place affects the processing accuracy of the parts.

[0003] In summary, there is a need for a three-pin fork tire expansion device with reasonable structural design and accurate axial positioning. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing three-pin fork tire expansion device has inaccurate axial positioning, which affects the processing accuracy.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a three-pin shaft fork secondary positioning tire inflation device, which includes a tire inflation body and a jacket from left to right, the tire inflation body and the jacket are coaxially arranged, and a core shaft is slidably penetrated in the axial middle of the tire inflation body and the jacket, the tire inflation body is connected to the main shaft of the driving device, and the core shaft is connected to the cylinder of the driving device, and a circle of annular flange is protruding on the outer peripheral surface of the core shaft, and the annular flange is built into the tire inflation body and horizontally slidably arranged, and the end of the annular flange The end face of the annular flange is arranged relatively parallel to the end face of the outer sleeve, three guide pins are vertically penetrated between the end face of the annular flange and the end face of the outer sleeve, and the three guide pins are evenly distributed along the circumference of the core shaft. The guide pin is parallel to the core shaft, and the two ends of the guide pin are respectively slidably penetrated in the end face of the annular flange and the end face of the outer sleeve. The part of the core shaft penetrated in the outer sleeve is a two-stage shaft-shaped large diameter part and a small diameter part from left to right, and a compression spring, a first inclined block are slidably sleeved on the small diameter part from left to right. and a second inclined block, the two ends of the compression spring respectively abut against the end surface of the large diameter portion and the end surface of the first inclined block, a first connecting bolt is axially passed through the right end surface of the core shaft, and the first connecting bolt is successively passed through the second inclined block and the first inclined block to the left, the right end outer edge of the first connecting bolt abuts against the right end surface of the second inclined block and limits the second inclined block to slide along the core shaft, the tops of the first inclined block and the second inclined block are respectively provided with inclined surfaces gradually decreasing from left to right, and the corresponding The inclined surfaces are respectively provided with two notches vertically, and tension blocks are vertically inserted in the notches, the top of the tension blocks are exposed from the notches, and the bottom shape of the tension blocks matches the inclined surface and slides against it. A protective cover is matched and fixed on the right end face of the outer sleeve, and three locating pins are fixed on the outer end face of the protective cover protruding evenly along the circumferential direction. The inner cavity of the three-pin axle fork blank part is sleeved on the right end of the outer sleeve from right to left from the outside of the protective cover, and a top point is horizontally abutted against the center hole of the right end face of the three-pin axle fork blank part.

[0006] In the above solution, the bottoms of the two tensioning blocks are inclined surfaces that match the first inclined block and the second inclined block respectively, and the first inclined block and the second inclined block have the same inclination.

[0007] In the above scheme, three second connecting bolts are vertically penetrated on the mutual abutment surfaces of the tire expanding body and the outer casing, and the three second connecting bolts are evenly distributed along the circumference of the tire expanding body. The second connecting bolts are parallel to the axial direction of the tire expanding body, and the two ends of the second connecting bolts are respectively fixedly penetrated in the mutual abutment surfaces of the tire expanding body and the outer casing.

[0008] In the above scheme, the driving device and the center are respectively connected to the machine tool and the movements are controlled by the machine tool numerical control program.

[0009] In the above solution, the space where the annular flange is built into the tire expansion body has a certain horizontal sliding length, and the left end surface of the annular flange faces the inner wall of the tire expansion body.

[0010] The invention has reasonable structural design, and can eliminate manual feeding errors and the situation that the material is not in place and cannot be close to the positioning pin through axial secondary positioning and cooperate with the machine tool CNC program control action, thereby greatly improving the part processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure assembly of the present invention;

[0012] Figure 2 for Figure 1 Schematic diagram of the tripod blank without assembly;

[0013] Figure 3 for Figure 2 Right view of;

[0014] Figure 4 for Figure 1 Schematic diagram of the three-pin fork blank part. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with the accompanying drawings.

[0016] The present invention discloses a three-pin fork secondary positioning tire expansion device, and those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It should be particularly pointed out that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention, and relevant personnel can obviously modify or appropriately change and combine the contents described in this article without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0017] In the present invention, unless otherwise specified, scientific and technical terms used herein have the meanings commonly understood by those skilled in the art.

[0018] like Figures 1 to 4 As shown, the three-pin fork secondary positioning tire inflation device provided by the present invention includes a tire inflation body 1 and an outer sleeve 4 from left to right, the tire inflation body 1 and the outer sleeve 4 are coaxially arranged, and three second connecting bolts 12 are vertically penetrated on the mutual abutment surfaces of the tire inflation body 1 and the outer sleeve 4. The three second connecting bolts 12 are evenly distributed along the circumference of the tire inflation body 1 so that the connection force is uniform. The second connecting bolts 12 are parallel to the axial direction of the tire inflation body 1, and both ends of the second connecting bolts 12 are respectively fixedly penetrated in the mutual abutment surfaces of the tire inflation body 1 and the outer sleeve 4 to connect and fix the tire inflation body 1 and the outer sleeve 4.

[0019] A core shaft 2 is slidably inserted into the axial middle of the tire expanding body 1 and the outer sleeve 4, and a ring-shaped flange is protrudingly provided on the outer peripheral surface of the core shaft 2. The annular flange is built into the tire expanding body 1 and can slide horizontally for a certain distance, that is, the space where the annular flange is built into the tire expanding body 1 has a certain horizontal sliding stroke to facilitate the clamping or loosening steps of the tire expanding working process. The left end face of the annular flange faces the inner wall of the tire expanding body 1, and the end face of the annular flange is arranged relatively parallel to the end face of the outer sleeve 4 to ensure parallel surface contact during sliding.

[0020] Three guide pins 3 are vertically inserted between the end face of the annular flange and the end face of the outer sleeve 4. The three guide pins 3 are evenly distributed along the circumference of the core shaft 2. The guide pins 3 are parallel to the core shaft 2. Both ends of the guide pins 3 are slidably inserted into the end face of the annular flange and the end face of the outer sleeve 4 respectively. The core shaft 2 is guided by the guide pins 3 to eliminate equipment errors.

[0021] The part of the core shaft 2 that passes through the outer sleeve 4 is composed of a large diameter part and a small diameter part in a two-stage shaft shape from left to right. A compression spring 5, a first bevel 6 and a second bevel 7 are slidably sleeved on the small diameter part from left to right. The two ends of the compression spring 5 elastically abut against the right end face of the large diameter part and the left end face of the first bevel 6 respectively, so that the first bevel 6 and the second bevel 7 can slide elastically along the core shaft 2 when the equipment is driven.

[0022] A first connecting bolt 8 is axially penetrated on the right end face of the core shaft 2, and the first connecting bolt 8 is penetrated to the left in the second inclined block 7 and the first inclined block 6 in sequence, so that the right end outer edge of the first connecting bolt 8 abuts against the right end face of the second inclined block 7, thereby limiting the second inclined block 7 to slide along the core shaft 2.

[0023] The tops of the first inclined block 6 and the second inclined block 7 are respectively provided with inclined surfaces that gradually decrease from left to right, and the first inclined block 6 and the second inclined block 7 have the same inclination. Two notches are respectively vertically opened on the corresponding inclined surfaces on the outer sleeve 4, and a tensioning block 11 is vertically inserted into the notch. The top of the tensioning block 11 is exposed from the notch to tighten the inner cavity of the three-pin fork blank part 13. The bottoms of the two tensioning blocks 11 are inclined surfaces that match the first inclined block 6 and the second inclined block 7 respectively and slide against each other, so that the tensioning block 11 can be vertically extended and retracted when driven externally. A protective cover 9 is matched and fixed on the right end surface of the outer sleeve 4 to play a protective role.

[0024] The outer end surface of the protective cover 9 is evenly protruded and fixed with three positioning pins 10 along the circumferential direction, and the three positioning pins 10 are used to press against the bottom of the inner cavity of the three-pin fork blank part 13 to effectively position it. The inner cavity of the three-pin fork blank part 13 is sleeved from the outside of the protective cover 9 to the right end of the outer sleeve 4 from right to left, and the center hole of the right end surface of the three-pin fork blank part 13 is horizontally abutted with a top 14. The tire expansion body 1 is connected to the main shaft of the driving device, and the core shaft 2 is connected to the cylinder of the driving device. The driving device and the top 14 are respectively connected to the machine tool and the movement is controlled by the machine tool CNC program.

[0025] The basic working process of the present invention is that when the device is working, the cylinder retracts to drive the mandrel 2 to retract, so that the compression spring 5 is loosened, and then the first inclined block 6 and the second inclined block 7 move leftward to loosen the tension block 11. When the inner cavity of the three-pin fork blank part 13 is inserted into the tire expansion clamping part, the bottom of the inner cavity of the three-pin fork blank part is close to the positioning pin 10 to achieve axial positioning, and then the cylinder moves to push the mandrel 2 to the right, and the compression spring 5 is compressed to press the first inclined block 6 and the second inclined block 7, so that the tension block 11 moves up to press the inner wall of the inner cavity of the part 13, playing a radial positioning and clamping role.

[0026] The innovation of the present invention lies in that, when in use, the inner cavity of the three-pin fork blank part 13 is first inserted into the tire expansion and tightening part and clamped. At this time, the accuracy of axial positioning is not considered. Then, the center hole of the right end face of the three-pin fork blank part 13 is tightened with the top point 14. Then the tire expansion clamping device is released. The top point 14 continues to tighten so that the three-pin fork blank part 13 tends to move to the left. If the locating pin 10 does not press the inner cavity of the three-pin fork blank part 13, the top point 14 will bring the locating pin 10 into close contact with the inner cavity of the three-pin fork blank part 13, so as to achieve the purpose of accurate secondary axial positioning. Then the tightening block 11 is tightened again to achieve the effect of radial positioning and clamping.

[0027] The invention has reasonable structural design, and can eliminate manual feeding errors and the situation that the material is not in place and cannot be close to the positioning pin through axial secondary positioning and cooperate with the machine tool CNC program control action, thereby greatly improving the part processing accuracy.

[0028] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

Claims

1. The three-pin fork secondary positioning tire expansion device is characterized by: From left to right, it includes a tire expansion body and a jacket, the tire expansion body and the jacket are coaxially arranged, a core shaft is slidably inserted into the axial middle of the tire expansion body and the jacket, the tire expansion body is connected to the main shaft of the driving device, the core shaft is connected to the cylinder of the driving device, an annular flange is protruding on the outer circumference of the core shaft, the annular flange is built into the tire expansion body and horizontally slidably arranged, the end face of the annular flange is relatively parallel to the end face of the jacket, and the end face of the annular flange is parallel to the outer jacket. Three guide pins are vertically penetrated between the end faces of the sleeve, and the three guide pins are evenly distributed along the circumference of the core shaft. The guide pins are parallel to the core shaft, and the two ends of the guide pins are respectively slidably penetrated in the end face of the annular flange and the end face of the outer sleeve. The part of the core shaft penetrated in the outer sleeve is a two-stage shaft-shaped large diameter part and a small diameter part from left to right. A compression spring, a first inclined block and a second inclined block are slidably sleeved on the small diameter part from left to right, and the two ends of the compression spring are respectively abutted against The locking cam of the second end face of the second cam is secured to the left by the camming member, and the locking cam is secured to the left by the camming member. The bottoms of the two tensioning blocks are inclined surfaces that match the first inclined block and the second inclined block respectively, and the first inclined block and the second inclined block have the same inclination; Three second connecting bolts are vertically penetrated on the abutment surfaces between the tire expanding body and the outer sleeve, and the three second connecting bolts are evenly distributed along the circumference of the tire expanding body. The second connecting bolts are parallel to the axial direction of the tire expanding body, and both ends of the second connecting bolts are respectively fixedly penetrated in the abutment surfaces between the tire expanding body and the outer sleeve.

2. The three-pin fork secondary positioning tire expansion device according to claim 1, characterized in that: The driving device and the center are respectively connected to the machine tool and the movements are controlled by the numerical control program of the machine tool.

3. The three-pin fork secondary positioning tire expansion device according to claim 1, characterized in that: The space in which the annular flange is built into the tire expansion body has a certain horizontal sliding length, and the left end surface of the annular flange faces the inner wall of the tire expansion body.

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