Assembly tool for composite lining of extruder

Abstract

A plurality of sets of lifting openings distributed in an annular array are vertically formed in an upper rotary disc in a penetrating mode, telescopic sleeves are inserted into the lifting openings in a vertical sliding mode, a plurality of supporting arc plates distributed in an annular array are arranged on the upper half portions of the telescopic sleeves, and arc-shaped pressing heads are fixed to the top ends of the supporting arc plates; a driving part is inserted into the telescopic sleeve in an up-down sliding mode, the driving part is connected with the supporting arc plates in a sliding mode, a reset part is installed at the bottom end of the telescopic sleeve, the surface of the outer ring of the telescopic sleeve is sleeved with an inner lining sleeve, and the telescopic sleeve is installed on a fixed die base of the upper rotary disc in an up-down sliding mode; the telescopic sleeve is internally provided with a plurality of supporting arc plates capable of expanding and contracting, an arc-shaped pressing head and a driving part arranged in a matched mode, the supporting arc plates and the arc-shaped pressing head can support and fix the inner wall of the neck bush, the reset part can drive the telescopic sleeve and the supporting arc plates to move downwards together, and the telescopic sleeve moves downwards so that the neck bush can be pulled to be installed in the metal outer sleeve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of press fitting, in particular to an assembly tool for a composite bushing of an extruder. BACKGROUND

[0002] A special material (such as PTFE, copper alloy, etc. composite material) inner bushing is press fitted into the inner hole of the metal sleeve of the extruder, which can significantly reduce the direct friction between the metal sleeve and the moving parts, avoid the shaft biting phenomenon, and is especially suitable for the high temperature and high pressure working environment of the extruder, thereby prolonging the service life of the equipment. At present, when the inner bushing is press fitted into the inner part of the metal sleeve, a fixed mold base is usually made, a cylindrical core shaft (slightly smaller than the inner hole, with a guide chamfer) matching the size of the inner hole of the inner bushing is fixed on the fixed mold base, the inner bushing is inserted onto the cylindrical core shaft during press fitting, and the two are in clearance fit. Then the metal sleeve is sleeved on the cylindrical core shaft, and the inner hole of the metal sleeve is aligned with the outer wall of the inner bushing. Then the metal sleeve is extruded downward by a press machine, so that the inner bushing is inserted into the metal sleeve. Since the metal sleeve and the inner bushing are fixed by interference fit, and the inner bushing has a certain elasticity, after the metal sleeve and the inner bushing are inserted and fixed, the inner hole of the inner bushing will slightly stretch and contract to tightly press the cylindrical core shaft. At this time, when the cylindrical core shaft is removed, a ring is inserted on the cylindrical core shaft, and the ring is in abutment with the upper surface of the inner bushing. Then the cylindrical core shaft is continuously rotated and pulled out, so that the cylindrical core shaft is removed. This way makes it more complicated to remove the cylindrical core shaft, resulting in slow overall press fitting efficiency. SUMMARY

[0003] The present application provides an assembly tool for a composite bushing of an extruder, which solves the above problems.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: An assembly tool for a composite bushing of an extruder, comprising a rack, a table plate is fixed above the rack, a gantry is installed on the rear side above the rack, a pressing mechanism is installed on the gantry, an upper turntable is rotatably installed on the table plate through an annular track and a sliding table, a plurality of groups of fixed mold bases are fixed on the upper turntable in annular array, a limiting hole is formed through the fixed mold base, a metal sleeve is placed in the limiting hole, flanges are arranged at the upper and lower ends of the metal sleeve of the extruder, and the flanges are inserted into the limiting hole, so that the metal sleeve can be limited. The upper rotating disc is provided with a plurality of groups of lifting openings in annular array distribution and penetrating through the upper rotating disc, the lifting openings are located at the center of the limiting holes, an extension sleeve is slidably inserted into the lifting openings, a plurality of support arc plates in annular array distribution are arranged on the upper half of the extension sleeve, arc-shaped pressing heads are fixed to the top ends of the support arc plates, a driving member is slidably inserted into the extension sleeve, the driving member is in sliding connection with the plurality of support arc plates, a reset member is installed at the bottom end of the extension sleeve, an inner sleeve is sleeved on the outer surface of the extension sleeve, the inner diameter of the inner sleeve is larger than the outer diameter of the extension sleeve, and when the support arc plates expand outward, the support arc plates are in close abutment with the inner wall of the inner sleeve.

[0005] Further, the pressing mechanism comprises a hydraulic cylinder fixed above the gantry, two guide holes penetrating through the gantry are formed in the gantry, a push rod of the hydraulic cylinder penetrates through the gantry and is arranged below the gantry, and a pressing block is fixed to the bottom end of the push rod of the hydraulic cylinder, two guide rods are fixed to the pressing block, and the guide rods are slidably inserted into the guide holes.

[0006] Further, the extension sleeve comprises a pulling sleeve slidably inserted into the lifting opening, an extension sleeve is welded above the pulling sleeve, a plurality of arc-shaped holes in annular array distribution are formed in the outer surface of the extension sleeve, the arc-shaped holes are in communication with the inner cavity of the extension sleeve, a plurality of support arc plates are linearly and slidably installed in the plurality of arc-shaped holes respectively, and the height of the arc-shaped holes is higher than the height of the support arc plates.

[0007] Further, the reset member comprises a screw fixed to the bottom end of the pulling sleeve, two openings penetrating through the pulling sleeve are formed in the two ends of the pulling sleeve away from the pulling sleeve, a fixing ring is fixed in each opening, a pulling rod is fixed in each fixing ring, a plurality of circular holes penetrating through the upper rotating disc are formed in the upper rotating disc, the pulling rod penetrates through the circular holes and is arranged above the upper rotating disc, a reset spring is sleeved on the pulling rod, and in a normal state, the upper end of the fixing ring is in contact with the lower surface of the upper rotating disc to limit the pulling rod and determine the maximum height of the pulling rod.

[0008] Further, a circular hole is formed in the table plate, the upper rotating disc is located directly above the circular hole, a lower rotating disc is rotatably installed below the table plate through an annular track and a sliding table, a plurality of pressing holes are formed in the upper rotating disc, the lower end of the pulling rod penetrates through the pressing holes and is arranged below the lower rotating disc, the upper and lower ends of the reset spring are in abutment with the lower surface of the pulling plate and the upper surface of the lower rotating disc respectively, and the reset spring makes the pulling plate and the pulling rod always have a tendency to move upward.

[0009] Furthermore, both the top of the pull sleeve and the extension sleeve are fixed with an inner ring, and a drive rod is slidably inserted between the upper and lower inner rings. The top of the drive rod passes through the upper inner ring and is positioned above the extension sleeve. A pressure ring is fixed to the top of the drive rod. A lifting spring is placed in the inner cavity of the pull sleeve. The upper and lower ends of the lifting spring abut against the upper surface of the lower pull plate and the bottom end of the drive rod, respectively. The lifting spring causes the drive rod to always have an upward tendency.

[0010] Furthermore, a support ring is welded to the top of the outer ring surface of the sleeve. The outer diameter of the support ring is smaller than the inner diameter of the metal sleeve. The support ring can be directly inserted into the metal sleeve. After the multiple arc-shaped pressure heads are fully expanded, they form a complete circular structure. The outer diameter of the circular structure is not smaller than the outer diameter of the inner sleeve. After the arc-shaped pressure heads are expanded, the inner sleeve can be pressed between the support ring and the multiple arc-shaped pressure heads. This can limit the upper and lower ends of the inner sleeve, thereby facilitating the inner sleeve to be pressed downward into the inside of the metal sleeve. The upper turntable has an embedded groove, which is coaxial with the lifting port. The inner diameter of the embedded groove is larger than the outer diameter of the support ring. When the pull sleeve moves downward and retracts, the support ring can be engaged in the embedded groove, so that the inner liner can be completely pressed into the metal outer sleeve.

[0011] Furthermore, a drive plate is welded to the inner side of the supporting arc plate. Guide grooves and drive grooves are provided at both the upper and lower ends of the drive plate. Multiple upright plates arranged in a ring array are provided on both the upper and lower inner rings. Guide pins are provided on the upright plates. The guide pins are slidably inserted into the guide grooves. Multiple drive pins arranged in a ring array are fixed on the outer ring surface of the drive rod through a shaft block. The drive pins are slidably inserted into the drive grooves.

[0012] Furthermore, the end of the guide groove near the drive rod is above the end of the guide groove away from the drive rod. The drive groove includes an inclined moving groove, and the lower end of the moving groove has a vertically downward retaining groove. The height of the end of the moving groove away from the drive rod is higher than the height of the end of the moving groove near the drive rod. When the pressure ring contacts the top of the extension sleeve, the top surface of the pull rod is flush with the top surface of the pressure ring. When the pressure ring contacts the top of the extension sleeve, the lower surface of the pressing block will also contact the top of the pull rod. As the pressing block continues to move downward, it will overcome the spring force of the return spring, causing the entire pull plate, pull rod, and telescopic sleeve to move downward. At this time, the supporting arc plate, return component, telescopic sleeve, and drive component can be regarded as a whole. This whole moves downward together under the action of the pressing block. The positions of the drive rod, drive pin, guide pin, and drive groove on the supporting arc plate remain relatively unchanged. This ensures that the supporting arc plate is always in contact with the inner wall of the inner bushing when the whole moves downward, thereby pulling the inner bushing placed on the telescopic sleeve into the inner wall of the metal outer sleeve, with an interference fit between the two.

[0013] Furthermore, the upper and lower turntables are fixed at their centers by a rotating shaft, and a precision divider is installed inside the frame. The output shaft of the precision divider is fixed to the rotating shaft, and the precision divider causes the upper and lower turntables to rotate synchronously.

[0014] The beneficial effects of this invention are: 1. By setting an upper turntable and a lower turntable on the upper and lower sides of the platform respectively, the fixed mold base of the upper turntable slides and installs the telescopic sleeve. The telescopic sleeve is equipped with multiple support arc plates and arc-shaped pressure heads that can expand and contract. With the help of the set driving components, the support arc plates and arc-shaped pressure heads can support and fix the inner wall of the inner bushing. During pressing, the reset component can drive the telescopic sleeve and the support arc plates to move downward together. The downward movement of the telescopic sleeve pulls the inner bushing into the metal outer sleeve, avoiding the inner bushing from being squeezed and damaged, and facilitating the rapid pressing of the inner bushing. 2. The set support arc plate and arc-shaped pressure head, together with the set driving component, can move closer to each other and away from the inner bushing under the action of the driving component after the pressing is completed. This allows the support arc plate and arc-shaped pressure block to quickly detach from the inner bushing, which facilitates the quick removal of the inner bushing and metal outer sleeve and improves the pressing efficiency. Attached Figure Description

[0015] Figure 1 This is a front view of an assembly tooling for an extruder composite bushing proposed in this invention; Figure 2 This is a front view of an assembly fixture for an extruder composite bushing proposed in this invention. Figure 3 For this Figure 2 A cross-sectional schematic diagram; Figure 4 for Figure 1 A structural diagram of the central platform plate, telescopic sleeve, resetting component, and supporting arc plate; Figure 5 for Figure 4 Exploded view of the middle telescopic sleeve and the lower and upper turntables of the platform; Figure 6 for Figure 5 Schematic diagram of the internal structure of the telescopic sleeve, reset component, and supporting arc plate; Figure 7 for Figure 4 A schematic diagram of the structure of the reset component, drive rod, and telescopic sleeve; Figure 8 for Figure 7 Exploded view of the central support arc plate and drive rod; Figure 9 for Figure 3 Enlarged view of a portion of the image; Figure 10A structural diagram showing the supporting arc plate, guide pin, and drive pin.

[0016] The diagram is labeled as follows: 1. Frame; 11. Platform; 12. Gantry; 2. Pressing mechanism; 21. Hydraulic cylinder; 22. Pressing block; 3. Upper turntable; 31. Embedded groove; 4. Fixed mold base; 41. Limiting hole; 5. Pull sleeve; 501. Inner ring; 502. Guide pin; 503. Support ring; 51. Extension sleeve; 52. Pull rod; 53. Return spring; 54. Pull plate; 6. Support arc plate; 61. Drive rod; 611. Drive pin; 62. Arc-shaped pressure head; 63. Lifting spring; 64. Pressing ring; 65. Drive plate; 651. Guide groove; 652. Holding groove; 653. Moving groove; 7. Metal outer sleeve; 71. Inner bushing; 8. Lower turntable; 81. Rotating shaft; 82. Pressing hole; 9. Precision divider. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Reference Figure 1 - Figure 10 An assembly fixture for an extruder composite bushing includes a frame 1, a platform 11 fixed above the frame 1, a gantry 12 installed on the rear side above the frame 1, a pressing mechanism 2 installed on the gantry 12, an upper turntable 3 rotatably mounted above the platform 11 via a ring track and a slide table, and multiple sets of fixed mold bases 4 arranged in a ring array fixed above the upper turntable 3. The fixed mold bases 4 form limit holes 41 extending vertically, and a metal jacket 7 is placed inside the limit holes 41. Flanges are provided at the upper and lower ends of the metal jacket 7 of the extruder, and the flanges are inserted into the limit holes 41 to limit the movement of the metal jacket 7. The upper turntable 3 has multiple sets of ring-shaped lifting ports arranged vertically. The lifting ports are located at the center of the limiting hole 41. A telescopic sleeve is slidably inserted into the lifting port. The upper half of the telescopic sleeve is provided with multiple ring-shaped support arc plates 6. An arc-shaped pressure head 62 is fixed at the top of the support arc plate 6. A driving component is slidably inserted into the telescopic sleeve. The driving component is slidably connected to the multiple support arc plates 6. A reset component is installed at the bottom of the telescopic sleeve. An inner liner 71 is fitted onto the outer surface of the telescopic sleeve. The inner diameter of the inner liner 71 is larger than the outer diameter of the telescopic sleeve. When the support arc plates 6 expand outward, the support arc plates 6 are tightly abutted against the inner wall of the inner liner.

[0019] Reference Figure 1 , Figure 2The pressing mechanism 2 includes a hydraulic cylinder 21 fixed above the gantry 12. The gantry 12 has two guide holes that extend vertically. The push rod of the hydraulic cylinder 21 passes through the gantry 12 and is positioned below the gantry 12. A pressing block 22 is fixed at the bottom end of the push rod of the hydraulic cylinder 21. Two guide rods are fixed on the pressing block 22. The guide rods slide vertically and are inserted into the guide holes.

[0020] Reference Figure 3 - Figure 9 The telescopic sleeve includes a pull sleeve 5 that slides up and down into the lifting port. An extension sleeve 51 is welded above the pull sleeve 5. Multiple arc-shaped holes are arranged in a ring array on the outer surface of the extension sleeve 51. The arc-shaped holes are connected to the inner cavity of the extension sleeve 51. Multiple support arc plates 6 are linearly slidably installed in the multiple arc-shaped holes, and the height of the arc-shaped holes is higher than the height of the support arc plates 6.

[0021] Reference Figure 6 , Figure 8 , Figure 10 The reset component includes a screw fixed to a pull plate 54 at the bottom of the pull sleeve 5. The two ends of the pull plate 54 away from the pull sleeve 5 are respectively formed with openings extending vertically. A fixing ring is fixed inside the opening, and a pull rod 52 is fixed inside the fixing ring. The upper turntable 3 is formed with multiple round holes extending vertically. The pull rod 52 passes through the round holes and is placed above the upper turntable 3. A reset spring 53 is sleeved on the pull rod 52. Under normal conditions, the upper end of the fixing ring contacts the lower surface of the upper turntable 3 to limit the pull rod 52 and determine the maximum height to which the pull rod 52 rises.

[0022] A circular hole is provided on the platform 11, and the upper turntable 3 is located directly above the circular hole. The lower turntable 8 is mounted below the platform 11 via a ring track and a sliding table. The lower turntable 8 has multiple pressing holes 82. The lower end of the pull rod 52 passes through the pressing holes 82 and is positioned below the lower turntable 8. The upper and lower ends of the return spring 53 abut against the lower surface of the pull plate 54 and the upper surface of the lower turntable 8, respectively. The return spring 53 ensures that the pull plate 54 and the pull rod 52 always have an upward tendency to move.

[0023] Reference Figure 7 - Figure 9 The top of both the pull sleeve 5 and the extension sleeve 51 is fixed with an inner ring 501. A drive rod 61 is slidably inserted between the upper and lower inner rings 501. The top of the drive rod 61 passes through the upper inner ring 501 and is positioned above the extension sleeve 51. A pressure ring 64 is fixed to the top of the drive rod 61. A lifting spring 63 is placed in the inner cavity of the pull sleeve 5. The upper and lower ends of the lifting spring 63 abut against the upper surface of the pull plate 54 and the bottom end of the drive rod 61, respectively. The lifting spring 63 makes the drive rod 61 always have an upward tendency.

[0024] A support ring 503 is welded to the top of the outer ring surface of the sleeve 5. The outer diameter of the support ring 503 is smaller than the inner diameter of the metal outer sleeve 7. The support ring 503 can be directly inserted into the metal outer sleeve 7. After the multiple arc-shaped pressure heads 62 are fully expanded, they form a complete circular structure. The outer diameter of this circular structure is not smaller than the outer diameter of the inner bushing 71. After the arc-shaped pressure heads 62 are expanded, the inner bushing 71 can be pressed between the support ring 503 and the multiple arc-shaped pressure heads 62. The upper and lower ends of the inner bushing 71 can be limited, so that the inner bushing 71 can be pressed downward into the metal outer sleeve 7. An embedding groove 31 is provided on the upper turntable 3. The embedding groove 31 is coaxial with the lifting port, and the inner diameter of the embedding groove 31 is larger than the outer diameter of the support ring 503. When the pull sleeve 5 moves downward and retracts, the support ring 503 can be engaged in the embedding groove 31, so that the inner liner 71 can be completely pressed into the metal outer sleeve 7.

[0025] A drive plate 65 is welded to the inner side of the supporting arc plate 6. The drive plate 65 has guide grooves 651 and drive grooves at both the upper and lower ends. Multiple vertical plates arranged in a ring array are provided on the upper and lower inner rings 501. Guide pins 502 are provided on the vertical plates. The guide pins 502 are slidably inserted into the guide grooves 651. Multiple drive pins 611 arranged in a ring array are fixed on the outer ring surface of the drive rod 61 by a shaft block. The drive pins 611 are slidably inserted into the drive grooves.

[0026] The end of the guide groove 651 near the drive rod 61 is above the end of the guide groove 651 away from the drive rod 61. The drive groove includes an inclined moving groove 653. The lower end of the moving groove 653 is provided with a vertically downward retaining groove 652. The height of the end of the moving groove 653 away from the drive rod 61 is higher than the height of the end of the moving groove 653 near the drive rod 61. In the initial state, the drive pin 611 is located at the top of the moving groove 653, while the guide pin 502 is located at the bottom of the guide groove 651. At this time, the drive rod 61 is at its highest point under the action of the lifting spring 63, and the elastic force of the return spring 53 is greater than that of the lifting spring 63. When the push rod of the hydraulic cylinder 21 pushes the pressing block 22 to move downward, the pressing block 22 will contact the pressure ring 64 after moving down a certain distance. When the pressing block 22 continues to move downward, it will push the pressure ring 64 and the drive rod 61 to move downward together. The downward-moving drive rod 61 will drive multiple drive pins 611 to move downward together. As the drive pin 611 moves downward, it will generate a horizontal component force away from the drive rod 61 through the moving groove 653. The drive pin 611 can thus push multiple support arc plates 6 to move outward synchronously away from the drive rod 61. When the support arc plates 6 move outward, since the drive plate 65 on the support arc plate 6 is slidably connected to the guide pin 502 through the inclined guide groove 651, the support arc plate 6 can only move along the inclined guide groove 651. That is, as the drive rod 61 drives the drive pin 611 to move downward, the support arc plate 6 will move downward along the guide pin 502 away from the drive rod 61. When the pressure ring 64 contacts the top of the extension sleeve 51, the drive pin 611 moves into the retaining groove 652, the position of the support arc plate 6 remains unchanged, and the outer surface of the support arc plate 6 abuts against the inner wall of the inner bushing 71. At the same time, the arc-shaped pressure head 62 located at the top of the support arc plate 6 presses against the top of the inner bushing 71. When the pressure ring 64 contacts the top of the extension sleeve 51, the top surface of the pull rod 52 is flush with the top surface of the pressure ring 64. When the pressure ring 64 contacts the top of the extension sleeve 51, the lower surface of the pressing block 22 will also contact the top of the pull rod 52. Afterwards, as the pressing block 22 continues to move downwards, it will overcome the elastic force of the return spring 53, causing the entire pull plate 54, pull rod 52, and telescopic sleeve to move downwards. At this time, the supporting arc plate 6, the return component, the telescopic sleeve, and the driving component can be regarded as a whole. This whole moves downwards together under the action of the pressing block 22. The positions of the driving rod 61, the driving pin 611, the guide pin 502 on the supporting arc plate 6, and the driving groove remain relatively unchanged. This ensures that when the whole moves downwards, the supporting arc plate 6 is always in contact with the inner wall of the inner bushing 71, thereby causing the inner bushing 71 placed on the telescopic sleeve to be pulled into the inner wall of the metal outer sleeve 7, and the two are interference-fitted.

[0027] The upper turntable 3 and the lower turntable 8 are fixed at their center by a rotating shaft 81, and a precision divider 9 is installed inside the frame 1. The output shaft of the precision divider 9 is fixed to the rotating shaft 81, and the precision divider 9 makes the upper turntable 3 and the lower turntable 8 rotate synchronously.

[0028] Working principle: In the initial state, under the action of the return spring 53, the upper end of the fixed ring above the pull-down plate 54 contacts the lower surface of the upper turntable 3. At this time, the drive pin 611 is located at the top of the moving groove 653, while the guide pin 502 is located at the bottom of the guide groove 651. At this time, the drive rod 61 is at its highest point under the action of the lifting spring 63, and the elastic force of the return spring 53 is greater than that of the lifting spring 63. At this time, the multiple supporting arc plates 6 retract and approach each other, while the multiple arc-shaped pressure heads 62 located at the top of the supporting arc plates 6 approach each other. The outer diameter of the circular structure formed by the multiple arc-shaped pressure heads 62 is smaller than the inner diameter of the inner bushing 71.

[0029] In actual use, the metal jacket 7 is inserted into the top of the telescopic sleeve, and the flange on the metal jacket 7 is inserted into the limiting hole 41 of the fixed mold base 4, so as to limit the metal jacket 7. Then, the inner sleeve 71 is inserted into the cylinder formed by multiple support arc plates 6. The bottom end of the inner sleeve 71 contacts the upper end of the support ring 503. Then, the precision divider 9 causes the upper turntable 3 and the lower turntable 8 to rotate as a whole by a certain angle, so that the fixed mold base 4, which holds the metal jacket 7 and the inner sleeve 71, moves to the bottom of the pressing block 22. Then, the push rod of the hydraulic cylinder 21 pushes the pressing block 22 to move downward. After the pressing block 22 moves down a certain distance, it will contact the pressure ring 64. When the pressing block 22 continues to move downward, it will push the pressure ring 64 and the drive rod 61 to move downward together. The downward-moving drive rod 61 will drive multiple drive pins 611 to move downward together. During the downward movement of the drive pins 611, a horizontal component force away from the drive rod 61 will be generated through the moving groove 653. The drive pins 611 can thus push multiple support arc plates 6 to move outward synchronously away from the drive rod 61. When the support arc plates 6 move outward, since the drive plate 65 on the support arc plate 6 is slidably connected to the guide pin 502 through the inclined guide groove 651, the support arc plate 6 can only move along the inclined guide groove 651. That is, during the process of the drive rod 61 driving the drive pin 611 to move downward, the support arc plate 6 will move downward along the guide pin 502 away from the drive rod 61. When the pressure ring 64 contacts the top of the extension sleeve 51, the drive pin 611 moves into the retaining groove 652, the position of the support arc plate 6 remains unchanged, and the outer surface of the support arc plate 6 abuts against the inner wall of the inner bushing 71. At the same time, the arc-shaped pressure head 62 located at the top of the support arc plate 6 presses against the top of the inner bushing 71. At this time, the multiple support arc plates 6 and the multiple arc-shaped pressure heads 62, together with the support ring 503, can support and fix the inner wall of the inner bushing 71. Since the top surface of the pull rod 52 is flush with the top surface of the pressure ring 64 at this time, when the pressure ring 64 contacts the top of the extension sleeve 51, the lower surface of the pressing block 22 will also contact the top of the pull rod 52. Afterwards, when the pressing block 22 continues to move downwards, the pressing block 22 will overcome the elastic force of the return spring 53, causing the entire pull plate 54, pull rod 52 and telescopic sleeve to move downwards as a whole. At this time, the supporting arc plate 6, the return component, the telescopic sleeve and the driving component can be regarded as a whole. This whole moves downwards together under the action of the pressing block 22. The positions of the driving rod 61, the driving pin 611 and the guide pin 502 and the driving groove on the supporting arc plate 6 remain relatively unchanged. This makes the supporting arc plate 6 always in contact with the inner wall of the inner bushing 71 when the whole moves downwards, so that the inner bushing 71 placed on the telescopic sleeve is pulled into the inner wall of the metal outer sleeve 7. The two are interference-fitted, completing the pressing of the metal outer sleeve 7 and the inner bushing 71.

[0030] Afterwards, the push rod of the hydraulic cylinder 21 retracts, causing the pressing block 22 to move upward. Due to the interference fit between the metal outer sleeve 7 and the inner bushing 71, the normal force between the metal outer sleeve 7 and the inner bushing 71 is greater than the elastic force of the return spring 53. Therefore, during the upward movement of the pressing block 22, the two pull rods 52 remain at the bottom and do not move upward with the pressing block 22. When the pressing block 22 moves upward, the drive rod 61 will move upward and reset under the action of the lifting spring 63. During the upward resetting process, the drive pin 611 on the drive rod 61 will also move upward. The upward-moving drive pin 611 will move along the moving groove 653, thereby causing multiple support arc plates 6 to move inward and approach the drive rod 61 synchronously along the guide pin 502 and the guide groove 651. After the pressing block 22 returns to its original position, the drive rod 61 will also return to its initial position under the action of the lifting spring 63. Multiple supporting arc plates 6 and arc-shaped pressure heads 62 will approach each other obliquely upwards. The supporting arc plates 6 and the inner wall of the inner bushing 71 have a certain distance. The contact supporting arc plates 6, arc-shaped pressure heads 62 and inner bushing 71 are fixed. Then the precision divider 9 makes the upper turntable 3 and lower turntable 8 rotate as a whole at a certain angle, so that they are away from the pressing mechanism 2. Then the pressed metal outer jacket 7 and inner bushing 71 can be removed. When the metal jacket 7 and inner liner 71 are moved upwards and removed, the pull rod 52 and pull plate 54 will drive the support arc plate 6, the reset component, the telescopic sleeve, and the drive component to move upwards together under the action of the return spring 53, returning to the initial state. At this time, the metal jacket 7 and inner liner 71 can be placed again. By repeating the above operation, the pressing of the metal jacket 7 and inner liner 71 can be continuously performed.

[0031] By setting an upper turntable 3 and a lower turntable 8 on the upper and lower sides of the platform 11 respectively, and installing a telescopic sleeve on the fixed mold base 4 of the upper turntable 3, and setting multiple support arc plates 6 and arc-shaped pressure heads 62 that can expand and contract inside the telescopic sleeve, and with the help of the set driving component, the support arc plates 6 and arc-shaped pressure heads 62 can support and fix the inner wall of the inner bushing 71. During pressing, the reset component can drive the telescopic sleeve and the support arc plates 6 to move downward together. The downward movement of the telescopic sleeve causes the inner bushing 71 to be pulled into the metal outer sleeve 7, avoiding the pressing block 22 from directly squeezing the inner bushing 71 and causing it to be squeezed and damaged, thus facilitating the rapid pressing of the inner bushing 71. The supporting arc plate 6 and the arc-shaped pressure head 62, together with the driving component, can move closer to each other and further away from the inner bushing 71 after the pressing is completed. This allows the supporting arc plate 6 and the arc-shaped pressure head 62 to quickly detach from the inner bushing 71, facilitating the rapid removal of the inner bushing 71 and the metal outer sleeve 7, thus improving the pressing efficiency.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An assembly fixture for an extruder composite bushing, characterized in that, Includes a frame (1), a platform (11) fixed above the frame (1), a gantry (12) installed on the rear side above the frame (1), a pressing mechanism (2) installed on the gantry (12), an upper turntable (3) mounted on the platform (11) via a ring track and a sliding table, and multiple sets of fixed mold bases (4) arranged in a ring array fixed above the upper turntable (3), with limit holes (41) formed through the upper and lower parts of the fixed mold bases (4), and a metal jacket (7) placed inside the limit holes (41); The upper turntable (3) has multiple sets of ring array-distributed lifting ports through its upper and lower parts. The lifting ports are located at the center of the limiting hole (41). A telescopic sleeve is slidably inserted into the lifting port. Multiple ring array-distributed support arc plates (6) are provided on the upper half of the telescopic sleeve. An arc-shaped pressure head (62) is fixed at the top of the support arc plate (6). A driving component is slidably inserted into the telescopic sleeve. The driving component is slidably connected to the multiple support arc plates (6). A reset component is installed at the bottom of the telescopic sleeve. An inner liner (71) is sleeved on the outer ring surface of the telescopic sleeve.

2. The assembly tooling for an extruder composite bushing according to claim 1, characterized in that, The pressing mechanism (2) includes a hydraulic cylinder (21) fixed above the gantry (12). The gantry (12) has two guide holes that run through it vertically. The push rod of the hydraulic cylinder (21) passes through the gantry (12) and is placed below the gantry (12). A pressing block (22) is fixed at the bottom of the push rod of the hydraulic cylinder (21). Two guide rods are fixed on the pressing block (22). The guide rods slide vertically and are inserted into the guide holes.

3. The assembly tooling for an extruder composite bushing according to claim 1, characterized in that, The telescopic sleeve includes a pull sleeve (5) that slides up and down into the lifting port. An extension sleeve (51) is welded on the top of the pull sleeve (5). The outer surface of the extension sleeve (51) is provided with a plurality of arc-shaped holes arranged in a ring array. The arc-shaped holes are connected to the inner cavity of the extension sleeve (51). A plurality of supporting arc plates (6) are respectively linearly slidably installed in the plurality of arc-shaped holes, and the height of the arc-shaped holes is higher than the height of the supporting arc plates (6).

4. The assembly tooling for an extruder composite bushing according to claim 3, characterized in that, The reset component includes a screw fixed to a pull plate (54) at the bottom of the pull sleeve (5). The pull plate (54) has openings at both ends away from the pull sleeve (5), and a fixing ring is fixed inside the opening. A pull rod (52) is fixed inside the fixing ring. The upper turntable (3) has multiple round openings at the top and bottom. The pull rod (52) passes through the round holes and is placed above the upper turntable (3). A reset spring (53) is sleeved on the pull rod (52).

5. The assembly tooling for an extruder composite bushing according to claim 4, characterized in that, The platform (11) has a circular hole, the upper turntable (3) is located directly above the circular hole, and the lower turntable (8) is mounted below the platform (11) via a ring track and a sliding table. The lower turntable (8) has multiple pressing holes (82), the lower end of the pull rod (52) passes through the pressing holes (82) and is placed below the lower turntable (8), and the upper and lower ends of the reset spring (53) abut against the lower surface of the pull plate (54) and the upper surface of the lower turntable (8), respectively.

6. The assembly tooling for an extruder composite bushing according to claim 5, characterized in that, The top ends of the pull sleeve (5) and the extension sleeve (51) are fixed with inner rings (501). A drive rod (61) is slidably inserted between the upper and lower inner rings (501). The top end of the drive rod (61) passes through the upper inner ring (501) and is placed above the extension sleeve (51). A pressure ring (64) is fixed at the top end of the drive rod (61). A lifting spring (63) is placed in the inner cavity of the pull sleeve (5). The upper and lower ends of the lifting spring (63) abut against the upper surface of the pull plate (54) and the bottom end of the drive rod (61), respectively.

7. The assembly tooling for an extruder composite bushing according to claim 6, characterized in that, A support ring (503) is welded to the top of the outer ring surface of the sleeve (5). The outer diameter of the support ring (503) is smaller than the inner diameter of the metal jacket (7). After the multiple arc-shaped pressure heads (62) are fully expanded, they form a complete circular structure. The outer diameter of the circular structure is not smaller than the outer diameter of the inner bushing (71). The upper turntable (3) is provided with an embedding groove (31), which is coaxial with the lifting port, and the inner diameter of the embedding groove (31) is greater than the outer diameter of the support ring (503).

8. The assembly tooling for an extruder composite bushing according to claim 7, characterized in that, A drive plate (65) is welded to the inner side of the supporting arc plate (6). The drive plate (65) has guide grooves (651) and drive grooves at both the upper and lower ends. Multiple vertical plates arranged in a ring array are provided on the upper and lower inner rings (501). Guide pins (502) are provided on the vertical plates. The guide pins (502) are slidably inserted into the guide grooves (651). Multiple drive pins (611) arranged in a ring array are fixed on the outer surface of the drive rod (61) by a shaft block. The drive pins (611) are slidably inserted into the drive grooves.

9. The assembly tooling for an extruder composite bushing according to claim 8, characterized in that, The end of the guide groove (651) near the drive rod (61) is above the end of the guide groove (651) away from the drive rod (61). The drive groove includes an inclined moving groove (653). The lower end of the moving groove (653) is provided with a vertically downward retaining groove (652). The height of the end of the moving groove (653) away from the drive rod (61) is higher than the height of the end of the moving groove (653) near the drive rod (61). When the pressure ring (64) contacts the top of the extension sleeve (51), the top surface of the pull rod (52) is flush with the top surface of the pressure ring (64) at this time.

10. The assembly tooling for an extruder composite bushing according to claim 5, characterized in that, The upper turntable (3) and the lower turntable (8) are fixed at their centers by a rotating shaft (81), and a precision divider (9) is installed inside the frame (1). The output shaft of the precision divider (9) is fixed to the rotating shaft (81).

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