A double-headed pipe shrinking and piercing machine and a double-station double-headed pipe shrinking and piercing machine

Abstract

The invention discloses a double-headed tube shrinking drum machine, on which a left tube shrinking device, a clamping device and a right tube shrinking device are arranged in sequence from left to right on a frame; the structure of the left tube shrinking device is as follows: a first die sleeve shaft driven by a first main driving device is movably inserted into a horizontal through hole of a first fixed seat fixedly installed on the frame; a left half of the drum die is fixedly installed at the right end of the first die sleeve shaft; a first material stopper shaft with its right end extending into the left half of the drum die is installed in an inner channel of the first die sleeve shaft; the structure of the right tube shrinking device is as follows: a second die sleeve shaft driven by a second main driving device is movably inserted into a horizontal through hole of a second fixed seat fixedly installed on the frame; a right half of the drum die is fixedly installed at the left end of the second die sleeve shaft; a second material stopper shaft with its left end extending into the right half of the drum die is installed in an inner channel of the second die sleeve shaft. The double-headed tube shrinking drum machine with the above structure is suitable for processing metal pipes with drum-shaped protrusions in the middle.

Description

Technical Field

[0001] The invention relates to a pipe shrinking machine, in particular to a double-head pipe shrinking and piercing machine and a double-station double-head pipe shrinking and piercing machine. Background Art

[0002] With the continuous development of society, the application of metal pipes has also been rapidly developed. Metal pipes of various sizes and shapes are widely used in aerospace, automobile, petrochemical, power system and other fields. In some applications, such as the connection parts of pipe fittings, it is necessary to expand and shrink the end face of the metal pipe. In the mechanical processing industry, the forming process of expanding and shrinking the metal pipe is usually achieved by a shrinking machine. The shrinking machine is a pipe end forming processing equipment that expands and shrinks the end face of the pipe fitting under normal conditions. By replacing the mold on the shrinking machine, the pipe fitting can be expanded, shrunk, bulged, and upset. However, for metal pipes that need to be bulged in the middle, the final forming shape of the bulging part of this type of metal pipe is spherical or elliptical, as shown in 1. For the forming process of this type of target finished metal pipe, there is currently no shrinking machine with a simple structure and easy operation for the forming process of this type of target finished metal pipe on the market. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a double-headed tube shrinking drum machine which has a simple structure, is easy to operate and is suitable for shrinking and drumming metal tubes with drum-shaped protrusions in the middle, and a double-station double-headed tube shrinking drum machine.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: the structure of the double-headed shrinking tube drum machine is as follows: a clamping device is arranged on the frame, a left shrinking tube device is arranged on the frame located on the left side of the clamping device, and a right shrinking tube device is arranged on the frame located on the right side of the clamping device, and the left shrinking tube device and the right shrinking tube device are symmetrically distributed relative to the clamping device; the left shrinking tube device includes: a first fixed seat fixedly mounted on the frame, a first mold sleeve shaft placed in the left and right horizontal directions and movably inserted into the horizontal through hole of the first fixed seat, and the first mold sleeve shaft is driven by the first main driving device to move horizontally to the left or right relative to the first fixed seat; a left half of the drum mold is fixedly mounted on the right end of the first mold sleeve shaft, and the mold cavity of the left half of the drum membrane consists of a first cylindrical mold cavity located on the left and a first cylindrical mold cavity connected to the first cylindrical mold cavity and a first half-drum-shaped mold cavity located on the right side; a first material-blocking shaft is installed in the inner channel of the first mold sleeve shaft, and the right end of the first material-blocking shaft extends into the first cylindrical mold cavity of the left half of the pier drum mold; the right tube shrinking device comprises: a second fixed seat fixedly installed on the frame, a second mold sleeve shaft placed in the left and right horizontal directions and movably inserted into the horizontal through hole of the second fixed seat, and the second mold sleeve shaft is driven by the second main driving device to move horizontally to the left or right relative to the second fixed seat; the right half of the pier drum mold is fixedly installed on the left end of the second mold sleeve shaft, and the mold cavity of the right half of the pier drum membrane is composed of the second half-drum-shaped mold cavity located on the left side and the second cylindrical mold cavity connected with the second half-drum-shaped mold cavity and located on the right side; a second material-blocking shaft is installed in the inner channel of the second mold sleeve shaft, and the left end of the second material-blocking shaft extends into the second cylindrical mold cavity of the right half of the pier drum mold. During the tube shrinking and drumming operation, under the drive of the first main driving device and the second main driving device, the left half of the drum membrane and the right half of the drum mold move toward each other until the two are molded together, and then the mold cavity of the left half of the drum membrane located at the right end of the first material blocking shaft and the mold cavity of the right half of the drum membrane located at the left end of the second material blocking shaft form a complete tube shrinking and drumming mold cavity that completely matches the outer contour of the target finished metal pipe.

[0005] Driven by the first main driving device and the second main driving device, during the divergent movement of the left half pier drum membrane and the right half pier drum mold, in order to facilitate the smooth escape of the finished pipe after the tube shrinking pier drum processing from the mold cavity of the left half pier drum membrane and the mold cavity of the right half pier drum mold, this scheme provides a left long through groove penetrating the side wall of the first mold sleeve shaft on the outer circumferential side wall of the first mold sleeve shaft, the long side of the left long through groove is arranged in the horizontal direction left and right, and a left pin shaft extending into the left long through groove is fixedly arranged on the first material blocking shaft; a right long through groove penetrating the side wall of the second mold sleeve shaft is provided on the outer circumferential side wall of the second mold sleeve shaft, the long side of the right long through groove is arranged in the horizontal direction left and right, and a right pin shaft extending into the right long through groove is fixedly arranged on the second material blocking shaft.

[0006] In this solution, the left long through groove and the right long through groove preferably adopt a double round head long through groove structure, and the left pin shaft and the right pin shaft also preferably adopt a cylindrical structure.

[0007] The number of the left long through slot can be set to one, and the number of the left pin is also set to one. Similarly, the number of the right long through slot can be set to one, and the number of the right pin is also set to one.

[0008] Of course, the number of the left long through-slot can be set to two: the first left long through-slot and the second left long through-slot, the first left long through-slot and the second left long through-slot are arranged on the front and rear sides of the vertical axis plane of the first mold sleeve shaft; at this time, the number of the left pins is also correspondingly set to two: the first left pin and the second left pin, the first left pin extends into the first left long through-slot, and the second left pin extends into the second left long through-slot. Similarly, the number of the right long through-slot can be set to two: the first right long through-slot and the second right long through-slot, the first right long through-slot and the second right long through-slot are arranged on the front and rear sides of the vertical axis plane of the second mold sleeve shaft; at this time, the number of the right pins is also correspondingly set to two: the first right pin and the second right pin, the first right pin extends into the first right long through-slot, and the second right pin extends into the second right long through-slot. In the present embodiment, the positions of the first left elongated through groove and the second left elongated through groove are preferably selected to be symmetrical relative to the horizontal axis plane of the first mold sleeve shaft and also symmetrical relative to the vertical axis plane of the first mold sleeve shaft. Similarly, the positions of the first right elongated through groove and the second right elongated through groove are preferably selected to be symmetrical relative to the horizontal axis plane of the second mold sleeve shaft and also symmetrical relative to the vertical axis plane of the second mold sleeve shaft.

[0009] Furthermore, in the aforementioned double-headed shrinking drum machine, the structure of the first main drive device is as follows: the cylinder body of the first main oil cylinder is fixedly mounted on the first fixed seat, and the cylinder body of the first main oil cylinder is located on the left side of the first mold sleeve shaft; the extension rod of the first main oil cylinder points horizontally to the right, and the extension rod of the first main oil cylinder is fixedly connected to the first mold sleeve shaft; the structure of the second main drive device is as follows: the cylinder body of the second main oil cylinder is fixedly mounted on the second fixed seat, and the cylinder body of the second main oil cylinder is located on the right side of the second mold sleeve shaft; the extension rod of the second main oil cylinder points horizontally to the left, and the extension rod of the second main oil cylinder is fixedly connected to the second mold sleeve shaft. In the process of the extension rods of the first master oil cylinder and the second master oil cylinder extending outward at the same time, the left half of the drum membrane and the right half of the drum mold move towards each other, and the two gradually approach each other. On the contrary, in the process of the extension rods of the first master oil cylinder and the second master oil cylinder retracting inward at the same time, the left half of the drum membrane and the right half of the drum mold move away from each other, and the two gradually move away from each other.

[0010] In this solution, an upper pull rod and a lower pull rod are arranged between the first fixed seat and the second fixed seat, the left end of the upper pull rod is fixedly connected to the first fixed seat above the first mold sleeve shaft, the right end of the upper pull rod is fixedly connected to the second fixed seat above the second mold sleeve shaft, the left end of the lower pull rod is fixedly connected to the first fixed seat below the first mold sleeve shaft, and the right end of the lower pull rod is fixedly connected to the second fixed seat below the second mold sleeve shaft, and the upper pull rod and the lower pull rod are parallel to the axis of the first mold sleeve shaft and the axis of the second mold sleeve shaft to improve the strength of the overall structure, thereby improving the service life of the double-head shrinking tube pier machine and reducing the use cost.

[0011] Furthermore, in the aforementioned double-headed shrinking tube drum machine, the structure of the clamping device includes: a supporting cylinder and a clamping cylinder; the cylinder body of the supporting cylinder is fixedly installed below the first mold sleeve shaft and the second mold sleeve shaft, the extension rod of the supporting cylinder points upward, a supporting block is fixedly installed at the top end of the extension rod of the supporting cylinder, and a first clamping port is arranged on the top surface of the supporting block; the cylinder body of the clamping cylinder is fixedly installed above the first mold sleeve shaft and the second mold sleeve shaft, the extension rod of the clamping cylinder points downward, a clamping block is fixedly installed at the bottom end of the extension rod of the clamping cylinder, and a second clamping port is arranged on the bottom surface of the clamping block.

[0012] The double-station double-headed shrinking drum machine using the above-mentioned structure includes: two double-headed shrinking drum machines installed on the frame from front to back at intervals. For the convenience of description, the double-headed shrinking drum machine located in the front is defined as the front double-headed shrinking drum machine, and the double-headed shrinking drum machine located in the rear is defined as the rear double-headed shrinking drum machine. A loading rack is installed on the frame in front of the front double-headed shrinking drum machine, and the loading rack is gradually tilted downward from front to back; a unloading rack is installed on the frame behind the rear double-headed shrinking drum machine, and the unloading rack is gradually tilted downward from front to back; a pipe transfer assembly is provided on the frame between the loading rack and the unloading rack, which transports the metal pipes to be processed output from the loading rack to at least one double-headed shrinking drum machine, and transports the finished metal pipes after shrinking drum processing to the unloading rack.

[0013] The number of pipe transfer assemblies is usually set to two, and the two pipe transfer assemblies are arranged on the left and right sides of two double-head pipe shrinking and piercing machines. The structure of the pipe transfer assembly described in this scheme is as follows: the cylinder body of the vertical oil cylinder is fixedly installed on the frame, the extension rod of the vertical oil cylinder points upward, and the mold changing seat is fixedly installed on the top of the extension rod of the vertical oil cylinder; the cylinder body of the mold changing oil cylinder is fixedly installed on the mold changing seat, the extension rod of the mold changing oil cylinder points backward, and the pipe transfer seat is fixedly installed on the rear end of the extension rod of the mold changing oil cylinder, and three shelf grooves are spaced from front to back on the top surface of the pipe transfer seat.

[0014] In this solution, in order to enable the mold changing seat to move upward or downward more smoothly, a guide column structure is provided between the mold changing seat and the frame of each tube transfer assembly, and the guide column structure includes at least two guide columns, each of which is vertically movable and inserted into the corresponding guide hole with a guide sleeve on the frame, the top of each guide column extending from above the corresponding guide sleeve is fixedly connected to the mold changing seat, and the bottom of each guide column extending from below the corresponding guide sleeve is fixedly connected to the bottom plate.

[0015] The beneficial effects of the present invention are as follows: the double-headed tube shrinking and drumming machine described in this scheme has a simple structure, is simple and convenient to operate, and is suitable for tube shrinking and drumming processing of metal tubes with drum-shaped protrusions in the middle. The forming effect of the metal tubes with drum-shaped protrusions in the middle after processing is very good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a metal pipe with a drum-shaped protrusion in the middle.

[0017] Figure 2 The invention discloses a structural schematic diagram of a double-headed shrinking pipe pier machine.

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure of the tube reduction device on the middle left.

[0019] Figure 4 yes Figure 3 Schematic diagram of the local enlarged structure of part A.

[0020] Figure 5 It is a schematic diagram of the structure of the right tube reduction device.

[0021] Figure 6 yes Figure 5 Schematic diagram of the local enlarged structure of part B.

[0022] Figure 7 yes Figure 2 Schematic diagram of the local enlarged structure in.

[0023] Figure 8 It is a structural diagram of a double-station double-head shrinking and piercing machine. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0025] Embodiment 1

[0026] This embodiment is a double-headed tube shrinking and bulging machine designed for the purpose of shrinking and bulging metal tubes with drum-shaped protrusions in the middle. The metal tube 10 with drum-shaped protrusions 100 in the middle, that is, the shape of the target finished metal tube is as follows: Figure 1 As shown. Figure 2 As shown, the structure of a double-headed tube shrinking drum machine described in this embodiment is as follows: a clamping device 2 is arranged on a frame 1, a left tube shrinking device 3 is arranged on the frame 1 located on the left side of the clamping device 2, and a right tube shrinking device 4 is arranged on the frame 1 located on the right side of the clamping device 2, and the left tube shrinking device 3 and the right tube shrinking device 4 are symmetrically distributed relative to the clamping device 2.

[0027] For the convenience of description, Figure 2 The directions of "left", "right", "front", "back", "up" and "down" are defined based on the location of the product. All directions involved in this plan are based on Figure 2 The directions shown are primary.

[0028] like Figure 2 and Figure 3 As shown, the left tube shrinking device 3 described in this embodiment includes: a first fixed seat 31 fixedly mounted on the frame 1, a first die sleeve shaft 32 placed in the horizontal direction of the left and right and movably inserted into the horizontal through hole of the first fixed seat 31, and the first die sleeve shaft 32 is driven by the first main driving device to move horizontally to the left or right relative to the first fixed seat 31. It should be noted that the first main driving device can adopt a variety of known driving structures, as long as it can drive the first die sleeve shaft 32 to move horizontally to the left or right relative to the first fixed seat 31. One driving structure given in this scheme is to use a cylinder drive, specifically: the cylinder body of the first main oil cylinder 33 is fixedly mounted on the first fixed seat 31, and the cylinder body of the first main oil cylinder 33 is located to the left of the first die sleeve shaft 32. The extension rod of the first main oil cylinder 33 points horizontally to the right, and the extension rod of the first main oil cylinder 33 is fixedly connected to the first die sleeve shaft 32. At this time, the extension and retraction movement path of the extension rod of the first main oil cylinder 33 is parallel to the axis of the first die sleeve shaft 32.

[0029] like Figure 3 and Figure 4 As shown, a left half drum mold 5 is fixedly installed at the right end of the first mold sleeve shaft 32, and a mold cavity 51 of the left half drum membrane is composed of a first cylindrical mold cavity 52 located on the left side and a first half drum mold cavity 53 connected to the first cylindrical mold cavity 52 and located on the right side. A first material stopper shaft 6 is installed in the inner channel of the first mold sleeve shaft 32, and the right end of the first material stopper shaft 6 extends into the first cylindrical mold cavity 52 of the left half drum mold 5.

[0030] like Figure 2 and Figure 5As shown, the right tube shrinking device 4 described in this embodiment includes: a second fixed seat 41 fixedly mounted on the frame 1, a second die sleeve shaft 42 placed in the horizontal direction of the left and right and movably inserted into the horizontal through hole of the second fixed seat 41, and the second die sleeve shaft 42 is driven by the second main driving device to move horizontally to the left or right relative to the second fixed seat 41. Similarly, the second main driving device can also adopt a variety of known driving structures, as long as it can drive the second die sleeve shaft 42 to move horizontally to the left or right relative to the second fixed seat 41. One driving structure given in this scheme is to use a cylinder drive, specifically: the cylinder body of the second main oil cylinder 43 is fixedly mounted on the second fixed seat 41, and the cylinder body of the second main oil cylinder 43 is located to the right of the second die sleeve shaft 42. The extension rod of the second main oil cylinder 43 points horizontally to the left, and the extension rod of the second main oil cylinder 43 is fixedly connected to the second die sleeve shaft 42. At this time, the extension and retraction movement path of the extension rod of the second main oil cylinder 43 is parallel to the axis of the second die sleeve shaft 42.

[0031] like Figure 5 and Figure 6 As shown, a right half drum mold 7 is fixedly installed at the left end of the second mold sleeve shaft 42, and a mold cavity 71 of the right half drum membrane is composed of a second half drum-shaped mold cavity 72 located on the left and a second cylindrical mold cavity 73 connected to the second half drum-shaped mold cavity 72 and located on the right. A second material stopper shaft 8 is installed in the inner channel of the second mold sleeve shaft 42, and the left end of the second material stopper shaft 8 extends into the second cylindrical mold cavity 73 of the right half drum mold 7.

[0032] During the shrinking drum operation, driven by the first main driving device and the second main driving device, the extension rods of the first main oil cylinder 33 and the second main oil cylinder 43 are simultaneously extended outward, driving the left half of the drum membrane 5 and the right half of the drum mold 7 to move toward each other. When the left half of the drum membrane 5 and the right half of the drum mold 7 move toward each other until the two are molded together, the mold cavity of the left half of the drum membrane located at the right end of the first blocking shaft 6 and the mold cavity of the right half of the drum membrane located at the left end of the second blocking shaft 8 form a complete shrinking drum mold cavity 57 that fully matches the outer contour of the target finished metal pipe, see Figure 7 On the contrary, driven by the first main driving device and the second main driving device, the extension rods of the first main oil cylinder 33 and the second main oil cylinder 43 are retracted inward at the same time, driving the left half drum membrane 5 and the right half drum mold 7 to move away from each other, and at this time, the left half drum membrane 5 and the right half drum mold 7 gradually move away from each other.

[0033] like Figure 2 and Figure 7As shown, the structure of the clamping device 2 described in this embodiment includes: a supporting cylinder 21 and a clamping cylinder 23; the cylinder body of the supporting cylinder 21 is fixedly installed below the first die sleeve shaft 32 and the second die sleeve shaft 42, the extension rod of the supporting cylinder 21 points upward, a supporting block 22 is fixedly installed at the top of the extension rod of the supporting cylinder 21, and a first clamping opening is provided on the top surface of the supporting block 22. The cylinder body of the clamping cylinder 23 is fixedly installed above the first die sleeve shaft 32 and the second die sleeve shaft 42, the extension rod of the clamping cylinder 23 points downward, a clamping block 24 is fixedly installed at the bottom of the extension rod of the clamping cylinder 23, and a second clamping opening is provided on the bottom surface of the clamping block 24.

[0034] Under the drive of the first main driving device and the second main driving device, the left half drum membrane 5 and the right half drum mold 7 move away from each other, so as to facilitate the metal pipe formed by the shrinking drum processing to smoothly escape from the mold cavity 51 of the left half drum membrane and the mold cavity 71 of the right half drum mold. Figure 3 and Figure 5 As shown, in this solution, a left long slot 321 penetrating the side wall of the first die sleeve shaft 32 is provided on the outer circumferential side wall, the long side of the left long slot 321 is arranged in the horizontal direction, and a left pin 61 extending into the left long slot 321 is fixedly arranged on the first material stopper shaft 6. Similarly, a right long slot 421 penetrating the side wall of the second die sleeve shaft 42 is provided on the outer circumferential side wall, the long side of the right long slot 421 is arranged in the horizontal direction, and a right pin 81 extending into the right long slot 421 is fixedly arranged on the second material stopper shaft 8.

[0035] In this solution, the left long through groove 321 and the right long through groove 421 preferably adopt a double round head long through groove structure, and the left pin shaft 61 and the right pin shaft 81 also preferably adopt a cylindrical structure.

[0036] When the shrinking drum operation begins, the extension rods of the first main oil cylinder 33 and the second main oil cylinder 43 extend outward at the same time, driving the left half drum membrane 5 and the right half drum mold 7 to move toward each other: when the left long slot 321 moves to the right with the first mold sleeve shaft 32, the first material stopper shaft 6 is in a static state before the left end contour of the left long slot 321 touches the left pin 61. When the left long slot 321 moves to the right with the first mold sleeve shaft 32 until the left end contour of the left long slot 321 touches the left pin 61, as the first mold sleeve shaft 32 continues to move to the right, the left pin 61 is pushed to the right by the left end contour of the left long slot 321, driving the first material stopper shaft 6 to move to the right synchronously. Similarly, when the right long slot 421 moves to the left along with the second die sleeve shaft 42, the second material stopper shaft 8 is in a stationary state before the right end contour of the right long slot 421 touches the right pin 81. When the right long slot 421 moves to the left along with the second die sleeve shaft 42 until the right end contour of the right long slot 421 touches the right pin 81, as the second die sleeve shaft 42 continues to move to the left, the right end contour of the right long slot 421 pushes the right pin 81 to move to the left, driving the second material stopper shaft 8 to move to the left synchronously.

[0037] After the shrinkage drum is completed, the extending rods of the first master oil cylinder 33 and the second master oil cylinder 43 are retracted inward at the same time, driving the left half drum membrane 5 and the right half drum mold 7 to move away from each other: when in the mold closing state, the left pin shaft 61 is located at the left end contour of the left long through groove 321. When the left long through groove 321 moves to the left with the first mold sleeve shaft 32 in the initial stage, the left pin shaft 61 does not touch the right end contour of the left long through groove 321, so the first material blocking shaft 6 is in a static state, and the left half drum membrane 5 moves to the left with the first mold sleeve shaft 32. At this time, the first material blocking shaft 6 is equivalent to moving to the right relative to the left half drum membrane 5, pushing the left end of the metal pipe after the shrinkage drum is formed to the right, that is, the metal pipe after the shrinkage drum is formed is gradually pushed to the right from the mold cavity 51 of the left half drum membrane. Until the left pin 61 touches the right end contour of the left long slot 321, as the first mold sleeve shaft 32 continues to move to the left, the right end contour of the left long slot 321 pushes the left pin 61 to move to the left, and then drives the first material stop shaft 6 to move to the left synchronously. Similarly, when in the mold closing state, the right pin 81 is located at the right end contour of the right long slot 421. When the right long slot 421 moves to the right with the second mold sleeve shaft 42 in the initial stage, the right pin 81 does not touch the left end contour of the right long slot 421, so the second material stop shaft 8 is in a static state, and the right half pier drum membrane 7 moves to the right with the second mold sleeve shaft 42. At this time, the second material stop shaft 8 is equivalent to the right half pier drum membrane 7 moving to the left, pushing the right end of the metal pipe after the shrink tube pier drum is processed to the left, that is, the metal pipe after the shrink tube pier drum is processed to the left is gradually pushed out from the mold cavity 71 of the right half pier drum membrane. Until the right pin shaft 81 touches the left end contour of the right long through groove 421, as the second mold sleeve shaft 42 continues to move leftward, the left end contour of the right long through groove 321 pushes the right pin shaft 81 to move rightward, and then drives the second material blocking shaft 8 to move rightward synchronously.

[0038] The number of the left long through slots 321 can be set to one, and in this case, the number of the left pin shaft 61 is also set to one. Similarly, the number of the right long through slots 421 can be set to one, and in this case, the number of the right pin shaft 81 is also set to one. Of course, the number of the left long through slots 321 can be set to two: a first left long through slot and a second left long through slot, and the first left long through slot and the second left long through slot are arranged on the front and rear sides of the vertical axis plane of the first mold sleeve shaft 32; in this case, the number of the left pin shaft 61 is also set to two: a first left pin shaft and a second left pin shaft, and the first left pin shaft extends into the first left long through slot, and the second left pin shaft extends into the second left long through slot. Similarly, the number of the right elongated through grooves 421 can be set to two: a first right elongated through groove and a second right elongated through groove, the first right elongated through groove and the second right elongated through groove are respectively arranged on the front and rear sides of the vertical axis plane of the second mold sleeve shaft 42; at this time, the number of the right pin shafts 81 is also correspondingly set to two: a first right pin shaft and a second right pin shaft, the first right pin shaft extends into the first right elongated through groove, and the second right pin shaft extends into the second right elongated through groove.

[0039] Among them, the positions of the first left long through groove and the second left long through groove are preferably such that the center planes corresponding to them are always located on the same axial plane of the first die sleeve shaft 32. The best solution is that the positions of the first left long through groove and the second left long through groove are preferably selected to be symmetrical with respect to the horizontal axial plane of the first die sleeve shaft 32, and are also symmetrical with respect to the vertical axial plane of the first die sleeve shaft 32. Similarly, the positions of the first right long through groove and the second right long through groove are preferably such that the center planes corresponding to them are always located on the same axial plane of the second die sleeve shaft 42. The best solution is that the positions of the first right long through groove and the second right long through groove are preferably selected to be symmetrical with respect to the horizontal axial plane of the second die sleeve shaft 42, and are also symmetrical with respect to the vertical axial plane of the second die sleeve shaft 42.

[0040] In this scheme, if Figure 2 As shown, an upper tie rod 91 and a lower tie rod 92 are provided between the first fixed seat 31 and the second fixed seat 41, the left end of the upper tie rod 91 is fixedly connected to the first fixed seat 31 above the first die sleeve shaft 32, and the right end of the upper tie rod 91 is fixedly connected to the second fixed seat 41 above the second die sleeve shaft 42. The left end of the lower tie rod 92 is fixedly connected to the first fixed seat 31 below the first die sleeve shaft 32, and the right end of the lower tie rod 92 is fixedly connected to the second fixed seat 41 below the second die sleeve shaft 42. The upper tie rod 91 and the lower tie rod 92 are parallel to the axis of the first die sleeve shaft 32 and the axis of the second die sleeve shaft 42 to improve the overall strength, thereby improving the service life of the double-headed shrink tube pier machine and reducing the use cost.

[0041] The double-head tube shrinking and drumming machine of the above structure is simple in structure, easy and convenient to operate, and is suitable for tube shrinking and drumming processing of metal tubes with drum-shaped protrusions in the middle. The forming effect of the processed metal tubes with drum-shaped protrusions in the middle is very good.

[0042] Embodiment 2

[0043] Two double-head shrinking and piercing machines arranged in parallel can form a double-station double-head shrinking and piercing machine. Figure 8 As shown, in order to further improve the efficiency of the shrink tube drum forming process. For the convenience of description, the double-head shrink tube drum machine located in the front is defined as the front double-head shrink tube drum machine 101, and the double-head shrink tube drum machine located in the rear is defined as the rear double-head shrink tube drum machine 102. A loading rack 200 is installed on the frame 1 in front of the front double-head shrink tube drum machine 101, and the loading rack 200 is gradually tilted downward from front to back. A unloading rack 300 is installed on the frame 1 behind the rear double-head shrink tube drum machine 102, and the unloading rack 300 is gradually tilted downward from front to back. A pipe transfer assembly is provided on the frame 1 between the loading rack 200 and the unloading rack 300, which transports the metal pipes to be processed output from the loading rack 200 to at least one double-head shrink tube drum machine, and transports the finished metal pipes after the shrink tube drum is processed and formed to the unloading rack 300.

[0044] The number of pipe transfer assemblies is preferably two, and the two pipe transfer assemblies are arranged on the left and right sides of the two double-head pipe shrinking and piercing machines. Figure 8 As shown, the structure of the pipe transfer assembly described in this embodiment is as follows: the cylinder body of the vertical oil cylinder 400 is fixedly mounted on the frame 1, the extension rod of the vertical oil cylinder 400 points upward, and the mold changing seat 500 is fixedly mounted on the top of the extension rod of the vertical oil cylinder 400; the cylinder body of the mold changing oil cylinder 600 is fixedly mounted on the mold changing oil cylinder 500, the extension rod of the mold changing oil cylinder 600 points backward, and the pipe transfer seat 700 is fixedly mounted on the rear end of the extension rod of the mold changing oil cylinder 600, and three shelf grooves 701 are spaced from front to back on the top surface of the pipe transfer seat 700. In order to enable the pipe transfer seat 700 to move forward or backward more smoothly under the drive of the mold changing oil cylinder 600, a front-to-back horizontal sliding device, such as a guide rail slider structure, can be set between the pipe transfer seat 700 and the mold changing seat 500.

[0045] For metal pipes that can be processed by only one shrinking and pier forming process, the front double-head shrinking and pier machine 101 and the rear double-head shrinking and pier machine 102 can realize two stations to process the same batch of metal pipes together. At this time, the shrinking and pier mold cavity in the front double-head shrinking and pier machine 101 and the shrinking and pier mold cavity in the rear double-head shrinking and pier machine 102 are exactly the same in size and shape. During operation, through the mutual cooperation of the vertical cylinder 400 and the mold changing cylinder 600, the two metal pipes to be processed output from the loading rack 200 are respectively transported to the front double-head shrinking and pier machine 101 and the rear double-head shrinking and pier machine 102. After the shrinking and pier forming is completed, the finished metal pipes in the front double-head shrinking and pier machine 101 and the rear double-head shrinking and pier machine 102 are transported to the unloading rack 300.

[0046] For metal pipes that need to be processed by secondary shrinking and bulging, the front double-head shrinking and bulging machine 101 performs the front shrinking and bulging process, and the rear double-head shrinking and bulging machine 102 performs the rear shrinking and bulging process. At this time, the shrinking and bulging mold cavity in the front double-head shrinking and bulging machine 101 is smaller than the shrinking and bulging mold cavity in the rear double-head shrinking and bulging machine 102. During operation, through the cooperation of the vertical cylinder 400 and the mold changing cylinder 600, a metal pipe to be processed output from the loading rack 200 is transported to the front double-head shrinking and bulging machine 101, and the semi-finished metal pipe after the front shrinking and bulging process in the front double-head shrinking and bulging machine 101 is transported to the rear double-head shrinking and bulging machine 102, and the finished metal pipe after the rear shrinking and bulging process in the rear double-head shrinking and bulging machine 102 is transported to the unloading rack 300.

[0047] In order to enable the mold changing base 500 to move upward or downward more smoothly, a guide column structure is provided between the mold changing base 500 and the frame 1 of each pipe transfer assembly, and the guide column structure includes at least two guide columns 800, each guide column 800 is vertically movable and inserted into the corresponding guide hole with the guide sleeve 11 on the frame 1, and the top of each guide column 800 extending from the top of the corresponding guide sleeve 11 is fixedly connected to the mold changing base 500, and the bottom of each guide column 800 extending from the bottom of the corresponding guide sleeve 11 is fixedly connected to the bottom plate 900.

[0048] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A double-head shrinking drum machine, comprising: The frame is characterized in that: a clamping device is arranged on the frame, a left tube shrinking device is arranged on the frame located on the left side of the clamping device, and a right tube shrinking device is arranged on the frame located on the right side of the clamping device, and the left tube shrinking device and the right tube shrinking device are symmetrically distributed relative to the clamping device; the left tube shrinking device comprises: a first fixed seat fixedly mounted on the frame, a first mold sleeve shaft placed in the left and right horizontal directions movably inserted into the horizontal through hole of the first fixed seat, and the first mold sleeve shaft is driven by the first main driving device to move horizontally to the left or right relative to the first fixed seat; a left half drum mold is fixedly mounted on the right end of the first mold sleeve shaft, and the mold cavity of the left half drum membrane is composed of a first cylindrical mold cavity located on the left side and a first half drum-shaped mold cavity connected to the first cylindrical mold cavity and located on the right side; a first material stopping shaft is installed in the inner channel of the first mold sleeve shaft, and the right end of the first material stopping shaft extends into the first cylindrical mold cavity of the left half drum mold. The right tube shrinking device comprises: a second fixed seat fixedly mounted on the frame, a second die sleeve shaft placed in the horizontal direction of left and right and movably inserted in the horizontal through hole of the second fixed seat, and the second die sleeve shaft is driven by the second main driving device to move horizontally to the left or right relative to the second fixed seat; a right half pier drum mold is fixedly mounted on the left end of the second die sleeve shaft, and the mold cavity of the right half pier drum membrane is composed of a second half drum-shaped mold cavity located on the left side and a second cylindrical mold cavity connected to the second half drum-shaped mold cavity and located on the right side; a second material blocking shaft is installed in the inner channel of the second die sleeve shaft, and the left end of the second material blocking shaft extends into the second cylindrical mold cavity of the right half pier drum mold; under the drive of the first main driving device and the second main driving device, the left half pier drum mold and the right half pier drum mold move towards each other until the two are molded together, and the mold cavity of the left half pier drum membrane and the mold cavity of the right half pier drum membrane constitute a complete tube shrinking pier drum mold cavity that matches the outer contour of the target finished metal pipe.

2. A double-head shrinking and piercing machine according to claim 1, characterized in that: A left elongated through groove penetrating the side wall of the first mold sleeve shaft is provided on the outer circumferential side wall of the first mold sleeve shaft, the long side of the left elongated through groove is arranged in the horizontal direction left and right, and a left pin shaft extending into the left elongated through groove is fixedly arranged on the first material blocking shaft; a right elongated through groove penetrating the side wall of the second mold sleeve shaft is provided on the outer circumferential side wall of the second mold sleeve shaft, the long side of the right elongated through groove is arranged in the horizontal direction left and right, and a right pin shaft extending into the right elongated through groove is fixedly arranged on the second material blocking shaft.

3. A double-head shrinking and piercing machine according to claim 1, characterized in that: A first left elongated through slot and a second left elongated through slot are provided on the outer circumferential side wall of the first mold sleeve shaft, and the long sides of the first left elongated through slot and the second left elongated through slot are arranged in the left and right horizontal directions, and the first left elongated through slot and the second left elongated through slot are respectively arranged on the front and rear sides of the vertical axis plane of the first mold sleeve shaft; a first left pin shaft extending into the first left elongated through slot and a second left pin shaft extending into the second left elongated through slot are fixedly provided on the first material stopping shaft; a first right elongated through slot and a second right elongated through slot are provided on the outer circumferential side wall of the second mold sleeve shaft, and the long sides of the first right elongated through slot and the second right elongated through slot are respectively arranged in the left and right horizontal directions, and the first right elongated through slot and the second right elongated through slot are respectively arranged on the front and rear sides of the vertical axis plane of the second mold sleeve shaft; a first right pin shaft extending into the first right elongated through slot and a second right pin shaft extending into the second right elongated through slot are fixedly provided on the second material stopping shaft.

4. A double-headed shrinking and tamping machine according to claim 1, 2 or 3, characterized in that: The structure of the first main driving device is as follows: the cylinder body of the first master cylinder is fixedly installed on the first fixed seat, and the cylinder body of the first master cylinder is located on the left side of the first mold sleeve shaft; the extension rod of the first master cylinder points horizontally to the right, and the extension rod of the first master cylinder is fixedly connected to the first mold sleeve shaft; the structure of the second main driving device is as follows: the cylinder body of the second master cylinder is fixedly installed on the second fixed seat, and the cylinder body of the second master cylinder is located on the right side of the second mold sleeve shaft; the extension rod of the second master cylinder points horizontally to the left, and the extension rod of the second master cylinder is fixedly connected to the second mold sleeve shaft.

5. A double-headed shrinking and tamping machine according to claim 1, 2 or 3, characterized in that: An upper pull rod and a lower pull rod are arranged between the first fixed seat and the second fixed seat, the left end of the upper pull rod is fixedly connected to the first fixed seat above the first mold sleeve shaft, the right end of the upper pull rod is fixedly connected to the second fixed seat above the second mold sleeve shaft, the left end of the lower pull rod is fixedly connected to the first fixed seat below the first mold sleeve shaft, the right end of the lower pull rod is fixedly connected to the second fixed seat below the second mold sleeve shaft, and the upper pull rod and the lower pull rod are parallel to the axis of the first mold sleeve shaft and the axis of the second mold sleeve shaft.

6. A double-head shrinking and piercing machine according to claim 1, characterized in that: The structure of the clamping device includes: a supporting cylinder and a clamping cylinder; the cylinder body of the supporting cylinder is fixedly installed below the first mold sleeve shaft and the second mold sleeve shaft, the extending rod of the supporting cylinder points upward, a supporting block is fixedly installed at the top end of the extending rod of the supporting cylinder, and a first clamping port is arranged on the top surface of the supporting block; the cylinder body of the clamping cylinder is fixedly installed above the first mold sleeve shaft and the second mold sleeve shaft, the extending rod of the clamping cylinder points downward, a clamping block is fixedly installed at the bottom end of the extending rod of the clamping cylinder, and a second clamping port is arranged on the bottom surface of the clamping block.

7. Double-station double-head shrinking drum machine, characterized by: The invention comprises two double-headed tube shrinking drum machines which are installed on a frame from front to back at intervals. The double-headed tube shrinking drum machine has any one of the structures in claims 1 to 6.

8. The double-station double-head shrinking drum machine according to claim 7, characterized in that: A loading rack is installed on the frame in front of the double-headed shrinking and drumming machine located in the front, and the loading rack is gradually tilted downward from front to back; a unloading rack is installed on the frame behind the double-headed shrinking and drumming machine located in the rear, and the unloading rack is gradually tilted downward from front to back; a pipe transfer assembly is arranged on the frame between the loading rack and the unloading rack for conveying the metal pipes to be processed output from the loading rack to at least one double-headed shrinking and drumming machine, and for conveying the finished metal pipes after the shrinking and drumming process to the unloading rack.

9. The double-station double-head shrinking and piercing machine according to claim 8, characterized in that: A pipe transfer assembly is respectively arranged on the left and right sides of the two double-headed pipe shrinking and piercing machines, and the structure of the pipe transfer assembly is as follows: the cylinder body of the vertical oil cylinder is fixedly installed on the frame, the extending rod of the vertical oil cylinder points upward, and the mold changing seat is fixedly installed on the top of the extending rod of the vertical oil cylinder; the cylinder body of the mold changing oil cylinder is fixedly installed on the mold changing seat, the extending rod of the mold changing oil cylinder points backward, and the pipe transfer seat is fixedly installed on the rear end of the extending rod of the mold changing oil cylinder, and three shelf grooves are spaced from front to back on the top surface of the pipe transfer seat.

10. The double-station double-head shrinking and piercing machine according to claim 9, characterized in that: A guide column structure is provided between the mold changing seat and the frame of each pipe transfer assembly, and the guide column structure includes at least two guide columns, each of which is vertically movable and inserted into a corresponding guide hole with a guide sleeve on the frame, the top of each guide column extending from above the corresponding guide sleeve is fixedly connected to the mold changing seat, and the bottom of each guide column extending from below the corresponding guide sleeve is fixedly connected to the bottom plate.

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