A pipe threading device

Abstract

A pipe threading device, which comprises a pipe threading mechanism, a clamping mechanism and a frame; the pipe threading mechanism includes a moving seat, a clamping component, a driving mechanism, a clamp mounting seat, and the clamping component is mounted on the moving seat, and the driving mechanism is connected to and drives the clamp mounting seat to reciprocate; the clamping mechanism includes a base, a clamping die component and a connecting rod driving component, the clamping die component includes left and right clamping die components, opposite left and right semi-circular grooves are respectively provided on the left and right clamping die components, when the left and right semi-circular grooves are combined together, they are in conformity with the outer circumference of the U-shaped pipe; the connecting rod driving components are respectively disposed between the base and the left clamping die component and between the base and the right clamping die component; the connecting rod driving component includes a connecting rod frame and a connecting rod driver, both sides of the connecting rod frame are respectively hinged to one ends of several spaced connecting rods, one end of the connecting rod on one side of the connecting rod frame is hinged to the base, and the other end of the connecting rod on the other side of the connecting rod frame is hinged to the left clamping die or the right clamping die mounting seat, and the connecting rod driver is hinged to the connecting rod frame and drives the connecting rod frame to reciprocate.

Description

Technical Field

[0001] The invention relates to a pipe threading device. Background Art

[0002] A critical step in the production of air conditioning heat exchangers is inserting the U-tube into the fin stack, followed by the tube expansion process. Currently, this process is largely manual, which is extremely inefficient and labor-intensive, resulting in high staff turnover and increased production costs. Furthermore, since the straight ends of the U-tubes tend to open due to rebound after being bent, manual insertion can be achieved by pinching the straight ends to close them before inserting them into the fin holes. However, automated tube insertion requires a straightening mechanism to close the straight ends, otherwise automated tube insertion is impossible. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a pipe threading device so that the pipe threading device can be automatically performed.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A pipe threading device, which includes a pipe threading mechanism, a clamping mechanism and a frame; the pipe threading mechanism includes a movable seat, a clamping assembly, and a driving mechanism, the clamping device mounting seat and the clamping assembly are installed on the movable seat, and the driving mechanism is connected and drives the clamping device mounting seat to reciprocate; the clamping mechanism includes a base, a clamping die assembly and a connecting rod driving assembly, the clamping die assembly includes a left clamping die assembly, a right clamping die assembly arranged opposite to the left clamping die assembly, the left clamping die assembly includes a left clamping die mounting seat and a left clamping die, the right clamping die assembly includes a right clamping die mounting seat and a right clamping die, the left clamping die is movably mounted on the left clamping die mounting seat, the right clamping die is movably mounted on the right clamping die mounting seat, the left clamping die and the right clamping die are The mold is provided with a left semicircular groove and a right semicircular groove respectively. When the left semicircular groove and the right semicircular groove are combined together, they can just fit with the outer circle of the U tube; the connecting rod drive assembly has two identical groups, which are respectively placed between the base and the left clamping mold assembly and between the base and the right clamping mold assembly; the connecting rod drive assembly includes a connecting rod frame and a connecting rod driver. The two sides of the connecting rod frame are respectively hinged to one end of several spaced connecting rods, the other end of the connecting rod on one side of the connecting rod frame is hinged to the base, and the other end of the connecting rod on the other side of the connecting rod frame is hinged to the left clamping mold mounting seat or the right clamping mold mounting seat. The connecting rod driver is hinged to the connecting rod frame and drives the connecting rod frame to move back and forth; the base and the movable seat are movably connected to the frame.

[0006] Preferably, the driving mechanism includes a motor, a transmission mechanism, a screw rod, and a screw nut. The motor is installed on the machine frame, the screw nut is installed on the moving seat, the screw rod is sleeved in the screw nut, and its upper and lower ends are respectively supported by rolling on the machine frame. The motor is connected to the screw rod through the transmission mechanism, and the motor drives the screw rod to rotate, so that the screw nut drives the moving seat to move up and down, and then the clamp can drive the long U-shaped tube to move up and down.

[0007] Preferably, in order to make the moving seat move up and down smoothly, a guiding mechanism is provided between the moving seat and the machine frame, and the moving seat can move smoothly along the slide rail.

[0008] Preferably, the link driver is a cylinder, which has a simple structure and is convenient to connect.

[0009] Preferably, the link frame includes an upper rod, a lower rod, and a plurality of connecting columns connecting the upper rod and the lower rod. One ends of several links are respectively hinged to both sides of the upper rod and the lower rod. The other ends of the links on one side of the upper rod and the lower rod are hinged to the base. The other ends of the links on the other side of the upper rod and the lower rod are respectively connected to the left clamp mounting seat and the right clamp mounting seat. The piston rod of the cylinder is hinged to the link frame, and the cylinder block of the cylinder is hinged to the base. In this way, by the telescopic movement of the piston rods of the two cylinders at the same time, the two links respectively drive the left clamp mounting seat and the right clamp mounting seat to approach or move away from each other, so as to control the closing and opening of the left clamp and the right clamp. When the left clamp and the right clamp are closed, there is still a certain gap between them and they are not completely fitted.

[0010] Preferably, in order to make the left clamp mounting seat and the right clamp mounting seat move more smoothly and accurately in the base, a clamp mounting seat guiding mechanism is also provided, which includes a guiding plate and guiding wheels. The guiding plate is installed on the inner sides of the two sides of the base, and the guiding plate has a guiding surface. The guiding wheels are respectively installed on both sides of the left clamp mounting seat and the right clamp mounting seat, and the guiding wheels can roll on the guiding surface of the guiding plate.

[0011] Preferably, a limiting boss is also provided on the stroke of the guiding wheels to prevent the left clamp mounting seat or the right clamp mounting seat from moving excessively.

[0012] Preferably, the clamping mechanism further includes a secondary clamping mechanism, which includes an airbag and an air source. An air inlet pipe is provided on the airbag. The airbag is arranged between the left clamp mounting seat and the left clamp, and between the right clamp mounting seat and the right clamp. In this way, the air source enters the airbag through the air inlet pipe, making the airbag expand and pushing the left clamp and the right clamp to move, so as to force the left clamp and the right clamp to completely fit and fully clamp the U-shaped tube.

[0013] Preferably, a clamping die reset mechanism is further provided and is respectively arranged on the left clamping die assembly and the right clamping die assembly. The clamping die reset mechanism includes a screw, a nut and a reset spring. One end of the screw passes through the left clamping die mounting seat or the right clamping die mounting seat and is fixed on the left clamping die and the right clamping die, and the reset spring is sleeved thereon. The other end of the screw is connected with the nut and limits the reset spring. When the airbag 210 is not inflated, the left clamping die and the right clamping die are automatically reset by the spring restoring force of the reset spring, so as to facilitate the normal insertion of the U-shaped tube for the next time.

[0014] Preferably, a clamping mechanism driving mechanism is further provided. The clamping mechanism driving mechanism is connected to and drives the clamping mechanism to reciprocate, so as to facilitate the adjustment of the position of the clamping mechanism.

[0015] More specifically, the clamping mechanism driving mechanism includes a clamping mechanism motor, a clamping mechanism transmission mechanism, a clamping mechanism screw rod and a clamping mechanism screw rod nut. The clamping mechanism motor is installed on the machine frame. The screw rod nut is installed on the moving seat. The screw rod is sleeved in the screw rod nut and is respectively supported by rolling at its upper and lower ends through the machine frame. The clamping mechanism motor is connected to the clamping mechanism screw rod through the clamping mechanism transmission mechanism, and the clamping mechanism motor drives the screw rod to rotate, so that the clamping mechanism screw rod nut drives the base to move up and down.

[0016] More specifically, the clamping assembly includes a clamp, a clamp mounting seat, a push plate and a clamping driver; the clamp mounting seat and the clamping driver are installed on the moving seat. The clamp is installed on the clamp mounting seat, and its push rod is connected to the push plate. The clamping driver is connected to the push plate. The clamping driver drives the push plate to move, thereby driving the push rod to move, and further controlling the opening and closing of the clamp to clamp or loosen the U-shaped end of the U-shaped tube.

[0017] Compared with the prior art, the advantages of the present invention are as follows: the U-shaped tube can be automatically grabbed by the tube inserting mechanism and inserted into the fin stack, realizing automatic tube insertion; the U-shaped tube grabbed by the tube inserting mechanism can be straightened by the clamping mechanism, making the insertion of the U-shaped tube into the fin stack smooth; the link driving assembly is adopted, and the clamping force is large and stable. Brief Description of the Drawings

[0018] Figure 1 It is a three-dimensional schematic diagram of a tube inserting device according to an embodiment of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a tube inserting mechanism of a tube inserting device according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of a clamping mechanism of a tube inserting device according to an embodiment of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a clamping mechanism of a tube inserting device according to an embodiment of the present invention after removing the cover plate and performing partial sectioning.

[0022] Figure 5 This is a side view of the clamping die assembly of a pipe threading device according to an embodiment of the present invention.

[0023] Figure 6 It is Figure 5 the A-A sectional view of

[0024] Figure 7 It is Figure 4 the enlarged view of part B in Specific embodiments

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] As Figure 1 and 2 shown, a pipe threading device includes: a pipe threading mechanism 1, a clamping mechanism 2, and a frame 10.

[0027] The pipe threading mechanism 1 includes a moving seat 101, a clamping assembly, and a lifting drive mechanism.

[0028] The clamping assembly includes a clamp 102, a clamp mounting seat 103, a push plate 104, and a clamp driver 105.

[0029] The clamp mounting seat 103 and the clamp driver 105 are mounted on the moving seat 101, the clamp 102 is mounted on the clamp mounting seat 103, its push rod (not shown in the figure) is connected to the push plate 104, and the clamp driver 105 is connected to the push plate 104. The clamp driver 105 drives the push plate 104 to move, thereby driving the push rod to move, and further controlling the opening and closing of the clamp 103 to clamp or release the U-shaped end of the U-shaped pipe.

[0030] The clamp 102 is an existing technology, and it has the same or similar structure as a U-shaped end clamping device described in the invention patent 201310657261.6. By the reciprocating movement of the clamp push rod, the jaws at its head open or close, thereby opening or clamping the U end of the U-shaped pipe.

[0031] In this embodiment, the clamp driver 105 is a cylinder, the piston rod of the cylinder is connected to the push plate 104, and the push plate 104 is connected to the push rod of the clamp 102. Thus, through the reciprocating movement of the cylinder, the push plate 104 can be driven to reciprocate, so that the clamp 102 opens and closes under the action of its push rod, realizing the automatic opening and closing of the clamp 102.

[0032] The lifting drive mechanism includes a motor 106, a driving pulley, a driven pulley 107, a screw rod 108, and a screw nut 109.

[0033] The motor 106 is installed on the frame 10, and a driving pulley (not shown in the figure) is installed on its output shaft. The screw nut 109 is installed on the moving seat 101. The screw rod 108 is sleeved in the screw nut 109, and its upper and lower ends are respectively supported by rolling on the frame 10. The driven pulley 107 is installed at the upper end of the screw rod 108, and it is connected to the driving pulley by a belt. The motor 106 drives the driving pulley on its output shaft to rotate, and through belt transmission, drives the driven pulley 107 to rotate, thereby driving the screw rod 108 to rotate, causing the screw nut 109 to drive the moving seat 101 to move up and down, so that the clamp 102 can drive the long U-shaped tube 11 to move up and down.

[0034] In order to make the moving seat 101 move up and down smoothly, a guiding mechanism is provided between the moving seat 101 and the frame 10. In this embodiment, the guiding mechanism includes a slider 111 and a slide rail 110. The slider 111 is installed on the moving seat 101, and the slide rail 110 is installed on the frame 10, so that the moving seat 101 can move smoothly along the slide rail 110.

[0035] The clamping mechanism 2 includes a base 201, a clamping die assembly and a connecting rod driving assembly.

[0036] The clamping die assembly includes a left clamping die assembly and a right clamping die assembly arranged opposite to the left clamping die assembly. The left clamping die assembly includes a left clamping die mounting seat 206 and a left clamping die 208. The right clamping die assembly includes a right clamping die mounting seat 207 and a right clamping die 209. The left clamping die 208 is installed on the left clamping die mounting seat 206, and the right clamping die is installed on the right clamping die mounting seat 207. Left semi-circular grooves 2081 (not shown in the figure) and right semi-circular grooves 2091 are respectively provided on the left clamping die 208 and the right clamping die 209. When the left semi-circular groove 2081 and the right semi-circular groove 2091 are combined together, they can just fit with the outer circle of the U-shaped tube.

[0037] There are two identical groups of the connecting rod driving assemblies, which are respectively arranged between the base 201 and the left clamping die assembly and between the base 201 and the right clamping die assembly.

[0038] The connecting rod drive assembly includes a connecting rod frame 202 and a cylinder 204. In this embodiment, the connecting rod frame 202 includes an upper rod 2021, a lower rod 2022, and a plurality of connecting columns 2023 connecting the upper rod and the lower rod. One end of each of several connecting rods 203 is hinged to both sides of the upper rod 2021 and the lower rod 2022. The other end of the connecting rods on one side of the upper rod 2021 and the lower rod 2022 is hinged to the base 201. The other end of the connecting rods on the other side of the upper rod 2021 and the lower rod 2022 is hinged to the left clamping die assembly or the right clamping die assembly. In this embodiment, they are respectively connected to the left clamping die mounting seat 206 and the right clamping die mounting seat 207. The piston rod of the cylinder 204 is hinged to the connecting rod frame 202, and the cylinder block of the cylinder 204 is hinged to the base 201. Thus, by the telescoping of the piston rods of the two cylinders 204 simultaneously, the two connecting rods 203 drive the left clamping die mounting seat 206 and the right clamping die mounting seat 207 to approach or move away from each other, thereby controlling the closing and opening of the left clamping die 208 and the right clamping die 209. When the left clamping die 208 and the right clamping die 209 are closed, there is still a certain gap between them and they are not completely in contact.

[0039] Preferably, in order to make the left clamping die mounting seat 206 and the right clamping die mounting seat 207 move more smoothly and accurately within the base 201, a guiding mechanism is further provided, which includes a guiding plate 205 and guiding wheels 2051. The guiding plate 205 is installed on the two inner sides of the base 201 and has a guiding surface. The guiding wheels 2051 are respectively installed on the two sides of the left clamping die mounting seat 206 and the right clamping die mounting seat 207. As Figure 7 shown, the guiding wheels 2051 can roll on the guiding surface of the guiding plate 205.

[0040] Limit convex platforms are also provided on the travel of the guiding wheels 205 to prevent the left clamping die mounting seat 206 or the right clamping die mounting seat 207 from moving excessively.

[0041] The clamping mechanism 2 further includes a secondary clamping mechanism, which includes an airbag 210 and a gas source (not shown in the figure). An air inlet pipe 2101 is provided on the airbag 210. The airbag 210 is arranged between the left clamping die mounting seat 206 and the left clamping die 208, and between the right clamping die mounting seat 207 and the right clamping die 209. The gas source enters the airbag 210 through the air inlet pipe 2101, causing the airbag 210 to expand and push the left clamping die 208 and the right clamping die 209 to move, thereby forcing the left clamping die 208 and the right clamping die 209 to completely contact and fully clamp the U-shaped pipe.

[0042] A die clamping reset mechanism is also provided, which is respectively arranged on the left die clamping component and the right die clamping component. It includes a screw 3, a nut 4 and a reset spring 5. One end of the screw 3 passes through the left die clamping mounting seat 206 or the right die clamping mounting seat 207 and is fixed on the left die clamping 208 and the right die clamping 209, and the reset spring 5 is sleeved on it. The other end of the screw 3 is connected with the nut 4 to limit the reset spring 5. When the airbag 210 is not inflated, the left die clamping 208 and the right die clamping 209 are automatically reset by the spring restoring force of the reset spring 5 to facilitate the normal insertion of the U-shaped tube for the next time, as Figure 6 shown.

[0043] The clamping mechanism 2 further includes a support column 216 and a cover plate 217. The lower end of the support column is installed on the base 201, and the cover plate 217 is installed on the base 201 and connected to the upper end of the support column 216, so that the force bearing of the entire clamping mechanism 2 is better and a strengthening effect is achieved.

[0044] The clamping mechanism 2 further includes a clamping mechanism lifting drive mechanism. The clamping mechanism lifting drive mechanism includes a motor 211, a driven pulley 212, a screw rod 213 and a screw nut 214 (not shown in the figure). The motor 211 is installed on the frame 10, and a driving pulley (not shown in the figure) is installed on its output shaft. The screw nut 214 is installed on the base 201. The screw rod 213 is sleeved in the screw nut 214, and its upper and lower ends are respectively supported by rolling on the frame 10. The driven pulley 212 is installed at the upper end of the screw rod 213 and is connected to the driving pulley by a belt. The motor 211 drives the driving pulley on its output shaft to rotate, drives the driven pulley 212 to rotate through belt transmission, and then drives the two screw rods 213 to rotate, so that the screw nut 214 drives the base 201 to move up and down, and the clamping mechanism can be moved up and down.

[0045] In order to make the base 201 move up and down smoothly, a guiding mechanism is provided between the base 201 and the frame 10. In this embodiment, the guiding mechanism includes a slider 215, and the slide rail is still the above-mentioned slide rail 110. The slider 215 is installed on the base 01, and the slide rail 110 is installed on the frame 10, so that the base 201 can move smoothly along the slide rail 110.

[0046] This pipe threading device can be moved as a whole and can perform the following actions.

[0047] (1) When the left clamp 208 and the right clamp 209 of the clamping mechanism 2 are opened, the tube threading mechanism 1 drives the clamp 102 and the clamp mounting seat 103 to move freely up and down within a certain range between the left clamp 208 and the right clamp 209 through the lifting drive mechanism. When the clamp mounting seat 103 moves downward, the clamping driver 105 can make the clamp 102 clamp the U-tube 11. After clamping the U-tube, the clamp 102 moves upward. After the clamp 102 is completely separated from the left clamp 208 and the right clamp 209, the connecting rod drive mechanism closes the left clamp 208 and the right clamp 209, but does not actually clamp the U-tube. The U-tube can continue to move upward under the drive of the clamp 102. During the rising process, the U-tube is restricted by the left semicircular groove 2081 and the right semicircular groove 2091. The U-tube is straightened gradually from top to bottom, the straight tube end is gathered, the clamp 102 rises to a specific position and stops, and then the entire tube threading device is moved to the top of the fin stack so that the U-tube is just aligned with the fin hole of the fin stack. The clamp 102 clamps the U-tube and moves downward, and gradually inserts the U-tube into the fin stack. When the clamp 102 moves downward and is close to the clamping mechanism 2, the left clamp 208 and the right clamp 209 are opened to let the clamp 102 pass, so that the last section of the U-tube is completely inserted into the fin stack, and the tube threading is completed.

[0048] (2) The function of the secondary clamping mechanism is that after the U-tube is straightened, the airbag 210 is expanded by air intake, forcing the left clamping die 208 and the right clamping die 209 to completely clamp the lower part of the U-tube, so that the tube mouth at the lower end of the U-tube can be shaped, and other operations that require clamping the U-tube can also be performed.

Claims

1. A pipe threading device, characterized in that: It includes a pipe threading mechanism, a clamping mechanism and a frame; the pipe threading mechanism includes a movable seat, a clamping assembly, and a driving mechanism, the clamping assembly is installed on the movable seat, and the driving mechanism is connected and drives the clamp mounting seat to reciprocate; the clamping mechanism includes a base, a clamping die assembly and a connecting rod driving assembly, the clamping die assembly includes a left clamping die assembly, a right clamping die assembly arranged opposite to the left clamping die assembly, the left clamping die assembly includes a left clamping die mounting seat and a left clamping die, the right clamping die assembly includes a right clamping die mounting seat and a right clamping die, the left clamping die is movably mounted on the left clamping die mounting seat, the right clamping die is movably mounted on the right clamping die mounting seat, and the left clamping die and the right clamping die are respectively provided with corresponding The left semicircular groove and the right semicircular groove are connected, and when the left semicircular groove and the right semicircular groove are combined together, they can just fit with the outer circle of the U tube; the connecting rod drive assembly has two identical groups, which are respectively placed between the base and the left clamping mold assembly and between the base and the right clamping mold assembly; the connecting rod drive assembly includes a connecting rod frame and a connecting rod driver, and the two sides of the connecting rod frame are respectively hinged to one end of several spaced connecting rods, the other end of the connecting rod on one side of the connecting rod frame is hinged to the base, and the other end of the connecting rod on the other side of the connecting rod frame is hinged to the left clamping mold mounting seat or the right clamping mold mounting seat, the connecting rod driver is hinged to the connecting rod frame and drives the connecting rod frame to move back and forth; the base and the movable seat are movably connected to the frame.

2. The pipe threading device according to claim 1, characterized in that: The driving mechanism includes a motor, a transmission mechanism, a screw and a screw nut. The motor is installed on the frame, the screw nut is installed on the movable seat, the screw is inserted into the screw nut, and the upper and lower ends of the screw are respectively supported by the frame for rolling. The motor and the screw are connected through the transmission mechanism, and the motor drives the screw to rotate, so that the screw nut drives the movable seat to move up and down.

3. The pipe threading device according to claim 2, characterized in that: A guide mechanism is provided between the movable seat and the frame.

4. The pipe threading device according to claim 1, wherein: The connecting rod frame includes an upper rod, a lower rod and multiple connecting columns connecting the upper rod and the lower rod. The two sides of the upper rod and the lower rod are respectively hinged to one end of several connecting rods, the other end of the connecting rod on one side of the upper rod and the lower rod is hinged to the base, and the other end of the connecting rod on the other side of the upper rod and the lower rod is respectively connected to the left clamping mold mounting seat and the right clamping mold mounting seat, the piston rod of the cylinder is hinged to the connecting rod frame, and the cylinder body of the cylinder is hinged to the base.

5. The pipe threading device according to claim 1, characterized in that: A clamping die mounting seat guide mechanism is provided, which includes a guide plate and a guide wheel. The guide plate is installed on the second inner side of the base, and the guide plate is provided with a guide surface. The guide wheels are respectively installed on the two sides of the left clamping die mounting seat and the right clamping die mounting seat, and the guide wheels can roll on the guide surface of the guide plate.

6. The pipe threading device according to claim 1, characterized in that: The clamping mechanism includes a secondary clamping mechanism, which includes an airbag and an air source. An air inlet pipe is provided on the airbag. The airbag is provided between the left clamping mold mounting seat and the left clamping mold, and between the right clamping mold mounting seat and the right clamping mold.

7. The pipe threading device according to claim 1, characterized in that: A clamping die reset mechanism is also provided, which is respectively provided on the left clamping die assembly and the right clamping die assembly, and includes a screw, a nut and a reset spring. One end of the screw passes through the left clamping die mounting seat or the right clamping die mounting seat and is fixed to the left clamping die and the right clamping die, and is covered with a reset spring. The other end of the screw is connected to the nut and limits the reset spring. When the airbag is not ventilated, the left clamping die and the right clamping die are automatically reset by the spring restoring force of the reset spring, so as to facilitate the normal insertion of the U-tube next time.

8. The pipe threading device according to claim 1, characterized in that: A clamping mechanism driving mechanism is also provided, which is connected to and drives the clamping mechanism to reciprocate.

9. The pipe threading device according to claim 8, characterized in that: The clamping mechanism driving mechanism includes a clamping mechanism motor, a clamping mechanism transmission mechanism, a clamping mechanism screw and a clamping mechanism screw nut. The clamping mechanism motor is installed on the frame, and the screw nut is installed on the movable seat. The screw is inserted into the screw nut, and its upper and lower ends are respectively supported by the frame for rolling. The clamping mechanism motor and the clamping mechanism screw are connected through the clamping mechanism transmission mechanism, and the clamping mechanism motor drives the screw to rotate, so that the clamping mechanism screw nut drives the base to move up and down.

10. The pipe threading device according to claim 1, characterized in that: The clamping assembly includes a clamp, a clamp mounting seat, a push plate and a clamping driver; the clamp mounting seat and the clamping driver are installed on a movable seat, the clamp is installed on the clamp mounting seat, its push rod is connected to the push plate, and the clamping driver is connected to the push plate. The clamping driver drives the push plate to move, thereby driving the push rod to move, and then controlling the opening and closing of the clamp to clamp or loosen the U-shaped end of the U-tube.

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