Automatic assembling machine for seat framework pipe

Abstract

The invention provides an automatic assembling machine for seat framework pipes. The automatic assembling machine comprises a workbench, an inner pipe output mechanism, an inner pipe conveying mechanism, a fixing mechanism and an inner pipe pushing and assembling mechanism. A discharging station and an assembling station are arranged on the workbench; the inner pipe output mechanism is arranged at the discharging station and used for outputting inner pipes. The inner pipe conveying mechanism is used for conveying the inner pipes output by the discharging station to the assembling station. The fixing mechanism is arranged at the assembling station and comprises an inner pipe pressing mechanism and an outer pipe pressing mechanism, the inner pipe pressing mechanism is used for pressing and fixing the inner pipe conveyed to the assembling station, and the outer pipe pressing mechanism is used for pressing and fixing the outer pipe located at the assembling station; the inner pipe pushing and assembling mechanism is arranged on one side of the assembling station and used for pushing the inner pipe into the outer pipe. According to the automatic assembling machine, the inner pipes can be automatically output and conveyed to the assembling station to be fixed, then the inner pipes are automatically pushed into the outer pipes through the inner pipe pushing and assembling mechanism, automatic assembling of the seat framework pipes is achieved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to an automatic assembly machine for seat frame tubes. Background Art

[0002] The frame (skeleton) of some seat backs is made of bent long steel pipes. In order to strengthen the local strength of the backrest frame, it is usually necessary to insert an inner pipe of appropriate length into the outer pipe, that is, a double-layer pipe body assembly is adopted.

[0003] However, the outer tube and the inner tube are usually manually fed and positioned, and then the pushing mechanism is activated to apply pressure for assembly, which is cumbersome and affects production efficiency. Summary of the Invention

[0004] The object of the present invention is to propose an automatic assembly machine for seat frame tubes, comprising a workbench, an inner tube output mechanism, an inner tube conveying mechanism, a fixing mechanism and an inner tube pushing mechanism; the workbench is provided with a discharge station and an assembly station; the inner tube output mechanism is arranged at the discharge station for outputting the inner tube; the inner tube conveying mechanism is used to convey the inner tube outputted from the discharge station to the assembly station; the fixing mechanism is arranged at the assembly station, and the fixing mechanism comprises an inner tube clamping mechanism and an outer tube clamping mechanism arranged in parallel, the inner tube clamping mechanism is used to clamp and fix the inner tube conveyed to the assembly station, and the outer tube clamping mechanism is used to clamp and fix the outer tube located at the assembly station; the inner tube pushing mechanism is arranged on one side of the assembly station and opposite to the inner tube clamping mechanism, so as to push the inner tube into the outer tube.

[0005] This technical solution automatically outputs the inner tube and transports it to the assembly station for fixation through the cooperation of the inner tube output mechanism, the inner tube conveying mechanism, the fixing mechanism and the inner tube pushing mechanism. The inner tube is then automatically pushed into the outer tube by the inner tube pushing mechanism, thereby realizing the automatic assembly of the seat frame tube and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the seat frame tube automatic assembly machine of the present invention.

[0007] Figure 2 It is a top view of the automatic assembly machine for seat frame tubes of the present invention.

[0008] Figure 3-8 This is a working principle diagram of the present invention.

[0009] Figure 9 and Figure 10 Schematic diagrams of the structure of the inner tube output mechanism of the present invention at different angles.

[0010] Figure 11 for Figure 10 Enlarged view of part A in the middle.

[0011] Figure 12 It is a structural schematic diagram of the inner tube output mechanism of the present invention when the push rod moves to the discharge position.

[0012] Figure 13 It is a cross-sectional view of the inner tube output mechanism of the present invention.

[0013] Figure 14 This is a cross-sectional view of the inner tube output mechanism of the present invention when the ejector rod moves to the discharge position.

[0014] Figure 15 It is a structural schematic diagram of the inner tube conveying mechanism of the present invention.

[0015] Figure 16 This is a structural schematic diagram of the inner tube conveying mechanism of the present invention, in which the conveying clamp is in a clamped state and located in a lowered position.

[0016] Figure 17 This is a structural schematic diagram of the inner tube conveying mechanism of the present invention, in which the conveying clamp is in a separated state and located in an ascending position.

[0017] Figure 18 and Figure 19 Schematic diagrams of the structure of the fixing mechanism of the present invention at different angles.

[0018] Figure 20 This is a structural schematic diagram of the fixing mechanism of the present invention with the side portion of the fixing frame hidden.

[0019] Figure 21 It is a partial structural diagram of the fixing mechanism of the present invention.

[0020] Figure 22 It is a schematic diagram of the matching structure of the upper inner tube pressing block and the upper outer tube pressing block of the present invention.

[0021] Figure 23 It is a structural schematic diagram of the inner tube pushing and installing mechanism of the present invention.

[0022] Figure 24 It is a structural schematic diagram of the outer tube positioning mechanism of the present invention. DETAILED DESCRIPTION

[0023] The present application is further described below with reference to the accompanying drawings:

[0024] See attached Figure 1-24 , a seat frame tube automatic assembly machine is used to assemble an inner tube 91 into an outer tube 92, wherein the length of the outer tube 92 is greater than the inner tube 91, and the inner diameter of the outer tube 92 matches the outer diameter of the inner tube.

[0025] The seat frame tube automatic assembly machine includes a workbench 1, an inner tube output mechanism 2, an inner tube conveying mechanism 3, a fixing mechanism 4, an inner tube pushing mechanism 7 and an outer tube positioning mechanism 8.

[0026] The workbench 1 is provided with a discharge station 11 and an assembly station 12. The inner tube output mechanism 2 is provided at the discharge station 11 for outputting the inner tube 91. The inner tube conveying mechanism 3 is used to convey the inner tube 91 outputted from the discharge station 11 to the assembly station 12. The fixing mechanism 4 is provided at the assembly station 12, and the fixing mechanism 4 includes an inner tube clamping mechanism 5 and an outer tube clamping mechanism 6 arranged in parallel. The inner tube clamping mechanism 5 is used to clamp and fix the inner tube 91 conveyed to the assembly station 12, and the outer tube clamping mechanism 6 is used to clamp and fix the outer tube 92 located at the assembly station 12. The inner tube pushing mechanism 7 is provided at one side of the assembly station 12 and opposite to the inner tube clamping mechanism 5, so as to push the inner tube 91 into the outer tube 92 for assembly. The outer tube positioning mechanism 8 is provided at the other side of the assembly station 12 and opposite to the outer tube clamping mechanism 6.

[0027] like Figure 2 As shown, the inner tube pushing mechanism 7, the inner tube pressing mechanism 5, the outer tube pressing mechanism 6 and the outer tube positioning mechanism 8 are arranged in sequence along a straight line, and the inner tube conveying mechanism 3 is located between the inner tube pushing mechanism 7 and the inner tube pressing mechanism 5.

[0028] This technical solution automatically outputs the inner tube and transports it to the assembly station 12 for fixation through the cooperation of the inner tube output mechanism 2, the inner tube conveying mechanism 3, the fixing mechanism 4 and the inner tube pushing mechanism 7, and then the inner tube pushing mechanism 7 automatically pushes the inner tube into the outer tube, thereby realizing the automatic assembly of the seat frame tube and improving production efficiency.

[0029] The inner tube output mechanism 2 includes a silo 21 and a discharge mechanism; the silo 21 has a receiving cavity 211 for receiving the inner tube 91 and a discharge port 20 connected to the receiving cavity 211 for outputting the inner tube 91; the discharge port 20 is located at the top of the front end of the receiving cavity 211; the discharge mechanism includes a push rod 22; the receiving cavity 211 includes a bottom wall 212, and the push rod 22 can be movably arranged up and down at the front end of the bottom wall 212 of the receiving cavity 211 to approach or move away from the discharge port 20.

[0030] This technical solution adopts a push-type discharging method to output the inner tube 91, which is easy to control the output rhythm and convenient to cooperate with the inner tube conveying mechanism 3.

[0031] The bottom wall 212 of the receiving chamber 211 includes an inclined section 2121 inclined from its rear end to the front end and a horizontal section 2122 connected to the front of the inclined section 2121. The inclined section 2121 makes the inner tube in the receiving chamber 211 have a tendency to roll toward the front end of the receiving chamber 211. The horizontal section 2122 is provided with a through hole 2123 for the ejector rod 22 to pass through. The ejector rod 22 moves up and down in the through hole 2123 to rotate in a certain direction. Switching between a discharging position and a receiving position; the accommodating cavity 211 includes a vertical front end wall 213; the top surface 221 of the push rod is an inclined surface inclined downward from back to front; when the push rod 22 is in the discharging position, the top surface 221 of the push rod reaches the discharge port 20 to push the inner tube in the horizontal section 2122 out of the discharge port 20; when the push rod 22 is in the receiving position, the top surface 221 of the push rod falls into the through hole 2123, without affecting the inner tube rolling to the horizontal section 2122.

[0032] The bottom wall 212 of the silo 21 of the present technical solution can make the inner tube 91 automatically roll to the front end by setting the inclined section 2121 and stop at the horizontal section 2122. The top rod 22 is set at the horizontal section 2122 to output the inner tubes 91 one by one in an orderly manner.

[0033] The top surface of the push rod 22 is an inclined surface inclined from back to front, forming an angle with the front end wall 213 of the receiving cavity 211, which can prevent the inner tube 91 from rolling down and ensure the stability of the output.

[0034] The front side of the discharge port 20 is provided with a discharge guide plate 214 extending downwardly and obliquely; when the push rod 22 is in the discharge position, the top surface of the push rod 22 is connected with the discharge guide plate 214; the discharge port 20 extends along the left and right sides of the silo 21 for the horizontal output of the inner tube; the left and right sides of the silo 21 are provided with supporting parts 215 for supporting the two ends of the inner tube below the discharge guide plate 214.

[0035] In this technical solution, a discharge guide plate 214 is provided at the discharge port 20 to guide the inner tube downward to the supporting portion 215 for buffering, so as to facilitate reception by the inner tube conveying mechanism 3 .

[0036] A limiting piece 216 is provided on one or both sides of the silo 21 above the discharge port 20 to prevent the inner tube 91 from flying upward due to inertia when being pushed out of the discharge port 20 by the ejector rod 22 .

[0037] The discharge mechanism also includes a lifting frame 23 and a discharge drive mechanism 24. The discharge drive mechanism 24 includes two, one on each side of the silo 21. The lifting frame 23 is concave in shape, with the middle portion of the lifting frame 23 located below the silo 21. The ends of the lifting frame 23 extend to either side of the silo 21 and are connected to the two discharge drive mechanisms 24, respectively. The ejector rods 22 include at least two, each of which has its bottom fixed to the lifting frame 23. The discharge drive mechanism 24 is used to drive the lifting frame 23 up and down, thereby driving the ejector rods 22 up and down. In this embodiment, two ejector rods 22 are provided.

[0038] In this technical solution, the discharge drive mechanism 24 is arranged on both sides of the silo 21 instead of on the bottom side of the silo 21. The discharge drive mechanism 24 is connected to the top rod 22 through the lifting frame 23, which can reduce the space between the silo 21 and the workbench and reduce the output height of the inner tube. It has a compact structure, a reasonable layout, and high space utilization.

[0039] The inner tube conveying mechanism 3 includes a conveying fixture 31, a slide rail 35, a slide table 34, and a sliding drive mechanism 36. The slide rail 35 is fixed to the workbench 1, and the slide table 34 is slidably mounted on the slide rail 35. The sliding drive mechanism 36 is connected to the slide table 34 to drive the slide table 34 to slide back and forth along the slide rail 35. The conveying fixture 31 is mounted on the slide table 34 and slides synchronously with the slide table 34 to move between the discharge station 11 and the assembly station 12.

[0040] The transport clamp 31 includes two clamping blocks 311 . The two clamping blocks 311 can move closer to or farther from each other so that the transport clamp 31 can be switched between a clamping state and a separation state.

[0041] When the conveying fixture 31 slides to the discharge station 11 , it is located below the discharge port 20 to clamp the inner tube 91 discharged from the discharge port 20 .

[0042] In this embodiment, the conveying fixture 31 is a pneumatic finger (pneumatic gripper).

[0043] The conveying clamps 31 are provided in two groups and are arranged in parallel, which can stably clamp the inner tube 91 and prevent deflection.

[0044] The side of the conveying clamp 31 close to the silo 21 is the rear side, and the two clamping blocks 311 are arranged front and back, and a limiting column 312 is erected on the front clamping block 311 to prevent the inner tube 91 from detaching when clamping the inner tube 91.

[0045] This technical solution receives and clamps the inner tube for transportation through the transportation clamp 31, which is stable, fast and easy to implement.

[0046] The inner tube conveying mechanism 3 also includes a lifting platform 32 and a lifting drive mechanism 33; the lifting drive mechanism 33 is installed on a slide 34, the lifting platform 32 is connected to the lifting drive mechanism 33 and is lifted up and down under the drive of the lifting drive mechanism 33; the conveying fixture 31 is installed on the lifting platform 32 and is lifted and lowered synchronously with the lifting platform 32 to switch between an ascending position and a descending position.

[0047] When the conveying fixture 31 is located below the discharge port 20 to receive the output inner tube 91 , the conveying fixture 31 may be easily ejected and fall onto the workbench 1 due to the large height difference.

[0048] The conveying fixture 31 of this technical solution can be raised and lowered. When the conveying fixture 31 slides to the discharge station 11, it can be switched to the raised position to clamp the inner tube 91 that has fallen on the support portion 215. The conveying fixture 31 rises closer to the discharge port 20 to reduce the height difference, and the inner tube 91 is cushioned on the support portion 215, thereby reducing the risk of falling.

[0049] When the conveying fixture 31 slides to the assembly station 12 , the conveying fixture 31 switches to the lowered position so that the inner tube 91 and the outer tube 92 are opposite to each other, so that the inner tube pressing mechanism 5 can be pressed and fixed.

[0050] The fixing mechanism 4 further includes a fixing frame 41 fixed on the workbench 1 .

[0051] The inner tube clamping mechanism 5 includes an upper inner tube pressing block 51, an inner tube upper driving mechanism 53, a lower inner tube pressing block 52 and an inner tube lower driving mechanism 54; the upper inner tube pressing block 51 is located above the lower inner tube pressing block 52, and the upper inner tube pressing block 51 and the lower inner tube pressing block 52 can approach each other or move away from each other to switch the inner tube clamping mechanism 5 between a clamping state and an open state; the inner tube upper driving mechanism 53 is installed on the fixing frame 41, and the upper inner tube pressing block 51 is connected to the inner tube upper driving mechanism 53; the inner tube lower driving mechanism 54 is installed on the workbench 1, and the lower inner tube pressing block 52 is connected to the inner tube lower driving mechanism 54; the upper inner tube pressing block 51 and the lower inner tube pressing block 52 are driven by the inner tube upper driving mechanism 53 and the inner tube lower driving mechanism 54 respectively to move up and down to approach or move away from each other.

[0052] The inner tube clamping mechanism 5 of the present technical solution adopts an upper inner tube pressing block 51 and a lower inner tube pressing block 52 that can approach or move away from each other. When the inner tube conveying mechanism 3 conveys the inner tube 91, the inner tube clamping mechanism 5 can be switched to an open state to provide space for the inner tube 91 to reach the assembly station 12; after the inner tube 91 reaches the assembly station 12, the inner tube clamping mechanism 5 switches to a clamping state, and the upper inner tube pressing block 51 and the lower inner tube pressing block 52 are brought close to each other to clamp and press the inner tube 91.

[0053] The outer tube pressing mechanism 6 includes an upper outer tube pressing block 61, an outer tube upper driving mechanism 63 and a lower outer tube pressing block 62; the lower outer tube pressing block 62 is fixed on the workbench 1 for supporting the outer tube; the upper outer tube pressing block 61 is located above the lower outer tube pressing block 62, and the upper outer tube pressing block 61 can be close to or away from the lower outer tube pressing block 62 to switch the outer tube pressing mechanism 6 between a pressing state and an open state; the outer tube upper driving mechanism 63 is installed on the fixing frame 41, and the outer tube upper driving mechanism 63 is connected to the upper outer tube pressing block 61 to drive the upper outer tube pressing block 61. The outer tube pressing block 61 moves up and down to approach or move away from the lower outer tube pressing block 62; the lower inner tube pressing block 52 is provided with a lower inner tube arc groove 521, and the upper inner tube pressing block 51 is provided with an upper inner tube arc groove 511; the lower outer tube pressing block 62 is provided with a lower outer tube arc groove 621, and the upper outer tube pressing block 61 is provided with an upper outer tube arc groove 611; when the upper inner tube pressing block 51 and the lower inner tube pressing block 52 are in a compressed state, the lower inner tube arc groove 521 and the lower outer tube arc groove 621 are at the same height and are coaxial, so that the inner tube 91 is aligned with the tube opening of the outer tube 92;

[0054] The upper inner tube pressing block 51 is provided with a guide protrusion 512, and the upper outer tube pressing block 61 is provided with a guide groove 612 corresponding in shape to the guide protrusion. The guide protrusion 512 is mounted within the guide groove 612 and moves up and down along the guide groove 612. The upper inner tube pressing block 51 and the upper outer tube pressing block 61 cooperate with each other through the guide protrusion 512 and the guide groove 612 to stabilize the relative positions of the upper inner tube pressing block 51 and the upper outer tube pressing block 61.

[0055] The lower outer tube pressing block 62 of the outer tube pressing mechanism 6 of the present technical solution is fixed on the workbench 1 for placing and positioning the outer tube 92 when loading the material; when the inner tube pushing mechanism 7 performs the pushing assembly operation, the outer tube pressing mechanism 6 switches to the clamping state, and the outer tube is pressed and fixed by the upper outer tube pressing block 61, so that the pushing assembly can be carried out stably.

[0056] The inner tube pushing mechanism 7 includes a push rod 71 and a horizontal pushing drive mechanism 72; the push rod 71 can move radially to switch between a pushing position close to the inner tube clamping mechanism 5 and a retracted position away from the inner tube clamping mechanism 5; the horizontal pushing drive mechanism 72 is installed on the workbench 1, specifically, the horizontal pushing drive mechanism 72 is installed on a support frame 73 on the workbench 1, so that the raised position facilitates the push rod 71 to be relative to the inner tube 91, and the push rod 71 is connected to the horizontal pushing drive mechanism 72 and is driven by the horizontal pushing drive mechanism 72 to move radially.

[0057] In this technical solution, the push rod 71 is used to push the inner tube to achieve the assembly operation of pushing the inner tube into the outer tube.

[0058] In this embodiment, the discharging drive mechanism 24, the sliding drive mechanism 36, the lifting drive mechanism 33, the inner tube upper drive mechanism 53, the inner tube lower drive mechanism 54, the outer tube upper drive mechanism 63, and the horizontal push drive mechanism 72 are all cylinders, and the movable rods of the cylinders drive the connected components to move.

[0059] The outer tube positioning mechanism 8 includes a positioning bracket 81 ; the positioning bracket 81 has a plurality of positioning recesses 82 ; the positioning recesses 82 are spaced apart along the length direction of the positioning bracket 81 and in the extension direction of the lower outer tube arc groove 621 .

[0060] One end of the positioning bracket 81 is close to the outer tube clamping mechanism 6, and the other end of the positioning bracket 81 is provided with an end limit assembly; the end limit assembly includes an end limit plate 83 and a screw 84; the end limit plate 83 is used for the end of the outer tube 92 to abut and position; the screw 84 is threadedly connected to the positioning bracket 81, and can be rotated and moved along the length direction of the positioning bracket 81 to adjust the position to adapt to outer tubes 92 of different lengths.

[0061] like Figure 1-8 As shown, the workflow of this technical solution is as follows:

[0062] 1. If Figure 1 As shown, in the initial state: the push rod 22 of the inner tube output mechanism 2 is in the material receiving position; the conveying clamp 31 of the inner tube conveying mechanism 3 is located at the discharge station 11, in the raised position and in the separated state. At this time, the clamping block 311 of the conveying clamp 31 is located in the space between the supporting parts 215; the inner tube pressing mechanism 5 and the outer tube pressing mechanism 6 are in the open state; the push rod 71 of the inner tube pushing mechanism 7 is in the retracted position;

[0063] 2. If Figure 1 As shown, multiple inner tubes 91 are placed in the receiving chamber 211 of the silo 21; an outer tube 92 is placed on the outer tube positioning mechanism 8, one end of the outer tube 92 is placed in the lower outer tube arc groove 621 of the outer tube pressing mechanism 6, and the other end of the outer tube 92 is abutted against the end limit plate 83;

[0064] 3. If Figure 3 As shown, the assembly machine is started, and the ejector rod 22 of the inner tube output mechanism 2 rises to the discharge position, and an inner tube 91 is ejected from the discharge port 20; Figure 4 As shown, the inner tube 91 falls onto the supporting portion 215 , and the two clamping portions of the conveying fixture 31 are respectively located on both sides of the inner tube 91 to facilitate receiving the inner tube 91 and prevent the inner tube 91 from falling;

[0065] 4. The conveying fixture 31 is then switched to a clamping state to clamp the inner tube 91;

[0066] 5. Driven by the sliding drive mechanism 36 , the conveying fixture 31 slides from the discharge station 11 to the assembly station 12 . At this time, the end of the inner tube 91 is located between the upper inner tube pressing block 51 and the lower inner tube pressing block 52 .

[0067] 6. If Figure 5 and Figure 7 As shown, after the inner tube 91 arrives at the assembly station 12, the conveying fixture 31 switches to the lowered position, so that the inner tube 91 and the outer tube 92 are opposite each other, and the inner tube pressing mechanism 5 switches to the pressing state to press and fix the inner tube 91. At the same time, the outer tube pressing mechanism 6 also switches to the pressing state to press and fix the outer tube 92.

[0068] 7. If Figure 6 and Figure 8 As shown, after the inner tube 91 and the outer tube 92 are fixed, the conveying fixture 31 is switched to the separated state, and the push rod 71 of the inner tube pushing mechanism 7 is switched to the pushing position to apply pressure to the inner tube 91. At this time, the inner tube fixing mechanism 4 is switched back to the open state to reduce the movement resistance of the inner tube 91.

[0069] 8. After the inner tube 91 is assembled in place, the push rod 71 switches back to the retracted position; the conveying fixture 31 returns to the discharge station and then rises, and the above operation is repeated.

[0070] The above preferred embodiments should be regarded as examples of the implementation methods of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on it should be regarded as within the scope of protection of this patent.

Claims

1. A seat frame tube automatic assembly machine, characterized in that: It includes a workbench, an inner tube output mechanism, an inner tube conveying mechanism, a fixing mechanism and an inner tube pushing mechanism; The workbench is provided with a discharging station and an assembly station; The inner tube output mechanism is arranged at the discharging station for outputting the inner tube; The inner tube conveying mechanism is used to convey the inner tube output from the discharging station to the assembly station; The fixing mechanism is arranged at the assembly station, and the fixing mechanism includes an inner tube pressing mechanism and an outer tube pressing mechanism arranged in parallel, the inner tube pressing mechanism is used to press and fix the inner tube transported to the assembly station, and the outer tube pressing mechanism is used to press and fix the outer tube located at the assembly station; The inner tube pushing mechanism is arranged at one side of the assembly station and is opposite to the inner tube pressing mechanism, so as to be used for pushing the inner tube into the outer tube.

2. The seat frame tube automatic assembly machine according to claim 1, characterized in that: The inner tube output mechanism includes a silo and a discharge mechanism; The silo has a receiving cavity for receiving the inner tube and a discharge port connected to the receiving cavity for discharging the inner tube; The discharge port is located at the top of the front end of the receiving cavity; The discharging mechanism includes a push rod; The receiving cavity comprises a bottom wall, and the push rod is movably arranged up and down through the front end of the bottom wall of the receiving cavity to be close to or away from the discharge port.

3. The automatic assembly machine for seat frame tubes according to claim 2, characterized in that: The bottom wall of the receiving chamber includes an inclined section that slopes from its rear end to its front end and a horizontal section connected to the front of the inclined section. The inclined section causes the inner tube in the receiving chamber to have a tendency to roll toward the front end of the receiving chamber. The horizontal section is for placing an inner tube. The horizontal section is provided with a through hole for the ejector rod to pass through, and the ejector rod moves up and down in the through hole to switch between a material discharging position and a material receiving position; The accommodating cavity includes a vertical front end wall; the top surface of the push rod is an inclined surface sloping downward from back to front; when the push rod is in the discharging position, the top surface of the push rod reaches the discharging port; when the push rod is in the receiving position, the top surface of the push rod falls into the through hole.

4. The automatic assembly machine for seat frame tubes according to claim 3, characterized in that: The front side of the discharge port is provided with a discharge guide plate extending downwardly in an inclined manner; when the ejector rod is in the discharge position, the top surface of the ejector rod is engaged with the discharge guide plate; The discharge port extends along both sides of the silo; Supporting parts for supporting the two ends of the inner tube are provided on both sides of the silo below the discharge guide plate.

5. The automatic assembly machine for seat frame tubes according to claim 4, characterized in that: The discharging mechanism also includes a lifting frame and a discharging driving mechanism; The discharging drive mechanism includes two, which are separated on both sides of the silo; The two ends of the lifting frame are respectively connected to the two discharging drive mechanisms, and the push rods include at least two, and the bottom of each push rod is fixed on the lifting frame; The discharging drive mechanism is used to drive the lifting frame to move up and down to drive the push rod to move up and down.

6. The automatic assembly machine for seat frame tubes according to any one of claims 1 to 5, characterized in that: The inner tube conveying mechanism includes a conveying fixture, a slide rail, a slide table and a sliding drive mechanism; The slide rail is fixed on the workbench, and the slide table is slidably assembled on the slide rail; the slide drive mechanism is connected to the slide table to drive the slide table to slide back and forth along the slide rail. The conveying fixture is mounted on the slide and slides synchronously with the slide to move between the discharge station and the assembly station; The conveying fixture includes two clamping blocks, which can move closer to or farther away from each other so that the conveying fixture can be switched between a clamping state and a separation state; When the conveying clamp slides to the discharge station, it is located below the discharge port to clamp the inner tube discharged from the discharge port.

7. The automatic assembly machine for seat frame tubes according to claim 6, characterized in that: The inner tube conveying mechanism also includes a lifting platform and a lifting drive mechanism; The lifting drive mechanism is installed on the slide, and the lifting platform is connected to the lifting drive mechanism and is driven by the lifting drive mechanism to move up and down; The conveying fixture is installed on the lifting platform and rises and falls synchronously with the lifting platform to switch between an ascending position and a descending position.

8. The automatic assembly machine for seat frame tubes according to claim 7, characterized in that: The fixing mechanism also includes a fixing frame fixed on the workbench; The inner tube clamping mechanism includes an upper inner tube clamping block, an inner tube upper driving mechanism, a lower inner tube clamping block and an inner tube lower driving mechanism; the upper inner tube clamping block is located above the lower inner tube clamping block, and the upper inner tube clamping block and the lower inner tube clamping block can move closer to or farther away from each other so that the inner tube clamping mechanism switches between a clamping state and an open state; the inner tube upper driving mechanism is installed on a fixed frame, the upper inner tube clamping block is connected to the inner tube upper driving mechanism; the inner tube lower driving mechanism is installed on a workbench, and the lower inner tube clamping block is connected to the inner tube lower driving mechanism; the upper inner tube clamping block and the lower inner tube clamping block are respectively driven by the inner tube upper driving mechanism and the inner tube lower driving mechanism to move up and down to move closer to or farther away from each other; The outer tube clamping mechanism comprises an upper outer tube clamping block, an outer tube upper driving mechanism and a lower outer tube clamping block; the lower outer tube clamping block is fixed to a workbench for supporting the outer tube; the upper outer tube clamping block is located above the lower outer tube clamping block, and the upper outer tube clamping block can be close to or away from the lower outer tube clamping block to switch the outer tube clamping mechanism between a clamping state and an open state; the outer tube upper driving mechanism is installed on a fixing frame, and the outer tube upper driving mechanism is connected with the upper outer tube clamping block to drive the upper outer tube clamping block to move up and down to approach or move away from the lower outer tube clamping block; the lower inner tube clamping block is provided with a lower inner tube arc groove, and the upper inner tube clamping block is provided with an upper inner tube arc groove; the lower outer tube clamping block is provided with a lower outer tube arc groove, and the upper outer tube clamping block is provided with an upper outer tube arc groove; when the upper inner tube clamping block and the lower inner tube clamping block are in the clamping state, the lower inner tube arc groove is consistent in height and coaxial with the lower outer tube arc groove; The upper inner tube pressing block is provided with a guide protrusion, and the upper outer tube pressing block is provided with a guide groove corresponding to the shape of the guide protrusion. The guide protrusion is installed in the guide groove and moves up and down along the guide groove.

9. The automatic assembly machine for seat frame tubes according to claim 8, characterized in that: The inner tube pushing and installing mechanism includes a push rod and a horizontal pushing drive mechanism; The push rod is radially movable to switch between an ejection position close to the inner tube pressing mechanism and a retracted position away from the inner tube pressing mechanism; The horizontal push driving mechanism is installed on the workbench, and the push rod is connected to the horizontal push driving mechanism and is driven by the horizontal push driving mechanism to move radially.

10. The automatic assembly machine for seat frame tubes according to claim 9, characterized in that: Also included is an outer tube positioning mechanism; The outer tube positioning mechanism is arranged on the other side of the assembly station and is opposite to the outer tube pressing mechanism; The outer tube positioning mechanism includes a positioning bracket; the positioning bracket is provided with a plurality of positioning recesses; the positioning recesses are spaced apart along the length direction of the positioning bracket and in the extension direction of the arc-shaped groove of the lower outer tube; One end of the positioning bracket is close to the outer tube pressing mechanism, and the other end of the positioning bracket is provided with an end limit assembly; The end limit assembly includes an end limit plate and a screw; the end limit plate is used for the end of the outer tube to abut and position; the screw is threadedly connected to the positioning bracket and can be rotated and moved along the length direction of the positioning bracket to adjust the position.

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