Front-end tube pushing mechanism of a tube threading machine

Abstract

The application discloses a front-end pipe-putting mechanism of a pipe threading machine, which comprises a pipe-putting frame, a conveying table, a pipe-putting frame and an intermittent pipe-feeding mechanism. The pipe-putting frame is provided with a conveying belt and a side pushing mechanism. The conveying belt is used for conveying the heat exchange pipe forward, and the side pushing mechanism is used for blocking the heat exchange pipe from advancing and pushing the heat exchange pipe into the next process from the side. One side of the conveying table is connected with the pipe-putting frame and is arranged in an open mode. An outlet for the heat exchange pipe to pass through is formed in one side below the conveying table. The heat exchange pipe is entered from above the conveying table by the side pushing mechanism and is discharged from the outlet. The top of the pipe-putting frame is provided with a pipe-putting cylinder and a manifold base. Compared with the prior art, the pipe-putting mechanism has the advantages that the manual operation method is replaced to realize the actions of placing the heat exchange pipe on the pipe threading machine, aligning the heat exchange pipe with the hole position on the pipe threading machine and pushing the heat exchange pipe into the hole of the pipe threading machine, the labor intensity is reduced, the efficiency is improved, and the automatic production is facilitated.

Description

Technical Field

[0001] This invention relates to the field of tube threading technology, and in particular to a tube pushing mechanism at the front end of a tube threading machine. Background Technology

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food, and many other industrial production processes. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators, and reboilers, and are widely applied.

[0003] Heat exchangers encompass numerous categories. Common types of tubular heat exchangers include fixed tubesheet heat exchangers, floating head heat exchangers, and U-tube heat exchangers. Tubular heat exchangers include different types of baffles, such as square or circular, depending on specific requirements. Baffles are plates used to change the direction of fluid flow and are commonly used in the design of the shell-side medium flow path in tubular heat exchangers. The number of baffles is determined based on the medium properties, flow rate, and the size of the heat exchanger. Baffles are located on the shell side, improving heat transfer efficiency and supporting the tube bundle. Baffles come in two types: arc-shaped and disc-ring-shaped. Arc-shaped baffles include single-arc, double-arc, and triple-arc designs. Baffles have tens of thousands to hundreds of thousands of perforations, each containing a heat exchange tube, with both ends of the tube fixed to the tubesheet.

[0004] The emergence of heat exchanger tube threading machines has reduced labor costs and improved threading efficiency to some extent. However, in current technology, the threading of heat exchanger tubes on the machine is mostly done manually. This involves placing the heat exchanger tube on the machine, aligning it with the holes, and then pushing the tube through the holes. This method is labor-intensive, inefficient, and prone to damaging the heat exchanger tubes. Inexperienced employees are also unable to perform this task effectively, which is not conducive to automated production. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a tube-pushing mechanism at the front end of a tube-threading machine, which replaces manual operation to place the heat exchange tube on the tube-threading machine and align it with the hole on the tube-threading machine, and push the heat exchange tube into the hole of the tube-threading machine. This reduces labor intensity, improves efficiency, and is conducive to automated production.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a tube pushing mechanism at the front end of a tube threading machine, comprising:

[0007] The upper tube rack is equipped with a conveyor belt and a side-pushing mechanism. The conveyor belt is used to transport the heat exchange tubes forward, and the side-pushing mechanism is used to block the heat exchange tubes from moving forward and push the heat exchange tubes from the side into the next process.

[0008] A conveyor platform is connected to an upper pipe rack on one side and is open-type. An outlet for heat exchange tubes to pass through is provided on one side below the conveyor platform. The heat exchange tubes are pushed in from above the conveyor platform by a side-pushing mechanism and discharged from the opening.

[0009] A tube pusher is provided with a tube pusher cylinder and a manifold seat on its top. A tube pusher mechanism is installed on the movable end of the tube pusher cylinder. The tube pusher mechanism pushes the heat exchange tubes in the manifold seat toward the tube threading machine.

[0010] An intermittent pipe feeding mechanism is installed between the manifold seat and the conveying platform to intermittently transfer the heat exchange tubes from the conveying platform into the manifold seat.

[0011] In some embodiments, the side-pushing mechanism includes:

[0012] L-shaped baffle, which is installed on the upper tube frame and located at the end of the conveyor belt;

[0013] Upper pipe cylinder, the upper pipe cylinder is installed on one side of the L-shaped baffle;

[0014] A lateral push plate is installed on the movable end of the upper cylinder.

[0015] In some embodiments, the tube pushing mechanism includes:

[0016] A transverse push plate, which is fixedly installed at the movable end of the push tube cylinder;

[0017] A clamping assembly that clamps the heat exchange tube during the tube pushing process.

[0018] In some embodiments, the manifold seat has a through groove, and the upper and lower sides of the manifold seat have sliding grooves. The transverse push plate can be divided into two parts located inside and outside the manifold seat and moves through the through groove. The two sides of the transverse push plate located outside the manifold seat are respectively connected to the clamping assembly and the push cylinder.

[0019] In some embodiments, the clamping assembly includes:

[0020] A connecting seat, which is fixedly installed on one side of the transverse push plate;

[0021] Two limiting posts are fixedly installed on both sides of the connecting seat.

[0022] A clamping arm is slidably disposed on the outer wall of the limiting column, and one end of the clamping arm can pass through the sliding groove to contact the heat exchange tube;

[0023] A clamping cylinder is installed in a connecting seat. The movable end of the clamping cylinder passes through the connecting seat and is fixedly provided with a connecting plate. A connecting rod is hinged between the connecting plate and the clamping arm.

[0024] In some embodiments, a detection switch is installed on the top of the pusher, which can detect the position of the clamping assembly and control the extension and retraction of the clamping cylinder.

[0025] In some embodiments, the intermittent tube feeding mechanism includes:

[0026] A connecting frame is installed above the pusher frame, and the connecting frame is respectively connected to the outlet of the conveyor table and the inlet of the manifold seat;

[0027] A rotating shaft, which is rotatably mounted within a connecting frame;

[0028] A plurality of conveying rollers are fixedly sleeved on the outer wall of the rotating shaft and spaced apart along the length of the rotating shaft. Each conveying roller has a circumferentially arrayed receiving groove for supporting the heat exchange tube.

[0029] The Geneva drive mechanism is mounted on the pusher frame and drives the rotating shaft to drive the material conveying wheel to rotate intermittently.

[0030] In some embodiments, the Geneva drive mechanism includes:

[0031] A drive motor, which is mounted on top of the push tube frame;

[0032] Driven wheel, the driven wheel is fixedly sleeved on one end of the rotating shaft, and the driven wheel has three slots arranged in a circumferential array;

[0033] A drive pin, one end of which is fixedly mounted on the output shaft of the drive motor, and the other end of which can extend into the groove of the driven wheel.

[0034] In some embodiments, a sealing plate is provided at one end of the heat exchange tube output from the manifold. The sealing plate is hinged to the manifold via a hinge. Magnets are fixedly provided on the lower side of the sealing plate facing the manifold and on the corresponding manifold at that location. The magnetic attraction between the two magnets allows the heat exchange tube to lift the sealing plate when the tube is pushed.

[0035] In some embodiments, the inside of the manifold is lined with felt.

[0036] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0037] 1. Place several heat exchange tubes to be processed on the conveyor belt along their length. The conveyor belt moves them forward and into contact with the L-shaped baffle. The upper tube cylinder drives the side pusher to push the heat exchange tubes gathered on one side of the L-shaped baffle toward the conveyor table. The heat exchange tubes pass through the conveyor table and are discharged from the opening below it. Only one heat exchange tube can be discharged from the opening at a time, so as to achieve orderly feeding of heat exchange tubes.

[0038] 2. When the heat exchange tube passes through the conveyor table and enters the connecting frame, it will fall into the receiving groove on the conveying wheel. The Geneva drive mechanism can make the conveying wheel drive the heat exchange tube to rotate intermittently by one-third of a circle. At this time, the heat exchange tube in the receiving groove will fall into the manifold seat. Another receiving groove on the conveying wheel moves to the opening below the conveyor table to continue feeding, realizing the intermittent and orderly conveying of the heat exchange tube.

[0039] 3. After the heat exchange tube falls into the manifold, the clamping assembly passes through the slide groove to clamp the heat exchange tube. The tube pushing cylinder drives the horizontal pushing plate and the clamping mechanism to move the heat exchange tube forward. The direction of the heat exchange tube forward is aligned with the hole on the tube threading machine, that is, the heat exchange tube is pushed into the hole of the tube threading machine.

[0040] 4. During the forward movement, when the clamping component is pushed forward to the detection area of ​​the detection switch, the detection switch issues a command to control the clamping component to release the heat exchange tube, which will not affect subsequent processes.

[0041] 5. The method of replacing manual operation realizes the action of placing the heat exchange tube on the tube threading machine and aligning it with the hole on the tube threading machine, and pushing the heat exchange tube into the hole of the tube threading machine, which reduces labor intensity, improves efficiency, and is conducive to automated production. Attached Figure Description

[0042] Figure 1 This is a three-dimensional schematic diagram of the entire invention;

[0043] Figure 2 This is a partial three-dimensional schematic diagram of the present invention;

[0044] Figure 3 This is a schematic diagram of the connection structure of the conveying platform, intermittent pipe feeding mechanism and pipe pushing mechanism of the present invention;

[0045] Figure 4 This is a three-dimensional schematic diagram of the intermittent pipe feeding mechanism of the present invention;

[0046] Figure 5 This is a three-dimensional schematic diagram of the connection between the manifold seat and the clamping assembly of the present invention;

[0047] Figure 6 This is a three-dimensional schematic diagram of the clamping component of the present invention;

[0048] Figure 7 This is a three-dimensional schematic diagram of the side-pushing mechanism of the present invention.

[0049] Explanation of the labels in the diagram:

[0050] 100. Upper pipe rack; 101. Conveyor belt; 102. L-shaped baffle; 103. Upper pipe cylinder; 104. Side push plate; 200. Conveying table; 300. Pipe pusher; 301. Pipe pusher cylinder; 302. Manifold seat; 3021. Through groove; 3022. Slide groove; 3023. Sealing plate; 303. Horizontal push plate; 304. Connecting seat; 305. Limiting post; 306. Clamping arm; 307. Clamping cylinder; 308. Connecting plate; 309. Connecting rod; 400. Intermittent pipe feeding mechanism; 401. Connecting frame; 402. Rotating shaft; 403. Feeding wheel; 404. Receiving trough; 405. Drive motor; 406. Driven wheel; 407. Drive pin; 408. Groove opening; 500. Detection switch. Detailed Implementation

[0051] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0052] Example:

[0053] like Figure 1 - Figure 7 As shown, this embodiment proposes a pipe-pushing mechanism at the front end of a pipe threading machine. The pipe-pushing mechanism at the front end of a pipe threading machine includes a pipe-upper frame 100, a conveying table 200, a pipe-pushing frame 300, and an intermittent pipe-feeding mechanism 400.

[0054] The upper tube rack 100 is equipped with a conveyor belt 101 and a side-pushing mechanism. The conveyor belt 101 is used to transport the heat exchange tubes forward, and the side-pushing mechanism is used to block the heat exchange tubes from moving forward and push them from the side into the next process. One side of the conveyor table 200 is connected to the upper tube rack 100 and is open. An outlet for the heat exchange tubes to pass through is opened on the lower side of the conveyor table 200. The heat exchange tubes are entered from above the conveyor table 200 by the side-pushing mechanism and discharged from the opening. The top of the tube pusher 300 is equipped with a tube pusher cylinder 301 and a manifold seat 302. The movable end of the tube pusher cylinder 301 is equipped with a tube pusher mechanism, which pushes the heat exchange tubes in the manifold seat 302 toward the tube threading machine. An intermittent tube feeding mechanism 400 is installed between the manifold seat 302 and the conveyor table 200 to intermittently transfer the heat exchange tubes from the conveyor table 200 to the manifold seat 302.

[0055] Preferably, the side-pushing mechanism includes an L-shaped baffle 102, an upper tube cylinder 103, and a side-pushing plate 104. The L-shaped baffle 102 is installed on the upper tube frame 100 and located at the end of the conveyor belt 101. The upper tube cylinder 103 is installed on one side of the L-shaped baffle 102, and the side-pushing plate 104 is installed at the movable end of the upper tube cylinder 103.

[0056] Specifically, after the L-shaped baffle 102 blocks the heat exchange tube, the upper tube cylinder 103 extends and drives the side push plate 104, which can push the heat exchange tube blocked by the L-shaped baffle 102 on the conveyor belt 101 to the conveyor table 200.

[0057] Preferably, the pipe-pushing mechanism includes a transverse push plate 303 and a clamping assembly. The clamping assembly includes a connecting seat 304, two limiting posts 305, a clamping arm 306, and a clamping cylinder 307. A through groove 3021 is provided on the manifold seat 302, and sliding grooves 3022 are provided on both the upper and lower sides of the manifold seat 302. The transverse push plate 303 can be divided into two parts located inside and outside the manifold seat 302 and moves through the through groove 3021. The two sides of the transverse push plate 303 located outside the manifold seat 302 are respectively connected to the clamping assembly and the pipe-pushing cylinder. The cylinder 301 is connected, the connecting seat 304 is fixedly installed on one side of the transverse push plate 303, the two limiting posts 305 are fixedly installed on both sides of the connecting seat 304, the clamping arm 306 is slidably installed on the outer wall of the limiting post 305, one end of the clamping arm 306 can pass through the slide groove 3022 to contact the heat exchange tube, the clamping cylinder 307 is installed in the connecting seat 304, the movable end of the clamping cylinder 307 passes through the connecting seat 304 and is fixedly installed with a connecting plate 308, and a connecting rod 309 is hinged between the connecting plate 308 and the clamping arm 306;

[0058] Specifically, the extension and retraction of the clamping cylinder 307 can drive the connecting plate 308 to pull the connecting rod 309. The connecting rod 309 pulls the clamping arm 306 to slide up and down along the limiting post 305. The clamping arm 306 passes through the sliding groove 3022 to clamp or release the heat exchange tube. During the tube pushing process, the clamping component clamps the heat exchange tube and advances the tube pushing cylinder 301.

[0059] Preferably, a detection switch 500 is installed on the top of the pusher 300. The detection switch 500 can detect the position of the clamping component and control the extension and retraction of the clamping cylinder 307.

[0060] Specifically, when the clamping assembly is pushed forward to the detection area of ​​the detection switch 500, the detection switch 500 issues a command to control the clamping assembly to release the heat exchange tube.

[0061] Preferably, the intermittent pipe feeding mechanism 400 includes a connecting frame 401, a rotating shaft 402, conveying wheels 403, and a Geneva drive mechanism. The Geneva drive mechanism consists of a drive motor 405, a driven wheel 406, and a drive pin 407. The connecting frame 401 is installed above the pusher frame 300 and is respectively connected to the outlet of the conveyor table 200 and the inlet of the manifold seat 302. The rotating shaft 402 is rotatably disposed within the connecting frame 401. A plurality of conveying wheels 403 are fixedly sleeved on the outer wall of the rotating shaft 402 and spaced apart along the length of the rotating shaft 402. The tube pusher 300 has a circumferentially arrayed receiving groove 404 for supporting the heat exchange tubes. The Geneva drive mechanism is mounted on the tube pusher 300 and drives the rotating shaft 402 to drive the conveying wheel 403 to rotate intermittently. The drive motor 405 is mounted on the top of the tube pusher 300. The driven wheel 406 is fixedly sleeved on one end of the rotating shaft 402. The driven wheel 406 has three circumferentially arrayed slots 408. One end of the drive pin 407 is fixedly mounted on the output shaft of the drive motor 405, and the other end of the drive pin 407 can extend into the slot 408 of the driven wheel 406.

[0062] Specifically, the drive motor 405 drives the drive pin 407 to extend into the slot 408 of the driven wheel 406, which can drive the driven wheel 406 to rotate intermittently, thereby driving the rotating shaft 402 to make the feeding wheel 403 follow the rotation, and intermittently feeding the heat exchange tube.

[0063] Preferably, a sealing plate 3023 is provided at one end of the heat exchange tube output from the manifold 302. The sealing plate 3023 is hinged to the manifold 302 via a hinge. Magnets are fixedly provided on the lower side of the sealing plate 302 facing the manifold 302 and on the corresponding manifold 302. The magnetic attraction between the two magnets allows the heat exchange tube to lift the sealing plate 3023 when the tube is pushed. Felt is pasted inside the manifold 302.

[0064] Specifically, the sealing plate 3023 serves as a temporary seal, while the felt reduces wear.

[0065] Working principle and usage process of this invention:

[0066] Several heat exchange tubes to be processed are placed on the conveyor belt 101 along their length. The conveyor belt 101 moves them forward and they come into contact with the L-shaped baffle 102. The upper tube cylinder 103 drives the side push plate 104 to push the heat exchange tubes gathered on one side of the L-shaped baffle 102 toward the conveyor table 200. The heat exchange tubes pass through the conveyor table 200 and are discharged from the opening below it. Only one heat exchange tube can be discharged from the opening at a time, so as to achieve orderly feeding of heat exchange tubes.

[0067] When the heat exchange tube passes through the conveyor 200 and enters the connecting frame 401, it will fall into the receiving groove 404 on the conveying wheel 403. The Geneva drive mechanism can make the conveying wheel 403 drive the heat exchange tube to rotate one-third of a circle intermittently. At this time, the heat exchange tube in the receiving groove 404 will fall into the manifold seat 302. Another receiving groove 404 on the conveying wheel 403 moves to the opening below the conveyor 200 to continue feeding, so as to realize the intermittent and orderly conveying of the heat exchange tube.

[0068] After the heat exchange tube falls into the manifold 302, the clamping assembly passes through the slide groove 3022 to clamp the heat exchange tube. The push cylinder 301 drives the transverse push plate 303 and the clamping mechanism to move the heat exchange tube forward. The forward direction of the heat exchange tube is aligned with the hole on the tube threading machine, that is, the heat exchange tube is pushed into the hole of the tube threading machine. During the forward movement, when the clamping assembly is pushed forward to the detection area of ​​the detection switch 500, the detection switch 500 issues a command to control the clamping assembly to release the heat exchange tube, which will not affect the subsequent process.

[0069] The method that replaces manual operation involves placing the heat exchange tubes on the tube threading machine, aligning them with the holes on the machine, and pushing the heat exchange tubes through the holes. This reduces labor intensity, increases efficiency, and facilitates automated production.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tube-pushing mechanism at the front end of a tube-threading machine, characterized in that, include: The upper tube rack (100) is equipped with a conveyor belt (101) and a side-pushing mechanism. The conveyor belt (101) is used to transport the heat exchange tubes forward, and the side-pushing mechanism is used to block the heat exchange tubes from moving forward and push the heat exchange tubes from the side into the next process. A conveyor platform (200) is connected to an upper tube rack (100) on one side and is arranged in an open manner. An outlet for heat exchange tubes to pass through is provided on one side below the conveyor platform (200). The heat exchange tubes are pushed in from above the conveyor platform (200) by a side-pushing mechanism and discharged from the opening. A tube pusher (300) is provided with a tube pusher cylinder (301) and a manifold seat (302) on its top. A tube pusher mechanism is installed on the movable end of the tube pusher cylinder (301). The tube pusher mechanism pushes the heat exchange tubes in the manifold seat (302) toward the tube threading machine. Intermittent pipe feeding mechanism (400), which is installed between manifold seat (302) and conveying table (200), intermittently transfers heat exchange tubes from conveying table (200) to manifold seat (302); The tube pushing mechanism includes: A transverse push plate (303) is fixedly installed at the movable end of the push tube cylinder (301); A clamping assembly that clamps the heat exchange tube as it advances during the tube pushing process; The manifold seat (302) is provided with a through groove (3021), and the manifold seat (302) is provided with sliding grooves (3022) on both the upper and lower sides. The transverse push plate (303) is divided into two parts located inside and outside the manifold seat (302) and moves through the through groove (3021). The two sides of the transverse push plate (303) located outside the manifold seat (302) are respectively connected to the clamping assembly and the push cylinder (301). The clamping assembly includes: A connecting seat (304) is fixedly installed on one side of the transverse push plate (303); Two limiting posts (305) are fixedly disposed on both sides of the connecting seat (304); A clamping arm (306) is slidably disposed on the outer wall of the limiting post (305), and one end of the clamping arm (306) can pass through the sliding groove (3022) to contact the heat exchange tube; A clamping cylinder (307) is installed in a connecting seat (304). The movable end of the clamping cylinder (307) passes through the connecting seat (304) and is fixedly provided with a connecting plate (308). A connecting rod (309) is hinged between the connecting plate (308) and the clamping arm (306).

2. The tube pushing mechanism at the front end of a tube threading machine according to claim 1, characterized in that, The side-pushing mechanism includes: L-shaped baffle (102), the L-shaped baffle (102) is installed on the upper tube frame (100) and located at the end of the conveyor belt (101); Upper pipe cylinder (103), the upper pipe cylinder (103) is installed on one side of L-shaped baffle (102); A side push plate (104) is installed on the movable end of the upper pipe cylinder (103).

3. The tube pushing mechanism at the front end of a tube threading machine according to claim 1, characterized in that: A detection switch (500) is installed on the top of the pusher (300), which can detect the position of the clamping assembly and control the extension and retraction of the clamping cylinder (307).

4. The tube pushing mechanism at the front end of a tube threading machine according to claim 1, characterized in that, The intermittent tube delivery mechanism (400) includes: A connecting frame (401) is installed above the pusher frame (300), and the connecting frame (401) is respectively connected to the outlet of the conveyor table (200) and the inlet of the manifold seat (302); A rotating shaft (402) is rotatably mounted within a connecting frame (401); A plurality of conveying wheels (403) are fixedly sleeved on the outer wall of the rotating shaft (402) and spaced apart along the length of the rotating shaft (402). The conveying wheels (403) are provided with circumferentially arrayed receiving grooves (404) for supporting heat exchange tubes. Geneva drive mechanism, which is mounted on push tube frame (300) and drives shaft (402) to drive material conveyor wheel (403) to perform intermittent rotation.

5. The tube pushing mechanism at the front end of a tube threading machine according to claim 4, characterized in that, The Geneva drive mechanism includes: A drive motor (405) is mounted on top of the push tube frame (300); Driven wheel (406), the driven wheel (406) is fixedly sleeved on one end of the rotating shaft (402), and the driven wheel (406) has three slots (408) arranged in a circular array. A drive pin (407) is provided, one end of which is fixedly mounted on the output shaft of the drive motor (405), and the other end of which can extend into the slot (408) of the driven wheel (406).

6. The tube pushing mechanism at the front end of a tube threading machine according to claim 1, characterized in that: A sealing plate (3023) is provided at one end of the heat exchange tube output from the manifold (302). The sealing plate (3023) is hinged to the manifold (302) via a hinge. Magnets are fixedly provided on the lower side of the sealing plate (302) facing the manifold (302) and on the corresponding manifold (302). The magnetic attraction between the two magnets allows the heat exchange tube to lift the sealing plate (3023) when the tube is pushed.

7. The tube pushing mechanism at the front end of a tube threading machine according to claim 1, characterized in that: The inside of the manifold seat (302) is covered with felt.

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