Pipe expanding and sliding tool

Abstract

The application discloses a pipe expanding and sliding-tightening tool and belongs to the technical field of pipe connecting tools, and the technical scheme is as follows: the tool comprises a shell, a valve seat, a support, a central shaft, an expanding mechanism and a sliding-tightening mechanism; the valve seat is rotatably arranged on the support, the support is arranged in the shell, the inner end of the central shaft penetrates through the valve seat and is connected with the support, and the central shaft is internally provided with an oil channel; a ring groove is formed in the support, the groove bottom of the ring groove is inclined and forms a height difference; a branch channel one, a branch channel two and a connecting cavity are formed in the valve seat, a needle valve one for controlling the branch channel one and a needle valve two for controlling the branch channel two are arranged in the valve seat, the expanding mechanism and the sliding-tightening mechanism are arranged on the valve seat, the oil in the branch channel one controls the working of the expanding mechanism after the needle valve one is opened, and the oil in the branch channel two controls the working of the sliding-tightening mechanism after the needle valve two is opened. The tool can switch the expanding mechanism or the sliding-tightening mechanism, is convenient to use and has low labor intensity.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe connection tools, and specifically relates to a pipe flaring and tightening tool. Background Technology

[0002] In air conditioning, heating, and hot / cold water piping systems, PEX (cross-linked polyethylene) pipes and PAP (aluminum-plastic composite) pipes are commonly used. When connecting the ends of two pipe sections, a relatively safe connection method is often used: the cold expansion and sliding tightening pipe fitting connection process. The steps are as follows: First, the sliding tightening sleeve is fitted onto the expandable pipe. Then, the expanding head of the expander is inserted into the end of the expandable pipe, causing the inner teeth of the expanding head to open outwards to enlarge the end of the expandable pipe. Next, the expander is removed, and the pipe fitting connector is inserted into the enlarged port of the expandable pipe. Finally, the sliding tightening sleeve is slid to the outside of the enlarged port of the expandable pipe, so that the side wall of the enlarged port of the expandable pipe presses against the pipe fitting connector. In other words, each pipe fitting requires both flaring and tightening steps to connect the end of the pipe fitting to the pipe fitting connector.

[0003] For example, Chinese Patent Publication No. CN107795775B discloses an auxiliary assembly device and assembly method for pipe fitting connectors and expandable pipes. The assembly device includes a base, a clamping mechanism, a flaring device, a driving mechanism, and a limiting plate. The clamping mechanism is mounted on the base and is used to clamp or release the expandable pipe. The flaring device includes a rod for pushing into the expandable pipe, the outer diameter of the first end of the rod being smaller than the inner diameter of the expandable pipe. The driving mechanism is used to push the rod of the flaring device into and out of the end opening of the expandable pipe to enlarge the end opening. The driving mechanism includes a push rod and a clamping member. The clamping member is fixedly mounted on the push rod and clamps and cooperates with the flaring device. The base is provided with a groove that cooperates with the push rod, and the push rod is slidably mounted in the groove. The limiting plate is fixedly mounted on the base and has a recess for adapting to the outer wall of the expandable pipe. The limiting plate is used to abut against the end face of a sliding sleeve. Before flaring the end of the expandable pipe, the sliding sleeve is fitted onto the expandable pipe. After flaring the end of the expandable pipe, the clamping mechanism is released, and the flaring device on the clamping member is replaced with a pipe fitting connector. The clamping member then fixes the pipe fitting connector in place, and the push rod drives the clamping member to insert the pipe fitting connector into the end of the expandable pipe. Because the limiting plate always abuts against the sliding sleeve during the insertion of the pipe fitting connector into the end of the expandable pipe, the sliding sleeve is slidably and tightly fitted outside the end of the expandable pipe.

[0004] This type of assembly tool can perform the two steps of flaring and tightening in sequence, but it requires manual control of the push rod. For large-volume, multi-pipe work, this type of assembly tool is quite laborious to use, and the user's labor intensity is high. Existing electric flaring and tightening tools often only have a single flaring or tightening function. Although they can reduce the user's labor intensity, they require the user to carry two tools with flaring and tightening functions at the same time. This is inconvenient to carry and the cost of using the tools is high. Existing pipe assembly tools urgently need to be improved. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a pipe flaring and tightening tool. The technical problem to be solved by this invention is: how to improve the ease of use of pipe connection tools.

[0006] The above-mentioned technical objectives of the present invention can be achieved through the following technical solutions: A pipe flaring and tightening tool includes a housing, a valve seat, a support, a central shaft, a flaring mechanism, and a tightening mechanism. The valve seat is rotatably mounted on the support, which is located within the housing. The inner end of the central shaft passes through the valve seat and connects to the support, while the outer end of the central shaft axially limits the valve seat. The central shaft has an oil passage. The support has an annular groove on its end face facing the valve seat, with the bottom of the groove inclined and forming a height difference. The bottom of the annular groove has a highest point A and a lowest point B. The valve seat has a first branch channel, a second branch channel, and a connecting cavity, which connects the first and second branch channels to the oil passage. The valve seat also includes a needle valve capable of blocking the first branch channel and a needle valve capable of blocking the second branch channel. The second needle valve is a blocking needle valve. The first needle valve includes a slidingly disposed pin one, and the second needle valve includes a slidingly disposed pin two. The lower ends of both pin one and pin two can abut against the annular groove. Pin one and pin two can slide within the annular groove as the valve seat rotates. When pin one or pin two is at its highest point A, pin one controls the opening of the first needle valve, or pin two controls the opening of the second needle valve. When pin one or pin two is at its lowest point B, the corresponding first or second needle valve closes automatically. The flaring mechanism and the sliding tightening mechanism are both disposed on the valve seat. After the first needle valve is opened, the oil in the first branch channel controls the operation of the flaring mechanism. After the second needle valve is opened, the oil in the second branch channel controls the operation of the sliding tightening mechanism.

[0007] In the aforementioned pipe flaring and tightening tool, the valve seat is provided with a guide hole one connecting the first branch channel and a guide hole two connecting the second branch channel. The first ejector pin is slidably disposed in the first guide hole, and the second ejector pin is slidably disposed in the second guide hole.

[0008] In the aforementioned pipe flaring and tightening tool, a first clamping spring is provided in the first guide hole, and the first clamping spring applies a force to the first ejector pin in the direction of the annular groove. A second clamping spring is provided in the second guide hole, and the second clamping spring applies a force to the second ejector pin in the direction of the annular groove. A first sealing ring is provided at the lower end of the first ejector pin, and a second sealing ring is provided at the lower end of the second ejector pin. A first nut is provided at the opening of the first guide hole to limit the first sealing ring, and a second nut is provided at the opening of the second guide hole to limit the second sealing ring.

[0009] In the aforementioned pipe flaring and tightening tools, a limiting groove is provided on the support, and a positioning groove is provided at the bottom of the valve seat that can communicate with the limiting groove. A compression spring and a ball are sequentially arranged in the positioning groove. The compression spring pushes the ball to press against the support. The limiting groove allows up to half of the ball to enter. When the ball enters the limiting groove, the ejector pin one or ejector pin two is located at the highest point A at the bottom of the annular groove.

[0010] In the aforementioned pipe flaring and tightening tools, the central shaft is the rotation center of the valve seat, the outer end of the central shaft has a flange, and the valve seat is provided with a limiting platform that abuts against the flange.

[0011] In the aforementioned pipe flaring and tightening tools, a fixing groove is provided on the outer side of the central shaft, and a fixing bolt is provided on the support, with the inner end of the fixing bolt abutting against the bottom of the fixing groove.

[0012] In the aforementioned pipe flaring and tightening tools, the first branch channel has a limiting surface 1, and the second branch channel has a limiting surface 2. The first needle valve and the second needle valve are symmetrically distributed on both sides of the central axis. The first needle valve also includes a bolt 1, a preload spring 1, and a ball 1. The bolt 1 is connected to the valve seat, and the inner end of the bolt 1 has an assembly groove 1 for placing the preload spring 1 and the ball 1. The preload spring 1 presses the ball 1 against the limiting surface 1, thereby isolating the first branch channel. The ejector pin 1 can push the ball 1 to move. The second needle valve also includes a bolt 2, a preload spring 2, and a ball 2. The bolt 2 is connected to the valve seat, and the inner end of the bolt 2 has an assembly groove 2 for placing the preload spring 2 and the ball 2. The preload spring 2 presses the ball 2 against the limiting surface 2, thereby isolating the second branch channel. The ejector pin 2 can push the ball 2 to move.

[0013] In the aforementioned pipe flaring and tightening tools, the sidewall of the first assembly groove is provided with a plurality of through holes 1 at intervals, and the through holes 1 can connect to the first branch channel; the sidewall of the second assembly groove is provided with a plurality of through holes 2 at intervals, and the through holes 2 can connect to the second branch channel.

[0014] In the aforementioned pipe flaring and tightening tool, the valve seat has an installation cavity 1 that connects to the branch channel 1. The flaring mechanism includes a connector, a piston rod 1, a sleeve, and a return spring 1. The connector is connected to the valve seat. The inner end of the piston rod 1 is slidably disposed in the installation cavity 1. The outer end of the piston rod 1 passes through the connector and is connected to a cone. The sleeve is connected to the connector, and multiple teeth are arranged circumferentially inside the sleeve. Each tooth is located outside the cone, and the cone can push each tooth to open outward. The return spring 1 is disposed in the installation cavity 1 and applies a force to the piston rod 1 pointing towards the bottom of the installation cavity 1.

[0015] In the aforementioned pipe flaring and tightening tool, the valve seat has an installation cavity two that communicates with the branch channel two. The tightening mechanism includes a guide tube, a piston rod two, a fixed seat, a slide seat, and a return spring two. The inner end of the guide tube is connected to the valve seat, and the guide tube communicates with the installation cavity two. The piston rod two is slidably disposed inside the guide tube. The fixed seat is disposed at the outer end of the guide tube. The slide seat is slidably disposed on the outer wall of the guide tube. The slide seat and the piston rod two are connected by a pin. The side wall of the guide tube has a guide groove for the pin. The return spring two is disposed inside the guide tube and applies a force to the piston rod two away from the fixed seat.

[0016] In summary, the advantages of this invention compared to the prior art are as follows: 1. Both the flaring mechanism and the sliding tightening mechanism are mounted on the valve seat. When the flaring mechanism is needed, rotate it forward so that the bottom of the annular groove pushes the first ejector pin upward and opens the first needle valve. Oil from the oil passage can then be supplied to the flaring mechanism, allowing it to operate normally. At this time, the second needle valve is closed, and the sliding tightening mechanism cannot be used. Similarly, when the sliding tightening mechanism is needed, rotate it forward so that the bottom of the annular groove pushes the second ejector pin upward and opens the second needle valve. Oil from the oil passage can then be supplied to the sliding tightening mechanism, allowing it to operate normally. At this time, the first needle valve is closed, and the flaring mechanism cannot be used. This tool can switch between using either the flaring or sliding tightening mechanism, making it more convenient to use and portable, and reducing the user's workload.

[0017] 2. Rotating the valve seat causes the valve seat, flaring mechanism, and sliding mechanism to rotate around the central axis, which controls the opening and closing of needle valve one and needle valve two. The oil passage supplies oil only to branch passage one or branch passage two at a time, reducing interference with the transmission of hydraulic power and improving the stability of the tool.

[0018] 3. The first retaining spring continuously pushes the first ejector pin against the bottom of the annular groove, and the second retaining spring continuously pushes the second ejector pin against the bottom of the annular groove, thereby increasing the rotational friction between the valve seat and the support and preventing the valve seat from rotating freely. Furthermore, the compression spring constantly presses the ball against the support, further increasing the rotational friction between the valve seat and the support. Especially when half of the ball is in the positioning groove and the other half is in the limiting groove, the ball temporarily limits the valve seat and support, further increasing the rotational resistance of the valve seat and ensuring the stability of the connection between branch channel one and branch channel two. Only by increasing the external force applied to the valve seat can the ball be dislodged from the limiting groove.

[0019] 4. When the ejector pin is at the highest point A at the bottom of the annular groove, the ejector pin can rise and push the ball away from the limiting surface. When the ejector pin is at the lowest point B of the annular groove, the pre-tightening spring automatically presses the ball against the limiting surface, thereby separating the branch channel into two independent channels that are not connected. The needle valve 2 has the same structure and working principle as the needle valve 1, and the production and assembly of the two are easier. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of an embodiment; Figure 2 for Figure 1 A cross-sectional view; Figure 3 This is a partial structural schematic diagram of an embodiment; Figure 4 This is one of the cross-sectional schematic diagrams of the valve seat in the embodiment; Figure 5 This is a second cross-sectional view of the valve seat in the embodiment; Figure 6 This is a schematic diagram of the structure of needle valve one in the embodiment; Figure 7 This is a cross-sectional view of needle valve two in the embodiment; Figure 8 This is a schematic diagram illustrating the fit between the valve seat and the support in the embodiment. Figure 9 for Figure 8 Another side sectional view; Figure 10 This is a schematic diagram of the support structure in the embodiment; Figure 11 This is a cross-sectional schematic diagram of the support in the embodiment; Figure 12 This is another structural schematic diagram of the support in the embodiment; Figure 13 for Figure 1 Another sectional view; Figure 14 This is a schematic diagram showing the connection of the connector, sliding sleeve, and pipe. Figure 15 A schematic diagram of pipe flaring; Figure 16 This is a schematic diagram of the structure when the sliding sleeve is tightened.

[0021] Reference numerals: 1. Pipe; 2. Sliding sleeve; 3. Connector; 100. Outer shell; 200, Valve seat; 210, Branch channel one; 211, Limiting surface one; 220, Branch channel two; 221, Limiting surface two; 230, Connecting cavity; 240, Guide hole one; 241, Clamping spring one; 242, Nut one; 250, Guide hole two; 251, Clamping spring two; 252, Nut two; 260, Positioning groove; 261, Compression spring; 262, Ball bearing; 270, Limiting platform; 280, Mounting cavity one; 290, Mounting cavity two; 300, Support; 310, Annular groove; 320, Limiting groove; 330, Fixing bolt; 400, central shaft; 410, oil passage; 420, flange; 430, fixing groove; 510. Hydraulic cylinder; 520. Hydraulic pump; 600. Flaring mechanism; 610. Connector; 620. Piston rod 1; 621. Cone head; 630. Sleeve; 631. Gear plate; 632. Elastic ring; 640. Return spring 1; 700. Sliding mechanism; 710. Guide tube; 711. Guide groove; 720. Piston rod II; 730. Fixed seat; 731. Groove I; 740. Slide; 741. Groove II; 750. Return spring II; 760. Pin; 800. Needle valve; 810. Ejector pin; 811. Sealing ring; 820. Bolt; 821. Assembly slot; 822. Through hole; 830. Preload spring; 840. Ball. 900. Needle valve II; 910. Ejector pin II; 911. Sealing ring II; 920. Bolt II; 921. Assembly groove II; 922. Through hole II; 930. Preload spring II; 940. Ball II. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] A pipe flaring and tightening tool, such as Figures 1-16As shown, the device includes a housing 100, a valve seat 200, a support 300, a central shaft 400, a hydraulic cylinder 510, an oil pump 520, a flaring mechanism 600, and a sliding mechanism 700. The valve seat 200 is rotatably mounted on the support 300. The support 300, hydraulic cylinder 510, and oil pump 520 are housed within the housing 100. The hydraulic cylinder 510 and oil pump 520 are connected to the support 300. The inner end of the central shaft 400 passes through the valve seat 200 and is connected to the support 300. The outer end of the central shaft 400 axially limits the valve seat 200. The central shaft 400 contains an oil pump connected to the oil pump 520. Oil pump 520 pumps oil from cylinder 510 into oil passage 410; support 300 has an annular groove 310 on its end face facing valve seat 200, the annular groove 310 is coaxial with central shaft 400, the bottom of the annular groove 310 is inclined and forms a height difference, the bottom of the annular groove 310 has a highest point A and a lowest point B, the highest point A and the lowest point B are in symmetrical positions; branch passage 1 210, branch passage 220 and connecting cavity 230 are provided in valve seat 200, the connecting cavity 230 connects branch passage 1 210 and branch passage 220 to oil passage 410. A needle valve 800 and a needle valve 900 are provided inside the valve seat 200. The needle valves 800 and 900 are symmetrically distributed on both sides of the central axis 400. The needle valve 800 is used to block the branch channel 210, and the needle valve 900 is used to block the branch channel 220. The needle valve 800 includes a pin 810 that is slidably disposed in the valve seat 200, and the needle valve 900 includes a pin 910 that is slidably disposed in the valve seat 200. The lower ends of the pins 810 and 910 can abut against the annular groove 310, and the pins 810 and 910 can slide in the annular groove 310 as the valve seat 200 rotates. When ejector pin 810 is at the highest point A at the bottom of annular groove 310, ejector pin 810 controls needle valve 800 to open. When ejector pin 910 is at the highest point A at the bottom of annular groove 310, ejector pin 910 controls needle valve 900 to open. When ejector pin 810 is at the lowest point B at the bottom of annular groove 310, needle valve 800 closes automatically. When ejector pin 910 is at the lowest point B at the bottom of annular groove 310, needle valve 900 also closes automatically. Flaring mechanism 600 and sliding mechanism 700 are respectively located on both sides of valve seat 200. After needle valve 800 opens, the oil in branch channel 210 controls flaring mechanism 600 to operate. After needle valve 900 opens, the oil in branch channel 220 controls sliding mechanism 700 to operate.

[0024] In this embodiment, the support 300 is an integral component. For example... Figure 12 As shown, in some embodiments, the support 300 is a split component, that is, the support 300 is produced in the form of multiple parts and then assembled together to be used as the support 300, in order to adapt to different shapes of housing 100 or oil pump 520.

[0025] like Figures 4-8 As shown, the valve seat 200 has a guide hole 240 and a guide hole 250. The guide hole 240 connects to the branch channel 210, and the guide hole 250 connects to the branch channel 220. The ejector pin 810 is slidably disposed in the guide hole 240, and the ejector pin 910 is slidably disposed in the guide hole 250. In this embodiment, the cross-sectional shape of the annular groove 310 is arc-shaped, and the ends of the ejector pins 810 and 910 that contact the annular groove 310 have arc-shaped chamfers to facilitate smooth engagement between the ejector pins 810 and 910 and the annular groove 310.

[0026] A clamping spring 241 is installed inside the guide hole 240, applying a force to the ejector pin 810 in the direction of the annular groove 310. A clamping spring 251 is installed inside the guide hole 250, applying a force to the ejector pin 910 in the direction of the annular groove 310. Specifically, the lower end of the ejector pin 810 is the large-diameter end, and the clamping spring 241 abuts against the large-diameter end of the ejector pin 810, ensuring that the lower end of the ejector pin 810 is always pressed against the bottom of the annular groove 310. The ejector pin 910 has the same structure as the ejector pin 810, that is, the lower end of the ejector pin 910 is the large-diameter end, and the clamping spring 251 abuts against the large-diameter end of the ejector pin 910, ensuring that the lower end of the ejector pin 910 is always pressed against the bottom of the annular groove 310, thereby increasing the rotational friction between the valve seat 200 and the support 300. At the same time, it can also ensure that ejector pin 1 810 and ejector pin 2 910 will not interfere with the normal closing of needle valve 1 800 and needle valve 2 900.

[0027] A sealing ring 811 is fitted at the lower end of ejector pin 810. The sealing ring 811 can prevent oil from entering the annular groove 310 from the guide hole 240. A sealing ring 911 is fitted at the lower end of ejector pin 910. The sealing ring 911 can prevent oil from entering the annular groove 310 from the guide hole 250. A nut 242 is provided at the opening of the guide hole 240 to limit the sealing ring 811. The nut 242 is penetrated by ejector pin 810. A nut 252 is provided at the opening of the guide hole 250 to limit the sealing ring 911. The nut 252 is penetrated by ejector pin 910.

[0028] like Figures 9-11As shown, a limiting groove 320 is provided on the support 300, and a positioning groove 260 is provided at the bottom of the valve seat 200 that can communicate with the limiting groove 320. A compression spring 261 and a ball 262 are arranged in sequence in the positioning groove 260. The compression spring 261 pushes the ball 262 to press against the support 300, and the ball 262 and the positioning groove 260 are in clearance fit, so that the side wall of the positioning groove 260 guides the movement direction of the ball 262. The limiting groove 320 allows up to half of the ball 262 to enter, and the remaining part of the ball 262 is still located at the opening of the positioning groove 260; that is, at this time the ball 262 is stuck between the valve seat 200 and the support 300 to increase the rotational resistance between the valve seat 200 and the support 300. When the ball 262 enters the limiting groove 320, the ejector pin 1 810 or ejector pin 2 910 is located at the highest point A of the bottom of the annular groove 310.

[0029] In some embodiments, at least two positioning grooves 260 are spaced apart, and the number of limiting grooves 320 corresponds one-to-one with the number of positioning grooves 260. Each positioning groove 260 is provided with a compression spring 261 and a ball bearing 262 to further increase the rotational resistance between the valve seat 200 and the support 300.

[0030] like Figures 8-9 As shown, the central shaft 400 is the rotation center of the valve seat 200. The outer end of the central shaft 400 has a flange 420. A limiting platform 270 is provided on the valve seat 200 that abuts against the flange 420. The flange 420 presses against the limiting platform 270 to limit the axial movement of the valve seat 200 without affecting its normal rotation. Furthermore, a fixing groove 430 is provided on the outer side of the inner end of the central shaft 400. A fixing bolt 330 is threaded onto the support 300. The inner end of the fixing bolt 330 abuts against the bottom of the fixing groove 430, thereby improving the connection strength between the central shaft 400 and the support 300, preventing abnormal axial displacement of the central shaft 400 during long-term use, thus ensuring the limiting effect of the flange 420 on the valve seat 200 and improving the stability of the tool.

[0031] like Figures 4-12 As shown, the first branch channel 210 has a limiting surface 211 facing the needle valve 800, and the second branch channel 220 has a limiting surface 221 facing the needle valve 900. In this embodiment, the needle valve 800 and the needle valve 900 have the same structure and the same working mode.

[0032] Specifically, the needle valve 800 also includes a bolt 820, a preload spring 830, and a ball 840. The bolt 820 is detachably connected to the valve seat 200. The inner end of the bolt 820 has an assembly groove 821 for placing the preload spring 830 and the ball 840, and the ball 840 is clearance-fitted with the assembly groove 821. The preload spring 830 presses the ball 840 against the limiting surface 211, thereby isolating both ends of the branch channel 210. At this time, the needle valve 800 is in the closed state. The ejector pin 810 can push the ball 840 away from the limiting surface 211, thereby closing the needle valve 800. 0 Open; Needle valve 2 900 also includes bolt 2 920, preload spring 2 930, and ball 2 940. Bolt 2 920 is detachably connected to valve seat 200. The inner end of bolt 2 920 has an assembly groove 2 921 for placing preload spring 2 930 and ball 2 940. Ball 2 940 is clearance-fitted with assembly groove 2 921. Preload spring 2 930 presses ball 2 940 against limiting surface 2 221, thereby isolating branch channel 2 220. At this time, needle valve 2 900 is in the closed state. Ejector pin 2 910 can push ball 2 940 away from limiting surface 2 221, thereby opening needle valve 2 900.

[0033] During the opening and closing of needle valve 800, ball 840 moves along the length of assembly groove 821. To prevent the opening of assembly groove 821 from being completely blocked by ball 840, thus interfering with its normal movement, several through holes 822 are provided at intervals on the side wall of assembly groove 821. The through holes 822 connect the interior of assembly groove 821 to branch channel 210, ensuring that the internal pressure of assembly groove 821 is approximately the same as that of branch channel 210. Similarly, needle valve 900 opens and closes in the same way as needle valve 800. Ball 940 moves along the length of assembly groove 921, and several through holes 922 are also provided at intervals on the side wall of assembly groove 921. The through holes 922 connect the interior of assembly groove 921 to branch channel 220, thus ensuring that ball 940 can slide normally within assembly groove 921.

[0034] like Figures 4-16As shown, the valve seat 200 has an installation cavity 280 that connects to the branch channel 210. The flaring mechanism 600 includes a connector 610, a piston rod 620, a sleeve 630, and a return spring 640. The connector 610 is connected to the valve seat 200 and covers the installation cavity 280. The inner end of the piston rod 620 is slidably disposed in the installation cavity 280, and the outer end of the piston rod 620 passes through the connector 610 and is connected to a cone 621. The oil in the branch channel 210 can push the piston rod 620 to slide out of the installation cavity 280. The sleeve 630 is connected to the connector 610. In at least one embodiment, the sleeve 630 and the connector 610 are connected together. The sleeve 630 is connected via an adapter and has multiple toothed plates 631 arranged circumferentially inside. Each toothed plate 631 is located outside the cone head 621. The cone head 621 can push each toothed plate 631 to open outward. An elastic ring 632 with elastic deformation properties is provided inside the sleeve 630 and is sleeved on the inner end of each toothed plate 631. The elastic ring 632 is used to retract the opened toothed plates 631 inward. A return spring 640 is provided inside the mounting cavity 280 and applies a force to the piston rod 620 in the direction of the bottom of the mounting cavity 280, so that the piston rod 620 and the cone head 621 can move as a whole away from the toothed plates 631 to reset.

[0035] The sliding sleeve 2 is pre-fitted onto the pipe 1, and the sliding sleeve 2 slides to the end away from the pipe 1. The end of the pipe 1 is inserted into the outside of the toothed piece 631. After each toothed piece 631 opens, it can open and shape the end of the pipe 1, thereby completing the flaring operation of the pipe 1.

[0036] The valve seat 200 has a second mounting cavity 290 that connects to the second branch channel 220. The sliding mechanism 700 includes a guide tube 710, a second piston rod 720, a fixed seat 730, a slide 740, and a second return spring 750. The inner end of the guide tube 710 is connected to the valve seat 200, and the inside of the guide tube 710 connects to the second mounting cavity 290. The second piston rod 720 is slidably disposed within the guide tube 710. The oil in the second branch channel 220 can push the second piston rod 720 to slide towards the fixed seat 730. 730 is detachably fixed to the outer end of the conduit 710. The slide 740 is slidably disposed on the outer wall of the conduit 710. The slide 740 is connected to the piston rod 720 through a pin 760. The side wall of the conduit 710 is provided with a guide groove 711 for the pin 760. The return spring 750 is disposed inside the conduit 710 and applies a force to the piston rod 720 in a direction away from the fixed seat 730, so that the piston rod 720 can drive the slide 740 to move and reset in a direction away from the fixed seat 730.

[0037] like Figures 14-16As shown, the fixed base 730 is further provided with a first groove 731, and the slide 740 is provided with a second groove 741. The flared pipe 1 is inserted into one end of the connector 3. The connector 3 is inserted into the first groove 731 and limited by the first groove 731. The second groove 741 makes way for the pipe 1. The slide 740 can be used for the sliding sleeve 2 to abut. After the slide 740 is close to the fixed base 730, the sliding sleeve 2 can be pushed to the flared position at the end of the pipe 1, so that the sliding sleeve 2 presses the end of the pipe 1 tightly onto the connector 3. Finally, the connector 3 is taken out from the first groove 731, realizing the connection between the pipe 1 and the connector 3. The sliding and tightening operation of the sliding sleeve 2 is completed. The other pipe 1 is flared and then connected to the remaining end of the connector 3, thus realizing the connection between the two sections of pipe 1.

[0038] Connector 3, sliding sleeve 2, and pipe 1 are all existing technologies. The state of the three after connection is as follows: Figure 14 As shown.

[0039] The working principle of this invention is as follows: When the user needs to use the flaring function, first rotate the valve seat 200 to rotate the flaring mechanism 600 to the front of the housing 100, so that the ejector pin 810 rotates to the highest point A of the annular groove 310. The ejector pin 810 rises against the force of the clamping spring 241 and lifts the ball 840. The ball 840 disengages from the limiting surface 211, so that the two ends of the branch channel 210 are connected. At this time, the needle valve 800 is in the open state. Start the oil pump 520, so that the oil in the oil cylinder 510 can be transported sequentially from the oil passage 410, the connecting cavity 230, and the branch channel 210 to the mounting cavity 280, thereby pushing the piston rod 620 and the cone head 621 to move towards the toothed plate 631. The cone head 621 can then push each toothed plate 631 outward, so that the user can easily complete the flaring operation of the pipe 1. After the oil pump 520 is shut off and depressurized, the oil in the mounting cavity 280 flows back into the cylinder 510. The return spring 640 then returns to its original position from pushing the piston rod 620 towards the bottom of the mounting cavity 280. Each toothed piece 631 loses the support of the cone head 621 and is retracted by the elastic ring 632. After the oil pump 520 restarts, the next flaring operation can be performed. At this time, only the flaring mechanism 600 is available. The ejector pin 910 is located at the lowest point B of the bottom of the annular groove 310, the needle valve 900 is closed, and the branch channel 220 is isolated.

[0040] When the user needs to use the sliding tightening function, first rotate the valve seat 200 180° around the central axis 400, so that the sliding tightening mechanism 700 replaces the original position of the flaring mechanism 600. At this time, the ejector pin 2 910 is located at the highest point A at the bottom of the annular groove 310. The ejector pin 2 910 overcomes the force of the clamping spring 251 and rises up and lifts the ball 2 940. The ball 2 940 is separated from the limiting surface 221, so that the two ends of the branch channel 220 are in a connected state, that is, the needle valve 2 900 is opened. After starting the oil pump 520, the oil in the oil cylinder 510 can be transported sequentially from the oil passage 410, the connecting cavity 230, and the branch channel 220 to the mounting cavity 290, so that the oil pushes the piston rod 2 720 and the slide 740 to move towards the fixed seat 730. The user can then easily complete the sliding tightening operation of the slide sleeve 2. After the oil pump 520 is shut off and depressurized, the oil in the mounting cavity 290 flows back to the oil cylinder 510, and the return spring 750 can then return to its original position from pushing the piston rod 720 towards the bottom of the mounting cavity 290. After the oil pump 520 is restarted, the next tightening operation can be performed.

[0041] During the rotation of the valve seat 200, ejector pin 1 810 and ejector pin 2 910 are always pressed against the bottom of the annular groove 310, while ball 262 is pressed against the support 300. When ejector pin 1 810 and ejector pin 2 910 are at the highest point A at the bottom of the annular groove 310, half of the ball 262 enters the limiting groove 320, that is, ball 262 is stuck between the valve seat 200 and the support 300, so as to increase the rotational resistance between the valve seat 200 and the support 300 and ensure the stable operation of the flaring mechanism 600 and the sliding mechanism 700.

[0042] In short, rotating the valve seat 200 allows switching between the flaring mechanism 600 and the sliding mechanism 700, making it more convenient to use and easier to carry.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the invention; those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A pipe flaring and tightening tool, characterized in that: It includes a housing (100), a valve seat (200), a support (300), a central shaft (400), a flaring mechanism (600), and a sliding mechanism (700); The valve seat (200) is rotatably mounted on the support (300), the support (300) is disposed inside the housing (100), the inner end of the central shaft (400) passes through the valve seat (200) and is connected to the support (300), the outer end of the central shaft (400) axially limits the valve seat (200), and the central shaft (400) has an oil passage (410) inside; The support (300) has an annular groove (310) on its end face facing the valve seat (200). The bottom of the annular groove (310) is inclined and forms a height difference. The bottom of the annular groove (310) has a highest point A and a lowest point B. The valve seat (200) has a first branch channel (210), a second branch channel (220), and a connecting cavity (230), and the connecting cavity (230) connects the first branch channel (210) and the second branch channel (220) to the oil passage (410); The valve seat (200) is provided with a needle valve one (800) capable of blocking the first branch channel (210) and a needle valve two (900) capable of blocking the second branch channel (220). The needle valve one (800) includes a slidingly disposed ejector pin one (810), and the needle valve two (900) includes a slidingly disposed ejector pin two (910). The lower ends of both ejector pin one (810) and ejector pin two (910) can abut against the annular groove (310). The second needle (910) can slide in the annular groove (310) as the valve seat (200) rotates. When the first needle (810) or the second needle (910) is at the highest point A, the first needle (810) controls the first needle valve (800) to open or the second needle (910) controls the second needle valve (900) to open. When the first needle (810) or the second needle (910) is at the lowest point B, the corresponding first needle valve (800) or second needle valve (900) closes automatically. The flaring mechanism (600) and the sliding mechanism (700) are both mounted on the valve seat (200). After the needle valve one (800) is opened, the oil in the branch channel one (210) controls the operation of the flaring mechanism (600). After the needle valve two (900) is opened, the oil in the branch channel two (220) controls the operation of the sliding mechanism (700).

2. The pipe flaring and tightening tool according to claim 1, characterized in that: The valve seat (200) is provided with a guide hole 1 (240) connecting the branch channel 1 (210) and a guide hole 2 (250) connecting the branch channel 2 (220). The ejector pin 1 (810) is slidably disposed in the guide hole 1 (240) and the ejector pin 2 (910) is slidably disposed in the guide hole 2 (250).

3. The pipe flaring and tightening tool according to claim 2, characterized in that: A clamping spring (241) is provided in the first guide hole (240), and the clamping spring (241) applies a force to the first ejector pin (810) in the direction of the annular groove (310). A clamping spring (251) is provided in the second guide hole (250), and the clamping spring (251) applies a force to the second ejector pin (910) in the direction of the annular groove (310). A sealing ring (811) is provided at the lower end of the first ejector pin (810), and a sealing ring (911) is provided at the lower end of the second ejector pin (910). A nut (242) is provided at the opening of the first guide hole (240) to limit the sealing ring (811), and a nut (252) is provided at the opening of the second guide hole (250) to limit the sealing ring (911).

4. The pipe flaring and tightening tool according to claim 1, characterized in that: The support (300) has a limiting groove (320), and the bottom of the valve seat (200) has a positioning groove (260) that can communicate with the limiting groove (320). A compression spring (261) and a ball (262) are arranged in sequence in the positioning groove (260). The compression spring (261) pushes the ball (262) to press against the support (300). The limiting groove (320) allows up to half of the ball (262) to enter. When the ball (262) enters the limiting groove (320), the first ejector pin (810) or the second ejector pin (910) is located at the highest point A of the bottom of the annular groove (310).

5. The pipe flaring and tightening tool according to claim 1, characterized in that: The central shaft (400) is the rotation center of the valve seat (200), and the outer end of the central shaft (400) has a flange (420). The valve seat (200) is provided with a limiting platform (270) that abuts against the flange (420).

6. The pipe flaring and tightening tool according to claim 5, characterized in that: A fixing groove (430) is provided on the outer side of the central shaft (400), and a fixing bolt (330) is provided on the support (300). The inner end of the fixing bolt (330) abuts against the bottom of the fixing groove (430).

7. The pipe flaring and tightening tool according to any one of claims 1-6, characterized in that: The first branch channel (210) has a limiting surface (211), and the second branch channel (220) has a limiting surface (221). The first needle valve (800) and the second needle valve (900) are symmetrically distributed on both sides of the central axis (400). The first needle valve (800) also includes a bolt (820), a preload spring (830), and a ball (840). The bolt (820) is connected to the valve seat (200). The inner end of the bolt (820) has an assembly groove (821) for placing the preload spring (830) and the ball (840). The preload spring (830) presses the ball (840) against the limiting surface (211). The branch channel 1 (210) is isolated, and the ejector pin 1 (810) can push the ball 1 (840) to move; the needle valve 2 (900) also includes bolt 2 (920), preload spring 2 (930), and ball 2 (940). Bolt 2 (920) is connected to the valve seat (200). The inner end of bolt 2 (920) has an assembly groove 2 (921) for placing preload spring 2 (930) and ball 2 (940). Preload spring 2 (930) presses ball 2 (940) against limiting surface 2 (221), thereby isolating the branch channel 2 (220). The ejector pin 2 (910) can push the ball 2 (940) to move.

8. The pipe flaring and tightening tool according to claim 7, characterized in that: The sidewall of the first assembly groove (821) is provided with a plurality of through holes (822) spaced apart, and the through holes (822) can connect to the first branch channel (210); the sidewall of the second assembly groove (921) is provided with a plurality of through holes (922) spaced apart, and the through holes (922) can connect to the second branch channel (220).

9. The pipe flaring and tightening tool according to any one of claims 1-6, characterized in that: The valve seat (200) has an installation cavity (280) that communicates with the branch channel (210). The flaring mechanism (600) includes a connector (610), a piston rod (620), a sleeve (630), and a return spring (640). The connector (610) is connected to the valve seat (200). The inner end of the piston rod (620) is slidably disposed in the installation cavity (280). The outer end of the piston rod (620) passes through the connector (610) and is connected to a cone. The head (621) and the sleeve (630) are connected to the connector (610). The sleeve (630) is provided with a plurality of teeth (631) in the inner circumferential direction. Each tooth (631) is located outside the cone head (621). The cone head (621) can push each tooth (631) to open outward. The return spring (640) is provided in the mounting cavity (280) and applies a force to the piston rod (620) pointing towards the bottom of the mounting cavity (280).

10. The pipe flaring and tightening tool according to any one of claims 1-6, characterized in that: The valve seat (200) has an installation cavity (290) that communicates with the branch channel (220). The sliding mechanism (700) includes a guide tube (710), a piston rod (220), a fixed seat (730), a slide (740), and a return spring (750). The inner end of the guide tube (710) is connected to the valve seat (200), and the guide tube (710) communicates with the installation cavity (290). The piston rod (220) is slidably disposed in the guide tube (710). A fixed seat (730) is disposed at the outer end of the conduit (710), and a sliding seat (740) is slidably disposed on the outer wall of the conduit (710). The sliding seat (740) is connected to the piston rod (720) via a pin (760). A guide groove (711) for the pin (760) is provided on the side wall of the conduit (710). The reset spring (750) is disposed inside the conduit (710) and applies a force to the piston rod (720) in a direction away from the fixed seat (730).

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