Main machine of electric pipe expander

Abstract

The utility model belongs to the technical field of pipe expanding tools, and particularly relates to an electric pipe expander main machine which comprises a pipe expanding device. The driving device is mounted on the pipe expanding device and used for driving the pipe expanding device to work; the pipe expanding device comprises a machine base, a pipe expanding device and a pipe expanding device, the transmission mechanism is rotationally arranged in the machine base, the rear end of the transmission mechanism extends into the box shell, and the transmission mechanism is connected with the driving device; the eccentric mechanism is installed in the machine base, and the rear end of the eccentric mechanism is arranged in the transmission mechanism; the rear end of the thread feeding mechanism is provided with a thread box shell, and the front end is connected with the eccentric mechanism; the eccentric mechanism at least comprises: an eccentric seat, the rear end of which protrudes to form a guide part, and the guide part is internally provided with a guide hole; the buffer assembly of the thread feeding mechanism is installed on the guide part, the front end of the screw of the thread feeding mechanism is inserted into the guide hole and connected with the buffer assembly through the pin shaft, the screw extends into the guide hole and is restrained by the guide hole, the coaxiality of the screw and the eccentric seat is high, the durability of the pipe expander is improved, and the service life of the pipe expander is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe expanding tools, in particular to a main engine of an electric pipe expander. Background Art

[0002] Eccentric expanders play a vital role in many industries such as refrigeration, petroleum, chemical industry, shipbuilding, and electric power. Especially in the installation and maintenance of air conditioners, expanders are indispensable tools. This tool is mainly used to expand the refrigerant copper tubes in order to connect tubes to tubes and tubes to containers.

[0003] For example, Chinese patent publication No. CN217142034U discloses an electric pipe expander, in which a boss at the end of the screw extends into the accommodating cavity, one end of the flat key extends into the keyway, and the other end extends into the accommodating cavity of the propulsion shaft and extends into the strip groove of the boss. There are some shortcomings in that the disc spring assembly is installed between the front end of the boss and the bottom wall of the accommodating cavity, so that the contact area between the side wall of the boss at the end of the screw and the side wall of the accommodating cavity is small, the boss of the screw is not subjected to sufficient force, resulting in the screw shaking, thereby resulting in low coaxiality between the screw and the propulsion shaft, and low torque transmission efficiency between the nut and the screw, which affects the operation of the pipe expander. Utility Model Content

[0004] The utility model aims to provide an electric pipe expander main unit, in which the front end of a screw is inserted into a guide hole and connected to a buffer assembly through a pin shaft. The screw is constrained by the guide hole, so that the screw and the eccentric seat have high coaxiality, thereby improving the problem that the low coaxiality between the screw and the propulsion shaft affects the torque transmission between the nut and the screw.

[0005] The purpose of the utility model is achieved in this way:

[0006] An electric pipe expander main unit, used for expanding the end of a pipe fitting in cooperation with a chuck, comprises:

[0007] Pipe expansion device;

[0008] A driving device, which is installed on the pipe expanding device and is used to drive the pipe expanding device to work;

[0009] Wherein, the pipe expansion device comprises:

[0010] A machine base, the rear end of which is provided with a box shell;

[0011] A transmission mechanism, which is rotatably arranged in the base and has a rear end extending into the box shell, and the transmission mechanism is connected to the driving device;

[0012] An eccentric mechanism, which is installed in the machine base and has a rear end placed in the transmission mechanism;

[0013] A threaded feeding mechanism is installed in the box shell, with a rear end threaded on the box shell and a front end connected to the eccentric mechanism;

[0014] The eccentric mechanism at least comprises:

[0015] The eccentric seat has a guide portion protruding from its rear end, and a guide hole is provided in the guide portion;

[0016] The buffer component of the thread feeding mechanism is installed on the guide part, and the front end of the screw of the thread feeding mechanism is inserted into the guide hole and connected with the buffer component through a pin shaft.

[0017] Preferably, the guide portion is provided with an avoidance hole penetrating through the side wall of the guide portion, and the pin shaft is movably arranged in the avoidance hole;

[0018] The buffer assembly comprises:

[0019] An elastic member, which is sleeved on the guide portion, and the front end of the elastic member movably abuts against the rear end surface of the eccentric seat;

[0020] A support sleeve, which is sleeved on the guide portion and connected to the screw rod through the pin;

[0021] When the screw of the threaded feeding mechanism moves forward, the support sleeve movably abuts against the elastic member to push the eccentric mechanism forward.

[0022] Preferably, the supporting sleeve is a metal sleeve.

[0023] Preferably, the elastic member is a tendon member, a spring or a disc spring.

[0024] Preferably, the thread feeding mechanism comprises at least:

[0025] A nut is clamped on the rear end of the housing.

[0026] A screw, threadedly connected to the nut;

[0027] A mounting hole is provided at the rear end of the box shell, a limiting groove is provided in the mounting hole along the axis, a limiting protrusion is provided on the side wall of the nut along the axis, and a boss is formed at the front end of the nut; when the rear end of the boss abuts against the edge of the mounting hole and the limiting protrusion is engaged in the limiting groove, the nut and the box shell are engaged.

[0028] Preferably, a connecting hole 1 penetrating the supporting sleeve is opened on the side wall of the supporting sleeve, and a connecting hole 2 is opened on the side wall of the screw rod. The pin shaft is inserted into the connecting hole 2, and the pin shaft passes through the avoidance hole and the connecting hole 1 to realize the connection between the screw rod and the supporting sleeve.

[0029] Preferably, a bearing 1 is sleeved on the front end of the eccentric seat, a slip ring is slidably arranged between the center hole of the bearing 1 and the outer side wall of the eccentric seat, and the outer side of the bearing 1 abuts against the machine base.

[0030] Preferably, a positioning hole is provided at the front end of the eccentric seat, and a pipe expansion cone head is rotatably connected in the positioning hole via a second bearing, and an angle is formed between the axis of the positioning hole and the axis of the eccentric seat.

[0031] Preferably, when the screw rod extends into the guide hole, the eccentric seat and the screw rod axis coincide with each other.

[0032] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0033] The utility model inserts the front end of the screw of the threaded feeding mechanism into the guide hole and connects the buffer component through the pin shaft, the screw pushes the buffer component to move forward, and the buffer component pushes the eccentric mechanism to move forward to perform the pipe expansion operation; the front end of the screw extends into the guide hole and is constrained by the guide hole, the contact surface between the screw and the guide hole is large, the coaxiality of the screw and the eccentric seat is high, the shaking of the screw in the eccentric seat is reduced, the threaded connection between the screw and the box shell is more stable, the threaded torque transmission efficiency between the screw and the box shell is higher, and the durability and service life of the pipe expander are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a cross-sectional view of the utility model.

[0035] Figure 2 It is a structural schematic diagram of the worm gear of the utility model.

[0036] Figure 3 It is a structural schematic diagram of the eccentric seat of the utility model.

[0037] Figure 4 It is a schematic diagram of the overall structure of the utility model.

[0038] Figure 5 It is a structural schematic diagram of the transmission mechanism of the utility model.

[0039] Figure 6 It is a structural schematic diagram of the nut and the box shell of the utility model.

[0040] Figure numerals: 1. tube expansion device; 11. machine base; 12. casing; 121. mounting hole; 122. limiting groove; 2. driving device; 3. transmission mechanism; 30. worm wheel; 31. transmission groove; 32. worm; 4. eccentric mechanism; 5. thread feeding mechanism; 51. screw; 511. connecting hole 2; 52. nut; 521. limiting protrusion; 522. boss; 6. eccentric seat; 61. guide part; 611. avoidance hole; 62. guide hole; 64. bearing 1; 65. slip ring; 66. positioning hole; 67. bearing 2; 68. tube expansion cone head; 7. buffer assembly; 71. elastic member; 72. support sleeve; 721. connecting hole 1; 8. pin shaft. DETAILED DESCRIPTION

[0041] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0042] Combination Figures 1 to 3 , an electric expander host, used for expanding the end of a pipe fitting in cooperation with a chuck, comprising: a pipe expanding device 1; a driving device 2, which is installed on the pipe expanding device 1 and is used to drive the pipe expanding device 1 to work; wherein the pipe expanding device 1 comprises: a machine base 11, a box shell 12 is installed at its rear end by screws; a transmission mechanism 3, which is rotatably arranged in the machine base 11, and the rear end extends into the box shell 12, and the transmission mechanism 3 is connected to the driving device 2; an eccentric mechanism 4, which is installed in the machine base 11, and the rear end of the eccentric mechanism 4 is placed in the transmission mechanism 3; a threaded feeding mechanism 5, which is installed in the box shell 12, and the rear end of the threaded feeding mechanism 5 is threaded into the box shell 12, and the front end of the threaded feeding mechanism 5 is connected to the eccentric mechanism 4; the eccentric mechanism 4 at least has: an eccentric seat 6, a guide portion 61 protrudes at its rear end, and a guide hole 62 is opened in the guide portion 61; a buffer assembly 7 of the threaded feeding mechanism 5 is installed on the guide portion 61, and the front end of the screw 51 of the threaded feeding mechanism 5 is inserted into the guide hole 62 and connected to the buffer assembly 7 through a pin 8.

[0043] like Figure 5 As shown, the transmission mechanism 3 includes a worm wheel 30 and a worm 32 that mesh with each other. The worm 32 is driven by a motor, and the motor is powered by a lithium battery. The rear end of the eccentric mechanism 4 is placed in the cavity of the worm wheel 30, and a transmission groove 31 is opened in the worm wheel 30 along the axis.

[0044] like Figure 4 The driving device 2 includes: a motor for driving the worm 32 to rotate and a battery for supplying power to the motor, and a shell is arranged outside the motor and the battery.

[0045] The transmission mechanism 3 drives the eccentric mechanism 4 to rotate, and the eccentric mechanism 4 drives the screw 51 to rotate through the pin shaft 8. The screw 51 is threadedly connected to the box shell 12 and rotates forward. The forward movement of the screw 51 causes the buffer assembly 7 to push the eccentric mechanism 4 forward to cooperate with the chuck to achieve pipe expansion of the pipe fitting.

[0046] The front end of the screw 51 is inserted into the guide hole 62, and the contact force area between the screw 51 and the guide hole 62 is large. The screw 51 is constrained by the guide hole 62, and the shaking of the screw 51 is reduced when it rotates forward in the box shell 12, so that the coaxiality of the screw 51 and the eccentric seat 6 is high, and the torque transmission efficiency between the screw 51 and the nut 52 described below is high, which reduces the load of the motor and improves the use efficiency of the pipe expander.

[0047] like Figure 1 As shown, the guide portion 61 is provided with an avoidance hole 611 which passes through the side wall of the guide portion 61, and the pin shaft 8 is movably inserted into the avoidance hole 611; the buffer assembly 7 includes: an elastic member 71, which is sleeved on the guide portion 61, and the front end of the elastic member 71 movably abuts against the rear end surface of the eccentric seat 6; a support sleeve 72, which is sleeved on the guide portion 61 and connected to the screw 51 through the pin shaft 8; when the screw 51 of the threaded feeding mechanism 5 moves forward, the support sleeve 72 movably abuts against the elastic member 71, so that the front end of the elastic member 71 abuts against the rear end surface of the eccentric seat 6, thereby pushing the eccentric mechanism 4 forward.

[0048] The support sleeve 72 is a metal sleeve, such as an aluminum sleeve, a steel sleeve or an iron sleeve.

[0049] The elastic member 71 is a tendon member, a spring or a disc spring. The elastic member 71 can prevent the pin shaft 8 from contacting the front end of the avoidance hole 611 of the guide portion 61 when the screw rod 51 pushes the pin shaft 8 forward to push the support sleeve 72 forward. The pin shaft 8 will not directly apply thrust to the front end of the avoidance hole 611 of the eccentric seat 6, thereby preventing the front end of the inner wall of the avoidance hole 611 of the eccentric seat 6 from being worn and deformed due to the extrusion of the pin shaft 8, thereby extending the service life of the eccentric seat 6.

[0050] Combination Figure 1 and Figure 6 The threaded feeding mechanism 5 at least includes: a nut 52, which is clamped at the rear end of the box shell 12, and a screw rod 51, which is threadedly connected to the nut 52; a mounting hole 121 is opened at the rear end of the box shell 12, and a limiting groove 122 is provided along the axis in the mounting hole 121, a limiting protrusion 521 is provided on the side wall of the nut 52 along the axis, and a boss 522 is formed at the front end of the nut 52; when the rear end of the boss 522 abuts against the edge of the mounting hole 121 and the limiting protrusion 521 is clamped in the limiting groove 122, the clamping connection between the nut 52 and the box shell 12 is realized; the rear end of the boss 522 abuts against the edge of the mounting hole 121 to prevent the nut 52 from moving backward in the mounting hole 121 and disengaging, and at the same time, there is friction between the nut 52 and the mounting hole 121 to prevent the nut 52 from moving forward in the mounting hole 121 and disengaging when the screw rod 51 rotates and moves backward in the nut 52.

[0051] like Figure 1A connecting hole 721 penetrating the supporting sleeve 72 is provided on the side wall of the supporting sleeve 72, a connecting hole 511 is provided on the side wall of the screw rod 51, the pin shaft 8 is passed through the connecting hole 511, and the end of the pin shaft 8 passes through the avoidance hole 611 and the connecting hole 721 and is placed in the transmission groove 31 of the worm gear 30, so as to realize the connection between the screw rod 51 and the supporting sleeve 72. When the worm gear 30 rotates to make the pin shaft 8 rotate, the pin shaft 8 drives the supporting sleeve 72, the screw rod 51 and the eccentric seat 6 to rotate.

[0052] like Figure 1 A bearing 64 is sleeved on the front end of the eccentric seat 6 , a slip ring 65 is slidably arranged between the middle hole of the bearing 64 and the outer side wall of the eccentric seat 6 , and the outer side of the bearing 64 abuts against the machine base 11 .

[0053] A positioning hole 66 is provided at the front end of the eccentric seat 6 , and a pipe expansion cone head 68 is rotatably connected to the positioning hole 66 via a bearing 2 67 , and an angle is formed between the axis of the positioning hole 66 and the axis of the eccentric seat 6 .

[0054] When the screw rod 51 extends into the guide hole 62 , the axes of the eccentric seat 6 and the screw rod 51 coincide with each other, so that the screw rod 51 moves more stably in the guide hole 62 .

[0055] The specific structure of the chuck can be referred to the description in Chinese Patent Publication No. CN112317627A, which will not be repeated here.

[0056] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An electric pipe expander main unit, used to cooperate with a chuck to expand the end of a pipe fitting, characterized in that: include: Pipe expansion device (1); A driving device (2) installed on the pipe expanding device (1) and used to drive the pipe expanding device (1) to work; Wherein, the pipe expansion device (1) comprises: A machine base (11) having a box shell (12) mounted at its rear end; A transmission mechanism (3) is rotatably disposed in the machine base (11) and has a rear end extending into the housing (12). The transmission mechanism (3) is connected to the drive device (2); An eccentric mechanism (4) is installed in the machine base (11), and a rear end thereof is placed in the transmission mechanism (3); A threaded feeding mechanism (5) is installed in the box shell (12), with a rear end threaded on the box shell (12) and a front end connected to the eccentric mechanism (4); The eccentric mechanism (4) at least comprises: The eccentric seat (6) has a guide portion (61) protruding from the rear end thereof, and a guide hole (62) is formed in the guide portion (61); The buffer assembly (7) of the threaded feeding mechanism (5) is mounted on the guide portion (61), and the front end of the screw rod (51) of the threaded feeding mechanism (5) is inserted into the guide hole (62) and connected to the buffer assembly (7) via a pin shaft (8).

2. The electric tube expander main unit according to claim 1, characterized in that: The guide portion (61) is provided with an avoidance hole (611) penetrating the side wall of the guide portion (61), and the pin shaft (8) is movably inserted into the avoidance hole (611); The buffer component (7) comprises: An elastic member (71) is sleeved on the guide portion (61), and the front end of the elastic member (71) movably abuts against the rear end surface of the eccentric seat (6); A support sleeve (72) is sleeved on the guide portion (61) and connected to the screw rod (51) via the pin shaft (8); When the screw rod (51) of the threaded feeding mechanism (5) moves forward, the support sleeve (72) movably contacts the elastic member (71) to push the eccentric mechanism (4) forward.

3. The electric pipe expander main unit according to claim 2, characterized in that: The support sleeve (72) is a metal sleeve.

4. The electric pipe expander main unit according to claim 2, characterized in that: The elastic member (71) is a tendon member, a spring or a disc spring.

5. An electric pipe expander main unit according to any one of claims 1 to 4, characterized in that: The thread feeding mechanism (5) at least comprises: A nut (52) is clamped on the rear end of the housing (12). A screw (51) threadedly connected to the nut (52); The box shell (12) is provided with a mounting hole (121) at the rear end, a limiting groove (122) is provided inside the mounting hole (121) along the axis, a limiting protrusion (521) is provided on the side wall of the nut (52) along the axis, and a boss (522) is formed at the front end of the nut (52); when the rear end of the boss (522) abuts against the edge of the mounting hole (121) and the limiting protrusion (521) is engaged in the limiting groove (122), the nut (52) and the box shell (12) are engaged with each other.

6. The electric pipe expander main unit according to claim 2, characterized in that: A first connection hole (721) penetrating the support sleeve (72) is provided on the side wall of the support sleeve (72), a second connection hole (511) is provided on the side wall of the screw rod (51), the pin shaft (8) is inserted into the second connection hole (511), and the pin shaft (8) passes through the avoidance hole (611) and the first connection hole (721), thereby realizing the connection between the screw rod (51) and the support sleeve (72).

7. The electric pipe expander main unit according to claim 1, characterized in that: A bearing 1 (64) is sleeved on the front end of the eccentric seat (6), a slip ring (65) is slidably arranged between the center hole of the bearing 1 (64) and the outer side wall of the eccentric seat (6), and the outer side of the bearing 1 (64) abuts against the machine base (11).

8. The electric pipe expander main unit according to claim 1, characterized in that: The front end of the eccentric seat (6) is provided with a positioning hole (66), and a pipe expansion cone head (68) is rotatably connected to the positioning hole (66) via a second bearing (67), and an angle is formed between the axis of the positioning hole (66) and the axis of the eccentric seat (6).

9. The electric pipe expander main unit according to claim 1, characterized in that: When the screw rod (51) extends into the guide hole (62), the axes of the eccentric seat (6) and the screw rod (51) coincide with each other.

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