A cylindrical bar positioning and clamping device for clamping copper tubes of heat exchangers

Abstract

The application discloses a cylindrical bar positioning and clamping device which can be used for clamping copper tubes of heat exchangers, comprising a rack, a hollow tube sleeve assembly arranged on the rack, a pipe inserting port provided at the front end of the hollow tube sleeve assembly and capable of allowing a pipe to be inserted into the pipe inserting port, a pipe clamping assembly arranged on the hollow tube sleeve assembly and capable of clamping the pipe after the pipe is inserted into the pipe inserting port, a limiting piece arranged in the hollow tube sleeve assembly and capable of abutting against the inserting end of the pipe to limit the maximum inserting depth of the pipe, and a depth adjusting device connected with the limiting piece and capable of driving the limiting piece to move along the axial direction of the hollow tube sleeve assembly. The position of the limiting piece can be adjusted according to requirements, and the maximum inserting depth of the pipe can be adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger production, and particularly relates to a cylindrical bar positioning and clamping device for clamping copper pipes of a heat exchanger. BACKGROUND

[0002] As a compact heat exchanger, the tube-fin heat exchanger is widely used in the refrigeration industry. The main raw materials for producing the tube-fin heat exchanger are copper pipes and heat dissipation fins. During the production of the heat exchanger, the copper pipes need to be processed, such as pipe expansion, bending, cutting or punching. During the processing of the copper pipes, the end portions of the copper pipes need to be clamped and fixed.

[0003] In order to clamp and fix the end portions of the copper pipes, a copper pipe end head clamping device is disclosed in the patent with the publication number CN 201609740 U. The clamping device uses a servo motor to drive a lead screw, and then uses the lead screw nut to push a sliding plate to slide forward and backward, so that the sliding plate sleeve drives the pipe clamp head to open or close, so that the pipe clamp head can loosen or clamp the copper pipe. However, such a clamping device also has the following problems: first, after the pipe clamp head clamps the copper pipe, the insertion depth of the copper pipe is fixed and cannot be adjusted according to needs; second, after the pipe processing is completed, if automatic unloading is to be realized, a corresponding power device needs to be used outside the clamping device to pull out the copper pipe outward, which requires high accuracy of the direction of the pulling-out power, and the overall structure is relatively complex. When the pulling-out direction deviates from the axis of the clamping device, the copper pipe may be scratched during the process of pulling out the copper pipe. SUMMARY

[0004] In view of this, the purpose of the present application is to provide a cylindrical bar positioning and clamping device for clamping copper pipes of a heat exchanger, which facilitates adjustment of the insertion depth of the copper pipes.

[0005] The technical scheme adopted by the present application to solve the technical problems is as follows:

[0006] A cylindrical bar positioning and clamping device for clamping copper pipes of a heat exchanger, comprising: a rack, a hollow pipe sleeve assembly arranged on the rack, the front end of the hollow pipe sleeve assembly having a pipe insertion port for inserting a pipe into the inside of the pipe insertion port, a pipe clamp assembly arranged on the hollow pipe sleeve assembly and capable of clamping the pipe after the pipe is inserted into the inside of the pipe insertion port, a limiting piece arranged in the hollow pipe sleeve assembly and capable of abutting against the insertion end of the pipe to limit the maximum insertion depth of the pipe, and a depth adjusting device connected to the limiting piece and capable of driving the limiting piece to move along the axial direction of the hollow pipe sleeve assembly.

[0007] In a preferred scheme of the present application, the depth adjusting device comprises a screwing rod rotatable on the hollow sleeve assembly about the axis of the hollow sleeve assembly, an axial guide structure is arranged between the hollow sleeve assembly and the limiting member, and the screwing rod is threadedly connected with the limiting member so that the rotation of the screwing rod can drive the limiting member to move along the axis of the hollow sleeve assembly.

[0008] In a preferred scheme of the present application, the rear end of the screwing rod is exposed outside the hollow sleeve assembly, and the exposed part of the screwing rod has a prismatic segment that can be driven to rotate by an external tool.

[0009] In a preferred scheme of the present application, the axial guide structure comprises a guide sleeve arranged in the hollow sleeve assembly, an axial key groove is arranged on the inner side wall of the guide sleeve, and the limiting member penetrates through the guide sleeve and is provided with a sliding key that is in sliding fit with the key groove.

[0010] In a preferred scheme of the present application, an external thread is arranged on the outer side wall of the screwing rod, and an internal thread is arranged on the limiting member and in fit with the external thread.

[0011] In a preferred scheme of the present application, the hollow sleeve assembly is rotatably mounted on the rack, and the hollow sleeve assembly rotates with the pipe clamp assembly, the screwing rod and the limiting member, the screwing rod and the limiting member are both hollow and their inner holes are in communication, an unloading piston axially movable in the hollow sleeve assembly is arranged in the hollow sleeve assembly, a rotary joint is connected to the rear end of the screwing rod, and an air inlet hole is arranged on the rotary joint, through which high-pressure gas is introduced to drive the unloading piston to move forward to eject the pipe from the hollow sleeve assembly.

[0012] In a preferred scheme of the present application, the unloading piston is provided with a vent hole that can guide the space in front of the unloading piston to the space behind the unloading piston.

[0013] In a preferred scheme of the present application, the front part of the unloading piston is provided with a tube core support that can be inserted into the inside of the pipe, and the tube core support has a round pie-shaped support part that is in fit with the inner side wall of the pipe.

[0014] In a preferred scheme of the present application, the rotary joint comprises a joint sleeve, a connecting member rotatably mounted in the joint sleeve, the air inlet hole is arranged on the outer side wall of the joint sleeve, the outer side wall of the connecting member is provided with a circumferential groove in communication with the air inlet hole, the connecting member is provided with a blind hole with an opening ahead, and the connecting member is further provided with a plurality of gas guide holes that guide the blind hole and the circumferential groove.

[0015] In a preferred scheme of the present application, a rotary sealing ring is arranged between the connecting member and the joint sleeve.

[0016] In a preferred scheme of the present application, the hollow tube sleeve assembly is further provided with a transmission structure capable of being driven by an external power device to rotate around its own axis.

[0017] In a preferred scheme of the present application, the transmission structure comprises a belt groove arranged on the outer sidewall of the hollow tube sleeve assembly.

[0018] The present application has the following advantages:

[0019] Firstly, the cylindrical bar positioning and clamping device for clamping copper tubes of heat exchangers can adjust the position of the limiting member according to the need, thereby adjusting the maximum insertion depth of the pipe fitting.

[0020] Secondly, the cylindrical bar positioning and clamping device for clamping copper tubes of heat exchangers can unload the pipe fitting by connecting the air source to the rotary joint, and when it is necessary to unload the pipe fitting, high-pressure gas is introduced through the air inlet hole of the rotary joint. The high-pressure gas entering the interior of the hollow tube sleeve assembly drives the unloading piston to move forward, thereby ejecting the pipe fitting in the hollow tube sleeve assembly and achieving automatic unloading.

[0021] Thirdly, during the process of loading the pipe fitting, the space behind the unloading piston is a relatively closed space, and the pipe fitting pushes the unloading piston to move backward until the position of the limiting member. During this process, the gas behind the unloading piston can be discharged from the air vent hole of the unloading piston, thereby avoiding the situation that the pipe fitting cannot be loaded in place due to the excessively high air pressure behind the unloading piston. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the present application when loading the pipe fitting;

[0023] Figure 2 is a structural schematic view of the present application when the unloading piston ejects the pipe fitting;

[0024] Figure 3 is an exploded view of the present application;

[0025] Figure 4 is a depth adjustment structure principle view of the limiting member;

[0026] Figure 5 is a structural schematic view of the rear end of the screw rod;

[0027] Figure 6 is a structural schematic view of the rotary joint. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0029] It should be noted that all directional indications in the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0030] Reference Figures 1 to 6 The present invention proposes a cylindrical bar positioning and clamping device that can be used to clamp the copper tube of the heat exchanger, comprising: a frame 1, a hollow pipe sleeve assembly 2 arranged on the frame 1, the front end of the hollow pipe sleeve assembly 2 having an insertion port for inserting the pipe fitting 3 therein, the hollow pipe sleeve assembly 2 is provided with a pipe clamp assembly 4 that can clamp the pipe fitting 3 after the pipe fitting 3 is inserted therein, a limiter 5 is provided in the hollow pipe sleeve assembly 2 that can abut against the insertion end of the pipe fitting 3 to limit the maximum insertion depth of the pipe fitting 3, and the limiter 5 is connected to a depth adjustment device that can drive it to move along the axial direction of the hollow pipe sleeve assembly 2.

[0031] A bearing 9 is provided between the frame 1 and the hollow tube sleeve assembly 2, allowing the hollow tube sleeve assembly 2 to rotate about its axis on the frame 1. A transmission structure is also provided on the hollow tube sleeve assembly 2, which can be driven by an external power device to rotate about its axis. This transmission structure can be a belt groove 231 provided on the outer wall of the hollow tube sleeve assembly 2, or a device such as a gear or sprocket. When the hollow tube sleeve assembly 2 rotates, it rotates with the pipe clamp assembly 4, the screw rod 61, the stopper 5, and the pipe fitting 3, facilitating expansion, cutting, or drilling of the pipe fitting 3.

[0032] In a preferred embodiment of the present invention, the depth adjustment device includes a screw rod 61 that can rotate around the axis of the hollow tube sleeve assembly 2 on the hollow tube sleeve assembly 2, and an axial guide structure is provided between the hollow tube sleeve assembly 2 and the limit member 5. The screw rod 61 is threadedly connected to the limit member 5 so that when the screw rod 61 rotates, it can drive the limit member 5 to move axially along the hollow tube sleeve assembly 2.

[0033] Specifically, the rear end of the screw rod 61 is exposed outside the hollow tube sleeve assembly 2. The exposed portion of the screw rod 61 has a prismatic segment 611 that can be driven to rotate by an external tool. The prismatic segment 611 is in the shape of a triangular prism, a quadrangular prism, or a hexagonal prism. The axial guide structure includes a guide sleeve 62 disposed within the hollow tube sleeve assembly 2. The inner sidewall of the guide sleeve 62 is provided with an axial keyway 621. The limiter 5 passes through the guide sleeve 62 and is provided with a sliding key 51 that slidably engages with the keyway 621. The screw rod 61 and the limiter 5 are both hollow tubular, and their inner holes are interconnected. The outer sidewall of the screw rod 61 is provided with an external thread, and the limiter 5 is provided with an internal thread that mates with the external thread. The method for adjusting the maximum insertion depth of the pipe fitting 3 is as follows: when the machine is stopped, use a wrench to clamp the prismatic segment 611 and drive the screw rod 61 to rotate, thereby driving the limit member 5 to move axially in the hollow pipe sleeve assembly 2. After the adjustment is completed, the limit member 5 and the hollow pipe sleeve assembly 2 remain relatively fixed under the self-locking action of the threaded structure.

[0034] In the above-mentioned solution, manual adjustment is adopted to adjust the position of the limit member 5. In some preferred solutions of the present invention, a belt groove 231 or a gear or other structure can also be provided on the screw rod 61 to automatically drive the screw rod 61 to rotate through an external power device.

[0035] Furthermore, a discharge piston 7 that can move axially therein is provided in the hollow pipe sleeve assembly 2, and the rear end of the screw rod 61 is connected to a rotary joint 8, and an air inlet hole 801 is provided on the rotary joint 8. The air vent can be connected to an external high-pressure gas source. When the pipe fitting 3 needs to be removed, the valve of the high-pressure gas source can be opened, and high-pressure gas can be introduced through the air inlet hole 801. After these high-pressure gases enter the hollow pipe sleeve assembly 2, they will drive the discharge piston 7 to move forward, thereby pushing out the pipe fitting 3 in the hollow pipe sleeve assembly 2.

[0036] The front of the unloading piston 7 is provided with a tube core support 71 that can be inserted into the interior of the tube fitting 3. The tube core support 71 has a round pancake-shaped support portion 711 that fits with the inner wall of the tube fitting 3. With such a design, support can be provided to the tube fitting 3 inside the tube fitting 3, and deformation of the tube fitting 3 can be minimized during the processing of the tube fitting 3.

[0037] Furthermore, the discharge piston 7 is provided with a vent hole 701 that connects the space in front of it to the space behind it. When the pipe 3 is installed, the valve of the high-pressure gas source is closed, and the space behind the discharge piston 7 is relatively closed. During the installation process, the pipe 3 pushes the discharge piston 7 backward until it reaches the position of the stopper 5. During this process, the gas behind the discharge piston 7 can be discharged through the vent hole 701, thus preventing the pipe 3 from being installed due to excessive air pressure behind the discharge piston 7.

[0038] Referring to Figure 6 , the rotary joint 8 comprises a joint sleeve 81, a connecting piece 82 rotatably mounted in the joint sleeve 81, an air inlet hole 801 arranged on the outer side wall of the joint sleeve 81, a circumferential groove 802 arranged on the outer side wall of the connecting piece 82 and communicated with the air inlet hole 801, a blind hole 803 arranged on the connecting piece 82 and having an opening in advance, and a plurality of air guide holes 804 arranged on the connecting piece 82 and communicated with the blind hole 803 and the circumferential groove 802. In order to realize sealing, a rotary sealing ring 83 is arranged between the connecting piece 82 and the joint sleeve 81.

[0039] In order to facilitate production and assembly, the hollow pipe sleeve assembly 2 adopts a structure combined by a plurality of different components, referring to Figure 2 and Figure 3 In a preferred scheme of the present application, the hollow pipe sleeve assembly 2 comprises, from front to back, a pipe sleeve head 21, a pipe sleeve body 22, a belt pulley 23, and a screw rod mounting sleeve assembly 24, and the pipe sleeve body 22 movably has an axially movable traction pipe 25 arranged therein.

[0040] The pipe clamp assembly 4 can adopt the following structure, such as a collapsible tubular clamp head, a plurality of axial collapsible grooves arranged at one end of the tubular clamp head, a spring piece formed between every two collapsible grooves, a pushing inclined surface arranged on the inner side wall of the pipe sleeve head, and a bearing pushing inclined surface arranged on the outer side wall of the spring piece. When the tubular clamp head is axially moved by the power device, the pushing inclined surface is pressed on the bearing pushing inclined surface, so that the spring piece is collapsed inward to clamp the pipe 3 therein. In addition, the pipe clamp assembly 4 can adopt a structure similar to the three-jaw chuck on a lathe.

[0041] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the inventive concept of the present application, or direct or indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A cylindrical bar positioning and clamping device that can be used to clamp the copper tube of a heat exchanger, characterized in that: include: A frame (1), a hollow pipe sleeve assembly (2) rotatably mounted on the frame (1), a bearing (9) being provided between the frame (1) and the hollow pipe sleeve assembly (2), a front end of the hollow pipe sleeve assembly (2) having an insertion port for inserting a pipe fitting (3) therein, a pipe clamp assembly (4) being provided on the hollow pipe sleeve assembly (2) for clamping the pipe fitting (3) therein after the pipe fitting (3) is inserted therein, a position limiting member (5) being provided in the hollow pipe sleeve assembly (2) for abutting against the insertion end of the pipe fitting (3) to limit the maximum insertion depth of the pipe fitting (3), and the position limiting member (5) being connected to a depth adjusting device capable of driving the position limiting member (5) to move axially along the hollow pipe sleeve assembly (2); The depth adjustment device comprises a screw rod (61) that can rotate on the hollow tube sleeve assembly (2) around the axis of the hollow tube sleeve assembly (2); an axial guide structure is provided between the hollow tube sleeve assembly (2) and the limiting member (5); the screw rod (61) is threadedly connected to the limiting member (5) so that when the screw rod (61) rotates, the limiting member (5) can be driven to move along the axial direction of the hollow tube sleeve assembly (2); When the hollow pipe sleeve assembly (2) rotates, the pipe clamp assembly (4), the screw rod (61) and the limiter (5) rotate together. The screw rod (61) and the limiter (5) are both hollow tubular and their inner holes are interconnected. A discharge piston (7) is provided in the hollow pipe sleeve assembly (2) and can move axially therein. The rear end of the screw rod (61) is connected to a rotary joint (8). An air inlet (801) is provided on the rotary joint (8). When high-pressure gas is introduced through the air inlet (801), the discharge piston (7) is driven to move forward to eject the pipe (3) in the hollow pipe sleeve assembly (2).

2. A cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: The rear end of the screw rod (61) is exposed outside the hollow pipe sleeve assembly (2), and the exposed portion of the screw rod (61) has a prismatic section (611) that can be driven to rotate by an external tool.

3. The cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: The axial guide structure comprises a guide sleeve (62) arranged in the hollow pipe sleeve assembly (2), an axial keyway (621) is provided on the inner side wall of the guide sleeve (62), the limit member (5) passes through the guide sleeve (62), and a sliding key (51) is provided on the limit member (5) and is slidably engaged with the keyway (621).

4. The cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: An external thread is provided on the outer side wall of the screw rod (61), and an internal thread matching the external thread is provided on the limiting member (5).

5. The cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: The discharge piston (7) is provided with an air leakage hole (701) capable of communicating the space in front of the discharge piston with the space in the rear of the discharge piston.

6. The cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: The front portion of the discharge piston (7) is provided with a tube core support (71) capable of being inserted into the interior of the tube (3). The tube core support (71) has a circular pancake-shaped support portion (711) that fits the inner wall of the tube (3).

7. The cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: The rotary joint (8) comprises a joint sleeve (81), a connecting piece (82) rotatably mounted in the joint sleeve (81), the air inlet (801) being arranged on the outer side wall of the joint sleeve (81), a circumferential groove (802) communicating with the air inlet (801) being arranged on the outer side wall of the connecting piece (82), a blind hole (803) with an advanced opening being arranged on the connecting piece (82), and a plurality of air guide holes (804) communicating with the blind hole (803) and the circumferential groove (802) being arranged on the connecting piece (82).

8. The cylindrical bar positioning and clamping device for clamping a heat exchanger copper tube according to claim 1, characterized in that: The hollow pipe sleeve assembly (2) is also provided with a transmission structure that can be driven by an external power device to rotate around its own axis.

Images