Pipe clamp and machine tool

Abstract

The utility model discloses a tubular product clamp and machine tool, wherein the tubular product clamp comprises a sleeve body, an elastic chuck and a fixing piece, the sleeve body and the elastic chuck are hollow, the elastic chuck is sleeved in the sleeve body, the interior of the elastic chuck is used for clamping a tubular product, and the fixing piece is used for fixing the tubular product. The fixing piece is in threaded connection with one end of the sleeve body and abuts against the elastic chuck so that the periphery of the elastic chuck can be bent towards the inner side to press the pipe, and the driving device is connected with the tightening mechanism and used for driving the tightening mechanism to be connected with the fixing piece. The tightening mechanism is used for being connected with the fixing piece so as to drive the fixing piece to be rotationally fixed to the sleeve body. The automatic pipe tightening device can effectively avoid deformation and damage of pipes caused by uneven stress, can achieve automatic tightening through the tightening mechanism, and is simple in structure and convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe clamps, and more specifically, to a pipe clamp and a machine tool. Background Art

[0002] Existing CNC lathes can easily clamp pipes through a three-jaw chuck, which clamps and positions the workpiece through the radial movement of three jaws. These jaws can rotate around the central axis to achieve clamping of workpieces of different diameters. The basic structure of a three-jaw chuck includes a chuck body, a movable jaw, and a jaw drive mechanism. The chuck body usually has three evenly distributed jaws that can contact the surface of the workpiece to achieve clamping. The clamping process of a three-jaw chuck involves mechanical components such as high-pressure gas, a pull rod, a wedge, and a connecting rod. The high-pressure gas enters the cylinder to push the pull rod, which drives the jaws to move radially through the wedge and connecting rod structure to achieve clamping of the workpiece. The positioning process of a three-jaw chuck involves the contraction and rotation of the jaws.

[0003] However, after a period of use, the chuck may deviate from the center of the lathe spindle due to wear, affecting the accuracy of the workpiece. In addition, when processing PVC-U drainage pipes, since most of the products are hollow pipes, in terms of product appearance, there are generally surface indentations or serious product deformation. Affected by the manufacturing error, the indentations are deep or shallow, which seriously affects the product appearance. In addition, the pressure used in the production process is different, which can easily cause product deformation and damage.

[0004] The prior art CN206455196U discloses a three-jaw chuck fixture for a CNC lathe, comprising jaw one, jaw two, jaw three, a fixing plate, a countersunk hole, a hexagon socket fixing bolt and a gasket. The jaw one, jaw two and jaw three are respectively mounted on the upper end surfaces of three groups of slide blocks. The cross-section of the jaw one is a rectangular structure, and the cross-sections of the jaw two and jaw three are L-shaped structures. This design realizes the clamping of special-shaped workpieces and improves the scope of application. The fixing plate is welded to the rear end surface of the jaw one, the countersunk hole is arranged on the fixing plate, the hexagon socket fixing bolt is assembled in the countersunk hole through the gasket, and the lower end of the hexagon socket fixing bolt is connected to the slide block. This design realizes the rapid installation and disassembly of the jaws. However, when the chuck is clamping the PVC-U drainage pipe, since the cross-section of the clamping claw is a rectangular structure, it has a line contact with the clamping surface of the PVC-U drainage pipe. If the holding force is too small, it will cause the PVC-U drainage pipe to loosen during processing, and if the holding force is too large, it will cause the PVC-U drainage pipe to be squeezed and deformed. Utility Model Content

[0005] To solve the above problems, the utility model proposes a pipe clamp, which can automatically apply uniform clamping force to the circumference of the plastic pipe through a tightening mechanism, and can effectively prevent the plastic pipe from loosening during processing or damage to the outer wall of the pipe due to excessive local pressure.

[0006] To achieve the above-mentioned purpose, a pipe clamp includes a sleeve, an elastic collet and a fixing piece, the sleeve and the elastic collet are hollow inside, the elastic collet is sleeved in the sleeve, the interior of the elastic collet is used to clamp the pipe, the fixing piece is threadedly connected to one end of the sleeve and abuts against the elastic collet so that its outer circumference bends inward to compress the pipe, and also includes a tightening mechanism and a driving device, the driving device is connected to the tightening mechanism and is used to drive the tightening mechanism to be connected to the fixing piece, and the tightening mechanism is used to be connected to the fixing piece to drive the fixing piece to rotate and be fixed on the sleeve.

[0007] In the present technical solution, after the elastic chuck is sleeved in the sleeve, the sleeve is installed in the fixture of the machine tool, the pipe is installed in the elastic chuck, and then the fixing piece is sleeved on one end of the sleeve. The driving device drives the tightening mechanism to be connected to the fixing piece, and the tightening mechanism is started to tighten the fixing piece. During the tightening process, the outer periphery of the elastic chuck gradually bends radially to press the pipe to achieve clamping of the pipe. This clamping method has a large contact area and a uniformly distributed clamping force, which can avoid damage to the pipe due to excessive local pressure.

[0008] As a preferred solution, in order to achieve automatic tightening of the fixing part, the tightening mechanism includes a translation module and a rack. The outer periphery of the fixing part is provided with gear teeth matched with the rack. The driving direction of the driving device is perpendicular to the axial direction of the fixing part. The translation module is fixed to the top of the driving device. The translation module moves along the tangential direction of the fixing part. The rack is fixed on the translation module and is parallel to the moving direction of the translation module.

[0009] As a preferred solution, the translation module includes a slider, a guide rail, a screw rod and a motor, both ends of the screw rod are rotatably connected to the guide rail, the driving end of the motor is connected to the screw rod, the slider is penetrated by a threaded hole adapted to the screw rod, the slider passes through the screw rod and is slidably connected to the guide rail, the rack is fixed to the top of the slider, and a torque sensor electrically connected to the motor is provided at the end of the screw rod. The screw rod rotates under the drive of the motor, driving the slider and the rack on the slider to translate, so that the rack drives the fixing part to rotate. During the tightening process of the fixing part, the torque sensor collects the torque of the screw rod in real time. When the torque reaches the tightening torque of the fixing part, the motor stops running, thereby realizing precise control of the clamping force of the pipe.

[0010] As a preferred solution, in order to avoid the tightening mechanism interfering with pipe processing, the driving device includes a base, two guide rods, a lifting block and a telescopic structure. The two guide rods are vertically fixed at both ends of the base, and the two ends of the lifting block are respectively provided with guide holes adapted to the guide rods. The lifting block is slidably connected to the guide rods through the guide holes. The telescopic structure is fixed on the base and the telescopic end of the telescopic structure corresponds to the bottom of the lifting block. During the clamping process, the telescopic end of the telescopic structure extends out to push the lifting block up, and drives the rack to a position engaged with the fixing part. After clamping is completed, the telescopic end of the telescopic structure retracts, and the lifting block descends under the action of gravity to avoid interfering with pipe processing.

[0011] As a preferred solution, a pressure sensor corresponding to the telescopic end of the telescopic structure is fixed to the bottom of the lifting block, and the pressure sensor can detect whether the rack rises to a position engaged with the fixing member.

[0012] As a preferred solution, in order to limit the installation of the sleeve, an annular limit platform is provided on the outer periphery of the sleeve. When the sleeve is installed in the machine tool fixture, the limit platform abuts against the end face of the machine tool fixture to achieve limitation.

[0013] As a preferred solution, in order to adapt to long-sized pipes, the bottom of the sleeve is detachably connected with an extension sleeve, and the interior of the extension sleeve is hollow and communicated with the sleeve.

[0014] As a preferred solution, in order to achieve all-round wrapping of the outer wall of the pipe, a plurality of wire grooves are provided along the circumference of the elastic chuck at one end away from the sleeve, and the plurality of wire grooves are arranged at intervals. The wire grooves can provide a contraction space for the elastic chuck. When the fixing is tightened, the outer circumference of the elastic chuck is radially tightened under the extrusion of the fixing; when the fixing is loosened, the elastic chuck is radially loosened.

[0015] As a preferred solution, in order to enable the fixing member to better squeeze the outer periphery of the elastic clamp, a first conical boss is provided on the outer periphery of one end of the elastic clamp, and a second conical boss corresponding to the first conical boss is provided on the inner wall of the fixing member.

[0016] In order to achieve the above-mentioned purpose, the utility model also provides a machine tool, including a bed, a clamping end and the above-mentioned pipe clamp, the sleeve is installed on the clamping end of the machine tool, the fixing part is located on the sleeve away from the clamping end of the machine tool, one end of the tightening mechanism is fixed to the bed of the machine tool, and the other end of the tightening mechanism is connected to the fixing part and drives the fixing part to rotate.

[0017] In the technical solution, the sleeve cooperates with the machine tool to work, the elastic chuck directly clamps the pipe instead of the clamping end of the machine tool, and the tightening mechanism is arranged on the machine tool bed to automatically tighten the fixing parts.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model can wrap the outer wall of the pipe in all directions through the elastic clamp and the fixing piece, the clamping force is evenly distributed, the clamping is reliable, and the damage to the pipe due to excessive local pressure is avoided.

[0020] 2. The fasteners can be automatically tightened through the tightening mechanism, making installation easy and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the pipe clamp of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the hidden tightening mechanism and driving device of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the casing;

[0024] Figure 4 It is a schematic diagram of the structure of the elastic collet;

[0025] Figure 5 yes Figure 4 A schematic diagram of the structure from another perspective;

[0026] Figure 6 It is a schematic diagram of the structure of the fixing parts;

[0027] Figure 7 It is a structural schematic diagram of the machine tool of the utility model.

[0028] In the figure: sleeve body 1; limit platform 101; elastic chuck 2; first conical boss 201; wire groove 202; fixing piece 3; second conical boss 301; extension sleeve 4; bottom cover 5; slider 6; rack 7; guide rail 8; screw rod 9; base 10; guide rod 11; lifting block 12; telescopic structure 13; pressure sensor 14; clamping end 15; bed 16. DETAILED DESCRIPTION

[0029] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0032] Embodiment 1:

[0033] like Figures 1 to 6 As shown, a pipe clamp is provided, including a sleeve 1, an elastic collet 2 and a fixing piece 3, wherein the interior of the sleeve 1 and the elastic collet 2 are hollow, the elastic collet 2 is sleeved in the sleeve 1, the interior of the elastic collet 2 is used for clamping the pipe, and the fixing piece 3 is threadedly connected to one end of the sleeve 1 and abuts against the elastic collet 2 to bend its outer circumference inward to compress the pipe.

[0034] In this embodiment, the fixing member 3 is hollow inside and is provided with an internal thread, the outer wall of one end of the sleeve body 1 is provided with an external thread, and the outer wall of the fixing member 3 is provided with a wrench position and a knurled position for connecting with a wrench.

[0035] Specifically, one end of the elastic clamp 2 away from the sleeve body 1 is provided with a plurality of wire grooves 202 along its axial direction, and the plurality of wire grooves 202 are arranged at intervals.

[0036] In this embodiment, eight wire grooves 202 are evenly arranged at one end of the elastic clamp 2. The eight wire grooves 202 form a contraction seam for contraction of one end of the elastic clamp 2 to clamp the pipe.

[0037] Specifically, a first conical boss 201 is provided on the outer periphery of one end of the elastic clamp 2 , and a second conical boss 301 corresponding to the first conical boss 201 is provided on the inner wall of the fixing member 3 .

[0038] In this embodiment, as the fixing member 3 is gradually tightened, the second conical boss 301 on the inner wall of the fixing member 3 abuts against the surface of the first conical boss 201 of the elastic clamp 2, so that the elastic clamp 2 gradually shrinks inwards and applies a uniform clamping force to the pipe.

[0039] Specifically, an annular limiting platform 101 is provided on the outer periphery of the sleeve body 1 .

[0040] In this embodiment, when the clamp of the present invention is installed on the clamping end of the machine tool, the limiting platform 101 abuts against the end surface of the clamping end to limit the installation position of the clamp.

[0041] Specifically, an extension sleeve 4 is screwed to the bottom of the sleeve body 1 , the interior of the extension sleeve 4 is hollow and communicated with the sleeve body 1 , and a bottom cover 5 is screwed to the rear end of the extension sleeve 4 .

[0042] In this embodiment, when a longer pipe needs to be clamped, an extension sleeve 4 can be screwed onto the tail end of the sleeve body 1. The extension sleeve 4 can prevent the tail end of the pipe from shaking violently when the machine tool rotates.

[0043] Embodiment 2:

[0044] This embodiment is similar to Embodiment 1, except that, in this embodiment, Figure 1 As shown, it also includes a tightening mechanism and a driving device, the driving device is connected to the tightening mechanism and is used to drive the tightening mechanism to be connected to the fixing member 3, the tightening mechanism is used to be connected to the fixing member 3 to drive the fixing member 3 to rotate and be fixed on the sleeve body 1, the tightening mechanism includes a translation module and a rack 7, the outer periphery of the fixing member 3 is provided with gear teeth adapted to the rack 7, the driving direction of the driving device is perpendicular to the axial direction of the fixing member 3, the translation module is fixed to the top of the driving device, the translation module moves along the tangential direction of the fixing member 3, and the rack 7 is fixed on the translation module and is parallel to the moving direction of the translation module.

[0045] In this embodiment, the driving device can drive the rack 7 to move up and down. When it rises, the rack 7 engages with the gear teeth on the outer wall of the fixing member 3. When it falls, the rack 7 is driven to separate from the fixing member 3 to avoid interfering with the processing of the pipe. The translation module is used to drive the rack 7 to translate to drive the fixing member 3 to rotate.

[0046] Specifically, the translation module includes a slider 6, a guide rail 8, a screw rod 9 and a motor. The two ends of the screw rod 9 are respectively rotatably connected to the guide rail 8, the driving end of the motor is connected to the screw rod 9, the slider 6 is penetrated by a threaded hole adapted to the screw rod 9, the slider 6 passes through the screw rod 9 and is slidably connected to the guide rail 8, the rack 7 is fixed to the top of the slider 6, and the end of the screw rod 9 is provided with a torque sensor electrically connected to the motor.

[0047] In this embodiment, when the rack 7 drives the fixing member 3 to be gradually tightened, the torque value of the torque sensor on the screw rod 9 gradually increases, and when the set torque threshold is reached, the motor is controlled to stop working.

[0048] Specifically, the driving device includes a base 10, two guide rods 11, a lifting block 12 and a telescopic structure 13. The two guide rods 11 are vertically fixed at both ends of the base 10, and the two ends of the lifting block 12 are respectively provided with guide holes adapted to the guide rods 11. The lifting block 12 is slidably connected to the guide rods 11 through the guide holes. The telescopic structure 13 is fixed on the base 10 and the telescopic end of the telescopic structure 13 corresponds to the bottom of the lifting block 12.

[0049] In this embodiment, the telescopic structure 13 is a telescopic cylinder, and the two guide rods 11 can ensure that the lifting block 12 is lifted and lowered smoothly without deviation.

[0050] Specifically, a pressure sensor 14 corresponding to the telescopic end of the telescopic structure 13 is fixed to the bottom of the lifting block 12 .

[0051] In this embodiment, as the lifting block 12 rises, the rack 7 meshes with the gear teeth on the outer wall of the fixing member 3, and the pressure value of the pressure sensor 14 gradually increases. When it rises to the pressure threshold, the telescopic structure 13 is controlled to retract, causing the lifting block 12 to descend.

[0052] Embodiment 3:

[0053] like Figure 7 As shown, a machine tool is provided, including a bed 16, a clamping end 15 and the above-mentioned pipe clamp, the sleeve 1 is installed on the clamping end 15 of the machine tool, the driving device is fixed to the bed 16 of the machine tool, and the driving end of the driving device drives the tightening mechanism to abut against the fixing member 3.

[0054] In this embodiment, the clamping end 15 clamps the sleeve 1, the limit platform 101 of the sleeve 1 abuts against the end surface of the clamping end 15, the bottom of the driving device is fixed to the bed 16 by bolts, and the driving device drives the tightening mechanism to connect with the fixing member 3. The tightening mechanism can automatically tighten the fixing member 3, and after tightening, the driving device drives the tightening mechanism to retreat to avoid interfering with the processing of the pipe.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A pipe clamp, characterized in that: The invention comprises a sleeve (1), an elastic chuck (2) and a fixing member (3), wherein the interiors of the sleeve (1) and the elastic chuck (2) are hollow, the elastic chuck (2) is sleeved in the sleeve (1), the interior of the elastic chuck (2) is used for clamping a pipe, the fixing member (3) is threadedly connected to one end of the sleeve (1) and abuts against the elastic chuck (2) so that its outer circumference is bent inwardly to compress the pipe, and further comprises a tightening mechanism and a driving device, the driving device being connected to the tightening mechanism and being used to drive the tightening mechanism to be connected to the fixing member (3), the tightening mechanism being used to be connected to the fixing member (3) to drive the fixing member (3) to be rotationally fixed on the sleeve (1).

2. A pipe clamp according to claim 1, characterized in that: The tightening mechanism comprises a translation module and a rack (7); the outer periphery of the fixing member (3) is provided with gear teeth matched with the rack (7); the driving direction of the driving device is perpendicular to the axial direction of the fixing member (3); the translation module is fixed to the top of the driving device; the translation module moves in the opposite direction along the tangent of the fixing member (3); the rack (7) is fixed to the translation module and is parallel to the moving direction of the translation module.

3. A pipe clamp according to claim 2, characterized in that: The translation module comprises a slider (6), a guide rail (8), a screw rod (9) and a motor. The two ends of the screw rod (9) are respectively rotatably connected to the guide rail (8). The driving end of the motor is connected to the screw rod (9). The slider (6) is penetrated by a threaded hole adapted to the screw rod (9). The slider (6) passes through the screw rod (9) and is slidably connected to the guide rail (8). The rack (7) is fixed to the top of the slider (6). The end of the screw rod (9) is provided with a torque sensor electrically connected to the motor.

4. A pipe clamp according to claim 2, characterized in that: The driving device comprises a base (10), two guide rods (11), a lifting block (12) and a telescopic structure (13); the two guide rods (11) are respectively vertically fixed at two ends of the base (10); two ends of the lifting block (12) are respectively provided with guide holes adapted to the guide rods (11); the lifting block (12) is slidably connected to the guide rods (11) through the guide holes; the translation module is fixed to the top of the lifting block (12); the telescopic structure (13) is fixed to the base (10) and the telescopic end of the telescopic structure (13) corresponds to the bottom of the lifting block (12).

5. A pipe clamp according to claim 4, characterized in that: A pressure sensor (14) corresponding to the telescopic end of the telescopic structure (13) is fixed to the bottom of the lifting block (12).

6. The pipe clamp according to claim 1, characterized in that: An annular limiting platform (101) is provided on the outer periphery of the sleeve body (1).

7. The pipe clamp according to claim 1, characterized in that: An extension sleeve (4) is detachably connected to the bottom of the sleeve body (1); the interior of the extension sleeve (4) is hollow and communicates with the sleeve body (1).

8. A pipe clamp according to any one of claims 1 to 7, characterized in that: One end of the elastic clamp (2) away from the sleeve body (1) is provided with a plurality of wire grooves (202) along its circumference, and the plurality of wire grooves (202) are arranged at intervals.

9. A pipe clamp according to claim 8, characterized in that: A first conical boss (201) is provided on the outer periphery of one end of the elastic clamp (2), and a second conical boss (301) corresponding to the first conical boss (201) is provided on the inner wall of the fixing member (3).

10. A machine tool, characterized in that: It comprises a clamping end (15), a bed (16) and a pipe clamp according to any one of claims 1 to 9, wherein the sleeve (1) is installed on the clamping end (15) of the machine tool, the driving device is fixed to the bed (16) of the machine tool, and the driving end of the driving device drives the tightening mechanism to abut against the fixing member (3).

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