Cutting machines for cutting tubular parts

Abstract

The present application relates to a cutting machine for cutting a tubular member. The cutting machine comprises a support unit, a feeding unit and a cutter unit. The feeding unit is supported by the support unit. The cutter unit is connected to the feeding unit. The feeding unit comprises a screw and a threaded member, the screw being configured to be threadably engaged with the threaded member so that the screw drives the cutter unit to move linearly while rotating.

Description

Technical Field

[0001] The present disclosure relates to a cutting machine for cutting a tubular member, and in particular, to a machine or device for cutting a thin-walled stainless steel pipe. Background Art

[0002] This section provides background information related to the present disclosure which is not necessarily prior art.

[0003] A cutting machine for cutting tubular members is known, which includes a base, a pair of rollers mounted on the base for supporting the tubular member, a cutting wheel for cutting the tubular member, a bracket for mounting the cutting wheel, and a movable member for mounting the bracket and moving with the bracket relative to the base. For such a cutting machine, the movable member is usually manually operated to make it approach the tubular member to be cut until it is at a predetermined distance from the tubular member, and then the handle is operated to move the cutting wheel or the bracket mounted with the cutting wheel so that it gradually contacts the tubular member while the tubular member rotates and cuts the tubular member. The operation of the cutting machine is both time-consuming and labor-intensive. In addition, the existing electric cutting machine is generally suitable for cutting tubular members of one size.

[0004] Therefore, it is desirable in the art to provide a cutting machine that can improve operating efficiency and is suitable for different sizes. Summary of the invention

[0005] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0006] According to one aspect of the present disclosure, a cutting machine for cutting a tubular member is provided. The cutting machine includes a support unit, a feeding unit and a cutter unit. The feeding unit is supported by the support unit. The cutter unit is connected to the feeding unit. The feeding unit includes a screw and a threaded member, and the screw is configured to be threadably engaged with the threaded member so that the screw drives the cutter unit to move linearly while rotating.

[0007] In some configurations, the threaded member is movable between a first position engaged with the screw and a second position disengaged from the screw.

[0008] In some configurations, the threaded member is pivotally mounted to the support unit.

[0009] In some configurations, the feeding unit further includes a sliding bracket slidably mounted to the supporting unit, and the screw rod is configured to be rotatable relative to the sliding bracket but unable to move axially relative to the sliding bracket.

[0010] In some configurations, a return spring is disposed between the sliding bracket and the supporting unit.

[0011] In some configurations, the feeding unit further includes a handle located at an end of the screw and used to drive the screw to rotate.

[0012] In some configurations, the cutting machine further includes a torque limiting unit configured to limit a maximum threshold of a torque applied by the handle to the screw rod.

[0013] In some configurations, the torque limiting unit is disposed between the handle and the screw.

[0014] In some configurations, the torque limiting unit includes a first member fixedly connected to one of the handle and the screw and a second member fixedly connected to the other of the handle and the screw. When the torque applied by the handle to the screw is less than the maximum threshold, the first member and the second member are engaged to rotate together; and when the torque applied by the handle to the screw is greater than or equal to the maximum threshold, the first member and the second member are disengaged and slide relative to each other.

[0015] In some configurations, the torque limiting unit further includes a movable member movable relative to at least one of the first member and the second member, and a biasing member for applying a biasing force to the movable member.

[0016] In some configurations, the first member has a receiving portion for receiving the movable member, and the second member has an engaging portion for engaging with the movable member.

[0017] In some configurations, the movable member includes a plurality of spherical members arranged along a circumferential direction, and the engaging portion has a recessed portion engaged with each of the spherical members.

[0018] In another form, the engaging portion is a boss provided on the second member.

[0019] In some configurations, a pressure plate is disposed between the biasing member and the plurality of balls.

[0020] In some configurations, the torque limiting unit further includes a nut member threadedly engaged with the first member, the nut member being capable of adjusting the biasing force of the biasing member when the nut member is rotated relative to the first member.

[0021] In some configurations, the torque limiting unit further includes a sheath disposed outside the nut member.

[0022] In some configurations, the cutter unit includes a cutter for cutting the tubular member and a cutter holder for mounting the cutter, and the cutter holder is mounted to the sliding bracket.

[0023] In some configurations, the knife is rotatably mounted to the knife holder and / or the knife holder is fixedly mounted to the sliding bracket by a pin.

[0024] In some configurations, the tool unit further includes auxiliary wheels located on both sides of the tool and auxiliary wheel brackets for mounting the auxiliary wheels. The auxiliary wheel brackets are mounted to the tool holder via a connecting member.

[0025] In some configurations, the cutting machine further includes an energy storage unit configured to apply a pre-cutting force to the cutter after the cutter contacts the tubular member.

[0026] In some configurations, the energy storage unit is disposed between the cutter unit and the feeding unit.

[0027] In some configurations, the energy storage unit includes a first spring and a second spring, the first spring is disposed between the sliding bracket and the tool holder, and the second spring is disposed between the tool holder and the connecting member.

[0028] In some configurations, the spring constant of the first spring is greater than the spring constant of the second spring.

[0029] In some configurations, the support unit includes a height-adjustable column. The column includes a first fixed member and a second movable member, and the second movable member can be installed at positions with different heights relative to the first fixed member.

[0030] In some configurations, the cutter includes a first cutter and a second cutter, the first cutter and the second cutter having the same structure and size.

[0031] In some configurations, the support unit includes a base, in which rollers for supporting the tubular member are disposed, the rollers being disposed in pairs along parallel axes. The cutting machine further includes a speed switch capable of changing the rotation speed of the rollers.

[0032] According to another aspect of the present disclosure, a cutting machine for cutting a tubular member is provided. The cutting machine comprises a support unit, a feeding unit, a cutter unit and an energy storage unit. The feeding unit is supported by the support unit. The cutter unit is connected to the feeding unit. The energy storage unit is disposed between the cutter unit and the feeding unit and is configured to apply a pre-cutting force to the cutter unit.

[0033] In some configurations, the cutter unit includes a cutter for cutting the tubular member and a cutter holder for mounting the cutter, and the cutter holder is mounted to the sliding bracket.

[0034] In some configurations, the tool unit further includes auxiliary wheels located on both sides of the tool and auxiliary wheel brackets for mounting the auxiliary wheels. The auxiliary wheel brackets are mounted to the tool holder via a connecting member.

[0035] In some configurations, the energy storage unit includes a first spring and a second spring, the first spring is disposed between the sliding bracket and the tool holder, and the second spring is disposed between the tool holder and the connecting member.

[0036] In some configurations, the spring constant of the first spring is greater than the spring constant of the second spring.

[0037] Further areas of applicability will become apparent from the description provided herein.The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

[0039] Figure 1 is a perspective schematic diagram of a cutting machine for cutting tubular members according to the principles of the present disclosure;

[0040] Figure 2 yes Figure 1 An exploded schematic diagram of a cutting machine shown in FIG.

[0041] Figure 3 yes Figure 1 A schematic cross-sectional view of a cutting machine shown in FIG.

[0042] Figure 4 yes Figure 3 An enlarged schematic diagram of a portion of a cutting machine showing the screw not engaged with the threaded member;

[0043] Figure 5 is similar to Figure 4 Schematic diagram showing the screw engaging with the threaded member;

[0044] Figure 6 is a three-dimensional schematic diagram of a torque limiting unit according to an embodiment of the present disclosure;

[0045] Figure 7 yes Figure 6 A schematic cross-sectional view of a torque limiting unit;

[0046] Figure 8 yes Figure 6 Another cross-sectional schematic diagram of the torque limiting unit;

[0047] Fig. 9yes Figure 6 An exploded schematic diagram of a torque limiting unit;

[0048] Fig.10 is an exploded schematic diagram of a tool unit according to an embodiment of the present disclosure;

[0049] Fig.11 yes Fig.10 A schematic diagram of the assembly of the tool unit;

[0050] Fig.12 is a perspective schematic diagram of an adjustable column according to an embodiment of the present disclosure;

[0051] Fig.13 is a schematic cross-sectional view of a cutting machine according to the principles of the present disclosure, wherein an adjustable column is located at a higher mounting position;

[0052] Fig.14 yes Fig.13 A schematic cross-sectional view of the cutting machine in an operating position; and

[0053] Fig.15 is a schematic cross-sectional view of a cutting machine according to another embodiment of the present disclosure, wherein the cutting machine includes a tool with double blades.

[0054] Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0056] Exemplary embodiments are provided so that the present disclosure will be thorough and will fully convey the scope to those skilled in the art. Many specific details such as examples of specific components, devices and methods are set forth to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, and that the exemplary embodiments can be implemented in many different forms and should not be construed as limiting the scope of the present disclosure. In some exemplary embodiments, well-known methods, well-known device structures and well-known technologies are no longer described in detail.

[0057] When an element or layer is referred to as being "located on another element or layer," "engaged to," "connected to," or "coupled to" another element or layer, the element or layer may be directly located on, engaged to, connected to, or coupled to the other element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as being "directly located on another element or layer," "directly engaged to," "directly connected to," or "directly coupled to" another element or layer, there will be no intermediate elements or layers. Other terms used to describe the relationship between elements (e.g., "located between" and "directly located between," "adjacent" and "directly adjacent," etc.) should be interpreted in a similar manner. As used herein, the term "and / or" includes any and all combinations of one or more of the related enumerated items.

[0058] Although the terms first, second, third, etc. can be used in this article to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not mean order or sequence when used in this article. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teachings of the exemplary embodiments.

[0059] Reference Figures 1 to 3 , a cutting machine 1 for cutting a tubular member 19 is shown, and the cutting machine 1 for cutting a tubular member may include a support unit 10, a tubular member operating unit 30, a feeding unit 20, and a cutter unit 70. The support unit 10 is configured to install and support other components of the cutting machine 1. The tubular member operating unit 30 is installed on the support unit 10 and is configured to support the tubular member 19 and drive the tubular member 19 to rotate. The feeding unit 20 is connected to the support unit 10 and can move relative to the support unit 10 with the cutter unit 70 so as to cut the tubular member 19 or return to the initial position after cutting the tubular member 19.

[0060] The support unit 10 may include a base 12 and a column 14. The tubular member operating unit 30 is mounted on the base 12, and the feeding unit 20 is connected to the column 14. The column 14 may be fixedly mounted on the base 12. In the illustrated example, the column 14 is mounted on the top of the base 12 and is arranged on one side of the base 12 so as to operate the tubular member 19 on the other side of the base 12. In an alternative embodiment, the column 14 and the base 12 may be an integral piece.

[0061] The tubular member operating unit 30 includes a power source 32 such as a motor and a roller 34 driven to rotate by the power source 32. The power source 32 is installed in the lower part of the base 12. The roller 34 is installed in the upper part of the base 12 and exposed from the top surface of the base 12. The rollers 34 are arranged side by side in pairs and can rotate around parallel axes 33. Preferably, the paired rollers 34 have the same structure and size. The paired rollers 34 form a bracket for supporting the tubular member and are configured to drive the tubular member 19 to rotate when they rotate in the same direction. Preferably, one roller 34 can be connected to the power source 32 and serve as a driving roller, while the other roller 34 can serve as a driven roller. When it is necessary to cut the tubular member 19, the tubular member 19 is placed on the two rollers 34, and then the rollers 34 are rotated in the same direction by the power source 32, thereby driving the tubular member 19 to rotate.

[0062] A variable speed transmission mechanism may be provided between the power source 32 and the roller 34. Accordingly, the tubular member operating unit 30 may further include a speed regulating switch 36. The speed regulating switch 36 may be provided on the base 12. The speed regulating switch 36 may be configured to change the rotation speed of the roller 34 and thus change the rotation speed of the tubular member 19 by switching the speed regulating switch 36. To this end, the speed regulating switch 36 may have a plurality of gears, wherein each gear corresponds to a certain speed range. Therefore, the corresponding gear of the speed regulating switch 36 may be selected according to the desired rotation speed of the tubular member 19.

[0063] The cutter unit 70 includes a cutter 72 and a cutter holder 74. The cutter 72 is mounted in the cutter holder 74. The cutter 72 may be in the form of a disk and have a peripheral cutting edge. The cutter holder 74 is connected to the feed unit 20 and moves toward or away from the tubular member 19 along with the feed unit 20. After the cutter 72 moves to contact the tubular member 19, the tubular member 19 is rotated and cut under the drive of the roller 34.

[0064] The feed unit 20 is connected to the column 14 in a manner that it can move relative to the column 14. When the feed unit 20 moves relative to the column 14, the feed unit 20 moves with the cutter unit 70 between a standby position (initial position) and an operating position (working position), wherein the cutter 72 of the cutter unit 70 is away from the tubular member 19 in the standby position, and the cutter 72 of the cutter unit 70 contacts the tubular member 19 and cuts the tubular member 19 in the operating position.

[0065] The feeding unit 20 includes a screw 52, ​​a threaded member 56 and a handle 54. The handle 54 is disposed at the upper end of the screw 52 and is configured to drive the screw 52 to rotate. The threaded member 56 includes a threaded portion 166. The threaded portion 166 of the threaded member 56 can engage with the threaded portion 126 of the screw 52. The threaded member 56 is mounted on the column 14. For example, the threaded member 56 can be mounted to the column 14 via a cover plate 58. The cover plate 58 is fixed to the column 14 to shield the screw 52, ​​thereby improving the safety of the cutting machine 1. For example, the threaded member 56 can be pivotally mounted on the cover plate 58 via a pin 164. The threaded member 56 can be in a first position (such as a first position) engaged with the screw 52. Figure 3 and Figure 5 ) and a second position not engaged with the screw 52 (as shown Figure 4 The threaded member 56 may also include a handle portion 162 so that an operator can manually operate the threaded member 56. The handle portion 162 and the threaded portion 166 may be located on opposite sides of the pin 164. In an alternative embodiment, the threaded member 56 may also be configured to be automatically actuated to engage or disengage with the screw 52.

[0066] When the threaded member 56 is in the Figure 3 and Figure 5 In the first position shown, the operating handle 54 rotates the screw rod 52. Since the screw rod 52 is threadedly engaged with the threaded member 56, the screw rod 52 can move up and down (axially) while rotating, thereby moving the tool unit 70 up and down.

[0067] When the threaded member 56 is in the Figure 4 In the second position shown, the screw rod 52 will not move up and down even if the screw rod 52 is rotated.

[0068] The feeding unit 20 may further include a sliding bracket 22 disposed on the column 14 and linearly sliding relative to the column 14. The sliding bracket 22 is an elongated member extending generally longitudinally. The sliding bracket 22 has a first end (upper end) 111 and a second end (lower end) 112 opposite to the first end 111 in the longitudinal direction (i.e., the vertical direction or the sliding direction). In the illustrated example, the upper end of the column 14 has a substantially U-shaped cross section so as to receive the sliding bracket 22 and guide the sliding bracket 22 to slide therein.

[0069] The screw rod 52 is arranged in the sliding bracket 22 in the following manner: the screw rod 52 can rotate relative to the sliding bracket 22, but cannot move axially relative to the sliding bracket 22. In other words, the position of the screw rod 52 relative to the sliding bracket 22 in the vertical direction is basically unchanged. Figure 2As shown, the screw 52 includes a threaded portion 126, a head 121, and a neck 123 located between the threaded portion 126 and the head 121. The size (e.g., diameter) of the neck 123 is smaller than the size (e.g., diameter) of the threaded portion 126 and the head 121. That is, the neck 123 is recessed relative to the threaded portion 126 and the head 121. The second end 112 of the sliding bracket 22 is provided with a stopper (or retaining portion) 113 protruding inwardly. The stopper 113 is engaged with the neck 123 to prevent the screw 52 from moving in the vertical direction relative to the sliding bracket 22.

[0070] When the threaded member 56 is in the Figure 4 When the handle 54 is in the second position shown, the handle 54 can be directly pressed downward, thereby allowing the feed unit 20 and the cutter unit 70 to move quickly toward the tubular member 19. By moving the threaded member 56 to the first position, the screw 52 and the cutter 72 can be locked in a suitable vertical position without rotating the screw 52. For example, when the cutter 72 is in contact with the tubular member 19, the threaded member 56 can be moved to the first position, thereby locking the screw 52 and the cutter 72 in the working position without rotating the screw 52. At this time, even if the downward pressure applied to the handle 54 is removed, the screw 52 and the cutter 72 will not return to the initial position.

[0071] A biasing member 15, such as a return spring, for biasing the sliding bracket 22 to the standby position may also be provided between the sliding bracket 22 and the column 14. After the tubular member 19 is cut, the threaded member 56 is moved to the second position, and under the action of the biasing member 15, the sliding bracket 22 returns to the standby position.

[0072] As described above, by applying downward force to the sliding bracket 22, the sliding bracket 22 can quickly move linearly to the operating position. Therefore, the feeding unit 20 according to the present disclosure can quickly feed the cutter unit 70 to the operating position, and can quickly return to the standby position under the action of the biasing member 15.

[0073] The cutting machine 1 may further include a torque limiting unit 40. The torque limiting unit 40 is configured to limit a maximum threshold of the torque applied by the handle 54 to the screw rod 52. Figures 6 to 9 , which schematically shows an example of a torque limiting unit 40. As shown in the figure, the torque limiting unit 40 can be disposed between the handle 54 and the screw 52. The torque limiting unit 40 connects the handle 54 to the screw 52 in a manner that can transmit torque. When the handle 54 rotates, the torque can be transmitted to the screw 52 and the screw 52 can be rotated. The torque limiting unit 40 is configured to disconnect the handle 54 from the screw 52 when the torque reaches a predetermined threshold, so that the torque is no longer transmitted from the handle 54 to the screw 52.

[0074] The torque limiting unit 40 includes a first member 41 fixedly connected to the handle 54 and a second member 42 fixedly connected to the screw 52. For example, the first member 41 is connected to the handle 54 via a pin, and the second member 42 is connected to the screw 52 via a pin. The first member 41 has an axially extending rod connected to the handle 54 and a disc-shaped portion extending radially outward at one end of the rod. Similarly, the second member 42 has an axially extending rod connected to the screw 52 and a disc-shaped portion extending radially outward at one end of the rod. The disc-shaped portion of the first member 41 abuts against the disc-shaped portion of the second member 42.

[0075] The torque limiting unit 40 also includes a spherical member 43, such as a steel ball, disposed between the disk portion of the first member 41 and the disk portion of the second member 42. The illustrated example includes six spherical members 43 evenly distributed in the circumferential direction. The first member 41 has a receiving portion 412 for accommodating the spherical member 43. The receiving portion 412 is a through hole disposed in the disk portion of the first member 41. The spherical member 43 can move in the axial direction in the through hole, and therefore can also be referred to as a movable member. The second member 42 has a coupling portion 422 for engaging with the spherical member 43. The coupling portion 422 is a boss disposed on the disk portion of the second member 42, and the boss has a recess that engages with each of the spherical members.

[0076] The torque limiting unit 40 further includes a biasing member 44, such as a spring, for applying a biasing force to the ball 43. When the torque applied to the screw 52 via the handle 54 is less than the maximum threshold, the biasing member 44 biases the ball 43 and engages it in the boss of the second member 42. Thus, the engagement of the first member 41 and the second member 42 can be achieved to effectively transfer the torque from the first member 41 to the second member 42, so that the first member and the second member rotate together. When the torque applied to the screw 52 via the handle 54 is greater than or equal to the maximum threshold, the biasing force applied by the biasing member 44 to the ball 43 is not enough to engage the ball 43 in the boss of the second member 42, so the ball slides out of the boss. In this way, the first member 41 and the second member 42 disengage and slide relative to each other. At this time, the torque cannot be effectively transferred from the first member 41 to the second member 42, so the handle 54 can no longer drive the screw 52 to rotate.

[0077] In order to prevent the ball 43 from falling out of the through hole of the first member 41, a pressure plate 48 may be provided between the biasing member 44 and the ball 43. The pressure plate 48 is located on the side of the disk portion of the first member 42 opposite to the second member 42. The torque limiting unit 40 may further include a retainer 45 for mounting and retaining the biasing member 44.

[0078] In addition, the torque limiting unit 40 may further include an adjustment device for adjusting the biasing force of the biasing member 44. The adjustment device is a nut member 49 in the illustrated example. A thread engaged with the nut member 49 is provided on the rod portion of the first member 41. The biasing member 44 may be compressed or stretched by rotating the nut member 49 relative to the first member 41, thereby adjusting the force applied by the biasing member 44 to the ball.

[0079] The torque limiting unit 40 may further include a sheath 46 disposed outside the nut member 49 to prevent misoperation of the nut member 49. Optionally, a gasket 47 may be disposed between the nut member 49 and the retainer 45. It should be understood that the torque limiting unit 40 of the present disclosure is not limited to the specific example shown in the figure, but any device known in the art that can transmit, limit and / or adjust torque may be used.

[0080] Fig.10 and Fig.11 One example of a cutter unit 70 according to the present disclosure is shown. Fig.10 and Fig.11 The tool unit 70 shown allows for a rapid replacement of the tools 74 .

[0081] like Fig.10 and Fig.11 As shown, the tool holder 74 is Y-shaped or yoke-shaped and has a base and two separate legs extending from the same side of the base. The tool 72 is mounted in the middle of the two legs of the tool holder 74 by a pin 71. The base of the tool holder 74 is connected to the sliding bracket 22 by a pin 73.

[0082] The cutter unit 70 may further include auxiliary wheels 75 and auxiliary wheel brackets 76. The auxiliary wheels 75 are located on both sides of the cutter 72 and are mounted on the auxiliary wheel brackets 76 via respective pins 77. The auxiliary wheel brackets 76 are mounted or connected to the cutter holder 74 via a connection member 78 such as a pin.

[0083] When the tool is worn or damaged and needs to be replaced, the pin (e.g., steel ball pin) 73 is pulled outward from the tool holder, and the tool 72 and the tool holder 74 can be removed from the feeding unit 20. However, by pulling out the pin (e.g., steel ball pin) 71, the worn or damaged tool 72 can be removed from the tool holder 74. At this time, a new tool can be installed on the tool holder 74.

[0084] Refer to Figure 3According to the present disclosure, the cutting machine 1 may further include an energy storage unit 50. The energy storage unit 50 is connected to the feeding unit 20 and is configured to apply a pre-cutting force to the cutter 72. As shown in the figure, the energy storage unit 50 includes a first spring 53 and a second spring 55. The first spring 53 is disposed between the sliding bracket 22 and the cutter holder 74, and the second spring 55 is disposed between the cutter holder 74 and the connecting member. The spring constant of the first spring 53 is greater than the spring constant of the second spring 55. The size of the first spring 53 may be greater than the size of the second spring 55.

[0085] When the cutter unit 70 moves toward the tubular member, the auxiliary wheel 75 contacts the tubular member first, and then the cutter 72 contacts the tubular member. After the auxiliary wheel 75 contacts the tubular member 19, the auxiliary wheel bracket 76 transmits the force from the auxiliary wheel 75 to the second spring 55 via the connecting member 78. The second spring 55 is deformed to press the cutter 72 downward, and the cutter 72 then contacts the tubular member 19.

[0086] When the handle 54 is further rotated, the screw 52 moves downward and deforms the first spring 53. The first spring 53 applies a downward force (i.e., a pre-cutting force) to the cutter holder 74. When the desired pre-cutting force is reached, the roller is activated to rotate the tubular member 19 for cutting.

[0087] Fig.12 One example of a column 14 according to the present disclosure is shown; Fig.13 A schematic cross-sectional view of the cutting machine showing the column 14 in a higher mounted position; and Fig.14 Show Fig.13 The cross-sectional schematic diagram of the cutting machine when being in the operating position. As shown in the figure, the column 14 is a column that can adjust the height.

[0088] The column 14 includes a first fixed member 141 and a second movable member 143 movable relative to the first fixed member 141. The first fixed member 141 is fixedly mounted on the base 12. The second movable member 143 is connected to the first fixed member 141 by a fastener. A plurality of mounting holes may be provided in the first fixed member 141 and the second movable member 143 along their longitudinal direction. The second movable member 143 is connected to the first fixed member 141 by fasteners by inserting pins 145 and 147 into the mounting holes. By selecting the mounting holes, the height of the column 14 can be changed, thereby being suitable for tubular members of different sizes (diameters). Figure 12 to Figure 14 In the embodiment, by inserting the pins 145 and 147 into the mounting holes below the second movable member 143, the height of the column 14 can be increased, so that a large-sized tubular member can be cut. Figure 3 In the embodiment, by inserting the pins 145 and 147 into the mounting holes above the second movable member 143, the height of the column 14 can be reduced, so that a small-sized tubular member can be cut.

[0089] Fig.15 A variation of the cutting machine 1 according to the present disclosure is shown. As shown, the cutting machine 1 includes a first cutter 72a and a second cutter 72b. The first cutter 72a and the second cutter 72b are located in the same plane and are mounted on parallel axes. The first cutter 72a and the second cutter 72b have the same structure and size and are symmetrically arranged relative to the cutter holder. In this way, the stability and accuracy when cutting the tubular member can be improved, and the cutter can be prevented from deviating from the cutting position.

[0090] The following describes the process of cutting a tubular member 19 using the cutting machine 1 according to the present disclosure. The tubular member 19 to be cut is placed on the roller 34. When the threaded member is not engaged with the screw, a downward force can be directly applied to the feed unit 20. In the illustrated example, a downward force is applied to the handle 54, so that the feed unit 20 and the cutter unit 70 move linearly downward together until the auxiliary wheel 75 abuts against the tubular member 19 (such as Figure 3 As shown). Alternatively, when the threaded member is engaged with the screw rod, the screw rod 52 is rotated by rotating the handle 54, whereby the screw rod 52 drives the cutter unit 70 to move downward together until the auxiliary wheel 75 abuts against the tubular member 19. At this time, the spring as the energy storage element 53 is in an uncompressed free state. Next, the handle 54 is rotated. Driven by the handle 54, the screw rod 52 moves further downward, thereby applying a pre-cutting force to the cutter 72. When the desired pre-cutting force is reached, the power source 32 such as a motor is started. Driven by the power source 32, the paired rollers 34 rotate in the same direction, so that the tubular member 19 also rotates. At this time, under the action of the pre-cutting force, the tubular member 19 begins to be cut until the tubular member 19 is cut off. The spring of the energy storage unit 50 returns to the initial uncompressed state. The handle portion 162 of the threaded member 56 is operated so that the threaded portion 166 of the threaded member 56 is disengaged from the threaded portion 126 of the screw rod 52. Under the action of the return spring as the biasing member 15 , the feed unit 20 together with the cutter unit 70 returns upward to the standby position or the initial position.

[0091] The cutting machine according to the present disclosure can bring many advantages. As described above, the feeding unit can quickly or accurately move the cutter to the operating position, and the structure is compact. An energy storage unit is provided in the cutting machine, so that after the cutter moves to contact with the tubular member and before the tubular member rotates for cutting, the required pre-pressure can be applied to the tubular member through the energy storage unit. In this way, once the tubular member rotates, the cutting process of the tubular member begins. Compared with the existing cutting machine in which the cutter cuts the tubular member by continuously pressing down the handle, the cutting process of the cutting machine disclosed in the present disclosure is automatically realized without the operator continuously operating the handle, so the cutting efficiency can be improved and a substantially constant cutting force can be maintained.

[0092] The cutting machine according to the present disclosure may further include a torque limiting unit. The torque limiting unit can limit the magnitude of the pre-pressure applied to the tubular member, that is, the magnitude of the cutting force for cutting the tubular member can be limited. In this way, damage to the tubular member or the cutter due to excessive cutting force can be avoided.

[0093] The torque limiting unit includes an adjusting member for adjusting the pre-pressure applied to the tubular member. Therefore, for tubular members to be cut having different materials, thicknesses and / or sizes, the adjusting member can be used to adjust so that an optimal pre-pressure can be applied to the tubular member. Thus, the cutting machine according to the present disclosure can be suitable for cutting various tubular members.

[0094] In the illustrated example, the screw can rotate relative to the sliding bracket but cannot move axially, and the threaded member is configured to engage with the screw. Therefore, after the sliding bracket quickly slides to the operating position relative to the column, the sliding bracket can be locked in the operating position by the engagement of the threaded member with the screw; in addition, when the energy storage unit is operated, the engagement of the threaded member with the screw can cause the screw to move toward the tubular member while rotating to apply pre-pressure to the tubular member. Therefore, the threaded member according to the present disclosure can not only lock the sliding bracket, but also achieve the application of pre-pressure to the tubular member. Moreover, the energy storage unit of the present disclosure can slowly and gradually increase the pre-pressure applied to the tubular member by converting the rotational motion into the axial motion to apply pre-pressure to the tubular member.

[0095] The cutting machine according to the present disclosure has a column with adjustable height, so the cutting machine is suitable for cutting not only large-sized tubular parts but also small-sized tubular parts. The height of the column is adjusted according to the size of the tubular part, thereby shortening the moving distance of the sliding bracket to further improve the working efficiency.

[0096] The cutting machine according to the present disclosure may have a first cutter and a second cutter, and thus may stably cut a tubular member and prevent the cutter from deviating from a cutting position.

[0097] The cutting machine according to the present disclosure may have a speed regulating switch, so that the rotation speed of the roller and the tubular member can be changed according to specific cutting conditions or requirements. For example, in the case of a small-sized tubular member, the roller and the tubular member can be adjusted to a lower rotation speed; in the case of a large-sized tubular member, the roller and the tubular member can be adjusted to a higher rotation speed. In this way, the cutting process of the tubular member can be further optimized.

[0098] Although the cutting machine of the present disclosure is described above in conjunction with the specific examples shown in the drawings, it should be understood that the arrangement, configuration, etc. of the above-mentioned various units, components or members may be changed as long as the above-mentioned functions can be achieved.

[0099] The energy storage element may not be arranged between the feed unit and the cutter unit, for example, it may be arranged to apply a biasing force only to the feed unit, wherein the feed unit is fixedly connected to a cutter holder of the cutter unit to transmit the biasing force to the tubular member via the cutter unit.

[0100] For example, a screw rod may be fixed to the post, while a threaded member engaged with the screw rod is allowed to move axially, the screw rod member being connected to the energy storage element so as to apply pre-stress to the tubular member.

[0101] It should be understood that the foregoing description made for illustrative purposes is not intended to be exhaustive or limit the present disclosure. Each element or feature of a particular embodiment is usually not limited to the particular embodiment, but is interchangeable and can be used in a selected embodiment even if not specifically shown or described, where applicable. Each element or feature of a particular embodiment can also be changed in many ways. Such a change should not be considered to be contrary to the present disclosure, and all such modifications are intended to be included in the scope of the present disclosure.

Claims

1. A cutting machine for cutting a tubular member, comprising: Support unit (10); A feeding unit (20), the feeding unit (20) being supported by the supporting unit (10) and comprising a sliding bracket (22) slidably mounted to the supporting unit (10); and a cutter unit (70) connected to the feeding unit (20) and comprising a cutter (72) for cutting a tubular member and a cutter holder (74) for mounting the cutter (72), the cutter holder (74) being mounted to the sliding bracket (22); Power source (32); as well as A pair of rollers (34), the rollers being configured to rotate under the drive of the power source, for supporting the tubular member to be cut and being capable of driving the tubular member to rotate; The feeding unit (20) further comprises a screw (52) and a threaded member (56), wherein the screw (52) is configured to be threadably engaged with the threaded member (56) so that the screw (52) drives the tool unit (70) to move linearly while rotating. The tool unit (70) further comprises auxiliary wheels (75) located on both sides of the tool (72) and auxiliary wheel brackets (76) for mounting the auxiliary wheels (75), wherein the auxiliary wheel brackets (76) are mounted to the tool holder (74) via a connecting member (78); The cutting machine further comprises an energy storage unit (50), which is arranged between the cutter unit (70) and the feeding unit (20) and is configured to apply a pre-cutting force to the cutter (72) after the cutter (72) contacts the tubular member; The energy storage unit (50) comprises a first spring (53) and a second spring (55), wherein the first spring (53) is arranged between the sliding bracket (22) and the tool holder (74), and the second spring (55) is arranged between the tool holder (74) and the connecting member (78); and When the auxiliary wheel (75) contacts the tubular member, the auxiliary wheel bracket (76) transmits the force from the auxiliary wheel (75) to the second spring (55) via the connecting member (78), so that the second spring (55) is deformed and presses the tool (72) downward, so that the tool (72) contacts the tubular member. wherein the power source is configured to be activated when the pre-cutting force reaches a desired pre-cutting force, so that the roller drives the tubular member to rotate, Wherein, the spring constant of the first spring (53) is greater than the spring constant of the second spring (55).

2. The cutting machine according to claim 1, wherein: The threaded member (56) is movable between a first position engaged with the screw (52) and a second position disengaged from the screw (52).

3. The cutting machine according to claim 2, wherein: The threaded member (56) is pivotably mounted to the support unit (10).

4. The cutting machine according to claim 2, wherein: The screw rod (52) is configured to be rotatable relative to the sliding bracket (22) but cannot be axially moved relative to the sliding bracket (22).

5. The cutting machine according to claim 4, wherein: A return spring (15) is arranged between the sliding bracket (22) and the supporting unit (10).

6. The cutting machine according to claim 4, wherein: The feeding unit (20) further includes a handle (54) located at the end of the screw rod (52) and used for driving the screw rod (52) to rotate.

7. The cutting machine according to claim 6, wherein: The cutting machine (1) further comprises a torque limiting unit (40), wherein the torque limiting unit (40) is configured to limit a maximum threshold of a torque applied by the handle (54) to the screw rod (52).

8. The cutting machine according to claim 7, wherein: The torque limiting unit (40) is disposed between the handle (54) and the screw rod (52).

9. The cutting machine according to claim 8, wherein: The torque limiting unit (40) includes a first member (41) fixedly connected to one of the handle (54) and the screw (52) and a second member (42) fixedly connected to the other of the handle (54) and the screw (52). When the torque applied by the handle (54) to the screw (52) is less than the maximum threshold, the first component and the second component engage and rotate together; and when the torque applied by the handle (54) to the screw (52) is greater than or equal to the maximum threshold, the first component and the second component disengage and slide relative to each other.

10. The cutting machine according to claim 9, wherein: The torque limiting unit (40) further includes a movable member (43) movable relative to at least one of the first member and the second member, and a biasing member (44) for applying a biasing force to the movable member (43).

11. The cutting machine according to claim 10, wherein: The first member (41) has a receiving portion (412) for receiving the movable member (43), and the second member (42) has a coupling portion (422) for coupling with the movable member (43).

12. The cutting machine according to claim 11, wherein: The movable member (43) includes a plurality of spherical members arranged along the circumferential direction, and the engaging portion (422) has a recessed portion engaged with each of the spherical members.

13. The cutting machine according to claim 12, wherein: The engaging portion (422) is a boss disposed on the second member (42).

14. The cutting machine according to claim 12, wherein: A pressure plate (48) is disposed between the biasing member (44) and the plurality of balls.

15. The cutting machine according to claim 10, wherein: The torque limiting unit (40) further includes a nut member (49) threadedly engaged with the first member, the nut member (49) being capable of adjusting the biasing force of the biasing member (44) when rotating relative to the first member.

16. The cutting machine according to claim 15, wherein: The torque limiting unit (40) further includes a sheath (46) disposed outside the nut member (49).

17. The cutting machine according to claim 1, wherein: The tool (72) is rotatably mounted to the tool holder (74), and / or the tool holder (74) is fixedly mounted to the sliding bracket (22) via a pin.

18. A cutting machine according to any one of claims 1 to 17, wherein: The support unit (10) comprises a height-adjustable column (14), wherein the column (14) comprises a first fixed member (141) and a second movable member (143), wherein the second movable member (143) can be installed at positions having different heights relative to the first fixed member (141).

19. A cutting machine according to any one of claims 1 to 17, wherein: The tool (72) includes a first tool (72a) and a second tool (72b), wherein the first tool (72a) and the second tool (72b) have the same structure and size.

20. A cutting machine according to any one of claims 1 to 17, wherein: The support unit (10) comprises a base (12), in which the rollers (34) are arranged, and the rollers (34) are arranged in pairs along parallel axes. The cutting machine (1) also includes a speed switch (36) capable of changing the rotation speed of the roller (34).

21. A cutting machine according to any one of claims 1 to 17, wherein: The power source includes a motor.

22. A cutting machine for cutting a tubular member, comprising: Support unit (10); A feeding unit (20), the feeding unit (20) being supported by the supporting unit (10) and comprising a sliding bracket (22) slidably mounted to the supporting unit (10); a cutter unit (70) connected to the feeding unit (20) and comprising a cutter (72) for cutting a tubular member and a cutter holder (74) for mounting the cutter (72), the cutter holder (74) being mounted to the sliding bracket (22); and an energy storage unit (50), the energy storage unit (50) being disposed between the cutter unit (70) and the feeding unit (20) and being configured to apply a pre-cutting force to the cutter unit (70) after the cutter (72) contacts the tubular member; Power source (32); as well as a pair of rollers (34), which are configured to rotate under the drive of the power source, and are used to support the tubular member to be cut and can drive the tubular member to rotate, The tool unit (70) further comprises auxiliary wheels (75) located on both sides of the tool (72) and auxiliary wheel brackets (76) for mounting the auxiliary wheels (75), wherein the auxiliary wheel brackets (76) are mounted to the tool holder (74) via a connecting member (78); The energy storage unit (50) comprises a first spring (53) and a second spring (55), wherein the first spring (53) is arranged between the sliding bracket (22) and the tool holder (74), and the second spring (55) is arranged between the tool holder (74) and the connecting member (78); and When the auxiliary wheel (75) contacts the tubular member, the auxiliary wheel bracket (76) transmits the force from the auxiliary wheel (75) to the second spring (55) via the connecting member (78), so that the second spring (55) is deformed and presses the tool (72) downward, so that the tool (72) contacts the tubular member. wherein the power source is configured to be activated when the pre-cutting force reaches a desired pre-cutting force, so that the roller drives the tubular member to rotate, Wherein, the spring constant of the first spring (53) is greater than the spring constant of the second spring (55).

23. The cutting machine according to claim 22, wherein: The power source includes a motor.

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