Pipe shear and pipe installation device
By designing the quadratic curved duct surface, the problem of unstable contact of existing pipe shears when shearing polypropylene pipes is solved, the stable positioning of the pipe and the straightness of the shear surface are achieved, and the deformation of the pipe is avoided.
Patent Information
- Application Number
- CN202421443118.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-21
AI Technical Summary
When existing pipe shears are shearing polypropylene pipes, the contact between the pipe surface and the pipe is unstable, resulting in the pipe being easily deformed or swinged during the shearing process.
A pipe shear is designed, and the cross-section of the duct surface along the cutting direction is curved, which satisfies the quadratic curve, can automatically center and correct the position of the pipe, form two arc surfaces to position, increase the contact area of the pipe, and reduce the stress of the pipe.
The stable positioning of the pipe during the shearing process is achieved, the unevenness of the pipe stress is reduced, the deformation of the pipe is avoided, and the straightness of the cutting surface is improved.
Smart Images
Figure CN222792124U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipe laying tools, in particular to a pipe shear and a pipe installation device. Background Art
[0002] Water supply pipe systems mostly use PPR plastic pipes (i.e. polypropylene pipes). Polypropylene pipes are a type of polymer pipe made of polypropylene as the main raw material. They are pipe materials often used in the construction industry. They not only have good corrosion resistance and thermal insulation, but also have strong plasticity, good heat resistance and anti-permeability. Polypropylene pipes have a long service life of up to about 50 years, so they are widely used as pre-buried pipes or embedded in walls.
[0003] PPR plastic pipes often need to be cut with the help of pipe shears. The pipe shears have a holding surface for dragging the pipe. When cutting, the pipe is placed on the holding surface of the pipe shears and fixed. The pipe is cut by the blades on the pipe shears. Therefore, the holding surface needs to fix the pipe well.
[0004] The shapes of the existing pipe shearing tube support surface are "V"-shaped support surface and "U"-shaped arc support surface. The "V"-shaped support surface has better automatic centering, but the contact with the pipe is two straight lines, the force on the pipe at the contact line is relatively large, and it is easy to deform when thin pipes are sheared; the "U"-shaped arc support surface has a surface contact between the pipe and the support surface, and the pipe is easy to swing and unstable.
[0005] Therefore, there is an urgent need to develop a pipe shear that can stabilize the pipe and reduce the stress on the pipe. Utility Model Content
[0006] The utility model aims to provide a pipe shear and a pipe installation device, which can stabilize the pipe on the tube support surface and reduce the stress on the pipe to avoid deformation of the pipe.
[0007] The embodiment of the utility model is achieved as follows:
[0008] In a first aspect, the utility model provides a pipe shear, comprising a knife holder and a movable handle, a blade is mounted on the movable handle, the movable handle is rotatably connected to the knife holder, and an end of the knife holder is provided with a holding surface facing the blade;
[0009] The cross section of the hosting surface along the cutting direction is a curve shape, and the curve shape satisfies a quadratic curve.
[0010] In an optional embodiment, the expression of the quadratic curve is y=ax 2 .
[0011] In an optional embodiment, a mounting opening is provided on the blade holder, one end of the blade is fixed to the movable handle, and the other end of the blade extends out of the mounting opening.
[0012] In an optional embodiment, a cutting slit that matches the blade is provided on the hosting surface of the tool holder, and the cutting slit is communicated with the mounting port.
[0013] In an optional embodiment, a rotating shaft is also included, and a first rotating hole, a second rotating hole and a third rotating hole are respectively provided on the tool holder, the movable handle and the blade, the second rotating hole on the movable handle and the third rotating hole on the blade are positioned correspondingly, and the rotating shaft passes through the first rotating hole, the second rotating hole and the third rotating hole to realize the rotating connection between the movable handle and the tool holder.
[0014] In an optional embodiment, a mounting groove is provided at the end of the movable handle, one end of the blade extends into the mounting groove and is fixedly connected to the movable handle, and second rotating holes are provided on the wall surfaces on both sides of the mounting groove.
[0015] In an optional embodiment, one end of the blade is fixed to the movable handle by a screw.
[0016] In an optional embodiment, it further comprises an elastic member, one end of the elastic member is connected to the knife holder, and the other end of the elastic member is connected to the movable handle;
[0017] When the movable handle is tightened, the elastic member contracts; when the movable handle is loosened, the elastic member returns to its original position.
[0018] In an optional embodiment, a lock is further included, which is arranged at an end of the tool holder away from the hosting surface, and is used to lock the ends of the tool holder and the movable handle when not in operation.
[0019] In a second aspect, the utility model provides a pipe installation device, comprising the pipe cutter of any one of the aforementioned embodiments.
[0020] The beneficial effect of the embodiment of the utility model is that during use, the pipe is placed on the manipulating surface at the end of the knife holder, and the movable handle is tightened to make the blade cut into the pipe. During the cutting process, since the cross section of the manipulating surface is in the shape of a quadratic curve, the quadratic curve manipulating surface will automatically center and correct the pipe, forming two arc surfaces for positioning, which can make the positioning of the pipe relatively stable, and the pipe can withstand a certain shear force on the manipulating surface without deformation. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 A schematic diagram of a "V"-shaped hosting surface used in the prior art;
[0023] Figure 2 A schematic diagram of a "U"-shaped hosting surface used in the prior art;
[0024] Figure 3 A schematic diagram of a quadratic curve hosting surface provided by an embodiment of the utility model;
[0025] Figure 4 A schematic diagram of the structure of the pipe shears provided in the embodiment of the utility model;
[0026] Figure 5 for Figure 4 Schematic diagram of the structure of the movable handle.
[0027] Icons: 001- pipe; 002- V-shaped hosting surface; 003- U-shaped hosting surface; 100- pipe shears; 110- knife holder; 111- hosting surface; 112- installation opening; 113- cutting gap; 114- first rotating hole; 120- movable handle; 121- second rotating hole; 122- installation slot; 130- blade; 140- rotating shaft; 150- screw; 160- elastic member; 170- lock. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] Figure 1 and Figure 2 There are two types of hosting surfaces in the prior art. Figure 1 The middle pipe 001 is placed on the V-shaped hosting surface 002, and the automatic centering is better, but the contact with the pipe 001 is two straight lines, and the force on the pipe 001 at the contact line is relatively large, and the thin pipe is easy to deform when shearing; Figure 2 The middle pipe 001 is placed on the U-shaped hosting surface 003, and the contact between the pipe 001 and the U-shaped hosting surface 003 is a surface contact, so the pipe 001 is easy to swing and is unstable.
[0035] Please refer to Figure 3 and Figure 4The embodiment of the utility model provides a pipe cutter 100, including a knife holder 110 and a movable handle 120, a blade 130 is mounted on the movable handle 120, and a holding surface 111 is provided at the end of the knife holder 110 facing the blade 130. When in use, the pipe 001 is placed on the holding surface 111 and cut by the blade 130.
[0036] like Figure 3 As shown, the cross section of the trustee surface 111 along the cutting direction is a curve type, and the curve type satisfies a quadratic curve. Different diameter pipes can automatically find the positioning surface for positioning. Placing the pipe 001 on the trustee surface 111 not only retains the advantages of the "V"-shaped trustee's automatic centering, but also ensures that the pipe and the trustee have two arc surfaces in contact, rather than linear contact, which increases the trustee contact area. The pipe can withstand greater shear pressure, and thin-walled pipes are not easily deformed when being sheared; it can also improve the stability of the pipe 001 on the trustee surface 111, ensuring that the cross section of the pipe is straighter when shearing.
[0037] In some embodiments, the expression of the quadratic curve is y=ax 2 When the cross-sectional curve expression of the host surface 111 satisfies the above quadratic curve, it can better match the shape of the pipe. The host surface of appropriate size can be designed according to the diameter of the pipe 001 to meet Figure 3 The pipe 001 can be fixed stably by the contact of the two arc surfaces.
[0038] It should be noted that the value of a in the expression of the quadratic curve is calculated as follows: When designing a pipe shear, some parameters must be determined first, such as the shearing range of the designed pipe shear. For example, if the pipe is sheared in the specification range of 16mm to 25mm, the size of the curve opening can be determined. If the curve opening is 27mm and the curve depth Y is 20, the coordinates of the two points (-13.5, 20) and (13.5, 20) can be determined and substituted into y=ax 2 Formula, calculate the value of a. You can continuously adjust the size on the computer until the 25mm tube and the 16mm tube are tangent to the curve at two surfaces. You can also use computer-aided design, the calculation process is simpler, just click the curve command, export the curve, and then cut the pipe in the specification range of 16mm-25mm, determine the opening of 27mm, and adjust the curve.
[0039] It should be noted that, holding the tube shears 100, the tube 001 is placed on the trustee surface 111. When the shearing starts, when the blade 130 of the tube shears 100 cuts and presses the tube 001, the tube 001 is pressed on the trustee surface 111, and the quadratic curve trustee surface 111 will automatically correct the positioning of the tube 001. Then, shearing is performed with force, and the blade 130 cuts in until the tube 001 is cut. Since the positioning of the tube 001 on the quadratic curve trustee surface is relatively stable, the cut surface of the tube 001 is relatively straight.
[0040] Furthermore, the movable handle 120 is rotatably connected to the blade holder 110 . When the movable handle 120 is gripped, cutting is performed using the blade 130 , and when the movable handle 120 is released, the cutting operation stops.
[0041] In some embodiments, please combine Figure 4 and Figure 5 The knife holder 110 is provided with a mounting opening 112, one end of the blade 130 is fixed to the movable handle 120, and the other end of the blade 130 extends out from the mounting opening 112. The knife holder 110 and the blade 130 form a cross structure, and the cutting process is easy to operate. The holding surface 111 on the knife holder 110 is provided with a cutting slit 113 that matches the blade 130, and the cutting slit 113 is connected to the mounting opening 112. During the cutting process, when the blade 130 cuts through the pipe, it can fall into the cutting slit 113.
[0042] Specifically, the two sides of the cutting slit 113 can be symmetrically arranged, and the cutting slit 113 is connected to the installation opening 112 to form a space for the blade to move. The width of the installation opening 112 can be substantially the same as that of the cutting slit 113, or slightly wider than that of the cutting slit 113.
[0043] In some embodiments, the movable handle 120 and the tool holder 110 can be rotatably connected by the rotating shaft 140, and the movable handle 120 and the tool holder 110 form a set of rotating hinge branches through the rotating shaft 140. Force is applied to the set of hinge branches to achieve the purpose of shearing.
[0044] The tool holder 110, the movable handle 120 and the blade 130 are respectively provided with a first rotating hole 114, a second rotating hole 121 and a third rotating hole (not shown in the figure). The second rotating hole 121 on the movable handle 120 and the third rotating hole on the blade 130 correspond in position, that is, after fixing the blade 130, the positions of the second rotating hole 121 and the third rotating hole coincide, and the rotating shaft 140 passes through the first rotating hole 114, the second rotating hole 121 and the third rotating hole to realize the rotating connection between the movable handle 120 and the tool holder 110.
[0045] During use, after the movable handle 120 is gripped, the movable handle 120 and the blade holder 110 are rotated around the rotating shaft 140 , with their ends approaching each other, and the blade 130 cuts the pipe 001 located on the hosting surface 111 .
[0046] In some embodiments, an elastic member 160 is further included, one end of the elastic member 160 is connected to the blade holder 110, and the other end of the elastic member 160 is connected to the movable handle 120. The elastic member provides a restoring force for easy use. When the movable handle 120 is tightened, the elastic member 160 contracts, causing the movable handle 120 and the blade holder 110 to rotate around the rotating shaft 140, with their ends approaching each other, and the blade 130 cutting the pipe 001 located on the hosting surface 111; when the movable handle 120 is loosened, the elastic member 160 is reset, causing the ends of the movable handle 120 and the blade holder 110 to move away from each other.
[0047] Specifically, the elastic member 160 may be a general spring, but is not limited thereto.
[0048] In some embodiments, a lock 170 is further included, which is disposed at one end of the blade holder 110 away from the hosting surface 111. The lock 170 is used to lock the ends of the blade holder 110 and the movable handle 120 when not in use. When not in use, the movable handle 120 and the ends of the blade holder 110 are tightened, and the lock 170 is used to lock the ends of the blade holder 110 and the movable handle 120, so that the blade 130 is retracted and in a closed safety state.
[0049] Specifically, the lock buckle 170 can be hook-shaped and can cover the end of the movable handle 120. The size of the lock buckle 170 matches the size of the end of the movable handle 120. The material of the lock buckle 170 is not limited, and can be stainless steel, alloy, or elastic materials such as silicone.
[0050] like Figure 5 As shown, a mounting groove 122 is provided at the end of the movable handle 120, one end of the blade 130 extends into the mounting groove 122 and is fixedly connected to the movable handle 120, and second rotation holes 121 are provided on the wall surfaces on both sides of the mounting groove 122. In other words, the blade 130 is inserted into the mounting groove 122, and the third rotation hole on the blade 130 coincides with the two second rotation holes 121 on both sides of the mounting groove 122. By using the rotating shaft 140 passing through the two second rotation holes 121 and the third rotation hole, the stability of the installation can be improved, and during the rotation process, the blade 130 rotates together with the movable handle 120.
[0051] In some embodiments, one end of the blade 130 is fixed to the movable handle 120 by a screw 150, that is, both the blade 130 and the movable handle 120 are provided with threaded holes matching the screw 150, so as to facilitate the fixation of the blade 130 and the movable handle 120 by the screw 150.
[0052] The working process of the pipe shear 100 is as follows: (1) The operator holds the pipe cutter holder 110 and the movable handle 120 with one hand, and holds the pipe 001 with the other hand, and places the pipe 001 on the holding surface 111 of the cutter holder 110. (2) Slowly shake the hand to tighten the movable handle 120. As the movable handle 120 tightens, the blade 130 cuts into the pipe until the blade 130 cuts through the pipe 001. (3) Relax the movable handle 120, and the elastic member 160 opens the movable handle 120 for the second shearing. (4) When finishing work, tighten the movable handle 120 and buckle the lock buckle 170, and the blade 130 is in a closed safety state.
[0053] The embodiment of the utility model also provides a pipe installation device, including the above-mentioned pipe cutter 100, and can also include other connecting structures of the pipe to form a complete set of pipe installation devices, which are used for laying water supply pipes in engineering projects or home decoration.
[0054] It should be noted that the improvement of the pipe cutter 100 can make the installation process smoother, prevent the problem of the pipe position not being fixed affecting the cutting effect, and also avoid the deformation of the pipe due to excessive shear force of the pipe holder on the pipe to a certain extent.
[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A pipe shear, characterized in that: It comprises a knife holder and a movable handle, a blade is mounted on the movable handle, the movable handle is rotatably connected to the knife holder, and the end of the knife holder is provided with a hosting surface facing the blade; The cross section of the hosting surface along the cutting direction is a curve shape, and the curve shape satisfies a quadratic curve.
2. The pipe shears according to claim 1, characterized in that: The expression of the quadratic curve is y=ax 2 .
3. The pipe shears according to claim 2, characterized in that: The knife holder is provided with a mounting opening, one end of the blade is fixed to the movable handle, and the other end of the blade extends out from the mounting opening.
4. The pipe shears according to claim 3, characterized in that: The hosting surface on the tool holder is provided with a cutting slit matched with the blade, and the cutting slit is communicated with the mounting opening.
5. The pipe shears according to claim 3, characterized in that: It also includes a rotating shaft, and the tool holder, the movable handle and the blade are respectively provided with a first rotating hole, a second rotating hole and a third rotating hole, the second rotating hole on the movable handle and the third rotating hole on the blade are positioned correspondingly, and the rotating shaft passes through the first rotating hole, the second rotating hole and the third rotating hole to realize the rotating connection between the movable handle and the tool holder.
6. The pipe shears according to claim 5, characterized in that: A mounting groove is arranged at the end of the movable handle, one end of the blade extends into the mounting groove and is fixedly connected to the movable handle, and the second rotating holes are arranged on the wall surfaces on both sides of the mounting groove.
7. The pipe shears according to claim 5, characterized in that: One end of the blade is fixed to the movable handle via a screw.
8. The pipe shears according to claim 1, characterized in that: It also includes an elastic member, one end of which is connected to the knife holder, and the other end of which is connected to the movable handle; When the movable handle is tightened, the elastic member contracts; when the movable handle is loosened, the elastic member returns to its original position.
9. The pipe shears according to claim 1, characterized in that: It also includes a lock buckle, which is arranged at one end of the tool holder away from the hosting surface, and is used to lock the tool holder and the end of the movable handle when not in operation.
10. A pipe installation device, characterized in that: The invention comprises the pipe shears according to any one of claims 1 to 9.