Pipe drawing wrench for cast pipe centrifugal machine

Abstract

The utility model relates to the technical field of cast pipe production equipment, in particular to a pipe drawing wrench for a cast pipe centrifugal machine, which comprises a wrench core, a wrench shaft and a tubular wrench body, a plurality of penetrating grooves are arranged on the outer wall of the wrench body along the circumferential direction of the wrench body, the penetrating grooves are communicated with an inner cavity of the wrench body, and the wrench shaft is connected with the wrench core along the axial direction of the wrench body. One end, connected with the clamp shaft, of the clamp core is a connecting end, the other end of the clamp core is a free end, the outer diameter of the clamp core is gradually increased from the free end to the connecting end, a plurality of guide grooves are formed in the outer wall of the clamp core in the circumferential direction of the clamp core, and the guide grooves penetrate through the end faces of the two opposite ends of the clamp core in the taper direction of the clamp core. Each guide groove is matched with a clamp block in a sliding mode, and each clamp block extends out of the corresponding penetrating-out groove under pushing of the clamp core. When the clamp block needs to be replaced, only the clamp shaft needs to be driven to axially move in the direction in which the outer diameter of the clamp core is gradually enlarged, so that the clamp block is separated from the guide groove, and the clamp block can fall into the tubular clamp body, and the clamp body is convenient to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of casting pipe production equipment, in particular to a pipe pulling pliers for a pipe casting centrifuge. Background Art

[0002] Centrifugal casting is a technology and method in which liquid metal is injected into a mold of a high-speed rotating centrifuge, and the metal liquid makes a centrifugal motion to fill the mold to form a casting. After the pipe casting is formed, it is necessary to pull out the pipe casting from the centrifuge and place it on a pipe rack for cooling. This process is usually completed by using pipe pulling pliers.

[0003] At present, the existing pipe pulling pliers usually adopt pipe pulling pliers in the form of a conical slider. For example, a pipe pulling pliers of a centrifugal pipe casting machine disclosed in a Chinese patent (publication number: CN211135455U). When this pipe pulling pliers is in use, it moves in the direction of the pliers head through the pliers shaft, and at the same time drives the pliers core to move in the direction of the pliers head, so that the pliers core pushes the pliers block to open and clamp the inner wall of the pipe fitting to realize the pipe pulling function. However, since the head of the pliers block is always embedded in the pliers head, it is difficult to remove the pliers block from the pliers core for replacement after the pliers block is worn, which affects the pipe pulling efficiency. Summary of the Utility Model

[0004] One of the main purposes of the present utility model is to provide a pipe pulling device for a pipe casting centrifuge, aiming to solve the technical problem that it is difficult to remove the pliers block from the pliers core for replacement after the existing pliers block is worn.

[0005] To achieve the above purpose, the present utility model provides a pipe pulling pliers for a pipe casting centrifuge, which includes a pliers core, a pliers shaft and a tubular pliers body. A plurality of through slots are arranged on the outer wall of the pliers body along its circumferential direction, the through slots communicate with the inner cavity of the pliers body, the through slots extend along the axial direction of the pliers body, the pliers shaft is axially connected with the pliers core along the pliers body, the pliers shaft is used to drive the pliers core to slide axially in the pliers body along the pliers body, one end of the pliers core connected to the pliers shaft is a connection end, and the other end is a free end. The outer diameter of the pliers core gradually increases from the free end to the connection end. A plurality of guiding slots are arranged on the outer wall of the pliers core along its circumferential direction, the guiding slots penetrate through the end faces of the opposite ends of the pliers core along the taper direction of the pliers core, and each guiding slot is slidably fitted with a pliers block. Each pliers block extends out of or retracts into each through slot under the push of the pliers core.

[0006] Further, the pliers block includes a pliers block body, an inclined portion is provided on the surface of the pliers block body facing the pliers core, the slope of the inclined portion is the same as the slope of the guiding slot, the pliers block body is slidably fitted with the guiding slot through the inclined portion, the cross section of the inclined portion is a T-shaped structure, and the cross section of the guiding slot is a T-shaped structure.

[0007] Furthermore, the angle between the inclined portion or the guide groove and the horizontal central axis of the clamp shaft is 5.5-6.5°.

[0008] Furthermore, the surface of the clamp block body is set to be an arc surface, and the arc surface is provided with a plurality of metal anti-sliding blocks for pressing against the inner wall of the cast pipe or pipe mold to be pulled out, and the curvature of the arc surface is the same as the curvature of the arc surface corresponding to the cast pipe, or the curvature of the arc surface is the same as the curvature of the arc surface corresponding to the pipe mold.

[0009] Furthermore, a plurality of mounting holes are formed on the arc surface, and the plurality of mounting holes correspond one-to-one to the plurality of metal anti-sliding blocks, and each of the metal anti-sliding blocks is connected and fixed to each of the mounting holes.

[0010] Furthermore, the metal anti-slip portion includes an integrally connected metal block body and an anti-slip portion, the metal block body is connected and fixed to the arc surface, the anti-slip portion is fixed on the surface of the metal block body facing away from the clamp block body, and the anti-slip portion is used to contact the inner wall of the cast pipe or pipe mold.

[0011] Furthermore, the anti-slip portion comprises an arc-shaped sawtooth bar, and the curvature of the arc-shaped sawtooth bar is the same as the curvature of the inner wall of the casting pipe or the pipe mold corresponding to the arc-shaped sawtooth bar.

[0012] Furthermore, a plurality of arc-shaped sawtooth bars are provided, and the plurality of arc-shaped sawtooth bars are arranged at intervals along a horizontal direction perpendicular to the clamp axis.

[0013] Furthermore, the heights of the two opposite ends of the clamp block body are different, the surface of the clamp block body facing away from the clamp core is an arc surface that can fit with the inner wall of the cast pipe or the pipe mold, and an avoidance groove that passes through the end face of the free end is provided on the outer wall surface of the clamp core at a position corresponding to the guide groove, and the avoidance groove does not pass through the end face of the connecting end.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] When the pipe pulling pliers of the utility model are used for pipe pulling, the pipe pliers are inserted as a whole into the cast pipe to be pulled out, and the pliers core is driven by the pliers shaft to slide axially inwardly in the pliers body along the direction in which the outer diameter of the pliers core gradually decreases, so that the pliers core pushes each pliers block to open (the pliers block is stretched open) and tightens the inner wall of the cast pipe. At this time, the pipe pulling pliers are pulled axially as a whole in the direction in which the outer diameter of the pliers core gradually increases, so that the cast pipe can be pulled out from the pipe mold of the centrifugal main machine, and the pipe pulling function is realized; when the pliers block is worn and needs to be replaced, it is only necessary to drive the pliers shaft to move axially along the direction in which the outer diameter of the pliers core gradually increases, so that the pliers block is separated from the guide groove, so that the pliers block can fall into the tubular pliers body, and at this time, the pliers block can be taken out of the pliers body to replace the pliers body, thereby improving the pipe pulling efficiency of the pipe pulling pliers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of a pipe extraction forceps according to an embodiment of the utility model;

[0017] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0018] Figure 3 This is a schematic diagram of the structure of the pipe pulling forceps according to an embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the clamp body according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of another angle structure of the pliers body according to an embodiment of the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the pliers core according to an embodiment of the utility model;

[0022] Figure 7 This is a cross-sectional view of a pliers core according to an embodiment of the utility model;

[0023] Figure 8 This is a schematic diagram of the structure of the clamp block body according to an embodiment of the utility model;

[0024] Figure 9 This is a cross-sectional view of a clamp block body according to an embodiment of the utility model;

[0025] Figure 10 Another perspective structural diagram of the clamp block body according to the embodiment of the utility model;

[0026] Figure 11 The utility model is a schematic structural diagram of a metal anti-sliding block according to an embodiment of the present invention.

[0027] Reference numerals in the accompanying drawings:

[0028] 1. Clamp body; 10. Through slot; 11. Clamp seat; 2. Clamp shaft; 3. Clamp core; 30. Guide slot; 31. Avoidance slot; 32. Free end; 33. Connecting end; 330. Threaded hole; 4. Clamp block; 40. Clamp block body; 401. Inclined portion; 402. Arc surface; 403. Mounting hole; 41. Metal anti-slip block; 410. Metal block body; 411. Anti-slip portion; 412. Arc-shaped serrated strip. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "width", "upper", "lower", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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, and therefore should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", "set" 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, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features in between. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0033] Please refer to Figure 1 - Figure 11 , the present utility model provides a pipe pulling pliers for a cast pipe centrifuge, which includes a pliers body 1, a pliers shaft 2, a pliers core 3 and a plurality of pliers blocks 4.

[0034] Refer to Figure 1 and Figure 3 , the pliers body 1 is a tubular structure, both ends of the pliers body 1 are open ends, a pliers seat 11 is sleeved on the outer wall of one end of the pliers seat 11, and a plurality of through slots 10 are arranged along the circumferential direction of the outer wall of the other end of the pliers body 1. The through slots 10 communicate with the inner cavity of the pliers body 1. The through slots 10 extend along the axial direction of the pliers body 1, and the through slots 10 are waist-shaped slots.

[0035] Exemplarily, the number of the through slots 10 is three, and the three through slots 10 divide the pliers body 1 into three equal parts. Of course, in other embodiments, the number of the through slots 10 can also be set to four, which is not limited herein.

[0036] Refer to Figure 1, the clamping shaft 2 is threadedly connected to the clamping core 3 along the axial direction of the clamping body 1. The clamping shaft 2 is used to drive the clamping core 3 to slide within the clamping body 1 along the axial direction of the clamping body 1. In order to achieve the automatic driving function of the clamping shaft 2, one end of the clamping shaft 2 extends out of the clamping body 1 along the axial direction of the clamping body 1 and is connected to a driving unit (not shown). The driving unit selects existing hydraulic push rods or linear driving modules, etc., for automatically driving the clamping shaft 2 to drive the clamping core 3 to move axially.

[0037] It should be noted that one end of the clamping core 3 connected to the clamping shaft 2 is the connecting end 33, and the other end is the free end 32. A threaded hole 330 is provided on the end face of the connecting end 33 of the clamping core 3, and it is threadedly connected to the thread at one end of the clamping shaft 2 used for connecting to the clamping core 3 through this threaded hole 330, quickly realizing the disassembly and assembly effect of the clamping core 3 and the clamping shaft 2.

[0038] Refer to Figure 1 、 Figure 6 、 Figure 7 , the outer diameter of the clamping core 3 gradually increases from its free end 32 to its connecting end 33. A plurality of guiding grooves 30 are provided on the outer wall of the clamping core 3 along its circumferential direction, and the plurality of guiding grooves 30 correspond to the plurality of clamping blocks 4 one by one. Exemplarily, the number of guiding grooves 30 is also set to three. The guiding grooves 30 penetrate through the end faces of the opposite ends of the clamping core 3 along the taper direction of the clamping core 3; Refer to Figure 1 and Figure 2 , each guiding groove 30 is slidably adapted to each clamping block 4, and each clamping block 4 extends out or retracts through each through groove 10 under the push of the clamping core 3. Refer to Figure 7 , the cross-section of the guiding groove 30 in the horizontal direction perpendicular to the clamping shaft 2 is a T-shaped structure. The included angle between the guiding groove 30 and the horizontal central axis of the clamping shaft is 5.5° - 6.5°. In this embodiment, the included angle between the guiding groove 30 and the horizontal central axis of the clamping shaft is 6°. In other embodiments, the included angle between the guiding groove 30 and the horizontal central axis of the clamping shaft is 5.5° or 6.5°.

[0039] Refer to Figure 1 、 Figure 8 、 Figure 9 、 Figure 10, the clamping block 4 includes a clamping block body 40 and a metal anti-slip block 41. An inclined portion 401 is provided on the surface of the clamping block body 40 facing the clamping core 3. The slope of the inclined portion 401 is the same as the slope of the guiding groove 30. The clamping block body 40 is slidably adapted to the guiding groove 30 through the inclined portion 401. The cross-section of the inclined portion 401 in the horizontal direction perpendicular to the clamping shaft 2 is a T-shaped structure. The surface of the clamping block body 40 is an arc surface 402. The metal anti-slip blocks 41 are arranged on the arc surface 402. There are multiple metal anti-slip blocks 41, and the metal anti-slip blocks 41 are used to press against the inner wall of the cast pipe or pipe mold to be pulled out; the radian of the arc surface 402 is the same as the radian of the corresponding arc surface of the inner wall of the cast pipe, or the radian of the arc surface 402 is the same as the radian of the corresponding arc surface of the inner wall of the pipe mold.

[0040] Specifically, referring to Figure 1 and Figure 8 , a plurality of mounting holes 403 are formed in the arc surface 402. The mounting holes 403 are cylindrical holes; the plurality of mounting holes 403 correspond to the plurality of metal anti-slip blocks 41 one by one, and each metal anti-slip block 41 is fixedly connected to each mounting hole 403. Among them, one end of a metal anti-slip block 41 is inserted into a mounting hole 403, and the metal anti-slip block 41 and the mounting hole 403 can be fixed by an interference fit method.

[0041] Since the radian of the arc surface 402 of the clamping block body 40 is the same as the radian of the corresponding arc surface of the inner wall of the cast pipe or pipe mold, and the slope of the inclined portion 401 on the clamping block body 40 is the same as the slope of the guiding groove 30, the heights of the opposite ends of the clamping block body 40 are different. It can be seen from this that one end of the clamping block body 40 is the small end and the other end is the large end. In order to enable the clamping block 4 to be assembled with the clamping core 3, referring to Figure 6 , avoiding grooves 31 are formed at the positions corresponding to the guiding grooves 30 on the outer wall surface of the clamping core 3. The avoiding grooves 31 penetrate through the end surface of the free end 32 of the clamping core 3, and the avoiding grooves 31 do not penetrate through the end surface of the connecting end 33 of the clamping core 3. When the clamping block 4 and the clamping core 3 are specifically assembled, the inclined portion 401 on the clamping block body 40 is slid along the guiding groove 30 starting from the small end. Since the avoiding groove 31 cuts the thickness of the clamping core 3, during the process of the clamping block 4 sliding along the guiding groove 30, the clamping core 3 will not interfere with the clamping block 4, enabling the clamping block 4 and the clamping core 3 to be smoothly assembled. When the end surface of the small end of the clamping block body 40 slides to align with the end surface of the connecting end 33 of the clamping core 3, the end surface of the large end of the clamping block body 40 aligns with the end surface of the free end 32 of the clamping core 3.

[0042] Referring to Figure 1 , Figure 10 , Figure 11The metal anti-slip block 41 includes a metal block body 410 and an anti-slip portion 411. The metal block body 410 is connected and fixed to the arc surface 402. The structure of the metal block body 410 is a cylindrical structure. The metal block body 410 is interference-fitted into the mounting hole 403 to achieve the connection and fixation between the metal block body 410 and the clamp block 4. Of course, the anti-slip portion 411 is integrally connected to the metal block body 410. The anti-slip portion 411 is fixed on the surface of the metal block body facing away from the clamp block body 40. The anti-slip portion 411 is used to contact the inner wall of the cast pipe or pipe mold, that is, the metal anti-slip block 41 is pushed by the clamp core 3 so that the anti-slip portion 411 tightens the inner wall of the cast pipe or pipe mold. The anti-slip portion 411 includes a serrated bar, such as Figure 11 As shown, the sawtooth bar of this embodiment is arc-shaped, and the curvature of the arc-shaped sawtooth bar 412 is the same as the curvature of the inner wall of the casting pipe or the pipe mold corresponding to the arc-shaped sawtooth bar 412, so that the contact surface between the anti-slip part 411 and the casting pipe can be infinitely close to the inner wall of the casting pipe, avoiding point contact to damage the casting pipe or the pipe mold, thereby avoiding the problem of the casting pipe being cracked. Of course, in other embodiments, the sawtooth bar can also be as follows Figure 1 The straight-line sawtooth strips shown are not limited here.

[0043] Among them, there are multiple arc-shaped sawtooth bars 412, and the multiple arc-shaped sawtooth bars 412 are arranged at intervals along the horizontal direction perpendicular to the clamp axis 2, so as to improve the friction between the anti-slip part 411 and the inner wall of the cast pipe or pipe mold, and avoid the phenomenon that the metal anti-sliding block 41 is separated from the cast pipe or pipe mold when pulling the pipe.

[0044] In summary, the working principle of the utility model is:

[0045] When pulling out the cast pipe, the pipe pulling pliers are inserted into the cast pipe to be pulled out as a whole, and the pliers shaft 2 is driven by the driving unit to drive the pliers core 3 to slide axially inwardly in the pliers body 1 along the direction in which the outer diameter of the pliers core 3 gradually decreases, so that the pliers core 3 pushes each pliers block 4 to open (the pliers block 4 is stretched out) and extends out of the groove 10 to tighten the inner wall of the cast pipe. At this time, the pipe pulling pliers are pulled as a whole in the direction of the pliers seat 11 to move axially, so that the cast pipe can be pulled out of the pipe mold of the centrifugal main machine, and the pipe pulling function is realized; similarly When pulling out the pipe mold of the cast pipe, the pipe pulling pliers are inserted as a whole into the pipe mold to be pulled out, and the pliers shaft 2 is driven by the driving unit to drive the pliers core 3 to slide axially inward in the pliers body 1 along the direction in which the outer diameter of the pliers core 3 gradually decreases, so that the pliers core 3 pushes each pliers block 4 to open (the pliers block 4 is stretched open) and extends out of the groove 10 to tighten the inner wall of the pipe mold. At this time, the pipe pulling pliers are pulled as a whole in the direction of the pliers seat 11 for axial movement, so that the pipe mold can be pulled out of the pipe mold of the centrifugal main machine to realize the pipe pulling function.

[0046] When the clamping block 4 is worn and needs to be replaced, that is, when the pipe wrench is in a non-working state (the non-working state refers to a state other than the pipe extraction operation state), the driving unit is used to drive the clamping shaft 2 to move along the axial direction of the clamping body 1 towards the clamping seat 11, driving the clamping core 3 to axially move towards the clamping seat 11, so that the clamping block 4 retracts into the through groove 10. When the clamping block 4 completely disengages from the guiding groove 30, the clamping block 4 will fall into the tubular clamping body 1. At this time, the clamping block 4 can be taken out of the clamping body 1 to replace the clamping body 1, thus facilitating the replacement of different clamping blocks 4 and improving the pipe extraction efficiency of the pipe wrench.

[0047] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A pipe pulling pliers for a cast pipe centrifuge, comprising a pliers core, a pliers shaft and a tubular pliers body, wherein the outer wall of the pliers body is provided with a plurality of through grooves along its circumference, the through grooves are communicated with the inner cavity of the pliers body, the through grooves extend along the axial direction of the pliers body, the pliers shaft is connected to the pliers core along the axial direction of the pliers body, the pliers shaft is used to drive the pliers core to slide within the pliers body along the axial direction of the pliers body, one end of the pliers core connected to the pliers shaft is a connecting end, and the other end is a free end, characterized in that: The outer diameter of the pliers core gradually increases from the free end to the connecting end, and a plurality of guide grooves are arranged on the outer wall of the pliers core along its own circumference. The guide grooves penetrate the end surfaces of the opposite ends of the pliers core along the taper direction of the pliers core, and the guide grooves are slidably adapted with pliers blocks, and each of the pliers blocks extends out of or retracts into each of the outlet grooves under the push of the pliers core.

2. The pipe pulling pliers for a cast pipe centrifuge according to claim 1, characterized in that: The clamp block includes a clamp block body, and an inclined portion is provided on the surface of the clamp block body facing the clamp core. The inclination of the inclined portion is the same as the inclination of the guide groove. The clamp block body is slidably adapted to the guide groove through the inclined portion. The cross-section of the inclined portion is a T-shaped structure, and the cross-section of the guide groove is a T-shaped structure.

3. The pipe pulling pliers for a cast pipe centrifuge according to claim 2, characterized in that: The angle between the inclined portion or the guide groove and the horizontal central axis of the clamp shaft is 5.5-6.5°.

4. The pipe pulling pliers for a cast pipe centrifuge according to claim 1, characterized in that: The surface of the clamp block body is set as an arc surface, and a plurality of metal anti-slip blocks are provided on the arc surface for pressing against the inner wall of the cast pipe or pipe mold to be pulled out. The curvature of the arc surface is the same as the curvature of the inner wall of the cast pipe corresponding to the arc surface, or the curvature of the arc surface is the same as the curvature of the inner wall of the pipe mold corresponding to the arc surface.

5. The pipe pulling pliers for a cast pipe centrifuge according to claim 4, characterized in that: The arc surface is provided with a plurality of mounting holes, the plurality of mounting holes correspond to the plurality of metal anti-sliding blocks one by one, and each of the metal anti-sliding blocks is connected and fixed to each of the mounting holes.

6. The pipe pulling pliers for a cast pipe centrifuge according to claim 4, characterized in that: The metal anti-slip portion includes an integrally connected metal block body and an anti-slip portion, the metal block body is connected and fixed to the arc surface, the anti-slip portion is fixed on the surface of the metal block body facing away from the clamp block body, and the anti-slip portion is used to contact the inner wall of the cast pipe or pipe mold.

7. The pipe pulling pliers for a cast pipe centrifuge according to claim 6, characterized in that: The anti-slip portion comprises an arc-shaped sawtooth bar, and the curvature of the arc-shaped sawtooth bar is the same as the curvature of the inner wall of the casting pipe or the pipe mold corresponding to the arc-shaped sawtooth bar.

8. The pipe pulling pliers for a cast pipe centrifuge according to claim 7, characterized in that: A plurality of arc-shaped sawtooth bars are provided, and the plurality of arc-shaped sawtooth bars are arranged at intervals along the axial direction of the clamp shaft.

9. The pipe pulling pliers for a cast pipe centrifuge according to claim 2, characterized in that: The heights of the two opposite ends of the clamp block body are different. The surface of the clamp block body facing away from the clamp core is an arc surface that can fit the inner wall of the cast pipe or the pipe mold. An avoidance groove that passes through the end face of the free end is provided on the outer wall surface of the clamp core at a position corresponding to the guide groove, and the avoidance groove does not pass through the end face of the connecting end.

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