Tube plate pull rod hole processing positioning device

Abstract

The application provides a tube plate pull rod hole machining positioning device, and relates to the technical field of hole machining. The tube plate pull rod hole machining positioning device comprises a drilling template and a positioning assembly. The drilling template is provided with a drilling hole penetrating through the drilling template. The positioning assembly is arranged on the drilling template and is used for cooperating with a workpiece to complete positioning between the drilling template and the workpiece. In this way, the positioning assembly is used for completing accurate positioning of the workpiece and the drilling template. Since the drilling template is preformed with a fixed drilling hole position, the drilling hole region of the drilling template can accurately correspond to the to-be-machined region of the workpiece pull rod hole after positioning. Therefore, repeated positioning is not needed, a drilling device can directly complete drilling work through the preformed hole of the drilling template, the hole machining precision is effectively ensured, the clamping and positioning process is simplified, and the machining efficiency of the tube plate pull rod hole is improved.

Description

Technical Field

[0001] This invention relates to the field of hole processing technology, and more specifically, to a positioning device for processing tie rod holes in tube sheets. Background Technology

[0002] Heat exchangers are core heat exchange equipment widely used in the nuclear power and petrochemical industries. Tube sheets are key components of heat exchangers. The tie rod holes on the shell side of the tube sheet are used to assemble and fix the tube sheet to the support plate. To ensure the positional accuracy of the tie rod holes and the heat exchange tube holes, the machining of the tie rod holes is generally completed after the machining of the heat exchange tube holes. At this time, due to the influence of the shell side cylinder section, the machining of the machine tool is limited. Therefore, the industry currently often uses manual scribing and positioning for machining the tie rod holes, and then uses portable equipment to process them.

[0003] However, manual scribing is affected by the operator's experience and operational errors, making it difficult to control the hole position deviation. This will directly lead to alignment errors during subsequent assembly with the support plate, affecting the overall assembly accuracy and operational stability of the heat exchanger. In addition, there are a large number of tie rod holes on the tube sheet, making the alignment process after manual scribing difficult and unable to meet the needs of large-volume, high-precision processing. Summary of the Invention

[0004] The problem solved by this invention is how to improve the accuracy and efficiency of positioning during the machining of tie rod holes in tube sheets.

[0005] To solve the above problems, the present invention provides a tube sheet tie rod hole machining positioning device, including a drilling template and a positioning component. The drilling template has a through hole, and the positioning component is disposed on the drilling template. The positioning component is used to cooperate with the workpiece to complete the positioning between the drilling template and the workpiece, and to connect the drilling hole with the workpiece to be machined area.

[0006] Optionally, it also includes a clamping and fixing component; the clamping and fixing component abuts against the end of the drill template away from the workpiece.

[0007] Optionally, the clamping and fixing assembly includes an installation unit and a clamping unit; the installation unit is connected to the clamping unit and is used to provide an installation base for the clamping unit; the clamping unit abuts against the end of the drill template away from the positioning assembly.

[0008] Optionally, the mounting unit is a magnetic base, which is connected to the clamping unit.

[0009] Optionally, the clamping unit includes a connecting plate connected to the magnetic base, and the connecting plate is provided with a first threaded through hole; a clamping screw is provided in the internal thread of the first threaded through hole; the clamping screw can be moved to abut against the end of the drill template away from the positioning component.

[0010] Optionally, the positioning component includes two positioning pins, which are spaced apart on the drill template and can extend into a preset area of ​​the workpiece to complete the positioning between the drill template and the workpiece.

[0011] Optionally, the two locating pins are a cylindrical pin and a diamond pin, respectively.

[0012] Optionally, it also includes a drill sleeve assembly, which is detachably disposed within the borehole.

[0013] Optionally, the drill bushing assembly includes a drill bushing screw and a quick-change drill bushing. The quick-change drill bushing is partially disposed within the drill hole and fits against the inner wall of the drill hole. The portion of the quick-change drill bushing extending out of the drill hole has a first notch. The drill template has a first threaded blind hole. The drill bushing screw is threaded into the first threaded blind hole. The drill bushing screw abuts against the inner wall of the first notch to cooperate with the drill template to fix the quick-change drill bushing.

[0014] Optionally, the end of the drill template away from the positioning pin is provided with a plurality of second threaded blind holes, and the inner threads of the second threaded blind holes are provided with eye bolts.

[0015] The beneficial effects of the tube sheet tie rod hole machining and positioning device of the present invention are: The positioning components enable precise positioning of the workpiece and the drilling template. Since the pre-drilled holes in the drilling template are fixed, the drilling area can accurately correspond to the workpiece tie rod hole processing area after positioning, eliminating the need for repeated alignment. The drilling device can directly complete the drilling operation through the pre-drilled holes in the drilling template, effectively ensuring the hole processing accuracy, simplifying the clamping and alignment process, and improving the processing efficiency of the tube sheet tie rod hole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the tube sheet tie rod hole machining and positioning device in an embodiment of the present invention.

[0017] Figure 2 This is a top view of the tube sheet tie rod hole machining and positioning device in an embodiment of the present invention.

[0018] Figure 3 This is a side view of the drilling template in the tube sheet tie rod hole machining positioning device in an embodiment of the present invention.

[0019] Figure 4 This is a front view of the clamping and fixing component in the tube sheet tie rod hole machining and positioning device in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Drill template; 2. Magnetic base; 3. Connecting plate; 4. Clamping screw; 5. Locating pin; 6. Quick-change drill sleeve; 7. Drill sleeve screw; 8. Lifting eye bolt. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0022] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0023] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0024] In related technologies, heat exchangers are core heat exchange equipment widely used in the nuclear power and petrochemical industries. Among them, tube sheets are key components of heat exchanger equipment. The tie rod holes on the shell side of the tube sheet are used to assemble and fix the tube sheet to the support plate. To ensure the positional accuracy of the tie rod holes and the heat exchange tube holes, the machining of the tie rod holes is generally completed after the machining of the heat exchange tube holes. At this time, due to the influence of the shell side cylinder section, the machining of the machine tool is limited. Therefore, the industry currently often uses manual scribing and positioning to machine the tie rod holes, and then uses portable equipment to process them.

[0025] However, manual marking is affected by operator experience and operational errors, making it difficult to control hole position deviations. This directly leads to alignment errors during subsequent assembly with the support plate, affecting the overall assembly accuracy and operational stability of the heat exchanger. Furthermore, the large number of tie rod holes on the tube sheet makes the alignment process after manual marking difficult, failing to meet the requirements of large-volume, high-precision processing. To address the problems existing in the aforementioned related technologies, this embodiment provides a tube sheet tie rod hole machining and positioning device.

[0026] like Figure 1-4As shown in the figure, an embodiment of the present invention provides a tube sheet tie rod hole machining positioning device, including a drilling template 1 and a positioning component. The drilling template 1 is provided with a through hole, and the positioning component is disposed on the drilling template 1. The positioning component is used to cooperate with the workpiece to complete the positioning between the drilling template 1 and the workpiece, and to connect the drilling hole with the workpiece to be machined area.

[0027] Specifically, the positioning component is set at the end of the drill template 1 facing the workpiece, and the position of the drill hole will not change after the drill hole is opened on the drill template 1. That is, after the positioning component completes the positioning between the workpiece and the drill template 1, the position of the drill hole will also be determined. That is, the positioning component positions the drill template 1 and the workpiece so that when the drill template 1 is positioned on the workpiece, the area where the drill hole is opened on the drill template 1 is mapped onto the workpiece and is exactly the area to be processed on the workpiece. Thus, the drilling device can directly pass through the drill hole to complete the drilling operation on the workpiece.

[0028] In this embodiment, when the device is in use, drilling holes are made in the drilling template 1, and then the positioning component is used to position the drilling template 1 and the workpiece. That is, the drilling holes in the drilling template 1 are used to position the area of ​​the workpiece to be processed. After the positioning component is used to position the drilling template 1 and the workpiece, the drilling device can pass through the drilling holes to complete the drilling operation on the workpiece. The device achieves precise positioning of the workpiece and the drilling template 1 through the positioning component. Since the pre-drilled hole position of the drilling template 1 is fixed, after positioning, its drilling area can accurately correspond to the area of ​​the tie rod hole to be processed on the workpiece, without the need for repeated alignment. The drilling device can directly complete the drilling operation through the pre-drilled hole of the drilling template 1, effectively ensuring the hole processing accuracy, simplifying the clamping and alignment process, and improving the processing efficiency of the tie rod hole of the tube sheet.

[0029] Optionally, it also includes a clamping and fixing component; the clamping and fixing component abuts against the end of the drill template 1 away from the workpiece.

[0030] Specifically, the clamping and fixing components are installed according to the environment, and are installed after the drill template 1 is positioned. Thus, when the clamping and fixing components are used, the drill template 1 is already positioned. That is, during the positioning process of the drill template 1, the clamping and fixing components will not obstruct the positioning of the drill template 1. The clamping and fixing components abut against the end of the drill template 1 away from the workpiece. That is, when the clamping and fixing components abut against the drill template 1, the drill template 1 is located between the clamping and fixing components and the workpiece. The clamping and fixing components can apply pressure to the side of the drill template 1 facing the workpiece, thereby squeezing and fixing the drill template 1 to the workpiece. Multiple clamping and fixing components can be set, and multiple clamping and fixing components can be placed in different positions, thereby completing the clamping and fixing operation of the drill template 1 from all directions.

[0031] In this optional embodiment, after the drill template 1 is positioned with the workpiece, the clamping and fixing component is installed. The clamping and fixing component can be installed according to the working environment. It is only necessary to ensure that the clamping and fixing component can abut against the end of the drill template 1 away from the workpiece. This device enhances the assembly stability between the drill template 1 and the workpiece by clamping and fixing the component. That is, when the drilling device processes the workpiece along the drill hole on the drill template 1, it can effectively prevent the drill template 1 from shifting relative to the workpiece, avoid the problem of the drilling position deviating and the processing point shifting due to the offset of the drill template 1, and ensure the processing accuracy and positioning consistency of the workpiece drilling.

[0032] Optionally, the clamping and fixing assembly includes an installation unit and a clamping unit; the installation unit is connected to the clamping unit and is used to provide an installation base for the clamping unit; the clamping unit abuts against the end of the drill template 1 away from the positioning assembly.

[0033] Specifically, the clamping unit is connected to the installation unit. The clamping unit can be installed and fixed simultaneously by assembling the installation unit into place. The installation position of the installation unit is determined according to the usage requirements, which is sufficient to ensure that the clamping unit can abut against the end of the drill template 1 away from the workpiece. By abutting against the drill template 1, the installation unit can provide a stable working support for the clamping unit after assembly, which facilitates the clamping assembly to reliably clamp the drill template 1 and the workpiece, and further improves the tightness of the assembly between the drill template 1 and the workpiece.

[0034] For example, when the workpiece and the drill template 1 are set on the machine tool, the mounting unit can also be mounted on the machine tool, and the drill template 1 and the workpiece are pressed by the clamping unit to fix the drill template 1 and the workpiece on the machine tool.

[0035] In this optional embodiment, by completing the installation of the mounting unit, the clamping unit connected to the mounting unit is installed. After the clamping unit obtains a stable working support, it can effectively abut against the drill template 1, thereby pushing the drill template 1 toward the workpiece to improve the assembly stability between the drill template 1 and the workpiece.

[0036] Optionally, the mounting unit is a magnetic base 2, which is connected to the clamping unit.

[0037] Specifically, the magnetic base 2 is equipped with an electromagnet. The magnetic base 2 and the clamping unit are installed by bolts. The magnetic base 2 can be placed on an object in the surrounding environment that can generate an attraction force with the electromagnet, or the magnetic base 2 can be placed at any position on the tube sheet (i.e., the workpiece) (as long as the clamping unit can abut against the end of the drill template 1 away from the workpiece). The installation can be completed by energizing the magnetic base 2.

[0038] In this optional embodiment, the installation of the magnetic base 2 can be completed by placing it on any structure that can generate an attractive force with the electromagnet and energizing it. This completes the installation of the clamping unit. Since the tube sheet can generate an attractive force with the electromagnet, the magnetic base 2 can be placed at any position on the tube sheet, i.e., the workpiece, so that the clamping unit can abut against the end of the drill template 1 away from the workpiece. This completes the installation of the clamping and fixing assembly, thereby expanding the applicability of the clamping and fixing assembly.

[0039] Optionally, the clamping unit includes a connecting plate 3, which is connected to the magnetic base 2. The connecting plate 3 has a first threaded through hole. A clamping screw 4 is threaded inside the first threaded through hole. The clamping screw 4 can be moved to abut against the end of the drill template 1 that is away from the positioning component.

[0040] Specifically, the connecting plate 3 and the magnetic base 2 are connected by bolts, and the connecting plate 3 is provided with a first threaded through hole. The clamping screw 4 is threaded in the first threaded through hole, and the clamping screw 4 is threadedly connected to the connecting plate 3. That is, when the clamping screw 4 is rotated, the clamping screw 4 and the connecting plate 3 can move relative to each other. When installing the magnetic base 2, the connecting plate 3 installed with the magnetic base 2 needs to be kept above the drill template 1. After the magnetic base 2 is installed, the clamping screw 4 is rotated, and the clamping screw 4 moves and abuts against the end of the drill template 1 away from the workpiece.

[0041] In this optional embodiment, by rotating the clamping screw 4, which is threadedly connected to the connecting plate 3, the clamping screw 4 moves relative to the connecting plate 3 when rotating. By rotating the clamping screw 4 to make it abut against the drill template 1, the clamping and fixing of the drill template 1 can be completed.

[0042] Optionally, the positioning component includes two positioning pins 5, which are spaced apart on the drill template 1. The two positioning pins 5 can extend into a preset area of ​​the workpiece to complete the positioning between the drill template 1 and the workpiece.

[0043] Specifically, since the workpiece is being machined to form the tube sheet tie rod holes, and the heat exchange tube holes on the tube sheet to be machined have already been machined, when the positioning mechanism is used to cooperate with the workpiece, the positioning component can be used to cooperate with the heat exchange tube holes on the workpiece. That is, the positioning pin 5 is inserted into the pre-machined heat exchange tube holes on the tube sheet, and the positioning pin 5 slides against the inner wall of the heat exchange tube hole. In this way, the positioning pin 5 cannot move radially within the heat exchange tube hole, thereby achieving accurate positioning of the drilling template 1 and the area to be machined on the tube sheet, and preventing relative movement.

[0044] In this optional embodiment, by inserting two positioning pins 5 into different heat exchange tube holes on the tube sheet, the heat exchange tube hole into which the positioning pin 5 is inserted needs to be selected according to the position of the tie rod hole to be processed during positioning. When the two positioning pins 5 are inserted into two different heat exchange tube holes, there is no relative movement between the drill template 1 and the tube sheet, thus completing the positioning of the drill template 1 and the drill hole. Since no other operation is required during positioning, it is only necessary to insert the positioning pin 5 into the heat exchange tube hole. Therefore, the positioning operation of this device is simple and does not require any extra operations such as measurement. The operation speed is fast. Since the tie rod hole can be processed immediately after positioning, the processing efficiency of the tube sheet tie rod hole can be improved.

[0045] Optionally, the two positioning pins 5 are a cylindrical pin and a diamond pin, respectively.

[0046] In this optional embodiment, when the cylindrical pin and the diamond pin are respectively engaged with the heat exchange tube holes of the tube sheet, the cylindrical pin is used to position the reference center and completely fix the reference center. Under the action of the diamond pin, the error of the workpiece processing can be compensated and over-positioning interference can be avoided. It is only necessary to restrict the rotational degree of freedom of the drill template 1 around the cylindrical pin by the diamond pin.

[0047] Optionally, it also includes a drill sleeve assembly, which is detachably disposed within the borehole.

[0048] Specifically, hole machining requires sequential processing, namely, center drilling, small drill bit drilling, reaming, boring, and other processes. The diameter of the cutting tool used in each process is different. The detachable drill bushing assembly can be available in various models. The outer diameter of the drill bushing is the same for all models, but the inner diameter is different. Thus, by using the detachable drill bushing assembly, the drill bushing assembly that matches the cutting tool used in different processes can be selectively replaced.

[0049] In this optional embodiment, by replacing the drill bushing assembly, the matching drill bushing can be flexibly replaced according to the cutting tools used in each hole machining process, accurately guiding the cutting tools and effectively ensuring the machining accuracy of each process and the coaxiality and perpendicularity of the hole position.

[0050] Optionally, the drill bushing assembly includes a drill bushing screw 7 and a quick-change drill bushing 6. The quick-change drill bushing 6 is partially disposed inside the drill hole and fits against the inner wall of the drill hole. The portion of the quick-change drill bushing 6 extending out of the drill hole is provided with a first notch. The drill template 1 is provided with a first threaded blind hole. The drill bushing screw 7 is threaded into the first threaded blind hole. The drill bushing screw 7 abuts against the inner wall of the first notch to cooperate with the drill template 1 to fix the quick-change drill bushing 6.

[0051] Specifically, the outer diameter of the quick-change drill sleeve matches the inner diameter of the drill hole, and the annular shoulder extending out of the drill hole from the quick-change drill sleeve is larger than the diameter of the drill hole. The first notch is set on the shoulder of the quick-change drill sleeve located outside the drill hole. The drill sleeve screw 7 is threaded and rotated in the first threaded blind hole. The projection of the drill sleeve screw in the vertical direction coincides with the projection of the shoulder in the vertical direction. That is, when the screw enters the first threaded blind hole, it can move to abut against the inner wall of the first notch to cooperate with the drill template 1 to complete the clamping and limiting of the shoulder, thereby completing the limiting of the quick-change drill sleeve.

[0052] In this optional embodiment, when it is necessary to install the quick-change drill bushing, simply insert the quick-change drill bushing into the drill hole and make the upper end of the quick-change drill bushing fit against the drill template 1. Insert the drill bushing screw into the first threaded blind hole. When the drill bushing screw rotates, it abuts against the inner wall of the first notch, thereby cooperating with the drill template 1 to complete the fixation of the quick-change drill bushing. When it is necessary to disassemble the quick-change drill bushing, simply pull the drill bushing screw out of the first threaded blind hole to remove the quick-change drill bushing from the drill hole for replacement. Moreover, the replacement operation of the quick-change drill bushing is also very simple. That is, when different processes are performed on the face hole, the quick-change drill bushing 6 can also be replaced as needed.

[0053] Optionally, the drill template 1 is characterized by having a plurality of second threaded blind holes at one end away from the positioning pin 5, and the second threaded blind holes are provided with eye bolts 8 by internal threads.

[0054] In this embodiment, the drill template 1 is threaded with a lifting eye bolt 8. The lifting eye of the lifting eye bolt 8 is easy for the operator to hold. When it is necessary to move or transport the drill template 1, the operator can hold the lifting eye and easily complete the relocation, disassembly and transportation of the drill template 1.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A positioning device for machining tie rod holes in a tube sheet, characterized in that, It includes a drill template (1) and a positioning component. The drill template (1) has a through hole. The positioning component is disposed on the drill template (1). The positioning component is used to cooperate with the workpiece to complete the positioning between the drill template (1) and the workpiece, and to connect the drill hole with the workpiece to be processed area.

2. The tube sheet tie rod hole machining and positioning device according to claim 1, characterized in that, It also includes a clamping and fixing component; the clamping and fixing component abuts against the end of the drill template (1) away from the workpiece.

3. The tube sheet tie rod hole machining and positioning device according to claim 2, characterized in that, The clamping and fixing assembly includes an installation unit and a clamping unit; the installation unit is connected to the clamping unit and is used to provide an installation base for the clamping unit; the clamping unit abuts against the end of the drill template (1) away from the positioning assembly.

4. The tube sheet tie rod hole machining and positioning device according to claim 3, characterized in that, The installation unit is a magnetic base (2), which is connected to the clamping unit.

5. The tube sheet tie rod hole machining and positioning device according to claim 4, characterized in that, The clamping unit includes a connecting plate (3), which is connected to the magnetic base (2). The connecting plate (3) is provided with a first threaded through hole. A clamping screw (4) is provided in the threaded through hole. The clamping screw (4) can be moved to abut against the end of the drill template (1) away from the positioning component.

6. The tube sheet tie rod hole machining and positioning device according to claim 1, characterized in that, The positioning component includes two positioning pins (5), which are spaced apart on the drill template (1). The two positioning pins (5) can extend into a preset area of ​​the workpiece to complete the positioning between the drill template (1) and the workpiece.

7. The tube sheet tie rod hole machining and positioning device according to claim 6, characterized in that, The two positioning pins (5) are a cylindrical pin and a diamond pin, respectively.

8. The tube sheet tie rod hole machining and positioning device according to claim 1, characterized in that, It also includes a drill bushing assembly, which is detachably disposed within the borehole.

9. The tube sheet tie rod hole machining and positioning device according to claim 8, characterized in that, The drill bushing assembly includes a drill bushing screw (7) and a quick-change drill bushing (6). The quick-change drill bushing (6) is partially disposed inside the drill hole and fits against the inner wall of the drill hole. The portion of the quick-change drill bushing (6) extending out of the drill hole is provided with a first notch. The drill template (1) is provided with a first threaded blind hole. The drill bushing screw (7) is threaded into the first threaded blind hole. The drill bushing screw (7) abuts against the inner wall of the first notch to cooperate with the drill template (1) to fix the quick-change drill bushing (6).

10. The tube sheet tie rod hole machining and positioning device according to claim 6, characterized in that, The drill template (1) has multiple second thread blind holes at one end away from the positioning pin (5), and the second thread blind holes are provided with eye bolts (8) in their internal threads.

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